+++ /dev/null
-
-
-0.9.0
-~~~~~
-First version.
-
-
-0.9.0a
-~~~~~~
-Removed 'ranlib' from Makefile, since most modern Unix-es
-don't need it, or even know about it.
-
-
-0.9.0b
-~~~~~~
-Fixed a problem with error reporting in bzip2.c. This does not effect
-the library in any way. Problem is: versions 0.9.0 and 0.9.0a (of the
-program proper) compress and decompress correctly, but give misleading
-error messages (internal panics) when an I/O error occurs, instead of
-reporting the problem correctly. This shouldn't give any data loss
-(as far as I can see), but is confusing.
-
-Made the inline declarations disappear for non-GCC compilers.
-
-
-0.9.0c
-~~~~~~
-Fixed some problems in the library pertaining to some boundary cases.
-This makes the library behave more correctly in those situations. The
-fixes apply only to features (calls and parameters) not used by
-bzip2.c, so the non-fixedness of them in previous versions has no
-effect on reliability of bzip2.c.
-
-In bzlib.c:
- * made zero-length BZ_FLUSH work correctly in bzCompress().
- * fixed bzWrite/bzRead to ignore zero-length requests.
- * fixed bzread to correctly handle read requests after EOF.
- * wrong parameter order in call to bzDecompressInit in
- bzBuffToBuffDecompress. Fixed.
-
-In compress.c:
- * changed setting of nGroups in sendMTFValues() so as to
- do a bit better on small files. This _does_ effect
- bzip2.c.
-
-
-0.9.5a
-~~~~~~
-Major change: add a fallback sorting algorithm (blocksort.c)
-to give reasonable behaviour even for very repetitive inputs.
-Nuked --repetitive-best and --repetitive-fast since they are
-no longer useful.
-
-Minor changes: mostly a whole bunch of small changes/
-bugfixes in the driver (bzip2.c). Changes pertaining to the
-user interface are:
-
- allow decompression of symlink'd files to stdout
- decompress/test files even without .bz2 extension
- give more accurate error messages for I/O errors
- when compressing/decompressing to stdout, don't catch control-C
- read flags from BZIP2 and BZIP environment variables
- decline to break hard links to a file unless forced with -f
- allow -c flag even with no filenames
- preserve file ownerships as far as possible
- make -s -1 give the expected block size (100k)
- add a flag -q --quiet to suppress nonessential warnings
- stop decoding flags after --, so files beginning in - can be handled
- resolved inconsistent naming: bzcat or bz2cat ?
- bzip2 --help now returns 0
-
-Programming-level changes are:
-
- fixed syntax error in GET_LL4 for Borland C++ 5.02
- let bzBuffToBuffDecompress return BZ_DATA_ERROR{_MAGIC}
- fix overshoot of mode-string end in bzopen_or_bzdopen
- wrapped bzlib.h in #ifdef __cplusplus ... extern "C" { ... }
- close file handles under all error conditions
- added minor mods so it compiles with DJGPP out of the box
- fixed Makefile so it doesn't give problems with BSD make
- fix uninitialised memory reads in dlltest.c
-
-0.9.5b
-~~~~~~
-Open stdin/stdout in binary mode for DJGPP.
-
-0.9.5c
-~~~~~~
-Changed BZ_N_OVERSHOOT to be ... + 2 instead of ... + 1. The + 1
-version could cause the sorted order to be wrong in some extremely
-obscure cases. Also changed setting of quadrant in blocksort.c.
-
-0.9.5d
-~~~~~~
-The only functional change is to make bzlibVersion() in the library
-return the correct string. This has no effect whatsoever on the
-functioning of the bzip2 program or library. Added a couple of casts
-so the library compiles without warnings at level 3 in MS Visual
-Studio 6.0. Included a Y2K statement in the file Y2K_INFO. All other
-changes are minor documentation changes.
-
-1.0
-~~~
-Several minor bugfixes and enhancements:
-
-* Large file support. The library uses 64-bit counters to
- count the volume of data passing through it. bzip2.c
- is now compiled with -D_FILE_OFFSET_BITS=64 to get large
- file support from the C library. -v correctly prints out
- file sizes greater than 4 gigabytes. All these changes have
- been made without assuming a 64-bit platform or a C compiler
- which supports 64-bit ints, so, except for the C library
- aspect, they are fully portable.
-
-* Decompression robustness. The library/program should be
- robust to any corruption of compressed data, detecting and
- handling _all_ corruption, instead of merely relying on
- the CRCs. What this means is that the program should
- never crash, given corrupted data, and the library should
- always return BZ_DATA_ERROR.
-
-* Fixed an obscure race-condition bug only ever observed on
- Solaris, in which, if you were very unlucky and issued
- control-C at exactly the wrong time, both input and output
- files would be deleted.
-
-* Don't run out of file handles on test/decompression when
- large numbers of files have invalid magic numbers.
-
-* Avoid library namespace pollution. Prefix all exported
- symbols with BZ2_.
-
-* Minor sorting enhancements from my DCC2000 paper.
-
-* Advance the version number to 1.0, so as to counteract the
- (false-in-this-case) impression some people have that programs
- with version numbers less than 1.0 are in someway, experimental,
- pre-release versions.
-
-* Create an initial Makefile-libbz2_so to build a shared library.
- Yes, I know I should really use libtool et al ...
-
-* Make the program exit with 2 instead of 0 when decompression
- fails due to a bad magic number (ie, an invalid bzip2 header).
- Also exit with 1 (as the manual claims :-) whenever a diagnostic
- message would have been printed AND the corresponding operation
- is aborted, for example
- bzip2: Output file xx already exists.
- When a diagnostic message is printed but the operation is not
- aborted, for example
- bzip2: Can't guess original name for wurble -- using wurble.out
- then the exit value 0 is returned, unless some other problem is
- also detected.
-
- I think it corresponds more closely to what the manual claims now.
-
-
-1.0.1
-~~~~~
-* Modified dlltest.c so it uses the new BZ2_ naming scheme.
-* Modified makefile-msc to fix minor build probs on Win2k.
-* Updated README.COMPILATION.PROBLEMS.
-
-There are no functionality changes or bug fixes relative to version
-1.0.0. This is just a documentation update + a fix for minor Win32
-build problems. For almost everyone, upgrading from 1.0.0 to 1.0.1 is
-utterly pointless. Don't bother.
+++ /dev/null
-
-This program, "bzip2" and associated library "libbzip2", are
-copyright (C) 1996-2000 Julian R Seward. All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions
-are met:
-
-1. Redistributions of source code must retain the above copyright
- notice, this list of conditions and the following disclaimer.
-
-2. The origin of this software must not be misrepresented; you must
- not claim that you wrote the original software. If you use this
- software in a product, an acknowledgment in the product
- documentation would be appreciated but is not required.
-
-3. Altered source versions must be plainly marked as such, and must
- not be misrepresented as being the original software.
-
-4. The name of the author may not be used to endorse or promote
- products derived from this software without specific prior written
- permission.
-
-THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
-OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
-DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
-GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
-WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
-NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-Julian Seward, Cambridge, UK.
-jseward@acm.org
-bzip2/libbzip2 version 1.0 of 21 March 2000
-
+++ /dev/null
-
-SHELL=/bin/sh
-CC=gcc
-BIGFILES=-D_FILE_OFFSET_BITS=64
-CFLAGS=-Wall -Winline -O2 -fomit-frame-pointer -fno-strength-reduce $(BIGFILES)
-
-OBJS= blocksort.o \
- huffman.o \
- crctable.o \
- randtable.o \
- compress.o \
- decompress.o \
- bzlib.o
-
-all: libbz2.a bzip2 bzip2recover test
-
-bzip2: libbz2.a bzip2.o
- $(CC) $(CFLAGS) -o bzip2 bzip2.o -L. -lbz2
-
-bzip2recover: bzip2recover.o
- $(CC) $(CFLAGS) -o bzip2recover bzip2recover.o
-
-libbz2.a: $(OBJS)
- rm -f libbz2.a
- ar cq libbz2.a $(OBJS)
- @if ( test -f /usr/bin/ranlib -o -f /bin/ranlib -o \
- -f /usr/ccs/bin/ranlib ) ; then \
- echo ranlib libbz2.a ; \
- ranlib libbz2.a ; \
- fi
-
-test: bzip2
- @cat words1
- ./bzip2 -1 < sample1.ref > sample1.rb2
- ./bzip2 -2 < sample2.ref > sample2.rb2
- ./bzip2 -3 < sample3.ref > sample3.rb2
- ./bzip2 -d < sample1.bz2 > sample1.tst
- ./bzip2 -d < sample2.bz2 > sample2.tst
- ./bzip2 -ds < sample3.bz2 > sample3.tst
- cmp sample1.bz2 sample1.rb2
- cmp sample2.bz2 sample2.rb2
- cmp sample3.bz2 sample3.rb2
- cmp sample1.tst sample1.ref
- cmp sample2.tst sample2.ref
- cmp sample3.tst sample3.ref
- @cat words3
-
-PREFIX=/usr
-
-install: bzip2 bzip2recover
- if ( test ! -d $(PREFIX)/bin ) ; then mkdir $(PREFIX)/bin ; fi
- if ( test ! -d $(PREFIX)/lib ) ; then mkdir $(PREFIX)/lib ; fi
- if ( test ! -d $(PREFIX)/man ) ; then mkdir $(PREFIX)/man ; fi
- if ( test ! -d $(PREFIX)/man/man1 ) ; then mkdir $(PREFIX)/man/man1 ; fi
- if ( test ! -d $(PREFIX)/include ) ; then mkdir $(PREFIX)/include ; fi
- cp -f bzip2 $(PREFIX)/bin/bzip2
- cp -f bzip2 $(PREFIX)/bin/bunzip2
- cp -f bzip2 $(PREFIX)/bin/bzcat
- cp -f bzip2recover $(PREFIX)/bin/bzip2recover
- chmod a+x $(PREFIX)/bin/bzip2
- chmod a+x $(PREFIX)/bin/bunzip2
- chmod a+x $(PREFIX)/bin/bzcat
- chmod a+x $(PREFIX)/bin/bzip2recover
- cp -f bzip2.1 $(PREFIX)/man/man1
- chmod a+r $(PREFIX)/man/man1/bzip2.1
- cp -f bzlib.h $(PREFIX)/include
- chmod a+r $(PREFIX)/include/bzlib.h
- cp -f libbz2.a $(PREFIX)/lib
- chmod a+r $(PREFIX)/lib/libbz2.a
-
-clean:
- rm -f *.o libbz2.a bzip2 bzip2recover \
- sample1.rb2 sample2.rb2 sample3.rb2 \
- sample1.tst sample2.tst sample3.tst
-
-blocksort.o: blocksort.c
- @cat words0
- $(CC) $(CFLAGS) -c blocksort.c
-huffman.o: huffman.c
- $(CC) $(CFLAGS) -c huffman.c
-crctable.o: crctable.c
- $(CC) $(CFLAGS) -c crctable.c
-randtable.o: randtable.c
- $(CC) $(CFLAGS) -c randtable.c
-compress.o: compress.c
- $(CC) $(CFLAGS) -c compress.c
-decompress.o: decompress.c
- $(CC) $(CFLAGS) -c decompress.c
-bzlib.o: bzlib.c
- $(CC) $(CFLAGS) -c bzlib.c
-bzip2.o: bzip2.c
- $(CC) $(CFLAGS) -c bzip2.c
-bzip2recover.o: bzip2recover.c
- $(CC) $(CFLAGS) -c bzip2recover.c
-
-DISTNAME=bzip2-1.0.1
-tarfile:
- rm -f $(DISTNAME)
- ln -sf . $(DISTNAME)
- tar cvf $(DISTNAME).tar \
- $(DISTNAME)/blocksort.c \
- $(DISTNAME)/huffman.c \
- $(DISTNAME)/crctable.c \
- $(DISTNAME)/randtable.c \
- $(DISTNAME)/compress.c \
- $(DISTNAME)/decompress.c \
- $(DISTNAME)/bzlib.c \
- $(DISTNAME)/bzip2.c \
- $(DISTNAME)/bzip2recover.c \
- $(DISTNAME)/bzlib.h \
- $(DISTNAME)/bzlib_private.h \
- $(DISTNAME)/Makefile \
- $(DISTNAME)/manual.texi \
- $(DISTNAME)/manual.ps \
- $(DISTNAME)/LICENSE \
- $(DISTNAME)/bzip2.1 \
- $(DISTNAME)/bzip2.1.preformatted \
- $(DISTNAME)/bzip2.txt \
- $(DISTNAME)/words0 \
- $(DISTNAME)/words1 \
- $(DISTNAME)/words2 \
- $(DISTNAME)/words3 \
- $(DISTNAME)/sample1.ref \
- $(DISTNAME)/sample2.ref \
- $(DISTNAME)/sample3.ref \
- $(DISTNAME)/sample1.bz2 \
- $(DISTNAME)/sample2.bz2 \
- $(DISTNAME)/sample3.bz2 \
- $(DISTNAME)/dlltest.c \
- $(DISTNAME)/*.html \
- $(DISTNAME)/README \
- $(DISTNAME)/README.COMPILATION.PROBLEMS \
- $(DISTNAME)/CHANGES \
- $(DISTNAME)/libbz2.def \
- $(DISTNAME)/libbz2.dsp \
- $(DISTNAME)/dlltest.dsp \
- $(DISTNAME)/makefile.msc \
- $(DISTNAME)/Y2K_INFO \
- $(DISTNAME)/unzcrash.c \
- $(DISTNAME)/spewG.c \
- $(DISTNAME)/Makefile-libbz2_so
+++ /dev/null
-
-# This Makefile builds a shared version of the library,
-# libbz2.so.1.0.1, with soname libbz2.so.1.0,
-# at least on x86-Linux (RedHat 5.2),
-# with gcc-2.7.2.3. Please see the README file for some
-# important info about building the library like this.
-
-SHELL=/bin/sh
-CC=gcc
-BIGFILES=-D_FILE_OFFSET_BITS=64
-CFLAGS=-fpic -fPIC -Wall -Winline -O2 -fomit-frame-pointer -fno-strength-reduce $(BIGFILES)
-
-OBJS= blocksort.o \
- huffman.o \
- crctable.o \
- randtable.o \
- compress.o \
- decompress.o \
- bzlib.o
-
-all: $(OBJS)
- $(CC) -shared -Wl,-soname -Wl,libbz2.so.1.0 -o libbz2.so.1.0.1 $(OBJS)
- $(CC) $(CFLAGS) -o bzip2-shared bzip2.c libbz2.so.1.0.1
- rm -f libbz2.so.1.0
- ln -s libbz2.so.1.0.1 libbz2.so.1.0
-
-clean:
- rm -f $(OBJS) bzip2.o libbz2.so.1.0.1 libbz2.so.1.0 bzip2-shared
-
-blocksort.o: blocksort.c
- $(CC) $(CFLAGS) -c blocksort.c
-huffman.o: huffman.c
- $(CC) $(CFLAGS) -c huffman.c
-crctable.o: crctable.c
- $(CC) $(CFLAGS) -c crctable.c
-randtable.o: randtable.c
- $(CC) $(CFLAGS) -c randtable.c
-compress.o: compress.c
- $(CC) $(CFLAGS) -c compress.c
-decompress.o: decompress.c
- $(CC) $(CFLAGS) -c decompress.c
-bzlib.o: bzlib.c
- $(CC) $(CFLAGS) -c bzlib.c
+++ /dev/null
-
-This is the README for bzip2, a block-sorting file compressor, version
-1.0. This version is fully compatible with the previous public
-releases, bzip2-0.1pl2, bzip2-0.9.0 and bzip2-0.9.5.
-
-bzip2-1.0 is distributed under a BSD-style license. For details,
-see the file LICENSE.
-
-Complete documentation is available in Postscript form (manual.ps) or
-html (manual_toc.html). A plain-text version of the manual page is
-available as bzip2.txt. A statement about Y2K issues is now included
-in the file Y2K_INFO.
-
-
-HOW TO BUILD -- UNIX
-
-Type `make'. This builds the library libbz2.a and then the
-programs bzip2 and bzip2recover. Six self-tests are run.
-If the self-tests complete ok, carry on to installation:
-
-To install in /usr/bin, /usr/lib, /usr/man and /usr/include, type
- make install
-To install somewhere else, eg, /xxx/yyy/{bin,lib,man,include}, type
- make install PREFIX=/xxx/yyy
-If you are (justifiably) paranoid and want to see what 'make install'
-is going to do, you can first do
- make -n install or
- make -n install PREFIX=/xxx/yyy respectively.
-The -n instructs make to show the commands it would execute, but
-not actually execute them.
-
-
-HOW TO BUILD -- UNIX, shared library libbz2.so.
-
-Do 'make -f Makefile-libbz2_so'. This Makefile seems to work for
-Linux-ELF (RedHat 5.2 on an x86 box), with gcc. I make no claims
-that it works for any other platform, though I suspect it probably
-will work for most platforms employing both ELF and gcc.
-
-bzip2-shared, a client of the shared library, is also build, but
-not self-tested. So I suggest you also build using the normal
-Makefile, since that conducts a self-test.
-
-Important note for people upgrading .so's from 0.9.0/0.9.5 to
-version 1.0. All the functions in the library have been renamed,
-from (eg) bzCompress to BZ2_bzCompress, to avoid namespace pollution.
-Unfortunately this means that the libbz2.so created by
-Makefile-libbz2_so will not work with any program which used an
-older version of the library. Sorry. I do encourage library
-clients to make the effort to upgrade to use version 1.0, since
-it is both faster and more robust than previous versions.
-
-
-HOW TO BUILD -- Windows 95, NT, DOS, Mac, etc.
-
-It's difficult for me to support compilation on all these platforms.
-My approach is to collect binaries for these platforms, and put them
-on the master web page (http://sourceware.cygnus.com/bzip2). Look
-there. However (FWIW), bzip2-1.0 is very standard ANSI C and should
-compile unmodified with MS Visual C. For Win32, there is one
-important caveat: in bzip2.c, you must set BZ_UNIX to 0 and
-BZ_LCCWIN32 to 1 before building. If you have difficulties building,
-you might want to read README.COMPILATION.PROBLEMS.
-
-
-VALIDATION
-
-Correct operation, in the sense that a compressed file can always be
-decompressed to reproduce the original, is obviously of paramount
-importance. To validate bzip2, I used a modified version of Mark
-Nelson's churn program. Churn is an automated test driver which
-recursively traverses a directory structure, using bzip2 to compress
-and then decompress each file it encounters, and checking that the
-decompressed data is the same as the original. There are more details
-in Section 4 of the user guide.
-
-
-
-Please read and be aware of the following:
-
-WARNING:
-
- This program (attempts to) compress data by performing several
- non-trivial transformations on it. Unless you are 100% familiar
- with *all* the algorithms contained herein, and with the
- consequences of modifying them, you should NOT meddle with the
- compression or decompression machinery. Incorrect changes can and
- very likely *will* lead to disastrous loss of data.
-
-
-DISCLAIMER:
-
- I TAKE NO RESPONSIBILITY FOR ANY LOSS OF DATA ARISING FROM THE
- USE OF THIS PROGRAM, HOWSOEVER CAUSED.
-
- Every compression of a file implies an assumption that the
- compressed file can be decompressed to reproduce the original.
- Great efforts in design, coding and testing have been made to
- ensure that this program works correctly. However, the complexity
- of the algorithms, and, in particular, the presence of various
- special cases in the code which occur with very low but non-zero
- probability make it impossible to rule out the possibility of bugs
- remaining in the program. DO NOT COMPRESS ANY DATA WITH THIS
- PROGRAM UNLESS YOU ARE PREPARED TO ACCEPT THE POSSIBILITY, HOWEVER
- SMALL, THAT THE DATA WILL NOT BE RECOVERABLE.
-
- That is not to say this program is inherently unreliable. Indeed,
- I very much hope the opposite is true. bzip2 has been carefully
- constructed and extensively tested.
-
-
-PATENTS:
-
- To the best of my knowledge, bzip2 does not use any patented
- algorithms. However, I do not have the resources available to
- carry out a full patent search. Therefore I cannot give any
- guarantee of the above statement.
-
-End of legalities.
-
-
-WHAT'S NEW IN 0.9.0 (as compared to 0.1pl2) ?
-
- * Approx 10% faster compression, 30% faster decompression
- * -t (test mode) is a lot quicker
- * Can decompress concatenated compressed files
- * Programming interface, so programs can directly read/write .bz2 files
- * Less restrictive (BSD-style) licensing
- * Flag handling more compatible with GNU gzip
- * Much more documentation, i.e., a proper user manual
- * Hopefully, improved portability (at least of the library)
-
-WHAT'S NEW IN 0.9.5 ?
-
- * Compression speed is much less sensitive to the input
- data than in previous versions. Specifically, the very
- slow performance caused by repetitive data is fixed.
- * Many small improvements in file and flag handling.
- * A Y2K statement.
-
-WHAT'S NEW IN 1.0
-
- See the CHANGES file.
-
-I hope you find bzip2 useful. Feel free to contact me at
- jseward@acm.org
-if you have any suggestions or queries. Many people mailed me with
-comments, suggestions and patches after the releases of bzip-0.15,
-bzip-0.21, bzip2-0.1pl2 and bzip2-0.9.0, and the changes in bzip2 are
-largely a result of this feedback. I thank you for your comments.
-
-At least for the time being, bzip2's "home" is (or can be reached via)
-http://www.muraroa.demon.co.uk.
-
-Julian Seward
-jseward@acm.org
-
-Cambridge, UK
-18 July 1996 (version 0.15)
-25 August 1996 (version 0.21)
- 7 August 1997 (bzip2, version 0.1)
-29 August 1997 (bzip2, version 0.1pl2)
-23 August 1998 (bzip2, version 0.9.0)
- 8 June 1999 (bzip2, version 0.9.5)
- 4 Sept 1999 (bzip2, version 0.9.5d)
- 5 May 2000 (bzip2, version 1.0pre8)
+++ /dev/null
-
-bzip2-1.0 should compile without problems on the vast majority of
-platforms. Using the supplied Makefile, I've built and tested it
-myself for x86-linux, sparc-solaris, alpha-linux, x86-cygwin32 and
-alpha-tru64unix. With makefile.msc, Visual C++ 6.0 and nmake, you can
-build a native Win32 version too. Large file support seems to work
-correctly on at least alpha-tru64unix and x86-cygwin32 (on Windows
-2000).
-
-When I say "large file" I mean a file of size 2,147,483,648 (2^31)
-bytes or above. Many older OSs can't handle files above this size,
-but many newer ones can. Large files are pretty huge -- most files
-you'll encounter are not Large Files.
-
-Earlier versions of bzip2 (0.1, 0.9.0, 0.9.5) compiled on a wide
-variety of platforms without difficulty, and I hope this version will
-continue in that tradition. However, in order to support large files,
-I've had to include the define -D_FILE_OFFSET_BITS=64 in the Makefile.
-This can cause problems.
-
-The technique of adding -D_FILE_OFFSET_BITS=64 to get large file
-support is, as far as I know, the Recommended Way to get correct large
-file support. For more details, see the Large File Support
-Specification, published by the Large File Summit, at
- http://www.sas.com/standard/large.file/
-
-As a general comment, if you get compilation errors which you think
-are related to large file support, try removing the above define from
-the Makefile, ie, delete the line
- BIGFILES=-D_FILE_OFFSET_BITS=64
-from the Makefile, and do 'make clean ; make'. This will give you a
-version of bzip2 without large file support, which, for most
-applications, is probably not a problem.
-
-Alternatively, try some of the platform-specific hints listed below.
-
-You can use the spewG.c program to generate huge files to test bzip2's
-large file support, if you are feeling paranoid. Be aware though that
-any compilation problems which affect bzip2 will also affect spewG.c,
-alas.
-
-
-Known problems as of 1.0pre8:
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-* HP/UX 10.20 and 11.00, using gcc (2.7.2.3 and 2.95.2): A large
- number of warnings appear, including the following:
-
- /usr/include/sys/resource.h: In function `getrlimit':
- /usr/include/sys/resource.h:168:
- warning: implicit declaration of function `__getrlimit64'
- /usr/include/sys/resource.h: In function `setrlimit':
- /usr/include/sys/resource.h:170:
- warning: implicit declaration of function `__setrlimit64'
-
- This would appear to be a problem with large file support, header
- files and gcc. gcc may or may not give up at this point. If it
- fails, you might be able to improve matters by adding
- -D__STDC_EXT__=1
- to the BIGFILES variable in the Makefile (ie, change its definition
- to
- BIGFILES=-D_FILE_OFFSET_BITS=64 -D__STDC_EXT__=1
-
- Even if gcc does produce a binary which appears to work (ie passes
- its self-tests), you might want to test it to see if it works properly
- on large files.
-
-
-* HP/UX 10.20 and 11.00, using HP's cc compiler.
-
- No specific problems for this combination, except that you'll need to
- specify the -Ae flag, and zap the gcc-specific stuff
- -Wall -Winline -O2 -fomit-frame-pointer -fno-strength-reduce.
- You should retain -D_FILE_OFFSET_BITS=64 in order to get large
- file support -- which is reported to work ok for this HP/UX + cc
- combination.
-
-
-* SunOS 4.1.X.
-
- Amazingly, there are still people out there using this venerable old
- banger. I shouldn't be too rude -- I started life on SunOS, and
- it was a pretty darn good OS, way back then. Anyway:
-
- SunOS doesn't seem to have strerror(), so you'll have to use
- perror(), perhaps by doing adding this (warning: UNTESTED CODE):
-
- char* strerror ( int errnum )
- {
- if (errnum < 0 || errnum >= sys_nerr)
- return "Unknown error";
- else
- return sys_errlist[errnum];
- }
-
- Or you could comment out the relevant calls to strerror; they're
- not mission-critical. Or you could upgrade to Solaris. Ha ha ha!
- (what?? you think I've got Bad Attitude?)
-
-
-* Making a shared library on Solaris. (Not really a compilation
- problem, but many people ask ...)
-
- Firstly, if you have Solaris 8, either you have libbz2.so already
- on your system, or you can install it from the Solaris CD.
-
- Secondly, be aware that there are potential naming conflicts
- between the .so file supplied with Solaris 8, and the .so file
- which Makefile-libbz2_so will make. Makefile-libbz2_so creates
- a .so which has the names which I intend to be "official" as
- of version 1.0.0 and onwards. Unfortunately, the .so in
- Solaris 8 appeared before I decided on the final names, so
- the two libraries are incompatible. We have since communicated
- and I hope that the problems will have been solved in the next
- version of Solaris, whenever that might appear.
-
- All that said: you might be able to get somewhere
- by finding the line in Makefile-libbz2_so which says
-
- $(CC) -shared -Wl,-soname -Wl,libbz2.so.1.0 -o libbz2.so.1.0.1 $(OBJS)
-
- and replacing with
-
- ($CC) -G -shared -o libbz2.so.1.0.1 -h libbz2.so.1.0 $(OBJS)
-
- If gcc objects to the combination -fpic -fPIC, get rid of
- the second one, leaving just "-fpic".
-
-
-That's the end of the currently known compilation problems.
+++ /dev/null
-
-Y2K status of bzip2 and libbzip2, versions 0.1, 0.9.0 and 0.9.5
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-Informally speaking:
- bzip2 is a compression program built on top of libbzip2,
- a library which does the real work of compression and
- decompression. As far as I am aware, libbzip2 does not have
- any date-related code at all.
-
- bzip2 itself copies dates from source to destination files
- when compressing or decompressing, using the 'stat' and 'utime'
- UNIX system calls. It doesn't examine, manipulate or store the
- dates in any way. So as far as I can see, there shouldn't be any
- problem with bzip2 providing 'stat' and 'utime' work correctly
- on your system.
-
- On non-unix platforms (those for which BZ_UNIX in bzip2.c is
- not set to 1), bzip2 doesn't even do the date copying.
-
- Overall, informally speaking, I don't think bzip2 or libbzip2
- have a Y2K problem.
-
-Formally speaking:
- I am not prepared to offer you any assurance whatsoever
- regarding Y2K issues in my software. You alone assume the
- entire risk of using the software. The disclaimer of liability
- in the LICENSE file in the bzip2 source distribution continues
- to apply on this issue as with every other issue pertaining
- to the software.
-
-Julian Seward
-Cambridge, UK
-25 August 1999
+++ /dev/null
-
-/*-------------------------------------------------------------*/
-/*--- Block sorting machinery ---*/
-/*--- blocksort.c ---*/
-/*-------------------------------------------------------------*/
-
-/*--
- This file is a part of bzip2 and/or libbzip2, a program and
- library for lossless, block-sorting data compression.
-
- Copyright (C) 1996-2000 Julian R Seward. All rights reserved.
-
- Redistribution and use in source and binary forms, with or without
- modification, are permitted provided that the following conditions
- are met:
-
- 1. Redistributions of source code must retain the above copyright
- notice, this list of conditions and the following disclaimer.
-
- 2. The origin of this software must not be misrepresented; you must
- not claim that you wrote the original software. If you use this
- software in a product, an acknowledgment in the product
- documentation would be appreciated but is not required.
-
- 3. Altered source versions must be plainly marked as such, and must
- not be misrepresented as being the original software.
-
- 4. The name of the author may not be used to endorse or promote
- products derived from this software without specific prior written
- permission.
-
- THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
- OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
- DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
- GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
- Julian Seward, Cambridge, UK.
- jseward@acm.org
- bzip2/libbzip2 version 1.0 of 21 March 2000
-
- This program is based on (at least) the work of:
- Mike Burrows
- David Wheeler
- Peter Fenwick
- Alistair Moffat
- Radford Neal
- Ian H. Witten
- Robert Sedgewick
- Jon L. Bentley
-
- For more information on these sources, see the manual.
-
- To get some idea how the block sorting algorithms in this file
- work, read my paper
- On the Performance of BWT Sorting Algorithms
- in Proceedings of the IEEE Data Compression Conference 2000,
- Snowbird, Utah, USA, 27-30 March 2000. The main sort in this
- file implements the algorithm called cache in the paper.
---*/
-
-
-#include "bzlib_private.h"
-
-/*---------------------------------------------*/
-/*--- Fallback O(N log(N)^2) sorting ---*/
-/*--- algorithm, for repetitive blocks ---*/
-/*---------------------------------------------*/
-
-/*---------------------------------------------*/
-static
-__inline__
-void fallbackSimpleSort ( UInt32* fmap,
- UInt32* eclass,
- Int32 lo,
- Int32 hi )
-{
- Int32 i, j, tmp;
- UInt32 ec_tmp;
-
- if (lo == hi) return;
-
- if (hi - lo > 3) {
- for ( i = hi-4; i >= lo; i-- ) {
- tmp = fmap[i];
- ec_tmp = eclass[tmp];
- for ( j = i+4; j <= hi && ec_tmp > eclass[fmap[j]]; j += 4 )
- fmap[j-4] = fmap[j];
- fmap[j-4] = tmp;
- }
- }
-
- for ( i = hi-1; i >= lo; i-- ) {
- tmp = fmap[i];
- ec_tmp = eclass[tmp];
- for ( j = i+1; j <= hi && ec_tmp > eclass[fmap[j]]; j++ )
- fmap[j-1] = fmap[j];
- fmap[j-1] = tmp;
- }
-}
-
-
-/*---------------------------------------------*/
-#define fswap(zz1, zz2) \
- { Int32 zztmp = zz1; zz1 = zz2; zz2 = zztmp; }
-
-#define fvswap(zzp1, zzp2, zzn) \
-{ \
- Int32 yyp1 = (zzp1); \
- Int32 yyp2 = (zzp2); \
- Int32 yyn = (zzn); \
- while (yyn > 0) { \
- fswap(fmap[yyp1], fmap[yyp2]); \
- yyp1++; yyp2++; yyn--; \
- } \
-}
-
-
-#define fmin(a,b) ((a) < (b)) ? (a) : (b)
-
-#define fpush(lz,hz) { stackLo[sp] = lz; \
- stackHi[sp] = hz; \
- sp++; }
-
-#define fpop(lz,hz) { sp--; \
- lz = stackLo[sp]; \
- hz = stackHi[sp]; }
-
-#define FALLBACK_QSORT_SMALL_THRESH 10
-#define FALLBACK_QSORT_STACK_SIZE 100
-
-
-static
-void fallbackQSort3 ( UInt32* fmap,
- UInt32* eclass,
- Int32 loSt,
- Int32 hiSt )
-{
- Int32 unLo, unHi, ltLo, gtHi, n, m;
- Int32 sp, lo, hi;
- UInt32 med, r, r3;
- Int32 stackLo[FALLBACK_QSORT_STACK_SIZE];
- Int32 stackHi[FALLBACK_QSORT_STACK_SIZE];
-
- r = 0;
-
- sp = 0;
- fpush ( loSt, hiSt );
-
- while (sp > 0) {
-
- AssertH ( sp < FALLBACK_QSORT_STACK_SIZE, 1004 );
-
- fpop ( lo, hi );
- if (hi - lo < FALLBACK_QSORT_SMALL_THRESH) {
- fallbackSimpleSort ( fmap, eclass, lo, hi );
- continue;
- }
-
- /* Random partitioning. Median of 3 sometimes fails to
- avoid bad cases. Median of 9 seems to help but
- looks rather expensive. This too seems to work but
- is cheaper. Guidance for the magic constants
- 7621 and 32768 is taken from Sedgewick's algorithms
- book, chapter 35.
- */
- r = ((r * 7621) + 1) % 32768;
- r3 = r % 3;
- if (r3 == 0) med = eclass[fmap[lo]]; else
- if (r3 == 1) med = eclass[fmap[(lo+hi)>>1]]; else
- med = eclass[fmap[hi]];
-
- unLo = ltLo = lo;
- unHi = gtHi = hi;
-
- while (1) {
- while (1) {
- if (unLo > unHi) break;
- n = (Int32)eclass[fmap[unLo]] - (Int32)med;
- if (n == 0) {
- fswap(fmap[unLo], fmap[ltLo]);
- ltLo++; unLo++;
- continue;
- };
- if (n > 0) break;
- unLo++;
- }
- while (1) {
- if (unLo > unHi) break;
- n = (Int32)eclass[fmap[unHi]] - (Int32)med;
- if (n == 0) {
- fswap(fmap[unHi], fmap[gtHi]);
- gtHi--; unHi--;
- continue;
- };
- if (n < 0) break;
- unHi--;
- }
- if (unLo > unHi) break;
- fswap(fmap[unLo], fmap[unHi]); unLo++; unHi--;
- }
-
- AssertD ( unHi == unLo-1, "fallbackQSort3(2)" );
-
- if (gtHi < ltLo) continue;
-
- n = fmin(ltLo-lo, unLo-ltLo); fvswap(lo, unLo-n, n);
- m = fmin(hi-gtHi, gtHi-unHi); fvswap(unLo, hi-m+1, m);
-
- n = lo + unLo - ltLo - 1;
- m = hi - (gtHi - unHi) + 1;
-
- if (n - lo > hi - m) {
- fpush ( lo, n );
- fpush ( m, hi );
- } else {
- fpush ( m, hi );
- fpush ( lo, n );
- }
- }
-}
-
-#undef fmin
-#undef fpush
-#undef fpop
-#undef fswap
-#undef fvswap
-#undef FALLBACK_QSORT_SMALL_THRESH
-#undef FALLBACK_QSORT_STACK_SIZE
-
-
-/*---------------------------------------------*/
-/* Pre:
- nblock > 0
- eclass exists for [0 .. nblock-1]
- ((UChar*)eclass) [0 .. nblock-1] holds block
- ptr exists for [0 .. nblock-1]
-
- Post:
- ((UChar*)eclass) [0 .. nblock-1] holds block
- All other areas of eclass destroyed
- fmap [0 .. nblock-1] holds sorted order
- bhtab [ 0 .. 2+(nblock/32) ] destroyed
-*/
-
-#define SET_BH(zz) bhtab[(zz) >> 5] |= (1 << ((zz) & 31))
-#define CLEAR_BH(zz) bhtab[(zz) >> 5] &= ~(1 << ((zz) & 31))
-#define ISSET_BH(zz) (bhtab[(zz) >> 5] & (1 << ((zz) & 31)))
-#define WORD_BH(zz) bhtab[(zz) >> 5]
-#define UNALIGNED_BH(zz) ((zz) & 0x01f)
-
-static
-void fallbackSort ( UInt32* fmap,
- UInt32* eclass,
- UInt32* bhtab,
- Int32 nblock,
- Int32 verb )
-{
- Int32 ftab[257];
- Int32 ftabCopy[256];
- Int32 H, i, j, k, l, r, cc, cc1;
- Int32 nNotDone;
- Int32 nBhtab;
- UChar* eclass8 = (UChar*)eclass;
-
- /*--
- Initial 1-char radix sort to generate
- initial fmap and initial BH bits.
- --*/
- if (verb >= 4)
- VPrintf0 ( " bucket sorting ...\n" );
- for (i = 0; i < 257; i++) ftab[i] = 0;
- for (i = 0; i < nblock; i++) ftab[eclass8[i]]++;
- for (i = 0; i < 256; i++) ftabCopy[i] = ftab[i];
- for (i = 1; i < 257; i++) ftab[i] += ftab[i-1];
-
- for (i = 0; i < nblock; i++) {
- j = eclass8[i];
- k = ftab[j] - 1;
- ftab[j] = k;
- fmap[k] = i;
- }
-
- nBhtab = 2 + (nblock / 32);
- for (i = 0; i < nBhtab; i++) bhtab[i] = 0;
- for (i = 0; i < 256; i++) SET_BH(ftab[i]);
-
- /*--
- Inductively refine the buckets. Kind-of an
- "exponential radix sort" (!), inspired by the
- Manber-Myers suffix array construction algorithm.
- --*/
-
- /*-- set sentinel bits for block-end detection --*/
- for (i = 0; i < 32; i++) {
- SET_BH(nblock + 2*i);
- CLEAR_BH(nblock + 2*i + 1);
- }
-
- /*-- the log(N) loop --*/
- H = 1;
- while (1) {
-
- if (verb >= 4)
- VPrintf1 ( " depth %6d has ", H );
-
- j = 0;
- for (i = 0; i < nblock; i++) {
- if (ISSET_BH(i)) j = i;
- k = fmap[i] - H; if (k < 0) k += nblock;
- eclass[k] = j;
- }
-
- nNotDone = 0;
- r = -1;
- while (1) {
-
- /*-- find the next non-singleton bucket --*/
- k = r + 1;
- while (ISSET_BH(k) && UNALIGNED_BH(k)) k++;
- if (ISSET_BH(k)) {
- while (WORD_BH(k) == 0xffffffff) k += 32;
- while (ISSET_BH(k)) k++;
- }
- l = k - 1;
- if (l >= nblock) break;
- while (!ISSET_BH(k) && UNALIGNED_BH(k)) k++;
- if (!ISSET_BH(k)) {
- while (WORD_BH(k) == 0x00000000) k += 32;
- while (!ISSET_BH(k)) k++;
- }
- r = k - 1;
- if (r >= nblock) break;
-
- /*-- now [l, r] bracket current bucket --*/
- if (r > l) {
- nNotDone += (r - l + 1);
- fallbackQSort3 ( fmap, eclass, l, r );
-
- /*-- scan bucket and generate header bits-- */
- cc = -1;
- for (i = l; i <= r; i++) {
- cc1 = eclass[fmap[i]];
- if (cc != cc1) { SET_BH(i); cc = cc1; };
- }
- }
- }
-
- if (verb >= 4)
- VPrintf1 ( "%6d unresolved strings\n", nNotDone );
-
- H *= 2;
- if (H > nblock || nNotDone == 0) break;
- }
-
- /*--
- Reconstruct the original block in
- eclass8 [0 .. nblock-1], since the
- previous phase destroyed it.
- --*/
- if (verb >= 4)
- VPrintf0 ( " reconstructing block ...\n" );
- j = 0;
- for (i = 0; i < nblock; i++) {
- while (ftabCopy[j] == 0) j++;
- ftabCopy[j]--;
- eclass8[fmap[i]] = (UChar)j;
- }
- AssertH ( j < 256, 1005 );
-}
-
-#undef SET_BH
-#undef CLEAR_BH
-#undef ISSET_BH
-#undef WORD_BH
-#undef UNALIGNED_BH
-
-
-/*---------------------------------------------*/
-/*--- The main, O(N^2 log(N)) sorting ---*/
-/*--- algorithm. Faster for "normal" ---*/
-/*--- non-repetitive blocks. ---*/
-/*---------------------------------------------*/
-
-/*---------------------------------------------*/
-static
-__inline__
-Bool mainGtU ( UInt32 i1,
- UInt32 i2,
- UChar* block,
- UInt16* quadrant,
- UInt32 nblock,
- Int32* budget )
-{
- Int32 k;
- UChar c1, c2;
- UInt16 s1, s2;
-
- AssertD ( i1 != i2, "mainGtU" );
- /* 1 */
- c1 = block[i1]; c2 = block[i2];
- if (c1 != c2) return (c1 > c2);
- i1++; i2++;
- /* 2 */
- c1 = block[i1]; c2 = block[i2];
- if (c1 != c2) return (c1 > c2);
- i1++; i2++;
- /* 3 */
- c1 = block[i1]; c2 = block[i2];
- if (c1 != c2) return (c1 > c2);
- i1++; i2++;
- /* 4 */
- c1 = block[i1]; c2 = block[i2];
- if (c1 != c2) return (c1 > c2);
- i1++; i2++;
- /* 5 */
- c1 = block[i1]; c2 = block[i2];
- if (c1 != c2) return (c1 > c2);
- i1++; i2++;
- /* 6 */
- c1 = block[i1]; c2 = block[i2];
- if (c1 != c2) return (c1 > c2);
- i1++; i2++;
- /* 7 */
- c1 = block[i1]; c2 = block[i2];
- if (c1 != c2) return (c1 > c2);
- i1++; i2++;
- /* 8 */
- c1 = block[i1]; c2 = block[i2];
- if (c1 != c2) return (c1 > c2);
- i1++; i2++;
- /* 9 */
- c1 = block[i1]; c2 = block[i2];
- if (c1 != c2) return (c1 > c2);
- i1++; i2++;
- /* 10 */
- c1 = block[i1]; c2 = block[i2];
- if (c1 != c2) return (c1 > c2);
- i1++; i2++;
- /* 11 */
- c1 = block[i1]; c2 = block[i2];
- if (c1 != c2) return (c1 > c2);
- i1++; i2++;
- /* 12 */
- c1 = block[i1]; c2 = block[i2];
- if (c1 != c2) return (c1 > c2);
- i1++; i2++;
-
- k = nblock + 8;
-
- do {
- /* 1 */
- c1 = block[i1]; c2 = block[i2];
- if (c1 != c2) return (c1 > c2);
- s1 = quadrant[i1]; s2 = quadrant[i2];
- if (s1 != s2) return (s1 > s2);
- i1++; i2++;
- /* 2 */
- c1 = block[i1]; c2 = block[i2];
- if (c1 != c2) return (c1 > c2);
- s1 = quadrant[i1]; s2 = quadrant[i2];
- if (s1 != s2) return (s1 > s2);
- i1++; i2++;
- /* 3 */
- c1 = block[i1]; c2 = block[i2];
- if (c1 != c2) return (c1 > c2);
- s1 = quadrant[i1]; s2 = quadrant[i2];
- if (s1 != s2) return (s1 > s2);
- i1++; i2++;
- /* 4 */
- c1 = block[i1]; c2 = block[i2];
- if (c1 != c2) return (c1 > c2);
- s1 = quadrant[i1]; s2 = quadrant[i2];
- if (s1 != s2) return (s1 > s2);
- i1++; i2++;
- /* 5 */
- c1 = block[i1]; c2 = block[i2];
- if (c1 != c2) return (c1 > c2);
- s1 = quadrant[i1]; s2 = quadrant[i2];
- if (s1 != s2) return (s1 > s2);
- i1++; i2++;
- /* 6 */
- c1 = block[i1]; c2 = block[i2];
- if (c1 != c2) return (c1 > c2);
- s1 = quadrant[i1]; s2 = quadrant[i2];
- if (s1 != s2) return (s1 > s2);
- i1++; i2++;
- /* 7 */
- c1 = block[i1]; c2 = block[i2];
- if (c1 != c2) return (c1 > c2);
- s1 = quadrant[i1]; s2 = quadrant[i2];
- if (s1 != s2) return (s1 > s2);
- i1++; i2++;
- /* 8 */
- c1 = block[i1]; c2 = block[i2];
- if (c1 != c2) return (c1 > c2);
- s1 = quadrant[i1]; s2 = quadrant[i2];
- if (s1 != s2) return (s1 > s2);
- i1++; i2++;
-
- if (i1 >= nblock) i1 -= nblock;
- if (i2 >= nblock) i2 -= nblock;
-
- k -= 8;
- (*budget)--;
- }
- while (k >= 0);
-
- return False;
-}
-
-
-/*---------------------------------------------*/
-/*--
- Knuth's increments seem to work better
- than Incerpi-Sedgewick here. Possibly
- because the number of elems to sort is
- usually small, typically <= 20.
---*/
-static
-Int32 incs[14] = { 1, 4, 13, 40, 121, 364, 1093, 3280,
- 9841, 29524, 88573, 265720,
- 797161, 2391484 };
-
-static
-void mainSimpleSort ( UInt32* ptr,
- UChar* block,
- UInt16* quadrant,
- Int32 nblock,
- Int32 lo,
- Int32 hi,
- Int32 d,
- Int32* budget )
-{
- Int32 i, j, h, bigN, hp;
- UInt32 v;
-
- bigN = hi - lo + 1;
- if (bigN < 2) return;
-
- hp = 0;
- while (incs[hp] < bigN) hp++;
- hp--;
-
- for (; hp >= 0; hp--) {
- h = incs[hp];
-
- i = lo + h;
- while (True) {
-
- /*-- copy 1 --*/
- if (i > hi) break;
- v = ptr[i];
- j = i;
- while ( mainGtU (
- ptr[j-h]+d, v+d, block, quadrant, nblock, budget
- ) ) {
- ptr[j] = ptr[j-h];
- j = j - h;
- if (j <= (lo + h - 1)) break;
- }
- ptr[j] = v;
- i++;
-
- /*-- copy 2 --*/
- if (i > hi) break;
- v = ptr[i];
- j = i;
- while ( mainGtU (
- ptr[j-h]+d, v+d, block, quadrant, nblock, budget
- ) ) {
- ptr[j] = ptr[j-h];
- j = j - h;
- if (j <= (lo + h - 1)) break;
- }
- ptr[j] = v;
- i++;
-
- /*-- copy 3 --*/
- if (i > hi) break;
- v = ptr[i];
- j = i;
- while ( mainGtU (
- ptr[j-h]+d, v+d, block, quadrant, nblock, budget
- ) ) {
- ptr[j] = ptr[j-h];
- j = j - h;
- if (j <= (lo + h - 1)) break;
- }
- ptr[j] = v;
- i++;
-
- if (*budget < 0) return;
- }
- }
-}
-
-
-/*---------------------------------------------*/
-/*--
- The following is an implementation of
- an elegant 3-way quicksort for strings,
- described in a paper "Fast Algorithms for
- Sorting and Searching Strings", by Robert
- Sedgewick and Jon L. Bentley.
---*/
-
-#define mswap(zz1, zz2) \
- { Int32 zztmp = zz1; zz1 = zz2; zz2 = zztmp; }
-
-#define mvswap(zzp1, zzp2, zzn) \
-{ \
- Int32 yyp1 = (zzp1); \
- Int32 yyp2 = (zzp2); \
- Int32 yyn = (zzn); \
- while (yyn > 0) { \
- mswap(ptr[yyp1], ptr[yyp2]); \
- yyp1++; yyp2++; yyn--; \
- } \
-}
-
-static
-__inline__
-UChar mmed3 ( UChar a, UChar b, UChar c )
-{
- UChar t;
- if (a > b) { t = a; a = b; b = t; };
- if (b > c) {
- b = c;
- if (a > b) b = a;
- }
- return b;
-}
-
-#define mmin(a,b) ((a) < (b)) ? (a) : (b)
-
-#define mpush(lz,hz,dz) { stackLo[sp] = lz; \
- stackHi[sp] = hz; \
- stackD [sp] = dz; \
- sp++; }
-
-#define mpop(lz,hz,dz) { sp--; \
- lz = stackLo[sp]; \
- hz = stackHi[sp]; \
- dz = stackD [sp]; }
-
-
-#define mnextsize(az) (nextHi[az]-nextLo[az])
-
-#define mnextswap(az,bz) \
- { Int32 tz; \
- tz = nextLo[az]; nextLo[az] = nextLo[bz]; nextLo[bz] = tz; \
- tz = nextHi[az]; nextHi[az] = nextHi[bz]; nextHi[bz] = tz; \
- tz = nextD [az]; nextD [az] = nextD [bz]; nextD [bz] = tz; }
-
-
-#define MAIN_QSORT_SMALL_THRESH 20
-#define MAIN_QSORT_DEPTH_THRESH (BZ_N_RADIX + BZ_N_QSORT)
-#define MAIN_QSORT_STACK_SIZE 100
-
-static
-void mainQSort3 ( UInt32* ptr,
- UChar* block,
- UInt16* quadrant,
- Int32 nblock,
- Int32 loSt,
- Int32 hiSt,
- Int32 dSt,
- Int32* budget )
-{
- Int32 unLo, unHi, ltLo, gtHi, n, m, med;
- Int32 sp, lo, hi, d;
-
- Int32 stackLo[MAIN_QSORT_STACK_SIZE];
- Int32 stackHi[MAIN_QSORT_STACK_SIZE];
- Int32 stackD [MAIN_QSORT_STACK_SIZE];
-
- Int32 nextLo[3];
- Int32 nextHi[3];
- Int32 nextD [3];
-
- sp = 0;
- mpush ( loSt, hiSt, dSt );
-
- while (sp > 0) {
-
- AssertH ( sp < MAIN_QSORT_STACK_SIZE, 1001 );
-
- mpop ( lo, hi, d );
- if (hi - lo < MAIN_QSORT_SMALL_THRESH ||
- d > MAIN_QSORT_DEPTH_THRESH) {
- mainSimpleSort ( ptr, block, quadrant, nblock, lo, hi, d, budget );
- if (*budget < 0) return;
- continue;
- }
-
- med = (Int32)
- mmed3 ( block[ptr[ lo ]+d],
- block[ptr[ hi ]+d],
- block[ptr[ (lo+hi)>>1 ]+d] );
-
- unLo = ltLo = lo;
- unHi = gtHi = hi;
-
- while (True) {
- while (True) {
- if (unLo > unHi) break;
- n = ((Int32)block[ptr[unLo]+d]) - med;
- if (n == 0) {
- mswap(ptr[unLo], ptr[ltLo]);
- ltLo++; unLo++; continue;
- };
- if (n > 0) break;
- unLo++;
- }
- while (True) {
- if (unLo > unHi) break;
- n = ((Int32)block[ptr[unHi]+d]) - med;
- if (n == 0) {
- mswap(ptr[unHi], ptr[gtHi]);
- gtHi--; unHi--; continue;
- };
- if (n < 0) break;
- unHi--;
- }
- if (unLo > unHi) break;
- mswap(ptr[unLo], ptr[unHi]); unLo++; unHi--;
- }
-
- AssertD ( unHi == unLo-1, "mainQSort3(2)" );
-
- if (gtHi < ltLo) {
- mpush(lo, hi, d+1 );
- continue;
- }
-
- n = mmin(ltLo-lo, unLo-ltLo); mvswap(lo, unLo-n, n);
- m = mmin(hi-gtHi, gtHi-unHi); mvswap(unLo, hi-m+1, m);
-
- n = lo + unLo - ltLo - 1;
- m = hi - (gtHi - unHi) + 1;
-
- nextLo[0] = lo; nextHi[0] = n; nextD[0] = d;
- nextLo[1] = m; nextHi[1] = hi; nextD[1] = d;
- nextLo[2] = n+1; nextHi[2] = m-1; nextD[2] = d+1;
-
- if (mnextsize(0) < mnextsize(1)) mnextswap(0,1);
- if (mnextsize(1) < mnextsize(2)) mnextswap(1,2);
- if (mnextsize(0) < mnextsize(1)) mnextswap(0,1);
-
- AssertD (mnextsize(0) >= mnextsize(1), "mainQSort3(8)" );
- AssertD (mnextsize(1) >= mnextsize(2), "mainQSort3(9)" );
-
- mpush (nextLo[0], nextHi[0], nextD[0]);
- mpush (nextLo[1], nextHi[1], nextD[1]);
- mpush (nextLo[2], nextHi[2], nextD[2]);
- }
-}
-
-#undef mswap
-#undef mvswap
-#undef mpush
-#undef mpop
-#undef mmin
-#undef mnextsize
-#undef mnextswap
-#undef MAIN_QSORT_SMALL_THRESH
-#undef MAIN_QSORT_DEPTH_THRESH
-#undef MAIN_QSORT_STACK_SIZE
-
-
-/*---------------------------------------------*/
-/* Pre:
- nblock > N_OVERSHOOT
- block32 exists for [0 .. nblock-1 +N_OVERSHOOT]
- ((UChar*)block32) [0 .. nblock-1] holds block
- ptr exists for [0 .. nblock-1]
-
- Post:
- ((UChar*)block32) [0 .. nblock-1] holds block
- All other areas of block32 destroyed
- ftab [0 .. 65536 ] destroyed
- ptr [0 .. nblock-1] holds sorted order
- if (*budget < 0), sorting was abandoned
-*/
-
-#define BIGFREQ(b) (ftab[((b)+1) << 8] - ftab[(b) << 8])
-#define SETMASK (1 << 21)
-#define CLEARMASK (~(SETMASK))
-
-static
-void mainSort ( UInt32* ptr,
- UChar* block,
- UInt16* quadrant,
- UInt32* ftab,
- Int32 nblock,
- Int32 verb,
- Int32* budget )
-{
- Int32 i, j, k, ss, sb;
- Int32 runningOrder[256];
- Bool bigDone[256];
- Int32 copyStart[256];
- Int32 copyEnd [256];
- UChar c1;
- Int32 numQSorted;
- UInt16 s;
- if (verb >= 4) VPrintf0 ( " main sort initialise ...\n" );
-
- /*-- set up the 2-byte frequency table --*/
- for (i = 65536; i >= 0; i--) ftab[i] = 0;
-
- j = block[0] << 8;
- i = nblock-1;
- for (; i >= 3; i -= 4) {
- quadrant[i] = 0;
- j = (j >> 8) | ( ((UInt16)block[i]) << 8);
- ftab[j]++;
- quadrant[i-1] = 0;
- j = (j >> 8) | ( ((UInt16)block[i-1]) << 8);
- ftab[j]++;
- quadrant[i-2] = 0;
- j = (j >> 8) | ( ((UInt16)block[i-2]) << 8);
- ftab[j]++;
- quadrant[i-3] = 0;
- j = (j >> 8) | ( ((UInt16)block[i-3]) << 8);
- ftab[j]++;
- }
- for (; i >= 0; i--) {
- quadrant[i] = 0;
- j = (j >> 8) | ( ((UInt16)block[i]) << 8);
- ftab[j]++;
- }
-
- /*-- (emphasises close relationship of block & quadrant) --*/
- for (i = 0; i < BZ_N_OVERSHOOT; i++) {
- block [nblock+i] = block[i];
- quadrant[nblock+i] = 0;
- }
-
- if (verb >= 4) VPrintf0 ( " bucket sorting ...\n" );
-
- /*-- Complete the initial radix sort --*/
- for (i = 1; i <= 65536; i++) ftab[i] += ftab[i-1];
-
- s = block[0] << 8;
- i = nblock-1;
- for (; i >= 3; i -= 4) {
- s = (s >> 8) | (block[i] << 8);
- j = ftab[s] -1;
- ftab[s] = j;
- ptr[j] = i;
- s = (s >> 8) | (block[i-1] << 8);
- j = ftab[s] -1;
- ftab[s] = j;
- ptr[j] = i-1;
- s = (s >> 8) | (block[i-2] << 8);
- j = ftab[s] -1;
- ftab[s] = j;
- ptr[j] = i-2;
- s = (s >> 8) | (block[i-3] << 8);
- j = ftab[s] -1;
- ftab[s] = j;
- ptr[j] = i-3;
- }
- for (; i >= 0; i--) {
- s = (s >> 8) | (block[i] << 8);
- j = ftab[s] -1;
- ftab[s] = j;
- ptr[j] = i;
- }
-
- /*--
- Now ftab contains the first loc of every small bucket.
- Calculate the running order, from smallest to largest
- big bucket.
- --*/
- for (i = 0; i <= 255; i++) {
- bigDone [i] = False;
- runningOrder[i] = i;
- }
-
- {
- Int32 vv;
- Int32 h = 1;
- do h = 3 * h + 1; while (h <= 256);
- do {
- h = h / 3;
- for (i = h; i <= 255; i++) {
- vv = runningOrder[i];
- j = i;
- while ( BIGFREQ(runningOrder[j-h]) > BIGFREQ(vv) ) {
- runningOrder[j] = runningOrder[j-h];
- j = j - h;
- if (j <= (h - 1)) goto zero;
- }
- zero:
- runningOrder[j] = vv;
- }
- } while (h != 1);
- }
-
- /*--
- The main sorting loop.
- --*/
-
- numQSorted = 0;
-
- for (i = 0; i <= 255; i++) {
-
- /*--
- Process big buckets, starting with the least full.
- Basically this is a 3-step process in which we call
- mainQSort3 to sort the small buckets [ss, j], but
- also make a big effort to avoid the calls if we can.
- --*/
- ss = runningOrder[i];
-
- /*--
- Step 1:
- Complete the big bucket [ss] by quicksorting
- any unsorted small buckets [ss, j], for j != ss.
- Hopefully previous pointer-scanning phases have already
- completed many of the small buckets [ss, j], so
- we don't have to sort them at all.
- --*/
- for (j = 0; j <= 255; j++) {
- if (j != ss) {
- sb = (ss << 8) + j;
- if ( ! (ftab[sb] & SETMASK) ) {
- Int32 lo = ftab[sb] & CLEARMASK;
- Int32 hi = (ftab[sb+1] & CLEARMASK) - 1;
- if (hi > lo) {
- if (verb >= 4)
- VPrintf4 ( " qsort [0x%x, 0x%x] "
- "done %d this %d\n",
- ss, j, numQSorted, hi - lo + 1 );
- mainQSort3 (
- ptr, block, quadrant, nblock,
- lo, hi, BZ_N_RADIX, budget
- );
- numQSorted += (hi - lo + 1);
- if (*budget < 0) return;
- }
- }
- ftab[sb] |= SETMASK;
- }
- }
-
- AssertH ( !bigDone[ss], 1006 );
-
- /*--
- Step 2:
- Now scan this big bucket [ss] so as to synthesise the
- sorted order for small buckets [t, ss] for all t,
- including, magically, the bucket [ss,ss] too.
- This will avoid doing Real Work in subsequent Step 1's.
- --*/
- {
- for (j = 0; j <= 255; j++) {
- copyStart[j] = ftab[(j << 8) + ss] & CLEARMASK;
- copyEnd [j] = (ftab[(j << 8) + ss + 1] & CLEARMASK) - 1;
- }
- for (j = ftab[ss << 8] & CLEARMASK; j < copyStart[ss]; j++) {
- k = ptr[j]-1; if (k < 0) k += nblock;
- c1 = block[k];
- if (!bigDone[c1])
- ptr[ copyStart[c1]++ ] = k;
- }
- for (j = (ftab[(ss+1) << 8] & CLEARMASK) - 1; j > copyEnd[ss]; j--) {
- k = ptr[j]-1; if (k < 0) k += nblock;
- c1 = block[k];
- if (!bigDone[c1])
- ptr[ copyEnd[c1]-- ] = k;
- }
- }
-
- AssertH ( copyStart[ss]-1 == copyEnd[ss], 1007 );
-
- for (j = 0; j <= 255; j++) ftab[(j << 8) + ss] |= SETMASK;
-
- /*--
- Step 3:
- The [ss] big bucket is now done. Record this fact,
- and update the quadrant descriptors. Remember to
- update quadrants in the overshoot area too, if
- necessary. The "if (i < 255)" test merely skips
- this updating for the last bucket processed, since
- updating for the last bucket is pointless.
-
- The quadrant array provides a way to incrementally
- cache sort orderings, as they appear, so as to
- make subsequent comparisons in fullGtU() complete
- faster. For repetitive blocks this makes a big
- difference (but not big enough to be able to avoid
- the fallback sorting mechanism, exponential radix sort).
-
- The precise meaning is: at all times:
-
- for 0 <= i < nblock and 0 <= j <= nblock
-
- if block[i] != block[j],
-
- then the relative values of quadrant[i] and
- quadrant[j] are meaningless.
-
- else {
- if quadrant[i] < quadrant[j]
- then the string starting at i lexicographically
- precedes the string starting at j
-
- else if quadrant[i] > quadrant[j]
- then the string starting at j lexicographically
- precedes the string starting at i
-
- else
- the relative ordering of the strings starting
- at i and j has not yet been determined.
- }
- --*/
- bigDone[ss] = True;
-
- if (i < 255) {
- Int32 bbStart = ftab[ss << 8] & CLEARMASK;
- Int32 bbSize = (ftab[(ss+1) << 8] & CLEARMASK) - bbStart;
- Int32 shifts = 0;
-
- while ((bbSize >> shifts) > 65534) shifts++;
-
- for (j = bbSize-1; j >= 0; j--) {
- Int32 a2update = ptr[bbStart + j];
- UInt16 qVal = (UInt16)(j >> shifts);
- quadrant[a2update] = qVal;
- if (a2update < BZ_N_OVERSHOOT)
- quadrant[a2update + nblock] = qVal;
- }
- AssertH ( ((bbSize-1) >> shifts) <= 65535, 1002 );
- }
-
- }
-
- if (verb >= 4)
- VPrintf3 ( " %d pointers, %d sorted, %d scanned\n",
- nblock, numQSorted, nblock - numQSorted );
-}
-
-#undef BIGFREQ
-#undef SETMASK
-#undef CLEARMASK
-
-
-/*---------------------------------------------*/
-/* Pre:
- nblock > 0
- arr2 exists for [0 .. nblock-1 +N_OVERSHOOT]
- ((UChar*)arr2) [0 .. nblock-1] holds block
- arr1 exists for [0 .. nblock-1]
-
- Post:
- ((UChar*)arr2) [0 .. nblock-1] holds block
- All other areas of block destroyed
- ftab [ 0 .. 65536 ] destroyed
- arr1 [0 .. nblock-1] holds sorted order
-*/
-void BZ2_blockSort ( EState* s )
-{
- UInt32* ptr = s->ptr;
- UChar* block = s->block;
- UInt32* ftab = s->ftab;
- Int32 nblock = s->nblock;
- Int32 verb = s->verbosity;
- Int32 wfact = s->workFactor;
- UInt16* quadrant;
- Int32 budget;
- Int32 budgetInit;
- Int32 i;
-
- if (nblock < 10000) {
- fallbackSort ( s->arr1, s->arr2, ftab, nblock, verb );
- } else {
- /* Calculate the location for quadrant, remembering to get
- the alignment right. Assumes that &(block[0]) is at least
- 2-byte aligned -- this should be ok since block is really
- the first section of arr2.
- */
- i = nblock+BZ_N_OVERSHOOT;
- if (i & 1) i++;
- quadrant = (UInt16*)(&(block[i]));
-
- /* (wfact-1) / 3 puts the default-factor-30
- transition point at very roughly the same place as
- with v0.1 and v0.9.0.
- Not that it particularly matters any more, since the
- resulting compressed stream is now the same regardless
- of whether or not we use the main sort or fallback sort.
- */
- if (wfact < 1 ) wfact = 1;
- if (wfact > 100) wfact = 100;
- budgetInit = nblock * ((wfact-1) / 3);
- budget = budgetInit;
-
- mainSort ( ptr, block, quadrant, ftab, nblock, verb, &budget );
- if (verb >= 3)
- VPrintf3 ( " %d work, %d block, ratio %5.2f\n",
- budgetInit - budget,
- nblock,
- (float)(budgetInit - budget) /
- (float)(nblock==0 ? 1 : nblock) );
- if (budget < 0) {
- if (verb >= 2)
- VPrintf0 ( " too repetitive; using fallback"
- " sorting algorithm\n" );
- fallbackSort ( s->arr1, s->arr2, ftab, nblock, verb );
- }
- }
-
- s->origPtr = -1;
- for (i = 0; i < s->nblock; i++)
- if (ptr[i] == 0)
- { s->origPtr = i; break; };
-
- AssertH( s->origPtr != -1, 1003 );
-}
-
-
-/*-------------------------------------------------------------*/
-/*--- end blocksort.c ---*/
-/*-------------------------------------------------------------*/
+++ /dev/null
-.PU
-.TH bzip2 1
-.SH NAME
-bzip2, bunzip2 \- a block-sorting file compressor, v1.0
-.br
-bzcat \- decompresses files to stdout
-.br
-bzip2recover \- recovers data from damaged bzip2 files
-
-.SH SYNOPSIS
-.ll +8
-.B bzip2
-.RB [ " \-cdfkqstvzVL123456789 " ]
-[
-.I "filenames \&..."
-]
-.ll -8
-.br
-.B bunzip2
-.RB [ " \-fkvsVL " ]
-[
-.I "filenames \&..."
-]
-.br
-.B bzcat
-.RB [ " \-s " ]
-[
-.I "filenames \&..."
-]
-.br
-.B bzip2recover
-.I "filename"
-
-.SH DESCRIPTION
-.I bzip2
-compresses files using the Burrows-Wheeler block sorting
-text compression algorithm, and Huffman coding. Compression is
-generally considerably better than that achieved by more conventional
-LZ77/LZ78-based compressors, and approaches the performance of the PPM
-family of statistical compressors.
-
-The command-line options are deliberately very similar to
-those of
-.I GNU gzip,
-but they are not identical.
-
-.I bzip2
-expects a list of file names to accompany the
-command-line flags. Each file is replaced by a compressed version of
-itself, with the name "original_name.bz2".
-Each compressed file
-has the same modification date, permissions, and, when possible,
-ownership as the corresponding original, so that these properties can
-be correctly restored at decompression time. File name handling is
-naive in the sense that there is no mechanism for preserving original
-file names, permissions, ownerships or dates in filesystems which lack
-these concepts, or have serious file name length restrictions, such as
-MS-DOS.
-
-.I bzip2
-and
-.I bunzip2
-will by default not overwrite existing
-files. If you want this to happen, specify the \-f flag.
-
-If no file names are specified,
-.I bzip2
-compresses from standard
-input to standard output. In this case,
-.I bzip2
-will decline to
-write compressed output to a terminal, as this would be entirely
-incomprehensible and therefore pointless.
-
-.I bunzip2
-(or
-.I bzip2 \-d)
-decompresses all
-specified files. Files which were not created by
-.I bzip2
-will be detected and ignored, and a warning issued.
-.I bzip2
-attempts to guess the filename for the decompressed file
-from that of the compressed file as follows:
-
- filename.bz2 becomes filename
- filename.bz becomes filename
- filename.tbz2 becomes filename.tar
- filename.tbz becomes filename.tar
- anyothername becomes anyothername.out
-
-If the file does not end in one of the recognised endings,
-.I .bz2,
-.I .bz,
-.I .tbz2
-or
-.I .tbz,
-.I bzip2
-complains that it cannot
-guess the name of the original file, and uses the original name
-with
-.I .out
-appended.
-
-As with compression, supplying no
-filenames causes decompression from
-standard input to standard output.
-
-.I bunzip2
-will correctly decompress a file which is the
-concatenation of two or more compressed files. The result is the
-concatenation of the corresponding uncompressed files. Integrity
-testing (\-t)
-of concatenated
-compressed files is also supported.
-
-You can also compress or decompress files to the standard output by
-giving the \-c flag. Multiple files may be compressed and
-decompressed like this. The resulting outputs are fed sequentially to
-stdout. Compression of multiple files
-in this manner generates a stream
-containing multiple compressed file representations. Such a stream
-can be decompressed correctly only by
-.I bzip2
-version 0.9.0 or
-later. Earlier versions of
-.I bzip2
-will stop after decompressing
-the first file in the stream.
-
-.I bzcat
-(or
-.I bzip2 -dc)
-decompresses all specified files to
-the standard output.
-
-.I bzip2
-will read arguments from the environment variables
-.I BZIP2
-and
-.I BZIP,
-in that order, and will process them
-before any arguments read from the command line. This gives a
-convenient way to supply default arguments.
-
-Compression is always performed, even if the compressed
-file is slightly
-larger than the original. Files of less than about one hundred bytes
-tend to get larger, since the compression mechanism has a constant
-overhead in the region of 50 bytes. Random data (including the output
-of most file compressors) is coded at about 8.05 bits per byte, giving
-an expansion of around 0.5%.
-
-As a self-check for your protection,
-.I
-bzip2
-uses 32-bit CRCs to
-make sure that the decompressed version of a file is identical to the
-original. This guards against corruption of the compressed data, and
-against undetected bugs in
-.I bzip2
-(hopefully very unlikely). The
-chances of data corruption going undetected is microscopic, about one
-chance in four billion for each file processed. Be aware, though, that
-the check occurs upon decompression, so it can only tell you that
-something is wrong. It can't help you
-recover the original uncompressed
-data. You can use
-.I bzip2recover
-to try to recover data from
-damaged files.
-
-Return values: 0 for a normal exit, 1 for environmental problems (file
-not found, invalid flags, I/O errors, &c), 2 to indicate a corrupt
-compressed file, 3 for an internal consistency error (eg, bug) which
-caused
-.I bzip2
-to panic.
-
-.SH OPTIONS
-.TP
-.B \-c --stdout
-Compress or decompress to standard output.
-.TP
-.B \-d --decompress
-Force decompression.
-.I bzip2,
-.I bunzip2
-and
-.I bzcat
-are
-really the same program, and the decision about what actions to take is
-done on the basis of which name is used. This flag overrides that
-mechanism, and forces
-.I bzip2
-to decompress.
-.TP
-.B \-z --compress
-The complement to \-d: forces compression, regardless of the
-invokation name.
-.TP
-.B \-t --test
-Check integrity of the specified file(s), but don't decompress them.
-This really performs a trial decompression and throws away the result.
-.TP
-.B \-f --force
-Force overwrite of output files. Normally,
-.I bzip2
-will not overwrite
-existing output files. Also forces
-.I bzip2
-to break hard links
-to files, which it otherwise wouldn't do.
-.TP
-.B \-k --keep
-Keep (don't delete) input files during compression
-or decompression.
-.TP
-.B \-s --small
-Reduce memory usage, for compression, decompression and testing. Files
-are decompressed and tested using a modified algorithm which only
-requires 2.5 bytes per block byte. This means any file can be
-decompressed in 2300k of memory, albeit at about half the normal speed.
-
-During compression, \-s selects a block size of 200k, which limits
-memory use to around the same figure, at the expense of your compression
-ratio. In short, if your machine is low on memory (8 megabytes or
-less), use \-s for everything. See MEMORY MANAGEMENT below.
-.TP
-.B \-q --quiet
-Suppress non-essential warning messages. Messages pertaining to
-I/O errors and other critical events will not be suppressed.
-.TP
-.B \-v --verbose
-Verbose mode -- show the compression ratio for each file processed.
-Further \-v's increase the verbosity level, spewing out lots of
-information which is primarily of interest for diagnostic purposes.
-.TP
-.B \-L --license -V --version
-Display the software version, license terms and conditions.
-.TP
-.B \-1 to \-9
-Set the block size to 100 k, 200 k .. 900 k when compressing. Has no
-effect when decompressing. See MEMORY MANAGEMENT below.
-.TP
-.B \--
-Treats all subsequent arguments as file names, even if they start
-with a dash. This is so you can handle files with names beginning
-with a dash, for example: bzip2 \-- \-myfilename.
-.TP
-.B \--repetitive-fast --repetitive-best
-These flags are redundant in versions 0.9.5 and above. They provided
-some coarse control over the behaviour of the sorting algorithm in
-earlier versions, which was sometimes useful. 0.9.5 and above have an
-improved algorithm which renders these flags irrelevant.
-
-.SH MEMORY MANAGEMENT
-.I bzip2
-compresses large files in blocks. The block size affects
-both the compression ratio achieved, and the amount of memory needed for
-compression and decompression. The flags \-1 through \-9
-specify the block size to be 100,000 bytes through 900,000 bytes (the
-default) respectively. At decompression time, the block size used for
-compression is read from the header of the compressed file, and
-.I bunzip2
-then allocates itself just enough memory to decompress
-the file. Since block sizes are stored in compressed files, it follows
-that the flags \-1 to \-9 are irrelevant to and so ignored
-during decompression.
-
-Compression and decompression requirements,
-in bytes, can be estimated as:
-
- Compression: 400k + ( 8 x block size )
-
- Decompression: 100k + ( 4 x block size ), or
- 100k + ( 2.5 x block size )
-
-Larger block sizes give rapidly diminishing marginal returns. Most of
-the compression comes from the first two or three hundred k of block
-size, a fact worth bearing in mind when using
-.I bzip2
-on small machines.
-It is also important to appreciate that the decompression memory
-requirement is set at compression time by the choice of block size.
-
-For files compressed with the default 900k block size,
-.I bunzip2
-will require about 3700 kbytes to decompress. To support decompression
-of any file on a 4 megabyte machine,
-.I bunzip2
-has an option to
-decompress using approximately half this amount of memory, about 2300
-kbytes. Decompression speed is also halved, so you should use this
-option only where necessary. The relevant flag is -s.
-
-In general, try and use the largest block size memory constraints allow,
-since that maximises the compression achieved. Compression and
-decompression speed are virtually unaffected by block size.
-
-Another significant point applies to files which fit in a single block
--- that means most files you'd encounter using a large block size. The
-amount of real memory touched is proportional to the size of the file,
-since the file is smaller than a block. For example, compressing a file
-20,000 bytes long with the flag -9 will cause the compressor to
-allocate around 7600k of memory, but only touch 400k + 20000 * 8 = 560
-kbytes of it. Similarly, the decompressor will allocate 3700k but only
-touch 100k + 20000 * 4 = 180 kbytes.
-
-Here is a table which summarises the maximum memory usage for different
-block sizes. Also recorded is the total compressed size for 14 files of
-the Calgary Text Compression Corpus totalling 3,141,622 bytes. This
-column gives some feel for how compression varies with block size.
-These figures tend to understate the advantage of larger block sizes for
-larger files, since the Corpus is dominated by smaller files.
-
- Compress Decompress Decompress Corpus
- Flag usage usage -s usage Size
-
- -1 1200k 500k 350k 914704
- -2 2000k 900k 600k 877703
- -3 2800k 1300k 850k 860338
- -4 3600k 1700k 1100k 846899
- -5 4400k 2100k 1350k 845160
- -6 5200k 2500k 1600k 838626
- -7 6100k 2900k 1850k 834096
- -8 6800k 3300k 2100k 828642
- -9 7600k 3700k 2350k 828642
-
-.SH RECOVERING DATA FROM DAMAGED FILES
-.I bzip2
-compresses files in blocks, usually 900kbytes long. Each
-block is handled independently. If a media or transmission error causes
-a multi-block .bz2
-file to become damaged, it may be possible to
-recover data from the undamaged blocks in the file.
-
-The compressed representation of each block is delimited by a 48-bit
-pattern, which makes it possible to find the block boundaries with
-reasonable certainty. Each block also carries its own 32-bit CRC, so
-damaged blocks can be distinguished from undamaged ones.
-
-.I bzip2recover
-is a simple program whose purpose is to search for
-blocks in .bz2 files, and write each block out into its own .bz2
-file. You can then use
-.I bzip2
-\-t
-to test the
-integrity of the resulting files, and decompress those which are
-undamaged.
-
-.I bzip2recover
-takes a single argument, the name of the damaged file,
-and writes a number of files "rec0001file.bz2",
-"rec0002file.bz2", etc, containing the extracted blocks.
-The output filenames are designed so that the use of
-wildcards in subsequent processing -- for example,
-"bzip2 -dc rec*file.bz2 > recovered_data" -- lists the files in
-the correct order.
-
-.I bzip2recover
-should be of most use dealing with large .bz2
-files, as these will contain many blocks. It is clearly
-futile to use it on damaged single-block files, since a
-damaged block cannot be recovered. If you wish to minimise
-any potential data loss through media or transmission errors,
-you might consider compressing with a smaller
-block size.
-
-.SH PERFORMANCE NOTES
-The sorting phase of compression gathers together similar strings in the
-file. Because of this, files containing very long runs of repeated
-symbols, like "aabaabaabaab ..." (repeated several hundred times) may
-compress more slowly than normal. Versions 0.9.5 and above fare much
-better than previous versions in this respect. The ratio between
-worst-case and average-case compression time is in the region of 10:1.
-For previous versions, this figure was more like 100:1. You can use the
-\-vvvv option to monitor progress in great detail, if you want.
-
-Decompression speed is unaffected by these phenomena.
-
-.I bzip2
-usually allocates several megabytes of memory to operate
-in, and then charges all over it in a fairly random fashion. This means
-that performance, both for compressing and decompressing, is largely
-determined by the speed at which your machine can service cache misses.
-Because of this, small changes to the code to reduce the miss rate have
-been observed to give disproportionately large performance improvements.
-I imagine
-.I bzip2
-will perform best on machines with very large caches.
-
-.SH CAVEATS
-I/O error messages are not as helpful as they could be.
-.I bzip2
-tries hard to detect I/O errors and exit cleanly, but the details of
-what the problem is sometimes seem rather misleading.
-
-This manual page pertains to version 1.0 of
-.I bzip2.
-Compressed
-data created by this version is entirely forwards and backwards
-compatible with the previous public releases, versions 0.1pl2, 0.9.0
-and 0.9.5,
-but with the following exception: 0.9.0 and above can correctly
-decompress multiple concatenated compressed files. 0.1pl2 cannot do
-this; it will stop after decompressing just the first file in the
-stream.
-
-.I bzip2recover
-uses 32-bit integers to represent bit positions in
-compressed files, so it cannot handle compressed files more than 512
-megabytes long. This could easily be fixed.
-
-.SH AUTHOR
-Julian Seward, jseward@acm.org.
-
-http://sourceware.cygnus.com/bzip2
-http://www.muraroa.demon.co.uk
-
-The ideas embodied in
-.I bzip2
-are due to (at least) the following
-people: Michael Burrows and David Wheeler (for the block sorting
-transformation), David Wheeler (again, for the Huffman coder), Peter
-Fenwick (for the structured coding model in the original
-.I bzip,
-and many refinements), and Alistair Moffat, Radford Neal and Ian Witten
-(for the arithmetic coder in the original
-.I bzip).
-I am much
-indebted for their help, support and advice. See the manual in the
-source distribution for pointers to sources of documentation. Christian
-von Roques encouraged me to look for faster sorting algorithms, so as to
-speed up compression. Bela Lubkin encouraged me to improve the
-worst-case compression performance. Many people sent patches, helped
-with portability problems, lent machines, gave advice and were generally
-helpful.
+++ /dev/null
-
-
-
-bzip2(1) bzip2(1)
-
-
-N\bNA\bAM\bME\bE
- bzip2, bunzip2 - a block-sorting file compressor, v1.0
- bzcat - decompresses files to stdout
- bzip2recover - recovers data from damaged bzip2 files
-
-
-S\bSY\bYN\bNO\bOP\bPS\bSI\bIS\bS
- b\bbz\bzi\bip\bp2\b2 [ -\b-c\bcd\bdf\bfk\bkq\bqs\bst\btv\bvz\bzV\bVL\bL1\b12\b23\b34\b45\b56\b67\b78\b89\b9 ] [ _\bf_\bi_\bl_\be_\bn_\ba_\bm_\be_\bs _\b._\b._\b. ]
- b\bbu\bun\bnz\bzi\bip\bp2\b2 [ -\b-f\bfk\bkv\bvs\bsV\bVL\bL ] [ _\bf_\bi_\bl_\be_\bn_\ba_\bm_\be_\bs _\b._\b._\b. ]
- b\bbz\bzc\bca\bat\bt [ -\b-s\bs ] [ _\bf_\bi_\bl_\be_\bn_\ba_\bm_\be_\bs _\b._\b._\b. ]
- b\bbz\bzi\bip\bp2\b2r\bre\bec\bco\bov\bve\ber\br _\bf_\bi_\bl_\be_\bn_\ba_\bm_\be
-
-
-D\bDE\bES\bSC\bCR\bRI\bIP\bPT\bTI\bIO\bON\bN
- _\bb_\bz_\bi_\bp_\b2 compresses files using the Burrows-Wheeler block
- sorting text compression algorithm, and Huffman coding.
- Compression is generally considerably better than that
- achieved by more conventional LZ77/LZ78-based compressors,
- and approaches the performance of the PPM family of sta-
- tistical compressors.
-
- The command-line options are deliberately very similar to
- those of _\bG_\bN_\bU _\bg_\bz_\bi_\bp_\b, but they are not identical.
-
- _\bb_\bz_\bi_\bp_\b2 expects a list of file names to accompany the com-
- mand-line flags. Each file is replaced by a compressed
- version of itself, with the name "original_name.bz2".
- Each compressed file has the same modification date, per-
- missions, and, when possible, ownership as the correspond-
- ing original, so that these properties can be correctly
- restored at decompression time. File name handling is
- naive in the sense that there is no mechanism for preserv-
- ing original file names, permissions, ownerships or dates
- in filesystems which lack these concepts, or have serious
- file name length restrictions, such as MS-DOS.
-
- _\bb_\bz_\bi_\bp_\b2 and _\bb_\bu_\bn_\bz_\bi_\bp_\b2 will by default not overwrite existing
- files. If you want this to happen, specify the -f flag.
-
- If no file names are specified, _\bb_\bz_\bi_\bp_\b2 compresses from
- standard input to standard output. In this case, _\bb_\bz_\bi_\bp_\b2
- will decline to write compressed output to a terminal, as
- this would be entirely incomprehensible and therefore
- pointless.
-
- _\bb_\bu_\bn_\bz_\bi_\bp_\b2 (or _\bb_\bz_\bi_\bp_\b2 _\b-_\bd_\b) decompresses all specified files.
- Files which were not created by _\bb_\bz_\bi_\bp_\b2 will be detected and
- ignored, and a warning issued. _\bb_\bz_\bi_\bp_\b2 attempts to guess
- the filename for the decompressed file from that of the
- compressed file as follows:
-
- filename.bz2 becomes filename
- filename.bz becomes filename
- filename.tbz2 becomes filename.tar
-
-
-
- 1
-
-
-
-
-
-bzip2(1) bzip2(1)
-
-
- filename.tbz becomes filename.tar
- anyothername becomes anyothername.out
-
- If the file does not end in one of the recognised endings,
- _\b._\bb_\bz_\b2_\b, _\b._\bb_\bz_\b, _\b._\bt_\bb_\bz_\b2 or _\b._\bt_\bb_\bz_\b, _\bb_\bz_\bi_\bp_\b2 complains that it cannot
- guess the name of the original file, and uses the original
- name with _\b._\bo_\bu_\bt appended.
-
- As with compression, supplying no filenames causes decom-
- pression from standard input to standard output.
-
- _\bb_\bu_\bn_\bz_\bi_\bp_\b2 will correctly decompress a file which is the con-
- catenation of two or more compressed files. The result is
- the concatenation of the corresponding uncompressed files.
- Integrity testing (-t) of concatenated compressed files is
- also supported.
-
- You can also compress or decompress files to the standard
- output by giving the -c flag. Multiple files may be com-
- pressed and decompressed like this. The resulting outputs
- are fed sequentially to stdout. Compression of multiple
- files in this manner generates a stream containing multi-
- ple compressed file representations. Such a stream can be
- decompressed correctly only by _\bb_\bz_\bi_\bp_\b2 version 0.9.0 or
- later. Earlier versions of _\bb_\bz_\bi_\bp_\b2 will stop after decom-
- pressing the first file in the stream.
-
- _\bb_\bz_\bc_\ba_\bt (or _\bb_\bz_\bi_\bp_\b2 _\b-_\bd_\bc_\b) decompresses all specified files to
- the standard output.
-
- _\bb_\bz_\bi_\bp_\b2 will read arguments from the environment variables
- _\bB_\bZ_\bI_\bP_\b2 and _\bB_\bZ_\bI_\bP_\b, in that order, and will process them
- before any arguments read from the command line. This
- gives a convenient way to supply default arguments.
-
- Compression is always performed, even if the compressed
- file is slightly larger than the original. Files of less
- than about one hundred bytes tend to get larger, since the
- compression mechanism has a constant overhead in the
- region of 50 bytes. Random data (including the output of
- most file compressors) is coded at about 8.05 bits per
- byte, giving an expansion of around 0.5%.
-
- As a self-check for your protection, _\bb_\bz_\bi_\bp_\b2 uses 32-bit
- CRCs to make sure that the decompressed version of a file
- is identical to the original. This guards against corrup-
- tion of the compressed data, and against undetected bugs
- in _\bb_\bz_\bi_\bp_\b2 (hopefully very unlikely). The chances of data
- corruption going undetected is microscopic, about one
- chance in four billion for each file processed. Be aware,
- though, that the check occurs upon decompression, so it
- can only tell you that something is wrong. It can't help
- you recover the original uncompressed data. You can use
- _\bb_\bz_\bi_\bp_\b2_\br_\be_\bc_\bo_\bv_\be_\br to try to recover data from damaged files.
-
-
-
- 2
-
-
-
-
-
-bzip2(1) bzip2(1)
-
-
- Return values: 0 for a normal exit, 1 for environmental
- problems (file not found, invalid flags, I/O errors, &c),
- 2 to indicate a corrupt compressed file, 3 for an internal
- consistency error (eg, bug) which caused _\bb_\bz_\bi_\bp_\b2 to panic.
-
-
-O\bOP\bPT\bTI\bIO\bON\bNS\bS
- -\b-c\bc -\b--\b-s\bst\btd\bdo\bou\but\bt
- Compress or decompress to standard output.
-
- -\b-d\bd -\b--\b-d\bde\bec\bco\bom\bmp\bpr\bre\bes\bss\bs
- Force decompression. _\bb_\bz_\bi_\bp_\b2_\b, _\bb_\bu_\bn_\bz_\bi_\bp_\b2 and _\bb_\bz_\bc_\ba_\bt are
- really the same program, and the decision about
- what actions to take is done on the basis of which
- name is used. This flag overrides that mechanism,
- and forces _\bb_\bz_\bi_\bp_\b2 to decompress.
-
- -\b-z\bz -\b--\b-c\bco\bom\bmp\bpr\bre\bes\bss\bs
- The complement to -d: forces compression, regard-
- less of the invokation name.
-
- -\b-t\bt -\b--\b-t\bte\bes\bst\bt
- Check integrity of the specified file(s), but don't
- decompress them. This really performs a trial
- decompression and throws away the result.
-
- -\b-f\bf -\b--\b-f\bfo\bor\brc\bce\be
- Force overwrite of output files. Normally, _\bb_\bz_\bi_\bp_\b2
- will not overwrite existing output files. Also
- forces _\bb_\bz_\bi_\bp_\b2 to break hard links to files, which it
- otherwise wouldn't do.
-
- -\b-k\bk -\b--\b-k\bke\bee\bep\bp
- Keep (don't delete) input files during compression
- or decompression.
-
- -\b-s\bs -\b--\b-s\bsm\bma\bal\bll\bl
- Reduce memory usage, for compression, decompression
- and testing. Files are decompressed and tested
- using a modified algorithm which only requires 2.5
- bytes per block byte. This means any file can be
- decompressed in 2300k of memory, albeit at about
- half the normal speed.
-
- During compression, -s selects a block size of
- 200k, which limits memory use to around the same
- figure, at the expense of your compression ratio.
- In short, if your machine is low on memory (8
- megabytes or less), use -s for everything. See
- MEMORY MANAGEMENT below.
-
- -\b-q\bq -\b--\b-q\bqu\bui\bie\bet\bt
- Suppress non-essential warning messages. Messages
- pertaining to I/O errors and other critical events
-
-
-
- 3
-
-
-
-
-
-bzip2(1) bzip2(1)
-
-
- will not be suppressed.
-
- -\b-v\bv -\b--\b-v\bve\ber\brb\bbo\bos\bse\be
- Verbose mode -- show the compression ratio for each
- file processed. Further -v's increase the ver-
- bosity level, spewing out lots of information which
- is primarily of interest for diagnostic purposes.
-
- -\b-L\bL -\b--\b-l\bli\bic\bce\ben\bns\bse\be -\b-V\bV -\b--\b-v\bve\ber\brs\bsi\bio\bon\bn
- Display the software version, license terms and
- conditions.
-
- -\b-1\b1 t\bto\bo -\b-9\b9
- Set the block size to 100 k, 200 k .. 900 k when
- compressing. Has no effect when decompressing.
- See MEMORY MANAGEMENT below.
-
- -\b--\b- Treats all subsequent arguments as file names, even
- if they start with a dash. This is so you can han-
- dle files with names beginning with a dash, for
- example: bzip2 -- -myfilename.
-
- -\b--\b-r\bre\bep\bpe\bet\bti\bit\bti\biv\bve\be-\b-f\bfa\bas\bst\bt -\b--\b-r\bre\bep\bpe\bet\bti\bit\bti\biv\bve\be-\b-b\bbe\bes\bst\bt
- These flags are redundant in versions 0.9.5 and
- above. They provided some coarse control over the
- behaviour of the sorting algorithm in earlier ver-
- sions, which was sometimes useful. 0.9.5 and above
- have an improved algorithm which renders these
- flags irrelevant.
-
-
-M\bME\bEM\bMO\bOR\bRY\bY M\bMA\bAN\bNA\bAG\bGE\bEM\bME\bEN\bNT\bT
- _\bb_\bz_\bi_\bp_\b2 compresses large files in blocks. The block size
- affects both the compression ratio achieved, and the
- amount of memory needed for compression and decompression.
- The flags -1 through -9 specify the block size to be
- 100,000 bytes through 900,000 bytes (the default) respec-
- tively. At decompression time, the block size used for
- compression is read from the header of the compressed
- file, and _\bb_\bu_\bn_\bz_\bi_\bp_\b2 then allocates itself just enough memory
- to decompress the file. Since block sizes are stored in
- compressed files, it follows that the flags -1 to -9 are
- irrelevant to and so ignored during decompression.
-
- Compression and decompression requirements, in bytes, can
- be estimated as:
-
- Compression: 400k + ( 8 x block size )
-
- Decompression: 100k + ( 4 x block size ), or
- 100k + ( 2.5 x block size )
-
- Larger block sizes give rapidly diminishing marginal
- returns. Most of the compression comes from the first two
-
-
-
- 4
-
-
-
-
-
-bzip2(1) bzip2(1)
-
-
- or three hundred k of block size, a fact worth bearing in
- mind when using _\bb_\bz_\bi_\bp_\b2 on small machines. It is also
- important to appreciate that the decompression memory
- requirement is set at compression time by the choice of
- block size.
-
- For files compressed with the default 900k block size,
- _\bb_\bu_\bn_\bz_\bi_\bp_\b2 will require about 3700 kbytes to decompress. To
- support decompression of any file on a 4 megabyte machine,
- _\bb_\bu_\bn_\bz_\bi_\bp_\b2 has an option to decompress using approximately
- half this amount of memory, about 2300 kbytes. Decompres-
- sion speed is also halved, so you should use this option
- only where necessary. The relevant flag is -s.
-
- In general, try and use the largest block size memory con-
- straints allow, since that maximises the compression
- achieved. Compression and decompression speed are virtu-
- ally unaffected by block size.
-
- Another significant point applies to files which fit in a
- single block -- that means most files you'd encounter
- using a large block size. The amount of real memory
- touched is proportional to the size of the file, since the
- file is smaller than a block. For example, compressing a
- file 20,000 bytes long with the flag -9 will cause the
- compressor to allocate around 7600k of memory, but only
- touch 400k + 20000 * 8 = 560 kbytes of it. Similarly, the
- decompressor will allocate 3700k but only touch 100k +
- 20000 * 4 = 180 kbytes.
-
- Here is a table which summarises the maximum memory usage
- for different block sizes. Also recorded is the total
- compressed size for 14 files of the Calgary Text Compres-
- sion Corpus totalling 3,141,622 bytes. This column gives
- some feel for how compression varies with block size.
- These figures tend to understate the advantage of larger
- block sizes for larger files, since the Corpus is domi-
- nated by smaller files.
-
- Compress Decompress Decompress Corpus
- Flag usage usage -s usage Size
-
- -1 1200k 500k 350k 914704
- -2 2000k 900k 600k 877703
- -3 2800k 1300k 850k 860338
- -4 3600k 1700k 1100k 846899
- -5 4400k 2100k 1350k 845160
- -6 5200k 2500k 1600k 838626
- -7 6100k 2900k 1850k 834096
- -8 6800k 3300k 2100k 828642
- -9 7600k 3700k 2350k 828642
-
-
-
-
-
-
- 5
-
-
-
-
-
-bzip2(1) bzip2(1)
-
-
-R\bRE\bEC\bCO\bOV\bVE\bER\bRI\bIN\bNG\bG D\bDA\bAT\bTA\bA F\bFR\bRO\bOM\bM D\bDA\bAM\bMA\bAG\bGE\bED\bD F\bFI\bIL\bLE\bES\bS
- _\bb_\bz_\bi_\bp_\b2 compresses files in blocks, usually 900kbytes long.
- Each block is handled independently. If a media or trans-
- mission error causes a multi-block .bz2 file to become
- damaged, it may be possible to recover data from the
- undamaged blocks in the file.
-
- The compressed representation of each block is delimited
- by a 48-bit pattern, which makes it possible to find the
- block boundaries with reasonable certainty. Each block
- also carries its own 32-bit CRC, so damaged blocks can be
- distinguished from undamaged ones.
-
- _\bb_\bz_\bi_\bp_\b2_\br_\be_\bc_\bo_\bv_\be_\br is a simple program whose purpose is to
- search for blocks in .bz2 files, and write each block out
- into its own .bz2 file. You can then use _\bb_\bz_\bi_\bp_\b2 -t to test
- the integrity of the resulting files, and decompress those
- which are undamaged.
-
- _\bb_\bz_\bi_\bp_\b2_\br_\be_\bc_\bo_\bv_\be_\br takes a single argument, the name of the dam-
- aged file, and writes a number of files "rec0001file.bz2",
- "rec0002file.bz2", etc, containing the extracted blocks.
- The output filenames are designed so that the use of
- wildcards in subsequent processing -- for example, "bzip2
- -dc rec*file.bz2 > recovered_data" -- lists the files in
- the correct order.
-
- _\bb_\bz_\bi_\bp_\b2_\br_\be_\bc_\bo_\bv_\be_\br should be of most use dealing with large .bz2
- files, as these will contain many blocks. It is clearly
- futile to use it on damaged single-block files, since a
- damaged block cannot be recovered. If you wish to min-
- imise any potential data loss through media or transmis-
- sion errors, you might consider compressing with a smaller
- block size.
-
-
-P\bPE\bER\bRF\bFO\bOR\bRM\bMA\bAN\bNC\bCE\bE N\bNO\bOT\bTE\bES\bS
- The sorting phase of compression gathers together similar
- strings in the file. Because of this, files containing
- very long runs of repeated symbols, like "aabaabaabaab
- ..." (repeated several hundred times) may compress more
- slowly than normal. Versions 0.9.5 and above fare much
- better than previous versions in this respect. The ratio
- between worst-case and average-case compression time is in
- the region of 10:1. For previous versions, this figure
- was more like 100:1. You can use the -vvvv option to mon-
- itor progress in great detail, if you want.
-
- Decompression speed is unaffected by these phenomena.
-
- _\bb_\bz_\bi_\bp_\b2 usually allocates several megabytes of memory to
- operate in, and then charges all over it in a fairly ran-
- dom fashion. This means that performance, both for com-
- pressing and decompressing, is largely determined by the
-
-
-
- 6
-
-
-
-
-
-bzip2(1) bzip2(1)
-
-
- speed at which your machine can service cache misses.
- Because of this, small changes to the code to reduce the
- miss rate have been observed to give disproportionately
- large performance improvements. I imagine _\bb_\bz_\bi_\bp_\b2 will per-
- form best on machines with very large caches.
-
-
-C\bCA\bAV\bVE\bEA\bAT\bTS\bS
- I/O error messages are not as helpful as they could be.
- _\bb_\bz_\bi_\bp_\b2 tries hard to detect I/O errors and exit cleanly,
- but the details of what the problem is sometimes seem
- rather misleading.
-
- This manual page pertains to version 1.0 of _\bb_\bz_\bi_\bp_\b2_\b. Com-
- pressed data created by this version is entirely forwards
- and backwards compatible with the previous public
- releases, versions 0.1pl2, 0.9.0 and 0.9.5, but with the
- following exception: 0.9.0 and above can correctly decom-
- press multiple concatenated compressed files. 0.1pl2 can-
- not do this; it will stop after decompressing just the
- first file in the stream.
-
- _\bb_\bz_\bi_\bp_\b2_\br_\be_\bc_\bo_\bv_\be_\br uses 32-bit integers to represent bit posi-
- tions in compressed files, so it cannot handle compressed
- files more than 512 megabytes long. This could easily be
- fixed.
-
-
-A\bAU\bUT\bTH\bHO\bOR\bR
- Julian Seward, jseward@acm.org.
-
- http://sourceware.cygnus.com/bzip2
- http://www.muraroa.demon.co.uk
-
- The ideas embodied in _\bb_\bz_\bi_\bp_\b2 are due to (at least) the fol-
- lowing people: Michael Burrows and David Wheeler (for the
- block sorting transformation), David Wheeler (again, for
- the Huffman coder), Peter Fenwick (for the structured cod-
- ing model in the original _\bb_\bz_\bi_\bp_\b, and many refinements), and
- Alistair Moffat, Radford Neal and Ian Witten (for the
- arithmetic coder in the original _\bb_\bz_\bi_\bp_\b)_\b. I am much
- indebted for their help, support and advice. See the man-
- ual in the source distribution for pointers to sources of
- documentation. Christian von Roques encouraged me to look
- for faster sorting algorithms, so as to speed up compres-
- sion. Bela Lubkin encouraged me to improve the worst-case
- compression performance. Many people sent patches, helped
- with portability problems, lent machines, gave advice and
- were generally helpful.
-
-
-
-
-
-
-
-
- 7
-
-
+++ /dev/null
-
-/*-----------------------------------------------------------*/
-/*--- A block-sorting, lossless compressor bzip2.c ---*/
-/*-----------------------------------------------------------*/
-
-/*--
- This file is a part of bzip2 and/or libbzip2, a program and
- library for lossless, block-sorting data compression.
-
- Copyright (C) 1996-2000 Julian R Seward. All rights reserved.
-
- Redistribution and use in source and binary forms, with or without
- modification, are permitted provided that the following conditions
- are met:
-
- 1. Redistributions of source code must retain the above copyright
- notice, this list of conditions and the following disclaimer.
-
- 2. The origin of this software must not be misrepresented; you must
- not claim that you wrote the original software. If you use this
- software in a product, an acknowledgment in the product
- documentation would be appreciated but is not required.
-
- 3. Altered source versions must be plainly marked as such, and must
- not be misrepresented as being the original software.
-
- 4. The name of the author may not be used to endorse or promote
- products derived from this software without specific prior written
- permission.
-
- THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
- OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
- DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
- GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
- Julian Seward, Cambridge, UK.
- jseward@acm.org
- bzip2/libbzip2 version 1.0 of 21 March 2000
-
- This program is based on (at least) the work of:
- Mike Burrows
- David Wheeler
- Peter Fenwick
- Alistair Moffat
- Radford Neal
- Ian H. Witten
- Robert Sedgewick
- Jon L. Bentley
-
- For more information on these sources, see the manual.
---*/
-
-
-/*----------------------------------------------------*/
-/*--- IMPORTANT ---*/
-/*----------------------------------------------------*/
-
-/*--
- WARNING:
- This program and library (attempts to) compress data by
- performing several non-trivial transformations on it.
- Unless you are 100% familiar with *all* the algorithms
- contained herein, and with the consequences of modifying them,
- you should NOT meddle with the compression or decompression
- machinery. Incorrect changes can and very likely *will*
- lead to disasterous loss of data.
-
- DISCLAIMER:
- I TAKE NO RESPONSIBILITY FOR ANY LOSS OF DATA ARISING FROM THE
- USE OF THIS PROGRAM, HOWSOEVER CAUSED.
-
- Every compression of a file implies an assumption that the
- compressed file can be decompressed to reproduce the original.
- Great efforts in design, coding and testing have been made to
- ensure that this program works correctly. However, the
- complexity of the algorithms, and, in particular, the presence
- of various special cases in the code which occur with very low
- but non-zero probability make it impossible to rule out the
- possibility of bugs remaining in the program. DO NOT COMPRESS
- ANY DATA WITH THIS PROGRAM AND/OR LIBRARY UNLESS YOU ARE PREPARED
- TO ACCEPT THE POSSIBILITY, HOWEVER SMALL, THAT THE DATA WILL
- NOT BE RECOVERABLE.
-
- That is not to say this program is inherently unreliable.
- Indeed, I very much hope the opposite is true. bzip2/libbzip2
- has been carefully constructed and extensively tested.
-
- PATENTS:
- To the best of my knowledge, bzip2/libbzip2 does not use any
- patented algorithms. However, I do not have the resources
- available to carry out a full patent search. Therefore I cannot
- give any guarantee of the above statement.
---*/
-
-
-
-/*----------------------------------------------------*/
-/*--- and now for something much more pleasant :-) ---*/
-/*----------------------------------------------------*/
-
-/*---------------------------------------------*/
-/*--
- Place a 1 beside your platform, and 0 elsewhere.
---*/
-
-/*--
- Generic 32-bit Unix.
- Also works on 64-bit Unix boxes.
---*/
-#define BZ_UNIX 1
-
-/*--
- Win32, as seen by Jacob Navia's excellent
- port of (Chris Fraser & David Hanson)'s excellent
- lcc compiler.
---*/
-#define BZ_LCCWIN32 0
-
-#if defined(_WIN32) && !defined(__CYGWIN__)
-#undef BZ_LCCWIN32
-#define BZ_LCCWIN32 1
-#undef BZ_UNIX
-#define BZ_UNIX 0
-#endif
-
-
-/*---------------------------------------------*/
-/*--
- Some stuff for all platforms.
---*/
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <signal.h>
-#include <math.h>
-#include <errno.h>
-#include <ctype.h>
-#include "bzlib.h"
-
-#define ERROR_IF_EOF(i) { if ((i) == EOF) ioError(); }
-#define ERROR_IF_NOT_ZERO(i) { if ((i) != 0) ioError(); }
-#define ERROR_IF_MINUS_ONE(i) { if ((i) == (-1)) ioError(); }
-
-
-/*---------------------------------------------*/
-/*--
- Platform-specific stuff.
---*/
-
-#if BZ_UNIX
-# include <sys/types.h>
-# include <utime.h>
-# include <unistd.h>
-# include <sys/stat.h>
-# include <sys/times.h>
-
-# define PATH_SEP '/'
-# define MY_LSTAT lstat
-# define MY_S_IFREG S_ISREG
-# define MY_STAT stat
-
-# define APPEND_FILESPEC(root, name) \
- root=snocString((root), (name))
-
-# define APPEND_FLAG(root, name) \
- root=snocString((root), (name))
-
-# define SET_BINARY_MODE(fd) /**/
-
-# ifdef __GNUC__
-# define NORETURN __attribute__ ((noreturn))
-# else
-# define NORETURN /**/
-# endif
-# ifdef __DJGPP__
-# include <io.h>
-# include <fcntl.h>
-# undef MY_LSTAT
-# define MY_LSTAT stat
-# undef SET_BINARY_MODE
-# define SET_BINARY_MODE(fd) \
- do { \
- int retVal = setmode ( fileno ( fd ), \
- O_BINARY ); \
- ERROR_IF_MINUS_ONE ( retVal ); \
- } while ( 0 )
-# endif
-# ifdef __CYGWIN__
-# include <io.h>
-# include <fcntl.h>
-# undef SET_BINARY_MODE
-# define SET_BINARY_MODE(fd) \
- do { \
- int retVal = setmode ( fileno ( fd ), \
- O_BINARY ); \
- ERROR_IF_MINUS_ONE ( retVal ); \
- } while ( 0 )
-# endif
-#endif
-
-
-
-#if BZ_LCCWIN32
-# include <io.h>
-# include <fcntl.h>
-# include <sys\stat.h>
-
-# define NORETURN /**/
-# define PATH_SEP '\\'
-# define MY_LSTAT _stat
-# define MY_STAT _stat
-# define MY_S_IFREG(x) ((x) & _S_IFREG)
-
-# define APPEND_FLAG(root, name) \
- root=snocString((root), (name))
-
-# if 0
- /*-- lcc-win32 seems to expand wildcards itself --*/
-# define APPEND_FILESPEC(root, spec) \
- do { \
- if ((spec)[0] == '-') { \
- root = snocString((root), (spec)); \
- } else { \
- struct _finddata_t c_file; \
- long hFile; \
- hFile = _findfirst((spec), &c_file); \
- if ( hFile == -1L ) { \
- root = snocString ((root), (spec)); \
- } else { \
- int anInt = 0; \
- while ( anInt == 0 ) { \
- root = snocString((root), \
- &c_file.name[0]); \
- anInt = _findnext(hFile, &c_file); \
- } \
- } \
- } \
- } while ( 0 )
-# else
-# define APPEND_FILESPEC(root, name) \
- root = snocString ((root), (name))
-# endif
-
-# define SET_BINARY_MODE(fd) \
- do { \
- int retVal = setmode ( fileno ( fd ), \
- O_BINARY ); \
- ERROR_IF_MINUS_ONE ( retVal ); \
- } while ( 0 )
-
-#endif
-
-
-/*---------------------------------------------*/
-/*--
- Some more stuff for all platforms :-)
---*/
-
-typedef char Char;
-typedef unsigned char Bool;
-typedef unsigned char UChar;
-typedef int Int32;
-typedef unsigned int UInt32;
-typedef short Int16;
-typedef unsigned short UInt16;
-
-#define True ((Bool)1)
-#define False ((Bool)0)
-
-/*--
- IntNative is your platform's `native' int size.
- Only here to avoid probs with 64-bit platforms.
---*/
-typedef int IntNative;
-
-
-/*---------------------------------------------------*/
-/*--- Misc (file handling) data decls ---*/
-/*---------------------------------------------------*/
-
-Int32 verbosity;
-Bool keepInputFiles, smallMode, deleteOutputOnInterrupt;
-Bool forceOverwrite, testFailsExist, unzFailsExist, noisy;
-Int32 numFileNames, numFilesProcessed, blockSize100k;
-Int32 exitValue;
-
-/*-- source modes; F==file, I==stdin, O==stdout --*/
-#define SM_I2O 1
-#define SM_F2O 2
-#define SM_F2F 3
-
-/*-- operation modes --*/
-#define OM_Z 1
-#define OM_UNZ 2
-#define OM_TEST 3
-
-Int32 opMode;
-Int32 srcMode;
-
-#define FILE_NAME_LEN 1034
-
-Int32 longestFileName;
-Char inName [FILE_NAME_LEN];
-Char outName[FILE_NAME_LEN];
-Char tmpName[FILE_NAME_LEN];
-Char *progName;
-Char progNameReally[FILE_NAME_LEN];
-FILE *outputHandleJustInCase;
-Int32 workFactor;
-
-static void panic ( Char* ) NORETURN;
-static void ioError ( void ) NORETURN;
-static void outOfMemory ( void ) NORETURN;
-static void configError ( void ) NORETURN;
-static void crcError ( void ) NORETURN;
-static void cleanUpAndFail ( Int32 ) NORETURN;
-static void compressedStreamEOF ( void ) NORETURN;
-
-static void copyFileName ( Char*, Char* );
-static void* myMalloc ( Int32 );
-
-
-
-/*---------------------------------------------------*/
-/*--- An implementation of 64-bit ints. Sigh. ---*/
-/*--- Roll on widespread deployment of ANSI C9X ! ---*/
-/*---------------------------------------------------*/
-
-typedef
- struct { UChar b[8]; }
- UInt64;
-
-static
-void uInt64_from_UInt32s ( UInt64* n, UInt32 lo32, UInt32 hi32 )
-{
- n->b[7] = (UChar)((hi32 >> 24) & 0xFF);
- n->b[6] = (UChar)((hi32 >> 16) & 0xFF);
- n->b[5] = (UChar)((hi32 >> 8) & 0xFF);
- n->b[4] = (UChar) (hi32 & 0xFF);
- n->b[3] = (UChar)((lo32 >> 24) & 0xFF);
- n->b[2] = (UChar)((lo32 >> 16) & 0xFF);
- n->b[1] = (UChar)((lo32 >> 8) & 0xFF);
- n->b[0] = (UChar) (lo32 & 0xFF);
-}
-
-static
-double uInt64_to_double ( UInt64* n )
-{
- Int32 i;
- double base = 1.0;
- double sum = 0.0;
- for (i = 0; i < 8; i++) {
- sum += base * (double)(n->b[i]);
- base *= 256.0;
- }
- return sum;
-}
-
-static
-void uInt64_add ( UInt64* src, UInt64* dst )
-{
- Int32 i;
- Int32 carry = 0;
- for (i = 0; i < 8; i++) {
- carry += ( ((Int32)src->b[i]) + ((Int32)dst->b[i]) );
- dst->b[i] = (UChar)(carry & 0xFF);
- carry >>= 8;
- }
-}
-
-static
-void uInt64_sub ( UInt64* src, UInt64* dst )
-{
- Int32 t, i;
- Int32 borrow = 0;
- for (i = 0; i < 8; i++) {
- t = ((Int32)dst->b[i]) - ((Int32)src->b[i]) - borrow;
- if (t < 0) {
- dst->b[i] = (UChar)(t + 256);
- borrow = 1;
- } else {
- dst->b[i] = (UChar)t;
- borrow = 0;
- }
- }
-}
-
-static
-void uInt64_mul ( UInt64* a, UInt64* b, UInt64* r_hi, UInt64* r_lo )
-{
- UChar sum[16];
- Int32 ia, ib, carry;
- for (ia = 0; ia < 16; ia++) sum[ia] = 0;
- for (ia = 0; ia < 8; ia++) {
- carry = 0;
- for (ib = 0; ib < 8; ib++) {
- carry += ( ((Int32)sum[ia+ib])
- + ((Int32)a->b[ia]) * ((Int32)b->b[ib]) );
- sum[ia+ib] = (UChar)(carry & 0xFF);
- carry >>= 8;
- }
- sum[ia+8] = (UChar)(carry & 0xFF);
- if ((carry >>= 8) != 0) panic ( "uInt64_mul" );
- }
-
- for (ia = 0; ia < 8; ia++) r_hi->b[ia] = sum[ia+8];
- for (ia = 0; ia < 8; ia++) r_lo->b[ia] = sum[ia];
-}
-
-
-static
-void uInt64_shr1 ( UInt64* n )
-{
- Int32 i;
- for (i = 0; i < 8; i++) {
- n->b[i] >>= 1;
- if (i < 7 && (n->b[i+1] & 1)) n->b[i] |= 0x80;
- }
-}
-
-static
-void uInt64_shl1 ( UInt64* n )
-{
- Int32 i;
- for (i = 7; i >= 0; i--) {
- n->b[i] <<= 1;
- if (i > 0 && (n->b[i-1] & 0x80)) n->b[i]++;
- }
-}
-
-static
-Bool uInt64_isZero ( UInt64* n )
-{
- Int32 i;
- for (i = 0; i < 8; i++)
- if (n->b[i] != 0) return 0;
- return 1;
-}
-
-static
-Int32 uInt64_qrm10 ( UInt64* n )
-{
- /* Divide *n by 10, and return the remainder. Long division
- is difficult, so we cheat and instead multiply by
- 0xCCCC CCCC CCCC CCCD, which is 0.8 (viz, 0.1 << 3).
- */
- Int32 i;
- UInt64 tmp1, tmp2, n_orig, zero_point_eight;
-
- zero_point_eight.b[1] = zero_point_eight.b[2] =
- zero_point_eight.b[3] = zero_point_eight.b[4] =
- zero_point_eight.b[5] = zero_point_eight.b[6] =
- zero_point_eight.b[7] = 0xCC;
- zero_point_eight.b[0] = 0xCD;
-
- n_orig = *n;
-
- /* divide n by 10,
- by multiplying by 0.8 and then shifting right 3 times */
- uInt64_mul ( n, &zero_point_eight, &tmp1, &tmp2 );
- uInt64_shr1(&tmp1); uInt64_shr1(&tmp1); uInt64_shr1(&tmp1);
- *n = tmp1;
-
- /* tmp1 = 8*n, tmp2 = 2*n */
- uInt64_shl1(&tmp1); uInt64_shl1(&tmp1); uInt64_shl1(&tmp1);
- tmp2 = *n; uInt64_shl1(&tmp2);
-
- /* tmp1 = 10*n */
- uInt64_add ( &tmp2, &tmp1 );
-
- /* n_orig = n_orig - 10*n */
- uInt64_sub ( &tmp1, &n_orig );
-
- /* n_orig should now hold quotient, in range 0 .. 9 */
- for (i = 7; i >= 1; i--)
- if (n_orig.b[i] != 0) panic ( "uInt64_qrm10(1)" );
- if (n_orig.b[0] > 9)
- panic ( "uInt64_qrm10(2)" );
-
- return (int)n_orig.b[0];
-}
-
-/* ... and the Whole Entire Point of all this UInt64 stuff is
- so that we can supply the following function.
-*/
-static
-void uInt64_toAscii ( char* outbuf, UInt64* n )
-{
- Int32 i, q;
- UChar buf[32];
- Int32 nBuf = 0;
- UInt64 n_copy = *n;
- do {
- q = uInt64_qrm10 ( &n_copy );
- buf[nBuf] = q + '0';
- nBuf++;
- } while (!uInt64_isZero(&n_copy));
- outbuf[nBuf] = 0;
- for (i = 0; i < nBuf; i++) outbuf[i] = buf[nBuf-i-1];
-}
-
-
-/*---------------------------------------------------*/
-/*--- Processing of complete files and streams ---*/
-/*---------------------------------------------------*/
-
-/*---------------------------------------------*/
-static
-Bool myfeof ( FILE* f )
-{
- Int32 c = fgetc ( f );
- if (c == EOF) return True;
- ungetc ( c, f );
- return False;
-}
-
-
-/*---------------------------------------------*/
-static
-void compressStream ( FILE *stream, FILE *zStream )
-{
- BZFILE* bzf = NULL;
- UChar ibuf[5000];
- Int32 nIbuf;
- UInt32 nbytes_in_lo32, nbytes_in_hi32;
- UInt32 nbytes_out_lo32, nbytes_out_hi32;
- Int32 bzerr, bzerr_dummy, ret;
-
- SET_BINARY_MODE(stream);
- SET_BINARY_MODE(zStream);
-
- if (ferror(stream)) goto errhandler_io;
- if (ferror(zStream)) goto errhandler_io;
-
- bzf = BZ2_bzWriteOpen ( &bzerr, zStream,
- blockSize100k, verbosity, workFactor );
- if (bzerr != BZ_OK) goto errhandler;
-
- if (verbosity >= 2) fprintf ( stderr, "\n" );
-
- while (True) {
-
- if (myfeof(stream)) break;
- nIbuf = fread ( ibuf, sizeof(UChar), 5000, stream );
- if (ferror(stream)) goto errhandler_io;
- if (nIbuf > 0) BZ2_bzWrite ( &bzerr, bzf, (void*)ibuf, nIbuf );
- if (bzerr != BZ_OK) goto errhandler;
-
- }
-
- BZ2_bzWriteClose64 ( &bzerr, bzf, 0,
- &nbytes_in_lo32, &nbytes_in_hi32,
- &nbytes_out_lo32, &nbytes_out_hi32 );
- if (bzerr != BZ_OK) goto errhandler;
-
- if (ferror(zStream)) goto errhandler_io;
- ret = fflush ( zStream );
- if (ret == EOF) goto errhandler_io;
- if (zStream != stdout) {
- ret = fclose ( zStream );
- if (ret == EOF) goto errhandler_io;
- }
- if (ferror(stream)) goto errhandler_io;
- ret = fclose ( stream );
- if (ret == EOF) goto errhandler_io;
-
- if (nbytes_in_lo32 == 0 && nbytes_in_hi32 == 0)
- nbytes_in_lo32 = 1;
-
- if (verbosity >= 1) {
- Char buf_nin[32], buf_nout[32];
- UInt64 nbytes_in, nbytes_out;
- double nbytes_in_d, nbytes_out_d;
- uInt64_from_UInt32s ( &nbytes_in,
- nbytes_in_lo32, nbytes_in_hi32 );
- uInt64_from_UInt32s ( &nbytes_out,
- nbytes_out_lo32, nbytes_out_hi32 );
- nbytes_in_d = uInt64_to_double ( &nbytes_in );
- nbytes_out_d = uInt64_to_double ( &nbytes_out );
- uInt64_toAscii ( buf_nin, &nbytes_in );
- uInt64_toAscii ( buf_nout, &nbytes_out );
- fprintf ( stderr, "%6.3f:1, %6.3f bits/byte, "
- "%5.2f%% saved, %s in, %s out.\n",
- nbytes_in_d / nbytes_out_d,
- (8.0 * nbytes_out_d) / nbytes_in_d,
- 100.0 * (1.0 - nbytes_out_d / nbytes_in_d),
- buf_nin,
- buf_nout
- );
- }
-
- return;
-
- errhandler:
- BZ2_bzWriteClose64 ( &bzerr_dummy, bzf, 1,
- &nbytes_in_lo32, &nbytes_in_hi32,
- &nbytes_out_lo32, &nbytes_out_hi32 );
- switch (bzerr) {
- case BZ_CONFIG_ERROR:
- configError(); break;
- case BZ_MEM_ERROR:
- outOfMemory (); break;
- case BZ_IO_ERROR:
- errhandler_io:
- ioError(); break;
- default:
- panic ( "compress:unexpected error" );
- }
-
- panic ( "compress:end" );
- /*notreached*/
-}
-
-
-
-/*---------------------------------------------*/
-static
-Bool uncompressStream ( FILE *zStream, FILE *stream )
-{
- BZFILE* bzf = NULL;
- Int32 bzerr, bzerr_dummy, ret, nread, streamNo, i;
- UChar obuf[5000];
- UChar unused[BZ_MAX_UNUSED];
- Int32 nUnused;
- UChar* unusedTmp;
-
- nUnused = 0;
- streamNo = 0;
-
- SET_BINARY_MODE(stream);
- SET_BINARY_MODE(zStream);
-
- if (ferror(stream)) goto errhandler_io;
- if (ferror(zStream)) goto errhandler_io;
-
- while (True) {
-
- bzf = BZ2_bzReadOpen (
- &bzerr, zStream, verbosity,
- (int)smallMode, unused, nUnused
- );
- if (bzf == NULL || bzerr != BZ_OK) goto errhandler;
- streamNo++;
-
- while (bzerr == BZ_OK) {
- nread = BZ2_bzRead ( &bzerr, bzf, obuf, 5000 );
- if (bzerr == BZ_DATA_ERROR_MAGIC) goto errhandler;
- if ((bzerr == BZ_OK || bzerr == BZ_STREAM_END) && nread > 0)
- fwrite ( obuf, sizeof(UChar), nread, stream );
- if (ferror(stream)) goto errhandler_io;
- }
- if (bzerr != BZ_STREAM_END) goto errhandler;
-
- BZ2_bzReadGetUnused ( &bzerr, bzf, (void**)(&unusedTmp), &nUnused );
- if (bzerr != BZ_OK) panic ( "decompress:bzReadGetUnused" );
-
- for (i = 0; i < nUnused; i++) unused[i] = unusedTmp[i];
-
- BZ2_bzReadClose ( &bzerr, bzf );
- if (bzerr != BZ_OK) panic ( "decompress:bzReadGetUnused" );
-
- if (nUnused == 0 && myfeof(zStream)) break;
-
- }
-
- if (ferror(zStream)) goto errhandler_io;
- ret = fclose ( zStream );
- if (ret == EOF) goto errhandler_io;
-
- if (ferror(stream)) goto errhandler_io;
- ret = fflush ( stream );
- if (ret != 0) goto errhandler_io;
- if (stream != stdout) {
- ret = fclose ( stream );
- if (ret == EOF) goto errhandler_io;
- }
- if (verbosity >= 2) fprintf ( stderr, "\n " );
- return True;
-
- errhandler:
- BZ2_bzReadClose ( &bzerr_dummy, bzf );
- switch (bzerr) {
- case BZ_CONFIG_ERROR:
- configError(); break;
- case BZ_IO_ERROR:
- errhandler_io:
- ioError(); break;
- case BZ_DATA_ERROR:
- crcError();
- case BZ_MEM_ERROR:
- outOfMemory();
- case BZ_UNEXPECTED_EOF:
- compressedStreamEOF();
- case BZ_DATA_ERROR_MAGIC:
- if (zStream != stdin) fclose(zStream);
- if (stream != stdout) fclose(stream);
- if (streamNo == 1) {
- return False;
- } else {
- if (noisy)
- fprintf ( stderr,
- "\n%s: %s: trailing garbage after EOF ignored\n",
- progName, inName );
- return True;
- }
- default:
- panic ( "decompress:unexpected error" );
- }
-
- panic ( "decompress:end" );
- return True; /*notreached*/
-}
-
-
-/*---------------------------------------------*/
-static
-Bool testStream ( FILE *zStream )
-{
- BZFILE* bzf = NULL;
- Int32 bzerr, bzerr_dummy, ret, nread, streamNo, i;
- UChar obuf[5000];
- UChar unused[BZ_MAX_UNUSED];
- Int32 nUnused;
- UChar* unusedTmp;
-
- nUnused = 0;
- streamNo = 0;
-
- SET_BINARY_MODE(zStream);
- if (ferror(zStream)) goto errhandler_io;
-
- while (True) {
-
- bzf = BZ2_bzReadOpen (
- &bzerr, zStream, verbosity,
- (int)smallMode, unused, nUnused
- );
- if (bzf == NULL || bzerr != BZ_OK) goto errhandler;
- streamNo++;
-
- while (bzerr == BZ_OK) {
- nread = BZ2_bzRead ( &bzerr, bzf, obuf, 5000 );
- if (bzerr == BZ_DATA_ERROR_MAGIC) goto errhandler;
- }
- if (bzerr != BZ_STREAM_END) goto errhandler;
-
- BZ2_bzReadGetUnused ( &bzerr, bzf, (void**)(&unusedTmp), &nUnused );
- if (bzerr != BZ_OK) panic ( "test:bzReadGetUnused" );
-
- for (i = 0; i < nUnused; i++) unused[i] = unusedTmp[i];
-
- BZ2_bzReadClose ( &bzerr, bzf );
- if (bzerr != BZ_OK) panic ( "test:bzReadGetUnused" );
- if (nUnused == 0 && myfeof(zStream)) break;
-
- }
-
- if (ferror(zStream)) goto errhandler_io;
- ret = fclose ( zStream );
- if (ret == EOF) goto errhandler_io;
-
- if (verbosity >= 2) fprintf ( stderr, "\n " );
- return True;
-
- errhandler:
- BZ2_bzReadClose ( &bzerr_dummy, bzf );
- if (verbosity == 0)
- fprintf ( stderr, "%s: %s: ", progName, inName );
- switch (bzerr) {
- case BZ_CONFIG_ERROR:
- configError(); break;
- case BZ_IO_ERROR:
- errhandler_io:
- ioError(); break;
- case BZ_DATA_ERROR:
- fprintf ( stderr,
- "data integrity (CRC) error in data\n" );
- return False;
- case BZ_MEM_ERROR:
- outOfMemory();
- case BZ_UNEXPECTED_EOF:
- fprintf ( stderr,
- "file ends unexpectedly\n" );
- return False;
- case BZ_DATA_ERROR_MAGIC:
- if (zStream != stdin) fclose(zStream);
- if (streamNo == 1) {
- fprintf ( stderr,
- "bad magic number (file not created by bzip2)\n" );
- return False;
- } else {
- if (noisy)
- fprintf ( stderr,
- "trailing garbage after EOF ignored\n" );
- return True;
- }
- default:
- panic ( "test:unexpected error" );
- }
-
- panic ( "test:end" );
- return True; /*notreached*/
-}
-
-
-/*---------------------------------------------------*/
-/*--- Error [non-] handling grunge ---*/
-/*---------------------------------------------------*/
-
-/*---------------------------------------------*/
-static
-void setExit ( Int32 v )
-{
- if (v > exitValue) exitValue = v;
-}
-
-
-/*---------------------------------------------*/
-static
-void cadvise ( void )
-{
- if (noisy)
- fprintf (
- stderr,
- "\nIt is possible that the compressed file(s) have become corrupted.\n"
- "You can use the -tvv option to test integrity of such files.\n\n"
- "You can use the `bzip2recover' program to *attempt* to recover\n"
- "data from undamaged sections of corrupted files.\n\n"
- );
-}
-
-
-/*---------------------------------------------*/
-static
-void showFileNames ( void )
-{
- if (noisy)
- fprintf (
- stderr,
- "\tInput file = %s, output file = %s\n",
- inName, outName
- );
-}
-
-
-/*---------------------------------------------*/
-static
-void cleanUpAndFail ( Int32 ec )
-{
- IntNative retVal;
-
- if ( srcMode == SM_F2F
- && opMode != OM_TEST
- && deleteOutputOnInterrupt ) {
- if (noisy)
- fprintf ( stderr, "%s: Deleting output file %s, if it exists.\n",
- progName, outName );
- if (outputHandleJustInCase != NULL)
- fclose ( outputHandleJustInCase );
- retVal = remove ( outName );
- if (retVal != 0)
- fprintf ( stderr,
- "%s: WARNING: deletion of output file (apparently) failed.\n",
- progName );
- }
- if (noisy && numFileNames > 0 && numFilesProcessed < numFileNames) {
- fprintf ( stderr,
- "%s: WARNING: some files have not been processed:\n"
- "\t%d specified on command line, %d not processed yet.\n\n",
- progName, numFileNames,
- numFileNames - numFilesProcessed );
- }
- setExit(ec);
- exit(exitValue);
-}
-
-
-/*---------------------------------------------*/
-static
-void panic ( Char* s )
-{
- fprintf ( stderr,
- "\n%s: PANIC -- internal consistency error:\n"
- "\t%s\n"
- "\tThis is a BUG. Please report it to me at:\n"
- "\tjseward@acm.org\n",
- progName, s );
- showFileNames();
- cleanUpAndFail( 3 );
-}
-
-
-/*---------------------------------------------*/
-static
-void crcError ( void )
-{
- fprintf ( stderr,
- "\n%s: Data integrity error when decompressing.\n",
- progName );
- showFileNames();
- cadvise();
- cleanUpAndFail( 2 );
-}
-
-
-/*---------------------------------------------*/
-static
-void compressedStreamEOF ( void )
-{
- fprintf ( stderr,
- "\n%s: Compressed file ends unexpectedly;\n\t"
- "perhaps it is corrupted? *Possible* reason follows.\n",
- progName );
- perror ( progName );
- showFileNames();
- cadvise();
- cleanUpAndFail( 2 );
-}
-
-
-/*---------------------------------------------*/
-static
-void ioError ( void )
-{
- fprintf ( stderr,
- "\n%s: I/O or other error, bailing out. "
- "Possible reason follows.\n",
- progName );
- perror ( progName );
- showFileNames();
- cleanUpAndFail( 1 );
-}
-
-
-/*---------------------------------------------*/
-static
-void mySignalCatcher ( IntNative n )
-{
- fprintf ( stderr,
- "\n%s: Control-C or similar caught, quitting.\n",
- progName );
- cleanUpAndFail(1);
-}
-
-
-/*---------------------------------------------*/
-static
-void mySIGSEGVorSIGBUScatcher ( IntNative n )
-{
- if (opMode == OM_Z)
- fprintf (
- stderr,
- "\n%s: Caught a SIGSEGV or SIGBUS whilst compressing.\n"
- "\n"
- " Possible causes are (most likely first):\n"
- " (1) This computer has unreliable memory or cache hardware\n"
- " (a surprisingly common problem; try a different machine.)\n"
- " (2) A bug in the compiler used to create this executable\n"
- " (unlikely, if you didn't compile bzip2 yourself.)\n"
- " (3) A real bug in bzip2 -- I hope this should never be the case.\n"
- " The user's manual, Section 4.3, has more info on (1) and (2).\n"
- " \n"
- " If you suspect this is a bug in bzip2, or are unsure about (1)\n"
- " or (2), feel free to report it to me at: jseward@acm.org.\n"
- " Section 4.3 of the user's manual describes the info a useful\n"
- " bug report should have. If the manual is available on your\n"
- " system, please try and read it before mailing me. If you don't\n"
- " have the manual or can't be bothered to read it, mail me anyway.\n"
- "\n",
- progName );
- else
- fprintf (
- stderr,
- "\n%s: Caught a SIGSEGV or SIGBUS whilst decompressing.\n"
- "\n"
- " Possible causes are (most likely first):\n"
- " (1) The compressed data is corrupted, and bzip2's usual checks\n"
- " failed to detect this. Try bzip2 -tvv my_file.bz2.\n"
- " (2) This computer has unreliable memory or cache hardware\n"
- " (a surprisingly common problem; try a different machine.)\n"
- " (3) A bug in the compiler used to create this executable\n"
- " (unlikely, if you didn't compile bzip2 yourself.)\n"
- " (4) A real bug in bzip2 -- I hope this should never be the case.\n"
- " The user's manual, Section 4.3, has more info on (2) and (3).\n"
- " \n"
- " If you suspect this is a bug in bzip2, or are unsure about (2)\n"
- " or (3), feel free to report it to me at: jseward@acm.org.\n"
- " Section 4.3 of the user's manual describes the info a useful\n"
- " bug report should have. If the manual is available on your\n"
- " system, please try and read it before mailing me. If you don't\n"
- " have the manual or can't be bothered to read it, mail me anyway.\n"
- "\n",
- progName );
-
- showFileNames();
- if (opMode == OM_Z)
- cleanUpAndFail( 3 ); else
- { cadvise(); cleanUpAndFail( 2 ); }
-}
-
-
-/*---------------------------------------------*/
-static
-void outOfMemory ( void )
-{
- fprintf ( stderr,
- "\n%s: couldn't allocate enough memory\n",
- progName );
- showFileNames();
- cleanUpAndFail(1);
-}
-
-
-/*---------------------------------------------*/
-static
-void configError ( void )
-{
- fprintf ( stderr,
- "bzip2: I'm not configured correctly for this platform!\n"
- "\tI require Int32, Int16 and Char to have sizes\n"
- "\tof 4, 2 and 1 bytes to run properly, and they don't.\n"
- "\tProbably you can fix this by defining them correctly,\n"
- "\tand recompiling. Bye!\n" );
- setExit(3);
- exit(exitValue);
-}
-
-
-/*---------------------------------------------------*/
-/*--- The main driver machinery ---*/
-/*---------------------------------------------------*/
-
-/*---------------------------------------------*/
-static
-void pad ( Char *s )
-{
- Int32 i;
- if ( (Int32)strlen(s) >= longestFileName ) return;
- for (i = 1; i <= longestFileName - (Int32)strlen(s); i++)
- fprintf ( stderr, " " );
-}
-
-
-/*---------------------------------------------*/
-static
-void copyFileName ( Char* to, Char* from )
-{
- if ( strlen(from) > FILE_NAME_LEN-10 ) {
- fprintf (
- stderr,
- "bzip2: file name\n`%s'\n"
- "is suspiciously (more than %d chars) long.\n"
- "Try using a reasonable file name instead. Sorry! :-)\n",
- from, FILE_NAME_LEN-10
- );
- setExit(1);
- exit(exitValue);
- }
-
- strncpy(to,from,FILE_NAME_LEN-10);
- to[FILE_NAME_LEN-10]='\0';
-}
-
-
-/*---------------------------------------------*/
-static
-Bool fileExists ( Char* name )
-{
- FILE *tmp = fopen ( name, "rb" );
- Bool exists = (tmp != NULL);
- if (tmp != NULL) fclose ( tmp );
- return exists;
-}
-
-
-/*---------------------------------------------*/
-/*--
- if in doubt, return True
---*/
-static
-Bool notAStandardFile ( Char* name )
-{
- IntNative i;
- struct MY_STAT statBuf;
-
- i = MY_LSTAT ( name, &statBuf );
- if (i != 0) return True;
- if (MY_S_IFREG(statBuf.st_mode)) return False;
- return True;
-}
-
-
-/*---------------------------------------------*/
-/*--
- rac 11/21/98 see if file has hard links to it
---*/
-static
-Int32 countHardLinks ( Char* name )
-{
- IntNative i;
- struct MY_STAT statBuf;
-
- i = MY_LSTAT ( name, &statBuf );
- if (i != 0) return 0;
- return (statBuf.st_nlink - 1);
-}
-
-
-/*---------------------------------------------*/
-static
-void copyDatePermissionsAndOwner ( Char *srcName, Char *dstName )
-{
-#if BZ_UNIX
- IntNative retVal;
- struct MY_STAT statBuf;
- struct utimbuf uTimBuf;
-
- retVal = MY_LSTAT ( srcName, &statBuf );
- ERROR_IF_NOT_ZERO ( retVal );
- uTimBuf.actime = statBuf.st_atime;
- uTimBuf.modtime = statBuf.st_mtime;
-
- retVal = chmod ( dstName, statBuf.st_mode );
- ERROR_IF_NOT_ZERO ( retVal );
-
- retVal = utime ( dstName, &uTimBuf );
- ERROR_IF_NOT_ZERO ( retVal );
-
- retVal = chown ( dstName, statBuf.st_uid, statBuf.st_gid );
- /* chown() will in many cases return with EPERM, which can
- be safely ignored.
- */
-#endif
-}
-
-
-/*---------------------------------------------*/
-static
-void setInterimPermissions ( Char *dstName )
-{
-#if BZ_UNIX
- IntNative retVal;
- retVal = chmod ( dstName, S_IRUSR | S_IWUSR );
- ERROR_IF_NOT_ZERO ( retVal );
-#endif
-}
-
-
-/*---------------------------------------------*/
-static
-Bool containsDubiousChars ( Char* name )
-{
- Bool cdc = False;
- for (; *name != '\0'; name++)
- if (*name == '?' || *name == '*') cdc = True;
- return cdc;
-}
-
-
-/*---------------------------------------------*/
-#define BZ_N_SUFFIX_PAIRS 4
-
-Char* zSuffix[BZ_N_SUFFIX_PAIRS]
- = { ".bz2", ".bz", ".tbz2", ".tbz" };
-Char* unzSuffix[BZ_N_SUFFIX_PAIRS]
- = { "", "", ".tar", ".tar" };
-
-static
-Bool hasSuffix ( Char* s, Char* suffix )
-{
- Int32 ns = strlen(s);
- Int32 nx = strlen(suffix);
- if (ns < nx) return False;
- if (strcmp(s + ns - nx, suffix) == 0) return True;
- return False;
-}
-
-static
-Bool mapSuffix ( Char* name,
- Char* oldSuffix, Char* newSuffix )
-{
- if (!hasSuffix(name,oldSuffix)) return False;
- name[strlen(name)-strlen(oldSuffix)] = 0;
- strcat ( name, newSuffix );
- return True;
-}
-
-
-/*---------------------------------------------*/
-static
-void compress ( Char *name )
-{
- FILE *inStr;
- FILE *outStr;
- Int32 n, i;
-
- deleteOutputOnInterrupt = False;
-
- if (name == NULL && srcMode != SM_I2O)
- panic ( "compress: bad modes\n" );
-
- switch (srcMode) {
- case SM_I2O:
- copyFileName ( inName, "(stdin)" );
- copyFileName ( outName, "(stdout)" );
- break;
- case SM_F2F:
- copyFileName ( inName, name );
- copyFileName ( outName, name );
- strcat ( outName, ".bz2" );
- break;
- case SM_F2O:
- copyFileName ( inName, name );
- copyFileName ( outName, "(stdout)" );
- break;
- }
-
- if ( srcMode != SM_I2O && containsDubiousChars ( inName ) ) {
- if (noisy)
- fprintf ( stderr, "%s: There are no files matching `%s'.\n",
- progName, inName );
- setExit(1);
- return;
- }
- if ( srcMode != SM_I2O && !fileExists ( inName ) ) {
- fprintf ( stderr, "%s: Can't open input file %s: %s.\n",
- progName, inName, strerror(errno) );
- setExit(1);
- return;
- }
- for (i = 0; i < BZ_N_SUFFIX_PAIRS; i++) {
- if (hasSuffix(inName, zSuffix[i])) {
- if (noisy)
- fprintf ( stderr,
- "%s: Input file %s already has %s suffix.\n",
- progName, inName, zSuffix[i] );
- setExit(1);
- return;
- }
- }
- if ( srcMode == SM_F2F && !forceOverwrite && notAStandardFile ( inName )) {
- if (noisy)
- fprintf ( stderr, "%s: Input file %s is not a normal file.\n",
- progName, inName );
- setExit(1);
- return;
- }
- if ( srcMode == SM_F2F && !forceOverwrite && fileExists ( outName ) ) {
- fprintf ( stderr, "%s: Output file %s already exists.\n",
- progName, outName );
- setExit(1);
- return;
- }
- if ( srcMode == SM_F2F && !forceOverwrite &&
- (n=countHardLinks ( inName )) > 0) {
- fprintf ( stderr, "%s: Input file %s has %d other link%s.\n",
- progName, inName, n, n > 1 ? "s" : "" );
- setExit(1);
- return;
- }
-
- switch ( srcMode ) {
-
- case SM_I2O:
- inStr = stdin;
- outStr = stdout;
- if ( isatty ( fileno ( stdout ) ) ) {
- fprintf ( stderr,
- "%s: I won't write compressed data to a terminal.\n",
- progName );
- fprintf ( stderr, "%s: For help, type: `%s --help'.\n",
- progName, progName );
- setExit(1);
- return;
- };
- break;
-
- case SM_F2O:
- inStr = fopen ( inName, "rb" );
- outStr = stdout;
- if ( isatty ( fileno ( stdout ) ) ) {
- fprintf ( stderr,
- "%s: I won't write compressed data to a terminal.\n",
- progName );
- fprintf ( stderr, "%s: For help, type: `%s --help'.\n",
- progName, progName );
- if ( inStr != NULL ) fclose ( inStr );
- setExit(1);
- return;
- };
- if ( inStr == NULL ) {
- fprintf ( stderr, "%s: Can't open input file %s: %s.\n",
- progName, inName, strerror(errno) );
- setExit(1);
- return;
- };
- break;
-
- case SM_F2F:
- inStr = fopen ( inName, "rb" );
- outStr = fopen ( outName, "wb" );
- if ( outStr == NULL) {
- fprintf ( stderr, "%s: Can't create output file %s: %s.\n",
- progName, outName, strerror(errno) );
- if ( inStr != NULL ) fclose ( inStr );
- setExit(1);
- return;
- }
- if ( inStr == NULL ) {
- fprintf ( stderr, "%s: Can't open input file %s: %s.\n",
- progName, inName, strerror(errno) );
- if ( outStr != NULL ) fclose ( outStr );
- setExit(1);
- return;
- };
- setInterimPermissions ( outName );
- break;
-
- default:
- panic ( "compress: bad srcMode" );
- break;
- }
-
- if (verbosity >= 1) {
- fprintf ( stderr, " %s: ", inName );
- pad ( inName );
- fflush ( stderr );
- }
-
- /*--- Now the input and output handles are sane. Do the Biz. ---*/
- outputHandleJustInCase = outStr;
- deleteOutputOnInterrupt = True;
- compressStream ( inStr, outStr );
- outputHandleJustInCase = NULL;
-
- /*--- If there was an I/O error, we won't get here. ---*/
- if ( srcMode == SM_F2F ) {
- copyDatePermissionsAndOwner ( inName, outName );
- deleteOutputOnInterrupt = False;
- if ( !keepInputFiles ) {
- IntNative retVal = remove ( inName );
- ERROR_IF_NOT_ZERO ( retVal );
- }
- }
-
- deleteOutputOnInterrupt = False;
-}
-
-
-/*---------------------------------------------*/
-static
-void uncompress ( Char *name )
-{
- FILE *inStr;
- FILE *outStr;
- Int32 n, i;
- Bool magicNumberOK;
- Bool cantGuess;
-
- deleteOutputOnInterrupt = False;
-
- if (name == NULL && srcMode != SM_I2O)
- panic ( "uncompress: bad modes\n" );
-
- cantGuess = False;
- switch (srcMode) {
- case SM_I2O:
- copyFileName ( inName, "(stdin)" );
- copyFileName ( outName, "(stdout)" );
- break;
- case SM_F2F:
- copyFileName ( inName, name );
- copyFileName ( outName, name );
- for (i = 0; i < BZ_N_SUFFIX_PAIRS; i++)
- if (mapSuffix(outName,zSuffix[i],unzSuffix[i]))
- goto zzz;
- cantGuess = True;
- strcat ( outName, ".out" );
- break;
- case SM_F2O:
- copyFileName ( inName, name );
- copyFileName ( outName, "(stdout)" );
- break;
- }
-
- zzz:
- if ( srcMode != SM_I2O && containsDubiousChars ( inName ) ) {
- if (noisy)
- fprintf ( stderr, "%s: There are no files matching `%s'.\n",
- progName, inName );
- setExit(1);
- return;
- }
- if ( srcMode != SM_I2O && !fileExists ( inName ) ) {
- fprintf ( stderr, "%s: Can't open input file %s: %s.\n",
- progName, inName, strerror(errno) );
- setExit(1);
- return;
- }
- if ( srcMode == SM_F2F && !forceOverwrite && notAStandardFile ( inName )) {
- if (noisy)
- fprintf ( stderr, "%s: Input file %s is not a normal file.\n",
- progName, inName );
- setExit(1);
- return;
- }
- if ( /* srcMode == SM_F2F implied && */ cantGuess ) {
- if (noisy)
- fprintf ( stderr,
- "%s: Can't guess original name for %s -- using %s\n",
- progName, inName, outName );
- /* just a warning, no return */
- }
- if ( srcMode == SM_F2F && !forceOverwrite && fileExists ( outName ) ) {
- fprintf ( stderr, "%s: Output file %s already exists.\n",
- progName, outName );
- setExit(1);
- return;
- }
- if ( srcMode == SM_F2F && !forceOverwrite &&
- (n=countHardLinks ( inName ) ) > 0) {
- fprintf ( stderr, "%s: Input file %s has %d other link%s.\n",
- progName, inName, n, n > 1 ? "s" : "" );
- setExit(1);
- return;
- }
-
- switch ( srcMode ) {
-
- case SM_I2O:
- inStr = stdin;
- outStr = stdout;
- if ( isatty ( fileno ( stdin ) ) ) {
- fprintf ( stderr,
- "%s: I won't read compressed data from a terminal.\n",
- progName );
- fprintf ( stderr, "%s: For help, type: `%s --help'.\n",
- progName, progName );
- setExit(1);
- return;
- };
- break;
-
- case SM_F2O:
- inStr = fopen ( inName, "rb" );
- outStr = stdout;
- if ( inStr == NULL ) {
- fprintf ( stderr, "%s: Can't open input file %s:%s.\n",
- progName, inName, strerror(errno) );
- if ( inStr != NULL ) fclose ( inStr );
- setExit(1);
- return;
- };
- break;
-
- case SM_F2F:
- inStr = fopen ( inName, "rb" );
- outStr = fopen ( outName, "wb" );
- if ( outStr == NULL) {
- fprintf ( stderr, "%s: Can't create output file %s: %s.\n",
- progName, outName, strerror(errno) );
- if ( inStr != NULL ) fclose ( inStr );
- setExit(1);
- return;
- }
- if ( inStr == NULL ) {
- fprintf ( stderr, "%s: Can't open input file %s: %s.\n",
- progName, inName, strerror(errno) );
- if ( outStr != NULL ) fclose ( outStr );
- setExit(1);
- return;
- };
- setInterimPermissions ( outName );
- break;
-
- default:
- panic ( "uncompress: bad srcMode" );
- break;
- }
-
- if (verbosity >= 1) {
- fprintf ( stderr, " %s: ", inName );
- pad ( inName );
- fflush ( stderr );
- }
-
- /*--- Now the input and output handles are sane. Do the Biz. ---*/
- outputHandleJustInCase = outStr;
- deleteOutputOnInterrupt = True;
- magicNumberOK = uncompressStream ( inStr, outStr );
- outputHandleJustInCase = NULL;
-
- /*--- If there was an I/O error, we won't get here. ---*/
- if ( magicNumberOK ) {
- if ( srcMode == SM_F2F ) {
- copyDatePermissionsAndOwner ( inName, outName );
- deleteOutputOnInterrupt = False;
- if ( !keepInputFiles ) {
- IntNative retVal = remove ( inName );
- ERROR_IF_NOT_ZERO ( retVal );
- }
- }
- } else {
- unzFailsExist = True;
- deleteOutputOnInterrupt = False;
- if ( srcMode == SM_F2F ) {
- IntNative retVal = remove ( outName );
- ERROR_IF_NOT_ZERO ( retVal );
- }
- }
- deleteOutputOnInterrupt = False;
-
- if ( magicNumberOK ) {
- if (verbosity >= 1)
- fprintf ( stderr, "done\n" );
- } else {
- setExit(2);
- if (verbosity >= 1)
- fprintf ( stderr, "not a bzip2 file.\n" ); else
- fprintf ( stderr,
- "%s: %s is not a bzip2 file.\n",
- progName, inName );
- }
-
-}
-
-
-/*---------------------------------------------*/
-static
-void testf ( Char *name )
-{
- FILE *inStr;
- Bool allOK;
-
- deleteOutputOnInterrupt = False;
-
- if (name == NULL && srcMode != SM_I2O)
- panic ( "testf: bad modes\n" );
-
- copyFileName ( outName, "(none)" );
- switch (srcMode) {
- case SM_I2O: copyFileName ( inName, "(stdin)" ); break;
- case SM_F2F: copyFileName ( inName, name ); break;
- case SM_F2O: copyFileName ( inName, name ); break;
- }
-
- if ( srcMode != SM_I2O && containsDubiousChars ( inName ) ) {
- if (noisy)
- fprintf ( stderr, "%s: There are no files matching `%s'.\n",
- progName, inName );
- setExit(1);
- return;
- }
- if ( srcMode != SM_I2O && !fileExists ( inName ) ) {
- fprintf ( stderr, "%s: Can't open input %s: %s.\n",
- progName, inName, strerror(errno) );
- setExit(1);
- return;
- }
-
- switch ( srcMode ) {
-
- case SM_I2O:
- if ( isatty ( fileno ( stdin ) ) ) {
- fprintf ( stderr,
- "%s: I won't read compressed data from a terminal.\n",
- progName );
- fprintf ( stderr, "%s: For help, type: `%s --help'.\n",
- progName, progName );
- setExit(1);
- return;
- };
- inStr = stdin;
- break;
-
- case SM_F2O: case SM_F2F:
- inStr = fopen ( inName, "rb" );
- if ( inStr == NULL ) {
- fprintf ( stderr, "%s: Can't open input file %s:%s.\n",
- progName, inName, strerror(errno) );
- setExit(1);
- return;
- };
- break;
-
- default:
- panic ( "testf: bad srcMode" );
- break;
- }
-
- if (verbosity >= 1) {
- fprintf ( stderr, " %s: ", inName );
- pad ( inName );
- fflush ( stderr );
- }
-
- /*--- Now the input handle is sane. Do the Biz. ---*/
- allOK = testStream ( inStr );
-
- if (allOK && verbosity >= 1) fprintf ( stderr, "ok\n" );
- if (!allOK) testFailsExist = True;
-}
-
-
-/*---------------------------------------------*/
-static
-void license ( void )
-{
- fprintf ( stderr,
-
- "bzip2, a block-sorting file compressor. "
- "Version %s.\n"
- " \n"
- " Copyright (C) 1996-2000 by Julian Seward.\n"
- " \n"
- " This program is free software; you can redistribute it and/or modify\n"
- " it under the terms set out in the LICENSE file, which is included\n"
- " in the bzip2-1.0 source distribution.\n"
- " \n"
- " This program is distributed in the hope that it will be useful,\n"
- " but WITHOUT ANY WARRANTY; without even the implied warranty of\n"
- " MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n"
- " LICENSE file for more details.\n"
- " \n",
- BZ2_bzlibVersion()
- );
-}
-
-
-/*---------------------------------------------*/
-static
-void usage ( Char *fullProgName )
-{
- fprintf (
- stderr,
- "bzip2, a block-sorting file compressor. "
- "Version %s.\n"
- "\n usage: %s [flags and input files in any order]\n"
- "\n"
- " -h --help print this message\n"
- " -d --decompress force decompression\n"
- " -z --compress force compression\n"
- " -k --keep keep (don't delete) input files\n"
- " -f --force overwrite existing output files\n"
- " -t --test test compressed file integrity\n"
- " -c --stdout output to standard out\n"
- " -q --quiet suppress noncritical error messages\n"
- " -v --verbose be verbose (a 2nd -v gives more)\n"
- " -L --license display software version & license\n"
- " -V --version display software version & license\n"
- " -s --small use less memory (at most 2500k)\n"
- " -1 .. -9 set block size to 100k .. 900k\n"
- "\n"
- " If invoked as `bzip2', default action is to compress.\n"
- " as `bunzip2', default action is to decompress.\n"
- " as `bzcat', default action is to decompress to stdout.\n"
- "\n"
- " If no file names are given, bzip2 compresses or decompresses\n"
- " from standard input to standard output. You can combine\n"
- " short flags, so `-v -4' means the same as -v4 or -4v, &c.\n"
-#if BZ_UNIX
- "\n"
-#endif
- ,
-
- BZ2_bzlibVersion(),
- fullProgName
- );
-}
-
-
-/*---------------------------------------------*/
-static
-void redundant ( Char* flag )
-{
- fprintf (
- stderr,
- "%s: %s is redundant in versions 0.9.5 and above\n",
- progName, flag );
-}
-
-
-/*---------------------------------------------*/
-/*--
- All the garbage from here to main() is purely to
- implement a linked list of command-line arguments,
- into which main() copies argv[1 .. argc-1].
-
- The purpose of this exercise is to facilitate
- the expansion of wildcard characters * and ? in
- filenames for OSs which don't know how to do it
- themselves, like MSDOS, Windows 95 and NT.
-
- The actual Dirty Work is done by the platform-
- specific macro APPEND_FILESPEC.
---*/
-
-typedef
- struct zzzz {
- Char *name;
- struct zzzz *link;
- }
- Cell;
-
-
-/*---------------------------------------------*/
-static
-void *myMalloc ( Int32 n )
-{
- void* p;
-
- p = malloc ( (size_t)n );
- if (p == NULL) outOfMemory ();
- return p;
-}
-
-
-/*---------------------------------------------*/
-static
-Cell *mkCell ( void )
-{
- Cell *c;
-
- c = (Cell*) myMalloc ( sizeof ( Cell ) );
- c->name = NULL;
- c->link = NULL;
- return c;
-}
-
-
-/*---------------------------------------------*/
-static
-Cell *snocString ( Cell *root, Char *name )
-{
- if (root == NULL) {
- Cell *tmp = mkCell();
- tmp->name = (Char*) myMalloc ( 5 + strlen(name) );
- strcpy ( tmp->name, name );
- return tmp;
- } else {
- Cell *tmp = root;
- while (tmp->link != NULL) tmp = tmp->link;
- tmp->link = snocString ( tmp->link, name );
- return root;
- }
-}
-
-
-/*---------------------------------------------*/
-static
-void addFlagsFromEnvVar ( Cell** argList, Char* varName )
-{
- Int32 i, j, k;
- Char *envbase, *p;
-
- envbase = getenv(varName);
- if (envbase != NULL) {
- p = envbase;
- i = 0;
- while (True) {
- if (p[i] == 0) break;
- p += i;
- i = 0;
- while (isspace((Int32)(p[0]))) p++;
- while (p[i] != 0 && !isspace((Int32)(p[i]))) i++;
- if (i > 0) {
- k = i; if (k > FILE_NAME_LEN-10) k = FILE_NAME_LEN-10;
- for (j = 0; j < k; j++) tmpName[j] = p[j];
- tmpName[k] = 0;
- APPEND_FLAG(*argList, tmpName);
- }
- }
- }
-}
-
-
-/*---------------------------------------------*/
-#define ISFLAG(s) (strcmp(aa->name, (s))==0)
-
-IntNative main ( IntNative argc, Char *argv[] )
-{
- Int32 i, j;
- Char *tmp;
- Cell *argList;
- Cell *aa;
- Bool decode;
-
- /*-- Be really really really paranoid :-) --*/
- if (sizeof(Int32) != 4 || sizeof(UInt32) != 4 ||
- sizeof(Int16) != 2 || sizeof(UInt16) != 2 ||
- sizeof(Char) != 1 || sizeof(UChar) != 1)
- configError();
-
- /*-- Initialise --*/
- outputHandleJustInCase = NULL;
- smallMode = False;
- keepInputFiles = False;
- forceOverwrite = False;
- noisy = True;
- verbosity = 0;
- blockSize100k = 9;
- testFailsExist = False;
- unzFailsExist = False;
- numFileNames = 0;
- numFilesProcessed = 0;
- workFactor = 30;
- deleteOutputOnInterrupt = False;
- exitValue = 0;
- i = j = 0; /* avoid bogus warning from egcs-1.1.X */
-
- /*-- Set up signal handlers for mem access errors --*/
- signal (SIGSEGV, mySIGSEGVorSIGBUScatcher);
-#if BZ_UNIX
-#ifndef __DJGPP__
- signal (SIGBUS, mySIGSEGVorSIGBUScatcher);
-#endif
-#endif
-
- copyFileName ( inName, "(none)" );
- copyFileName ( outName, "(none)" );
-
- copyFileName ( progNameReally, argv[0] );
- progName = &progNameReally[0];
- for (tmp = &progNameReally[0]; *tmp != '\0'; tmp++)
- if (*tmp == PATH_SEP) progName = tmp + 1;
-
-
- /*-- Copy flags from env var BZIP2, and
- expand filename wildcards in arg list.
- --*/
- argList = NULL;
- addFlagsFromEnvVar ( &argList, "BZIP2" );
- addFlagsFromEnvVar ( &argList, "BZIP" );
- for (i = 1; i <= argc-1; i++)
- APPEND_FILESPEC(argList, argv[i]);
-
-
- /*-- Find the length of the longest filename --*/
- longestFileName = 7;
- numFileNames = 0;
- decode = True;
- for (aa = argList; aa != NULL; aa = aa->link) {
- if (ISFLAG("--")) { decode = False; continue; }
- if (aa->name[0] == '-' && decode) continue;
- numFileNames++;
- if (longestFileName < (Int32)strlen(aa->name) )
- longestFileName = (Int32)strlen(aa->name);
- }
-
-
- /*-- Determine source modes; flag handling may change this too. --*/
- if (numFileNames == 0)
- srcMode = SM_I2O; else srcMode = SM_F2F;
-
-
- /*-- Determine what to do (compress/uncompress/test/cat). --*/
- /*-- Note that subsequent flag handling may change this. --*/
- opMode = OM_Z;
-
- if ( (strstr ( progName, "unzip" ) != 0) ||
- (strstr ( progName, "UNZIP" ) != 0) )
- opMode = OM_UNZ;
-
- if ( (strstr ( progName, "z2cat" ) != 0) ||
- (strstr ( progName, "Z2CAT" ) != 0) ||
- (strstr ( progName, "zcat" ) != 0) ||
- (strstr ( progName, "ZCAT" ) != 0) ) {
- opMode = OM_UNZ;
- srcMode = (numFileNames == 0) ? SM_I2O : SM_F2O;
- }
-
-
- /*-- Look at the flags. --*/
- for (aa = argList; aa != NULL; aa = aa->link) {
- if (ISFLAG("--")) break;
- if (aa->name[0] == '-' && aa->name[1] != '-') {
- for (j = 1; aa->name[j] != '\0'; j++) {
- switch (aa->name[j]) {
- case 'c': srcMode = SM_F2O; break;
- case 'd': opMode = OM_UNZ; break;
- case 'z': opMode = OM_Z; break;
- case 'f': forceOverwrite = True; break;
- case 't': opMode = OM_TEST; break;
- case 'k': keepInputFiles = True; break;
- case 's': smallMode = True; break;
- case 'q': noisy = False; break;
- case '1': blockSize100k = 1; break;
- case '2': blockSize100k = 2; break;
- case '3': blockSize100k = 3; break;
- case '4': blockSize100k = 4; break;
- case '5': blockSize100k = 5; break;
- case '6': blockSize100k = 6; break;
- case '7': blockSize100k = 7; break;
- case '8': blockSize100k = 8; break;
- case '9': blockSize100k = 9; break;
- case 'V':
- case 'L': license(); break;
- case 'v': verbosity++; break;
- case 'h': usage ( progName );
- exit ( 0 );
- break;
- default: fprintf ( stderr, "%s: Bad flag `%s'\n",
- progName, aa->name );
- usage ( progName );
- exit ( 1 );
- break;
- }
- }
- }
- }
-
- /*-- And again ... --*/
- for (aa = argList; aa != NULL; aa = aa->link) {
- if (ISFLAG("--")) break;
- if (ISFLAG("--stdout")) srcMode = SM_F2O; else
- if (ISFLAG("--decompress")) opMode = OM_UNZ; else
- if (ISFLAG("--compress")) opMode = OM_Z; else
- if (ISFLAG("--force")) forceOverwrite = True; else
- if (ISFLAG("--test")) opMode = OM_TEST; else
- if (ISFLAG("--keep")) keepInputFiles = True; else
- if (ISFLAG("--small")) smallMode = True; else
- if (ISFLAG("--quiet")) noisy = False; else
- if (ISFLAG("--version")) license(); else
- if (ISFLAG("--license")) license(); else
- if (ISFLAG("--exponential")) workFactor = 1; else
- if (ISFLAG("--repetitive-best")) redundant(aa->name); else
- if (ISFLAG("--repetitive-fast")) redundant(aa->name); else
- if (ISFLAG("--verbose")) verbosity++; else
- if (ISFLAG("--help")) { usage ( progName ); exit ( 0 ); }
- else
- if (strncmp ( aa->name, "--", 2) == 0) {
- fprintf ( stderr, "%s: Bad flag `%s'\n", progName, aa->name );
- usage ( progName );
- exit ( 1 );
- }
- }
-
- if (verbosity > 4) verbosity = 4;
- if (opMode == OM_Z && smallMode && blockSize100k > 2)
- blockSize100k = 2;
-
- if (opMode == OM_TEST && srcMode == SM_F2O) {
- fprintf ( stderr, "%s: -c and -t cannot be used together.\n",
- progName );
- exit ( 1 );
- }
-
- if (srcMode == SM_F2O && numFileNames == 0)
- srcMode = SM_I2O;
-
- if (opMode != OM_Z) blockSize100k = 0;
-
- if (srcMode == SM_F2F) {
- signal (SIGINT, mySignalCatcher);
- signal (SIGTERM, mySignalCatcher);
-# if BZ_UNIX
- signal (SIGHUP, mySignalCatcher);
-# endif
- }
-
- if (opMode == OM_Z) {
- if (srcMode == SM_I2O) {
- compress ( NULL );
- } else {
- decode = True;
- for (aa = argList; aa != NULL; aa = aa->link) {
- if (ISFLAG("--")) { decode = False; continue; }
- if (aa->name[0] == '-' && decode) continue;
- numFilesProcessed++;
- compress ( aa->name );
- }
- }
- }
- else
-
- if (opMode == OM_UNZ) {
- unzFailsExist = False;
- if (srcMode == SM_I2O) {
- uncompress ( NULL );
- } else {
- decode = True;
- for (aa = argList; aa != NULL; aa = aa->link) {
- if (ISFLAG("--")) { decode = False; continue; }
- if (aa->name[0] == '-' && decode) continue;
- numFilesProcessed++;
- uncompress ( aa->name );
- }
- }
- if (unzFailsExist) {
- setExit(2);
- exit(exitValue);
- }
- }
-
- else {
- testFailsExist = False;
- if (srcMode == SM_I2O) {
- testf ( NULL );
- } else {
- decode = True;
- for (aa = argList; aa != NULL; aa = aa->link) {
- if (ISFLAG("--")) { decode = False; continue; }
- if (aa->name[0] == '-' && decode) continue;
- numFilesProcessed++;
- testf ( aa->name );
- }
- }
- if (testFailsExist && noisy) {
- fprintf ( stderr,
- "\n"
- "You can use the `bzip2recover' program to attempt to recover\n"
- "data from undamaged sections of corrupted files.\n\n"
- );
- setExit(2);
- exit(exitValue);
- }
- }
-
- /* Free the argument list memory to mollify leak detectors
- (eg) Purify, Checker. Serves no other useful purpose.
- */
- aa = argList;
- while (aa != NULL) {
- Cell* aa2 = aa->link;
- if (aa->name != NULL) free(aa->name);
- free(aa);
- aa = aa2;
- }
-
- return exitValue;
-}
-
-
-/*-----------------------------------------------------------*/
-/*--- end bzip2.c ---*/
-/*-----------------------------------------------------------*/
+++ /dev/null
-
-
-NAME
- bzip2, bunzip2 - a block-sorting file compressor, v1.0
- bzcat - decompresses files to stdout
- bzip2recover - recovers data from damaged bzip2 files
-
-
-SYNOPSIS
- bzip2 [ -cdfkqstvzVL123456789 ] [ filenames ... ]
- bunzip2 [ -fkvsVL ] [ filenames ... ]
- bzcat [ -s ] [ filenames ... ]
- bzip2recover filename
-
-
-DESCRIPTION
- bzip2 compresses files using the Burrows-Wheeler block
- sorting text compression algorithm, and Huffman coding.
- Compression is generally considerably better than that
- achieved by more conventional LZ77/LZ78-based compressors,
- and approaches the performance of the PPM family of sta-
- tistical compressors.
-
- The command-line options are deliberately very similar to
- those of GNU gzip, but they are not identical.
-
- bzip2 expects a list of file names to accompany the com-
- mand-line flags. Each file is replaced by a compressed
- version of itself, with the name "original_name.bz2".
- Each compressed file has the same modification date, per-
- missions, and, when possible, ownership as the correspond-
- ing original, so that these properties can be correctly
- restored at decompression time. File name handling is
- naive in the sense that there is no mechanism for preserv-
- ing original file names, permissions, ownerships or dates
- in filesystems which lack these concepts, or have serious
- file name length restrictions, such as MS-DOS.
-
- bzip2 and bunzip2 will by default not overwrite existing
- files. If you want this to happen, specify the -f flag.
-
- If no file names are specified, bzip2 compresses from
- standard input to standard output. In this case, bzip2
- will decline to write compressed output to a terminal, as
- this would be entirely incomprehensible and therefore
- pointless.
-
- bunzip2 (or bzip2 -d) decompresses all specified files.
- Files which were not created by bzip2 will be detected and
- ignored, and a warning issued. bzip2 attempts to guess
- the filename for the decompressed file from that of the
- compressed file as follows:
-
- filename.bz2 becomes filename
- filename.bz becomes filename
- filename.tbz2 becomes filename.tar
- filename.tbz becomes filename.tar
- anyothername becomes anyothername.out
-
- If the file does not end in one of the recognised endings,
- .bz2, .bz, .tbz2 or .tbz, bzip2 complains that it cannot
- guess the name of the original file, and uses the original
- name with .out appended.
-
- As with compression, supplying no filenames causes decom-
- pression from standard input to standard output.
-
- bunzip2 will correctly decompress a file which is the con-
- catenation of two or more compressed files. The result is
- the concatenation of the corresponding uncompressed files.
- Integrity testing (-t) of concatenated compressed files is
- also supported.
-
- You can also compress or decompress files to the standard
- output by giving the -c flag. Multiple files may be com-
- pressed and decompressed like this. The resulting outputs
- are fed sequentially to stdout. Compression of multiple
- files in this manner generates a stream containing multi-
- ple compressed file representations. Such a stream can be
- decompressed correctly only by bzip2 version 0.9.0 or
- later. Earlier versions of bzip2 will stop after decom-
- pressing the first file in the stream.
-
- bzcat (or bzip2 -dc) decompresses all specified files to
- the standard output.
-
- bzip2 will read arguments from the environment variables
- BZIP2 and BZIP, in that order, and will process them
- before any arguments read from the command line. This
- gives a convenient way to supply default arguments.
-
- Compression is always performed, even if the compressed
- file is slightly larger than the original. Files of less
- than about one hundred bytes tend to get larger, since the
- compression mechanism has a constant overhead in the
- region of 50 bytes. Random data (including the output of
- most file compressors) is coded at about 8.05 bits per
- byte, giving an expansion of around 0.5%.
-
- As a self-check for your protection, bzip2 uses 32-bit
- CRCs to make sure that the decompressed version of a file
- is identical to the original. This guards against corrup-
- tion of the compressed data, and against undetected bugs
- in bzip2 (hopefully very unlikely). The chances of data
- corruption going undetected is microscopic, about one
- chance in four billion for each file processed. Be aware,
- though, that the check occurs upon decompression, so it
- can only tell you that something is wrong. It can't help
- you recover the original uncompressed data. You can use
- bzip2recover to try to recover data from damaged files.
-
- Return values: 0 for a normal exit, 1 for environmental
- problems (file not found, invalid flags, I/O errors, &c),
- 2 to indicate a corrupt compressed file, 3 for an internal
- consistency error (eg, bug) which caused bzip2 to panic.
-
-
-OPTIONS
- -c --stdout
- Compress or decompress to standard output.
-
- -d --decompress
- Force decompression. bzip2, bunzip2 and bzcat are
- really the same program, and the decision about
- what actions to take is done on the basis of which
- name is used. This flag overrides that mechanism,
- and forces bzip2 to decompress.
-
- -z --compress
- The complement to -d: forces compression, regard-
- less of the invokation name.
-
- -t --test
- Check integrity of the specified file(s), but don't
- decompress them. This really performs a trial
- decompression and throws away the result.
-
- -f --force
- Force overwrite of output files. Normally, bzip2
- will not overwrite existing output files. Also
- forces bzip2 to break hard links to files, which it
- otherwise wouldn't do.
-
- -k --keep
- Keep (don't delete) input files during compression
- or decompression.
-
- -s --small
- Reduce memory usage, for compression, decompression
- and testing. Files are decompressed and tested
- using a modified algorithm which only requires 2.5
- bytes per block byte. This means any file can be
- decompressed in 2300k of memory, albeit at about
- half the normal speed.
-
- During compression, -s selects a block size of
- 200k, which limits memory use to around the same
- figure, at the expense of your compression ratio.
- In short, if your machine is low on memory (8
- megabytes or less), use -s for everything. See
- MEMORY MANAGEMENT below.
-
- -q --quiet
- Suppress non-essential warning messages. Messages
- pertaining to I/O errors and other critical events
- will not be suppressed.
-
- -v --verbose
- Verbose mode -- show the compression ratio for each
- file processed. Further -v's increase the ver-
- bosity level, spewing out lots of information which
- is primarily of interest for diagnostic purposes.
-
- -L --license -V --version
- Display the software version, license terms and
- conditions.
-
- -1 to -9
- Set the block size to 100 k, 200 k .. 900 k when
- compressing. Has no effect when decompressing.
- See MEMORY MANAGEMENT below.
-
- -- Treats all subsequent arguments as file names, even
- if they start with a dash. This is so you can han-
- dle files with names beginning with a dash, for
- example: bzip2 -- -myfilename.
-
- --repetitive-fast --repetitive-best
- These flags are redundant in versions 0.9.5 and
- above. They provided some coarse control over the
- behaviour of the sorting algorithm in earlier ver-
- sions, which was sometimes useful. 0.9.5 and above
- have an improved algorithm which renders these
- flags irrelevant.
-
-
-MEMORY MANAGEMENT
- bzip2 compresses large files in blocks. The block size
- affects both the compression ratio achieved, and the
- amount of memory needed for compression and decompression.
- The flags -1 through -9 specify the block size to be
- 100,000 bytes through 900,000 bytes (the default) respec-
- tively. At decompression time, the block size used for
- compression is read from the header of the compressed
- file, and bunzip2 then allocates itself just enough memory
- to decompress the file. Since block sizes are stored in
- compressed files, it follows that the flags -1 to -9 are
- irrelevant to and so ignored during decompression.
-
- Compression and decompression requirements, in bytes, can
- be estimated as:
-
- Compression: 400k + ( 8 x block size )
-
- Decompression: 100k + ( 4 x block size ), or
- 100k + ( 2.5 x block size )
-
- Larger block sizes give rapidly diminishing marginal
- returns. Most of the compression comes from the first two
- or three hundred k of block size, a fact worth bearing in
- mind when using bzip2 on small machines. It is also
- important to appreciate that the decompression memory
- requirement is set at compression time by the choice of
- block size.
-
- For files compressed with the default 900k block size,
- bunzip2 will require about 3700 kbytes to decompress. To
- support decompression of any file on a 4 megabyte machine,
- bunzip2 has an option to decompress using approximately
- half this amount of memory, about 2300 kbytes. Decompres-
- sion speed is also halved, so you should use this option
- only where necessary. The relevant flag is -s.
-
- In general, try and use the largest block size memory con-
- straints allow, since that maximises the compression
- achieved. Compression and decompression speed are virtu-
- ally unaffected by block size.
-
- Another significant point applies to files which fit in a
- single block -- that means most files you'd encounter
- using a large block size. The amount of real memory
- touched is proportional to the size of the file, since the
- file is smaller than a block. For example, compressing a
- file 20,000 bytes long with the flag -9 will cause the
- compressor to allocate around 7600k of memory, but only
- touch 400k + 20000 * 8 = 560 kbytes of it. Similarly, the
- decompressor will allocate 3700k but only touch 100k +
- 20000 * 4 = 180 kbytes.
-
- Here is a table which summarises the maximum memory usage
- for different block sizes. Also recorded is the total
- compressed size for 14 files of the Calgary Text Compres-
- sion Corpus totalling 3,141,622 bytes. This column gives
- some feel for how compression varies with block size.
- These figures tend to understate the advantage of larger
- block sizes for larger files, since the Corpus is domi-
- nated by smaller files.
-
- Compress Decompress Decompress Corpus
- Flag usage usage -s usage Size
-
- -1 1200k 500k 350k 914704
- -2 2000k 900k 600k 877703
- -3 2800k 1300k 850k 860338
- -4 3600k 1700k 1100k 846899
- -5 4400k 2100k 1350k 845160
- -6 5200k 2500k 1600k 838626
- -7 6100k 2900k 1850k 834096
- -8 6800k 3300k 2100k 828642
- -9 7600k 3700k 2350k 828642
-
-
-RECOVERING DATA FROM DAMAGED FILES
- bzip2 compresses files in blocks, usually 900kbytes long.
- Each block is handled independently. If a media or trans-
- mission error causes a multi-block .bz2 file to become
- damaged, it may be possible to recover data from the
- undamaged blocks in the file.
-
- The compressed representation of each block is delimited
- by a 48-bit pattern, which makes it possible to find the
- block boundaries with reasonable certainty. Each block
- also carries its own 32-bit CRC, so damaged blocks can be
- distinguished from undamaged ones.
-
- bzip2recover is a simple program whose purpose is to
- search for blocks in .bz2 files, and write each block out
- into its own .bz2 file. You can then use bzip2 -t to test
- the integrity of the resulting files, and decompress those
- which are undamaged.
-
- bzip2recover takes a single argument, the name of the dam-
- aged file, and writes a number of files "rec0001file.bz2",
- "rec0002file.bz2", etc, containing the extracted blocks.
- The output filenames are designed so that the use of
- wildcards in subsequent processing -- for example, "bzip2
- -dc rec*file.bz2 > recovered_data" -- lists the files in
- the correct order.
-
- bzip2recover should be of most use dealing with large .bz2
- files, as these will contain many blocks. It is clearly
- futile to use it on damaged single-block files, since a
- damaged block cannot be recovered. If you wish to min-
- imise any potential data loss through media or transmis-
- sion errors, you might consider compressing with a smaller
- block size.
-
-
-PERFORMANCE NOTES
- The sorting phase of compression gathers together similar
- strings in the file. Because of this, files containing
- very long runs of repeated symbols, like "aabaabaabaab
- ..." (repeated several hundred times) may compress more
- slowly than normal. Versions 0.9.5 and above fare much
- better than previous versions in this respect. The ratio
- between worst-case and average-case compression time is in
- the region of 10:1. For previous versions, this figure
- was more like 100:1. You can use the -vvvv option to mon-
- itor progress in great detail, if you want.
-
- Decompression speed is unaffected by these phenomena.
-
- bzip2 usually allocates several megabytes of memory to
- operate in, and then charges all over it in a fairly ran-
- dom fashion. This means that performance, both for com-
- pressing and decompressing, is largely determined by the
- speed at which your machine can service cache misses.
- Because of this, small changes to the code to reduce the
- miss rate have been observed to give disproportionately
- large performance improvements. I imagine bzip2 will per-
- form best on machines with very large caches.
-
-
-CAVEATS
- I/O error messages are not as helpful as they could be.
- bzip2 tries hard to detect I/O errors and exit cleanly,
- but the details of what the problem is sometimes seem
- rather misleading.
-
- This manual page pertains to version 1.0 of bzip2. Com-
- pressed data created by this version is entirely forwards
- and backwards compatible with the previous public
- releases, versions 0.1pl2, 0.9.0 and 0.9.5, but with the
- following exception: 0.9.0 and above can correctly decom-
- press multiple concatenated compressed files. 0.1pl2 can-
- not do this; it will stop after decompressing just the
- first file in the stream.
-
- bzip2recover uses 32-bit integers to represent bit posi-
- tions in compressed files, so it cannot handle compressed
- files more than 512 megabytes long. This could easily be
- fixed.
-
-
-AUTHOR
- Julian Seward, jseward@acm.org.
-
- http://sourceware.cygnus.com/bzip2
- http://www.muraroa.demon.co.uk
-
- The ideas embodied in bzip2 are due to (at least) the fol-
- lowing people: Michael Burrows and David Wheeler (for the
- block sorting transformation), David Wheeler (again, for
- the Huffman coder), Peter Fenwick (for the structured cod-
- ing model in the original bzip, and many refinements), and
- Alistair Moffat, Radford Neal and Ian Witten (for the
- arithmetic coder in the original bzip). I am much
- indebted for their help, support and advice. See the man-
- ual in the source distribution for pointers to sources of
- documentation. Christian von Roques encouraged me to look
- for faster sorting algorithms, so as to speed up compres-
- sion. Bela Lubkin encouraged me to improve the worst-case
- compression performance. Many people sent patches, helped
- with portability problems, lent machines, gave advice and
- were generally helpful.
-
+++ /dev/null
-
-/*-----------------------------------------------------------*/
-/*--- Block recoverer program for bzip2 ---*/
-/*--- bzip2recover.c ---*/
-/*-----------------------------------------------------------*/
-
-/*--
- This program is bzip2recover, a program to attempt data
- salvage from damaged files created by the accompanying
- bzip2-1.0 program.
-
- Copyright (C) 1996-2000 Julian R Seward. All rights reserved.
-
- Redistribution and use in source and binary forms, with or without
- modification, are permitted provided that the following conditions
- are met:
-
- 1. Redistributions of source code must retain the above copyright
- notice, this list of conditions and the following disclaimer.
-
- 2. The origin of this software must not be misrepresented; you must
- not claim that you wrote the original software. If you use this
- software in a product, an acknowledgment in the product
- documentation would be appreciated but is not required.
-
- 3. Altered source versions must be plainly marked as such, and must
- not be misrepresented as being the original software.
-
- 4. The name of the author may not be used to endorse or promote
- products derived from this software without specific prior written
- permission.
-
- THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
- OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
- DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
- GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
- Julian Seward, Cambridge, UK.
- jseward@acm.org
- bzip2/libbzip2 version 1.0 of 21 March 2000
---*/
-
-/*--
- This program is a complete hack and should be rewritten
- properly. It isn't very complicated.
---*/
-
-#include <stdio.h>
-#include <errno.h>
-#include <stdlib.h>
-#include <string.h>
-
-typedef unsigned int UInt32;
-typedef int Int32;
-typedef unsigned char UChar;
-typedef char Char;
-typedef unsigned char Bool;
-#define True ((Bool)1)
-#define False ((Bool)0)
-
-
-Char inFileName[2000];
-Char outFileName[2000];
-Char progName[2000];
-
-UInt32 bytesOut = 0;
-UInt32 bytesIn = 0;
-
-
-/*---------------------------------------------------*/
-/*--- I/O errors ---*/
-/*---------------------------------------------------*/
-
-/*---------------------------------------------*/
-void readError ( void )
-{
- fprintf ( stderr,
- "%s: I/O error reading `%s', possible reason follows.\n",
- progName, inFileName );
- perror ( progName );
- fprintf ( stderr, "%s: warning: output file(s) may be incomplete.\n",
- progName );
- exit ( 1 );
-}
-
-
-/*---------------------------------------------*/
-void writeError ( void )
-{
- fprintf ( stderr,
- "%s: I/O error reading `%s', possible reason follows.\n",
- progName, inFileName );
- perror ( progName );
- fprintf ( stderr, "%s: warning: output file(s) may be incomplete.\n",
- progName );
- exit ( 1 );
-}
-
-
-/*---------------------------------------------*/
-void mallocFail ( Int32 n )
-{
- fprintf ( stderr,
- "%s: malloc failed on request for %d bytes.\n",
- progName, n );
- fprintf ( stderr, "%s: warning: output file(s) may be incomplete.\n",
- progName );
- exit ( 1 );
-}
-
-
-/*---------------------------------------------------*/
-/*--- Bit stream I/O ---*/
-/*---------------------------------------------------*/
-
-typedef
- struct {
- FILE* handle;
- Int32 buffer;
- Int32 buffLive;
- Char mode;
- }
- BitStream;
-
-
-/*---------------------------------------------*/
-BitStream* bsOpenReadStream ( FILE* stream )
-{
- BitStream *bs = malloc ( sizeof(BitStream) );
- if (bs == NULL) mallocFail ( sizeof(BitStream) );
- bs->handle = stream;
- bs->buffer = 0;
- bs->buffLive = 0;
- bs->mode = 'r';
- return bs;
-}
-
-
-/*---------------------------------------------*/
-BitStream* bsOpenWriteStream ( FILE* stream )
-{
- BitStream *bs = malloc ( sizeof(BitStream) );
- if (bs == NULL) mallocFail ( sizeof(BitStream) );
- bs->handle = stream;
- bs->buffer = 0;
- bs->buffLive = 0;
- bs->mode = 'w';
- return bs;
-}
-
-
-/*---------------------------------------------*/
-void bsPutBit ( BitStream* bs, Int32 bit )
-{
- if (bs->buffLive == 8) {
- Int32 retVal = putc ( (UChar) bs->buffer, bs->handle );
- if (retVal == EOF) writeError();
- bytesOut++;
- bs->buffLive = 1;
- bs->buffer = bit & 0x1;
- } else {
- bs->buffer = ( (bs->buffer << 1) | (bit & 0x1) );
- bs->buffLive++;
- };
-}
-
-
-/*---------------------------------------------*/
-/*--
- Returns 0 or 1, or 2 to indicate EOF.
---*/
-Int32 bsGetBit ( BitStream* bs )
-{
- if (bs->buffLive > 0) {
- bs->buffLive --;
- return ( ((bs->buffer) >> (bs->buffLive)) & 0x1 );
- } else {
- Int32 retVal = getc ( bs->handle );
- if ( retVal == EOF ) {
- if (errno != 0) readError();
- return 2;
- }
- bs->buffLive = 7;
- bs->buffer = retVal;
- return ( ((bs->buffer) >> 7) & 0x1 );
- }
-}
-
-
-/*---------------------------------------------*/
-void bsClose ( BitStream* bs )
-{
- Int32 retVal;
-
- if ( bs->mode == 'w' ) {
- while ( bs->buffLive < 8 ) {
- bs->buffLive++;
- bs->buffer <<= 1;
- };
- retVal = putc ( (UChar) (bs->buffer), bs->handle );
- if (retVal == EOF) writeError();
- bytesOut++;
- retVal = fflush ( bs->handle );
- if (retVal == EOF) writeError();
- }
- retVal = fclose ( bs->handle );
- if (retVal == EOF) {
- if (bs->mode == 'w') writeError(); else readError();
- }
- free ( bs );
-}
-
-
-/*---------------------------------------------*/
-void bsPutUChar ( BitStream* bs, UChar c )
-{
- Int32 i;
- for (i = 7; i >= 0; i--)
- bsPutBit ( bs, (((UInt32) c) >> i) & 0x1 );
-}
-
-
-/*---------------------------------------------*/
-void bsPutUInt32 ( BitStream* bs, UInt32 c )
-{
- Int32 i;
-
- for (i = 31; i >= 0; i--)
- bsPutBit ( bs, (c >> i) & 0x1 );
-}
-
-
-/*---------------------------------------------*/
-Bool endsInBz2 ( Char* name )
-{
- Int32 n = strlen ( name );
- if (n <= 4) return False;
- return
- (name[n-4] == '.' &&
- name[n-3] == 'b' &&
- name[n-2] == 'z' &&
- name[n-1] == '2');
-}
-
-
-/*---------------------------------------------------*/
-/*--- ---*/
-/*---------------------------------------------------*/
-
-#define BLOCK_HEADER_HI 0x00003141UL
-#define BLOCK_HEADER_LO 0x59265359UL
-
-#define BLOCK_ENDMARK_HI 0x00001772UL
-#define BLOCK_ENDMARK_LO 0x45385090UL
-
-
-UInt32 bStart[20000];
-UInt32 bEnd[20000];
-UInt32 rbStart[20000];
-UInt32 rbEnd[20000];
-
-Int32 main ( Int32 argc, Char** argv )
-{
- FILE* inFile;
- FILE* outFile;
- BitStream* bsIn, *bsWr;
- Int32 currBlock, b, wrBlock;
- UInt32 bitsRead;
- Int32 rbCtr;
-
-
- UInt32 buffHi, buffLo, blockCRC;
- Char* p;
-
- strcpy ( progName, argv[0] );
- inFileName[0] = outFileName[0] = 0;
-
- fprintf ( stderr, "bzip2recover 1.0: extracts blocks from damaged .bz2 files.\n" );
-
- if (argc != 2) {
- fprintf ( stderr, "%s: usage is `%s damaged_file_name'.\n",
- progName, progName );
- exit(1);
- }
-
- strcpy ( inFileName, argv[1] );
-
- inFile = fopen ( inFileName, "rb" );
- if (inFile == NULL) {
- fprintf ( stderr, "%s: can't read `%s'\n", progName, inFileName );
- exit(1);
- }
-
- bsIn = bsOpenReadStream ( inFile );
- fprintf ( stderr, "%s: searching for block boundaries ...\n", progName );
-
- bitsRead = 0;
- buffHi = buffLo = 0;
- currBlock = 0;
- bStart[currBlock] = 0;
-
- rbCtr = 0;
-
- while (True) {
- b = bsGetBit ( bsIn );
- bitsRead++;
- if (b == 2) {
- if (bitsRead >= bStart[currBlock] &&
- (bitsRead - bStart[currBlock]) >= 40) {
- bEnd[currBlock] = bitsRead-1;
- if (currBlock > 0)
- fprintf ( stderr, " block %d runs from %d to %d (incomplete)\n",
- currBlock, bStart[currBlock], bEnd[currBlock] );
- } else
- currBlock--;
- break;
- }
- buffHi = (buffHi << 1) | (buffLo >> 31);
- buffLo = (buffLo << 1) | (b & 1);
- if ( ( (buffHi & 0x0000ffff) == BLOCK_HEADER_HI
- && buffLo == BLOCK_HEADER_LO)
- ||
- ( (buffHi & 0x0000ffff) == BLOCK_ENDMARK_HI
- && buffLo == BLOCK_ENDMARK_LO)
- ) {
- if (bitsRead > 49)
- bEnd[currBlock] = bitsRead-49; else
- bEnd[currBlock] = 0;
- if (currBlock > 0 &&
- (bEnd[currBlock] - bStart[currBlock]) >= 130) {
- fprintf ( stderr, " block %d runs from %d to %d\n",
- rbCtr+1, bStart[currBlock], bEnd[currBlock] );
- rbStart[rbCtr] = bStart[currBlock];
- rbEnd[rbCtr] = bEnd[currBlock];
- rbCtr++;
- }
- currBlock++;
-
- bStart[currBlock] = bitsRead;
- }
- }
-
- bsClose ( bsIn );
-
- /*-- identified blocks run from 1 to rbCtr inclusive. --*/
-
- if (rbCtr < 1) {
- fprintf ( stderr,
- "%s: sorry, I couldn't find any block boundaries.\n",
- progName );
- exit(1);
- };
-
- fprintf ( stderr, "%s: splitting into blocks\n", progName );
-
- inFile = fopen ( inFileName, "rb" );
- if (inFile == NULL) {
- fprintf ( stderr, "%s: can't open `%s'\n", progName, inFileName );
- exit(1);
- }
- bsIn = bsOpenReadStream ( inFile );
-
- /*-- placate gcc's dataflow analyser --*/
- blockCRC = 0; bsWr = 0;
-
- bitsRead = 0;
- outFile = NULL;
- wrBlock = 0;
- while (True) {
- b = bsGetBit(bsIn);
- if (b == 2) break;
- buffHi = (buffHi << 1) | (buffLo >> 31);
- buffLo = (buffLo << 1) | (b & 1);
- if (bitsRead == 47+rbStart[wrBlock])
- blockCRC = (buffHi << 16) | (buffLo >> 16);
-
- if (outFile != NULL && bitsRead >= rbStart[wrBlock]
- && bitsRead <= rbEnd[wrBlock]) {
- bsPutBit ( bsWr, b );
- }
-
- bitsRead++;
-
- if (bitsRead == rbEnd[wrBlock]+1) {
- if (outFile != NULL) {
- bsPutUChar ( bsWr, 0x17 ); bsPutUChar ( bsWr, 0x72 );
- bsPutUChar ( bsWr, 0x45 ); bsPutUChar ( bsWr, 0x38 );
- bsPutUChar ( bsWr, 0x50 ); bsPutUChar ( bsWr, 0x90 );
- bsPutUInt32 ( bsWr, blockCRC );
- bsClose ( bsWr );
- }
- if (wrBlock >= rbCtr) break;
- wrBlock++;
- } else
- if (bitsRead == rbStart[wrBlock]) {
- outFileName[0] = 0;
- sprintf ( outFileName, "rec%4d", wrBlock+1 );
- for (p = outFileName; *p != 0; p++) if (*p == ' ') *p = '0';
- strcat ( outFileName, inFileName );
- if ( !endsInBz2(outFileName)) strcat ( outFileName, ".bz2" );
-
- fprintf ( stderr, " writing block %d to `%s' ...\n",
- wrBlock+1, outFileName );
-
- outFile = fopen ( outFileName, "wb" );
- if (outFile == NULL) {
- fprintf ( stderr, "%s: can't write `%s'\n",
- progName, outFileName );
- exit(1);
- }
- bsWr = bsOpenWriteStream ( outFile );
- bsPutUChar ( bsWr, 'B' ); bsPutUChar ( bsWr, 'Z' );
- bsPutUChar ( bsWr, 'h' ); bsPutUChar ( bsWr, '9' );
- bsPutUChar ( bsWr, 0x31 ); bsPutUChar ( bsWr, 0x41 );
- bsPutUChar ( bsWr, 0x59 ); bsPutUChar ( bsWr, 0x26 );
- bsPutUChar ( bsWr, 0x53 ); bsPutUChar ( bsWr, 0x59 );
- }
- }
-
- fprintf ( stderr, "%s: finished\n", progName );
- return 0;
-}
-
-
-
-/*-----------------------------------------------------------*/
-/*--- end bzip2recover.c ---*/
-/*-----------------------------------------------------------*/
+++ /dev/null
-
-/*-------------------------------------------------------------*/
-/*--- Library top-level functions. ---*/
-/*--- bzlib.c ---*/
-/*-------------------------------------------------------------*/
-
-/*--
- This file is a part of bzip2 and/or libbzip2, a program and
- library for lossless, block-sorting data compression.
-
- Copyright (C) 1996-2000 Julian R Seward. All rights reserved.
-
- Redistribution and use in source and binary forms, with or without
- modification, are permitted provided that the following conditions
- are met:
-
- 1. Redistributions of source code must retain the above copyright
- notice, this list of conditions and the following disclaimer.
-
- 2. The origin of this software must not be misrepresented; you must
- not claim that you wrote the original software. If you use this
- software in a product, an acknowledgment in the product
- documentation would be appreciated but is not required.
-
- 3. Altered source versions must be plainly marked as such, and must
- not be misrepresented as being the original software.
-
- 4. The name of the author may not be used to endorse or promote
- products derived from this software without specific prior written
- permission.
-
- THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
- OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
- DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
- GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
- Julian Seward, Cambridge, UK.
- jseward@acm.org
- bzip2/libbzip2 version 1.0 of 21 March 2000
-
- This program is based on (at least) the work of:
- Mike Burrows
- David Wheeler
- Peter Fenwick
- Alistair Moffat
- Radford Neal
- Ian H. Witten
- Robert Sedgewick
- Jon L. Bentley
-
- For more information on these sources, see the manual.
---*/
-
-/*--
- CHANGES
- ~~~~~~~
- 0.9.0 -- original version.
-
- 0.9.0a/b -- no changes in this file.
-
- 0.9.0c
- * made zero-length BZ_FLUSH work correctly in bzCompress().
- * fixed bzWrite/bzRead to ignore zero-length requests.
- * fixed bzread to correctly handle read requests after EOF.
- * wrong parameter order in call to bzDecompressInit in
- bzBuffToBuffDecompress. Fixed.
---*/
-
-#include "bzlib_private.h"
-
-
-/*---------------------------------------------------*/
-/*--- Compression stuff ---*/
-/*---------------------------------------------------*/
-
-
-/*---------------------------------------------------*/
-#ifndef BZ_NO_STDIO
-void BZ2_bz__AssertH__fail ( int errcode )
-{
- fprintf(stderr,
- "\n\nbzip2/libbzip2: internal error number %d.\n"
- "This is a bug in bzip2/libbzip2, %s.\n"
- "Please report it to me at: jseward@acm.org. If this happened\n"
- "when you were using some program which uses libbzip2 as a\n"
- "component, you should also report this bug to the author(s)\n"
- "of that program. Please make an effort to report this bug;\n"
- "timely and accurate bug reports eventually lead to higher\n"
- "quality software. Thanks. Julian Seward, 21 March 2000.\n\n",
- errcode,
- BZ2_bzlibVersion()
- );
- exit(3);
-}
-#endif
-
-
-/*---------------------------------------------------*/
-static
-int bz_config_ok ( void )
-{
- if (sizeof(int) != 4) return 0;
- if (sizeof(short) != 2) return 0;
- if (sizeof(char) != 1) return 0;
- return 1;
-}
-
-
-/*---------------------------------------------------*/
-static
-void* default_bzalloc ( void* opaque, Int32 items, Int32 size )
-{
- void* v = malloc ( items * size );
- return v;
-}
-
-static
-void default_bzfree ( void* opaque, void* addr )
-{
- if (addr != NULL) free ( addr );
-}
-
-
-/*---------------------------------------------------*/
-static
-void prepare_new_block ( EState* s )
-{
- Int32 i;
- s->nblock = 0;
- s->numZ = 0;
- s->state_out_pos = 0;
- BZ_INITIALISE_CRC ( s->blockCRC );
- for (i = 0; i < 256; i++) s->inUse[i] = False;
- s->blockNo++;
-}
-
-
-/*---------------------------------------------------*/
-static
-void init_RL ( EState* s )
-{
- s->state_in_ch = 256;
- s->state_in_len = 0;
-}
-
-
-static
-Bool isempty_RL ( EState* s )
-{
- if (s->state_in_ch < 256 && s->state_in_len > 0)
- return False; else
- return True;
-}
-
-
-/*---------------------------------------------------*/
-int BZ_API(BZ2_bzCompressInit)
- ( bz_stream* strm,
- int blockSize100k,
- int verbosity,
- int workFactor )
-{
- Int32 n;
- EState* s;
-
- if (!bz_config_ok()) return BZ_CONFIG_ERROR;
-
- if (strm == NULL ||
- blockSize100k < 1 || blockSize100k > 9 ||
- workFactor < 0 || workFactor > 250)
- return BZ_PARAM_ERROR;
-
- if (workFactor == 0) workFactor = 30;
- if (strm->bzalloc == NULL) strm->bzalloc = default_bzalloc;
- if (strm->bzfree == NULL) strm->bzfree = default_bzfree;
-
- s = BZALLOC( sizeof(EState) );
- if (s == NULL) return BZ_MEM_ERROR;
- s->strm = strm;
-
- s->arr1 = NULL;
- s->arr2 = NULL;
- s->ftab = NULL;
-
- n = 100000 * blockSize100k;
- s->arr1 = BZALLOC( n * sizeof(UInt32) );
- s->arr2 = BZALLOC( (n+BZ_N_OVERSHOOT) * sizeof(UInt32) );
- s->ftab = BZALLOC( 65537 * sizeof(UInt32) );
-
- if (s->arr1 == NULL || s->arr2 == NULL || s->ftab == NULL) {
- if (s->arr1 != NULL) BZFREE(s->arr1);
- if (s->arr2 != NULL) BZFREE(s->arr2);
- if (s->ftab != NULL) BZFREE(s->ftab);
- if (s != NULL) BZFREE(s);
- return BZ_MEM_ERROR;
- }
-
- s->blockNo = 0;
- s->state = BZ_S_INPUT;
- s->mode = BZ_M_RUNNING;
- s->combinedCRC = 0;
- s->blockSize100k = blockSize100k;
- s->nblockMAX = 100000 * blockSize100k - 19;
- s->verbosity = verbosity;
- s->workFactor = workFactor;
-
- s->block = (UChar*)s->arr2;
- s->mtfv = (UInt16*)s->arr1;
- s->zbits = NULL;
- s->ptr = (UInt32*)s->arr1;
-
- strm->state = s;
- strm->total_in_lo32 = 0;
- strm->total_in_hi32 = 0;
- strm->total_out_lo32 = 0;
- strm->total_out_hi32 = 0;
- init_RL ( s );
- prepare_new_block ( s );
- return BZ_OK;
-}
-
-
-/*---------------------------------------------------*/
-static
-void add_pair_to_block ( EState* s )
-{
- Int32 i;
- UChar ch = (UChar)(s->state_in_ch);
- for (i = 0; i < s->state_in_len; i++) {
- BZ_UPDATE_CRC( s->blockCRC, ch );
- }
- s->inUse[s->state_in_ch] = True;
- switch (s->state_in_len) {
- case 1:
- s->block[s->nblock] = (UChar)ch; s->nblock++;
- break;
- case 2:
- s->block[s->nblock] = (UChar)ch; s->nblock++;
- s->block[s->nblock] = (UChar)ch; s->nblock++;
- break;
- case 3:
- s->block[s->nblock] = (UChar)ch; s->nblock++;
- s->block[s->nblock] = (UChar)ch; s->nblock++;
- s->block[s->nblock] = (UChar)ch; s->nblock++;
- break;
- default:
- s->inUse[s->state_in_len-4] = True;
- s->block[s->nblock] = (UChar)ch; s->nblock++;
- s->block[s->nblock] = (UChar)ch; s->nblock++;
- s->block[s->nblock] = (UChar)ch; s->nblock++;
- s->block[s->nblock] = (UChar)ch; s->nblock++;
- s->block[s->nblock] = ((UChar)(s->state_in_len-4));
- s->nblock++;
- break;
- }
-}
-
-
-/*---------------------------------------------------*/
-static
-void flush_RL ( EState* s )
-{
- if (s->state_in_ch < 256) add_pair_to_block ( s );
- init_RL ( s );
-}
-
-
-/*---------------------------------------------------*/
-#define ADD_CHAR_TO_BLOCK(zs,zchh0) \
-{ \
- UInt32 zchh = (UInt32)(zchh0); \
- /*-- fast track the common case --*/ \
- if (zchh != zs->state_in_ch && \
- zs->state_in_len == 1) { \
- UChar ch = (UChar)(zs->state_in_ch); \
- BZ_UPDATE_CRC( zs->blockCRC, ch ); \
- zs->inUse[zs->state_in_ch] = True; \
- zs->block[zs->nblock] = (UChar)ch; \
- zs->nblock++; \
- zs->state_in_ch = zchh; \
- } \
- else \
- /*-- general, uncommon cases --*/ \
- if (zchh != zs->state_in_ch || \
- zs->state_in_len == 255) { \
- if (zs->state_in_ch < 256) \
- add_pair_to_block ( zs ); \
- zs->state_in_ch = zchh; \
- zs->state_in_len = 1; \
- } else { \
- zs->state_in_len++; \
- } \
-}
-
-
-/*---------------------------------------------------*/
-static
-Bool copy_input_until_stop ( EState* s )
-{
- Bool progress_in = False;
-
- if (s->mode == BZ_M_RUNNING) {
-
- /*-- fast track the common case --*/
- while (True) {
- /*-- block full? --*/
- if (s->nblock >= s->nblockMAX) break;
- /*-- no input? --*/
- if (s->strm->avail_in == 0) break;
- progress_in = True;
- ADD_CHAR_TO_BLOCK ( s, (UInt32)(*((UChar*)(s->strm->next_in))) );
- s->strm->next_in++;
- s->strm->avail_in--;
- s->strm->total_in_lo32++;
- if (s->strm->total_in_lo32 == 0) s->strm->total_in_hi32++;
- }
-
- } else {
-
- /*-- general, uncommon case --*/
- while (True) {
- /*-- block full? --*/
- if (s->nblock >= s->nblockMAX) break;
- /*-- no input? --*/
- if (s->strm->avail_in == 0) break;
- /*-- flush/finish end? --*/
- if (s->avail_in_expect == 0) break;
- progress_in = True;
- ADD_CHAR_TO_BLOCK ( s, (UInt32)(*((UChar*)(s->strm->next_in))) );
- s->strm->next_in++;
- s->strm->avail_in--;
- s->strm->total_in_lo32++;
- if (s->strm->total_in_lo32 == 0) s->strm->total_in_hi32++;
- s->avail_in_expect--;
- }
- }
- return progress_in;
-}
-
-
-/*---------------------------------------------------*/
-static
-Bool copy_output_until_stop ( EState* s )
-{
- Bool progress_out = False;
-
- while (True) {
-
- /*-- no output space? --*/
- if (s->strm->avail_out == 0) break;
-
- /*-- block done? --*/
- if (s->state_out_pos >= s->numZ) break;
-
- progress_out = True;
- *(s->strm->next_out) = s->zbits[s->state_out_pos];
- s->state_out_pos++;
- s->strm->avail_out--;
- s->strm->next_out++;
- s->strm->total_out_lo32++;
- if (s->strm->total_out_lo32 == 0) s->strm->total_out_hi32++;
- }
-
- return progress_out;
-}
-
-
-/*---------------------------------------------------*/
-static
-Bool handle_compress ( bz_stream* strm )
-{
- Bool progress_in = False;
- Bool progress_out = False;
- EState* s = strm->state;
-
- while (True) {
-
- if (s->state == BZ_S_OUTPUT) {
- progress_out |= copy_output_until_stop ( s );
- if (s->state_out_pos < s->numZ) break;
- if (s->mode == BZ_M_FINISHING &&
- s->avail_in_expect == 0 &&
- isempty_RL(s)) break;
- prepare_new_block ( s );
- s->state = BZ_S_INPUT;
- if (s->mode == BZ_M_FLUSHING &&
- s->avail_in_expect == 0 &&
- isempty_RL(s)) break;
- }
-
- if (s->state == BZ_S_INPUT) {
- progress_in |= copy_input_until_stop ( s );
- if (s->mode != BZ_M_RUNNING && s->avail_in_expect == 0) {
- flush_RL ( s );
- BZ2_compressBlock ( s, (Bool)(s->mode == BZ_M_FINISHING) );
- s->state = BZ_S_OUTPUT;
- }
- else
- if (s->nblock >= s->nblockMAX) {
- BZ2_compressBlock ( s, False );
- s->state = BZ_S_OUTPUT;
- }
- else
- if (s->strm->avail_in == 0) {
- break;
- }
- }
-
- }
-
- return progress_in || progress_out;
-}
-
-
-/*---------------------------------------------------*/
-int BZ_API(BZ2_bzCompress) ( bz_stream *strm, int action )
-{
- Bool progress;
- EState* s;
- if (strm == NULL) return BZ_PARAM_ERROR;
- s = strm->state;
- if (s == NULL) return BZ_PARAM_ERROR;
- if (s->strm != strm) return BZ_PARAM_ERROR;
-
- preswitch:
- switch (s->mode) {
-
- case BZ_M_IDLE:
- return BZ_SEQUENCE_ERROR;
-
- case BZ_M_RUNNING:
- if (action == BZ_RUN) {
- progress = handle_compress ( strm );
- return progress ? BZ_RUN_OK : BZ_PARAM_ERROR;
- }
- else
- if (action == BZ_FLUSH) {
- s->avail_in_expect = strm->avail_in;
- s->mode = BZ_M_FLUSHING;
- goto preswitch;
- }
- else
- if (action == BZ_FINISH) {
- s->avail_in_expect = strm->avail_in;
- s->mode = BZ_M_FINISHING;
- goto preswitch;
- }
- else
- return BZ_PARAM_ERROR;
-
- case BZ_M_FLUSHING:
- if (action != BZ_FLUSH) return BZ_SEQUENCE_ERROR;
- if (s->avail_in_expect != s->strm->avail_in)
- return BZ_SEQUENCE_ERROR;
- progress = handle_compress ( strm );
- if (s->avail_in_expect > 0 || !isempty_RL(s) ||
- s->state_out_pos < s->numZ) return BZ_FLUSH_OK;
- s->mode = BZ_M_RUNNING;
- return BZ_RUN_OK;
-
- case BZ_M_FINISHING:
- if (action != BZ_FINISH) return BZ_SEQUENCE_ERROR;
- if (s->avail_in_expect != s->strm->avail_in)
- return BZ_SEQUENCE_ERROR;
- progress = handle_compress ( strm );
- if (!progress) return BZ_SEQUENCE_ERROR;
- if (s->avail_in_expect > 0 || !isempty_RL(s) ||
- s->state_out_pos < s->numZ) return BZ_FINISH_OK;
- s->mode = BZ_M_IDLE;
- return BZ_STREAM_END;
- }
- return BZ_OK; /*--not reached--*/
-}
-
-
-/*---------------------------------------------------*/
-int BZ_API(BZ2_bzCompressEnd) ( bz_stream *strm )
-{
- EState* s;
- if (strm == NULL) return BZ_PARAM_ERROR;
- s = strm->state;
- if (s == NULL) return BZ_PARAM_ERROR;
- if (s->strm != strm) return BZ_PARAM_ERROR;
-
- if (s->arr1 != NULL) BZFREE(s->arr1);
- if (s->arr2 != NULL) BZFREE(s->arr2);
- if (s->ftab != NULL) BZFREE(s->ftab);
- BZFREE(strm->state);
-
- strm->state = NULL;
-
- return BZ_OK;
-}
-
-
-/*---------------------------------------------------*/
-/*--- Decompression stuff ---*/
-/*---------------------------------------------------*/
-
-/*---------------------------------------------------*/
-int BZ_API(BZ2_bzDecompressInit)
- ( bz_stream* strm,
- int verbosity,
- int small )
-{
- DState* s;
-
- if (!bz_config_ok()) return BZ_CONFIG_ERROR;
-
- if (strm == NULL) return BZ_PARAM_ERROR;
- if (small != 0 && small != 1) return BZ_PARAM_ERROR;
- if (verbosity < 0 || verbosity > 4) return BZ_PARAM_ERROR;
-
- if (strm->bzalloc == NULL) strm->bzalloc = default_bzalloc;
- if (strm->bzfree == NULL) strm->bzfree = default_bzfree;
-
- s = BZALLOC( sizeof(DState) );
- if (s == NULL) return BZ_MEM_ERROR;
- s->strm = strm;
- strm->state = s;
- s->state = BZ_X_MAGIC_1;
- s->bsLive = 0;
- s->bsBuff = 0;
- s->calculatedCombinedCRC = 0;
- strm->total_in_lo32 = 0;
- strm->total_in_hi32 = 0;
- strm->total_out_lo32 = 0;
- strm->total_out_hi32 = 0;
- s->smallDecompress = (Bool)small;
- s->ll4 = NULL;
- s->ll16 = NULL;
- s->tt = NULL;
- s->currBlockNo = 0;
- s->verbosity = verbosity;
-
- return BZ_OK;
-}
-
-
-/*---------------------------------------------------*/
-static
-void unRLE_obuf_to_output_FAST ( DState* s )
-{
- UChar k1;
-
- if (s->blockRandomised) {
-
- while (True) {
- /* try to finish existing run */
- while (True) {
- if (s->strm->avail_out == 0) return;
- if (s->state_out_len == 0) break;
- *( (UChar*)(s->strm->next_out) ) = s->state_out_ch;
- BZ_UPDATE_CRC ( s->calculatedBlockCRC, s->state_out_ch );
- s->state_out_len--;
- s->strm->next_out++;
- s->strm->avail_out--;
- s->strm->total_out_lo32++;
- if (s->strm->total_out_lo32 == 0) s->strm->total_out_hi32++;
- }
-
- /* can a new run be started? */
- if (s->nblock_used == s->save_nblock+1) return;
-
-
- s->state_out_len = 1;
- s->state_out_ch = s->k0;
- BZ_GET_FAST(k1); BZ_RAND_UPD_MASK;
- k1 ^= BZ_RAND_MASK; s->nblock_used++;
- if (s->nblock_used == s->save_nblock+1) continue;
- if (k1 != s->k0) { s->k0 = k1; continue; };
-
- s->state_out_len = 2;
- BZ_GET_FAST(k1); BZ_RAND_UPD_MASK;
- k1 ^= BZ_RAND_MASK; s->nblock_used++;
- if (s->nblock_used == s->save_nblock+1) continue;
- if (k1 != s->k0) { s->k0 = k1; continue; };
-
- s->state_out_len = 3;
- BZ_GET_FAST(k1); BZ_RAND_UPD_MASK;
- k1 ^= BZ_RAND_MASK; s->nblock_used++;
- if (s->nblock_used == s->save_nblock+1) continue;
- if (k1 != s->k0) { s->k0 = k1; continue; };
-
- BZ_GET_FAST(k1); BZ_RAND_UPD_MASK;
- k1 ^= BZ_RAND_MASK; s->nblock_used++;
- s->state_out_len = ((Int32)k1) + 4;
- BZ_GET_FAST(s->k0); BZ_RAND_UPD_MASK;
- s->k0 ^= BZ_RAND_MASK; s->nblock_used++;
- }
-
- } else {
-
- /* restore */
- UInt32 c_calculatedBlockCRC = s->calculatedBlockCRC;
- UChar c_state_out_ch = s->state_out_ch;
- Int32 c_state_out_len = s->state_out_len;
- Int32 c_nblock_used = s->nblock_used;
- Int32 c_k0 = s->k0;
- UInt32* c_tt = s->tt;
- UInt32 c_tPos = s->tPos;
- char* cs_next_out = s->strm->next_out;
- unsigned int cs_avail_out = s->strm->avail_out;
- /* end restore */
-
- UInt32 avail_out_INIT = cs_avail_out;
- Int32 s_save_nblockPP = s->save_nblock+1;
- unsigned int total_out_lo32_old;
-
- while (True) {
-
- /* try to finish existing run */
- if (c_state_out_len > 0) {
- while (True) {
- if (cs_avail_out == 0) goto return_notr;
- if (c_state_out_len == 1) break;
- *( (UChar*)(cs_next_out) ) = c_state_out_ch;
- BZ_UPDATE_CRC ( c_calculatedBlockCRC, c_state_out_ch );
- c_state_out_len--;
- cs_next_out++;
- cs_avail_out--;
- }
- s_state_out_len_eq_one:
- {
- if (cs_avail_out == 0) {
- c_state_out_len = 1; goto return_notr;
- };
- *( (UChar*)(cs_next_out) ) = c_state_out_ch;
- BZ_UPDATE_CRC ( c_calculatedBlockCRC, c_state_out_ch );
- cs_next_out++;
- cs_avail_out--;
- }
- }
- /* can a new run be started? */
- if (c_nblock_used == s_save_nblockPP) {
- c_state_out_len = 0; goto return_notr;
- };
- c_state_out_ch = c_k0;
- BZ_GET_FAST_C(k1); c_nblock_used++;
- if (k1 != c_k0) {
- c_k0 = k1; goto s_state_out_len_eq_one;
- };
- if (c_nblock_used == s_save_nblockPP)
- goto s_state_out_len_eq_one;
-
- c_state_out_len = 2;
- BZ_GET_FAST_C(k1); c_nblock_used++;
- if (c_nblock_used == s_save_nblockPP) continue;
- if (k1 != c_k0) { c_k0 = k1; continue; };
-
- c_state_out_len = 3;
- BZ_GET_FAST_C(k1); c_nblock_used++;
- if (c_nblock_used == s_save_nblockPP) continue;
- if (k1 != c_k0) { c_k0 = k1; continue; };
-
- BZ_GET_FAST_C(k1); c_nblock_used++;
- c_state_out_len = ((Int32)k1) + 4;
- BZ_GET_FAST_C(c_k0); c_nblock_used++;
- }
-
- return_notr:
- total_out_lo32_old = s->strm->total_out_lo32;
- s->strm->total_out_lo32 += (avail_out_INIT - cs_avail_out);
- if (s->strm->total_out_lo32 < total_out_lo32_old)
- s->strm->total_out_hi32++;
-
- /* save */
- s->calculatedBlockCRC = c_calculatedBlockCRC;
- s->state_out_ch = c_state_out_ch;
- s->state_out_len = c_state_out_len;
- s->nblock_used = c_nblock_used;
- s->k0 = c_k0;
- s->tt = c_tt;
- s->tPos = c_tPos;
- s->strm->next_out = cs_next_out;
- s->strm->avail_out = cs_avail_out;
- /* end save */
- }
-}
-
-
-
-/*---------------------------------------------------*/
-__inline__ Int32 BZ2_indexIntoF ( Int32 indx, Int32 *cftab )
-{
- Int32 nb, na, mid;
- nb = 0;
- na = 256;
- do {
- mid = (nb + na) >> 1;
- if (indx >= cftab[mid]) nb = mid; else na = mid;
- }
- while (na - nb != 1);
- return nb;
-}
-
-
-/*---------------------------------------------------*/
-static
-void unRLE_obuf_to_output_SMALL ( DState* s )
-{
- UChar k1;
-
- if (s->blockRandomised) {
-
- while (True) {
- /* try to finish existing run */
- while (True) {
- if (s->strm->avail_out == 0) return;
- if (s->state_out_len == 0) break;
- *( (UChar*)(s->strm->next_out) ) = s->state_out_ch;
- BZ_UPDATE_CRC ( s->calculatedBlockCRC, s->state_out_ch );
- s->state_out_len--;
- s->strm->next_out++;
- s->strm->avail_out--;
- s->strm->total_out_lo32++;
- if (s->strm->total_out_lo32 == 0) s->strm->total_out_hi32++;
- }
-
- /* can a new run be started? */
- if (s->nblock_used == s->save_nblock+1) return;
-
-
- s->state_out_len = 1;
- s->state_out_ch = s->k0;
- BZ_GET_SMALL(k1); BZ_RAND_UPD_MASK;
- k1 ^= BZ_RAND_MASK; s->nblock_used++;
- if (s->nblock_used == s->save_nblock+1) continue;
- if (k1 != s->k0) { s->k0 = k1; continue; };
-
- s->state_out_len = 2;
- BZ_GET_SMALL(k1); BZ_RAND_UPD_MASK;
- k1 ^= BZ_RAND_MASK; s->nblock_used++;
- if (s->nblock_used == s->save_nblock+1) continue;
- if (k1 != s->k0) { s->k0 = k1; continue; };
-
- s->state_out_len = 3;
- BZ_GET_SMALL(k1); BZ_RAND_UPD_MASK;
- k1 ^= BZ_RAND_MASK; s->nblock_used++;
- if (s->nblock_used == s->save_nblock+1) continue;
- if (k1 != s->k0) { s->k0 = k1; continue; };
-
- BZ_GET_SMALL(k1); BZ_RAND_UPD_MASK;
- k1 ^= BZ_RAND_MASK; s->nblock_used++;
- s->state_out_len = ((Int32)k1) + 4;
- BZ_GET_SMALL(s->k0); BZ_RAND_UPD_MASK;
- s->k0 ^= BZ_RAND_MASK; s->nblock_used++;
- }
-
- } else {
-
- while (True) {
- /* try to finish existing run */
- while (True) {
- if (s->strm->avail_out == 0) return;
- if (s->state_out_len == 0) break;
- *( (UChar*)(s->strm->next_out) ) = s->state_out_ch;
- BZ_UPDATE_CRC ( s->calculatedBlockCRC, s->state_out_ch );
- s->state_out_len--;
- s->strm->next_out++;
- s->strm->avail_out--;
- s->strm->total_out_lo32++;
- if (s->strm->total_out_lo32 == 0) s->strm->total_out_hi32++;
- }
-
- /* can a new run be started? */
- if (s->nblock_used == s->save_nblock+1) return;
-
- s->state_out_len = 1;
- s->state_out_ch = s->k0;
- BZ_GET_SMALL(k1); s->nblock_used++;
- if (s->nblock_used == s->save_nblock+1) continue;
- if (k1 != s->k0) { s->k0 = k1; continue; };
-
- s->state_out_len = 2;
- BZ_GET_SMALL(k1); s->nblock_used++;
- if (s->nblock_used == s->save_nblock+1) continue;
- if (k1 != s->k0) { s->k0 = k1; continue; };
-
- s->state_out_len = 3;
- BZ_GET_SMALL(k1); s->nblock_used++;
- if (s->nblock_used == s->save_nblock+1) continue;
- if (k1 != s->k0) { s->k0 = k1; continue; };
-
- BZ_GET_SMALL(k1); s->nblock_used++;
- s->state_out_len = ((Int32)k1) + 4;
- BZ_GET_SMALL(s->k0); s->nblock_used++;
- }
-
- }
-}
-
-
-/*---------------------------------------------------*/
-int BZ_API(BZ2_bzDecompress) ( bz_stream *strm )
-{
- DState* s;
- if (strm == NULL) return BZ_PARAM_ERROR;
- s = strm->state;
- if (s == NULL) return BZ_PARAM_ERROR;
- if (s->strm != strm) return BZ_PARAM_ERROR;
-
- while (True) {
- if (s->state == BZ_X_IDLE) return BZ_SEQUENCE_ERROR;
- if (s->state == BZ_X_OUTPUT) {
- if (s->smallDecompress)
- unRLE_obuf_to_output_SMALL ( s ); else
- unRLE_obuf_to_output_FAST ( s );
- if (s->nblock_used == s->save_nblock+1 && s->state_out_len == 0) {
- BZ_FINALISE_CRC ( s->calculatedBlockCRC );
- if (s->verbosity >= 3)
- VPrintf2 ( " {0x%x, 0x%x}", s->storedBlockCRC,
- s->calculatedBlockCRC );
- if (s->verbosity >= 2) VPrintf0 ( "]" );
- if (s->calculatedBlockCRC != s->storedBlockCRC)
- return BZ_DATA_ERROR;
- s->calculatedCombinedCRC
- = (s->calculatedCombinedCRC << 1) |
- (s->calculatedCombinedCRC >> 31);
- s->calculatedCombinedCRC ^= s->calculatedBlockCRC;
- s->state = BZ_X_BLKHDR_1;
- } else {
- return BZ_OK;
- }
- }
- if (s->state >= BZ_X_MAGIC_1) {
- Int32 r = BZ2_decompress ( s );
- if (r == BZ_STREAM_END) {
- if (s->verbosity >= 3)
- VPrintf2 ( "\n combined CRCs: stored = 0x%x, computed = 0x%x",
- s->storedCombinedCRC, s->calculatedCombinedCRC );
- if (s->calculatedCombinedCRC != s->storedCombinedCRC)
- return BZ_DATA_ERROR;
- return r;
- }
- if (s->state != BZ_X_OUTPUT) return r;
- }
- }
-
- AssertH ( 0, 6001 );
-
- return 0; /*NOTREACHED*/
-}
-
-
-/*---------------------------------------------------*/
-int BZ_API(BZ2_bzDecompressEnd) ( bz_stream *strm )
-{
- DState* s;
- if (strm == NULL) return BZ_PARAM_ERROR;
- s = strm->state;
- if (s == NULL) return BZ_PARAM_ERROR;
- if (s->strm != strm) return BZ_PARAM_ERROR;
-
- if (s->tt != NULL) BZFREE(s->tt);
- if (s->ll16 != NULL) BZFREE(s->ll16);
- if (s->ll4 != NULL) BZFREE(s->ll4);
-
- BZFREE(strm->state);
- strm->state = NULL;
-
- return BZ_OK;
-}
-
-
-#ifndef BZ_NO_STDIO
-/*---------------------------------------------------*/
-/*--- File I/O stuff ---*/
-/*---------------------------------------------------*/
-
-#define BZ_SETERR(eee) \
-{ \
- if (bzerror != NULL) *bzerror = eee; \
- if (bzf != NULL) bzf->lastErr = eee; \
-}
-
-typedef
- struct {
- FILE* handle;
- Char buf[BZ_MAX_UNUSED];
- Int32 bufN;
- Bool writing;
- bz_stream strm;
- Int32 lastErr;
- Bool initialisedOk;
- }
- bzFile;
-
-
-/*---------------------------------------------*/
-static Bool myfeof ( FILE* f )
-{
- Int32 c = fgetc ( f );
- if (c == EOF) return True;
- ungetc ( c, f );
- return False;
-}
-
-
-/*---------------------------------------------------*/
-BZFILE* BZ_API(BZ2_bzWriteOpen)
- ( int* bzerror,
- FILE* f,
- int blockSize100k,
- int verbosity,
- int workFactor )
-{
- Int32 ret;
- bzFile* bzf = NULL;
-
- BZ_SETERR(BZ_OK);
-
- if (f == NULL ||
- (blockSize100k < 1 || blockSize100k > 9) ||
- (workFactor < 0 || workFactor > 250) ||
- (verbosity < 0 || verbosity > 4))
- { BZ_SETERR(BZ_PARAM_ERROR); return NULL; };
-
- if (ferror(f))
- { BZ_SETERR(BZ_IO_ERROR); return NULL; };
-
- bzf = malloc ( sizeof(bzFile) );
- if (bzf == NULL)
- { BZ_SETERR(BZ_MEM_ERROR); return NULL; };
-
- BZ_SETERR(BZ_OK);
- bzf->initialisedOk = False;
- bzf->bufN = 0;
- bzf->handle = f;
- bzf->writing = True;
- bzf->strm.bzalloc = NULL;
- bzf->strm.bzfree = NULL;
- bzf->strm.opaque = NULL;
-
- if (workFactor == 0) workFactor = 30;
- ret = BZ2_bzCompressInit ( &(bzf->strm), blockSize100k,
- verbosity, workFactor );
- if (ret != BZ_OK)
- { BZ_SETERR(ret); free(bzf); return NULL; };
-
- bzf->strm.avail_in = 0;
- bzf->initialisedOk = True;
- return bzf;
-}
-
-
-
-/*---------------------------------------------------*/
-void BZ_API(BZ2_bzWrite)
- ( int* bzerror,
- BZFILE* b,
- void* buf,
- int len )
-{
- Int32 n, n2, ret;
- bzFile* bzf = (bzFile*)b;
-
- BZ_SETERR(BZ_OK);
- if (bzf == NULL || buf == NULL || len < 0)
- { BZ_SETERR(BZ_PARAM_ERROR); return; };
- if (!(bzf->writing))
- { BZ_SETERR(BZ_SEQUENCE_ERROR); return; };
- if (ferror(bzf->handle))
- { BZ_SETERR(BZ_IO_ERROR); return; };
-
- if (len == 0)
- { BZ_SETERR(BZ_OK); return; };
-
- bzf->strm.avail_in = len;
- bzf->strm.next_in = buf;
-
- while (True) {
- bzf->strm.avail_out = BZ_MAX_UNUSED;
- bzf->strm.next_out = bzf->buf;
- ret = BZ2_bzCompress ( &(bzf->strm), BZ_RUN );
- if (ret != BZ_RUN_OK)
- { BZ_SETERR(ret); return; };
-
- if (bzf->strm.avail_out < BZ_MAX_UNUSED) {
- n = BZ_MAX_UNUSED - bzf->strm.avail_out;
- n2 = fwrite ( (void*)(bzf->buf), sizeof(UChar),
- n, bzf->handle );
- if (n != n2 || ferror(bzf->handle))
- { BZ_SETERR(BZ_IO_ERROR); return; };
- }
-
- if (bzf->strm.avail_in == 0)
- { BZ_SETERR(BZ_OK); return; };
- }
-}
-
-
-/*---------------------------------------------------*/
-void BZ_API(BZ2_bzWriteClose)
- ( int* bzerror,
- BZFILE* b,
- int abandon,
- unsigned int* nbytes_in,
- unsigned int* nbytes_out )
-{
- BZ2_bzWriteClose64 ( bzerror, b, abandon,
- nbytes_in, NULL, nbytes_out, NULL );
-}
-
-
-void BZ_API(BZ2_bzWriteClose64)
- ( int* bzerror,
- BZFILE* b,
- int abandon,
- unsigned int* nbytes_in_lo32,
- unsigned int* nbytes_in_hi32,
- unsigned int* nbytes_out_lo32,
- unsigned int* nbytes_out_hi32 )
-{
- Int32 n, n2, ret;
- bzFile* bzf = (bzFile*)b;
-
- if (bzf == NULL)
- { BZ_SETERR(BZ_OK); return; };
- if (!(bzf->writing))
- { BZ_SETERR(BZ_SEQUENCE_ERROR); return; };
- if (ferror(bzf->handle))
- { BZ_SETERR(BZ_IO_ERROR); return; };
-
- if (nbytes_in_lo32 != NULL) *nbytes_in_lo32 = 0;
- if (nbytes_in_hi32 != NULL) *nbytes_in_hi32 = 0;
- if (nbytes_out_lo32 != NULL) *nbytes_out_lo32 = 0;
- if (nbytes_out_hi32 != NULL) *nbytes_out_hi32 = 0;
-
- if ((!abandon) && bzf->lastErr == BZ_OK) {
- while (True) {
- bzf->strm.avail_out = BZ_MAX_UNUSED;
- bzf->strm.next_out = bzf->buf;
- ret = BZ2_bzCompress ( &(bzf->strm), BZ_FINISH );
- if (ret != BZ_FINISH_OK && ret != BZ_STREAM_END)
- { BZ_SETERR(ret); return; };
-
- if (bzf->strm.avail_out < BZ_MAX_UNUSED) {
- n = BZ_MAX_UNUSED - bzf->strm.avail_out;
- n2 = fwrite ( (void*)(bzf->buf), sizeof(UChar),
- n, bzf->handle );
- if (n != n2 || ferror(bzf->handle))
- { BZ_SETERR(BZ_IO_ERROR); return; };
- }
-
- if (ret == BZ_STREAM_END) break;
- }
- }
-
- if ( !abandon && !ferror ( bzf->handle ) ) {
- fflush ( bzf->handle );
- if (ferror(bzf->handle))
- { BZ_SETERR(BZ_IO_ERROR); return; };
- }
-
- if (nbytes_in_lo32 != NULL)
- *nbytes_in_lo32 = bzf->strm.total_in_lo32;
- if (nbytes_in_hi32 != NULL)
- *nbytes_in_hi32 = bzf->strm.total_in_hi32;
- if (nbytes_out_lo32 != NULL)
- *nbytes_out_lo32 = bzf->strm.total_out_lo32;
- if (nbytes_out_hi32 != NULL)
- *nbytes_out_hi32 = bzf->strm.total_out_hi32;
-
- BZ_SETERR(BZ_OK);
- BZ2_bzCompressEnd ( &(bzf->strm) );
- free ( bzf );
-}
-
-
-/*---------------------------------------------------*/
-BZFILE* BZ_API(BZ2_bzReadOpen)
- ( int* bzerror,
- FILE* f,
- int verbosity,
- int small,
- void* unused,
- int nUnused )
-{
- bzFile* bzf = NULL;
- int ret;
-
- BZ_SETERR(BZ_OK);
-
- if (f == NULL ||
- (small != 0 && small != 1) ||
- (verbosity < 0 || verbosity > 4) ||
- (unused == NULL && nUnused != 0) ||
- (unused != NULL && (nUnused < 0 || nUnused > BZ_MAX_UNUSED)))
- { BZ_SETERR(BZ_PARAM_ERROR); return NULL; };
-
- if (ferror(f))
- { BZ_SETERR(BZ_IO_ERROR); return NULL; };
-
- bzf = malloc ( sizeof(bzFile) );
- if (bzf == NULL)
- { BZ_SETERR(BZ_MEM_ERROR); return NULL; };
-
- BZ_SETERR(BZ_OK);
-
- bzf->initialisedOk = False;
- bzf->handle = f;
- bzf->bufN = 0;
- bzf->writing = False;
- bzf->strm.bzalloc = NULL;
- bzf->strm.bzfree = NULL;
- bzf->strm.opaque = NULL;
-
- while (nUnused > 0) {
- bzf->buf[bzf->bufN] = *((UChar*)(unused)); bzf->bufN++;
- unused = ((void*)( 1 + ((UChar*)(unused)) ));
- nUnused--;
- }
-
- ret = BZ2_bzDecompressInit ( &(bzf->strm), verbosity, small );
- if (ret != BZ_OK)
- { BZ_SETERR(ret); free(bzf); return NULL; };
-
- bzf->strm.avail_in = bzf->bufN;
- bzf->strm.next_in = bzf->buf;
-
- bzf->initialisedOk = True;
- return bzf;
-}
-
-
-/*---------------------------------------------------*/
-void BZ_API(BZ2_bzReadClose) ( int *bzerror, BZFILE *b )
-{
- bzFile* bzf = (bzFile*)b;
-
- BZ_SETERR(BZ_OK);
- if (bzf == NULL)
- { BZ_SETERR(BZ_OK); return; };
-
- if (bzf->writing)
- { BZ_SETERR(BZ_SEQUENCE_ERROR); return; };
-
- if (bzf->initialisedOk)
- (void)BZ2_bzDecompressEnd ( &(bzf->strm) );
- free ( bzf );
-}
-
-
-/*---------------------------------------------------*/
-int BZ_API(BZ2_bzRead)
- ( int* bzerror,
- BZFILE* b,
- void* buf,
- int len )
-{
- Int32 n, ret;
- bzFile* bzf = (bzFile*)b;
-
- BZ_SETERR(BZ_OK);
-
- if (bzf == NULL || buf == NULL || len < 0)
- { BZ_SETERR(BZ_PARAM_ERROR); return 0; };
-
- if (bzf->writing)
- { BZ_SETERR(BZ_SEQUENCE_ERROR); return 0; };
-
- if (len == 0)
- { BZ_SETERR(BZ_OK); return 0; };
-
- bzf->strm.avail_out = len;
- bzf->strm.next_out = buf;
-
- while (True) {
-
- if (ferror(bzf->handle))
- { BZ_SETERR(BZ_IO_ERROR); return 0; };
-
- if (bzf->strm.avail_in == 0 && !myfeof(bzf->handle)) {
- n = fread ( bzf->buf, sizeof(UChar),
- BZ_MAX_UNUSED, bzf->handle );
- if (ferror(bzf->handle))
- { BZ_SETERR(BZ_IO_ERROR); return 0; };
- bzf->bufN = n;
- bzf->strm.avail_in = bzf->bufN;
- bzf->strm.next_in = bzf->buf;
- }
-
- ret = BZ2_bzDecompress ( &(bzf->strm) );
-
- if (ret != BZ_OK && ret != BZ_STREAM_END)
- { BZ_SETERR(ret); return 0; };
-
- if (ret == BZ_OK && myfeof(bzf->handle) &&
- bzf->strm.avail_in == 0 && bzf->strm.avail_out > 0)
- { BZ_SETERR(BZ_UNEXPECTED_EOF); return 0; };
-
- if (ret == BZ_STREAM_END)
- { BZ_SETERR(BZ_STREAM_END);
- return len - bzf->strm.avail_out; };
- if (bzf->strm.avail_out == 0)
- { BZ_SETERR(BZ_OK); return len; };
-
- }
-
- return 0; /*not reached*/
-}
-
-
-/*---------------------------------------------------*/
-void BZ_API(BZ2_bzReadGetUnused)
- ( int* bzerror,
- BZFILE* b,
- void** unused,
- int* nUnused )
-{
- bzFile* bzf = (bzFile*)b;
- if (bzf == NULL)
- { BZ_SETERR(BZ_PARAM_ERROR); return; };
- if (bzf->lastErr != BZ_STREAM_END)
- { BZ_SETERR(BZ_SEQUENCE_ERROR); return; };
- if (unused == NULL || nUnused == NULL)
- { BZ_SETERR(BZ_PARAM_ERROR); return; };
-
- BZ_SETERR(BZ_OK);
- *nUnused = bzf->strm.avail_in;
- *unused = bzf->strm.next_in;
-}
-#endif
-
-
-/*---------------------------------------------------*/
-/*--- Misc convenience stuff ---*/
-/*---------------------------------------------------*/
-
-/*---------------------------------------------------*/
-int BZ_API(BZ2_bzBuffToBuffCompress)
- ( char* dest,
- unsigned int* destLen,
- char* source,
- unsigned int sourceLen,
- int blockSize100k,
- int verbosity,
- int workFactor )
-{
- bz_stream strm;
- int ret;
-
- if (dest == NULL || destLen == NULL ||
- source == NULL ||
- blockSize100k < 1 || blockSize100k > 9 ||
- verbosity < 0 || verbosity > 4 ||
- workFactor < 0 || workFactor > 250)
- return BZ_PARAM_ERROR;
-
- if (workFactor == 0) workFactor = 30;
- strm.bzalloc = NULL;
- strm.bzfree = NULL;
- strm.opaque = NULL;
- ret = BZ2_bzCompressInit ( &strm, blockSize100k,
- verbosity, workFactor );
- if (ret != BZ_OK) return ret;
-
- strm.next_in = source;
- strm.next_out = dest;
- strm.avail_in = sourceLen;
- strm.avail_out = *destLen;
-
- ret = BZ2_bzCompress ( &strm, BZ_FINISH );
- if (ret == BZ_FINISH_OK) goto output_overflow;
- if (ret != BZ_STREAM_END) goto errhandler;
-
- /* normal termination */
- *destLen -= strm.avail_out;
- BZ2_bzCompressEnd ( &strm );
- return BZ_OK;
-
- output_overflow:
- BZ2_bzCompressEnd ( &strm );
- return BZ_OUTBUFF_FULL;
-
- errhandler:
- BZ2_bzCompressEnd ( &strm );
- return ret;
-}
-
-
-/*---------------------------------------------------*/
-int BZ_API(BZ2_bzBuffToBuffDecompress)
- ( char* dest,
- unsigned int* destLen,
- char* source,
- unsigned int sourceLen,
- int small,
- int verbosity )
-{
- bz_stream strm;
- int ret;
-
- if (dest == NULL || destLen == NULL ||
- source == NULL ||
- (small != 0 && small != 1) ||
- verbosity < 0 || verbosity > 4)
- return BZ_PARAM_ERROR;
-
- strm.bzalloc = NULL;
- strm.bzfree = NULL;
- strm.opaque = NULL;
- ret = BZ2_bzDecompressInit ( &strm, verbosity, small );
- if (ret != BZ_OK) return ret;
-
- strm.next_in = source;
- strm.next_out = dest;
- strm.avail_in = sourceLen;
- strm.avail_out = *destLen;
-
- ret = BZ2_bzDecompress ( &strm );
- if (ret == BZ_OK) goto output_overflow_or_eof;
- if (ret != BZ_STREAM_END) goto errhandler;
-
- /* normal termination */
- *destLen -= strm.avail_out;
- BZ2_bzDecompressEnd ( &strm );
- return BZ_OK;
-
- output_overflow_or_eof:
- if (strm.avail_out > 0) {
- BZ2_bzDecompressEnd ( &strm );
- return BZ_UNEXPECTED_EOF;
- } else {
- BZ2_bzDecompressEnd ( &strm );
- return BZ_OUTBUFF_FULL;
- };
-
- errhandler:
- BZ2_bzDecompressEnd ( &strm );
- return ret;
-}
-
-
-/*---------------------------------------------------*/
-/*--
- Code contributed by Yoshioka Tsuneo
- (QWF00133@niftyserve.or.jp/tsuneo-y@is.aist-nara.ac.jp),
- to support better zlib compatibility.
- This code is not _officially_ part of libbzip2 (yet);
- I haven't tested it, documented it, or considered the
- threading-safeness of it.
- If this code breaks, please contact both Yoshioka and me.
---*/
-/*---------------------------------------------------*/
-
-/*---------------------------------------------------*/
-/*--
- return version like "0.9.0c".
---*/
-const char * BZ_API(BZ2_bzlibVersion)(void)
-{
- return BZ_VERSION;
-}
-
-
-#ifndef BZ_NO_STDIO
-/*---------------------------------------------------*/
-
-#if defined(_WIN32) || defined(OS2) || defined(MSDOS)
-# include <fcntl.h>
-# include <io.h>
-# define SET_BINARY_MODE(file) setmode(fileno(file),O_BINARY)
-#else
-# define SET_BINARY_MODE(file)
-#endif
-static
-BZFILE * bzopen_or_bzdopen
- ( const char *path, /* no use when bzdopen */
- int fd, /* no use when bzdopen */
- const char *mode,
- int open_mode) /* bzopen: 0, bzdopen:1 */
-{
- int bzerr;
- char unused[BZ_MAX_UNUSED];
- int blockSize100k = 9;
- int writing = 0;
- char mode2[10] = "";
- FILE *fp = NULL;
- BZFILE *bzfp = NULL;
- int verbosity = 0;
- int workFactor = 30;
- int smallMode = 0;
- int nUnused = 0;
-
- if (mode == NULL) return NULL;
- while (*mode) {
- switch (*mode) {
- case 'r':
- writing = 0; break;
- case 'w':
- writing = 1; break;
- case 's':
- smallMode = 1; break;
- default:
- if (isdigit((int)(*mode))) {
- blockSize100k = *mode-'0';
- }
- }
- mode++;
- }
- strcat(mode2, writing ? "w" : "r" );
- strcat(mode2,"b"); /* binary mode */
-
- if (open_mode==0) {
- if (path==NULL || strcmp(path,"")==0) {
- fp = (writing ? stdout : stdin);
- SET_BINARY_MODE(fp);
- } else {
- fp = fopen(path,mode2);
- }
- } else {
-#ifdef BZ_STRICT_ANSI
- fp = NULL;
-#else
- fp = fdopen(fd,mode2);
-#endif
- }
- if (fp == NULL) return NULL;
-
- if (writing) {
- /* Guard against total chaos and anarchy -- JRS */
- if (blockSize100k < 1) blockSize100k = 1;
- if (blockSize100k > 9) blockSize100k = 9;
- bzfp = BZ2_bzWriteOpen(&bzerr,fp,blockSize100k,
- verbosity,workFactor);
- } else {
- bzfp = BZ2_bzReadOpen(&bzerr,fp,verbosity,smallMode,
- unused,nUnused);
- }
- if (bzfp == NULL) {
- if (fp != stdin && fp != stdout) fclose(fp);
- return NULL;
- }
- return bzfp;
-}
-
-
-/*---------------------------------------------------*/
-/*--
- open file for read or write.
- ex) bzopen("file","w9")
- case path="" or NULL => use stdin or stdout.
---*/
-BZFILE * BZ_API(BZ2_bzopen)
- ( const char *path,
- const char *mode )
-{
- return bzopen_or_bzdopen(path,-1,mode,/*bzopen*/0);
-}
-
-
-/*---------------------------------------------------*/
-BZFILE * BZ_API(BZ2_bzdopen)
- ( int fd,
- const char *mode )
-{
- return bzopen_or_bzdopen(NULL,fd,mode,/*bzdopen*/1);
-}
-
-
-/*---------------------------------------------------*/
-int BZ_API(BZ2_bzread) (BZFILE* b, void* buf, int len )
-{
- int bzerr, nread;
- if (((bzFile*)b)->lastErr == BZ_STREAM_END) return 0;
- nread = BZ2_bzRead(&bzerr,b,buf,len);
- if (bzerr == BZ_OK || bzerr == BZ_STREAM_END) {
- return nread;
- } else {
- return -1;
- }
-}
-
-
-/*---------------------------------------------------*/
-int BZ_API(BZ2_bzwrite) (BZFILE* b, void* buf, int len )
-{
- int bzerr;
-
- BZ2_bzWrite(&bzerr,b,buf,len);
- if(bzerr == BZ_OK){
- return len;
- }else{
- return -1;
- }
-}
-
-
-/*---------------------------------------------------*/
-int BZ_API(BZ2_bzflush) (BZFILE *b)
-{
- /* do nothing now... */
- return 0;
-}
-
-
-/*---------------------------------------------------*/
-void BZ_API(BZ2_bzclose) (BZFILE* b)
-{
- int bzerr;
- FILE *fp = ((bzFile *)b)->handle;
-
- if (b==NULL) {return;}
- if(((bzFile*)b)->writing){
- BZ2_bzWriteClose(&bzerr,b,0,NULL,NULL);
- if(bzerr != BZ_OK){
- BZ2_bzWriteClose(NULL,b,1,NULL,NULL);
- }
- }else{
- BZ2_bzReadClose(&bzerr,b);
- }
- if(fp!=stdin && fp!=stdout){
- fclose(fp);
- }
-}
-
-
-/*---------------------------------------------------*/
-/*--
- return last error code
---*/
-static char *bzerrorstrings[] = {
- "OK"
- ,"SEQUENCE_ERROR"
- ,"PARAM_ERROR"
- ,"MEM_ERROR"
- ,"DATA_ERROR"
- ,"DATA_ERROR_MAGIC"
- ,"IO_ERROR"
- ,"UNEXPECTED_EOF"
- ,"OUTBUFF_FULL"
- ,"CONFIG_ERROR"
- ,"???" /* for future */
- ,"???" /* for future */
- ,"???" /* for future */
- ,"???" /* for future */
- ,"???" /* for future */
- ,"???" /* for future */
-};
-
-
-const char * BZ_API(BZ2_bzerror) (BZFILE *b, int *errnum)
-{
- int err = ((bzFile *)b)->lastErr;
-
- if(err>0) err = 0;
- *errnum = err;
- return bzerrorstrings[err*-1];
-}
-#endif
-
-
-/*-------------------------------------------------------------*/
-/*--- end bzlib.c ---*/
-/*-------------------------------------------------------------*/
+++ /dev/null
-
-/*-------------------------------------------------------------*/
-/*--- Public header file for the library. ---*/
-/*--- bzlib.h ---*/
-/*-------------------------------------------------------------*/
-
-/*--
- This file is a part of bzip2 and/or libbzip2, a program and
- library for lossless, block-sorting data compression.
-
- Copyright (C) 1996-2000 Julian R Seward. All rights reserved.
-
- Redistribution and use in source and binary forms, with or without
- modification, are permitted provided that the following conditions
- are met:
-
- 1. Redistributions of source code must retain the above copyright
- notice, this list of conditions and the following disclaimer.
-
- 2. The origin of this software must not be misrepresented; you must
- not claim that you wrote the original software. If you use this
- software in a product, an acknowledgment in the product
- documentation would be appreciated but is not required.
-
- 3. Altered source versions must be plainly marked as such, and must
- not be misrepresented as being the original software.
-
- 4. The name of the author may not be used to endorse or promote
- products derived from this software without specific prior written
- permission.
-
- THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
- OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
- DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
- GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
- Julian Seward, Cambridge, UK.
- jseward@acm.org
- bzip2/libbzip2 version 1.0 of 21 March 2000
-
- This program is based on (at least) the work of:
- Mike Burrows
- David Wheeler
- Peter Fenwick
- Alistair Moffat
- Radford Neal
- Ian H. Witten
- Robert Sedgewick
- Jon L. Bentley
-
- For more information on these sources, see the manual.
---*/
-
-
-#ifndef _BZLIB_H
-#define _BZLIB_H
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-#define BZ_RUN 0
-#define BZ_FLUSH 1
-#define BZ_FINISH 2
-
-#define BZ_OK 0
-#define BZ_RUN_OK 1
-#define BZ_FLUSH_OK 2
-#define BZ_FINISH_OK 3
-#define BZ_STREAM_END 4
-#define BZ_SEQUENCE_ERROR (-1)
-#define BZ_PARAM_ERROR (-2)
-#define BZ_MEM_ERROR (-3)
-#define BZ_DATA_ERROR (-4)
-#define BZ_DATA_ERROR_MAGIC (-5)
-#define BZ_IO_ERROR (-6)
-#define BZ_UNEXPECTED_EOF (-7)
-#define BZ_OUTBUFF_FULL (-8)
-#define BZ_CONFIG_ERROR (-9)
-
-typedef
- struct {
- char *next_in;
- unsigned int avail_in;
- unsigned int total_in_lo32;
- unsigned int total_in_hi32;
-
- char *next_out;
- unsigned int avail_out;
- unsigned int total_out_lo32;
- unsigned int total_out_hi32;
-
- void *state;
-
- void *(*bzalloc)(void *,int,int);
- void (*bzfree)(void *,void *);
- void *opaque;
- }
- bz_stream;
-
-
-#ifndef BZ_IMPORT
-#define BZ_EXPORT
-#endif
-
-#ifdef _WIN32
-# include <stdio.h>
-# include <windows.h>
-# ifdef small
- /* windows.h define small to char */
-# undef small
-# endif
-# ifdef BZ_EXPORT
-# define BZ_API(func) WINAPI func
-# define BZ_EXTERN extern
-# else
- /* import windows dll dynamically */
-# define BZ_API(func) (WINAPI * func)
-# define BZ_EXTERN
-# endif
-#else
-# define BZ_API(func) func
-# define BZ_EXTERN extern
-#endif
-
-
-/*-- Core (low-level) library functions --*/
-
-BZ_EXTERN int BZ_API(BZ2_bzCompressInit) (
- bz_stream* strm,
- int blockSize100k,
- int verbosity,
- int workFactor
- );
-
-BZ_EXTERN int BZ_API(BZ2_bzCompress) (
- bz_stream* strm,
- int action
- );
-
-BZ_EXTERN int BZ_API(BZ2_bzCompressEnd) (
- bz_stream* strm
- );
-
-BZ_EXTERN int BZ_API(BZ2_bzDecompressInit) (
- bz_stream *strm,
- int verbosity,
- int small
- );
-
-BZ_EXTERN int BZ_API(BZ2_bzDecompress) (
- bz_stream* strm
- );
-
-BZ_EXTERN int BZ_API(BZ2_bzDecompressEnd) (
- bz_stream *strm
- );
-
-
-
-/*-- High(er) level library functions --*/
-
-#ifndef BZ_NO_STDIO
-#define BZ_MAX_UNUSED 5000
-
-typedef void BZFILE;
-
-BZ_EXTERN BZFILE* BZ_API(BZ2_bzReadOpen) (
- int* bzerror,
- FILE* f,
- int verbosity,
- int small,
- void* unused,
- int nUnused
- );
-
-BZ_EXTERN void BZ_API(BZ2_bzReadClose) (
- int* bzerror,
- BZFILE* b
- );
-
-BZ_EXTERN void BZ_API(BZ2_bzReadGetUnused) (
- int* bzerror,
- BZFILE* b,
- void** unused,
- int* nUnused
- );
-
-BZ_EXTERN int BZ_API(BZ2_bzRead) (
- int* bzerror,
- BZFILE* b,
- void* buf,
- int len
- );
-
-BZ_EXTERN BZFILE* BZ_API(BZ2_bzWriteOpen) (
- int* bzerror,
- FILE* f,
- int blockSize100k,
- int verbosity,
- int workFactor
- );
-
-BZ_EXTERN void BZ_API(BZ2_bzWrite) (
- int* bzerror,
- BZFILE* b,
- void* buf,
- int len
- );
-
-BZ_EXTERN void BZ_API(BZ2_bzWriteClose) (
- int* bzerror,
- BZFILE* b,
- int abandon,
- unsigned int* nbytes_in,
- unsigned int* nbytes_out
- );
-
-BZ_EXTERN void BZ_API(BZ2_bzWriteClose64) (
- int* bzerror,
- BZFILE* b,
- int abandon,
- unsigned int* nbytes_in_lo32,
- unsigned int* nbytes_in_hi32,
- unsigned int* nbytes_out_lo32,
- unsigned int* nbytes_out_hi32
- );
-#endif
-
-
-/*-- Utility functions --*/
-
-BZ_EXTERN int BZ_API(BZ2_bzBuffToBuffCompress) (
- char* dest,
- unsigned int* destLen,
- char* source,
- unsigned int sourceLen,
- int blockSize100k,
- int verbosity,
- int workFactor
- );
-
-BZ_EXTERN int BZ_API(BZ2_bzBuffToBuffDecompress) (
- char* dest,
- unsigned int* destLen,
- char* source,
- unsigned int sourceLen,
- int small,
- int verbosity
- );
-
-
-/*--
- Code contributed by Yoshioka Tsuneo
- (QWF00133@niftyserve.or.jp/tsuneo-y@is.aist-nara.ac.jp),
- to support better zlib compatibility.
- This code is not _officially_ part of libbzip2 (yet);
- I haven't tested it, documented it, or considered the
- threading-safeness of it.
- If this code breaks, please contact both Yoshioka and me.
---*/
-
-BZ_EXTERN const char * BZ_API(BZ2_bzlibVersion) (
- void
- );
-
-#ifndef BZ_NO_STDIO
-BZ_EXTERN BZFILE * BZ_API(BZ2_bzopen) (
- const char *path,
- const char *mode
- );
-
-BZ_EXTERN BZFILE * BZ_API(BZ2_bzdopen) (
- int fd,
- const char *mode
- );
-
-BZ_EXTERN int BZ_API(BZ2_bzread) (
- BZFILE* b,
- void* buf,
- int len
- );
-
-BZ_EXTERN int BZ_API(BZ2_bzwrite) (
- BZFILE* b,
- void* buf,
- int len
- );
-
-BZ_EXTERN int BZ_API(BZ2_bzflush) (
- BZFILE* b
- );
-
-BZ_EXTERN void BZ_API(BZ2_bzclose) (
- BZFILE* b
- );
-
-BZ_EXTERN const char * BZ_API(BZ2_bzerror) (
- BZFILE *b,
- int *errnum
- );
-#endif
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif
-
-/*-------------------------------------------------------------*/
-/*--- end bzlib.h ---*/
-/*-------------------------------------------------------------*/
+++ /dev/null
-
-/*-------------------------------------------------------------*/
-/*--- Private header file for the library. ---*/
-/*--- bzlib_private.h ---*/
-/*-------------------------------------------------------------*/
-
-/*--
- This file is a part of bzip2 and/or libbzip2, a program and
- library for lossless, block-sorting data compression.
-
- Copyright (C) 1996-2000 Julian R Seward. All rights reserved.
-
- Redistribution and use in source and binary forms, with or without
- modification, are permitted provided that the following conditions
- are met:
-
- 1. Redistributions of source code must retain the above copyright
- notice, this list of conditions and the following disclaimer.
-
- 2. The origin of this software must not be misrepresented; you must
- not claim that you wrote the original software. If you use this
- software in a product, an acknowledgment in the product
- documentation would be appreciated but is not required.
-
- 3. Altered source versions must be plainly marked as such, and must
- not be misrepresented as being the original software.
-
- 4. The name of the author may not be used to endorse or promote
- products derived from this software without specific prior written
- permission.
-
- THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
- OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
- DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
- GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
- Julian Seward, Cambridge, UK.
- jseward@acm.org
- bzip2/libbzip2 version 1.0 of 21 March 2000
-
- This program is based on (at least) the work of:
- Mike Burrows
- David Wheeler
- Peter Fenwick
- Alistair Moffat
- Radford Neal
- Ian H. Witten
- Robert Sedgewick
- Jon L. Bentley
-
- For more information on these sources, see the manual.
---*/
-
-
-#ifndef _BZLIB_PRIVATE_H
-#define _BZLIB_PRIVATE_H
-
-#include <stdlib.h>
-
-#ifndef BZ_NO_STDIO
-#include <stdio.h>
-#include <ctype.h>
-#include <string.h>
-#endif
-
-#include "bzlib.h"
-
-
-
-/*-- General stuff. --*/
-
-#define BZ_VERSION "1.0.1, 23-June-2000"
-
-typedef char Char;
-typedef unsigned char Bool;
-typedef unsigned char UChar;
-typedef int Int32;
-typedef unsigned int UInt32;
-typedef short Int16;
-typedef unsigned short UInt16;
-
-#define True ((Bool)1)
-#define False ((Bool)0)
-
-#ifndef __GNUC__
-#define __inline__ /* */
-#endif
-
-#ifndef BZ_NO_STDIO
-extern void BZ2_bz__AssertH__fail ( int errcode );
-#define AssertH(cond,errcode) \
- { if (!(cond)) BZ2_bz__AssertH__fail ( errcode ); }
-#if BZ_DEBUG
-#define AssertD(cond,msg) \
- { if (!(cond)) { \
- fprintf ( stderr, \
- "\n\nlibbzip2(debug build): internal error\n\t%s\n", msg );\
- exit(1); \
- }}
-#else
-#define AssertD(cond,msg) /* */
-#endif
-#define VPrintf0(zf) \
- fprintf(stderr,zf)
-#define VPrintf1(zf,za1) \
- fprintf(stderr,zf,za1)
-#define VPrintf2(zf,za1,za2) \
- fprintf(stderr,zf,za1,za2)
-#define VPrintf3(zf,za1,za2,za3) \
- fprintf(stderr,zf,za1,za2,za3)
-#define VPrintf4(zf,za1,za2,za3,za4) \
- fprintf(stderr,zf,za1,za2,za3,za4)
-#define VPrintf5(zf,za1,za2,za3,za4,za5) \
- fprintf(stderr,zf,za1,za2,za3,za4,za5)
-#else
-extern void bz_internal_error ( int errcode );
-#define AssertH(cond,errcode) \
- { if (!(cond)) bz_internal_error ( errcode ); }
-#define AssertD(cond,msg) /* */
-#define VPrintf0(zf) /* */
-#define VPrintf1(zf,za1) /* */
-#define VPrintf2(zf,za1,za2) /* */
-#define VPrintf3(zf,za1,za2,za3) /* */
-#define VPrintf4(zf,za1,za2,za3,za4) /* */
-#define VPrintf5(zf,za1,za2,za3,za4,za5) /* */
-#endif
-
-
-#define BZALLOC(nnn) (strm->bzalloc)(strm->opaque,(nnn),1)
-#define BZFREE(ppp) (strm->bzfree)(strm->opaque,(ppp))
-
-
-/*-- Constants for the back end. --*/
-
-#define BZ_MAX_ALPHA_SIZE 258
-#define BZ_MAX_CODE_LEN 23
-
-#define BZ_RUNA 0
-#define BZ_RUNB 1
-
-#define BZ_N_GROUPS 6
-#define BZ_G_SIZE 50
-#define BZ_N_ITERS 4
-
-#define BZ_MAX_SELECTORS (2 + (900000 / BZ_G_SIZE))
-
-
-
-/*-- Stuff for randomising repetitive blocks. --*/
-
-extern Int32 BZ2_rNums[512];
-
-#define BZ_RAND_DECLS \
- Int32 rNToGo; \
- Int32 rTPos \
-
-#define BZ_RAND_INIT_MASK \
- s->rNToGo = 0; \
- s->rTPos = 0 \
-
-#define BZ_RAND_MASK ((s->rNToGo == 1) ? 1 : 0)
-
-#define BZ_RAND_UPD_MASK \
- if (s->rNToGo == 0) { \
- s->rNToGo = BZ2_rNums[s->rTPos]; \
- s->rTPos++; \
- if (s->rTPos == 512) s->rTPos = 0; \
- } \
- s->rNToGo--;
-
-
-
-/*-- Stuff for doing CRCs. --*/
-
-extern UInt32 BZ2_crc32Table[256];
-
-#define BZ_INITIALISE_CRC(crcVar) \
-{ \
- crcVar = 0xffffffffL; \
-}
-
-#define BZ_FINALISE_CRC(crcVar) \
-{ \
- crcVar = ~(crcVar); \
-}
-
-#define BZ_UPDATE_CRC(crcVar,cha) \
-{ \
- crcVar = (crcVar << 8) ^ \
- BZ2_crc32Table[(crcVar >> 24) ^ \
- ((UChar)cha)]; \
-}
-
-
-
-/*-- States and modes for compression. --*/
-
-#define BZ_M_IDLE 1
-#define BZ_M_RUNNING 2
-#define BZ_M_FLUSHING 3
-#define BZ_M_FINISHING 4
-
-#define BZ_S_OUTPUT 1
-#define BZ_S_INPUT 2
-
-#define BZ_N_RADIX 2
-#define BZ_N_QSORT 12
-#define BZ_N_SHELL 18
-#define BZ_N_OVERSHOOT (BZ_N_RADIX + BZ_N_QSORT + BZ_N_SHELL + 2)
-
-
-
-
-/*-- Structure holding all the compression-side stuff. --*/
-
-typedef
- struct {
- /* pointer back to the struct bz_stream */
- bz_stream* strm;
-
- /* mode this stream is in, and whether inputting */
- /* or outputting data */
- Int32 mode;
- Int32 state;
-
- /* remembers avail_in when flush/finish requested */
- UInt32 avail_in_expect;
-
- /* for doing the block sorting */
- UInt32* arr1;
- UInt32* arr2;
- UInt32* ftab;
- Int32 origPtr;
-
- /* aliases for arr1 and arr2 */
- UInt32* ptr;
- UChar* block;
- UInt16* mtfv;
- UChar* zbits;
-
- /* for deciding when to use the fallback sorting algorithm */
- Int32 workFactor;
-
- /* run-length-encoding of the input */
- UInt32 state_in_ch;
- Int32 state_in_len;
- BZ_RAND_DECLS;
-
- /* input and output limits and current posns */
- Int32 nblock;
- Int32 nblockMAX;
- Int32 numZ;
- Int32 state_out_pos;
-
- /* map of bytes used in block */
- Int32 nInUse;
- Bool inUse[256];
- UChar unseqToSeq[256];
-
- /* the buffer for bit stream creation */
- UInt32 bsBuff;
- Int32 bsLive;
-
- /* block and combined CRCs */
- UInt32 blockCRC;
- UInt32 combinedCRC;
-
- /* misc administratium */
- Int32 verbosity;
- Int32 blockNo;
- Int32 blockSize100k;
-
- /* stuff for coding the MTF values */
- Int32 nMTF;
- Int32 mtfFreq [BZ_MAX_ALPHA_SIZE];
- UChar selector [BZ_MAX_SELECTORS];
- UChar selectorMtf[BZ_MAX_SELECTORS];
-
- UChar len [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
- Int32 code [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
- Int32 rfreq [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
- /* second dimension: only 3 needed; 4 makes index calculations faster */
- UInt32 len_pack[BZ_MAX_ALPHA_SIZE][4];
-
- }
- EState;
-
-
-
-/*-- externs for compression. --*/
-
-extern void
-BZ2_blockSort ( EState* );
-
-extern void
-BZ2_compressBlock ( EState*, Bool );
-
-extern void
-BZ2_bsInitWrite ( EState* );
-
-extern void
-BZ2_hbAssignCodes ( Int32*, UChar*, Int32, Int32, Int32 );
-
-extern void
-BZ2_hbMakeCodeLengths ( UChar*, Int32*, Int32, Int32 );
-
-
-
-/*-- states for decompression. --*/
-
-#define BZ_X_IDLE 1
-#define BZ_X_OUTPUT 2
-
-#define BZ_X_MAGIC_1 10
-#define BZ_X_MAGIC_2 11
-#define BZ_X_MAGIC_3 12
-#define BZ_X_MAGIC_4 13
-#define BZ_X_BLKHDR_1 14
-#define BZ_X_BLKHDR_2 15
-#define BZ_X_BLKHDR_3 16
-#define BZ_X_BLKHDR_4 17
-#define BZ_X_BLKHDR_5 18
-#define BZ_X_BLKHDR_6 19
-#define BZ_X_BCRC_1 20
-#define BZ_X_BCRC_2 21
-#define BZ_X_BCRC_3 22
-#define BZ_X_BCRC_4 23
-#define BZ_X_RANDBIT 24
-#define BZ_X_ORIGPTR_1 25
-#define BZ_X_ORIGPTR_2 26
-#define BZ_X_ORIGPTR_3 27
-#define BZ_X_MAPPING_1 28
-#define BZ_X_MAPPING_2 29
-#define BZ_X_SELECTOR_1 30
-#define BZ_X_SELECTOR_2 31
-#define BZ_X_SELECTOR_3 32
-#define BZ_X_CODING_1 33
-#define BZ_X_CODING_2 34
-#define BZ_X_CODING_3 35
-#define BZ_X_MTF_1 36
-#define BZ_X_MTF_2 37
-#define BZ_X_MTF_3 38
-#define BZ_X_MTF_4 39
-#define BZ_X_MTF_5 40
-#define BZ_X_MTF_6 41
-#define BZ_X_ENDHDR_2 42
-#define BZ_X_ENDHDR_3 43
-#define BZ_X_ENDHDR_4 44
-#define BZ_X_ENDHDR_5 45
-#define BZ_X_ENDHDR_6 46
-#define BZ_X_CCRC_1 47
-#define BZ_X_CCRC_2 48
-#define BZ_X_CCRC_3 49
-#define BZ_X_CCRC_4 50
-
-
-
-/*-- Constants for the fast MTF decoder. --*/
-
-#define MTFA_SIZE 4096
-#define MTFL_SIZE 16
-
-
-
-/*-- Structure holding all the decompression-side stuff. --*/
-
-typedef
- struct {
- /* pointer back to the struct bz_stream */
- bz_stream* strm;
-
- /* state indicator for this stream */
- Int32 state;
-
- /* for doing the final run-length decoding */
- UChar state_out_ch;
- Int32 state_out_len;
- Bool blockRandomised;
- BZ_RAND_DECLS;
-
- /* the buffer for bit stream reading */
- UInt32 bsBuff;
- Int32 bsLive;
-
- /* misc administratium */
- Int32 blockSize100k;
- Bool smallDecompress;
- Int32 currBlockNo;
- Int32 verbosity;
-
- /* for undoing the Burrows-Wheeler transform */
- Int32 origPtr;
- UInt32 tPos;
- Int32 k0;
- Int32 unzftab[256];
- Int32 nblock_used;
- Int32 cftab[257];
- Int32 cftabCopy[257];
-
- /* for undoing the Burrows-Wheeler transform (FAST) */
- UInt32 *tt;
-
- /* for undoing the Burrows-Wheeler transform (SMALL) */
- UInt16 *ll16;
- UChar *ll4;
-
- /* stored and calculated CRCs */
- UInt32 storedBlockCRC;
- UInt32 storedCombinedCRC;
- UInt32 calculatedBlockCRC;
- UInt32 calculatedCombinedCRC;
-
- /* map of bytes used in block */
- Int32 nInUse;
- Bool inUse[256];
- Bool inUse16[16];
- UChar seqToUnseq[256];
-
- /* for decoding the MTF values */
- UChar mtfa [MTFA_SIZE];
- Int32 mtfbase[256 / MTFL_SIZE];
- UChar selector [BZ_MAX_SELECTORS];
- UChar selectorMtf[BZ_MAX_SELECTORS];
- UChar len [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
-
- Int32 limit [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
- Int32 base [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
- Int32 perm [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
- Int32 minLens[BZ_N_GROUPS];
-
- /* save area for scalars in the main decompress code */
- Int32 save_i;
- Int32 save_j;
- Int32 save_t;
- Int32 save_alphaSize;
- Int32 save_nGroups;
- Int32 save_nSelectors;
- Int32 save_EOB;
- Int32 save_groupNo;
- Int32 save_groupPos;
- Int32 save_nextSym;
- Int32 save_nblockMAX;
- Int32 save_nblock;
- Int32 save_es;
- Int32 save_N;
- Int32 save_curr;
- Int32 save_zt;
- Int32 save_zn;
- Int32 save_zvec;
- Int32 save_zj;
- Int32 save_gSel;
- Int32 save_gMinlen;
- Int32* save_gLimit;
- Int32* save_gBase;
- Int32* save_gPerm;
-
- }
- DState;
-
-
-
-/*-- Macros for decompression. --*/
-
-#define BZ_GET_FAST(cccc) \
- s->tPos = s->tt[s->tPos]; \
- cccc = (UChar)(s->tPos & 0xff); \
- s->tPos >>= 8;
-
-#define BZ_GET_FAST_C(cccc) \
- c_tPos = c_tt[c_tPos]; \
- cccc = (UChar)(c_tPos & 0xff); \
- c_tPos >>= 8;
-
-#define SET_LL4(i,n) \
- { if (((i) & 0x1) == 0) \
- s->ll4[(i) >> 1] = (s->ll4[(i) >> 1] & 0xf0) | (n); else \
- s->ll4[(i) >> 1] = (s->ll4[(i) >> 1] & 0x0f) | ((n) << 4); \
- }
-
-#define GET_LL4(i) \
- ((((UInt32)(s->ll4[(i) >> 1])) >> (((i) << 2) & 0x4)) & 0xF)
-
-#define SET_LL(i,n) \
- { s->ll16[i] = (UInt16)(n & 0x0000ffff); \
- SET_LL4(i, n >> 16); \
- }
-
-#define GET_LL(i) \
- (((UInt32)s->ll16[i]) | (GET_LL4(i) << 16))
-
-#define BZ_GET_SMALL(cccc) \
- cccc = BZ2_indexIntoF ( s->tPos, s->cftab ); \
- s->tPos = GET_LL(s->tPos);
-
-
-/*-- externs for decompression. --*/
-
-extern Int32
-BZ2_indexIntoF ( Int32, Int32* );
-
-extern Int32
-BZ2_decompress ( DState* );
-
-extern void
-BZ2_hbCreateDecodeTables ( Int32*, Int32*, Int32*, UChar*,
- Int32, Int32, Int32 );
-
-
-#endif
-
-
-/*-- BZ_NO_STDIO seems to make NULL disappear on some platforms. --*/
-
-#ifdef BZ_NO_STDIO
-#ifndef NULL
-#define NULL 0
-#endif
-#endif
-
-
-/*-------------------------------------------------------------*/
-/*--- end bzlib_private.h ---*/
-/*-------------------------------------------------------------*/
+++ /dev/null
-
-/*-------------------------------------------------------------*/
-/*--- Compression machinery (not incl block sorting) ---*/
-/*--- compress.c ---*/
-/*-------------------------------------------------------------*/
-
-/*--
- This file is a part of bzip2 and/or libbzip2, a program and
- library for lossless, block-sorting data compression.
-
- Copyright (C) 1996-2000 Julian R Seward. All rights reserved.
-
- Redistribution and use in source and binary forms, with or without
- modification, are permitted provided that the following conditions
- are met:
-
- 1. Redistributions of source code must retain the above copyright
- notice, this list of conditions and the following disclaimer.
-
- 2. The origin of this software must not be misrepresented; you must
- not claim that you wrote the original software. If you use this
- software in a product, an acknowledgment in the product
- documentation would be appreciated but is not required.
-
- 3. Altered source versions must be plainly marked as such, and must
- not be misrepresented as being the original software.
-
- 4. The name of the author may not be used to endorse or promote
- products derived from this software without specific prior written
- permission.
-
- THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
- OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
- DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
- GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
- Julian Seward, Cambridge, UK.
- jseward@acm.org
- bzip2/libbzip2 version 1.0 of 21 March 2000
-
- This program is based on (at least) the work of:
- Mike Burrows
- David Wheeler
- Peter Fenwick
- Alistair Moffat
- Radford Neal
- Ian H. Witten
- Robert Sedgewick
- Jon L. Bentley
-
- For more information on these sources, see the manual.
---*/
-
-/*--
- CHANGES
- ~~~~~~~
- 0.9.0 -- original version.
-
- 0.9.0a/b -- no changes in this file.
-
- 0.9.0c
- * changed setting of nGroups in sendMTFValues() so as to
- do a bit better on small files
---*/
-
-#include "bzlib_private.h"
-
-
-/*---------------------------------------------------*/
-/*--- Bit stream I/O ---*/
-/*---------------------------------------------------*/
-
-/*---------------------------------------------------*/
-void BZ2_bsInitWrite ( EState* s )
-{
- s->bsLive = 0;
- s->bsBuff = 0;
-}
-
-
-/*---------------------------------------------------*/
-static
-void bsFinishWrite ( EState* s )
-{
- while (s->bsLive > 0) {
- s->zbits[s->numZ] = (UChar)(s->bsBuff >> 24);
- s->numZ++;
- s->bsBuff <<= 8;
- s->bsLive -= 8;
- }
-}
-
-
-/*---------------------------------------------------*/
-#define bsNEEDW(nz) \
-{ \
- while (s->bsLive >= 8) { \
- s->zbits[s->numZ] \
- = (UChar)(s->bsBuff >> 24); \
- s->numZ++; \
- s->bsBuff <<= 8; \
- s->bsLive -= 8; \
- } \
-}
-
-
-/*---------------------------------------------------*/
-static
-__inline__
-void bsW ( EState* s, Int32 n, UInt32 v )
-{
- bsNEEDW ( n );
- s->bsBuff |= (v << (32 - s->bsLive - n));
- s->bsLive += n;
-}
-
-
-/*---------------------------------------------------*/
-static
-void bsPutUInt32 ( EState* s, UInt32 u )
-{
- bsW ( s, 8, (u >> 24) & 0xffL );
- bsW ( s, 8, (u >> 16) & 0xffL );
- bsW ( s, 8, (u >> 8) & 0xffL );
- bsW ( s, 8, u & 0xffL );
-}
-
-
-/*---------------------------------------------------*/
-static
-void bsPutUChar ( EState* s, UChar c )
-{
- bsW( s, 8, (UInt32)c );
-}
-
-
-/*---------------------------------------------------*/
-/*--- The back end proper ---*/
-/*---------------------------------------------------*/
-
-/*---------------------------------------------------*/
-static
-void makeMaps_e ( EState* s )
-{
- Int32 i;
- s->nInUse = 0;
- for (i = 0; i < 256; i++)
- if (s->inUse[i]) {
- s->unseqToSeq[i] = s->nInUse;
- s->nInUse++;
- }
-}
-
-
-/*---------------------------------------------------*/
-static
-void generateMTFValues ( EState* s )
-{
- UChar yy[256];
- Int32 i, j;
- Int32 zPend;
- Int32 wr;
- Int32 EOB;
-
- /*
- After sorting (eg, here),
- s->arr1 [ 0 .. s->nblock-1 ] holds sorted order,
- and
- ((UChar*)s->arr2) [ 0 .. s->nblock-1 ]
- holds the original block data.
-
- The first thing to do is generate the MTF values,
- and put them in
- ((UInt16*)s->arr1) [ 0 .. s->nblock-1 ].
- Because there are strictly fewer or equal MTF values
- than block values, ptr values in this area are overwritten
- with MTF values only when they are no longer needed.
-
- The final compressed bitstream is generated into the
- area starting at
- (UChar*) (&((UChar*)s->arr2)[s->nblock])
-
- These storage aliases are set up in bzCompressInit(),
- except for the last one, which is arranged in
- compressBlock().
- */
- UInt32* ptr = s->ptr;
- UChar* block = s->block;
- UInt16* mtfv = s->mtfv;
-
- makeMaps_e ( s );
- EOB = s->nInUse+1;
-
- for (i = 0; i <= EOB; i++) s->mtfFreq[i] = 0;
-
- wr = 0;
- zPend = 0;
- for (i = 0; i < s->nInUse; i++) yy[i] = (UChar) i;
-
- for (i = 0; i < s->nblock; i++) {
- UChar ll_i;
- AssertD ( wr <= i, "generateMTFValues(1)" );
- j = ptr[i]-1; if (j < 0) j += s->nblock;
- ll_i = s->unseqToSeq[block[j]];
- AssertD ( ll_i < s->nInUse, "generateMTFValues(2a)" );
-
- if (yy[0] == ll_i) {
- zPend++;
- } else {
-
- if (zPend > 0) {
- zPend--;
- while (True) {
- if (zPend & 1) {
- mtfv[wr] = BZ_RUNB; wr++;
- s->mtfFreq[BZ_RUNB]++;
- } else {
- mtfv[wr] = BZ_RUNA; wr++;
- s->mtfFreq[BZ_RUNA]++;
- }
- if (zPend < 2) break;
- zPend = (zPend - 2) / 2;
- };
- zPend = 0;
- }
- {
- register UChar rtmp;
- register UChar* ryy_j;
- register UChar rll_i;
- rtmp = yy[1];
- yy[1] = yy[0];
- ryy_j = &(yy[1]);
- rll_i = ll_i;
- while ( rll_i != rtmp ) {
- register UChar rtmp2;
- ryy_j++;
- rtmp2 = rtmp;
- rtmp = *ryy_j;
- *ryy_j = rtmp2;
- };
- yy[0] = rtmp;
- j = ryy_j - &(yy[0]);
- mtfv[wr] = j+1; wr++; s->mtfFreq[j+1]++;
- }
-
- }
- }
-
- if (zPend > 0) {
- zPend--;
- while (True) {
- if (zPend & 1) {
- mtfv[wr] = BZ_RUNB; wr++;
- s->mtfFreq[BZ_RUNB]++;
- } else {
- mtfv[wr] = BZ_RUNA; wr++;
- s->mtfFreq[BZ_RUNA]++;
- }
- if (zPend < 2) break;
- zPend = (zPend - 2) / 2;
- };
- zPend = 0;
- }
-
- mtfv[wr] = EOB; wr++; s->mtfFreq[EOB]++;
-
- s->nMTF = wr;
-}
-
-
-/*---------------------------------------------------*/
-#define BZ_LESSER_ICOST 0
-#define BZ_GREATER_ICOST 15
-
-static
-void sendMTFValues ( EState* s )
-{
- Int32 v, t, i, j, gs, ge, totc, bt, bc, iter;
- Int32 nSelectors, alphaSize, minLen, maxLen, selCtr;
- Int32 nGroups, nBytes;
-
- /*--
- UChar len [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
- is a global since the decoder also needs it.
-
- Int32 code[BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
- Int32 rfreq[BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
- are also globals only used in this proc.
- Made global to keep stack frame size small.
- --*/
-
-
- UInt16 cost[BZ_N_GROUPS];
- Int32 fave[BZ_N_GROUPS];
-
- UInt16* mtfv = s->mtfv;
-
- if (s->verbosity >= 3)
- VPrintf3( " %d in block, %d after MTF & 1-2 coding, "
- "%d+2 syms in use\n",
- s->nblock, s->nMTF, s->nInUse );
-
- alphaSize = s->nInUse+2;
- for (t = 0; t < BZ_N_GROUPS; t++)
- for (v = 0; v < alphaSize; v++)
- s->len[t][v] = BZ_GREATER_ICOST;
-
- /*--- Decide how many coding tables to use ---*/
- AssertH ( s->nMTF > 0, 3001 );
- if (s->nMTF < 200) nGroups = 2; else
- if (s->nMTF < 600) nGroups = 3; else
- if (s->nMTF < 1200) nGroups = 4; else
- if (s->nMTF < 2400) nGroups = 5; else
- nGroups = 6;
-
- /*--- Generate an initial set of coding tables ---*/
- {
- Int32 nPart, remF, tFreq, aFreq;
-
- nPart = nGroups;
- remF = s->nMTF;
- gs = 0;
- while (nPart > 0) {
- tFreq = remF / nPart;
- ge = gs-1;
- aFreq = 0;
- while (aFreq < tFreq && ge < alphaSize-1) {
- ge++;
- aFreq += s->mtfFreq[ge];
- }
-
- if (ge > gs
- && nPart != nGroups && nPart != 1
- && ((nGroups-nPart) % 2 == 1)) {
- aFreq -= s->mtfFreq[ge];
- ge--;
- }
-
- if (s->verbosity >= 3)
- VPrintf5( " initial group %d, [%d .. %d], "
- "has %d syms (%4.1f%%)\n",
- nPart, gs, ge, aFreq,
- (100.0 * (float)aFreq) / (float)(s->nMTF) );
-
- for (v = 0; v < alphaSize; v++)
- if (v >= gs && v <= ge)
- s->len[nPart-1][v] = BZ_LESSER_ICOST; else
- s->len[nPart-1][v] = BZ_GREATER_ICOST;
-
- nPart--;
- gs = ge+1;
- remF -= aFreq;
- }
- }
-
- /*---
- Iterate up to BZ_N_ITERS times to improve the tables.
- ---*/
- for (iter = 0; iter < BZ_N_ITERS; iter++) {
-
- for (t = 0; t < nGroups; t++) fave[t] = 0;
-
- for (t = 0; t < nGroups; t++)
- for (v = 0; v < alphaSize; v++)
- s->rfreq[t][v] = 0;
-
- /*---
- Set up an auxiliary length table which is used to fast-track
- the common case (nGroups == 6).
- ---*/
- if (nGroups == 6) {
- for (v = 0; v < alphaSize; v++) {
- s->len_pack[v][0] = (s->len[1][v] << 16) | s->len[0][v];
- s->len_pack[v][1] = (s->len[3][v] << 16) | s->len[2][v];
- s->len_pack[v][2] = (s->len[5][v] << 16) | s->len[4][v];
- }
- }
-
- nSelectors = 0;
- totc = 0;
- gs = 0;
- while (True) {
-
- /*--- Set group start & end marks. --*/
- if (gs >= s->nMTF) break;
- ge = gs + BZ_G_SIZE - 1;
- if (ge >= s->nMTF) ge = s->nMTF-1;
-
- /*--
- Calculate the cost of this group as coded
- by each of the coding tables.
- --*/
- for (t = 0; t < nGroups; t++) cost[t] = 0;
-
- if (nGroups == 6 && 50 == ge-gs+1) {
- /*--- fast track the common case ---*/
- register UInt32 cost01, cost23, cost45;
- register UInt16 icv;
- cost01 = cost23 = cost45 = 0;
-
-# define BZ_ITER(nn) \
- icv = mtfv[gs+(nn)]; \
- cost01 += s->len_pack[icv][0]; \
- cost23 += s->len_pack[icv][1]; \
- cost45 += s->len_pack[icv][2]; \
-
- BZ_ITER(0); BZ_ITER(1); BZ_ITER(2); BZ_ITER(3); BZ_ITER(4);
- BZ_ITER(5); BZ_ITER(6); BZ_ITER(7); BZ_ITER(8); BZ_ITER(9);
- BZ_ITER(10); BZ_ITER(11); BZ_ITER(12); BZ_ITER(13); BZ_ITER(14);
- BZ_ITER(15); BZ_ITER(16); BZ_ITER(17); BZ_ITER(18); BZ_ITER(19);
- BZ_ITER(20); BZ_ITER(21); BZ_ITER(22); BZ_ITER(23); BZ_ITER(24);
- BZ_ITER(25); BZ_ITER(26); BZ_ITER(27); BZ_ITER(28); BZ_ITER(29);
- BZ_ITER(30); BZ_ITER(31); BZ_ITER(32); BZ_ITER(33); BZ_ITER(34);
- BZ_ITER(35); BZ_ITER(36); BZ_ITER(37); BZ_ITER(38); BZ_ITER(39);
- BZ_ITER(40); BZ_ITER(41); BZ_ITER(42); BZ_ITER(43); BZ_ITER(44);
- BZ_ITER(45); BZ_ITER(46); BZ_ITER(47); BZ_ITER(48); BZ_ITER(49);
-
-# undef BZ_ITER
-
- cost[0] = cost01 & 0xffff; cost[1] = cost01 >> 16;
- cost[2] = cost23 & 0xffff; cost[3] = cost23 >> 16;
- cost[4] = cost45 & 0xffff; cost[5] = cost45 >> 16;
-
- } else {
- /*--- slow version which correctly handles all situations ---*/
- for (i = gs; i <= ge; i++) {
- UInt16 icv = mtfv[i];
- for (t = 0; t < nGroups; t++) cost[t] += s->len[t][icv];
- }
- }
-
- /*--
- Find the coding table which is best for this group,
- and record its identity in the selector table.
- --*/
- bc = 999999999; bt = -1;
- for (t = 0; t < nGroups; t++)
- if (cost[t] < bc) { bc = cost[t]; bt = t; };
- totc += bc;
- fave[bt]++;
- s->selector[nSelectors] = bt;
- nSelectors++;
-
- /*--
- Increment the symbol frequencies for the selected table.
- --*/
- if (nGroups == 6 && 50 == ge-gs+1) {
- /*--- fast track the common case ---*/
-
-# define BZ_ITUR(nn) s->rfreq[bt][ mtfv[gs+(nn)] ]++
-
- BZ_ITUR(0); BZ_ITUR(1); BZ_ITUR(2); BZ_ITUR(3); BZ_ITUR(4);
- BZ_ITUR(5); BZ_ITUR(6); BZ_ITUR(7); BZ_ITUR(8); BZ_ITUR(9);
- BZ_ITUR(10); BZ_ITUR(11); BZ_ITUR(12); BZ_ITUR(13); BZ_ITUR(14);
- BZ_ITUR(15); BZ_ITUR(16); BZ_ITUR(17); BZ_ITUR(18); BZ_ITUR(19);
- BZ_ITUR(20); BZ_ITUR(21); BZ_ITUR(22); BZ_ITUR(23); BZ_ITUR(24);
- BZ_ITUR(25); BZ_ITUR(26); BZ_ITUR(27); BZ_ITUR(28); BZ_ITUR(29);
- BZ_ITUR(30); BZ_ITUR(31); BZ_ITUR(32); BZ_ITUR(33); BZ_ITUR(34);
- BZ_ITUR(35); BZ_ITUR(36); BZ_ITUR(37); BZ_ITUR(38); BZ_ITUR(39);
- BZ_ITUR(40); BZ_ITUR(41); BZ_ITUR(42); BZ_ITUR(43); BZ_ITUR(44);
- BZ_ITUR(45); BZ_ITUR(46); BZ_ITUR(47); BZ_ITUR(48); BZ_ITUR(49);
-
-# undef BZ_ITUR
-
- } else {
- /*--- slow version which correctly handles all situations ---*/
- for (i = gs; i <= ge; i++)
- s->rfreq[bt][ mtfv[i] ]++;
- }
-
- gs = ge+1;
- }
- if (s->verbosity >= 3) {
- VPrintf2 ( " pass %d: size is %d, grp uses are ",
- iter+1, totc/8 );
- for (t = 0; t < nGroups; t++)
- VPrintf1 ( "%d ", fave[t] );
- VPrintf0 ( "\n" );
- }
-
- /*--
- Recompute the tables based on the accumulated frequencies.
- --*/
- for (t = 0; t < nGroups; t++)
- BZ2_hbMakeCodeLengths ( &(s->len[t][0]), &(s->rfreq[t][0]),
- alphaSize, 20 );
- }
-
-
- AssertH( nGroups < 8, 3002 );
- AssertH( nSelectors < 32768 &&
- nSelectors <= (2 + (900000 / BZ_G_SIZE)),
- 3003 );
-
-
- /*--- Compute MTF values for the selectors. ---*/
- {
- UChar pos[BZ_N_GROUPS], ll_i, tmp2, tmp;
- for (i = 0; i < nGroups; i++) pos[i] = i;
- for (i = 0; i < nSelectors; i++) {
- ll_i = s->selector[i];
- j = 0;
- tmp = pos[j];
- while ( ll_i != tmp ) {
- j++;
- tmp2 = tmp;
- tmp = pos[j];
- pos[j] = tmp2;
- };
- pos[0] = tmp;
- s->selectorMtf[i] = j;
- }
- };
-
- /*--- Assign actual codes for the tables. --*/
- for (t = 0; t < nGroups; t++) {
- minLen = 32;
- maxLen = 0;
- for (i = 0; i < alphaSize; i++) {
- if (s->len[t][i] > maxLen) maxLen = s->len[t][i];
- if (s->len[t][i] < minLen) minLen = s->len[t][i];
- }
- AssertH ( !(maxLen > 20), 3004 );
- AssertH ( !(minLen < 1), 3005 );
- BZ2_hbAssignCodes ( &(s->code[t][0]), &(s->len[t][0]),
- minLen, maxLen, alphaSize );
- }
-
- /*--- Transmit the mapping table. ---*/
- {
- Bool inUse16[16];
- for (i = 0; i < 16; i++) {
- inUse16[i] = False;
- for (j = 0; j < 16; j++)
- if (s->inUse[i * 16 + j]) inUse16[i] = True;
- }
-
- nBytes = s->numZ;
- for (i = 0; i < 16; i++)
- if (inUse16[i]) bsW(s,1,1); else bsW(s,1,0);
-
- for (i = 0; i < 16; i++)
- if (inUse16[i])
- for (j = 0; j < 16; j++) {
- if (s->inUse[i * 16 + j]) bsW(s,1,1); else bsW(s,1,0);
- }
-
- if (s->verbosity >= 3)
- VPrintf1( " bytes: mapping %d, ", s->numZ-nBytes );
- }
-
- /*--- Now the selectors. ---*/
- nBytes = s->numZ;
- bsW ( s, 3, nGroups );
- bsW ( s, 15, nSelectors );
- for (i = 0; i < nSelectors; i++) {
- for (j = 0; j < s->selectorMtf[i]; j++) bsW(s,1,1);
- bsW(s,1,0);
- }
- if (s->verbosity >= 3)
- VPrintf1( "selectors %d, ", s->numZ-nBytes );
-
- /*--- Now the coding tables. ---*/
- nBytes = s->numZ;
-
- for (t = 0; t < nGroups; t++) {
- Int32 curr = s->len[t][0];
- bsW ( s, 5, curr );
- for (i = 0; i < alphaSize; i++) {
- while (curr < s->len[t][i]) { bsW(s,2,2); curr++; /* 10 */ };
- while (curr > s->len[t][i]) { bsW(s,2,3); curr--; /* 11 */ };
- bsW ( s, 1, 0 );
- }
- }
-
- if (s->verbosity >= 3)
- VPrintf1 ( "code lengths %d, ", s->numZ-nBytes );
-
- /*--- And finally, the block data proper ---*/
- nBytes = s->numZ;
- selCtr = 0;
- gs = 0;
- while (True) {
- if (gs >= s->nMTF) break;
- ge = gs + BZ_G_SIZE - 1;
- if (ge >= s->nMTF) ge = s->nMTF-1;
- AssertH ( s->selector[selCtr] < nGroups, 3006 );
-
- if (nGroups == 6 && 50 == ge-gs+1) {
- /*--- fast track the common case ---*/
- UInt16 mtfv_i;
- UChar* s_len_sel_selCtr
- = &(s->len[s->selector[selCtr]][0]);
- Int32* s_code_sel_selCtr
- = &(s->code[s->selector[selCtr]][0]);
-
-# define BZ_ITAH(nn) \
- mtfv_i = mtfv[gs+(nn)]; \
- bsW ( s, \
- s_len_sel_selCtr[mtfv_i], \
- s_code_sel_selCtr[mtfv_i] )
-
- BZ_ITAH(0); BZ_ITAH(1); BZ_ITAH(2); BZ_ITAH(3); BZ_ITAH(4);
- BZ_ITAH(5); BZ_ITAH(6); BZ_ITAH(7); BZ_ITAH(8); BZ_ITAH(9);
- BZ_ITAH(10); BZ_ITAH(11); BZ_ITAH(12); BZ_ITAH(13); BZ_ITAH(14);
- BZ_ITAH(15); BZ_ITAH(16); BZ_ITAH(17); BZ_ITAH(18); BZ_ITAH(19);
- BZ_ITAH(20); BZ_ITAH(21); BZ_ITAH(22); BZ_ITAH(23); BZ_ITAH(24);
- BZ_ITAH(25); BZ_ITAH(26); BZ_ITAH(27); BZ_ITAH(28); BZ_ITAH(29);
- BZ_ITAH(30); BZ_ITAH(31); BZ_ITAH(32); BZ_ITAH(33); BZ_ITAH(34);
- BZ_ITAH(35); BZ_ITAH(36); BZ_ITAH(37); BZ_ITAH(38); BZ_ITAH(39);
- BZ_ITAH(40); BZ_ITAH(41); BZ_ITAH(42); BZ_ITAH(43); BZ_ITAH(44);
- BZ_ITAH(45); BZ_ITAH(46); BZ_ITAH(47); BZ_ITAH(48); BZ_ITAH(49);
-
-# undef BZ_ITAH
-
- } else {
- /*--- slow version which correctly handles all situations ---*/
- for (i = gs; i <= ge; i++) {
- bsW ( s,
- s->len [s->selector[selCtr]] [mtfv[i]],
- s->code [s->selector[selCtr]] [mtfv[i]] );
- }
- }
-
-
- gs = ge+1;
- selCtr++;
- }
- AssertH( selCtr == nSelectors, 3007 );
-
- if (s->verbosity >= 3)
- VPrintf1( "codes %d\n", s->numZ-nBytes );
-}
-
-
-/*---------------------------------------------------*/
-void BZ2_compressBlock ( EState* s, Bool is_last_block )
-{
- if (s->nblock > 0) {
-
- BZ_FINALISE_CRC ( s->blockCRC );
- s->combinedCRC = (s->combinedCRC << 1) | (s->combinedCRC >> 31);
- s->combinedCRC ^= s->blockCRC;
- if (s->blockNo > 1) s->numZ = 0;
-
- if (s->verbosity >= 2)
- VPrintf4( " block %d: crc = 0x%8x, "
- "combined CRC = 0x%8x, size = %d\n",
- s->blockNo, s->blockCRC, s->combinedCRC, s->nblock );
-
- BZ2_blockSort ( s );
- }
-
- s->zbits = (UChar*) (&((UChar*)s->arr2)[s->nblock]);
-
- /*-- If this is the first block, create the stream header. --*/
- if (s->blockNo == 1) {
- BZ2_bsInitWrite ( s );
- bsPutUChar ( s, 'B' );
- bsPutUChar ( s, 'Z' );
- bsPutUChar ( s, 'h' );
- bsPutUChar ( s, (UChar)('0' + s->blockSize100k) );
- }
-
- if (s->nblock > 0) {
-
- bsPutUChar ( s, 0x31 ); bsPutUChar ( s, 0x41 );
- bsPutUChar ( s, 0x59 ); bsPutUChar ( s, 0x26 );
- bsPutUChar ( s, 0x53 ); bsPutUChar ( s, 0x59 );
-
- /*-- Now the block's CRC, so it is in a known place. --*/
- bsPutUInt32 ( s, s->blockCRC );
-
- /*--
- Now a single bit indicating (non-)randomisation.
- As of version 0.9.5, we use a better sorting algorithm
- which makes randomisation unnecessary. So always set
- the randomised bit to 'no'. Of course, the decoder
- still needs to be able to handle randomised blocks
- so as to maintain backwards compatibility with
- older versions of bzip2.
- --*/
- bsW(s,1,0);
-
- bsW ( s, 24, s->origPtr );
- generateMTFValues ( s );
- sendMTFValues ( s );
- }
-
-
- /*-- If this is the last block, add the stream trailer. --*/
- if (is_last_block) {
-
- bsPutUChar ( s, 0x17 ); bsPutUChar ( s, 0x72 );
- bsPutUChar ( s, 0x45 ); bsPutUChar ( s, 0x38 );
- bsPutUChar ( s, 0x50 ); bsPutUChar ( s, 0x90 );
- bsPutUInt32 ( s, s->combinedCRC );
- if (s->verbosity >= 2)
- VPrintf1( " final combined CRC = 0x%x\n ", s->combinedCRC );
- bsFinishWrite ( s );
- }
-}
-
-
-/*-------------------------------------------------------------*/
-/*--- end compress.c ---*/
-/*-------------------------------------------------------------*/
+++ /dev/null
-
-/*-------------------------------------------------------------*/
-/*--- Table for doing CRCs ---*/
-/*--- crctable.c ---*/
-/*-------------------------------------------------------------*/
-
-/*--
- This file is a part of bzip2 and/or libbzip2, a program and
- library for lossless, block-sorting data compression.
-
- Copyright (C) 1996-2000 Julian R Seward. All rights reserved.
-
- Redistribution and use in source and binary forms, with or without
- modification, are permitted provided that the following conditions
- are met:
-
- 1. Redistributions of source code must retain the above copyright
- notice, this list of conditions and the following disclaimer.
-
- 2. The origin of this software must not be misrepresented; you must
- not claim that you wrote the original software. If you use this
- software in a product, an acknowledgment in the product
- documentation would be appreciated but is not required.
-
- 3. Altered source versions must be plainly marked as such, and must
- not be misrepresented as being the original software.
-
- 4. The name of the author may not be used to endorse or promote
- products derived from this software without specific prior written
- permission.
-
- THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
- OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
- DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
- GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
- Julian Seward, Cambridge, UK.
- jseward@acm.org
- bzip2/libbzip2 version 1.0 of 21 March 2000
-
- This program is based on (at least) the work of:
- Mike Burrows
- David Wheeler
- Peter Fenwick
- Alistair Moffat
- Radford Neal
- Ian H. Witten
- Robert Sedgewick
- Jon L. Bentley
-
- For more information on these sources, see the manual.
---*/
-
-
-#include "bzlib_private.h"
-
-/*--
- I think this is an implementation of the AUTODIN-II,
- Ethernet & FDDI 32-bit CRC standard. Vaguely derived
- from code by Rob Warnock, in Section 51 of the
- comp.compression FAQ.
---*/
-
-UInt32 BZ2_crc32Table[256] = {
-
- /*-- Ugly, innit? --*/
-
- 0x00000000L, 0x04c11db7L, 0x09823b6eL, 0x0d4326d9L,
- 0x130476dcL, 0x17c56b6bL, 0x1a864db2L, 0x1e475005L,
- 0x2608edb8L, 0x22c9f00fL, 0x2f8ad6d6L, 0x2b4bcb61L,
- 0x350c9b64L, 0x31cd86d3L, 0x3c8ea00aL, 0x384fbdbdL,
- 0x4c11db70L, 0x48d0c6c7L, 0x4593e01eL, 0x4152fda9L,
- 0x5f15adacL, 0x5bd4b01bL, 0x569796c2L, 0x52568b75L,
- 0x6a1936c8L, 0x6ed82b7fL, 0x639b0da6L, 0x675a1011L,
- 0x791d4014L, 0x7ddc5da3L, 0x709f7b7aL, 0x745e66cdL,
- 0x9823b6e0L, 0x9ce2ab57L, 0x91a18d8eL, 0x95609039L,
- 0x8b27c03cL, 0x8fe6dd8bL, 0x82a5fb52L, 0x8664e6e5L,
- 0xbe2b5b58L, 0xbaea46efL, 0xb7a96036L, 0xb3687d81L,
- 0xad2f2d84L, 0xa9ee3033L, 0xa4ad16eaL, 0xa06c0b5dL,
- 0xd4326d90L, 0xd0f37027L, 0xddb056feL, 0xd9714b49L,
- 0xc7361b4cL, 0xc3f706fbL, 0xceb42022L, 0xca753d95L,
- 0xf23a8028L, 0xf6fb9d9fL, 0xfbb8bb46L, 0xff79a6f1L,
- 0xe13ef6f4L, 0xe5ffeb43L, 0xe8bccd9aL, 0xec7dd02dL,
- 0x34867077L, 0x30476dc0L, 0x3d044b19L, 0x39c556aeL,
- 0x278206abL, 0x23431b1cL, 0x2e003dc5L, 0x2ac12072L,
- 0x128e9dcfL, 0x164f8078L, 0x1b0ca6a1L, 0x1fcdbb16L,
- 0x018aeb13L, 0x054bf6a4L, 0x0808d07dL, 0x0cc9cdcaL,
- 0x7897ab07L, 0x7c56b6b0L, 0x71159069L, 0x75d48ddeL,
- 0x6b93dddbL, 0x6f52c06cL, 0x6211e6b5L, 0x66d0fb02L,
- 0x5e9f46bfL, 0x5a5e5b08L, 0x571d7dd1L, 0x53dc6066L,
- 0x4d9b3063L, 0x495a2dd4L, 0x44190b0dL, 0x40d816baL,
- 0xaca5c697L, 0xa864db20L, 0xa527fdf9L, 0xa1e6e04eL,
- 0xbfa1b04bL, 0xbb60adfcL, 0xb6238b25L, 0xb2e29692L,
- 0x8aad2b2fL, 0x8e6c3698L, 0x832f1041L, 0x87ee0df6L,
- 0x99a95df3L, 0x9d684044L, 0x902b669dL, 0x94ea7b2aL,
- 0xe0b41de7L, 0xe4750050L, 0xe9362689L, 0xedf73b3eL,
- 0xf3b06b3bL, 0xf771768cL, 0xfa325055L, 0xfef34de2L,
- 0xc6bcf05fL, 0xc27dede8L, 0xcf3ecb31L, 0xcbffd686L,
- 0xd5b88683L, 0xd1799b34L, 0xdc3abdedL, 0xd8fba05aL,
- 0x690ce0eeL, 0x6dcdfd59L, 0x608edb80L, 0x644fc637L,
- 0x7a089632L, 0x7ec98b85L, 0x738aad5cL, 0x774bb0ebL,
- 0x4f040d56L, 0x4bc510e1L, 0x46863638L, 0x42472b8fL,
- 0x5c007b8aL, 0x58c1663dL, 0x558240e4L, 0x51435d53L,
- 0x251d3b9eL, 0x21dc2629L, 0x2c9f00f0L, 0x285e1d47L,
- 0x36194d42L, 0x32d850f5L, 0x3f9b762cL, 0x3b5a6b9bL,
- 0x0315d626L, 0x07d4cb91L, 0x0a97ed48L, 0x0e56f0ffL,
- 0x1011a0faL, 0x14d0bd4dL, 0x19939b94L, 0x1d528623L,
- 0xf12f560eL, 0xf5ee4bb9L, 0xf8ad6d60L, 0xfc6c70d7L,
- 0xe22b20d2L, 0xe6ea3d65L, 0xeba91bbcL, 0xef68060bL,
- 0xd727bbb6L, 0xd3e6a601L, 0xdea580d8L, 0xda649d6fL,
- 0xc423cd6aL, 0xc0e2d0ddL, 0xcda1f604L, 0xc960ebb3L,
- 0xbd3e8d7eL, 0xb9ff90c9L, 0xb4bcb610L, 0xb07daba7L,
- 0xae3afba2L, 0xaafbe615L, 0xa7b8c0ccL, 0xa379dd7bL,
- 0x9b3660c6L, 0x9ff77d71L, 0x92b45ba8L, 0x9675461fL,
- 0x8832161aL, 0x8cf30badL, 0x81b02d74L, 0x857130c3L,
- 0x5d8a9099L, 0x594b8d2eL, 0x5408abf7L, 0x50c9b640L,
- 0x4e8ee645L, 0x4a4ffbf2L, 0x470cdd2bL, 0x43cdc09cL,
- 0x7b827d21L, 0x7f436096L, 0x7200464fL, 0x76c15bf8L,
- 0x68860bfdL, 0x6c47164aL, 0x61043093L, 0x65c52d24L,
- 0x119b4be9L, 0x155a565eL, 0x18197087L, 0x1cd86d30L,
- 0x029f3d35L, 0x065e2082L, 0x0b1d065bL, 0x0fdc1becL,
- 0x3793a651L, 0x3352bbe6L, 0x3e119d3fL, 0x3ad08088L,
- 0x2497d08dL, 0x2056cd3aL, 0x2d15ebe3L, 0x29d4f654L,
- 0xc5a92679L, 0xc1683bceL, 0xcc2b1d17L, 0xc8ea00a0L,
- 0xd6ad50a5L, 0xd26c4d12L, 0xdf2f6bcbL, 0xdbee767cL,
- 0xe3a1cbc1L, 0xe760d676L, 0xea23f0afL, 0xeee2ed18L,
- 0xf0a5bd1dL, 0xf464a0aaL, 0xf9278673L, 0xfde69bc4L,
- 0x89b8fd09L, 0x8d79e0beL, 0x803ac667L, 0x84fbdbd0L,
- 0x9abc8bd5L, 0x9e7d9662L, 0x933eb0bbL, 0x97ffad0cL,
- 0xafb010b1L, 0xab710d06L, 0xa6322bdfL, 0xa2f33668L,
- 0xbcb4666dL, 0xb8757bdaL, 0xb5365d03L, 0xb1f740b4L
-};
-
-
-/*-------------------------------------------------------------*/
-/*--- end crctable.c ---*/
-/*-------------------------------------------------------------*/
+++ /dev/null
-
-/*-------------------------------------------------------------*/
-/*--- Decompression machinery ---*/
-/*--- decompress.c ---*/
-/*-------------------------------------------------------------*/
-
-/*--
- This file is a part of bzip2 and/or libbzip2, a program and
- library for lossless, block-sorting data compression.
-
- Copyright (C) 1996-2000 Julian R Seward. All rights reserved.
-
- Redistribution and use in source and binary forms, with or without
- modification, are permitted provided that the following conditions
- are met:
-
- 1. Redistributions of source code must retain the above copyright
- notice, this list of conditions and the following disclaimer.
-
- 2. The origin of this software must not be misrepresented; you must
- not claim that you wrote the original software. If you use this
- software in a product, an acknowledgment in the product
- documentation would be appreciated but is not required.
-
- 3. Altered source versions must be plainly marked as such, and must
- not be misrepresented as being the original software.
-
- 4. The name of the author may not be used to endorse or promote
- products derived from this software without specific prior written
- permission.
-
- THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
- OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
- DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
- GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
- Julian Seward, Cambridge, UK.
- jseward@acm.org
- bzip2/libbzip2 version 1.0 of 21 March 2000
-
- This program is based on (at least) the work of:
- Mike Burrows
- David Wheeler
- Peter Fenwick
- Alistair Moffat
- Radford Neal
- Ian H. Witten
- Robert Sedgewick
- Jon L. Bentley
-
- For more information on these sources, see the manual.
---*/
-
-
-#include "bzlib_private.h"
-
-
-/*---------------------------------------------------*/
-static
-void makeMaps_d ( DState* s )
-{
- Int32 i;
- s->nInUse = 0;
- for (i = 0; i < 256; i++)
- if (s->inUse[i]) {
- s->seqToUnseq[s->nInUse] = i;
- s->nInUse++;
- }
-}
-
-
-/*---------------------------------------------------*/
-#define RETURN(rrr) \
- { retVal = rrr; goto save_state_and_return; };
-
-#define GET_BITS(lll,vvv,nnn) \
- case lll: s->state = lll; \
- while (True) { \
- if (s->bsLive >= nnn) { \
- UInt32 v; \
- v = (s->bsBuff >> \
- (s->bsLive-nnn)) & ((1 << nnn)-1); \
- s->bsLive -= nnn; \
- vvv = v; \
- break; \
- } \
- if (s->strm->avail_in == 0) RETURN(BZ_OK); \
- s->bsBuff \
- = (s->bsBuff << 8) | \
- ((UInt32) \
- (*((UChar*)(s->strm->next_in)))); \
- s->bsLive += 8; \
- s->strm->next_in++; \
- s->strm->avail_in--; \
- s->strm->total_in_lo32++; \
- if (s->strm->total_in_lo32 == 0) \
- s->strm->total_in_hi32++; \
- }
-
-#define GET_UCHAR(lll,uuu) \
- GET_BITS(lll,uuu,8)
-
-#define GET_BIT(lll,uuu) \
- GET_BITS(lll,uuu,1)
-
-/*---------------------------------------------------*/
-#define GET_MTF_VAL(label1,label2,lval) \
-{ \
- if (groupPos == 0) { \
- groupNo++; \
- if (groupNo >= nSelectors) \
- RETURN(BZ_DATA_ERROR); \
- groupPos = BZ_G_SIZE; \
- gSel = s->selector[groupNo]; \
- gMinlen = s->minLens[gSel]; \
- gLimit = &(s->limit[gSel][0]); \
- gPerm = &(s->perm[gSel][0]); \
- gBase = &(s->base[gSel][0]); \
- } \
- groupPos--; \
- zn = gMinlen; \
- GET_BITS(label1, zvec, zn); \
- while (1) { \
- if (zn > 20 /* the longest code */) \
- RETURN(BZ_DATA_ERROR); \
- if (zvec <= gLimit[zn]) break; \
- zn++; \
- GET_BIT(label2, zj); \
- zvec = (zvec << 1) | zj; \
- }; \
- if (zvec - gBase[zn] < 0 \
- || zvec - gBase[zn] >= BZ_MAX_ALPHA_SIZE) \
- RETURN(BZ_DATA_ERROR); \
- lval = gPerm[zvec - gBase[zn]]; \
-}
-
-
-/*---------------------------------------------------*/
-Int32 BZ2_decompress ( DState* s )
-{
- UChar uc;
- Int32 retVal;
- Int32 minLen, maxLen;
- bz_stream* strm = s->strm;
-
- /* stuff that needs to be saved/restored */
- Int32 i;
- Int32 j;
- Int32 t;
- Int32 alphaSize;
- Int32 nGroups;
- Int32 nSelectors;
- Int32 EOB;
- Int32 groupNo;
- Int32 groupPos;
- Int32 nextSym;
- Int32 nblockMAX;
- Int32 nblock;
- Int32 es;
- Int32 N;
- Int32 curr;
- Int32 zt;
- Int32 zn;
- Int32 zvec;
- Int32 zj;
- Int32 gSel;
- Int32 gMinlen;
- Int32* gLimit;
- Int32* gBase;
- Int32* gPerm;
-
- if (s->state == BZ_X_MAGIC_1) {
- /*initialise the save area*/
- s->save_i = 0;
- s->save_j = 0;
- s->save_t = 0;
- s->save_alphaSize = 0;
- s->save_nGroups = 0;
- s->save_nSelectors = 0;
- s->save_EOB = 0;
- s->save_groupNo = 0;
- s->save_groupPos = 0;
- s->save_nextSym = 0;
- s->save_nblockMAX = 0;
- s->save_nblock = 0;
- s->save_es = 0;
- s->save_N = 0;
- s->save_curr = 0;
- s->save_zt = 0;
- s->save_zn = 0;
- s->save_zvec = 0;
- s->save_zj = 0;
- s->save_gSel = 0;
- s->save_gMinlen = 0;
- s->save_gLimit = NULL;
- s->save_gBase = NULL;
- s->save_gPerm = NULL;
- }
-
- /*restore from the save area*/
- i = s->save_i;
- j = s->save_j;
- t = s->save_t;
- alphaSize = s->save_alphaSize;
- nGroups = s->save_nGroups;
- nSelectors = s->save_nSelectors;
- EOB = s->save_EOB;
- groupNo = s->save_groupNo;
- groupPos = s->save_groupPos;
- nextSym = s->save_nextSym;
- nblockMAX = s->save_nblockMAX;
- nblock = s->save_nblock;
- es = s->save_es;
- N = s->save_N;
- curr = s->save_curr;
- zt = s->save_zt;
- zn = s->save_zn;
- zvec = s->save_zvec;
- zj = s->save_zj;
- gSel = s->save_gSel;
- gMinlen = s->save_gMinlen;
- gLimit = s->save_gLimit;
- gBase = s->save_gBase;
- gPerm = s->save_gPerm;
-
- retVal = BZ_OK;
-
- switch (s->state) {
-
- GET_UCHAR(BZ_X_MAGIC_1, uc);
- if (uc != 'B') RETURN(BZ_DATA_ERROR_MAGIC);
-
- GET_UCHAR(BZ_X_MAGIC_2, uc);
- if (uc != 'Z') RETURN(BZ_DATA_ERROR_MAGIC);
-
- GET_UCHAR(BZ_X_MAGIC_3, uc)
- if (uc != 'h') RETURN(BZ_DATA_ERROR_MAGIC);
-
- GET_BITS(BZ_X_MAGIC_4, s->blockSize100k, 8)
- if (s->blockSize100k < '1' ||
- s->blockSize100k > '9') RETURN(BZ_DATA_ERROR_MAGIC);
- s->blockSize100k -= '0';
-
- if (s->smallDecompress) {
- s->ll16 = BZALLOC( s->blockSize100k * 100000 * sizeof(UInt16) );
- s->ll4 = BZALLOC(
- ((1 + s->blockSize100k * 100000) >> 1) * sizeof(UChar)
- );
- if (s->ll16 == NULL || s->ll4 == NULL) RETURN(BZ_MEM_ERROR);
- } else {
- s->tt = BZALLOC( s->blockSize100k * 100000 * sizeof(Int32) );
- if (s->tt == NULL) RETURN(BZ_MEM_ERROR);
- }
-
- GET_UCHAR(BZ_X_BLKHDR_1, uc);
-
- if (uc == 0x17) goto endhdr_2;
- if (uc != 0x31) RETURN(BZ_DATA_ERROR);
- GET_UCHAR(BZ_X_BLKHDR_2, uc);
- if (uc != 0x41) RETURN(BZ_DATA_ERROR);
- GET_UCHAR(BZ_X_BLKHDR_3, uc);
- if (uc != 0x59) RETURN(BZ_DATA_ERROR);
- GET_UCHAR(BZ_X_BLKHDR_4, uc);
- if (uc != 0x26) RETURN(BZ_DATA_ERROR);
- GET_UCHAR(BZ_X_BLKHDR_5, uc);
- if (uc != 0x53) RETURN(BZ_DATA_ERROR);
- GET_UCHAR(BZ_X_BLKHDR_6, uc);
- if (uc != 0x59) RETURN(BZ_DATA_ERROR);
-
- s->currBlockNo++;
- if (s->verbosity >= 2)
- VPrintf1 ( "\n [%d: huff+mtf ", s->currBlockNo );
-
- s->storedBlockCRC = 0;
- GET_UCHAR(BZ_X_BCRC_1, uc);
- s->storedBlockCRC = (s->storedBlockCRC << 8) | ((UInt32)uc);
- GET_UCHAR(BZ_X_BCRC_2, uc);
- s->storedBlockCRC = (s->storedBlockCRC << 8) | ((UInt32)uc);
- GET_UCHAR(BZ_X_BCRC_3, uc);
- s->storedBlockCRC = (s->storedBlockCRC << 8) | ((UInt32)uc);
- GET_UCHAR(BZ_X_BCRC_4, uc);
- s->storedBlockCRC = (s->storedBlockCRC << 8) | ((UInt32)uc);
-
- GET_BITS(BZ_X_RANDBIT, s->blockRandomised, 1);
-
- s->origPtr = 0;
- GET_UCHAR(BZ_X_ORIGPTR_1, uc);
- s->origPtr = (s->origPtr << 8) | ((Int32)uc);
- GET_UCHAR(BZ_X_ORIGPTR_2, uc);
- s->origPtr = (s->origPtr << 8) | ((Int32)uc);
- GET_UCHAR(BZ_X_ORIGPTR_3, uc);
- s->origPtr = (s->origPtr << 8) | ((Int32)uc);
-
- if (s->origPtr < 0)
- RETURN(BZ_DATA_ERROR);
- if (s->origPtr > 10 + 100000*s->blockSize100k)
- RETURN(BZ_DATA_ERROR);
-
- /*--- Receive the mapping table ---*/
- for (i = 0; i < 16; i++) {
- GET_BIT(BZ_X_MAPPING_1, uc);
- if (uc == 1)
- s->inUse16[i] = True; else
- s->inUse16[i] = False;
- }
-
- for (i = 0; i < 256; i++) s->inUse[i] = False;
-
- for (i = 0; i < 16; i++)
- if (s->inUse16[i])
- for (j = 0; j < 16; j++) {
- GET_BIT(BZ_X_MAPPING_2, uc);
- if (uc == 1) s->inUse[i * 16 + j] = True;
- }
- makeMaps_d ( s );
- if (s->nInUse == 0) RETURN(BZ_DATA_ERROR);
- alphaSize = s->nInUse+2;
-
- /*--- Now the selectors ---*/
- GET_BITS(BZ_X_SELECTOR_1, nGroups, 3);
- if (nGroups < 2 || nGroups > 6) RETURN(BZ_DATA_ERROR);
- GET_BITS(BZ_X_SELECTOR_2, nSelectors, 15);
- if (nSelectors < 1) RETURN(BZ_DATA_ERROR);
- for (i = 0; i < nSelectors; i++) {
- j = 0;
- while (True) {
- GET_BIT(BZ_X_SELECTOR_3, uc);
- if (uc == 0) break;
- j++;
- if (j >= nGroups) RETURN(BZ_DATA_ERROR);
- }
- s->selectorMtf[i] = j;
- }
-
- /*--- Undo the MTF values for the selectors. ---*/
- {
- UChar pos[BZ_N_GROUPS], tmp, v;
- for (v = 0; v < nGroups; v++) pos[v] = v;
-
- for (i = 0; i < nSelectors; i++) {
- v = s->selectorMtf[i];
- tmp = pos[v];
- while (v > 0) { pos[v] = pos[v-1]; v--; }
- pos[0] = tmp;
- s->selector[i] = tmp;
- }
- }
-
- /*--- Now the coding tables ---*/
- for (t = 0; t < nGroups; t++) {
- GET_BITS(BZ_X_CODING_1, curr, 5);
- for (i = 0; i < alphaSize; i++) {
- while (True) {
- if (curr < 1 || curr > 20) RETURN(BZ_DATA_ERROR);
- GET_BIT(BZ_X_CODING_2, uc);
- if (uc == 0) break;
- GET_BIT(BZ_X_CODING_3, uc);
- if (uc == 0) curr++; else curr--;
- }
- s->len[t][i] = curr;
- }
- }
-
- /*--- Create the Huffman decoding tables ---*/
- for (t = 0; t < nGroups; t++) {
- minLen = 32;
- maxLen = 0;
- for (i = 0; i < alphaSize; i++) {
- if (s->len[t][i] > maxLen) maxLen = s->len[t][i];
- if (s->len[t][i] < minLen) minLen = s->len[t][i];
- }
- BZ2_hbCreateDecodeTables (
- &(s->limit[t][0]),
- &(s->base[t][0]),
- &(s->perm[t][0]),
- &(s->len[t][0]),
- minLen, maxLen, alphaSize
- );
- s->minLens[t] = minLen;
- }
-
- /*--- Now the MTF values ---*/
-
- EOB = s->nInUse+1;
- nblockMAX = 100000 * s->blockSize100k;
- groupNo = -1;
- groupPos = 0;
-
- for (i = 0; i <= 255; i++) s->unzftab[i] = 0;
-
- /*-- MTF init --*/
- {
- Int32 ii, jj, kk;
- kk = MTFA_SIZE-1;
- for (ii = 256 / MTFL_SIZE - 1; ii >= 0; ii--) {
- for (jj = MTFL_SIZE-1; jj >= 0; jj--) {
- s->mtfa[kk] = (UChar)(ii * MTFL_SIZE + jj);
- kk--;
- }
- s->mtfbase[ii] = kk + 1;
- }
- }
- /*-- end MTF init --*/
-
- nblock = 0;
- GET_MTF_VAL(BZ_X_MTF_1, BZ_X_MTF_2, nextSym);
-
- while (True) {
-
- if (nextSym == EOB) break;
-
- if (nextSym == BZ_RUNA || nextSym == BZ_RUNB) {
-
- es = -1;
- N = 1;
- do {
- if (nextSym == BZ_RUNA) es = es + (0+1) * N; else
- if (nextSym == BZ_RUNB) es = es + (1+1) * N;
- N = N * 2;
- GET_MTF_VAL(BZ_X_MTF_3, BZ_X_MTF_4, nextSym);
- }
- while (nextSym == BZ_RUNA || nextSym == BZ_RUNB);
-
- es++;
- uc = s->seqToUnseq[ s->mtfa[s->mtfbase[0]] ];
- s->unzftab[uc] += es;
-
- if (s->smallDecompress)
- while (es > 0) {
- if (nblock >= nblockMAX) RETURN(BZ_DATA_ERROR);
- s->ll16[nblock] = (UInt16)uc;
- nblock++;
- es--;
- }
- else
- while (es > 0) {
- if (nblock >= nblockMAX) RETURN(BZ_DATA_ERROR);
- s->tt[nblock] = (UInt32)uc;
- nblock++;
- es--;
- };
-
- continue;
-
- } else {
-
- if (nblock >= nblockMAX) RETURN(BZ_DATA_ERROR);
-
- /*-- uc = MTF ( nextSym-1 ) --*/
- {
- Int32 ii, jj, kk, pp, lno, off;
- UInt32 nn;
- nn = (UInt32)(nextSym - 1);
-
- if (nn < MTFL_SIZE) {
- /* avoid general-case expense */
- pp = s->mtfbase[0];
- uc = s->mtfa[pp+nn];
- while (nn > 3) {
- Int32 z = pp+nn;
- s->mtfa[(z) ] = s->mtfa[(z)-1];
- s->mtfa[(z)-1] = s->mtfa[(z)-2];
- s->mtfa[(z)-2] = s->mtfa[(z)-3];
- s->mtfa[(z)-3] = s->mtfa[(z)-4];
- nn -= 4;
- }
- while (nn > 0) {
- s->mtfa[(pp+nn)] = s->mtfa[(pp+nn)-1]; nn--;
- };
- s->mtfa[pp] = uc;
- } else {
- /* general case */
- lno = nn / MTFL_SIZE;
- off = nn % MTFL_SIZE;
- pp = s->mtfbase[lno] + off;
- uc = s->mtfa[pp];
- while (pp > s->mtfbase[lno]) {
- s->mtfa[pp] = s->mtfa[pp-1]; pp--;
- };
- s->mtfbase[lno]++;
- while (lno > 0) {
- s->mtfbase[lno]--;
- s->mtfa[s->mtfbase[lno]]
- = s->mtfa[s->mtfbase[lno-1] + MTFL_SIZE - 1];
- lno--;
- }
- s->mtfbase[0]--;
- s->mtfa[s->mtfbase[0]] = uc;
- if (s->mtfbase[0] == 0) {
- kk = MTFA_SIZE-1;
- for (ii = 256 / MTFL_SIZE-1; ii >= 0; ii--) {
- for (jj = MTFL_SIZE-1; jj >= 0; jj--) {
- s->mtfa[kk] = s->mtfa[s->mtfbase[ii] + jj];
- kk--;
- }
- s->mtfbase[ii] = kk + 1;
- }
- }
- }
- }
- /*-- end uc = MTF ( nextSym-1 ) --*/
-
- s->unzftab[s->seqToUnseq[uc]]++;
- if (s->smallDecompress)
- s->ll16[nblock] = (UInt16)(s->seqToUnseq[uc]); else
- s->tt[nblock] = (UInt32)(s->seqToUnseq[uc]);
- nblock++;
-
- GET_MTF_VAL(BZ_X_MTF_5, BZ_X_MTF_6, nextSym);
- continue;
- }
- }
-
- /* Now we know what nblock is, we can do a better sanity
- check on s->origPtr.
- */
- if (s->origPtr < 0 || s->origPtr >= nblock)
- RETURN(BZ_DATA_ERROR);
-
- s->state_out_len = 0;
- s->state_out_ch = 0;
- BZ_INITIALISE_CRC ( s->calculatedBlockCRC );
- s->state = BZ_X_OUTPUT;
- if (s->verbosity >= 2) VPrintf0 ( "rt+rld" );
-
- /*-- Set up cftab to facilitate generation of T^(-1) --*/
- s->cftab[0] = 0;
- for (i = 1; i <= 256; i++) s->cftab[i] = s->unzftab[i-1];
- for (i = 1; i <= 256; i++) s->cftab[i] += s->cftab[i-1];
-
- if (s->smallDecompress) {
-
- /*-- Make a copy of cftab, used in generation of T --*/
- for (i = 0; i <= 256; i++) s->cftabCopy[i] = s->cftab[i];
-
- /*-- compute the T vector --*/
- for (i = 0; i < nblock; i++) {
- uc = (UChar)(s->ll16[i]);
- SET_LL(i, s->cftabCopy[uc]);
- s->cftabCopy[uc]++;
- }
-
- /*-- Compute T^(-1) by pointer reversal on T --*/
- i = s->origPtr;
- j = GET_LL(i);
- do {
- Int32 tmp = GET_LL(j);
- SET_LL(j, i);
- i = j;
- j = tmp;
- }
- while (i != s->origPtr);
-
- s->tPos = s->origPtr;
- s->nblock_used = 0;
- if (s->blockRandomised) {
- BZ_RAND_INIT_MASK;
- BZ_GET_SMALL(s->k0); s->nblock_used++;
- BZ_RAND_UPD_MASK; s->k0 ^= BZ_RAND_MASK;
- } else {
- BZ_GET_SMALL(s->k0); s->nblock_used++;
- }
-
- } else {
-
- /*-- compute the T^(-1) vector --*/
- for (i = 0; i < nblock; i++) {
- uc = (UChar)(s->tt[i] & 0xff);
- s->tt[s->cftab[uc]] |= (i << 8);
- s->cftab[uc]++;
- }
-
- s->tPos = s->tt[s->origPtr] >> 8;
- s->nblock_used = 0;
- if (s->blockRandomised) {
- BZ_RAND_INIT_MASK;
- BZ_GET_FAST(s->k0); s->nblock_used++;
- BZ_RAND_UPD_MASK; s->k0 ^= BZ_RAND_MASK;
- } else {
- BZ_GET_FAST(s->k0); s->nblock_used++;
- }
-
- }
-
- RETURN(BZ_OK);
-
-
-
- endhdr_2:
-
- GET_UCHAR(BZ_X_ENDHDR_2, uc);
- if (uc != 0x72) RETURN(BZ_DATA_ERROR);
- GET_UCHAR(BZ_X_ENDHDR_3, uc);
- if (uc != 0x45) RETURN(BZ_DATA_ERROR);
- GET_UCHAR(BZ_X_ENDHDR_4, uc);
- if (uc != 0x38) RETURN(BZ_DATA_ERROR);
- GET_UCHAR(BZ_X_ENDHDR_5, uc);
- if (uc != 0x50) RETURN(BZ_DATA_ERROR);
- GET_UCHAR(BZ_X_ENDHDR_6, uc);
- if (uc != 0x90) RETURN(BZ_DATA_ERROR);
-
- s->storedCombinedCRC = 0;
- GET_UCHAR(BZ_X_CCRC_1, uc);
- s->storedCombinedCRC = (s->storedCombinedCRC << 8) | ((UInt32)uc);
- GET_UCHAR(BZ_X_CCRC_2, uc);
- s->storedCombinedCRC = (s->storedCombinedCRC << 8) | ((UInt32)uc);
- GET_UCHAR(BZ_X_CCRC_3, uc);
- s->storedCombinedCRC = (s->storedCombinedCRC << 8) | ((UInt32)uc);
- GET_UCHAR(BZ_X_CCRC_4, uc);
- s->storedCombinedCRC = (s->storedCombinedCRC << 8) | ((UInt32)uc);
-
- s->state = BZ_X_IDLE;
- RETURN(BZ_STREAM_END);
-
- default: AssertH ( False, 4001 );
- }
-
- AssertH ( False, 4002 );
-
- save_state_and_return:
-
- s->save_i = i;
- s->save_j = j;
- s->save_t = t;
- s->save_alphaSize = alphaSize;
- s->save_nGroups = nGroups;
- s->save_nSelectors = nSelectors;
- s->save_EOB = EOB;
- s->save_groupNo = groupNo;
- s->save_groupPos = groupPos;
- s->save_nextSym = nextSym;
- s->save_nblockMAX = nblockMAX;
- s->save_nblock = nblock;
- s->save_es = es;
- s->save_N = N;
- s->save_curr = curr;
- s->save_zt = zt;
- s->save_zn = zn;
- s->save_zvec = zvec;
- s->save_zj = zj;
- s->save_gSel = gSel;
- s->save_gMinlen = gMinlen;
- s->save_gLimit = gLimit;
- s->save_gBase = gBase;
- s->save_gPerm = gPerm;
-
- return retVal;
-}
-
-
-/*-------------------------------------------------------------*/
-/*--- end decompress.c ---*/
-/*-------------------------------------------------------------*/
+++ /dev/null
-/*\r
- minibz2\r
- libbz2.dll test program.\r
- by Yoshioka Tsuneo(QWF00133@nifty.ne.jp/tsuneo-y@is.aist-nara.ac.jp)\r
- This file is Public Domain.\r
- welcome any email to me.\r
-\r
- usage: minibz2 [-d] [-{1,2,..9}] [[srcfilename] destfilename]\r
-*/\r
-\r
-#define BZ_IMPORT\r
-#include <stdio.h>\r
-#include <stdlib.h>\r
-#include "bzlib.h"\r
-#ifdef _WIN32\r
-#include <io.h>\r
-#endif\r
-\r
-\r
-#ifdef _WIN32\r
-\r
-#define BZ2_LIBNAME "libbz2-1.0.0.DLL" \r
-\r
-#include <windows.h>\r
-static int BZ2DLLLoaded = 0;\r
-static HINSTANCE BZ2DLLhLib;\r
-int BZ2DLLLoadLibrary(void)\r
-{\r
- HINSTANCE hLib;\r
-\r
- if(BZ2DLLLoaded==1){return 0;}\r
- hLib=LoadLibrary(BZ2_LIBNAME);\r
- if(hLib == NULL){\r
- fprintf(stderr,"Can't load %s\n",BZ2_LIBNAME);\r
- return -1;\r
- }\r
- BZ2_bzlibVersion=GetProcAddress(hLib,"BZ2_bzlibVersion");\r
- BZ2_bzopen=GetProcAddress(hLib,"BZ2_bzopen");\r
- BZ2_bzdopen=GetProcAddress(hLib,"BZ2_bzdopen");\r
- BZ2_bzread=GetProcAddress(hLib,"BZ2_bzread");\r
- BZ2_bzwrite=GetProcAddress(hLib,"BZ2_bzwrite");\r
- BZ2_bzflush=GetProcAddress(hLib,"BZ2_bzflush");\r
- BZ2_bzclose=GetProcAddress(hLib,"BZ2_bzclose");\r
- BZ2_bzerror=GetProcAddress(hLib,"BZ2_bzerror");\r
-\r
- if (!BZ2_bzlibVersion || !BZ2_bzopen || !BZ2_bzdopen\r
- || !BZ2_bzread || !BZ2_bzwrite || !BZ2_bzflush\r
- || !BZ2_bzclose || !BZ2_bzerror) {\r
- fprintf(stderr,"GetProcAddress failed.\n");\r
- return -1;\r
- }\r
- BZ2DLLLoaded=1;\r
- BZ2DLLhLib=hLib;\r
- return 0;\r
-\r
-}\r
-int BZ2DLLFreeLibrary(void)\r
-{\r
- if(BZ2DLLLoaded==0){return 0;}\r
- FreeLibrary(BZ2DLLhLib);\r
- BZ2DLLLoaded=0;\r
-}\r
-#endif /* WIN32 */\r
-\r
-void usage(void)\r
-{\r
- puts("usage: minibz2 [-d] [-{1,2,..9}] [[srcfilename] destfilename]");\r
-}\r
-\r
-int main(int argc,char *argv[])\r
-{\r
- int decompress = 0;\r
- int level = 9;\r
- char *fn_r = NULL;\r
- char *fn_w = NULL;\r
-\r
-#ifdef _WIN32\r
- if(BZ2DLLLoadLibrary()<0){\r
- fprintf(stderr,"Loading of %s failed. Giving up.\n", BZ2_LIBNAME);\r
- exit(1);\r
- }\r
- printf("Loading of %s succeeded. Library version is %s.\n",\r
- BZ2_LIBNAME, BZ2_bzlibVersion() );\r
-#endif\r
- while(++argv,--argc){\r
- if(**argv =='-' || **argv=='/'){\r
- char *p;\r
-\r
- for(p=*argv+1;*p;p++){\r
- if(*p=='d'){\r
- decompress = 1;\r
- }else if('1'<=*p && *p<='9'){\r
- level = *p - '0';\r
- }else{\r
- usage();\r
- exit(1);\r
- }\r
- }\r
- }else{\r
- break;\r
- }\r
- }\r
- if(argc>=1){\r
- fn_r = *argv;\r
- argc--;argv++;\r
- }else{\r
- fn_r = NULL;\r
- }\r
- if(argc>=1){\r
- fn_w = *argv;\r
- argc--;argv++;\r
- }else{\r
- fn_w = NULL;\r
- }\r
- {\r
- int len;\r
- char buff[0x1000];\r
- char mode[10];\r
-\r
- if(decompress){\r
- BZFILE *BZ2fp_r = NULL;\r
- FILE *fp_w = NULL;\r
-\r
- if(fn_w){\r
- if((fp_w = fopen(fn_w,"wb"))==NULL){\r
- printf("can't open [%s]\n",fn_w);\r
- perror("reason:");\r
- exit(1);\r
- }\r
- }else{\r
- fp_w = stdout;\r
- }\r
- if((BZ2fp_r == NULL && (BZ2fp_r = BZ2_bzdopen(fileno(stdin),"rb"))==NULL)\r
- || (BZ2fp_r != NULL && (BZ2fp_r = BZ2_bzopen(fn_r,"rb"))==NULL)){\r
- printf("can't bz2openstream\n");\r
- exit(1);\r
- }\r
- while((len=BZ2_bzread(BZ2fp_r,buff,0x1000))>0){\r
- fwrite(buff,1,len,fp_w);\r
- }\r
- BZ2_bzclose(BZ2fp_r);\r
- if(fp_w != stdout) fclose(fp_w);\r
- }else{\r
- BZFILE *BZ2fp_w = NULL;\r
- FILE *fp_r = NULL;\r
-\r
- if(fn_r){\r
- if((fp_r = fopen(fn_r,"rb"))==NULL){\r
- printf("can't open [%s]\n",fn_r);\r
- perror("reason:");\r
- exit(1);\r
- }\r
- }else{\r
- fp_r = stdin;\r
- }\r
- mode[0]='w';\r
- mode[1] = '0' + level;\r
- mode[2] = '\0';\r
-\r
- if((fn_w == NULL && (BZ2fp_w = BZ2_bzdopen(fileno(stdout),mode))==NULL)\r
- || (fn_w !=NULL && (BZ2fp_w = BZ2_bzopen(fn_w,mode))==NULL)){\r
- printf("can't bz2openstream\n");\r
- exit(1);\r
- }\r
- while((len=fread(buff,1,0x1000,fp_r))>0){\r
- BZ2_bzwrite(BZ2fp_w,buff,len);\r
- }\r
- BZ2_bzclose(BZ2fp_w);\r
- if(fp_r!=stdin)fclose(fp_r);\r
- }\r
- }\r
-#ifdef _WIN32\r
- BZ2DLLFreeLibrary();\r
-#endif\r
- return 0;\r
-}\r
+++ /dev/null
-# Microsoft Developer Studio Project File - Name="dlltest" - Package Owner=<4>\r
-# Microsoft Developer Studio Generated Build File, Format Version 5.00\r
-# ** \95Ò\8fW\82µ\82È\82¢\82Å\82\82¾\82³\82¢ **\r
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-# TARGTYPE "Win32 (x86) Console Application" 0x0103\r
-\r
-CFG=dlltest - Win32 Debug\r
-!MESSAGE \82±\82ê\82Í\97L\8cø\82ÈÒ²¸Ì§²Ù\82Å\82Í\82 \82è\82Ü\82¹\82ñ\81B \82±\82ÌÌßÛ¼Þª¸Ä\82ðËÞÙÄÞ\82·\82é\82½\82ß\82É\82Í NMAKE \82ð\8eg\97p\82µ\82Ä\82\82¾\82³\82¢\81B\r
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-!MESSAGE \r
-!MESSAGE NMAKE /f "dlltest.mak" CFG="dlltest - Win32 Debug"\r
-!MESSAGE \r
-!MESSAGE \91I\91ð\89Â\94\\82ÈËÞÙÄÞ Ó°ÄÞ:\r
-!MESSAGE \r
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-!MESSAGE "dlltest - Win32 Debug" ("Win32 (x86) Console Application" \97p)\r
-!MESSAGE \r
-\r
-# Begin Project\r
-# PROP Scc_ProjName ""\r
-# PROP Scc_LocalPath ""\r
-CPP=cl.exe\r
-RSC=rc.exe\r
-\r
-!IF "$(CFG)" == "dlltest - Win32 Release"\r
-\r
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-# PROP BASE Use_Debug_Libraries 0\r
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-# ADD BASE CPP /nologo /W3 /GX /O2 /D "WIN32" /D "NDEBUG" /D "_CONSOLE" /D "_MBCS" /YX /FD /c\r
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-# ADD LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:console /machine:I386 /out:"minibz2.exe"\r
-\r
-!ELSEIF "$(CFG)" == "dlltest - Win32 Debug"\r
-\r
-# PROP BASE Use_MFC 0\r
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-# ADD LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:console /debug /machine:I386 /out:"minibz2.exe" /pdbtype:sept\r
-\r
-!ENDIF \r
-\r
-# Begin Target\r
-\r
-# Name "dlltest - Win32 Release"\r
-# Name "dlltest - Win32 Debug"\r
-# Begin Source File\r
-\r
-SOURCE=.\bzlib.h\r
-# End Source File\r
-# Begin Source File\r
-\r
-SOURCE=.\dlltest.c\r
-# End Source File\r
-# End Target\r
-# End Project\r
+++ /dev/null
-
-/*-------------------------------------------------------------*/
-/*--- Huffman coding low-level stuff ---*/
-/*--- huffman.c ---*/
-/*-------------------------------------------------------------*/
-
-/*--
- This file is a part of bzip2 and/or libbzip2, a program and
- library for lossless, block-sorting data compression.
-
- Copyright (C) 1996-2000 Julian R Seward. All rights reserved.
-
- Redistribution and use in source and binary forms, with or without
- modification, are permitted provided that the following conditions
- are met:
-
- 1. Redistributions of source code must retain the above copyright
- notice, this list of conditions and the following disclaimer.
-
- 2. The origin of this software must not be misrepresented; you must
- not claim that you wrote the original software. If you use this
- software in a product, an acknowledgment in the product
- documentation would be appreciated but is not required.
-
- 3. Altered source versions must be plainly marked as such, and must
- not be misrepresented as being the original software.
-
- 4. The name of the author may not be used to endorse or promote
- products derived from this software without specific prior written
- permission.
-
- THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
- OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
- DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
- GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
- Julian Seward, Cambridge, UK.
- jseward@acm.org
- bzip2/libbzip2 version 1.0 of 21 March 2000
-
- This program is based on (at least) the work of:
- Mike Burrows
- David Wheeler
- Peter Fenwick
- Alistair Moffat
- Radford Neal
- Ian H. Witten
- Robert Sedgewick
- Jon L. Bentley
-
- For more information on these sources, see the manual.
---*/
-
-
-#include "bzlib_private.h"
-
-/*---------------------------------------------------*/
-#define WEIGHTOF(zz0) ((zz0) & 0xffffff00)
-#define DEPTHOF(zz1) ((zz1) & 0x000000ff)
-#define MYMAX(zz2,zz3) ((zz2) > (zz3) ? (zz2) : (zz3))
-
-#define ADDWEIGHTS(zw1,zw2) \
- (WEIGHTOF(zw1)+WEIGHTOF(zw2)) | \
- (1 + MYMAX(DEPTHOF(zw1),DEPTHOF(zw2)))
-
-#define UPHEAP(z) \
-{ \
- Int32 zz, tmp; \
- zz = z; tmp = heap[zz]; \
- while (weight[tmp] < weight[heap[zz >> 1]]) { \
- heap[zz] = heap[zz >> 1]; \
- zz >>= 1; \
- } \
- heap[zz] = tmp; \
-}
-
-#define DOWNHEAP(z) \
-{ \
- Int32 zz, yy, tmp; \
- zz = z; tmp = heap[zz]; \
- while (True) { \
- yy = zz << 1; \
- if (yy > nHeap) break; \
- if (yy < nHeap && \
- weight[heap[yy+1]] < weight[heap[yy]]) \
- yy++; \
- if (weight[tmp] < weight[heap[yy]]) break; \
- heap[zz] = heap[yy]; \
- zz = yy; \
- } \
- heap[zz] = tmp; \
-}
-
-
-/*---------------------------------------------------*/
-void BZ2_hbMakeCodeLengths ( UChar *len,
- Int32 *freq,
- Int32 alphaSize,
- Int32 maxLen )
-{
- /*--
- Nodes and heap entries run from 1. Entry 0
- for both the heap and nodes is a sentinel.
- --*/
- Int32 nNodes, nHeap, n1, n2, i, j, k;
- Bool tooLong;
-
- Int32 heap [ BZ_MAX_ALPHA_SIZE + 2 ];
- Int32 weight [ BZ_MAX_ALPHA_SIZE * 2 ];
- Int32 parent [ BZ_MAX_ALPHA_SIZE * 2 ];
-
- for (i = 0; i < alphaSize; i++)
- weight[i+1] = (freq[i] == 0 ? 1 : freq[i]) << 8;
-
- while (True) {
-
- nNodes = alphaSize;
- nHeap = 0;
-
- heap[0] = 0;
- weight[0] = 0;
- parent[0] = -2;
-
- for (i = 1; i <= alphaSize; i++) {
- parent[i] = -1;
- nHeap++;
- heap[nHeap] = i;
- UPHEAP(nHeap);
- }
-
- AssertH( nHeap < (BZ_MAX_ALPHA_SIZE+2), 2001 );
-
- while (nHeap > 1) {
- n1 = heap[1]; heap[1] = heap[nHeap]; nHeap--; DOWNHEAP(1);
- n2 = heap[1]; heap[1] = heap[nHeap]; nHeap--; DOWNHEAP(1);
- nNodes++;
- parent[n1] = parent[n2] = nNodes;
- weight[nNodes] = ADDWEIGHTS(weight[n1], weight[n2]);
- parent[nNodes] = -1;
- nHeap++;
- heap[nHeap] = nNodes;
- UPHEAP(nHeap);
- }
-
- AssertH( nNodes < (BZ_MAX_ALPHA_SIZE * 2), 2002 );
-
- tooLong = False;
- for (i = 1; i <= alphaSize; i++) {
- j = 0;
- k = i;
- while (parent[k] >= 0) { k = parent[k]; j++; }
- len[i-1] = j;
- if (j > maxLen) tooLong = True;
- }
-
- if (! tooLong) break;
-
- for (i = 1; i < alphaSize; i++) {
- j = weight[i] >> 8;
- j = 1 + (j / 2);
- weight[i] = j << 8;
- }
- }
-}
-
-
-/*---------------------------------------------------*/
-void BZ2_hbAssignCodes ( Int32 *code,
- UChar *length,
- Int32 minLen,
- Int32 maxLen,
- Int32 alphaSize )
-{
- Int32 n, vec, i;
-
- vec = 0;
- for (n = minLen; n <= maxLen; n++) {
- for (i = 0; i < alphaSize; i++)
- if (length[i] == n) { code[i] = vec; vec++; };
- vec <<= 1;
- }
-}
-
-
-/*---------------------------------------------------*/
-void BZ2_hbCreateDecodeTables ( Int32 *limit,
- Int32 *base,
- Int32 *perm,
- UChar *length,
- Int32 minLen,
- Int32 maxLen,
- Int32 alphaSize )
-{
- Int32 pp, i, j, vec;
-
- pp = 0;
- for (i = minLen; i <= maxLen; i++)
- for (j = 0; j < alphaSize; j++)
- if (length[j] == i) { perm[pp] = j; pp++; };
-
- for (i = 0; i < BZ_MAX_CODE_LEN; i++) base[i] = 0;
- for (i = 0; i < alphaSize; i++) base[length[i]+1]++;
-
- for (i = 1; i < BZ_MAX_CODE_LEN; i++) base[i] += base[i-1];
-
- for (i = 0; i < BZ_MAX_CODE_LEN; i++) limit[i] = 0;
- vec = 0;
-
- for (i = minLen; i <= maxLen; i++) {
- vec += (base[i+1] - base[i]);
- limit[i] = vec-1;
- vec <<= 1;
- }
- for (i = minLen + 1; i <= maxLen; i++)
- base[i] = ((limit[i-1] + 1) << 1) - base[i];
-}
-
-
-/*-------------------------------------------------------------*/
-/*--- end huffman.c ---*/
-/*-------------------------------------------------------------*/
+++ /dev/null
-LIBRARY LIBBZ2\r
-DESCRIPTION "libbzip2: library for data compression"\r
-EXPORTS\r
- BZ2_bzCompressInit\r
- BZ2_bzCompress\r
- BZ2_bzCompressEnd\r
- BZ2_bzDecompressInit\r
- BZ2_bzDecompress\r
- BZ2_bzDecompressEnd\r
- BZ2_bzReadOpen\r
- BZ2_bzReadClose\r
- BZ2_bzReadGetUnused\r
- BZ2_bzRead\r
- BZ2_bzWriteOpen\r
- BZ2_bzWrite\r
- BZ2_bzWriteClose\r
- BZ2_bzWriteClose64\r
- BZ2_bzBuffToBuffCompress\r
- BZ2_bzBuffToBuffDecompress\r
- BZ2_bzlibVersion\r
- BZ2_bzopen\r
- BZ2_bzdopen\r
- BZ2_bzread\r
- BZ2_bzwrite\r
- BZ2_bzflush\r
- BZ2_bzclose\r
- BZ2_bzerror\r
+++ /dev/null
-# Microsoft Developer Studio Project File - Name="libbz2" - Package Owner=<4>\r
-# Microsoft Developer Studio Generated Build File, Format Version 5.00\r
-# ** \95Ò\8fW\82µ\82È\82¢\82Å\82\82¾\82³\82¢ **\r
-\r
-# TARGTYPE "Win32 (x86) Dynamic-Link Library" 0x0102\r
-\r
-CFG=libbz2 - Win32 Debug\r
-!MESSAGE \82±\82ê\82Í\97L\8cø\82ÈÒ²¸Ì§²Ù\82Å\82Í\82 \82è\82Ü\82¹\82ñ\81B \82±\82ÌÌßÛ¼Þª¸Ä\82ðËÞÙÄÞ\82·\82é\82½\82ß\82É\82Í NMAKE \82ð\8eg\97p\82µ\82Ä\82\82¾\82³\82¢\81B\r
-!MESSAGE [Ò²¸Ì§²Ù\82Ì´¸½Îß°Ä] ºÏÝÄÞ\82ð\8eg\97p\82µ\82Ä\8eÀ\8ds\82µ\82Ä\82\82¾\82³\82¢\r
-!MESSAGE \r
-!MESSAGE NMAKE /f "libbz2.mak".\r
-!MESSAGE \r
-!MESSAGE NMAKE \82Ì\8eÀ\8ds\8e\9e\82É\8d\\90¬\82ð\8ew\92è\82Å\82«\82Ü\82·\r
-!MESSAGE ºÏÝÄÞ ×²Ý\8fã\82ÅϸÛ\82Ì\90Ý\92è\82ð\92è\8b`\82µ\82Ü\82·\81B\97á:\r
-!MESSAGE \r
-!MESSAGE NMAKE /f "libbz2.mak" CFG="libbz2 - Win32 Debug"\r
-!MESSAGE \r
-!MESSAGE \91I\91ð\89Â\94\\82ÈËÞÙÄÞ Ó°ÄÞ:\r
-!MESSAGE \r
-!MESSAGE "libbz2 - Win32 Release" ("Win32 (x86) Dynamic-Link Library" \97p)\r
-!MESSAGE "libbz2 - Win32 Debug" ("Win32 (x86) Dynamic-Link Library" \97p)\r
-!MESSAGE \r
-\r
-# Begin Project\r
-# PROP Scc_ProjName ""\r
-# PROP Scc_LocalPath ""\r
-CPP=cl.exe\r
-MTL=midl.exe\r
-RSC=rc.exe\r
-\r
-!IF "$(CFG)" == "libbz2 - Win32 Release"\r
-\r
-# PROP BASE Use_MFC 0\r
-# PROP BASE Use_Debug_Libraries 0\r
-# PROP BASE Output_Dir "Release"\r
-# PROP BASE Intermediate_Dir "Release"\r
-# PROP BASE Target_Dir ""\r
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-# ADD BASE MTL /nologo /D "NDEBUG" /mktyplib203 /o NUL /win32\r
-# ADD MTL /nologo /D "NDEBUG" /mktyplib203 /o NUL /win32\r
-# ADD BASE RSC /l 0x411 /d "NDEBUG"\r
-# ADD RSC /l 0x411 /d "NDEBUG"\r
-BSC32=bscmake.exe\r
-# ADD BASE BSC32 /nologo\r
-# ADD BSC32 /nologo\r
-LINK32=link.exe\r
-# ADD BASE LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:windows /dll /machine:I386\r
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-!ELSEIF "$(CFG)" == "libbz2 - Win32 Debug"\r
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-# PROP BASE Use_MFC 0\r
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-\r
-!ENDIF \r
-\r
-# Begin Target\r
-\r
-# Name "libbz2 - Win32 Release"\r
-# Name "libbz2 - Win32 Debug"\r
-# Begin Source File\r
-\r
-SOURCE=.\blocksort.c\r
-# End Source File\r
-# Begin Source File\r
-\r
-SOURCE=.\bzlib.c\r
-# End Source File\r
-# Begin Source File\r
-\r
-SOURCE=.\bzlib.h\r
-# End Source File\r
-# Begin Source File\r
-\r
-SOURCE=.\bzlib_private.h\r
-# End Source File\r
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-SOURCE=.\compress.c\r
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-\r
-SOURCE=.\huffman.c\r
-# End Source File\r
-# Begin Source File\r
-\r
-SOURCE=.\libbz2.def\r
-# End Source File\r
-# Begin Source File\r
-\r
-SOURCE=.\randtable.c\r
-# End Source File\r
-# End Target\r
-# End Project\r
+++ /dev/null
-# Makefile for Microsoft Visual C++ 6.0\r
-# usage: nmake -f makefile.msc\r
-# K.M. Syring (syring@gsf.de)\r
-# Fixed up by JRS for bzip2-0.9.5d release.\r
-\r
-CC=cl\r
-CFLAGS= -DWIN32 -MD -Ox -D_FILE_OFFSET_BITS=64\r
-\r
-OBJS= blocksort.obj \\r
- huffman.obj \\r
- crctable.obj \\r
- randtable.obj \\r
- compress.obj \\r
- decompress.obj \\r
- bzlib.obj\r
-\r
-all: lib bzip2 test\r
-\r
-bzip2: lib\r
- $(CC) $(CFLAGS) -o bzip2 bzip2.c libbz2.lib setargv.obj\r
- $(CC) $(CFLAGS) -o bzip2recover bzip2recover.c\r
-\r
-lib: $(OBJS)\r
- lib /out:libbz2.lib $(OBJS)\r
-\r
-test: bzip2\r
- type words1\r
- .\\bzip2 -1 < sample1.ref > sample1.rb2\r
- .\\bzip2 -2 < sample2.ref > sample2.rb2\r
- .\\bzip2 -3 < sample3.ref > sample3.rb2\r
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- .\\bzip2 -d < sample2.bz2 > sample2.tst\r
- .\\bzip2 -ds < sample3.bz2 > sample3.tst\r
- @echo All six of the fc's should find no differences.\r
- @echo If fc finds an error on sample3.bz2, this could be\r
- @echo because WinZip's 'TAR file smart CR/LF conversion'\r
- @echo is too clever for its own good. Disable this option.\r
- @echo The correct size for sample3.ref is 120,244. If it\r
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- fc sample1.bz2 sample1.rb2 \r
- fc sample2.bz2 sample2.rb2\r
- fc sample3.bz2 sample3.rb2\r
- fc sample1.tst sample1.ref\r
- fc sample2.tst sample2.ref\r
- fc sample3.tst sample3.ref\r
-\r
-\r
-\r
-clean: \r
- del *.obj\r
- del libbz2.lib \r
- del bzip2.exe\r
- del bzip2recover.exe\r
- del sample1.rb2 \r
- del sample2.rb2 \r
- del sample3.rb2\r
- del sample1.tst \r
- del sample2.tst\r
- del sample3.tst\r
-\r
-.c.obj: \r
- $(CC) $(CFLAGS) -c $*.c -o $*.obj\r
-\r
+++ /dev/null
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-2304 y(remaining)j(input,)i(compress)f(it)g(and)g(terminate)h(the)g
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-b Fl(35)p eop
-%%Trailer
-end
-userdict /end-hook known{end-hook}if
-%%EOF
+++ /dev/null
-\input texinfo @c -*- Texinfo -*-
-@setfilename bzip2.info
-
-@ignore
-This file documents bzip2 version 1.0, and associated library
-libbzip2, written by Julian Seward (jseward@acm.org).
-
-Copyright (C) 1996-2000 Julian R Seward
-
-Permission is granted to make and distribute verbatim copies of
-this manual provided the copyright notice and this permission notice
-are preserved on all copies.
-
-Permission is granted to copy and distribute translations of this manual
-into another language, under the above conditions for verbatim copies.
-@end ignore
-
-@ifinfo
-@format
-START-INFO-DIR-ENTRY
-* Bzip2: (bzip2). A program and library for data compression.
-END-INFO-DIR-ENTRY
-@end format
-
-@end ifinfo
-
-@iftex
-@c @finalout
-@settitle bzip2 and libbzip2
-@titlepage
-@title bzip2 and libbzip2
-@subtitle a program and library for data compression
-@subtitle copyright (C) 1996-2000 Julian Seward
-@subtitle version 1.0 of 21 March 2000
-@author Julian Seward
-
-@end titlepage
-
-@parindent 0mm
-@parskip 2mm
-
-@end iftex
-@node Top, Overview, (dir), (dir)
-
-This program, @code{bzip2},
-and associated library @code{libbzip2}, are
-Copyright (C) 1996-2000 Julian R Seward. All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions
-are met:
-@itemize @bullet
-@item
- Redistributions of source code must retain the above copyright
- notice, this list of conditions and the following disclaimer.
-@item
- The origin of this software must not be misrepresented; you must
- not claim that you wrote the original software. If you use this
- software in a product, an acknowledgment in the product
- documentation would be appreciated but is not required.
-@item
- Altered source versions must be plainly marked as such, and must
- not be misrepresented as being the original software.
-@item
- The name of the author may not be used to endorse or promote
- products derived from this software without specific prior written
- permission.
-@end itemize
-THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
-OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
-DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
-GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
-WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
-NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-Julian Seward, Cambridge, UK.
-
-@code{jseward@@acm.org}
-
-@code{http://sourceware.cygnus.com/bzip2}
-
-@code{http://www.cacheprof.org}
-
-@code{http://www.muraroa.demon.co.uk}
-
-@code{bzip2}/@code{libbzip2} version 1.0 of 21 March 2000.
-
-PATENTS: To the best of my knowledge, @code{bzip2} does not use any patented
-algorithms. However, I do not have the resources available to carry out
-a full patent search. Therefore I cannot give any guarantee of the
-above statement.
-
-
-
-
-
-
-
-@node Overview, Implementation, Top, Top
-@chapter Introduction
-
-@code{bzip2} compresses files using the Burrows-Wheeler
-block-sorting text compression algorithm, and Huffman coding.
-Compression is generally considerably better than that
-achieved by more conventional LZ77/LZ78-based compressors,
-and approaches the performance of the PPM family of statistical compressors.
-
-@code{bzip2} is built on top of @code{libbzip2}, a flexible library
-for handling compressed data in the @code{bzip2} format. This manual
-describes both how to use the program and
-how to work with the library interface. Most of the
-manual is devoted to this library, not the program,
-which is good news if your interest is only in the program.
-
-Chapter 2 describes how to use @code{bzip2}; this is the only part
-you need to read if you just want to know how to operate the program.
-Chapter 3 describes the programming interfaces in detail, and
-Chapter 4 records some miscellaneous notes which I thought
-ought to be recorded somewhere.
-
-
-@chapter How to use @code{bzip2}
-
-This chapter contains a copy of the @code{bzip2} man page,
-and nothing else.
-
-@quotation
-
-@unnumberedsubsubsec NAME
-@itemize
-@item @code{bzip2}, @code{bunzip2}
-- a block-sorting file compressor, v1.0
-@item @code{bzcat}
-- decompresses files to stdout
-@item @code{bzip2recover}
-- recovers data from damaged bzip2 files
-@end itemize
-
-@unnumberedsubsubsec SYNOPSIS
-@itemize
-@item @code{bzip2} [ -cdfkqstvzVL123456789 ] [ filenames ... ]
-@item @code{bunzip2} [ -fkvsVL ] [ filenames ... ]
-@item @code{bzcat} [ -s ] [ filenames ... ]
-@item @code{bzip2recover} filename
-@end itemize
-
-@unnumberedsubsubsec DESCRIPTION
-
-@code{bzip2} compresses files using the Burrows-Wheeler block sorting
-text compression algorithm, and Huffman coding. Compression is
-generally considerably better than that achieved by more conventional
-LZ77/LZ78-based compressors, and approaches the performance of the PPM
-family of statistical compressors.
-
-The command-line options are deliberately very similar to those of GNU
-@code{gzip}, but they are not identical.
-
-@code{bzip2} expects a list of file names to accompany the command-line
-flags. Each file is replaced by a compressed version of itself, with
-the name @code{original_name.bz2}. Each compressed file has the same
-modification date, permissions, and, when possible, ownership as the
-corresponding original, so that these properties can be correctly
-restored at decompression time. File name handling is naive in the
-sense that there is no mechanism for preserving original file names,
-permissions, ownerships or dates in filesystems which lack these
-concepts, or have serious file name length restrictions, such as MS-DOS.
-
-@code{bzip2} and @code{bunzip2} will by default not overwrite existing
-files. If you want this to happen, specify the @code{-f} flag.
-
-If no file names are specified, @code{bzip2} compresses from standard
-input to standard output. In this case, @code{bzip2} will decline to
-write compressed output to a terminal, as this would be entirely
-incomprehensible and therefore pointless.
-
-@code{bunzip2} (or @code{bzip2 -d}) decompresses all
-specified files. Files which were not created by @code{bzip2}
-will be detected and ignored, and a warning issued.
-@code{bzip2} attempts to guess the filename for the decompressed file
-from that of the compressed file as follows:
-@itemize
-@item @code{filename.bz2 } becomes @code{filename}
-@item @code{filename.bz } becomes @code{filename}
-@item @code{filename.tbz2} becomes @code{filename.tar}
-@item @code{filename.tbz } becomes @code{filename.tar}
-@item @code{anyothername } becomes @code{anyothername.out}
-@end itemize
-If the file does not end in one of the recognised endings,
-@code{.bz2}, @code{.bz},
-@code{.tbz2} or @code{.tbz}, @code{bzip2} complains that it cannot
-guess the name of the original file, and uses the original name
-with @code{.out} appended.
-
-As with compression, supplying no
-filenames causes decompression from standard input to standard output.
-
-@code{bunzip2} will correctly decompress a file which is the
-concatenation of two or more compressed files. The result is the
-concatenation of the corresponding uncompressed files. Integrity
-testing (@code{-t}) of concatenated compressed files is also supported.
-
-You can also compress or decompress files to the standard output by
-giving the @code{-c} flag. Multiple files may be compressed and
-decompressed like this. The resulting outputs are fed sequentially to
-stdout. Compression of multiple files in this manner generates a stream
-containing multiple compressed file representations. Such a stream
-can be decompressed correctly only by @code{bzip2} version 0.9.0 or
-later. Earlier versions of @code{bzip2} will stop after decompressing
-the first file in the stream.
-
-@code{bzcat} (or @code{bzip2 -dc}) decompresses all specified files to
-the standard output.
-
-@code{bzip2} will read arguments from the environment variables
-@code{BZIP2} and @code{BZIP}, in that order, and will process them
-before any arguments read from the command line. This gives a
-convenient way to supply default arguments.
-
-Compression is always performed, even if the compressed file is slightly
-larger than the original. Files of less than about one hundred bytes
-tend to get larger, since the compression mechanism has a constant
-overhead in the region of 50 bytes. Random data (including the output
-of most file compressors) is coded at about 8.05 bits per byte, giving
-an expansion of around 0.5%.
-
-As a self-check for your protection, @code{bzip2} uses 32-bit CRCs to
-make sure that the decompressed version of a file is identical to the
-original. This guards against corruption of the compressed data, and
-against undetected bugs in @code{bzip2} (hopefully very unlikely). The
-chances of data corruption going undetected is microscopic, about one
-chance in four billion for each file processed. Be aware, though, that
-the check occurs upon decompression, so it can only tell you that
-something is wrong. It can't help you recover the original uncompressed
-data. You can use @code{bzip2recover} to try to recover data from
-damaged files.
-
-Return values: 0 for a normal exit, 1 for environmental problems (file
-not found, invalid flags, I/O errors, &c), 2 to indicate a corrupt
-compressed file, 3 for an internal consistency error (eg, bug) which
-caused @code{bzip2} to panic.
-
-
-@unnumberedsubsubsec OPTIONS
-@table @code
-@item -c --stdout
-Compress or decompress to standard output.
-@item -d --decompress
-Force decompression. @code{bzip2}, @code{bunzip2} and @code{bzcat} are
-really the same program, and the decision about what actions to take is
-done on the basis of which name is used. This flag overrides that
-mechanism, and forces bzip2 to decompress.
-@item -z --compress
-The complement to @code{-d}: forces compression, regardless of the
-invokation name.
-@item -t --test
-Check integrity of the specified file(s), but don't decompress them.
-This really performs a trial decompression and throws away the result.
-@item -f --force
-Force overwrite of output files. Normally, @code{bzip2} will not overwrite
-existing output files. Also forces @code{bzip2} to break hard links
-to files, which it otherwise wouldn't do.
-@item -k --keep
-Keep (don't delete) input files during compression
-or decompression.
-@item -s --small
-Reduce memory usage, for compression, decompression and testing. Files
-are decompressed and tested using a modified algorithm which only
-requires 2.5 bytes per block byte. This means any file can be
-decompressed in 2300k of memory, albeit at about half the normal speed.
-
-During compression, @code{-s} selects a block size of 200k, which limits
-memory use to around the same figure, at the expense of your compression
-ratio. In short, if your machine is low on memory (8 megabytes or
-less), use -s for everything. See MEMORY MANAGEMENT below.
-@item -q --quiet
-Suppress non-essential warning messages. Messages pertaining to
-I/O errors and other critical events will not be suppressed.
-@item -v --verbose
-Verbose mode -- show the compression ratio for each file processed.
-Further @code{-v}'s increase the verbosity level, spewing out lots of
-information which is primarily of interest for diagnostic purposes.
-@item -L --license -V --version
-Display the software version, license terms and conditions.
-@item -1 to -9
-Set the block size to 100 k, 200 k .. 900 k when compressing. Has no
-effect when decompressing. See MEMORY MANAGEMENT below.
-@item --
-Treats all subsequent arguments as file names, even if they start
-with a dash. This is so you can handle files with names beginning
-with a dash, for example: @code{bzip2 -- -myfilename}.
-@item --repetitive-fast
-@item --repetitive-best
-These flags are redundant in versions 0.9.5 and above. They provided
-some coarse control over the behaviour of the sorting algorithm in
-earlier versions, which was sometimes useful. 0.9.5 and above have an
-improved algorithm which renders these flags irrelevant.
-@end table
-
-
-@unnumberedsubsubsec MEMORY MANAGEMENT
-
-@code{bzip2} compresses large files in blocks. The block size affects
-both the compression ratio achieved, and the amount of memory needed for
-compression and decompression. The flags @code{-1} through @code{-9}
-specify the block size to be 100,000 bytes through 900,000 bytes (the
-default) respectively. At decompression time, the block size used for
-compression is read from the header of the compressed file, and
-@code{bunzip2} then allocates itself just enough memory to decompress
-the file. Since block sizes are stored in compressed files, it follows
-that the flags @code{-1} to @code{-9} are irrelevant to and so ignored
-during decompression.
-
-Compression and decompression requirements, in bytes, can be estimated
-as:
-@example
- Compression: 400k + ( 8 x block size )
-
- Decompression: 100k + ( 4 x block size ), or
- 100k + ( 2.5 x block size )
-@end example
-Larger block sizes give rapidly diminishing marginal returns. Most of
-the compression comes from the first two or three hundred k of block
-size, a fact worth bearing in mind when using @code{bzip2} on small machines.
-It is also important to appreciate that the decompression memory
-requirement is set at compression time by the choice of block size.
-
-For files compressed with the default 900k block size, @code{bunzip2}
-will require about 3700 kbytes to decompress. To support decompression
-of any file on a 4 megabyte machine, @code{bunzip2} has an option to
-decompress using approximately half this amount of memory, about 2300
-kbytes. Decompression speed is also halved, so you should use this
-option only where necessary. The relevant flag is @code{-s}.
-
-In general, try and use the largest block size memory constraints allow,
-since that maximises the compression achieved. Compression and
-decompression speed are virtually unaffected by block size.
-
-Another significant point applies to files which fit in a single block
--- that means most files you'd encounter using a large block size. The
-amount of real memory touched is proportional to the size of the file,
-since the file is smaller than a block. For example, compressing a file
-20,000 bytes long with the flag @code{-9} will cause the compressor to
-allocate around 7600k of memory, but only touch 400k + 20000 * 8 = 560
-kbytes of it. Similarly, the decompressor will allocate 3700k but only
-touch 100k + 20000 * 4 = 180 kbytes.
-
-Here is a table which summarises the maximum memory usage for different
-block sizes. Also recorded is the total compressed size for 14 files of
-the Calgary Text Compression Corpus totalling 3,141,622 bytes. This
-column gives some feel for how compression varies with block size.
-These figures tend to understate the advantage of larger block sizes for
-larger files, since the Corpus is dominated by smaller files.
-@example
- Compress Decompress Decompress Corpus
- Flag usage usage -s usage Size
-
- -1 1200k 500k 350k 914704
- -2 2000k 900k 600k 877703
- -3 2800k 1300k 850k 860338
- -4 3600k 1700k 1100k 846899
- -5 4400k 2100k 1350k 845160
- -6 5200k 2500k 1600k 838626
- -7 6100k 2900k 1850k 834096
- -8 6800k 3300k 2100k 828642
- -9 7600k 3700k 2350k 828642
-@end example
-
-@unnumberedsubsubsec RECOVERING DATA FROM DAMAGED FILES
-
-@code{bzip2} compresses files in blocks, usually 900kbytes long. Each
-block is handled independently. If a media or transmission error causes
-a multi-block @code{.bz2} file to become damaged, it may be possible to
-recover data from the undamaged blocks in the file.
-
-The compressed representation of each block is delimited by a 48-bit
-pattern, which makes it possible to find the block boundaries with
-reasonable certainty. Each block also carries its own 32-bit CRC, so
-damaged blocks can be distinguished from undamaged ones.
-
-@code{bzip2recover} is a simple program whose purpose is to search for
-blocks in @code{.bz2} files, and write each block out into its own
-@code{.bz2} file. You can then use @code{bzip2 -t} to test the
-integrity of the resulting files, and decompress those which are
-undamaged.
-
-@code{bzip2recover}
-takes a single argument, the name of the damaged file,
-and writes a number of files @code{rec0001file.bz2},
- @code{rec0002file.bz2}, etc, containing the extracted blocks.
- The output filenames are designed so that the use of
- wildcards in subsequent processing -- for example,
-@code{bzip2 -dc rec*file.bz2 > recovered_data} -- lists the files in
- the correct order.
-
-@code{bzip2recover} should be of most use dealing with large @code{.bz2}
- files, as these will contain many blocks. It is clearly
- futile to use it on damaged single-block files, since a
- damaged block cannot be recovered. If you wish to minimise
-any potential data loss through media or transmission errors,
-you might consider compressing with a smaller
- block size.
-
-
-@unnumberedsubsubsec PERFORMANCE NOTES
-
-The sorting phase of compression gathers together similar strings in the
-file. Because of this, files containing very long runs of repeated
-symbols, like "aabaabaabaab ..." (repeated several hundred times) may
-compress more slowly than normal. Versions 0.9.5 and above fare much
-better than previous versions in this respect. The ratio between
-worst-case and average-case compression time is in the region of 10:1.
-For previous versions, this figure was more like 100:1. You can use the
-@code{-vvvv} option to monitor progress in great detail, if you want.
-
-Decompression speed is unaffected by these phenomena.
-
-@code{bzip2} usually allocates several megabytes of memory to operate
-in, and then charges all over it in a fairly random fashion. This means
-that performance, both for compressing and decompressing, is largely
-determined by the speed at which your machine can service cache misses.
-Because of this, small changes to the code to reduce the miss rate have
-been observed to give disproportionately large performance improvements.
-I imagine @code{bzip2} will perform best on machines with very large
-caches.
-
-
-@unnumberedsubsubsec CAVEATS
-
-I/O error messages are not as helpful as they could be. @code{bzip2}
-tries hard to detect I/O errors and exit cleanly, but the details of
-what the problem is sometimes seem rather misleading.
-
-This manual page pertains to version 1.0 of @code{bzip2}. Compressed
-data created by this version is entirely forwards and backwards
-compatible with the previous public releases, versions 0.1pl2, 0.9.0 and
-0.9.5, but with the following exception: 0.9.0 and above can correctly
-decompress multiple concatenated compressed files. 0.1pl2 cannot do
-this; it will stop after decompressing just the first file in the
-stream.
-
-@code{bzip2recover} uses 32-bit integers to represent bit positions in
-compressed files, so it cannot handle compressed files more than 512
-megabytes long. This could easily be fixed.
-
-
-@unnumberedsubsubsec AUTHOR
-Julian Seward, @code{jseward@@acm.org}.
-
-The ideas embodied in @code{bzip2} are due to (at least) the following
-people: Michael Burrows and David Wheeler (for the block sorting
-transformation), David Wheeler (again, for the Huffman coder), Peter
-Fenwick (for the structured coding model in the original @code{bzip},
-and many refinements), and Alistair Moffat, Radford Neal and Ian Witten
-(for the arithmetic coder in the original @code{bzip}). I am much
-indebted for their help, support and advice. See the manual in the
-source distribution for pointers to sources of documentation. Christian
-von Roques encouraged me to look for faster sorting algorithms, so as to
-speed up compression. Bela Lubkin encouraged me to improve the
-worst-case compression performance. Many people sent patches, helped
-with portability problems, lent machines, gave advice and were generally
-helpful.
-
-@end quotation
-
-
-
-
-@chapter Programming with @code{libbzip2}
-
-This chapter describes the programming interface to @code{libbzip2}.
-
-For general background information, particularly about memory
-use and performance aspects, you'd be well advised to read Chapter 2
-as well.
-
-@section Top-level structure
-
-@code{libbzip2} is a flexible library for compressing and decompressing
-data in the @code{bzip2} data format. Although packaged as a single
-entity, it helps to regard the library as three separate parts: the low
-level interface, and the high level interface, and some utility
-functions.
-
-The structure of @code{libbzip2}'s interfaces is similar to
-that of Jean-loup Gailly's and Mark Adler's excellent @code{zlib}
-library.
-
-All externally visible symbols have names beginning @code{BZ2_}.
-This is new in version 1.0. The intention is to minimise pollution
-of the namespaces of library clients.
-
-@subsection Low-level summary
-
-This interface provides services for compressing and decompressing
-data in memory. There's no provision for dealing with files, streams
-or any other I/O mechanisms, just straight memory-to-memory work.
-In fact, this part of the library can be compiled without inclusion
-of @code{stdio.h}, which may be helpful for embedded applications.
-
-The low-level part of the library has no global variables and
-is therefore thread-safe.
-
-Six routines make up the low level interface:
-@code{BZ2_bzCompressInit}, @code{BZ2_bzCompress}, and @* @code{BZ2_bzCompressEnd}
-for compression,
-and a corresponding trio @code{BZ2_bzDecompressInit}, @* @code{BZ2_bzDecompress}
-and @code{BZ2_bzDecompressEnd} for decompression.
-The @code{*Init} functions allocate
-memory for compression/decompression and do other
-initialisations, whilst the @code{*End} functions close down operations
-and release memory.
-
-The real work is done by @code{BZ2_bzCompress} and @code{BZ2_bzDecompress}.
-These compress and decompress data from a user-supplied input buffer
-to a user-supplied output buffer. These buffers can be any size;
-arbitrary quantities of data are handled by making repeated calls
-to these functions. This is a flexible mechanism allowing a
-consumer-pull style of activity, or producer-push, or a mixture of
-both.
-
-
-
-@subsection High-level summary
-
-This interface provides some handy wrappers around the low-level
-interface to facilitate reading and writing @code{bzip2} format
-files (@code{.bz2} files). The routines provide hooks to facilitate
-reading files in which the @code{bzip2} data stream is embedded
-within some larger-scale file structure, or where there are
-multiple @code{bzip2} data streams concatenated end-to-end.
-
-For reading files, @code{BZ2_bzReadOpen}, @code{BZ2_bzRead},
-@code{BZ2_bzReadClose} and @* @code{BZ2_bzReadGetUnused} are supplied. For
-writing files, @code{BZ2_bzWriteOpen}, @code{BZ2_bzWrite} and
-@code{BZ2_bzWriteFinish} are available.
-
-As with the low-level library, no global variables are used
-so the library is per se thread-safe. However, if I/O errors
-occur whilst reading or writing the underlying compressed files,
-you may have to consult @code{errno} to determine the cause of
-the error. In that case, you'd need a C library which correctly
-supports @code{errno} in a multithreaded environment.
-
-To make the library a little simpler and more portable,
-@code{BZ2_bzReadOpen} and @code{BZ2_bzWriteOpen} require you to pass them file
-handles (@code{FILE*}s) which have previously been opened for reading or
-writing respectively. That avoids portability problems associated with
-file operations and file attributes, whilst not being much of an
-imposition on the programmer.
-
-
-
-@subsection Utility functions summary
-For very simple needs, @code{BZ2_bzBuffToBuffCompress} and
-@code{BZ2_bzBuffToBuffDecompress} are provided. These compress
-data in memory from one buffer to another buffer in a single
-function call. You should assess whether these functions
-fulfill your memory-to-memory compression/decompression
-requirements before investing effort in understanding the more
-general but more complex low-level interface.
-
-Yoshioka Tsuneo (@code{QWF00133@@niftyserve.or.jp} /
-@code{tsuneo-y@@is.aist-nara.ac.jp}) has contributed some functions to
-give better @code{zlib} compatibility. These functions are
-@code{BZ2_bzopen}, @code{BZ2_bzread}, @code{BZ2_bzwrite}, @code{BZ2_bzflush},
-@code{BZ2_bzclose},
-@code{BZ2_bzerror} and @code{BZ2_bzlibVersion}. You may find these functions
-more convenient for simple file reading and writing, than those in the
-high-level interface. These functions are not (yet) officially part of
-the library, and are minimally documented here. If they break, you
-get to keep all the pieces. I hope to document them properly when time
-permits.
-
-Yoshioka also contributed modifications to allow the library to be
-built as a Windows DLL.
-
-
-@section Error handling
-
-The library is designed to recover cleanly in all situations, including
-the worst-case situation of decompressing random data. I'm not
-100% sure that it can always do this, so you might want to add
-a signal handler to catch segmentation violations during decompression
-if you are feeling especially paranoid. I would be interested in
-hearing more about the robustness of the library to corrupted
-compressed data.
-
-Version 1.0 is much more robust in this respect than
-0.9.0 or 0.9.5. Investigations with Checker (a tool for
-detecting problems with memory management, similar to Purify)
-indicate that, at least for the few files I tested, all single-bit
-errors in the decompressed data are caught properly, with no
-segmentation faults, no reads of uninitialised data and no
-out of range reads or writes. So it's certainly much improved,
-although I wouldn't claim it to be totally bombproof.
-
-The file @code{bzlib.h} contains all definitions needed to use
-the library. In particular, you should definitely not include
-@code{bzlib_private.h}.
-
-In @code{bzlib.h}, the various return values are defined. The following
-list is not intended as an exhaustive description of the circumstances
-in which a given value may be returned -- those descriptions are given
-later. Rather, it is intended to convey the rough meaning of each
-return value. The first five actions are normal and not intended to
-denote an error situation.
-@table @code
-@item BZ_OK
-The requested action was completed successfully.
-@item BZ_RUN_OK
-@itemx BZ_FLUSH_OK
-@itemx BZ_FINISH_OK
-In @code{BZ2_bzCompress}, the requested flush/finish/nothing-special action
-was completed successfully.
-@item BZ_STREAM_END
-Compression of data was completed, or the logical stream end was
-detected during decompression.
-@end table
-
-The following return values indicate an error of some kind.
-@table @code
-@item BZ_CONFIG_ERROR
-Indicates that the library has been improperly compiled on your
-platform -- a major configuration error. Specifically, it means
-that @code{sizeof(char)}, @code{sizeof(short)} and @code{sizeof(int)}
-are not 1, 2 and 4 respectively, as they should be. Note that the
-library should still work properly on 64-bit platforms which follow
-the LP64 programming model -- that is, where @code{sizeof(long)}
-and @code{sizeof(void*)} are 8. Under LP64, @code{sizeof(int)} is
-still 4, so @code{libbzip2}, which doesn't use the @code{long} type,
-is OK.
-@item BZ_SEQUENCE_ERROR
-When using the library, it is important to call the functions in the
-correct sequence and with data structures (buffers etc) in the correct
-states. @code{libbzip2} checks as much as it can to ensure this is
-happening, and returns @code{BZ_SEQUENCE_ERROR} if not. Code which
-complies precisely with the function semantics, as detailed below,
-should never receive this value; such an event denotes buggy code
-which you should investigate.
-@item BZ_PARAM_ERROR
-Returned when a parameter to a function call is out of range
-or otherwise manifestly incorrect. As with @code{BZ_SEQUENCE_ERROR},
-this denotes a bug in the client code. The distinction between
-@code{BZ_PARAM_ERROR} and @code{BZ_SEQUENCE_ERROR} is a bit hazy, but still worth
-making.
-@item BZ_MEM_ERROR
-Returned when a request to allocate memory failed. Note that the
-quantity of memory needed to decompress a stream cannot be determined
-until the stream's header has been read. So @code{BZ2_bzDecompress} and
-@code{BZ2_bzRead} may return @code{BZ_MEM_ERROR} even though some of
-the compressed data has been read. The same is not true for
-compression; once @code{BZ2_bzCompressInit} or @code{BZ2_bzWriteOpen} have
-successfully completed, @code{BZ_MEM_ERROR} cannot occur.
-@item BZ_DATA_ERROR
-Returned when a data integrity error is detected during decompression.
-Most importantly, this means when stored and computed CRCs for the
-data do not match. This value is also returned upon detection of any
-other anomaly in the compressed data.
-@item BZ_DATA_ERROR_MAGIC
-As a special case of @code{BZ_DATA_ERROR}, it is sometimes useful to
-know when the compressed stream does not start with the correct
-magic bytes (@code{'B' 'Z' 'h'}).
-@item BZ_IO_ERROR
-Returned by @code{BZ2_bzRead} and @code{BZ2_bzWrite} when there is an error
-reading or writing in the compressed file, and by @code{BZ2_bzReadOpen}
-and @code{BZ2_bzWriteOpen} for attempts to use a file for which the
-error indicator (viz, @code{ferror(f)}) is set.
-On receipt of @code{BZ_IO_ERROR}, the caller should consult
-@code{errno} and/or @code{perror} to acquire operating-system
-specific information about the problem.
-@item BZ_UNEXPECTED_EOF
-Returned by @code{BZ2_bzRead} when the compressed file finishes
-before the logical end of stream is detected.
-@item BZ_OUTBUFF_FULL
-Returned by @code{BZ2_bzBuffToBuffCompress} and
-@code{BZ2_bzBuffToBuffDecompress} to indicate that the output data
-will not fit into the output buffer provided.
-@end table
-
-
-
-@section Low-level interface
-
-@subsection @code{BZ2_bzCompressInit}
-@example
-typedef
- struct @{
- char *next_in;
- unsigned int avail_in;
- unsigned int total_in_lo32;
- unsigned int total_in_hi32;
-
- char *next_out;
- unsigned int avail_out;
- unsigned int total_out_lo32;
- unsigned int total_out_hi32;
-
- void *state;
-
- void *(*bzalloc)(void *,int,int);
- void (*bzfree)(void *,void *);
- void *opaque;
- @}
- bz_stream;
-
-int BZ2_bzCompressInit ( bz_stream *strm,
- int blockSize100k,
- int verbosity,
- int workFactor );
-
-@end example
-
-Prepares for compression. The @code{bz_stream} structure
-holds all data pertaining to the compression activity.
-A @code{bz_stream} structure should be allocated and initialised
-prior to the call.
-The fields of @code{bz_stream}
-comprise the entirety of the user-visible data. @code{state}
-is a pointer to the private data structures required for compression.
-
-Custom memory allocators are supported, via fields @code{bzalloc},
-@code{bzfree},
-and @code{opaque}. The value
-@code{opaque} is passed to as the first argument to
-all calls to @code{bzalloc} and @code{bzfree}, but is
-otherwise ignored by the library.
-The call @code{bzalloc ( opaque, n, m )} is expected to return a
-pointer @code{p} to
-@code{n * m} bytes of memory, and @code{bzfree ( opaque, p )}
-should free
-that memory.
-
-If you don't want to use a custom memory allocator, set @code{bzalloc},
-@code{bzfree} and
-@code{opaque} to @code{NULL},
-and the library will then use the standard @code{malloc}/@code{free}
-routines.
-
-Before calling @code{BZ2_bzCompressInit}, fields @code{bzalloc},
-@code{bzfree} and @code{opaque} should
-be filled appropriately, as just described. Upon return, the internal
-state will have been allocated and initialised, and @code{total_in_lo32},
-@code{total_in_hi32}, @code{total_out_lo32} and
-@code{total_out_hi32} will have been set to zero.
-These four fields are used by the library
-to inform the caller of the total amount of data passed into and out of
-the library, respectively. You should not try to change them.
-As of version 1.0, 64-bit counts are maintained, even on 32-bit
-platforms, using the @code{_hi32} fields to store the upper 32 bits
-of the count. So, for example, the total amount of data in
-is @code{(total_in_hi32 << 32) + total_in_lo32}.
-
-Parameter @code{blockSize100k} specifies the block size to be used for
-compression. It should be a value between 1 and 9 inclusive, and the
-actual block size used is 100000 x this figure. 9 gives the best
-compression but takes most memory.
-
-Parameter @code{verbosity} should be set to a number between 0 and 4
-inclusive. 0 is silent, and greater numbers give increasingly verbose
-monitoring/debugging output. If the library has been compiled with
-@code{-DBZ_NO_STDIO}, no such output will appear for any verbosity
-setting.
-
-Parameter @code{workFactor} controls how the compression phase behaves
-when presented with worst case, highly repetitive, input data. If
-compression runs into difficulties caused by repetitive data, the
-library switches from the standard sorting algorithm to a fallback
-algorithm. The fallback is slower than the standard algorithm by
-perhaps a factor of three, but always behaves reasonably, no matter how
-bad the input.
-
-Lower values of @code{workFactor} reduce the amount of effort the
-standard algorithm will expend before resorting to the fallback. You
-should set this parameter carefully; too low, and many inputs will be
-handled by the fallback algorithm and so compress rather slowly, too
-high, and your average-to-worst case compression times can become very
-large. The default value of 30 gives reasonable behaviour over a wide
-range of circumstances.
-
-Allowable values range from 0 to 250 inclusive. 0 is a special case,
-equivalent to using the default value of 30.
-
-Note that the compressed output generated is the same regardless of
-whether or not the fallback algorithm is used.
-
-Be aware also that this parameter may disappear entirely in future
-versions of the library. In principle it should be possible to devise a
-good way to automatically choose which algorithm to use. Such a
-mechanism would render the parameter obsolete.
-
-Possible return values:
-@display
- @code{BZ_CONFIG_ERROR}
- if the library has been mis-compiled
- @code{BZ_PARAM_ERROR}
- if @code{strm} is @code{NULL}
- or @code{blockSize} < 1 or @code{blockSize} > 9
- or @code{verbosity} < 0 or @code{verbosity} > 4
- or @code{workFactor} < 0 or @code{workFactor} > 250
- @code{BZ_MEM_ERROR}
- if not enough memory is available
- @code{BZ_OK}
- otherwise
-@end display
-Allowable next actions:
-@display
- @code{BZ2_bzCompress}
- if @code{BZ_OK} is returned
- no specific action needed in case of error
-@end display
-
-@subsection @code{BZ2_bzCompress}
-@example
- int BZ2_bzCompress ( bz_stream *strm, int action );
-@end example
-Provides more input and/or output buffer space for the library. The
-caller maintains input and output buffers, and calls @code{BZ2_bzCompress} to
-transfer data between them.
-
-Before each call to @code{BZ2_bzCompress}, @code{next_in} should point at
-the data to be compressed, and @code{avail_in} should indicate how many
-bytes the library may read. @code{BZ2_bzCompress} updates @code{next_in},
-@code{avail_in} and @code{total_in} to reflect the number of bytes it
-has read.
-
-Similarly, @code{next_out} should point to a buffer in which the
-compressed data is to be placed, with @code{avail_out} indicating how
-much output space is available. @code{BZ2_bzCompress} updates
-@code{next_out}, @code{avail_out} and @code{total_out} to reflect the
-number of bytes output.
-
-You may provide and remove as little or as much data as you like on each
-call of @code{BZ2_bzCompress}. In the limit, it is acceptable to supply and
-remove data one byte at a time, although this would be terribly
-inefficient. You should always ensure that at least one byte of output
-space is available at each call.
-
-A second purpose of @code{BZ2_bzCompress} is to request a change of mode of the
-compressed stream.
-
-Conceptually, a compressed stream can be in one of four states: IDLE,
-RUNNING, FLUSHING and FINISHING. Before initialisation
-(@code{BZ2_bzCompressInit}) and after termination (@code{BZ2_bzCompressEnd}), a
-stream is regarded as IDLE.
-
-Upon initialisation (@code{BZ2_bzCompressInit}), the stream is placed in the
-RUNNING state. Subsequent calls to @code{BZ2_bzCompress} should pass
-@code{BZ_RUN} as the requested action; other actions are illegal and
-will result in @code{BZ_SEQUENCE_ERROR}.
-
-At some point, the calling program will have provided all the input data
-it wants to. It will then want to finish up -- in effect, asking the
-library to process any data it might have buffered internally. In this
-state, @code{BZ2_bzCompress} will no longer attempt to read data from
-@code{next_in}, but it will want to write data to @code{next_out}.
-Because the output buffer supplied by the user can be arbitrarily small,
-the finishing-up operation cannot necessarily be done with a single call
-of @code{BZ2_bzCompress}.
-
-Instead, the calling program passes @code{BZ_FINISH} as an action to
-@code{BZ2_bzCompress}. This changes the stream's state to FINISHING. Any
-remaining input (ie, @code{next_in[0 .. avail_in-1]}) is compressed and
-transferred to the output buffer. To do this, @code{BZ2_bzCompress} must be
-called repeatedly until all the output has been consumed. At that
-point, @code{BZ2_bzCompress} returns @code{BZ_STREAM_END}, and the stream's
-state is set back to IDLE. @code{BZ2_bzCompressEnd} should then be
-called.
-
-Just to make sure the calling program does not cheat, the library makes
-a note of @code{avail_in} at the time of the first call to
-@code{BZ2_bzCompress} which has @code{BZ_FINISH} as an action (ie, at the
-time the program has announced its intention to not supply any more
-input). By comparing this value with that of @code{avail_in} over
-subsequent calls to @code{BZ2_bzCompress}, the library can detect any
-attempts to slip in more data to compress. Any calls for which this is
-detected will return @code{BZ_SEQUENCE_ERROR}. This indicates a
-programming mistake which should be corrected.
-
-Instead of asking to finish, the calling program may ask
-@code{BZ2_bzCompress} to take all the remaining input, compress it and
-terminate the current (Burrows-Wheeler) compression block. This could
-be useful for error control purposes. The mechanism is analogous to
-that for finishing: call @code{BZ2_bzCompress} with an action of
-@code{BZ_FLUSH}, remove output data, and persist with the
-@code{BZ_FLUSH} action until the value @code{BZ_RUN} is returned. As
-with finishing, @code{BZ2_bzCompress} detects any attempt to provide more
-input data once the flush has begun.
-
-Once the flush is complete, the stream returns to the normal RUNNING
-state.
-
-This all sounds pretty complex, but isn't really. Here's a table
-which shows which actions are allowable in each state, what action
-will be taken, what the next state is, and what the non-error return
-values are. Note that you can't explicitly ask what state the
-stream is in, but nor do you need to -- it can be inferred from the
-values returned by @code{BZ2_bzCompress}.
-@display
-IDLE/@code{any}
- Illegal. IDLE state only exists after @code{BZ2_bzCompressEnd} or
- before @code{BZ2_bzCompressInit}.
- Return value = @code{BZ_SEQUENCE_ERROR}
-
-RUNNING/@code{BZ_RUN}
- Compress from @code{next_in} to @code{next_out} as much as possible.
- Next state = RUNNING
- Return value = @code{BZ_RUN_OK}
-
-RUNNING/@code{BZ_FLUSH}
- Remember current value of @code{next_in}. Compress from @code{next_in}
- to @code{next_out} as much as possible, but do not accept any more input.
- Next state = FLUSHING
- Return value = @code{BZ_FLUSH_OK}
-
-RUNNING/@code{BZ_FINISH}
- Remember current value of @code{next_in}. Compress from @code{next_in}
- to @code{next_out} as much as possible, but do not accept any more input.
- Next state = FINISHING
- Return value = @code{BZ_FINISH_OK}
-
-FLUSHING/@code{BZ_FLUSH}
- Compress from @code{next_in} to @code{next_out} as much as possible,
- but do not accept any more input.
- If all the existing input has been used up and all compressed
- output has been removed
- Next state = RUNNING; Return value = @code{BZ_RUN_OK}
- else
- Next state = FLUSHING; Return value = @code{BZ_FLUSH_OK}
-
-FLUSHING/other
- Illegal.
- Return value = @code{BZ_SEQUENCE_ERROR}
-
-FINISHING/@code{BZ_FINISH}
- Compress from @code{next_in} to @code{next_out} as much as possible,
- but to not accept any more input.
- If all the existing input has been used up and all compressed
- output has been removed
- Next state = IDLE; Return value = @code{BZ_STREAM_END}
- else
- Next state = FINISHING; Return value = @code{BZ_FINISHING}
-
-FINISHING/other
- Illegal.
- Return value = @code{BZ_SEQUENCE_ERROR}
-@end display
-
-That still looks complicated? Well, fair enough. The usual sequence
-of calls for compressing a load of data is:
-@itemize @bullet
-@item Get started with @code{BZ2_bzCompressInit}.
-@item Shovel data in and shlurp out its compressed form using zero or more
-calls of @code{BZ2_bzCompress} with action = @code{BZ_RUN}.
-@item Finish up.
-Repeatedly call @code{BZ2_bzCompress} with action = @code{BZ_FINISH},
-copying out the compressed output, until @code{BZ_STREAM_END} is returned.
-@item Close up and go home. Call @code{BZ2_bzCompressEnd}.
-@end itemize
-If the data you want to compress fits into your input buffer all
-at once, you can skip the calls of @code{BZ2_bzCompress ( ..., BZ_RUN )} and
-just do the @code{BZ2_bzCompress ( ..., BZ_FINISH )} calls.
-
-All required memory is allocated by @code{BZ2_bzCompressInit}. The
-compression library can accept any data at all (obviously). So you
-shouldn't get any error return values from the @code{BZ2_bzCompress} calls.
-If you do, they will be @code{BZ_SEQUENCE_ERROR}, and indicate a bug in
-your programming.
-
-Trivial other possible return values:
-@display
- @code{BZ_PARAM_ERROR}
- if @code{strm} is @code{NULL}, or @code{strm->s} is @code{NULL}
-@end display
-
-@subsection @code{BZ2_bzCompressEnd}
-@example
-int BZ2_bzCompressEnd ( bz_stream *strm );
-@end example
-Releases all memory associated with a compression stream.
-
-Possible return values:
-@display
- @code{BZ_PARAM_ERROR} if @code{strm} is @code{NULL} or @code{strm->s} is @code{NULL}
- @code{BZ_OK} otherwise
-@end display
-
-
-@subsection @code{BZ2_bzDecompressInit}
-@example
-int BZ2_bzDecompressInit ( bz_stream *strm, int verbosity, int small );
-@end example
-Prepares for decompression. As with @code{BZ2_bzCompressInit}, a
-@code{bz_stream} record should be allocated and initialised before the
-call. Fields @code{bzalloc}, @code{bzfree} and @code{opaque} should be
-set if a custom memory allocator is required, or made @code{NULL} for
-the normal @code{malloc}/@code{free} routines. Upon return, the internal
-state will have been initialised, and @code{total_in} and
-@code{total_out} will be zero.
-
-For the meaning of parameter @code{verbosity}, see @code{BZ2_bzCompressInit}.
-
-If @code{small} is nonzero, the library will use an alternative
-decompression algorithm which uses less memory but at the cost of
-decompressing more slowly (roughly speaking, half the speed, but the
-maximum memory requirement drops to around 2300k). See Chapter 2 for
-more information on memory management.
-
-Note that the amount of memory needed to decompress
-a stream cannot be determined until the stream's header has been read,
-so even if @code{BZ2_bzDecompressInit} succeeds, a subsequent
-@code{BZ2_bzDecompress} could fail with @code{BZ_MEM_ERROR}.
-
-Possible return values:
-@display
- @code{BZ_CONFIG_ERROR}
- if the library has been mis-compiled
- @code{BZ_PARAM_ERROR}
- if @code{(small != 0 && small != 1)}
- or @code{(verbosity < 0 || verbosity > 4)}
- @code{BZ_MEM_ERROR}
- if insufficient memory is available
-@end display
-
-Allowable next actions:
-@display
- @code{BZ2_bzDecompress}
- if @code{BZ_OK} was returned
- no specific action required in case of error
-@end display
-
-
-
-@subsection @code{BZ2_bzDecompress}
-@example
-int BZ2_bzDecompress ( bz_stream *strm );
-@end example
-Provides more input and/out output buffer space for the library. The
-caller maintains input and output buffers, and uses @code{BZ2_bzDecompress}
-to transfer data between them.
-
-Before each call to @code{BZ2_bzDecompress}, @code{next_in}
-should point at the compressed data,
-and @code{avail_in} should indicate how many bytes the library
-may read. @code{BZ2_bzDecompress} updates @code{next_in}, @code{avail_in}
-and @code{total_in}
-to reflect the number of bytes it has read.
-
-Similarly, @code{next_out} should point to a buffer in which the uncompressed
-output is to be placed, with @code{avail_out} indicating how much output space
-is available. @code{BZ2_bzCompress} updates @code{next_out},
-@code{avail_out} and @code{total_out} to reflect
-the number of bytes output.
-
-You may provide and remove as little or as much data as you like on
-each call of @code{BZ2_bzDecompress}.
-In the limit, it is acceptable to
-supply and remove data one byte at a time, although this would be
-terribly inefficient. You should always ensure that at least one
-byte of output space is available at each call.
-
-Use of @code{BZ2_bzDecompress} is simpler than @code{BZ2_bzCompress}.
-
-You should provide input and remove output as described above, and
-repeatedly call @code{BZ2_bzDecompress} until @code{BZ_STREAM_END} is
-returned. Appearance of @code{BZ_STREAM_END} denotes that
-@code{BZ2_bzDecompress} has detected the logical end of the compressed
-stream. @code{BZ2_bzDecompress} will not produce @code{BZ_STREAM_END} until
-all output data has been placed into the output buffer, so once
-@code{BZ_STREAM_END} appears, you are guaranteed to have available all
-the decompressed output, and @code{BZ2_bzDecompressEnd} can safely be
-called.
-
-If case of an error return value, you should call @code{BZ2_bzDecompressEnd}
-to clean up and release memory.
-
-Possible return values:
-@display
- @code{BZ_PARAM_ERROR}
- if @code{strm} is @code{NULL} or @code{strm->s} is @code{NULL}
- or @code{strm->avail_out < 1}
- @code{BZ_DATA_ERROR}
- if a data integrity error is detected in the compressed stream
- @code{BZ_DATA_ERROR_MAGIC}
- if the compressed stream doesn't begin with the right magic bytes
- @code{BZ_MEM_ERROR}
- if there wasn't enough memory available
- @code{BZ_STREAM_END}
- if the logical end of the data stream was detected and all
- output in has been consumed, eg @code{s->avail_out > 0}
- @code{BZ_OK}
- otherwise
-@end display
-Allowable next actions:
-@display
- @code{BZ2_bzDecompress}
- if @code{BZ_OK} was returned
- @code{BZ2_bzDecompressEnd}
- otherwise
-@end display
-
-
-@subsection @code{BZ2_bzDecompressEnd}
-@example
-int BZ2_bzDecompressEnd ( bz_stream *strm );
-@end example
-Releases all memory associated with a decompression stream.
-
-Possible return values:
-@display
- @code{BZ_PARAM_ERROR}
- if @code{strm} is @code{NULL} or @code{strm->s} is @code{NULL}
- @code{BZ_OK}
- otherwise
-@end display
-
-Allowable next actions:
-@display
- None.
-@end display
-
-
-@section High-level interface
-
-This interface provides functions for reading and writing
-@code{bzip2} format files. First, some general points.
-
-@itemize @bullet
-@item All of the functions take an @code{int*} first argument,
- @code{bzerror}.
- After each call, @code{bzerror} should be consulted first to determine
- the outcome of the call. If @code{bzerror} is @code{BZ_OK},
- the call completed
- successfully, and only then should the return value of the function
- (if any) be consulted. If @code{bzerror} is @code{BZ_IO_ERROR},
- there was an error
- reading/writing the underlying compressed file, and you should
- then consult @code{errno}/@code{perror} to determine the
- cause of the difficulty.
- @code{bzerror} may also be set to various other values; precise details are
- given on a per-function basis below.
-@item If @code{bzerror} indicates an error
- (ie, anything except @code{BZ_OK} and @code{BZ_STREAM_END}),
- you should immediately call @code{BZ2_bzReadClose} (or @code{BZ2_bzWriteClose},
- depending on whether you are attempting to read or to write)
- to free up all resources associated
- with the stream. Once an error has been indicated, behaviour of all calls
- except @code{BZ2_bzReadClose} (@code{BZ2_bzWriteClose}) is undefined.
- The implication is that (1) @code{bzerror} should
- be checked after each call, and (2) if @code{bzerror} indicates an error,
- @code{BZ2_bzReadClose} (@code{BZ2_bzWriteClose}) should then be called to clean up.
-@item The @code{FILE*} arguments passed to
- @code{BZ2_bzReadOpen}/@code{BZ2_bzWriteOpen}
- should be set to binary mode.
- Most Unix systems will do this by default, but other platforms,
- including Windows and Mac, will not. If you omit this, you may
- encounter problems when moving code to new platforms.
-@item Memory allocation requests are handled by
- @code{malloc}/@code{free}.
- At present
- there is no facility for user-defined memory allocators in the file I/O
- functions (could easily be added, though).
-@end itemize
-
-
-
-@subsection @code{BZ2_bzReadOpen}
-@example
- typedef void BZFILE;
-
- BZFILE *BZ2_bzReadOpen ( int *bzerror, FILE *f,
- int small, int verbosity,
- void *unused, int nUnused );
-@end example
-Prepare to read compressed data from file handle @code{f}. @code{f}
-should refer to a file which has been opened for reading, and for which
-the error indicator (@code{ferror(f)})is not set. If @code{small} is 1,
-the library will try to decompress using less memory, at the expense of
-speed.
-
-For reasons explained below, @code{BZ2_bzRead} will decompress the
-@code{nUnused} bytes starting at @code{unused}, before starting to read
-from the file @code{f}. At most @code{BZ_MAX_UNUSED} bytes may be
-supplied like this. If this facility is not required, you should pass
-@code{NULL} and @code{0} for @code{unused} and n@code{Unused}
-respectively.
-
-For the meaning of parameters @code{small} and @code{verbosity},
-see @code{BZ2_bzDecompressInit}.
-
-The amount of memory needed to decompress a file cannot be determined
-until the file's header has been read. So it is possible that
-@code{BZ2_bzReadOpen} returns @code{BZ_OK} but a subsequent call of
-@code{BZ2_bzRead} will return @code{BZ_MEM_ERROR}.
-
-Possible assignments to @code{bzerror}:
-@display
- @code{BZ_CONFIG_ERROR}
- if the library has been mis-compiled
- @code{BZ_PARAM_ERROR}
- if @code{f} is @code{NULL}
- or @code{small} is neither @code{0} nor @code{1}
- or @code{(unused == NULL && nUnused != 0)}
- or @code{(unused != NULL && !(0 <= nUnused <= BZ_MAX_UNUSED))}
- @code{BZ_IO_ERROR}
- if @code{ferror(f)} is nonzero
- @code{BZ_MEM_ERROR}
- if insufficient memory is available
- @code{BZ_OK}
- otherwise.
-@end display
-
-Possible return values:
-@display
- Pointer to an abstract @code{BZFILE}
- if @code{bzerror} is @code{BZ_OK}
- @code{NULL}
- otherwise
-@end display
-
-Allowable next actions:
-@display
- @code{BZ2_bzRead}
- if @code{bzerror} is @code{BZ_OK}
- @code{BZ2_bzClose}
- otherwise
-@end display
-
-
-@subsection @code{BZ2_bzRead}
-@example
- int BZ2_bzRead ( int *bzerror, BZFILE *b, void *buf, int len );
-@end example
-Reads up to @code{len} (uncompressed) bytes from the compressed file
-@code{b} into
-the buffer @code{buf}. If the read was successful,
-@code{bzerror} is set to @code{BZ_OK}
-and the number of bytes read is returned. If the logical end-of-stream
-was detected, @code{bzerror} will be set to @code{BZ_STREAM_END},
-and the number
-of bytes read is returned. All other @code{bzerror} values denote an error.
-
-@code{BZ2_bzRead} will supply @code{len} bytes,
-unless the logical stream end is detected
-or an error occurs. Because of this, it is possible to detect the
-stream end by observing when the number of bytes returned is
-less than the number
-requested. Nevertheless, this is regarded as inadvisable; you should
-instead check @code{bzerror} after every call and watch out for
-@code{BZ_STREAM_END}.
-
-Internally, @code{BZ2_bzRead} copies data from the compressed file in chunks
-of size @code{BZ_MAX_UNUSED} bytes
-before decompressing it. If the file contains more bytes than strictly
-needed to reach the logical end-of-stream, @code{BZ2_bzRead} will almost certainly
-read some of the trailing data before signalling @code{BZ_SEQUENCE_END}.
-To collect the read but unused data once @code{BZ_SEQUENCE_END} has
-appeared, call @code{BZ2_bzReadGetUnused} immediately before @code{BZ2_bzReadClose}.
-
-Possible assignments to @code{bzerror}:
-@display
- @code{BZ_PARAM_ERROR}
- if @code{b} is @code{NULL} or @code{buf} is @code{NULL} or @code{len < 0}
- @code{BZ_SEQUENCE_ERROR}
- if @code{b} was opened with @code{BZ2_bzWriteOpen}
- @code{BZ_IO_ERROR}
- if there is an error reading from the compressed file
- @code{BZ_UNEXPECTED_EOF}
- if the compressed file ended before the logical end-of-stream was detected
- @code{BZ_DATA_ERROR}
- if a data integrity error was detected in the compressed stream
- @code{BZ_DATA_ERROR_MAGIC}
- if the stream does not begin with the requisite header bytes (ie, is not
- a @code{bzip2} data file). This is really a special case of @code{BZ_DATA_ERROR}.
- @code{BZ_MEM_ERROR}
- if insufficient memory was available
- @code{BZ_STREAM_END}
- if the logical end of stream was detected.
- @code{BZ_OK}
- otherwise.
-@end display
-
-Possible return values:
-@display
- number of bytes read
- if @code{bzerror} is @code{BZ_OK} or @code{BZ_STREAM_END}
- undefined
- otherwise
-@end display
-
-Allowable next actions:
-@display
- collect data from @code{buf}, then @code{BZ2_bzRead} or @code{BZ2_bzReadClose}
- if @code{bzerror} is @code{BZ_OK}
- collect data from @code{buf}, then @code{BZ2_bzReadClose} or @code{BZ2_bzReadGetUnused}
- if @code{bzerror} is @code{BZ_SEQUENCE_END}
- @code{BZ2_bzReadClose}
- otherwise
-@end display
-
-
-
-@subsection @code{BZ2_bzReadGetUnused}
-@example
- void BZ2_bzReadGetUnused ( int* bzerror, BZFILE *b,
- void** unused, int* nUnused );
-@end example
-Returns data which was read from the compressed file but was not needed
-to get to the logical end-of-stream. @code{*unused} is set to the address
-of the data, and @code{*nUnused} to the number of bytes. @code{*nUnused} will
-be set to a value between @code{0} and @code{BZ_MAX_UNUSED} inclusive.
-
-This function may only be called once @code{BZ2_bzRead} has signalled
-@code{BZ_STREAM_END} but before @code{BZ2_bzReadClose}.
-
-Possible assignments to @code{bzerror}:
-@display
- @code{BZ_PARAM_ERROR}
- if @code{b} is @code{NULL}
- or @code{unused} is @code{NULL} or @code{nUnused} is @code{NULL}
- @code{BZ_SEQUENCE_ERROR}
- if @code{BZ_STREAM_END} has not been signalled
- or if @code{b} was opened with @code{BZ2_bzWriteOpen}
- @code{BZ_OK}
- otherwise
-@end display
-
-Allowable next actions:
-@display
- @code{BZ2_bzReadClose}
-@end display
-
-
-@subsection @code{BZ2_bzReadClose}
-@example
- void BZ2_bzReadClose ( int *bzerror, BZFILE *b );
-@end example
-Releases all memory pertaining to the compressed file @code{b}.
-@code{BZ2_bzReadClose} does not call @code{fclose} on the underlying file
-handle, so you should do that yourself if appropriate.
-@code{BZ2_bzReadClose} should be called to clean up after all error
-situations.
-
-Possible assignments to @code{bzerror}:
-@display
- @code{BZ_SEQUENCE_ERROR}
- if @code{b} was opened with @code{BZ2_bzOpenWrite}
- @code{BZ_OK}
- otherwise
-@end display
-
-Allowable next actions:
-@display
- none
-@end display
-
-
-
-@subsection @code{BZ2_bzWriteOpen}
-@example
- BZFILE *BZ2_bzWriteOpen ( int *bzerror, FILE *f,
- int blockSize100k, int verbosity,
- int workFactor );
-@end example
-Prepare to write compressed data to file handle @code{f}.
-@code{f} should refer to
-a file which has been opened for writing, and for which the error
-indicator (@code{ferror(f)})is not set.
-
-For the meaning of parameters @code{blockSize100k},
-@code{verbosity} and @code{workFactor}, see
-@* @code{BZ2_bzCompressInit}.
-
-All required memory is allocated at this stage, so if the call
-completes successfully, @code{BZ_MEM_ERROR} cannot be signalled by a
-subsequent call to @code{BZ2_bzWrite}.
-
-Possible assignments to @code{bzerror}:
-@display
- @code{BZ_CONFIG_ERROR}
- if the library has been mis-compiled
- @code{BZ_PARAM_ERROR}
- if @code{f} is @code{NULL}
- or @code{blockSize100k < 1} or @code{blockSize100k > 9}
- @code{BZ_IO_ERROR}
- if @code{ferror(f)} is nonzero
- @code{BZ_MEM_ERROR}
- if insufficient memory is available
- @code{BZ_OK}
- otherwise
-@end display
-
-Possible return values:
-@display
- Pointer to an abstract @code{BZFILE}
- if @code{bzerror} is @code{BZ_OK}
- @code{NULL}
- otherwise
-@end display
-
-Allowable next actions:
-@display
- @code{BZ2_bzWrite}
- if @code{bzerror} is @code{BZ_OK}
- (you could go directly to @code{BZ2_bzWriteClose}, but this would be pretty pointless)
- @code{BZ2_bzWriteClose}
- otherwise
-@end display
-
-
-
-@subsection @code{BZ2_bzWrite}
-@example
- void BZ2_bzWrite ( int *bzerror, BZFILE *b, void *buf, int len );
-@end example
-Absorbs @code{len} bytes from the buffer @code{buf}, eventually to be
-compressed and written to the file.
-
-Possible assignments to @code{bzerror}:
-@display
- @code{BZ_PARAM_ERROR}
- if @code{b} is @code{NULL} or @code{buf} is @code{NULL} or @code{len < 0}
- @code{BZ_SEQUENCE_ERROR}
- if b was opened with @code{BZ2_bzReadOpen}
- @code{BZ_IO_ERROR}
- if there is an error writing the compressed file.
- @code{BZ_OK}
- otherwise
-@end display
-
-
-
-
-@subsection @code{BZ2_bzWriteClose}
-@example
- void BZ2_bzWriteClose ( int *bzerror, BZFILE* f,
- int abandon,
- unsigned int* nbytes_in,
- unsigned int* nbytes_out );
-
- void BZ2_bzWriteClose64 ( int *bzerror, BZFILE* f,
- int abandon,
- unsigned int* nbytes_in_lo32,
- unsigned int* nbytes_in_hi32,
- unsigned int* nbytes_out_lo32,
- unsigned int* nbytes_out_hi32 );
-@end example
-
-Compresses and flushes to the compressed file all data so far supplied
-by @code{BZ2_bzWrite}. The logical end-of-stream markers are also written, so
-subsequent calls to @code{BZ2_bzWrite} are illegal. All memory associated
-with the compressed file @code{b} is released.
-@code{fflush} is called on the
-compressed file, but it is not @code{fclose}'d.
-
-If @code{BZ2_bzWriteClose} is called to clean up after an error, the only
-action is to release the memory. The library records the error codes
-issued by previous calls, so this situation will be detected
-automatically. There is no attempt to complete the compression
-operation, nor to @code{fflush} the compressed file. You can force this
-behaviour to happen even in the case of no error, by passing a nonzero
-value to @code{abandon}.
-
-If @code{nbytes_in} is non-null, @code{*nbytes_in} will be set to be the
-total volume of uncompressed data handled. Similarly, @code{nbytes_out}
-will be set to the total volume of compressed data written. For
-compatibility with older versions of the library, @code{BZ2_bzWriteClose}
-only yields the lower 32 bits of these counts. Use
-@code{BZ2_bzWriteClose64} if you want the full 64 bit counts. These
-two functions are otherwise absolutely identical.
-
-
-Possible assignments to @code{bzerror}:
-@display
- @code{BZ_SEQUENCE_ERROR}
- if @code{b} was opened with @code{BZ2_bzReadOpen}
- @code{BZ_IO_ERROR}
- if there is an error writing the compressed file
- @code{BZ_OK}
- otherwise
-@end display
-
-@subsection Handling embedded compressed data streams
-
-The high-level library facilitates use of
-@code{bzip2} data streams which form some part of a surrounding, larger
-data stream.
-@itemize @bullet
-@item For writing, the library takes an open file handle, writes
-compressed data to it, @code{fflush}es it but does not @code{fclose} it.
-The calling application can write its own data before and after the
-compressed data stream, using that same file handle.
-@item Reading is more complex, and the facilities are not as general
-as they could be since generality is hard to reconcile with efficiency.
-@code{BZ2_bzRead} reads from the compressed file in blocks of size
-@code{BZ_MAX_UNUSED} bytes, and in doing so probably will overshoot
-the logical end of compressed stream.
-To recover this data once decompression has
-ended, call @code{BZ2_bzReadGetUnused} after the last call of @code{BZ2_bzRead}
-(the one returning @code{BZ_STREAM_END}) but before calling
-@code{BZ2_bzReadClose}.
-@end itemize
-
-This mechanism makes it easy to decompress multiple @code{bzip2}
-streams placed end-to-end. As the end of one stream, when @code{BZ2_bzRead}
-returns @code{BZ_STREAM_END}, call @code{BZ2_bzReadGetUnused} to collect the
-unused data (copy it into your own buffer somewhere).
-That data forms the start of the next compressed stream.
-To start uncompressing that next stream, call @code{BZ2_bzReadOpen} again,
-feeding in the unused data via the @code{unused}/@code{nUnused}
-parameters.
-Keep doing this until @code{BZ_STREAM_END} return coincides with the
-physical end of file (@code{feof(f)}). In this situation
-@code{BZ2_bzReadGetUnused}
-will of course return no data.
-
-This should give some feel for how the high-level interface can be used.
-If you require extra flexibility, you'll have to bite the bullet and get
-to grips with the low-level interface.
-
-@subsection Standard file-reading/writing code
-Here's how you'd write data to a compressed file:
-@example @code
-FILE* f;
-BZFILE* b;
-int nBuf;
-char buf[ /* whatever size you like */ ];
-int bzerror;
-int nWritten;
-
-f = fopen ( "myfile.bz2", "w" );
-if (!f) @{
- /* handle error */
-@}
-b = BZ2_bzWriteOpen ( &bzerror, f, 9 );
-if (bzerror != BZ_OK) @{
- BZ2_bzWriteClose ( b );
- /* handle error */
-@}
-
-while ( /* condition */ ) @{
- /* get data to write into buf, and set nBuf appropriately */
- nWritten = BZ2_bzWrite ( &bzerror, b, buf, nBuf );
- if (bzerror == BZ_IO_ERROR) @{
- BZ2_bzWriteClose ( &bzerror, b );
- /* handle error */
- @}
-@}
-
-BZ2_bzWriteClose ( &bzerror, b );
-if (bzerror == BZ_IO_ERROR) @{
- /* handle error */
-@}
-@end example
-And to read from a compressed file:
-@example
-FILE* f;
-BZFILE* b;
-int nBuf;
-char buf[ /* whatever size you like */ ];
-int bzerror;
-int nWritten;
-
-f = fopen ( "myfile.bz2", "r" );
-if (!f) @{
- /* handle error */
-@}
-b = BZ2_bzReadOpen ( &bzerror, f, 0, NULL, 0 );
-if (bzerror != BZ_OK) @{
- BZ2_bzReadClose ( &bzerror, b );
- /* handle error */
-@}
-
-bzerror = BZ_OK;
-while (bzerror == BZ_OK && /* arbitrary other conditions */) @{
- nBuf = BZ2_bzRead ( &bzerror, b, buf, /* size of buf */ );
- if (bzerror == BZ_OK) @{
- /* do something with buf[0 .. nBuf-1] */
- @}
-@}
-if (bzerror != BZ_STREAM_END) @{
- BZ2_bzReadClose ( &bzerror, b );
- /* handle error */
-@} else @{
- BZ2_bzReadClose ( &bzerror );
-@}
-@end example
-
-
-
-@section Utility functions
-@subsection @code{BZ2_bzBuffToBuffCompress}
-@example
- int BZ2_bzBuffToBuffCompress( char* dest,
- unsigned int* destLen,
- char* source,
- unsigned int sourceLen,
- int blockSize100k,
- int verbosity,
- int workFactor );
-@end example
-Attempts to compress the data in @code{source[0 .. sourceLen-1]}
-into the destination buffer, @code{dest[0 .. *destLen-1]}.
-If the destination buffer is big enough, @code{*destLen} is
-set to the size of the compressed data, and @code{BZ_OK} is
-returned. If the compressed data won't fit, @code{*destLen}
-is unchanged, and @code{BZ_OUTBUFF_FULL} is returned.
-
-Compression in this manner is a one-shot event, done with a single call
-to this function. The resulting compressed data is a complete
-@code{bzip2} format data stream. There is no mechanism for making
-additional calls to provide extra input data. If you want that kind of
-mechanism, use the low-level interface.
-
-For the meaning of parameters @code{blockSize100k}, @code{verbosity}
-and @code{workFactor}, @* see @code{BZ2_bzCompressInit}.
-
-To guarantee that the compressed data will fit in its buffer, allocate
-an output buffer of size 1% larger than the uncompressed data, plus
-six hundred extra bytes.
-
-@code{BZ2_bzBuffToBuffDecompress} will not write data at or
-beyond @code{dest[*destLen]}, even in case of buffer overflow.
-
-Possible return values:
-@display
- @code{BZ_CONFIG_ERROR}
- if the library has been mis-compiled
- @code{BZ_PARAM_ERROR}
- if @code{dest} is @code{NULL} or @code{destLen} is @code{NULL}
- or @code{blockSize100k < 1} or @code{blockSize100k > 9}
- or @code{verbosity < 0} or @code{verbosity > 4}
- or @code{workFactor < 0} or @code{workFactor > 250}
- @code{BZ_MEM_ERROR}
- if insufficient memory is available
- @code{BZ_OUTBUFF_FULL}
- if the size of the compressed data exceeds @code{*destLen}
- @code{BZ_OK}
- otherwise
-@end display
-
-
-
-@subsection @code{BZ2_bzBuffToBuffDecompress}
-@example
- int BZ2_bzBuffToBuffDecompress ( char* dest,
- unsigned int* destLen,
- char* source,
- unsigned int sourceLen,
- int small,
- int verbosity );
-@end example
-Attempts to decompress the data in @code{source[0 .. sourceLen-1]}
-into the destination buffer, @code{dest[0 .. *destLen-1]}.
-If the destination buffer is big enough, @code{*destLen} is
-set to the size of the uncompressed data, and @code{BZ_OK} is
-returned. If the compressed data won't fit, @code{*destLen}
-is unchanged, and @code{BZ_OUTBUFF_FULL} is returned.
-
-@code{source} is assumed to hold a complete @code{bzip2} format
-data stream. @* @code{BZ2_bzBuffToBuffDecompress} tries to decompress
-the entirety of the stream into the output buffer.
-
-For the meaning of parameters @code{small} and @code{verbosity},
-see @code{BZ2_bzDecompressInit}.
-
-Because the compression ratio of the compressed data cannot be known in
-advance, there is no easy way to guarantee that the output buffer will
-be big enough. You may of course make arrangements in your code to
-record the size of the uncompressed data, but such a mechanism is beyond
-the scope of this library.
-
-@code{BZ2_bzBuffToBuffDecompress} will not write data at or
-beyond @code{dest[*destLen]}, even in case of buffer overflow.
-
-Possible return values:
-@display
- @code{BZ_CONFIG_ERROR}
- if the library has been mis-compiled
- @code{BZ_PARAM_ERROR}
- if @code{dest} is @code{NULL} or @code{destLen} is @code{NULL}
- or @code{small != 0 && small != 1}
- or @code{verbosity < 0} or @code{verbosity > 4}
- @code{BZ_MEM_ERROR}
- if insufficient memory is available
- @code{BZ_OUTBUFF_FULL}
- if the size of the compressed data exceeds @code{*destLen}
- @code{BZ_DATA_ERROR}
- if a data integrity error was detected in the compressed data
- @code{BZ_DATA_ERROR_MAGIC}
- if the compressed data doesn't begin with the right magic bytes
- @code{BZ_UNEXPECTED_EOF}
- if the compressed data ends unexpectedly
- @code{BZ_OK}
- otherwise
-@end display
-
-
-
-@section @code{zlib} compatibility functions
-Yoshioka Tsuneo has contributed some functions to
-give better @code{zlib} compatibility. These functions are
-@code{BZ2_bzopen}, @code{BZ2_bzread}, @code{BZ2_bzwrite}, @code{BZ2_bzflush},
-@code{BZ2_bzclose},
-@code{BZ2_bzerror} and @code{BZ2_bzlibVersion}.
-These functions are not (yet) officially part of
-the library. If they break, you get to keep all the pieces.
-Nevertheless, I think they work ok.
-@example
-typedef void BZFILE;
-
-const char * BZ2_bzlibVersion ( void );
-@end example
-Returns a string indicating the library version.
-@example
-BZFILE * BZ2_bzopen ( const char *path, const char *mode );
-BZFILE * BZ2_bzdopen ( int fd, const char *mode );
-@end example
-Opens a @code{.bz2} file for reading or writing, using either its name
-or a pre-existing file descriptor.
-Analogous to @code{fopen} and @code{fdopen}.
-@example
-int BZ2_bzread ( BZFILE* b, void* buf, int len );
-int BZ2_bzwrite ( BZFILE* b, void* buf, int len );
-@end example
-Reads/writes data from/to a previously opened @code{BZFILE}.
-Analogous to @code{fread} and @code{fwrite}.
-@example
-int BZ2_bzflush ( BZFILE* b );
-void BZ2_bzclose ( BZFILE* b );
-@end example
-Flushes/closes a @code{BZFILE}. @code{BZ2_bzflush} doesn't actually do
-anything. Analogous to @code{fflush} and @code{fclose}.
-
-@example
-const char * BZ2_bzerror ( BZFILE *b, int *errnum )
-@end example
-Returns a string describing the more recent error status of
-@code{b}, and also sets @code{*errnum} to its numerical value.
-
-
-@section Using the library in a @code{stdio}-free environment
-
-@subsection Getting rid of @code{stdio}
-
-In a deeply embedded application, you might want to use just
-the memory-to-memory functions. You can do this conveniently
-by compiling the library with preprocessor symbol @code{BZ_NO_STDIO}
-defined. Doing this gives you a library containing only the following
-eight functions:
-
-@code{BZ2_bzCompressInit}, @code{BZ2_bzCompress}, @code{BZ2_bzCompressEnd} @*
-@code{BZ2_bzDecompressInit}, @code{BZ2_bzDecompress}, @code{BZ2_bzDecompressEnd} @*
-@code{BZ2_bzBuffToBuffCompress}, @code{BZ2_bzBuffToBuffDecompress}
-
-When compiled like this, all functions will ignore @code{verbosity}
-settings.
-
-@subsection Critical error handling
-@code{libbzip2} contains a number of internal assertion checks which
-should, needless to say, never be activated. Nevertheless, if an
-assertion should fail, behaviour depends on whether or not the library
-was compiled with @code{BZ_NO_STDIO} set.
-
-For a normal compile, an assertion failure yields the message
-@example
- bzip2/libbzip2: internal error number N.
- This is a bug in bzip2/libbzip2, 1.0 of 21-Mar-2000.
- Please report it to me at: jseward@@acm.org. If this happened
- when you were using some program which uses libbzip2 as a
- component, you should also report this bug to the author(s)
- of that program. Please make an effort to report this bug;
- timely and accurate bug reports eventually lead to higher
- quality software. Thanks. Julian Seward, 21 March 2000.
-@end example
-where @code{N} is some error code number. @code{exit(3)}
-is then called.
-
-For a @code{stdio}-free library, assertion failures result
-in a call to a function declared as:
-@example
- extern void bz_internal_error ( int errcode );
-@end example
-The relevant code is passed as a parameter. You should supply
-such a function.
-
-In either case, once an assertion failure has occurred, any
-@code{bz_stream} records involved can be regarded as invalid.
-You should not attempt to resume normal operation with them.
-
-You may, of course, change critical error handling to suit
-your needs. As I said above, critical errors indicate bugs
-in the library and should not occur. All "normal" error
-situations are indicated via error return codes from functions,
-and can be recovered from.
-
-
-@section Making a Windows DLL
-Everything related to Windows has been contributed by Yoshioka Tsuneo
-@* (@code{QWF00133@@niftyserve.or.jp} /
-@code{tsuneo-y@@is.aist-nara.ac.jp}), so you should send your queries to
-him (but perhaps Cc: me, @code{jseward@@acm.org}).
-
-My vague understanding of what to do is: using Visual C++ 5.0,
-open the project file @code{libbz2.dsp}, and build. That's all.
-
-If you can't
-open the project file for some reason, make a new one, naming these files:
-@code{blocksort.c}, @code{bzlib.c}, @code{compress.c},
-@code{crctable.c}, @code{decompress.c}, @code{huffman.c}, @*
-@code{randtable.c} and @code{libbz2.def}. You will also need
-to name the header files @code{bzlib.h} and @code{bzlib_private.h}.
-
-If you don't use VC++, you may need to define the proprocessor symbol
-@code{_WIN32}.
-
-Finally, @code{dlltest.c} is a sample program using the DLL. It has a
-project file, @code{dlltest.dsp}.
-
-If you just want a makefile for Visual C, have a look at
-@code{makefile.msc}.
-
-Be aware that if you compile @code{bzip2} itself on Win32, you must set
-@code{BZ_UNIX} to 0 and @code{BZ_LCCWIN32} to 1, in the file
-@code{bzip2.c}, before compiling. Otherwise the resulting binary won't
-work correctly.
-
-I haven't tried any of this stuff myself, but it all looks plausible.
-
-
-
-@chapter Miscellanea
-
-These are just some random thoughts of mine. Your mileage may
-vary.
-
-@section Limitations of the compressed file format
-@code{bzip2-1.0}, @code{0.9.5} and @code{0.9.0}
-use exactly the same file format as the previous
-version, @code{bzip2-0.1}. This decision was made in the interests of
-stability. Creating yet another incompatible compressed file format
-would create further confusion and disruption for users.
-
-Nevertheless, this is not a painless decision. Development
-work since the release of @code{bzip2-0.1} in August 1997
-has shown complexities in the file format which slow down
-decompression and, in retrospect, are unnecessary. These are:
-@itemize @bullet
-@item The run-length encoder, which is the first of the
- compression transformations, is entirely irrelevant.
- The original purpose was to protect the sorting algorithm
- from the very worst case input: a string of repeated
- symbols. But algorithm steps Q6a and Q6b in the original
- Burrows-Wheeler technical report (SRC-124) show how
- repeats can be handled without difficulty in block
- sorting.
-@item The randomisation mechanism doesn't really need to be
- there. Udi Manber and Gene Myers published a suffix
- array construction algorithm a few years back, which
- can be employed to sort any block, no matter how
- repetitive, in O(N log N) time. Subsequent work by
- Kunihiko Sadakane has produced a derivative O(N (log N)^2)
- algorithm which usually outperforms the Manber-Myers
- algorithm.
-
- I could have changed to Sadakane's algorithm, but I find
- it to be slower than @code{bzip2}'s existing algorithm for
- most inputs, and the randomisation mechanism protects
- adequately against bad cases. I didn't think it was
- a good tradeoff to make. Partly this is due to the fact
- that I was not flooded with email complaints about
- @code{bzip2-0.1}'s performance on repetitive data, so
- perhaps it isn't a problem for real inputs.
-
- Probably the best long-term solution,
- and the one I have incorporated into 0.9.5 and above,
- is to use the existing sorting
- algorithm initially, and fall back to a O(N (log N)^2)
- algorithm if the standard algorithm gets into difficulties.
-@item The compressed file format was never designed to be
- handled by a library, and I have had to jump though
- some hoops to produce an efficient implementation of
- decompression. It's a bit hairy. Try passing
- @code{decompress.c} through the C preprocessor
- and you'll see what I mean. Much of this complexity
- could have been avoided if the compressed size of
- each block of data was recorded in the data stream.
-@item An Adler-32 checksum, rather than a CRC32 checksum,
- would be faster to compute.
-@end itemize
-It would be fair to say that the @code{bzip2} format was frozen
-before I properly and fully understood the performance
-consequences of doing so.
-
-Improvements which I was able to incorporate into
-0.9.0, despite using the same file format, are:
-@itemize @bullet
-@item Single array implementation of the inverse BWT. This
- significantly speeds up decompression, presumably
- because it reduces the number of cache misses.
-@item Faster inverse MTF transform for large MTF values. The
- new implementation is based on the notion of sliding blocks
- of values.
-@item @code{bzip2-0.9.0} now reads and writes files with @code{fread}
- and @code{fwrite}; version 0.1 used @code{putc} and @code{getc}.
- Duh! Well, you live and learn.
-
-@end itemize
-Further ahead, it would be nice
-to be able to do random access into files. This will
-require some careful design of compressed file formats.
-
-
-
-@section Portability issues
-After some consideration, I have decided not to use
-GNU @code{autoconf} to configure 0.9.5 or 1.0.
-
-@code{autoconf}, admirable and wonderful though it is,
-mainly assists with portability problems between Unix-like
-platforms. But @code{bzip2} doesn't have much in the way
-of portability problems on Unix; most of the difficulties appear
-when porting to the Mac, or to Microsoft's operating systems.
-@code{autoconf} doesn't help in those cases, and brings in a
-whole load of new complexity.
-
-Most people should be able to compile the library and program
-under Unix straight out-of-the-box, so to speak, especially
-if you have a version of GNU C available.
-
-There are a couple of @code{__inline__} directives in the code. GNU C
-(@code{gcc}) should be able to handle them. If you're not using
-GNU C, your C compiler shouldn't see them at all.
-If your compiler does, for some reason, see them and doesn't
-like them, just @code{#define} @code{__inline__} to be @code{/* */}. One
-easy way to do this is to compile with the flag @code{-D__inline__=},
-which should be understood by most Unix compilers.
-
-If you still have difficulties, try compiling with the macro
-@code{BZ_STRICT_ANSI} defined. This should enable you to build the
-library in a strictly ANSI compliant environment. Building the program
-itself like this is dangerous and not supported, since you remove
-@code{bzip2}'s checks against compressing directories, symbolic links,
-devices, and other not-really-a-file entities. This could cause
-filesystem corruption!
-
-One other thing: if you create a @code{bzip2} binary for public
-distribution, please try and link it statically (@code{gcc -s}). This
-avoids all sorts of library-version issues that others may encounter
-later on.
-
-If you build @code{bzip2} on Win32, you must set @code{BZ_UNIX} to 0 and
-@code{BZ_LCCWIN32} to 1, in the file @code{bzip2.c}, before compiling.
-Otherwise the resulting binary won't work correctly.
-
-
-
-@section Reporting bugs
-I tried pretty hard to make sure @code{bzip2} is
-bug free, both by design and by testing. Hopefully
-you'll never need to read this section for real.
-
-Nevertheless, if @code{bzip2} dies with a segmentation
-fault, a bus error or an internal assertion failure, it
-will ask you to email me a bug report. Experience with
-version 0.1 shows that almost all these problems can
-be traced to either compiler bugs or hardware problems.
-@itemize @bullet
-@item
-Recompile the program with no optimisation, and see if it
-works. And/or try a different compiler.
-I heard all sorts of stories about various flavours
-of GNU C (and other compilers) generating bad code for
-@code{bzip2}, and I've run across two such examples myself.
-
-2.7.X versions of GNU C are known to generate bad code from
-time to time, at high optimisation levels.
-If you get problems, try using the flags
-@code{-O2} @code{-fomit-frame-pointer} @code{-fno-strength-reduce}.
-You should specifically @emph{not} use @code{-funroll-loops}.
-
-You may notice that the Makefile runs six tests as part of
-the build process. If the program passes all of these, it's
-a pretty good (but not 100%) indication that the compiler has
-done its job correctly.
-@item
-If @code{bzip2} crashes randomly, and the crashes are not
-repeatable, you may have a flaky memory subsystem. @code{bzip2}
-really hammers your memory hierarchy, and if it's a bit marginal,
-you may get these problems. Ditto if your disk or I/O subsystem
-is slowly failing. Yup, this really does happen.
-
-Try using a different machine of the same type, and see if
-you can repeat the problem.
-@item This isn't really a bug, but ... If @code{bzip2} tells
-you your file is corrupted on decompression, and you
-obtained the file via FTP, there is a possibility that you
-forgot to tell FTP to do a binary mode transfer. That absolutely
-will cause the file to be non-decompressible. You'll have to transfer
-it again.
-@end itemize
-
-If you've incorporated @code{libbzip2} into your own program
-and are getting problems, please, please, please, check that the
-parameters you are passing in calls to the library, are
-correct, and in accordance with what the documentation says
-is allowable. I have tried to make the library robust against
-such problems, but I'm sure I haven't succeeded.
-
-Finally, if the above comments don't help, you'll have to send
-me a bug report. Now, it's just amazing how many people will
-send me a bug report saying something like
-@display
- bzip2 crashed with segmentation fault on my machine
-@end display
-and absolutely nothing else. Needless to say, a such a report
-is @emph{totally, utterly, completely and comprehensively 100% useless;
-a waste of your time, my time, and net bandwidth}.
-With no details at all, there's no way I can possibly begin
-to figure out what the problem is.
-
-The rules of the game are: facts, facts, facts. Don't omit
-them because "oh, they won't be relevant". At the bare
-minimum:
-@display
- Machine type. Operating system version.
- Exact version of @code{bzip2} (do @code{bzip2 -V}).
- Exact version of the compiler used.
- Flags passed to the compiler.
-@end display
-However, the most important single thing that will help me is
-the file that you were trying to compress or decompress at the
-time the problem happened. Without that, my ability to do anything
-more than speculate about the cause, is limited.
-
-Please remember that I connect to the Internet with a modem, so
-you should contact me before mailing me huge files.
-
-
-@section Did you get the right package?
-
-@code{bzip2} is a resource hog. It soaks up large amounts of CPU cycles
-and memory. Also, it gives very large latencies. In the worst case, you
-can feed many megabytes of uncompressed data into the library before
-getting any compressed output, so this probably rules out applications
-requiring interactive behaviour.
-
-These aren't faults of my implementation, I hope, but more
-an intrinsic property of the Burrows-Wheeler transform (unfortunately).
-Maybe this isn't what you want.
-
-If you want a compressor and/or library which is faster, uses less
-memory but gets pretty good compression, and has minimal latency,
-consider Jean-loup
-Gailly's and Mark Adler's work, @code{zlib-1.1.2} and
-@code{gzip-1.2.4}. Look for them at
-
-@code{http://www.cdrom.com/pub/infozip/zlib} and
-@code{http://www.gzip.org} respectively.
-
-For something faster and lighter still, you might try Markus F X J
-Oberhumer's @code{LZO} real-time compression/decompression library, at
-@* @code{http://wildsau.idv.uni-linz.ac.at/mfx/lzo.html}.
-
-If you want to use the @code{bzip2} algorithms to compress small blocks
-of data, 64k bytes or smaller, for example on an on-the-fly disk
-compressor, you'd be well advised not to use this library. Instead,
-I've made a special library tuned for that kind of use. It's part of
-@code{e2compr-0.40}, an on-the-fly disk compressor for the Linux
-@code{ext2} filesystem. Look at
-@code{http://www.netspace.net.au/~reiter/e2compr}.
-
-
-
-@section Testing
-
-A record of the tests I've done.
-
-First, some data sets:
-@itemize @bullet
-@item B: a directory containing 6001 files, one for every length in the
- range 0 to 6000 bytes. The files contain random lowercase
- letters. 18.7 megabytes.
-@item H: my home directory tree. Documents, source code, mail files,
- compressed data. H contains B, and also a directory of
- files designed as boundary cases for the sorting; mostly very
- repetitive, nasty files. 565 megabytes.
-@item A: directory tree holding various applications built from source:
- @code{egcs}, @code{gcc-2.8.1}, KDE, GTK, Octave, etc.
- 2200 megabytes.
-@end itemize
-The tests conducted are as follows. Each test means compressing
-(a copy of) each file in the data set, decompressing it and
-comparing it against the original.
-
-First, a bunch of tests with block sizes and internal buffer
-sizes set very small,
-to detect any problems with the
-blocking and buffering mechanisms.
-This required modifying the source code so as to try to
-break it.
-@enumerate
-@item Data set H, with
- buffer size of 1 byte, and block size of 23 bytes.
-@item Data set B, buffer sizes 1 byte, block size 1 byte.
-@item As (2) but small-mode decompression.
-@item As (2) with block size 2 bytes.
-@item As (2) with block size 3 bytes.
-@item As (2) with block size 4 bytes.
-@item As (2) with block size 5 bytes.
-@item As (2) with block size 6 bytes and small-mode decompression.
-@item H with buffer size of 1 byte, but normal block
- size (up to 900000 bytes).
-@end enumerate
-Then some tests with unmodified source code.
-@enumerate
-@item H, all settings normal.
-@item As (1), with small-mode decompress.
-@item H, compress with flag @code{-1}.
-@item H, compress with flag @code{-s}, decompress with flag @code{-s}.
-@item Forwards compatibility: H, @code{bzip2-0.1pl2} compressing,
- @code{bzip2-0.9.5} decompressing, all settings normal.
-@item Backwards compatibility: H, @code{bzip2-0.9.5} compressing,
- @code{bzip2-0.1pl2} decompressing, all settings normal.
-@item Bigger tests: A, all settings normal.
-@item As (7), using the fallback (Sadakane-like) sorting algorithm.
-@item As (8), compress with flag @code{-1}, decompress with flag
- @code{-s}.
-@item H, using the fallback sorting algorithm.
-@item Forwards compatibility: A, @code{bzip2-0.1pl2} compressing,
- @code{bzip2-0.9.5} decompressing, all settings normal.
-@item Backwards compatibility: A, @code{bzip2-0.9.5} compressing,
- @code{bzip2-0.1pl2} decompressing, all settings normal.
-@item Misc test: about 400 megabytes of @code{.tar} files with
- @code{bzip2} compiled with Checker (a memory access error
- detector, like Purify).
-@item Misc tests to make sure it builds and runs ok on non-Linux/x86
- platforms.
-@end enumerate
-These tests were conducted on a 225 MHz IDT WinChip machine, running
-Linux 2.0.36. They represent nearly a week of continuous computation.
-All tests completed successfully.
-
-
-@section Further reading
-@code{bzip2} is not research work, in the sense that it doesn't present
-any new ideas. Rather, it's an engineering exercise based on existing
-ideas.
-
-Four documents describe essentially all the ideas behind @code{bzip2}:
-@example
-Michael Burrows and D. J. Wheeler:
- "A block-sorting lossless data compression algorithm"
- 10th May 1994.
- Digital SRC Research Report 124.
- ftp://ftp.digital.com/pub/DEC/SRC/research-reports/SRC-124.ps.gz
- If you have trouble finding it, try searching at the
- New Zealand Digital Library, http://www.nzdl.org.
-
-Daniel S. Hirschberg and Debra A. LeLewer
- "Efficient Decoding of Prefix Codes"
- Communications of the ACM, April 1990, Vol 33, Number 4.
- You might be able to get an electronic copy of this
- from the ACM Digital Library.
-
-David J. Wheeler
- Program bred3.c and accompanying document bred3.ps.
- This contains the idea behind the multi-table Huffman
- coding scheme.
- ftp://ftp.cl.cam.ac.uk/users/djw3/
-
-Jon L. Bentley and Robert Sedgewick
- "Fast Algorithms for Sorting and Searching Strings"
- Available from Sedgewick's web page,
- www.cs.princeton.edu/~rs
-@end example
-The following paper gives valuable additional insights into the
-algorithm, but is not immediately the basis of any code
-used in bzip2.
-@example
-Peter Fenwick:
- Block Sorting Text Compression
- Proceedings of the 19th Australasian Computer Science Conference,
- Melbourne, Australia. Jan 31 - Feb 2, 1996.
- ftp://ftp.cs.auckland.ac.nz/pub/peter-f/ACSC96paper.ps
-@end example
-Kunihiko Sadakane's sorting algorithm, mentioned above,
-is available from:
-@example
-http://naomi.is.s.u-tokyo.ac.jp/~sada/papers/Sada98b.ps.gz
-@end example
-The Manber-Myers suffix array construction
-algorithm is described in a paper
-available from:
-@example
-http://www.cs.arizona.edu/people/gene/PAPERS/suffix.ps
-@end example
-Finally, the following paper documents some recent investigations
-I made into the performance of sorting algorithms:
-@example
-Julian Seward:
- On the Performance of BWT Sorting Algorithms
- Proceedings of the IEEE Data Compression Conference 2000
- Snowbird, Utah. 28-30 March 2000.
-@end example
-
-
-@contents
-
-@bye
-
+++ /dev/null
-<HTML>
-<HEAD>
-<!-- This HTML file has been created by texi2html 1.54
- from manual.texi on 23 March 2000 -->
-
-<TITLE>bzip2 and libbzip2 - Introduction</TITLE>
-<link href="manual_2.html" rel=Next>
-<link href="manual_toc.html" rel=ToC>
-
-</HEAD>
-<BODY>
-<p>Go to the first, previous, <A HREF="manual_2.html">next</A>, <A HREF="manual_4.html">last</A> section, <A HREF="manual_toc.html">table of contents</A>.
-<P><HR><P>
-
-
-<H1><A NAME="SEC1" HREF="manual_toc.html#TOC1">Introduction</A></H1>
-
-<P>
-<CODE>bzip2</CODE> compresses files using the Burrows-Wheeler
-block-sorting text compression algorithm, and Huffman coding.
-Compression is generally considerably better than that
-achieved by more conventional LZ77/LZ78-based compressors,
-and approaches the performance of the PPM family of statistical compressors.
-
-</P>
-<P>
-<CODE>bzip2</CODE> is built on top of <CODE>libbzip2</CODE>, a flexible library
-for handling compressed data in the <CODE>bzip2</CODE> format. This manual
-describes both how to use the program and
-how to work with the library interface. Most of the
-manual is devoted to this library, not the program,
-which is good news if your interest is only in the program.
-
-</P>
-<P>
-Chapter 2 describes how to use <CODE>bzip2</CODE>; this is the only part
-you need to read if you just want to know how to operate the program.
-Chapter 3 describes the programming interfaces in detail, and
-Chapter 4 records some miscellaneous notes which I thought
-ought to be recorded somewhere.
-
-</P>
-
-<P><HR><P>
-<p>Go to the first, previous, <A HREF="manual_2.html">next</A>, <A HREF="manual_4.html">last</A> section, <A HREF="manual_toc.html">table of contents</A>.
-</BODY>
-</HTML>
+++ /dev/null
-<HTML>
-<HEAD>
-<!-- This HTML file has been created by texi2html 1.54
- from manual.texi on 23 March 2000 -->
-
-<TITLE>bzip2 and libbzip2 - How to use bzip2</TITLE>
-<link href="manual_3.html" rel=Next>
-<link href="manual_1.html" rel=Previous>
-<link href="manual_toc.html" rel=ToC>
-
-</HEAD>
-<BODY>
-<p>Go to the <A HREF="manual_1.html">first</A>, <A HREF="manual_1.html">previous</A>, <A HREF="manual_3.html">next</A>, <A HREF="manual_4.html">last</A> section, <A HREF="manual_toc.html">table of contents</A>.
-<P><HR><P>
-
-
-<H1><A NAME="SEC2" HREF="manual_toc.html#TOC2">How to use <CODE>bzip2</CODE></A></H1>
-
-<P>
-This chapter contains a copy of the <CODE>bzip2</CODE> man page,
-and nothing else.
-
-</P>
-
-<BLOCKQUOTE>
-
-
-
-<H4><A NAME="SEC3" HREF="manual_toc.html#TOC3">NAME</A></H4>
-
-<UL>
-<LI><CODE>bzip2</CODE>, <CODE>bunzip2</CODE>
-
-- a block-sorting file compressor, v1.0
-<LI><CODE>bzcat</CODE>
-
-- decompresses files to stdout
-<LI><CODE>bzip2recover</CODE>
-
-- recovers data from damaged bzip2 files
-</UL>
-
-
-
-<H4><A NAME="SEC4" HREF="manual_toc.html#TOC4">SYNOPSIS</A></H4>
-
-<UL>
-<LI><CODE>bzip2</CODE> [ -cdfkqstvzVL123456789 ] [ filenames ... ]
-
-<LI><CODE>bunzip2</CODE> [ -fkvsVL ] [ filenames ... ]
-
-<LI><CODE>bzcat</CODE> [ -s ] [ filenames ... ]
-
-<LI><CODE>bzip2recover</CODE> filename
-
-</UL>
-
-
-
-<H4><A NAME="SEC5" HREF="manual_toc.html#TOC5">DESCRIPTION</A></H4>
-
-<P>
-<CODE>bzip2</CODE> compresses files using the Burrows-Wheeler block sorting
-text compression algorithm, and Huffman coding. Compression is
-generally considerably better than that achieved by more conventional
-LZ77/LZ78-based compressors, and approaches the performance of the PPM
-family of statistical compressors.
-
-</P>
-<P>
-The command-line options are deliberately very similar to those of GNU
-<CODE>gzip</CODE>, but they are not identical.
-
-</P>
-<P>
-<CODE>bzip2</CODE> expects a list of file names to accompany the command-line
-flags. Each file is replaced by a compressed version of itself, with
-the name <CODE>original_name.bz2</CODE>. Each compressed file has the same
-modification date, permissions, and, when possible, ownership as the
-corresponding original, so that these properties can be correctly
-restored at decompression time. File name handling is naive in the
-sense that there is no mechanism for preserving original file names,
-permissions, ownerships or dates in filesystems which lack these
-concepts, or have serious file name length restrictions, such as MS-DOS.
-
-</P>
-<P>
-<CODE>bzip2</CODE> and <CODE>bunzip2</CODE> will by default not overwrite existing
-files. If you want this to happen, specify the <CODE>-f</CODE> flag.
-
-</P>
-<P>
-If no file names are specified, <CODE>bzip2</CODE> compresses from standard
-input to standard output. In this case, <CODE>bzip2</CODE> will decline to
-write compressed output to a terminal, as this would be entirely
-incomprehensible and therefore pointless.
-
-</P>
-<P>
-<CODE>bunzip2</CODE> (or <CODE>bzip2 -d</CODE>) decompresses all
-specified files. Files which were not created by <CODE>bzip2</CODE>
-will be detected and ignored, and a warning issued.
-<CODE>bzip2</CODE> attempts to guess the filename for the decompressed file
-from that of the compressed file as follows:
-
-<UL>
-<LI><CODE>filename.bz2 </CODE> becomes <CODE>filename</CODE>
-
-<LI><CODE>filename.bz </CODE> becomes <CODE>filename</CODE>
-
-<LI><CODE>filename.tbz2</CODE> becomes <CODE>filename.tar</CODE>
-
-<LI><CODE>filename.tbz </CODE> becomes <CODE>filename.tar</CODE>
-
-<LI><CODE>anyothername </CODE> becomes <CODE>anyothername.out</CODE>
-
-</UL>
-
-<P>
-If the file does not end in one of the recognised endings,
-<CODE>.bz2</CODE>, <CODE>.bz</CODE>,
-<CODE>.tbz2</CODE> or <CODE>.tbz</CODE>, <CODE>bzip2</CODE> complains that it cannot
-guess the name of the original file, and uses the original name
-with <CODE>.out</CODE> appended.
-
-</P>
-<P>
-As with compression, supplying no
-filenames causes decompression from standard input to standard output.
-
-</P>
-<P>
-<CODE>bunzip2</CODE> will correctly decompress a file which is the
-concatenation of two or more compressed files. The result is the
-concatenation of the corresponding uncompressed files. Integrity
-testing (<CODE>-t</CODE>) of concatenated compressed files is also supported.
-
-</P>
-<P>
-You can also compress or decompress files to the standard output by
-giving the <CODE>-c</CODE> flag. Multiple files may be compressed and
-decompressed like this. The resulting outputs are fed sequentially to
-stdout. Compression of multiple files in this manner generates a stream
-containing multiple compressed file representations. Such a stream
-can be decompressed correctly only by <CODE>bzip2</CODE> version 0.9.0 or
-later. Earlier versions of <CODE>bzip2</CODE> will stop after decompressing
-the first file in the stream.
-
-</P>
-<P>
-<CODE>bzcat</CODE> (or <CODE>bzip2 -dc</CODE>) decompresses all specified files to
-the standard output.
-
-</P>
-<P>
-<CODE>bzip2</CODE> will read arguments from the environment variables
-<CODE>BZIP2</CODE> and <CODE>BZIP</CODE>, in that order, and will process them
-before any arguments read from the command line. This gives a
-convenient way to supply default arguments.
-
-</P>
-<P>
-Compression is always performed, even if the compressed file is slightly
-larger than the original. Files of less than about one hundred bytes
-tend to get larger, since the compression mechanism has a constant
-overhead in the region of 50 bytes. Random data (including the output
-of most file compressors) is coded at about 8.05 bits per byte, giving
-an expansion of around 0.5%.
-
-</P>
-<P>
-As a self-check for your protection, <CODE>bzip2</CODE> uses 32-bit CRCs to
-make sure that the decompressed version of a file is identical to the
-original. This guards against corruption of the compressed data, and
-against undetected bugs in <CODE>bzip2</CODE> (hopefully very unlikely). The
-chances of data corruption going undetected is microscopic, about one
-chance in four billion for each file processed. Be aware, though, that
-the check occurs upon decompression, so it can only tell you that
-something is wrong. It can't help you recover the original uncompressed
-data. You can use <CODE>bzip2recover</CODE> to try to recover data from
-damaged files.
-
-</P>
-<P>
-Return values: 0 for a normal exit, 1 for environmental problems (file
-not found, invalid flags, I/O errors, &c), 2 to indicate a corrupt
-compressed file, 3 for an internal consistency error (eg, bug) which
-caused <CODE>bzip2</CODE> to panic.
-
-</P>
-
-
-
-<H4><A NAME="SEC6" HREF="manual_toc.html#TOC6">OPTIONS</A></H4>
-<DL COMPACT>
-
-<DT><CODE>-c --stdout</CODE>
-<DD>
-Compress or decompress to standard output.
-<DT><CODE>-d --decompress</CODE>
-<DD>
-Force decompression. <CODE>bzip2</CODE>, <CODE>bunzip2</CODE> and <CODE>bzcat</CODE> are
-really the same program, and the decision about what actions to take is
-done on the basis of which name is used. This flag overrides that
-mechanism, and forces bzip2 to decompress.
-<DT><CODE>-z --compress</CODE>
-<DD>
-The complement to <CODE>-d</CODE>: forces compression, regardless of the
-invokation name.
-<DT><CODE>-t --test</CODE>
-<DD>
-Check integrity of the specified file(s), but don't decompress them.
-This really performs a trial decompression and throws away the result.
-<DT><CODE>-f --force</CODE>
-<DD>
-Force overwrite of output files. Normally, <CODE>bzip2</CODE> will not overwrite
-existing output files. Also forces <CODE>bzip2</CODE> to break hard links
-to files, which it otherwise wouldn't do.
-<DT><CODE>-k --keep</CODE>
-<DD>
-Keep (don't delete) input files during compression
-or decompression.
-<DT><CODE>-s --small</CODE>
-<DD>
-Reduce memory usage, for compression, decompression and testing. Files
-are decompressed and tested using a modified algorithm which only
-requires 2.5 bytes per block byte. This means any file can be
-decompressed in 2300k of memory, albeit at about half the normal speed.
-
-During compression, <CODE>-s</CODE> selects a block size of 200k, which limits
-memory use to around the same figure, at the expense of your compression
-ratio. In short, if your machine is low on memory (8 megabytes or
-less), use -s for everything. See MEMORY MANAGEMENT below.
-<DT><CODE>-q --quiet</CODE>
-<DD>
-Suppress non-essential warning messages. Messages pertaining to
-I/O errors and other critical events will not be suppressed.
-<DT><CODE>-v --verbose</CODE>
-<DD>
-Verbose mode -- show the compression ratio for each file processed.
-Further <CODE>-v</CODE>'s increase the verbosity level, spewing out lots of
-information which is primarily of interest for diagnostic purposes.
-<DT><CODE>-L --license -V --version</CODE>
-<DD>
-Display the software version, license terms and conditions.
-<DT><CODE>-1 to -9</CODE>
-<DD>
-Set the block size to 100 k, 200 k .. 900 k when compressing. Has no
-effect when decompressing. See MEMORY MANAGEMENT below.
-<DT><CODE>--</CODE>
-<DD>
-Treats all subsequent arguments as file names, even if they start
-with a dash. This is so you can handle files with names beginning
-with a dash, for example: <CODE>bzip2 -- -myfilename</CODE>.
-<DT><CODE>--repetitive-fast</CODE>
-<DD>
-<DT><CODE>--repetitive-best</CODE>
-<DD>
-These flags are redundant in versions 0.9.5 and above. They provided
-some coarse control over the behaviour of the sorting algorithm in
-earlier versions, which was sometimes useful. 0.9.5 and above have an
-improved algorithm which renders these flags irrelevant.
-</DL>
-
-
-
-<H4><A NAME="SEC7" HREF="manual_toc.html#TOC7">MEMORY MANAGEMENT</A></H4>
-
-<P>
-<CODE>bzip2</CODE> compresses large files in blocks. The block size affects
-both the compression ratio achieved, and the amount of memory needed for
-compression and decompression. The flags <CODE>-1</CODE> through <CODE>-9</CODE>
-specify the block size to be 100,000 bytes through 900,000 bytes (the
-default) respectively. At decompression time, the block size used for
-compression is read from the header of the compressed file, and
-<CODE>bunzip2</CODE> then allocates itself just enough memory to decompress
-the file. Since block sizes are stored in compressed files, it follows
-that the flags <CODE>-1</CODE> to <CODE>-9</CODE> are irrelevant to and so ignored
-during decompression.
-
-</P>
-<P>
-Compression and decompression requirements, in bytes, can be estimated
-as:
-
-<PRE>
- Compression: 400k + ( 8 x block size )
-
- Decompression: 100k + ( 4 x block size ), or
- 100k + ( 2.5 x block size )
-</PRE>
-
-<P>
-Larger block sizes give rapidly diminishing marginal returns. Most of
-the compression comes from the first two or three hundred k of block
-size, a fact worth bearing in mind when using <CODE>bzip2</CODE> on small machines.
-It is also important to appreciate that the decompression memory
-requirement is set at compression time by the choice of block size.
-
-</P>
-<P>
-For files compressed with the default 900k block size, <CODE>bunzip2</CODE>
-will require about 3700 kbytes to decompress. To support decompression
-of any file on a 4 megabyte machine, <CODE>bunzip2</CODE> has an option to
-decompress using approximately half this amount of memory, about 2300
-kbytes. Decompression speed is also halved, so you should use this
-option only where necessary. The relevant flag is <CODE>-s</CODE>.
-
-</P>
-<P>
-In general, try and use the largest block size memory constraints allow,
-since that maximises the compression achieved. Compression and
-decompression speed are virtually unaffected by block size.
-
-</P>
-<P>
-Another significant point applies to files which fit in a single block
--- that means most files you'd encounter using a large block size. The
-amount of real memory touched is proportional to the size of the file,
-since the file is smaller than a block. For example, compressing a file
-20,000 bytes long with the flag <CODE>-9</CODE> will cause the compressor to
-allocate around 7600k of memory, but only touch 400k + 20000 * 8 = 560
-kbytes of it. Similarly, the decompressor will allocate 3700k but only
-touch 100k + 20000 * 4 = 180 kbytes.
-
-</P>
-<P>
-Here is a table which summarises the maximum memory usage for different
-block sizes. Also recorded is the total compressed size for 14 files of
-the Calgary Text Compression Corpus totalling 3,141,622 bytes. This
-column gives some feel for how compression varies with block size.
-These figures tend to understate the advantage of larger block sizes for
-larger files, since the Corpus is dominated by smaller files.
-
-<PRE>
- Compress Decompress Decompress Corpus
- Flag usage usage -s usage Size
-
- -1 1200k 500k 350k 914704
- -2 2000k 900k 600k 877703
- -3 2800k 1300k 850k 860338
- -4 3600k 1700k 1100k 846899
- -5 4400k 2100k 1350k 845160
- -6 5200k 2500k 1600k 838626
- -7 6100k 2900k 1850k 834096
- -8 6800k 3300k 2100k 828642
- -9 7600k 3700k 2350k 828642
-</PRE>
-
-
-
-<H4><A NAME="SEC8" HREF="manual_toc.html#TOC8">RECOVERING DATA FROM DAMAGED FILES</A></H4>
-
-<P>
-<CODE>bzip2</CODE> compresses files in blocks, usually 900kbytes long. Each
-block is handled independently. If a media or transmission error causes
-a multi-block <CODE>.bz2</CODE> file to become damaged, it may be possible to
-recover data from the undamaged blocks in the file.
-
-</P>
-<P>
-The compressed representation of each block is delimited by a 48-bit
-pattern, which makes it possible to find the block boundaries with
-reasonable certainty. Each block also carries its own 32-bit CRC, so
-damaged blocks can be distinguished from undamaged ones.
-
-</P>
-<P>
-<CODE>bzip2recover</CODE> is a simple program whose purpose is to search for
-blocks in <CODE>.bz2</CODE> files, and write each block out into its own
-<CODE>.bz2</CODE> file. You can then use <CODE>bzip2 -t</CODE> to test the
-integrity of the resulting files, and decompress those which are
-undamaged.
-
-</P>
-<P>
-<CODE>bzip2recover</CODE>
-takes a single argument, the name of the damaged file,
-and writes a number of files <CODE>rec0001file.bz2</CODE>,
- <CODE>rec0002file.bz2</CODE>, etc, containing the extracted blocks.
- The output filenames are designed so that the use of
- wildcards in subsequent processing -- for example,
-<CODE>bzip2 -dc rec*file.bz2 > recovered_data</CODE> -- lists the files in
- the correct order.
-
-</P>
-<P>
-<CODE>bzip2recover</CODE> should be of most use dealing with large <CODE>.bz2</CODE>
- files, as these will contain many blocks. It is clearly
- futile to use it on damaged single-block files, since a
- damaged block cannot be recovered. If you wish to minimise
-any potential data loss through media or transmission errors,
-you might consider compressing with a smaller
- block size.
-
-</P>
-
-
-
-<H4><A NAME="SEC9" HREF="manual_toc.html#TOC9">PERFORMANCE NOTES</A></H4>
-
-<P>
-The sorting phase of compression gathers together similar strings in the
-file. Because of this, files containing very long runs of repeated
-symbols, like "aabaabaabaab ..." (repeated several hundred times) may
-compress more slowly than normal. Versions 0.9.5 and above fare much
-better than previous versions in this respect. The ratio between
-worst-case and average-case compression time is in the region of 10:1.
-For previous versions, this figure was more like 100:1. You can use the
-<CODE>-vvvv</CODE> option to monitor progress in great detail, if you want.
-
-</P>
-<P>
-Decompression speed is unaffected by these phenomena.
-
-</P>
-<P>
-<CODE>bzip2</CODE> usually allocates several megabytes of memory to operate
-in, and then charges all over it in a fairly random fashion. This means
-that performance, both for compressing and decompressing, is largely
-determined by the speed at which your machine can service cache misses.
-Because of this, small changes to the code to reduce the miss rate have
-been observed to give disproportionately large performance improvements.
-I imagine <CODE>bzip2</CODE> will perform best on machines with very large
-caches.
-
-</P>
-
-
-
-<H4><A NAME="SEC10" HREF="manual_toc.html#TOC10">CAVEATS</A></H4>
-
-<P>
-I/O error messages are not as helpful as they could be. <CODE>bzip2</CODE>
-tries hard to detect I/O errors and exit cleanly, but the details of
-what the problem is sometimes seem rather misleading.
-
-</P>
-<P>
-This manual page pertains to version 1.0 of <CODE>bzip2</CODE>. Compressed
-data created by this version is entirely forwards and backwards
-compatible with the previous public releases, versions 0.1pl2, 0.9.0 and
-0.9.5, but with the following exception: 0.9.0 and above can correctly
-decompress multiple concatenated compressed files. 0.1pl2 cannot do
-this; it will stop after decompressing just the first file in the
-stream.
-
-</P>
-<P>
-<CODE>bzip2recover</CODE> uses 32-bit integers to represent bit positions in
-compressed files, so it cannot handle compressed files more than 512
-megabytes long. This could easily be fixed.
-
-</P>
-
-
-
-<H4><A NAME="SEC11" HREF="manual_toc.html#TOC11">AUTHOR</A></H4>
-<P>
-Julian Seward, <CODE>jseward@acm.org</CODE>.
-
-</P>
-<P>
-The ideas embodied in <CODE>bzip2</CODE> are due to (at least) the following
-people: Michael Burrows and David Wheeler (for the block sorting
-transformation), David Wheeler (again, for the Huffman coder), Peter
-Fenwick (for the structured coding model in the original <CODE>bzip</CODE>,
-and many refinements), and Alistair Moffat, Radford Neal and Ian Witten
-(for the arithmetic coder in the original <CODE>bzip</CODE>). I am much
-indebted for their help, support and advice. See the manual in the
-source distribution for pointers to sources of documentation. Christian
-von Roques encouraged me to look for faster sorting algorithms, so as to
-speed up compression. Bela Lubkin encouraged me to improve the
-worst-case compression performance. Many people sent patches, helped
-with portability problems, lent machines, gave advice and were generally
-helpful.
-
-</P>
-</BLOCKQUOTE>
-
-<P><HR><P>
-<p>Go to the <A HREF="manual_1.html">first</A>, <A HREF="manual_1.html">previous</A>, <A HREF="manual_3.html">next</A>, <A HREF="manual_4.html">last</A> section, <A HREF="manual_toc.html">table of contents</A>.
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-</HTML>
+++ /dev/null
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-<HEAD>
-<!-- This HTML file has been created by texi2html 1.54
- from manual.texi on 23 March 2000 -->
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-<TITLE>bzip2 and libbzip2 - Programming with libbzip2</TITLE>
-<link href="manual_4.html" rel=Next>
-<link href="manual_2.html" rel=Previous>
-<link href="manual_toc.html" rel=ToC>
-
-</HEAD>
-<BODY>
-<p>Go to the <A HREF="manual_1.html">first</A>, <A HREF="manual_2.html">previous</A>, <A HREF="manual_4.html">next</A>, <A HREF="manual_4.html">last</A> section, <A HREF="manual_toc.html">table of contents</A>.
-<P><HR><P>
-
-
-<H1><A NAME="SEC12" HREF="manual_toc.html#TOC12">Programming with <CODE>libbzip2</CODE></A></H1>
-
-<P>
-This chapter describes the programming interface to <CODE>libbzip2</CODE>.
-
-</P>
-<P>
-For general background information, particularly about memory
-use and performance aspects, you'd be well advised to read Chapter 2
-as well.
-
-</P>
-
-
-<H2><A NAME="SEC13" HREF="manual_toc.html#TOC13">Top-level structure</A></H2>
-
-<P>
-<CODE>libbzip2</CODE> is a flexible library for compressing and decompressing
-data in the <CODE>bzip2</CODE> data format. Although packaged as a single
-entity, it helps to regard the library as three separate parts: the low
-level interface, and the high level interface, and some utility
-functions.
-
-</P>
-<P>
-The structure of <CODE>libbzip2</CODE>'s interfaces is similar to
-that of Jean-loup Gailly's and Mark Adler's excellent <CODE>zlib</CODE>
-library.
-
-</P>
-<P>
-All externally visible symbols have names beginning <CODE>BZ2_</CODE>.
-This is new in version 1.0. The intention is to minimise pollution
-of the namespaces of library clients.
-
-</P>
-
-
-<H3><A NAME="SEC14" HREF="manual_toc.html#TOC14">Low-level summary</A></H3>
-
-<P>
-This interface provides services for compressing and decompressing
-data in memory. There's no provision for dealing with files, streams
-or any other I/O mechanisms, just straight memory-to-memory work.
-In fact, this part of the library can be compiled without inclusion
-of <CODE>stdio.h</CODE>, which may be helpful for embedded applications.
-
-</P>
-<P>
-The low-level part of the library has no global variables and
-is therefore thread-safe.
-
-</P>
-<P>
-Six routines make up the low level interface:
-<CODE>BZ2_bzCompressInit</CODE>, <CODE>BZ2_bzCompress</CODE>, and <BR> <CODE>BZ2_bzCompressEnd</CODE>
-for compression,
-and a corresponding trio <CODE>BZ2_bzDecompressInit</CODE>, <BR> <CODE>BZ2_bzDecompress</CODE>
-and <CODE>BZ2_bzDecompressEnd</CODE> for decompression.
-The <CODE>*Init</CODE> functions allocate
-memory for compression/decompression and do other
-initialisations, whilst the <CODE>*End</CODE> functions close down operations
-and release memory.
-
-</P>
-<P>
-The real work is done by <CODE>BZ2_bzCompress</CODE> and <CODE>BZ2_bzDecompress</CODE>.
-These compress and decompress data from a user-supplied input buffer
-to a user-supplied output buffer. These buffers can be any size;
-arbitrary quantities of data are handled by making repeated calls
-to these functions. This is a flexible mechanism allowing a
-consumer-pull style of activity, or producer-push, or a mixture of
-both.
-
-</P>
-
-
-
-<H3><A NAME="SEC15" HREF="manual_toc.html#TOC15">High-level summary</A></H3>
-
-<P>
-This interface provides some handy wrappers around the low-level
-interface to facilitate reading and writing <CODE>bzip2</CODE> format
-files (<CODE>.bz2</CODE> files). The routines provide hooks to facilitate
-reading files in which the <CODE>bzip2</CODE> data stream is embedded
-within some larger-scale file structure, or where there are
-multiple <CODE>bzip2</CODE> data streams concatenated end-to-end.
-
-</P>
-<P>
-For reading files, <CODE>BZ2_bzReadOpen</CODE>, <CODE>BZ2_bzRead</CODE>,
-<CODE>BZ2_bzReadClose</CODE> and <BR> <CODE>BZ2_bzReadGetUnused</CODE> are supplied. For
-writing files, <CODE>BZ2_bzWriteOpen</CODE>, <CODE>BZ2_bzWrite</CODE> and
-<CODE>BZ2_bzWriteFinish</CODE> are available.
-
-</P>
-<P>
-As with the low-level library, no global variables are used
-so the library is per se thread-safe. However, if I/O errors
-occur whilst reading or writing the underlying compressed files,
-you may have to consult <CODE>errno</CODE> to determine the cause of
-the error. In that case, you'd need a C library which correctly
-supports <CODE>errno</CODE> in a multithreaded environment.
-
-</P>
-<P>
-To make the library a little simpler and more portable,
-<CODE>BZ2_bzReadOpen</CODE> and <CODE>BZ2_bzWriteOpen</CODE> require you to pass them file
-handles (<CODE>FILE*</CODE>s) which have previously been opened for reading or
-writing respectively. That avoids portability problems associated with
-file operations and file attributes, whilst not being much of an
-imposition on the programmer.
-
-</P>
-
-
-
-<H3><A NAME="SEC16" HREF="manual_toc.html#TOC16">Utility functions summary</A></H3>
-<P>
-For very simple needs, <CODE>BZ2_bzBuffToBuffCompress</CODE> and
-<CODE>BZ2_bzBuffToBuffDecompress</CODE> are provided. These compress
-data in memory from one buffer to another buffer in a single
-function call. You should assess whether these functions
-fulfill your memory-to-memory compression/decompression
-requirements before investing effort in understanding the more
-general but more complex low-level interface.
-
-</P>
-<P>
-Yoshioka Tsuneo (<CODE>QWF00133@niftyserve.or.jp</CODE> /
-<CODE>tsuneo-y@is.aist-nara.ac.jp</CODE>) has contributed some functions to
-give better <CODE>zlib</CODE> compatibility. These functions are
-<CODE>BZ2_bzopen</CODE>, <CODE>BZ2_bzread</CODE>, <CODE>BZ2_bzwrite</CODE>, <CODE>BZ2_bzflush</CODE>,
-<CODE>BZ2_bzclose</CODE>,
-<CODE>BZ2_bzerror</CODE> and <CODE>BZ2_bzlibVersion</CODE>. You may find these functions
-more convenient for simple file reading and writing, than those in the
-high-level interface. These functions are not (yet) officially part of
-the library, and are minimally documented here. If they break, you
-get to keep all the pieces. I hope to document them properly when time
-permits.
-
-</P>
-<P>
-Yoshioka also contributed modifications to allow the library to be
-built as a Windows DLL.
-
-</P>
-
-
-
-<H2><A NAME="SEC17" HREF="manual_toc.html#TOC17">Error handling</A></H2>
-
-<P>
-The library is designed to recover cleanly in all situations, including
-the worst-case situation of decompressing random data. I'm not
-100% sure that it can always do this, so you might want to add
-a signal handler to catch segmentation violations during decompression
-if you are feeling especially paranoid. I would be interested in
-hearing more about the robustness of the library to corrupted
-compressed data.
-
-</P>
-<P>
-Version 1.0 is much more robust in this respect than
-0.9.0 or 0.9.5. Investigations with Checker (a tool for
-detecting problems with memory management, similar to Purify)
-indicate that, at least for the few files I tested, all single-bit
-errors in the decompressed data are caught properly, with no
-segmentation faults, no reads of uninitialised data and no
-out of range reads or writes. So it's certainly much improved,
-although I wouldn't claim it to be totally bombproof.
-
-</P>
-<P>
-The file <CODE>bzlib.h</CODE> contains all definitions needed to use
-the library. In particular, you should definitely not include
-<CODE>bzlib_private.h</CODE>.
-
-</P>
-<P>
-In <CODE>bzlib.h</CODE>, the various return values are defined. The following
-list is not intended as an exhaustive description of the circumstances
-in which a given value may be returned -- those descriptions are given
-later. Rather, it is intended to convey the rough meaning of each
-return value. The first five actions are normal and not intended to
-denote an error situation.
-<DL COMPACT>
-
-<DT><CODE>BZ_OK</CODE>
-<DD>
-The requested action was completed successfully.
-<DT><CODE>BZ_RUN_OK</CODE>
-<DD>
-<DT><CODE>BZ_FLUSH_OK</CODE>
-<DD>
-<DT><CODE>BZ_FINISH_OK</CODE>
-<DD>
-In <CODE>BZ2_bzCompress</CODE>, the requested flush/finish/nothing-special action
-was completed successfully.
-<DT><CODE>BZ_STREAM_END</CODE>
-<DD>
-Compression of data was completed, or the logical stream end was
-detected during decompression.
-</DL>
-
-<P>
-The following return values indicate an error of some kind.
-<DL COMPACT>
-
-<DT><CODE>BZ_CONFIG_ERROR</CODE>
-<DD>
-Indicates that the library has been improperly compiled on your
-platform -- a major configuration error. Specifically, it means
-that <CODE>sizeof(char)</CODE>, <CODE>sizeof(short)</CODE> and <CODE>sizeof(int)</CODE>
-are not 1, 2 and 4 respectively, as they should be. Note that the
-library should still work properly on 64-bit platforms which follow
-the LP64 programming model -- that is, where <CODE>sizeof(long)</CODE>
-and <CODE>sizeof(void*)</CODE> are 8. Under LP64, <CODE>sizeof(int)</CODE> is
-still 4, so <CODE>libbzip2</CODE>, which doesn't use the <CODE>long</CODE> type,
-is OK.
-<DT><CODE>BZ_SEQUENCE_ERROR</CODE>
-<DD>
-When using the library, it is important to call the functions in the
-correct sequence and with data structures (buffers etc) in the correct
-states. <CODE>libbzip2</CODE> checks as much as it can to ensure this is
-happening, and returns <CODE>BZ_SEQUENCE_ERROR</CODE> if not. Code which
-complies precisely with the function semantics, as detailed below,
-should never receive this value; such an event denotes buggy code
-which you should investigate.
-<DT><CODE>BZ_PARAM_ERROR</CODE>
-<DD>
-Returned when a parameter to a function call is out of range
-or otherwise manifestly incorrect. As with <CODE>BZ_SEQUENCE_ERROR</CODE>,
-this denotes a bug in the client code. The distinction between
-<CODE>BZ_PARAM_ERROR</CODE> and <CODE>BZ_SEQUENCE_ERROR</CODE> is a bit hazy, but still worth
-making.
-<DT><CODE>BZ_MEM_ERROR</CODE>
-<DD>
-Returned when a request to allocate memory failed. Note that the
-quantity of memory needed to decompress a stream cannot be determined
-until the stream's header has been read. So <CODE>BZ2_bzDecompress</CODE> and
-<CODE>BZ2_bzRead</CODE> may return <CODE>BZ_MEM_ERROR</CODE> even though some of
-the compressed data has been read. The same is not true for
-compression; once <CODE>BZ2_bzCompressInit</CODE> or <CODE>BZ2_bzWriteOpen</CODE> have
-successfully completed, <CODE>BZ_MEM_ERROR</CODE> cannot occur.
-<DT><CODE>BZ_DATA_ERROR</CODE>
-<DD>
-Returned when a data integrity error is detected during decompression.
-Most importantly, this means when stored and computed CRCs for the
-data do not match. This value is also returned upon detection of any
-other anomaly in the compressed data.
-<DT><CODE>BZ_DATA_ERROR_MAGIC</CODE>
-<DD>
-As a special case of <CODE>BZ_DATA_ERROR</CODE>, it is sometimes useful to
-know when the compressed stream does not start with the correct
-magic bytes (<CODE>'B' 'Z' 'h'</CODE>).
-<DT><CODE>BZ_IO_ERROR</CODE>
-<DD>
-Returned by <CODE>BZ2_bzRead</CODE> and <CODE>BZ2_bzWrite</CODE> when there is an error
-reading or writing in the compressed file, and by <CODE>BZ2_bzReadOpen</CODE>
-and <CODE>BZ2_bzWriteOpen</CODE> for attempts to use a file for which the
-error indicator (viz, <CODE>ferror(f)</CODE>) is set.
-On receipt of <CODE>BZ_IO_ERROR</CODE>, the caller should consult
-<CODE>errno</CODE> and/or <CODE>perror</CODE> to acquire operating-system
-specific information about the problem.
-<DT><CODE>BZ_UNEXPECTED_EOF</CODE>
-<DD>
-Returned by <CODE>BZ2_bzRead</CODE> when the compressed file finishes
-before the logical end of stream is detected.
-<DT><CODE>BZ_OUTBUFF_FULL</CODE>
-<DD>
-Returned by <CODE>BZ2_bzBuffToBuffCompress</CODE> and
-<CODE>BZ2_bzBuffToBuffDecompress</CODE> to indicate that the output data
-will not fit into the output buffer provided.
-</DL>
-
-
-
-<H2><A NAME="SEC18" HREF="manual_toc.html#TOC18">Low-level interface</A></H2>
-
-
-
-<H3><A NAME="SEC19" HREF="manual_toc.html#TOC19"><CODE>BZ2_bzCompressInit</CODE></A></H3>
-
-<PRE>
-typedef
- struct {
- char *next_in;
- unsigned int avail_in;
- unsigned int total_in_lo32;
- unsigned int total_in_hi32;
-
- char *next_out;
- unsigned int avail_out;
- unsigned int total_out_lo32;
- unsigned int total_out_hi32;
-
- void *state;
-
- void *(*bzalloc)(void *,int,int);
- void (*bzfree)(void *,void *);
- void *opaque;
- }
- bz_stream;
-
-int BZ2_bzCompressInit ( bz_stream *strm,
- int blockSize100k,
- int verbosity,
- int workFactor );
-
-</PRE>
-
-<P>
-Prepares for compression. The <CODE>bz_stream</CODE> structure
-holds all data pertaining to the compression activity.
-A <CODE>bz_stream</CODE> structure should be allocated and initialised
-prior to the call.
-The fields of <CODE>bz_stream</CODE>
-comprise the entirety of the user-visible data. <CODE>state</CODE>
-is a pointer to the private data structures required for compression.
-
-</P>
-<P>
-Custom memory allocators are supported, via fields <CODE>bzalloc</CODE>,
-<CODE>bzfree</CODE>,
-and <CODE>opaque</CODE>. The value
-<CODE>opaque</CODE> is passed to as the first argument to
-all calls to <CODE>bzalloc</CODE> and <CODE>bzfree</CODE>, but is
-otherwise ignored by the library.
-The call <CODE>bzalloc ( opaque, n, m )</CODE> is expected to return a
-pointer <CODE>p</CODE> to
-<CODE>n * m</CODE> bytes of memory, and <CODE>bzfree ( opaque, p )</CODE>
-should free
-that memory.
-
-</P>
-<P>
-If you don't want to use a custom memory allocator, set <CODE>bzalloc</CODE>,
-<CODE>bzfree</CODE> and
-<CODE>opaque</CODE> to <CODE>NULL</CODE>,
-and the library will then use the standard <CODE>malloc</CODE>/<CODE>free</CODE>
-routines.
-
-</P>
-<P>
-Before calling <CODE>BZ2_bzCompressInit</CODE>, fields <CODE>bzalloc</CODE>,
-<CODE>bzfree</CODE> and <CODE>opaque</CODE> should
-be filled appropriately, as just described. Upon return, the internal
-state will have been allocated and initialised, and <CODE>total_in_lo32</CODE>,
-<CODE>total_in_hi32</CODE>, <CODE>total_out_lo32</CODE> and
-<CODE>total_out_hi32</CODE> will have been set to zero.
-These four fields are used by the library
-to inform the caller of the total amount of data passed into and out of
-the library, respectively. You should not try to change them.
-As of version 1.0, 64-bit counts are maintained, even on 32-bit
-platforms, using the <CODE>_hi32</CODE> fields to store the upper 32 bits
-of the count. So, for example, the total amount of data in
-is <CODE>(total_in_hi32 << 32) + total_in_lo32</CODE>.
-
-</P>
-<P>
-Parameter <CODE>blockSize100k</CODE> specifies the block size to be used for
-compression. It should be a value between 1 and 9 inclusive, and the
-actual block size used is 100000 x this figure. 9 gives the best
-compression but takes most memory.
-
-</P>
-<P>
-Parameter <CODE>verbosity</CODE> should be set to a number between 0 and 4
-inclusive. 0 is silent, and greater numbers give increasingly verbose
-monitoring/debugging output. If the library has been compiled with
-<CODE>-DBZ_NO_STDIO</CODE>, no such output will appear for any verbosity
-setting.
-
-</P>
-<P>
-Parameter <CODE>workFactor</CODE> controls how the compression phase behaves
-when presented with worst case, highly repetitive, input data. If
-compression runs into difficulties caused by repetitive data, the
-library switches from the standard sorting algorithm to a fallback
-algorithm. The fallback is slower than the standard algorithm by
-perhaps a factor of three, but always behaves reasonably, no matter how
-bad the input.
-
-</P>
-<P>
-Lower values of <CODE>workFactor</CODE> reduce the amount of effort the
-standard algorithm will expend before resorting to the fallback. You
-should set this parameter carefully; too low, and many inputs will be
-handled by the fallback algorithm and so compress rather slowly, too
-high, and your average-to-worst case compression times can become very
-large. The default value of 30 gives reasonable behaviour over a wide
-range of circumstances.
-
-</P>
-<P>
-Allowable values range from 0 to 250 inclusive. 0 is a special case,
-equivalent to using the default value of 30.
-
-</P>
-<P>
-Note that the compressed output generated is the same regardless of
-whether or not the fallback algorithm is used.
-
-</P>
-<P>
-Be aware also that this parameter may disappear entirely in future
-versions of the library. In principle it should be possible to devise a
-good way to automatically choose which algorithm to use. Such a
-mechanism would render the parameter obsolete.
-
-</P>
-<P>
-Possible return values:
-
-<PRE>
- <CODE>BZ_CONFIG_ERROR</CODE>
- if the library has been mis-compiled
- <CODE>BZ_PARAM_ERROR</CODE>
- if <CODE>strm</CODE> is <CODE>NULL</CODE>
- or <CODE>blockSize</CODE> < 1 or <CODE>blockSize</CODE> > 9
- or <CODE>verbosity</CODE> < 0 or <CODE>verbosity</CODE> > 4
- or <CODE>workFactor</CODE> < 0 or <CODE>workFactor</CODE> > 250
- <CODE>BZ_MEM_ERROR</CODE>
- if not enough memory is available
- <CODE>BZ_OK</CODE>
- otherwise
-</PRE>
-
-<P>
-Allowable next actions:
-
-<PRE>
- <CODE>BZ2_bzCompress</CODE>
- if <CODE>BZ_OK</CODE> is returned
- no specific action needed in case of error
-</PRE>
-
-
-
-<H3><A NAME="SEC20" HREF="manual_toc.html#TOC20"><CODE>BZ2_bzCompress</CODE></A></H3>
-
-<PRE>
- int BZ2_bzCompress ( bz_stream *strm, int action );
-</PRE>
-
-<P>
-Provides more input and/or output buffer space for the library. The
-caller maintains input and output buffers, and calls <CODE>BZ2_bzCompress</CODE> to
-transfer data between them.
-
-</P>
-<P>
-Before each call to <CODE>BZ2_bzCompress</CODE>, <CODE>next_in</CODE> should point at
-the data to be compressed, and <CODE>avail_in</CODE> should indicate how many
-bytes the library may read. <CODE>BZ2_bzCompress</CODE> updates <CODE>next_in</CODE>,
-<CODE>avail_in</CODE> and <CODE>total_in</CODE> to reflect the number of bytes it
-has read.
-
-</P>
-<P>
-Similarly, <CODE>next_out</CODE> should point to a buffer in which the
-compressed data is to be placed, with <CODE>avail_out</CODE> indicating how
-much output space is available. <CODE>BZ2_bzCompress</CODE> updates
-<CODE>next_out</CODE>, <CODE>avail_out</CODE> and <CODE>total_out</CODE> to reflect the
-number of bytes output.
-
-</P>
-<P>
-You may provide and remove as little or as much data as you like on each
-call of <CODE>BZ2_bzCompress</CODE>. In the limit, it is acceptable to supply and
-remove data one byte at a time, although this would be terribly
-inefficient. You should always ensure that at least one byte of output
-space is available at each call.
-
-</P>
-<P>
-A second purpose of <CODE>BZ2_bzCompress</CODE> is to request a change of mode of the
-compressed stream.
-
-</P>
-<P>
-Conceptually, a compressed stream can be in one of four states: IDLE,
-RUNNING, FLUSHING and FINISHING. Before initialisation
-(<CODE>BZ2_bzCompressInit</CODE>) and after termination (<CODE>BZ2_bzCompressEnd</CODE>), a
-stream is regarded as IDLE.
-
-</P>
-<P>
-Upon initialisation (<CODE>BZ2_bzCompressInit</CODE>), the stream is placed in the
-RUNNING state. Subsequent calls to <CODE>BZ2_bzCompress</CODE> should pass
-<CODE>BZ_RUN</CODE> as the requested action; other actions are illegal and
-will result in <CODE>BZ_SEQUENCE_ERROR</CODE>.
-
-</P>
-<P>
-At some point, the calling program will have provided all the input data
-it wants to. It will then want to finish up -- in effect, asking the
-library to process any data it might have buffered internally. In this
-state, <CODE>BZ2_bzCompress</CODE> will no longer attempt to read data from
-<CODE>next_in</CODE>, but it will want to write data to <CODE>next_out</CODE>.
-Because the output buffer supplied by the user can be arbitrarily small,
-the finishing-up operation cannot necessarily be done with a single call
-of <CODE>BZ2_bzCompress</CODE>.
-
-</P>
-<P>
-Instead, the calling program passes <CODE>BZ_FINISH</CODE> as an action to
-<CODE>BZ2_bzCompress</CODE>. This changes the stream's state to FINISHING. Any
-remaining input (ie, <CODE>next_in[0 .. avail_in-1]</CODE>) is compressed and
-transferred to the output buffer. To do this, <CODE>BZ2_bzCompress</CODE> must be
-called repeatedly until all the output has been consumed. At that
-point, <CODE>BZ2_bzCompress</CODE> returns <CODE>BZ_STREAM_END</CODE>, and the stream's
-state is set back to IDLE. <CODE>BZ2_bzCompressEnd</CODE> should then be
-called.
-
-</P>
-<P>
-Just to make sure the calling program does not cheat, the library makes
-a note of <CODE>avail_in</CODE> at the time of the first call to
-<CODE>BZ2_bzCompress</CODE> which has <CODE>BZ_FINISH</CODE> as an action (ie, at the
-time the program has announced its intention to not supply any more
-input). By comparing this value with that of <CODE>avail_in</CODE> over
-subsequent calls to <CODE>BZ2_bzCompress</CODE>, the library can detect any
-attempts to slip in more data to compress. Any calls for which this is
-detected will return <CODE>BZ_SEQUENCE_ERROR</CODE>. This indicates a
-programming mistake which should be corrected.
-
-</P>
-<P>
-Instead of asking to finish, the calling program may ask
-<CODE>BZ2_bzCompress</CODE> to take all the remaining input, compress it and
-terminate the current (Burrows-Wheeler) compression block. This could
-be useful for error control purposes. The mechanism is analogous to
-that for finishing: call <CODE>BZ2_bzCompress</CODE> with an action of
-<CODE>BZ_FLUSH</CODE>, remove output data, and persist with the
-<CODE>BZ_FLUSH</CODE> action until the value <CODE>BZ_RUN</CODE> is returned. As
-with finishing, <CODE>BZ2_bzCompress</CODE> detects any attempt to provide more
-input data once the flush has begun.
-
-</P>
-<P>
-Once the flush is complete, the stream returns to the normal RUNNING
-state.
-
-</P>
-<P>
-This all sounds pretty complex, but isn't really. Here's a table
-which shows which actions are allowable in each state, what action
-will be taken, what the next state is, and what the non-error return
-values are. Note that you can't explicitly ask what state the
-stream is in, but nor do you need to -- it can be inferred from the
-values returned by <CODE>BZ2_bzCompress</CODE>.
-
-<PRE>
-IDLE/<CODE>any</CODE>
- Illegal. IDLE state only exists after <CODE>BZ2_bzCompressEnd</CODE> or
- before <CODE>BZ2_bzCompressInit</CODE>.
- Return value = <CODE>BZ_SEQUENCE_ERROR</CODE>
-
-RUNNING/<CODE>BZ_RUN</CODE>
- Compress from <CODE>next_in</CODE> to <CODE>next_out</CODE> as much as possible.
- Next state = RUNNING
- Return value = <CODE>BZ_RUN_OK</CODE>
-
-RUNNING/<CODE>BZ_FLUSH</CODE>
- Remember current value of <CODE>next_in</CODE>. Compress from <CODE>next_in</CODE>
- to <CODE>next_out</CODE> as much as possible, but do not accept any more input.
- Next state = FLUSHING
- Return value = <CODE>BZ_FLUSH_OK</CODE>
-
-RUNNING/<CODE>BZ_FINISH</CODE>
- Remember current value of <CODE>next_in</CODE>. Compress from <CODE>next_in</CODE>
- to <CODE>next_out</CODE> as much as possible, but do not accept any more input.
- Next state = FINISHING
- Return value = <CODE>BZ_FINISH_OK</CODE>
-
-FLUSHING/<CODE>BZ_FLUSH</CODE>
- Compress from <CODE>next_in</CODE> to <CODE>next_out</CODE> as much as possible,
- but do not accept any more input.
- If all the existing input has been used up and all compressed
- output has been removed
- Next state = RUNNING; Return value = <CODE>BZ_RUN_OK</CODE>
- else
- Next state = FLUSHING; Return value = <CODE>BZ_FLUSH_OK</CODE>
-
-FLUSHING/other
- Illegal.
- Return value = <CODE>BZ_SEQUENCE_ERROR</CODE>
-
-FINISHING/<CODE>BZ_FINISH</CODE>
- Compress from <CODE>next_in</CODE> to <CODE>next_out</CODE> as much as possible,
- but to not accept any more input.
- If all the existing input has been used up and all compressed
- output has been removed
- Next state = IDLE; Return value = <CODE>BZ_STREAM_END</CODE>
- else
- Next state = FINISHING; Return value = <CODE>BZ_FINISHING</CODE>
-
-FINISHING/other
- Illegal.
- Return value = <CODE>BZ_SEQUENCE_ERROR</CODE>
-</PRE>
-
-<P>
-That still looks complicated? Well, fair enough. The usual sequence
-of calls for compressing a load of data is:
-
-<UL>
-<LI>Get started with <CODE>BZ2_bzCompressInit</CODE>.
-
-<LI>Shovel data in and shlurp out its compressed form using zero or more
-
-calls of <CODE>BZ2_bzCompress</CODE> with action = <CODE>BZ_RUN</CODE>.
-<LI>Finish up.
-
-Repeatedly call <CODE>BZ2_bzCompress</CODE> with action = <CODE>BZ_FINISH</CODE>,
-copying out the compressed output, until <CODE>BZ_STREAM_END</CODE> is returned.
-<LI>Close up and go home. Call <CODE>BZ2_bzCompressEnd</CODE>.
-
-</UL>
-
-<P>
-If the data you want to compress fits into your input buffer all
-at once, you can skip the calls of <CODE>BZ2_bzCompress ( ..., BZ_RUN )</CODE> and
-just do the <CODE>BZ2_bzCompress ( ..., BZ_FINISH )</CODE> calls.
-
-</P>
-<P>
-All required memory is allocated by <CODE>BZ2_bzCompressInit</CODE>. The
-compression library can accept any data at all (obviously). So you
-shouldn't get any error return values from the <CODE>BZ2_bzCompress</CODE> calls.
-If you do, they will be <CODE>BZ_SEQUENCE_ERROR</CODE>, and indicate a bug in
-your programming.
-
-</P>
-<P>
-Trivial other possible return values:
-
-<PRE>
- <CODE>BZ_PARAM_ERROR</CODE>
- if <CODE>strm</CODE> is <CODE>NULL</CODE>, or <CODE>strm->s</CODE> is <CODE>NULL</CODE>
-</PRE>
-
-
-
-<H3><A NAME="SEC21" HREF="manual_toc.html#TOC21"><CODE>BZ2_bzCompressEnd</CODE></A></H3>
-
-<PRE>
-int BZ2_bzCompressEnd ( bz_stream *strm );
-</PRE>
-
-<P>
-Releases all memory associated with a compression stream.
-
-</P>
-<P>
-Possible return values:
-
-<PRE>
- <CODE>BZ_PARAM_ERROR</CODE> if <CODE>strm</CODE> is <CODE>NULL</CODE> or <CODE>strm->s</CODE> is <CODE>NULL</CODE>
- <CODE>BZ_OK</CODE> otherwise
-</PRE>
-
-
-
-<H3><A NAME="SEC22" HREF="manual_toc.html#TOC22"><CODE>BZ2_bzDecompressInit</CODE></A></H3>
-
-<PRE>
-int BZ2_bzDecompressInit ( bz_stream *strm, int verbosity, int small );
-</PRE>
-
-<P>
-Prepares for decompression. As with <CODE>BZ2_bzCompressInit</CODE>, a
-<CODE>bz_stream</CODE> record should be allocated and initialised before the
-call. Fields <CODE>bzalloc</CODE>, <CODE>bzfree</CODE> and <CODE>opaque</CODE> should be
-set if a custom memory allocator is required, or made <CODE>NULL</CODE> for
-the normal <CODE>malloc</CODE>/<CODE>free</CODE> routines. Upon return, the internal
-state will have been initialised, and <CODE>total_in</CODE> and
-<CODE>total_out</CODE> will be zero.
-
-</P>
-<P>
-For the meaning of parameter <CODE>verbosity</CODE>, see <CODE>BZ2_bzCompressInit</CODE>.
-
-</P>
-<P>
-If <CODE>small</CODE> is nonzero, the library will use an alternative
-decompression algorithm which uses less memory but at the cost of
-decompressing more slowly (roughly speaking, half the speed, but the
-maximum memory requirement drops to around 2300k). See Chapter 2 for
-more information on memory management.
-
-</P>
-<P>
-Note that the amount of memory needed to decompress
-a stream cannot be determined until the stream's header has been read,
-so even if <CODE>BZ2_bzDecompressInit</CODE> succeeds, a subsequent
-<CODE>BZ2_bzDecompress</CODE> could fail with <CODE>BZ_MEM_ERROR</CODE>.
-
-</P>
-<P>
-Possible return values:
-
-<PRE>
- <CODE>BZ_CONFIG_ERROR</CODE>
- if the library has been mis-compiled
- <CODE>BZ_PARAM_ERROR</CODE>
- if <CODE>(small != 0 && small != 1)</CODE>
- or <CODE>(verbosity < 0 || verbosity > 4)</CODE>
- <CODE>BZ_MEM_ERROR</CODE>
- if insufficient memory is available
-</PRE>
-
-<P>
-Allowable next actions:
-
-<PRE>
- <CODE>BZ2_bzDecompress</CODE>
- if <CODE>BZ_OK</CODE> was returned
- no specific action required in case of error
-</PRE>
-
-<P>
-
-
-</P>
-
-
-<H3><A NAME="SEC23" HREF="manual_toc.html#TOC23"><CODE>BZ2_bzDecompress</CODE></A></H3>
-
-<PRE>
-int BZ2_bzDecompress ( bz_stream *strm );
-</PRE>
-
-<P>
-Provides more input and/out output buffer space for the library. The
-caller maintains input and output buffers, and uses <CODE>BZ2_bzDecompress</CODE>
-to transfer data between them.
-
-</P>
-<P>
-Before each call to <CODE>BZ2_bzDecompress</CODE>, <CODE>next_in</CODE>
-should point at the compressed data,
-and <CODE>avail_in</CODE> should indicate how many bytes the library
-may read. <CODE>BZ2_bzDecompress</CODE> updates <CODE>next_in</CODE>, <CODE>avail_in</CODE>
-and <CODE>total_in</CODE>
-to reflect the number of bytes it has read.
-
-</P>
-<P>
-Similarly, <CODE>next_out</CODE> should point to a buffer in which the uncompressed
-output is to be placed, with <CODE>avail_out</CODE> indicating how much output space
-is available. <CODE>BZ2_bzCompress</CODE> updates <CODE>next_out</CODE>,
-<CODE>avail_out</CODE> and <CODE>total_out</CODE> to reflect
-the number of bytes output.
-
-</P>
-<P>
-You may provide and remove as little or as much data as you like on
-each call of <CODE>BZ2_bzDecompress</CODE>.
-In the limit, it is acceptable to
-supply and remove data one byte at a time, although this would be
-terribly inefficient. You should always ensure that at least one
-byte of output space is available at each call.
-
-</P>
-<P>
-Use of <CODE>BZ2_bzDecompress</CODE> is simpler than <CODE>BZ2_bzCompress</CODE>.
-
-</P>
-<P>
-You should provide input and remove output as described above, and
-repeatedly call <CODE>BZ2_bzDecompress</CODE> until <CODE>BZ_STREAM_END</CODE> is
-returned. Appearance of <CODE>BZ_STREAM_END</CODE> denotes that
-<CODE>BZ2_bzDecompress</CODE> has detected the logical end of the compressed
-stream. <CODE>BZ2_bzDecompress</CODE> will not produce <CODE>BZ_STREAM_END</CODE> until
-all output data has been placed into the output buffer, so once
-<CODE>BZ_STREAM_END</CODE> appears, you are guaranteed to have available all
-the decompressed output, and <CODE>BZ2_bzDecompressEnd</CODE> can safely be
-called.
-
-</P>
-<P>
-If case of an error return value, you should call <CODE>BZ2_bzDecompressEnd</CODE>
-to clean up and release memory.
-
-</P>
-<P>
-Possible return values:
-
-<PRE>
- <CODE>BZ_PARAM_ERROR</CODE>
- if <CODE>strm</CODE> is <CODE>NULL</CODE> or <CODE>strm->s</CODE> is <CODE>NULL</CODE>
- or <CODE>strm->avail_out < 1</CODE>
- <CODE>BZ_DATA_ERROR</CODE>
- if a data integrity error is detected in the compressed stream
- <CODE>BZ_DATA_ERROR_MAGIC</CODE>
- if the compressed stream doesn't begin with the right magic bytes
- <CODE>BZ_MEM_ERROR</CODE>
- if there wasn't enough memory available
- <CODE>BZ_STREAM_END</CODE>
- if the logical end of the data stream was detected and all
- output in has been consumed, eg <CODE>s->avail_out > 0</CODE>
- <CODE>BZ_OK</CODE>
- otherwise
-</PRE>
-
-<P>
-Allowable next actions:
-
-<PRE>
- <CODE>BZ2_bzDecompress</CODE>
- if <CODE>BZ_OK</CODE> was returned
- <CODE>BZ2_bzDecompressEnd</CODE>
- otherwise
-</PRE>
-
-
-
-<H3><A NAME="SEC24" HREF="manual_toc.html#TOC24"><CODE>BZ2_bzDecompressEnd</CODE></A></H3>
-
-<PRE>
-int BZ2_bzDecompressEnd ( bz_stream *strm );
-</PRE>
-
-<P>
-Releases all memory associated with a decompression stream.
-
-</P>
-<P>
-Possible return values:
-
-<PRE>
- <CODE>BZ_PARAM_ERROR</CODE>
- if <CODE>strm</CODE> is <CODE>NULL</CODE> or <CODE>strm->s</CODE> is <CODE>NULL</CODE>
- <CODE>BZ_OK</CODE>
- otherwise
-</PRE>
-
-<P>
-Allowable next actions:
-
-<PRE>
- None.
-</PRE>
-
-
-
-<H2><A NAME="SEC25" HREF="manual_toc.html#TOC25">High-level interface</A></H2>
-
-<P>
-This interface provides functions for reading and writing
-<CODE>bzip2</CODE> format files. First, some general points.
-
-</P>
-
-<UL>
-<LI>All of the functions take an <CODE>int*</CODE> first argument,
-
- <CODE>bzerror</CODE>.
- After each call, <CODE>bzerror</CODE> should be consulted first to determine
- the outcome of the call. If <CODE>bzerror</CODE> is <CODE>BZ_OK</CODE>,
- the call completed
- successfully, and only then should the return value of the function
- (if any) be consulted. If <CODE>bzerror</CODE> is <CODE>BZ_IO_ERROR</CODE>,
- there was an error
- reading/writing the underlying compressed file, and you should
- then consult <CODE>errno</CODE>/<CODE>perror</CODE> to determine the
- cause of the difficulty.
- <CODE>bzerror</CODE> may also be set to various other values; precise details are
- given on a per-function basis below.
-<LI>If <CODE>bzerror</CODE> indicates an error
-
- (ie, anything except <CODE>BZ_OK</CODE> and <CODE>BZ_STREAM_END</CODE>),
- you should immediately call <CODE>BZ2_bzReadClose</CODE> (or <CODE>BZ2_bzWriteClose</CODE>,
- depending on whether you are attempting to read or to write)
- to free up all resources associated
- with the stream. Once an error has been indicated, behaviour of all calls
- except <CODE>BZ2_bzReadClose</CODE> (<CODE>BZ2_bzWriteClose</CODE>) is undefined.
- The implication is that (1) <CODE>bzerror</CODE> should
- be checked after each call, and (2) if <CODE>bzerror</CODE> indicates an error,
- <CODE>BZ2_bzReadClose</CODE> (<CODE>BZ2_bzWriteClose</CODE>) should then be called to clean up.
-<LI>The <CODE>FILE*</CODE> arguments passed to
-
- <CODE>BZ2_bzReadOpen</CODE>/<CODE>BZ2_bzWriteOpen</CODE>
- should be set to binary mode.
- Most Unix systems will do this by default, but other platforms,
- including Windows and Mac, will not. If you omit this, you may
- encounter problems when moving code to new platforms.
-<LI>Memory allocation requests are handled by
-
- <CODE>malloc</CODE>/<CODE>free</CODE>.
- At present
- there is no facility for user-defined memory allocators in the file I/O
- functions (could easily be added, though).
-</UL>
-
-
-
-<H3><A NAME="SEC26" HREF="manual_toc.html#TOC26"><CODE>BZ2_bzReadOpen</CODE></A></H3>
-
-<PRE>
- typedef void BZFILE;
-
- BZFILE *BZ2_bzReadOpen ( int *bzerror, FILE *f,
- int small, int verbosity,
- void *unused, int nUnused );
-</PRE>
-
-<P>
-Prepare to read compressed data from file handle <CODE>f</CODE>. <CODE>f</CODE>
-should refer to a file which has been opened for reading, and for which
-the error indicator (<CODE>ferror(f)</CODE>)is not set. If <CODE>small</CODE> is 1,
-the library will try to decompress using less memory, at the expense of
-speed.
-
-</P>
-<P>
-For reasons explained below, <CODE>BZ2_bzRead</CODE> will decompress the
-<CODE>nUnused</CODE> bytes starting at <CODE>unused</CODE>, before starting to read
-from the file <CODE>f</CODE>. At most <CODE>BZ_MAX_UNUSED</CODE> bytes may be
-supplied like this. If this facility is not required, you should pass
-<CODE>NULL</CODE> and <CODE>0</CODE> for <CODE>unused</CODE> and n<CODE>Unused</CODE>
-respectively.
-
-</P>
-<P>
-For the meaning of parameters <CODE>small</CODE> and <CODE>verbosity</CODE>,
-see <CODE>BZ2_bzDecompressInit</CODE>.
-
-</P>
-<P>
-The amount of memory needed to decompress a file cannot be determined
-until the file's header has been read. So it is possible that
-<CODE>BZ2_bzReadOpen</CODE> returns <CODE>BZ_OK</CODE> but a subsequent call of
-<CODE>BZ2_bzRead</CODE> will return <CODE>BZ_MEM_ERROR</CODE>.
-
-</P>
-<P>
-Possible assignments to <CODE>bzerror</CODE>:
-
-<PRE>
- <CODE>BZ_CONFIG_ERROR</CODE>
- if the library has been mis-compiled
- <CODE>BZ_PARAM_ERROR</CODE>
- if <CODE>f</CODE> is <CODE>NULL</CODE>
- or <CODE>small</CODE> is neither <CODE>0</CODE> nor <CODE>1</CODE>
- or <CODE>(unused == NULL && nUnused != 0)</CODE>
- or <CODE>(unused != NULL && !(0 <= nUnused <= BZ_MAX_UNUSED))</CODE>
- <CODE>BZ_IO_ERROR</CODE>
- if <CODE>ferror(f)</CODE> is nonzero
- <CODE>BZ_MEM_ERROR</CODE>
- if insufficient memory is available
- <CODE>BZ_OK</CODE>
- otherwise.
-</PRE>
-
-<P>
-Possible return values:
-
-<PRE>
- Pointer to an abstract <CODE>BZFILE</CODE>
- if <CODE>bzerror</CODE> is <CODE>BZ_OK</CODE>
- <CODE>NULL</CODE>
- otherwise
-</PRE>
-
-<P>
-Allowable next actions:
-
-<PRE>
- <CODE>BZ2_bzRead</CODE>
- if <CODE>bzerror</CODE> is <CODE>BZ_OK</CODE>
- <CODE>BZ2_bzClose</CODE>
- otherwise
-</PRE>
-
-
-
-<H3><A NAME="SEC27" HREF="manual_toc.html#TOC27"><CODE>BZ2_bzRead</CODE></A></H3>
-
-<PRE>
- int BZ2_bzRead ( int *bzerror, BZFILE *b, void *buf, int len );
-</PRE>
-
-<P>
-Reads up to <CODE>len</CODE> (uncompressed) bytes from the compressed file
-<CODE>b</CODE> into
-the buffer <CODE>buf</CODE>. If the read was successful,
-<CODE>bzerror</CODE> is set to <CODE>BZ_OK</CODE>
-and the number of bytes read is returned. If the logical end-of-stream
-was detected, <CODE>bzerror</CODE> will be set to <CODE>BZ_STREAM_END</CODE>,
-and the number
-of bytes read is returned. All other <CODE>bzerror</CODE> values denote an error.
-
-</P>
-<P>
-<CODE>BZ2_bzRead</CODE> will supply <CODE>len</CODE> bytes,
-unless the logical stream end is detected
-or an error occurs. Because of this, it is possible to detect the
-stream end by observing when the number of bytes returned is
-less than the number
-requested. Nevertheless, this is regarded as inadvisable; you should
-instead check <CODE>bzerror</CODE> after every call and watch out for
-<CODE>BZ_STREAM_END</CODE>.
-
-</P>
-<P>
-Internally, <CODE>BZ2_bzRead</CODE> copies data from the compressed file in chunks
-of size <CODE>BZ_MAX_UNUSED</CODE> bytes
-before decompressing it. If the file contains more bytes than strictly
-needed to reach the logical end-of-stream, <CODE>BZ2_bzRead</CODE> will almost certainly
-read some of the trailing data before signalling <CODE>BZ_SEQUENCE_END</CODE>.
-To collect the read but unused data once <CODE>BZ_SEQUENCE_END</CODE> has
-appeared, call <CODE>BZ2_bzReadGetUnused</CODE> immediately before <CODE>BZ2_bzReadClose</CODE>.
-
-</P>
-<P>
-Possible assignments to <CODE>bzerror</CODE>:
-
-<PRE>
- <CODE>BZ_PARAM_ERROR</CODE>
- if <CODE>b</CODE> is <CODE>NULL</CODE> or <CODE>buf</CODE> is <CODE>NULL</CODE> or <CODE>len < 0</CODE>
- <CODE>BZ_SEQUENCE_ERROR</CODE>
- if <CODE>b</CODE> was opened with <CODE>BZ2_bzWriteOpen</CODE>
- <CODE>BZ_IO_ERROR</CODE>
- if there is an error reading from the compressed file
- <CODE>BZ_UNEXPECTED_EOF</CODE>
- if the compressed file ended before the logical end-of-stream was detected
- <CODE>BZ_DATA_ERROR</CODE>
- if a data integrity error was detected in the compressed stream
- <CODE>BZ_DATA_ERROR_MAGIC</CODE>
- if the stream does not begin with the requisite header bytes (ie, is not
- a <CODE>bzip2</CODE> data file). This is really a special case of <CODE>BZ_DATA_ERROR</CODE>.
- <CODE>BZ_MEM_ERROR</CODE>
- if insufficient memory was available
- <CODE>BZ_STREAM_END</CODE>
- if the logical end of stream was detected.
- <CODE>BZ_OK</CODE>
- otherwise.
-</PRE>
-
-<P>
-Possible return values:
-
-<PRE>
- number of bytes read
- if <CODE>bzerror</CODE> is <CODE>BZ_OK</CODE> or <CODE>BZ_STREAM_END</CODE>
- undefined
- otherwise
-</PRE>
-
-<P>
-Allowable next actions:
-
-<PRE>
- collect data from <CODE>buf</CODE>, then <CODE>BZ2_bzRead</CODE> or <CODE>BZ2_bzReadClose</CODE>
- if <CODE>bzerror</CODE> is <CODE>BZ_OK</CODE>
- collect data from <CODE>buf</CODE>, then <CODE>BZ2_bzReadClose</CODE> or <CODE>BZ2_bzReadGetUnused</CODE>
- if <CODE>bzerror</CODE> is <CODE>BZ_SEQUENCE_END</CODE>
- <CODE>BZ2_bzReadClose</CODE>
- otherwise
-</PRE>
-
-
-
-<H3><A NAME="SEC28" HREF="manual_toc.html#TOC28"><CODE>BZ2_bzReadGetUnused</CODE></A></H3>
-
-<PRE>
- void BZ2_bzReadGetUnused ( int* bzerror, BZFILE *b,
- void** unused, int* nUnused );
-</PRE>
-
-<P>
-Returns data which was read from the compressed file but was not needed
-to get to the logical end-of-stream. <CODE>*unused</CODE> is set to the address
-of the data, and <CODE>*nUnused</CODE> to the number of bytes. <CODE>*nUnused</CODE> will
-be set to a value between <CODE>0</CODE> and <CODE>BZ_MAX_UNUSED</CODE> inclusive.
-
-</P>
-<P>
-This function may only be called once <CODE>BZ2_bzRead</CODE> has signalled
-<CODE>BZ_STREAM_END</CODE> but before <CODE>BZ2_bzReadClose</CODE>.
-
-</P>
-<P>
-Possible assignments to <CODE>bzerror</CODE>:
-
-<PRE>
- <CODE>BZ_PARAM_ERROR</CODE>
- if <CODE>b</CODE> is <CODE>NULL</CODE>
- or <CODE>unused</CODE> is <CODE>NULL</CODE> or <CODE>nUnused</CODE> is <CODE>NULL</CODE>
- <CODE>BZ_SEQUENCE_ERROR</CODE>
- if <CODE>BZ_STREAM_END</CODE> has not been signalled
- or if <CODE>b</CODE> was opened with <CODE>BZ2_bzWriteOpen</CODE>
- <CODE>BZ_OK</CODE>
- otherwise
-</PRE>
-
-<P>
-Allowable next actions:
-
-<PRE>
- <CODE>BZ2_bzReadClose</CODE>
-</PRE>
-
-
-
-<H3><A NAME="SEC29" HREF="manual_toc.html#TOC29"><CODE>BZ2_bzReadClose</CODE></A></H3>
-
-<PRE>
- void BZ2_bzReadClose ( int *bzerror, BZFILE *b );
-</PRE>
-
-<P>
-Releases all memory pertaining to the compressed file <CODE>b</CODE>.
-<CODE>BZ2_bzReadClose</CODE> does not call <CODE>fclose</CODE> on the underlying file
-handle, so you should do that yourself if appropriate.
-<CODE>BZ2_bzReadClose</CODE> should be called to clean up after all error
-situations.
-
-</P>
-<P>
-Possible assignments to <CODE>bzerror</CODE>:
-
-<PRE>
- <CODE>BZ_SEQUENCE_ERROR</CODE>
- if <CODE>b</CODE> was opened with <CODE>BZ2_bzOpenWrite</CODE>
- <CODE>BZ_OK</CODE>
- otherwise
-</PRE>
-
-<P>
-Allowable next actions:
-
-<PRE>
- none
-</PRE>
-
-
-
-<H3><A NAME="SEC30" HREF="manual_toc.html#TOC30"><CODE>BZ2_bzWriteOpen</CODE></A></H3>
-
-<PRE>
- BZFILE *BZ2_bzWriteOpen ( int *bzerror, FILE *f,
- int blockSize100k, int verbosity,
- int workFactor );
-</PRE>
-
-<P>
-Prepare to write compressed data to file handle <CODE>f</CODE>.
-<CODE>f</CODE> should refer to
-a file which has been opened for writing, and for which the error
-indicator (<CODE>ferror(f)</CODE>)is not set.
-
-</P>
-<P>
-For the meaning of parameters <CODE>blockSize100k</CODE>,
-<CODE>verbosity</CODE> and <CODE>workFactor</CODE>, see
-<BR> <CODE>BZ2_bzCompressInit</CODE>.
-
-</P>
-<P>
-All required memory is allocated at this stage, so if the call
-completes successfully, <CODE>BZ_MEM_ERROR</CODE> cannot be signalled by a
-subsequent call to <CODE>BZ2_bzWrite</CODE>.
-
-</P>
-<P>
-Possible assignments to <CODE>bzerror</CODE>:
-
-<PRE>
- <CODE>BZ_CONFIG_ERROR</CODE>
- if the library has been mis-compiled
- <CODE>BZ_PARAM_ERROR</CODE>
- if <CODE>f</CODE> is <CODE>NULL</CODE>
- or <CODE>blockSize100k < 1</CODE> or <CODE>blockSize100k > 9</CODE>
- <CODE>BZ_IO_ERROR</CODE>
- if <CODE>ferror(f)</CODE> is nonzero
- <CODE>BZ_MEM_ERROR</CODE>
- if insufficient memory is available
- <CODE>BZ_OK</CODE>
- otherwise
-</PRE>
-
-<P>
-Possible return values:
-
-<PRE>
- Pointer to an abstract <CODE>BZFILE</CODE>
- if <CODE>bzerror</CODE> is <CODE>BZ_OK</CODE>
- <CODE>NULL</CODE>
- otherwise
-</PRE>
-
-<P>
-Allowable next actions:
-
-<PRE>
- <CODE>BZ2_bzWrite</CODE>
- if <CODE>bzerror</CODE> is <CODE>BZ_OK</CODE>
- (you could go directly to <CODE>BZ2_bzWriteClose</CODE>, but this would be pretty pointless)
- <CODE>BZ2_bzWriteClose</CODE>
- otherwise
-</PRE>
-
-
-
-<H3><A NAME="SEC31" HREF="manual_toc.html#TOC31"><CODE>BZ2_bzWrite</CODE></A></H3>
-
-<PRE>
- void BZ2_bzWrite ( int *bzerror, BZFILE *b, void *buf, int len );
-</PRE>
-
-<P>
-Absorbs <CODE>len</CODE> bytes from the buffer <CODE>buf</CODE>, eventually to be
-compressed and written to the file.
-
-</P>
-<P>
-Possible assignments to <CODE>bzerror</CODE>:
-
-<PRE>
- <CODE>BZ_PARAM_ERROR</CODE>
- if <CODE>b</CODE> is <CODE>NULL</CODE> or <CODE>buf</CODE> is <CODE>NULL</CODE> or <CODE>len < 0</CODE>
- <CODE>BZ_SEQUENCE_ERROR</CODE>
- if b was opened with <CODE>BZ2_bzReadOpen</CODE>
- <CODE>BZ_IO_ERROR</CODE>
- if there is an error writing the compressed file.
- <CODE>BZ_OK</CODE>
- otherwise
-</PRE>
-
-
-
-<H3><A NAME="SEC32" HREF="manual_toc.html#TOC32"><CODE>BZ2_bzWriteClose</CODE></A></H3>
-
-<PRE>
- void BZ2_bzWriteClose ( int *bzerror, BZFILE* f,
- int abandon,
- unsigned int* nbytes_in,
- unsigned int* nbytes_out );
-
- void BZ2_bzWriteClose64 ( int *bzerror, BZFILE* f,
- int abandon,
- unsigned int* nbytes_in_lo32,
- unsigned int* nbytes_in_hi32,
- unsigned int* nbytes_out_lo32,
- unsigned int* nbytes_out_hi32 );
-</PRE>
-
-<P>
-Compresses and flushes to the compressed file all data so far supplied
-by <CODE>BZ2_bzWrite</CODE>. The logical end-of-stream markers are also written, so
-subsequent calls to <CODE>BZ2_bzWrite</CODE> are illegal. All memory associated
-with the compressed file <CODE>b</CODE> is released.
-<CODE>fflush</CODE> is called on the
-compressed file, but it is not <CODE>fclose</CODE>'d.
-
-</P>
-<P>
-If <CODE>BZ2_bzWriteClose</CODE> is called to clean up after an error, the only
-action is to release the memory. The library records the error codes
-issued by previous calls, so this situation will be detected
-automatically. There is no attempt to complete the compression
-operation, nor to <CODE>fflush</CODE> the compressed file. You can force this
-behaviour to happen even in the case of no error, by passing a nonzero
-value to <CODE>abandon</CODE>.
-
-</P>
-<P>
-If <CODE>nbytes_in</CODE> is non-null, <CODE>*nbytes_in</CODE> will be set to be the
-total volume of uncompressed data handled. Similarly, <CODE>nbytes_out</CODE>
-will be set to the total volume of compressed data written. For
-compatibility with older versions of the library, <CODE>BZ2_bzWriteClose</CODE>
-only yields the lower 32 bits of these counts. Use
-<CODE>BZ2_bzWriteClose64</CODE> if you want the full 64 bit counts. These
-two functions are otherwise absolutely identical.
-
-</P>
-
-<P>
-Possible assignments to <CODE>bzerror</CODE>:
-
-<PRE>
- <CODE>BZ_SEQUENCE_ERROR</CODE>
- if <CODE>b</CODE> was opened with <CODE>BZ2_bzReadOpen</CODE>
- <CODE>BZ_IO_ERROR</CODE>
- if there is an error writing the compressed file
- <CODE>BZ_OK</CODE>
- otherwise
-</PRE>
-
-
-
-<H3><A NAME="SEC33" HREF="manual_toc.html#TOC33">Handling embedded compressed data streams</A></H3>
-
-<P>
-The high-level library facilitates use of
-<CODE>bzip2</CODE> data streams which form some part of a surrounding, larger
-data stream.
-
-<UL>
-<LI>For writing, the library takes an open file handle, writes
-
-compressed data to it, <CODE>fflush</CODE>es it but does not <CODE>fclose</CODE> it.
-The calling application can write its own data before and after the
-compressed data stream, using that same file handle.
-<LI>Reading is more complex, and the facilities are not as general
-
-as they could be since generality is hard to reconcile with efficiency.
-<CODE>BZ2_bzRead</CODE> reads from the compressed file in blocks of size
-<CODE>BZ_MAX_UNUSED</CODE> bytes, and in doing so probably will overshoot
-the logical end of compressed stream.
-To recover this data once decompression has
-ended, call <CODE>BZ2_bzReadGetUnused</CODE> after the last call of <CODE>BZ2_bzRead</CODE>
-(the one returning <CODE>BZ_STREAM_END</CODE>) but before calling
-<CODE>BZ2_bzReadClose</CODE>.
-</UL>
-
-<P>
-This mechanism makes it easy to decompress multiple <CODE>bzip2</CODE>
-streams placed end-to-end. As the end of one stream, when <CODE>BZ2_bzRead</CODE>
-returns <CODE>BZ_STREAM_END</CODE>, call <CODE>BZ2_bzReadGetUnused</CODE> to collect the
-unused data (copy it into your own buffer somewhere).
-That data forms the start of the next compressed stream.
-To start uncompressing that next stream, call <CODE>BZ2_bzReadOpen</CODE> again,
-feeding in the unused data via the <CODE>unused</CODE>/<CODE>nUnused</CODE>
-parameters.
-Keep doing this until <CODE>BZ_STREAM_END</CODE> return coincides with the
-physical end of file (<CODE>feof(f)</CODE>). In this situation
-<CODE>BZ2_bzReadGetUnused</CODE>
-will of course return no data.
-
-</P>
-<P>
-This should give some feel for how the high-level interface can be used.
-If you require extra flexibility, you'll have to bite the bullet and get
-to grips with the low-level interface.
-
-</P>
-
-
-<H3><A NAME="SEC34" HREF="manual_toc.html#TOC34">Standard file-reading/writing code</A></H3>
-<P>
-Here's how you'd write data to a compressed file:
-
-<PRE>
-FILE* f;
-BZFILE* b;
-int nBuf;
-char buf[ /* whatever size you like */ ];
-int bzerror;
-int nWritten;
-
-f = fopen ( "myfile.bz2", "w" );
-if (!f) {
- /* handle error */
-}
-b = BZ2_bzWriteOpen ( &bzerror, f, 9 );
-if (bzerror != BZ_OK) {
- BZ2_bzWriteClose ( b );
- /* handle error */
-}
-
-while ( /* condition */ ) {
- /* get data to write into buf, and set nBuf appropriately */
- nWritten = BZ2_bzWrite ( &bzerror, b, buf, nBuf );
- if (bzerror == BZ_IO_ERROR) {
- BZ2_bzWriteClose ( &bzerror, b );
- /* handle error */
- }
-}
-
-BZ2_bzWriteClose ( &bzerror, b );
-if (bzerror == BZ_IO_ERROR) {
- /* handle error */
-}
-</PRE>
-
-<P>
-And to read from a compressed file:
-
-<PRE>
-FILE* f;
-BZFILE* b;
-int nBuf;
-char buf[ /* whatever size you like */ ];
-int bzerror;
-int nWritten;
-
-f = fopen ( "myfile.bz2", "r" );
-if (!f) {
- /* handle error */
-}
-b = BZ2_bzReadOpen ( &bzerror, f, 0, NULL, 0 );
-if (bzerror != BZ_OK) {
- BZ2_bzReadClose ( &bzerror, b );
- /* handle error */
-}
-
-bzerror = BZ_OK;
-while (bzerror == BZ_OK && /* arbitrary other conditions */) {
- nBuf = BZ2_bzRead ( &bzerror, b, buf, /* size of buf */ );
- if (bzerror == BZ_OK) {
- /* do something with buf[0 .. nBuf-1] */
- }
-}
-if (bzerror != BZ_STREAM_END) {
- BZ2_bzReadClose ( &bzerror, b );
- /* handle error */
-} else {
- BZ2_bzReadClose ( &bzerror );
-}
-</PRE>
-
-
-
-<H2><A NAME="SEC35" HREF="manual_toc.html#TOC35">Utility functions</A></H2>
-
-
-<H3><A NAME="SEC36" HREF="manual_toc.html#TOC36"><CODE>BZ2_bzBuffToBuffCompress</CODE></A></H3>
-
-<PRE>
- int BZ2_bzBuffToBuffCompress( char* dest,
- unsigned int* destLen,
- char* source,
- unsigned int sourceLen,
- int blockSize100k,
- int verbosity,
- int workFactor );
-</PRE>
-
-<P>
-Attempts to compress the data in <CODE>source[0 .. sourceLen-1]</CODE>
-into the destination buffer, <CODE>dest[0 .. *destLen-1]</CODE>.
-If the destination buffer is big enough, <CODE>*destLen</CODE> is
-set to the size of the compressed data, and <CODE>BZ_OK</CODE> is
-returned. If the compressed data won't fit, <CODE>*destLen</CODE>
-is unchanged, and <CODE>BZ_OUTBUFF_FULL</CODE> is returned.
-
-</P>
-<P>
-Compression in this manner is a one-shot event, done with a single call
-to this function. The resulting compressed data is a complete
-<CODE>bzip2</CODE> format data stream. There is no mechanism for making
-additional calls to provide extra input data. If you want that kind of
-mechanism, use the low-level interface.
-
-</P>
-<P>
-For the meaning of parameters <CODE>blockSize100k</CODE>, <CODE>verbosity</CODE>
-and <CODE>workFactor</CODE>, <BR> see <CODE>BZ2_bzCompressInit</CODE>.
-
-</P>
-<P>
-To guarantee that the compressed data will fit in its buffer, allocate
-an output buffer of size 1% larger than the uncompressed data, plus
-six hundred extra bytes.
-
-</P>
-<P>
-<CODE>BZ2_bzBuffToBuffDecompress</CODE> will not write data at or
-beyond <CODE>dest[*destLen]</CODE>, even in case of buffer overflow.
-
-</P>
-<P>
-Possible return values:
-
-<PRE>
- <CODE>BZ_CONFIG_ERROR</CODE>
- if the library has been mis-compiled
- <CODE>BZ_PARAM_ERROR</CODE>
- if <CODE>dest</CODE> is <CODE>NULL</CODE> or <CODE>destLen</CODE> is <CODE>NULL</CODE>
- or <CODE>blockSize100k < 1</CODE> or <CODE>blockSize100k > 9</CODE>
- or <CODE>verbosity < 0</CODE> or <CODE>verbosity > 4</CODE>
- or <CODE>workFactor < 0</CODE> or <CODE>workFactor > 250</CODE>
- <CODE>BZ_MEM_ERROR</CODE>
- if insufficient memory is available
- <CODE>BZ_OUTBUFF_FULL</CODE>
- if the size of the compressed data exceeds <CODE>*destLen</CODE>
- <CODE>BZ_OK</CODE>
- otherwise
-</PRE>
-
-
-
-<H3><A NAME="SEC37" HREF="manual_toc.html#TOC37"><CODE>BZ2_bzBuffToBuffDecompress</CODE></A></H3>
-
-<PRE>
- int BZ2_bzBuffToBuffDecompress ( char* dest,
- unsigned int* destLen,
- char* source,
- unsigned int sourceLen,
- int small,
- int verbosity );
-</PRE>
-
-<P>
-Attempts to decompress the data in <CODE>source[0 .. sourceLen-1]</CODE>
-into the destination buffer, <CODE>dest[0 .. *destLen-1]</CODE>.
-If the destination buffer is big enough, <CODE>*destLen</CODE> is
-set to the size of the uncompressed data, and <CODE>BZ_OK</CODE> is
-returned. If the compressed data won't fit, <CODE>*destLen</CODE>
-is unchanged, and <CODE>BZ_OUTBUFF_FULL</CODE> is returned.
-
-</P>
-<P>
-<CODE>source</CODE> is assumed to hold a complete <CODE>bzip2</CODE> format
-data stream. <BR> <CODE>BZ2_bzBuffToBuffDecompress</CODE> tries to decompress
-the entirety of the stream into the output buffer.
-
-</P>
-<P>
-For the meaning of parameters <CODE>small</CODE> and <CODE>verbosity</CODE>,
-see <CODE>BZ2_bzDecompressInit</CODE>.
-
-</P>
-<P>
-Because the compression ratio of the compressed data cannot be known in
-advance, there is no easy way to guarantee that the output buffer will
-be big enough. You may of course make arrangements in your code to
-record the size of the uncompressed data, but such a mechanism is beyond
-the scope of this library.
-
-</P>
-<P>
-<CODE>BZ2_bzBuffToBuffDecompress</CODE> will not write data at or
-beyond <CODE>dest[*destLen]</CODE>, even in case of buffer overflow.
-
-</P>
-<P>
-Possible return values:
-
-<PRE>
- <CODE>BZ_CONFIG_ERROR</CODE>
- if the library has been mis-compiled
- <CODE>BZ_PARAM_ERROR</CODE>
- if <CODE>dest</CODE> is <CODE>NULL</CODE> or <CODE>destLen</CODE> is <CODE>NULL</CODE>
- or <CODE>small != 0 && small != 1</CODE>
- or <CODE>verbosity < 0</CODE> or <CODE>verbosity > 4</CODE>
- <CODE>BZ_MEM_ERROR</CODE>
- if insufficient memory is available
- <CODE>BZ_OUTBUFF_FULL</CODE>
- if the size of the compressed data exceeds <CODE>*destLen</CODE>
- <CODE>BZ_DATA_ERROR</CODE>
- if a data integrity error was detected in the compressed data
- <CODE>BZ_DATA_ERROR_MAGIC</CODE>
- if the compressed data doesn't begin with the right magic bytes
- <CODE>BZ_UNEXPECTED_EOF</CODE>
- if the compressed data ends unexpectedly
- <CODE>BZ_OK</CODE>
- otherwise
-</PRE>
-
-
-
-<H2><A NAME="SEC38" HREF="manual_toc.html#TOC38"><CODE>zlib</CODE> compatibility functions</A></H2>
-<P>
-Yoshioka Tsuneo has contributed some functions to
-give better <CODE>zlib</CODE> compatibility. These functions are
-<CODE>BZ2_bzopen</CODE>, <CODE>BZ2_bzread</CODE>, <CODE>BZ2_bzwrite</CODE>, <CODE>BZ2_bzflush</CODE>,
-<CODE>BZ2_bzclose</CODE>,
-<CODE>BZ2_bzerror</CODE> and <CODE>BZ2_bzlibVersion</CODE>.
-These functions are not (yet) officially part of
-the library. If they break, you get to keep all the pieces.
-Nevertheless, I think they work ok.
-
-<PRE>
-typedef void BZFILE;
-
-const char * BZ2_bzlibVersion ( void );
-</PRE>
-
-<P>
-Returns a string indicating the library version.
-
-<PRE>
-BZFILE * BZ2_bzopen ( const char *path, const char *mode );
-BZFILE * BZ2_bzdopen ( int fd, const char *mode );
-</PRE>
-
-<P>
-Opens a <CODE>.bz2</CODE> file for reading or writing, using either its name
-or a pre-existing file descriptor.
-Analogous to <CODE>fopen</CODE> and <CODE>fdopen</CODE>.
-
-<PRE>
-int BZ2_bzread ( BZFILE* b, void* buf, int len );
-int BZ2_bzwrite ( BZFILE* b, void* buf, int len );
-</PRE>
-
-<P>
-Reads/writes data from/to a previously opened <CODE>BZFILE</CODE>.
-Analogous to <CODE>fread</CODE> and <CODE>fwrite</CODE>.
-
-<PRE>
-int BZ2_bzflush ( BZFILE* b );
-void BZ2_bzclose ( BZFILE* b );
-</PRE>
-
-<P>
-Flushes/closes a <CODE>BZFILE</CODE>. <CODE>BZ2_bzflush</CODE> doesn't actually do
-anything. Analogous to <CODE>fflush</CODE> and <CODE>fclose</CODE>.
-
-</P>
-
-<PRE>
-const char * BZ2_bzerror ( BZFILE *b, int *errnum )
-</PRE>
-
-<P>
-Returns a string describing the more recent error status of
-<CODE>b</CODE>, and also sets <CODE>*errnum</CODE> to its numerical value.
-
-</P>
-
-
-
-<H2><A NAME="SEC39" HREF="manual_toc.html#TOC39">Using the library in a <CODE>stdio</CODE>-free environment</A></H2>
-
-
-
-<H3><A NAME="SEC40" HREF="manual_toc.html#TOC40">Getting rid of <CODE>stdio</CODE></A></H3>
-
-<P>
-In a deeply embedded application, you might want to use just
-the memory-to-memory functions. You can do this conveniently
-by compiling the library with preprocessor symbol <CODE>BZ_NO_STDIO</CODE>
-defined. Doing this gives you a library containing only the following
-eight functions:
-
-</P>
-<P>
-<CODE>BZ2_bzCompressInit</CODE>, <CODE>BZ2_bzCompress</CODE>, <CODE>BZ2_bzCompressEnd</CODE> <BR>
-<CODE>BZ2_bzDecompressInit</CODE>, <CODE>BZ2_bzDecompress</CODE>, <CODE>BZ2_bzDecompressEnd</CODE> <BR>
-<CODE>BZ2_bzBuffToBuffCompress</CODE>, <CODE>BZ2_bzBuffToBuffDecompress</CODE>
-
-</P>
-<P>
-When compiled like this, all functions will ignore <CODE>verbosity</CODE>
-settings.
-
-</P>
-
-
-<H3><A NAME="SEC41" HREF="manual_toc.html#TOC41">Critical error handling</A></H3>
-<P>
-<CODE>libbzip2</CODE> contains a number of internal assertion checks which
-should, needless to say, never be activated. Nevertheless, if an
-assertion should fail, behaviour depends on whether or not the library
-was compiled with <CODE>BZ_NO_STDIO</CODE> set.
-
-</P>
-<P>
-For a normal compile, an assertion failure yields the message
-
-<PRE>
- bzip2/libbzip2: internal error number N.
- This is a bug in bzip2/libbzip2, 1.0 of 21-Mar-2000.
- Please report it to me at: jseward@acm.org. If this happened
- when you were using some program which uses libbzip2 as a
- component, you should also report this bug to the author(s)
- of that program. Please make an effort to report this bug;
- timely and accurate bug reports eventually lead to higher
- quality software. Thanks. Julian Seward, 21 March 2000.
-</PRE>
-
-<P>
-where <CODE>N</CODE> is some error code number. <CODE>exit(3)</CODE>
-is then called.
-
-</P>
-<P>
-For a <CODE>stdio</CODE>-free library, assertion failures result
-in a call to a function declared as:
-
-<PRE>
- extern void bz_internal_error ( int errcode );
-</PRE>
-
-<P>
-The relevant code is passed as a parameter. You should supply
-such a function.
-
-</P>
-<P>
-In either case, once an assertion failure has occurred, any
-<CODE>bz_stream</CODE> records involved can be regarded as invalid.
-You should not attempt to resume normal operation with them.
-
-</P>
-<P>
-You may, of course, change critical error handling to suit
-your needs. As I said above, critical errors indicate bugs
-in the library and should not occur. All "normal" error
-situations are indicated via error return codes from functions,
-and can be recovered from.
-
-</P>
-
-
-
-<H2><A NAME="SEC42" HREF="manual_toc.html#TOC42">Making a Windows DLL</A></H2>
-<P>
-Everything related to Windows has been contributed by Yoshioka Tsuneo
-<BR> (<CODE>QWF00133@niftyserve.or.jp</CODE> /
-<CODE>tsuneo-y@is.aist-nara.ac.jp</CODE>), so you should send your queries to
-him (but perhaps Cc: me, <CODE>jseward@acm.org</CODE>).
-
-</P>
-<P>
-My vague understanding of what to do is: using Visual C++ 5.0,
-open the project file <CODE>libbz2.dsp</CODE>, and build. That's all.
-
-</P>
-<P>
-If you can't
-open the project file for some reason, make a new one, naming these files:
-<CODE>blocksort.c</CODE>, <CODE>bzlib.c</CODE>, <CODE>compress.c</CODE>,
-<CODE>crctable.c</CODE>, <CODE>decompress.c</CODE>, <CODE>huffman.c</CODE>, <BR>
-<CODE>randtable.c</CODE> and <CODE>libbz2.def</CODE>. You will also need
-to name the header files <CODE>bzlib.h</CODE> and <CODE>bzlib_private.h</CODE>.
-
-</P>
-<P>
-If you don't use VC++, you may need to define the proprocessor symbol
-<CODE>_WIN32</CODE>.
-
-</P>
-<P>
-Finally, <CODE>dlltest.c</CODE> is a sample program using the DLL. It has a
-project file, <CODE>dlltest.dsp</CODE>.
-
-</P>
-<P>
-If you just want a makefile for Visual C, have a look at
-<CODE>makefile.msc</CODE>.
-
-</P>
-<P>
-Be aware that if you compile <CODE>bzip2</CODE> itself on Win32, you must set
-<CODE>BZ_UNIX</CODE> to 0 and <CODE>BZ_LCCWIN32</CODE> to 1, in the file
-<CODE>bzip2.c</CODE>, before compiling. Otherwise the resulting binary won't
-work correctly.
-
-</P>
-<P>
-I haven't tried any of this stuff myself, but it all looks plausible.
-
-</P>
-
-<P><HR><P>
-<p>Go to the <A HREF="manual_1.html">first</A>, <A HREF="manual_2.html">previous</A>, <A HREF="manual_4.html">next</A>, <A HREF="manual_4.html">last</A> section, <A HREF="manual_toc.html">table of contents</A>.
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-<TITLE>bzip2 and libbzip2 - Miscellanea</TITLE>
-<link href="manual_3.html" rel=Previous>
-<link href="manual_toc.html" rel=ToC>
-
-</HEAD>
-<BODY>
-<p>Go to the <A HREF="manual_1.html">first</A>, <A HREF="manual_3.html">previous</A>, next, last section, <A HREF="manual_toc.html">table of contents</A>.
-<P><HR><P>
-
-
-<H1><A NAME="SEC43" HREF="manual_toc.html#TOC43">Miscellanea</A></H1>
-
-<P>
-These are just some random thoughts of mine. Your mileage may
-vary.
-
-</P>
-
-
-<H2><A NAME="SEC44" HREF="manual_toc.html#TOC44">Limitations of the compressed file format</A></H2>
-<P>
-<CODE>bzip2-1.0</CODE>, <CODE>0.9.5</CODE> and <CODE>0.9.0</CODE>
-use exactly the same file format as the previous
-version, <CODE>bzip2-0.1</CODE>. This decision was made in the interests of
-stability. Creating yet another incompatible compressed file format
-would create further confusion and disruption for users.
-
-</P>
-<P>
-Nevertheless, this is not a painless decision. Development
-work since the release of <CODE>bzip2-0.1</CODE> in August 1997
-has shown complexities in the file format which slow down
-decompression and, in retrospect, are unnecessary. These are:
-
-<UL>
-<LI>The run-length encoder, which is the first of the
-
- compression transformations, is entirely irrelevant.
- The original purpose was to protect the sorting algorithm
- from the very worst case input: a string of repeated
- symbols. But algorithm steps Q6a and Q6b in the original
- Burrows-Wheeler technical report (SRC-124) show how
- repeats can be handled without difficulty in block
- sorting.
-<LI>The randomisation mechanism doesn't really need to be
-
- there. Udi Manber and Gene Myers published a suffix
- array construction algorithm a few years back, which
- can be employed to sort any block, no matter how
- repetitive, in O(N log N) time. Subsequent work by
- Kunihiko Sadakane has produced a derivative O(N (log N)^2)
- algorithm which usually outperforms the Manber-Myers
- algorithm.
-
- I could have changed to Sadakane's algorithm, but I find
- it to be slower than <CODE>bzip2</CODE>'s existing algorithm for
- most inputs, and the randomisation mechanism protects
- adequately against bad cases. I didn't think it was
- a good tradeoff to make. Partly this is due to the fact
- that I was not flooded with email complaints about
- <CODE>bzip2-0.1</CODE>'s performance on repetitive data, so
- perhaps it isn't a problem for real inputs.
-
- Probably the best long-term solution,
- and the one I have incorporated into 0.9.5 and above,
- is to use the existing sorting
- algorithm initially, and fall back to a O(N (log N)^2)
- algorithm if the standard algorithm gets into difficulties.
-<LI>The compressed file format was never designed to be
-
- handled by a library, and I have had to jump though
- some hoops to produce an efficient implementation of
- decompression. It's a bit hairy. Try passing
- <CODE>decompress.c</CODE> through the C preprocessor
- and you'll see what I mean. Much of this complexity
- could have been avoided if the compressed size of
- each block of data was recorded in the data stream.
-<LI>An Adler-32 checksum, rather than a CRC32 checksum,
-
- would be faster to compute.
-</UL>
-
-<P>
-It would be fair to say that the <CODE>bzip2</CODE> format was frozen
-before I properly and fully understood the performance
-consequences of doing so.
-
-</P>
-<P>
-Improvements which I was able to incorporate into
-0.9.0, despite using the same file format, are:
-
-<UL>
-<LI>Single array implementation of the inverse BWT. This
-
- significantly speeds up decompression, presumably
- because it reduces the number of cache misses.
-<LI>Faster inverse MTF transform for large MTF values. The
-
- new implementation is based on the notion of sliding blocks
- of values.
-<LI><CODE>bzip2-0.9.0</CODE> now reads and writes files with <CODE>fread</CODE>
-
- and <CODE>fwrite</CODE>; version 0.1 used <CODE>putc</CODE> and <CODE>getc</CODE>.
- Duh! Well, you live and learn.
-
-</UL>
-
-<P>
-Further ahead, it would be nice
-to be able to do random access into files. This will
-require some careful design of compressed file formats.
-
-</P>
-
-
-
-<H2><A NAME="SEC45" HREF="manual_toc.html#TOC45">Portability issues</A></H2>
-<P>
-After some consideration, I have decided not to use
-GNU <CODE>autoconf</CODE> to configure 0.9.5 or 1.0.
-
-</P>
-<P>
-<CODE>autoconf</CODE>, admirable and wonderful though it is,
-mainly assists with portability problems between Unix-like
-platforms. But <CODE>bzip2</CODE> doesn't have much in the way
-of portability problems on Unix; most of the difficulties appear
-when porting to the Mac, or to Microsoft's operating systems.
-<CODE>autoconf</CODE> doesn't help in those cases, and brings in a
-whole load of new complexity.
-
-</P>
-<P>
-Most people should be able to compile the library and program
-under Unix straight out-of-the-box, so to speak, especially
-if you have a version of GNU C available.
-
-</P>
-<P>
-There are a couple of <CODE>__inline__</CODE> directives in the code. GNU C
-(<CODE>gcc</CODE>) should be able to handle them. If you're not using
-GNU C, your C compiler shouldn't see them at all.
-If your compiler does, for some reason, see them and doesn't
-like them, just <CODE>#define</CODE> <CODE>__inline__</CODE> to be <CODE>/* */</CODE>. One
-easy way to do this is to compile with the flag <CODE>-D__inline__=</CODE>,
-which should be understood by most Unix compilers.
-
-</P>
-<P>
-If you still have difficulties, try compiling with the macro
-<CODE>BZ_STRICT_ANSI</CODE> defined. This should enable you to build the
-library in a strictly ANSI compliant environment. Building the program
-itself like this is dangerous and not supported, since you remove
-<CODE>bzip2</CODE>'s checks against compressing directories, symbolic links,
-devices, and other not-really-a-file entities. This could cause
-filesystem corruption!
-
-</P>
-<P>
-One other thing: if you create a <CODE>bzip2</CODE> binary for public
-distribution, please try and link it statically (<CODE>gcc -s</CODE>). This
-avoids all sorts of library-version issues that others may encounter
-later on.
-
-</P>
-<P>
-If you build <CODE>bzip2</CODE> on Win32, you must set <CODE>BZ_UNIX</CODE> to 0 and
-<CODE>BZ_LCCWIN32</CODE> to 1, in the file <CODE>bzip2.c</CODE>, before compiling.
-Otherwise the resulting binary won't work correctly.
-
-</P>
-
-
-
-<H2><A NAME="SEC46" HREF="manual_toc.html#TOC46">Reporting bugs</A></H2>
-<P>
-I tried pretty hard to make sure <CODE>bzip2</CODE> is
-bug free, both by design and by testing. Hopefully
-you'll never need to read this section for real.
-
-</P>
-<P>
-Nevertheless, if <CODE>bzip2</CODE> dies with a segmentation
-fault, a bus error or an internal assertion failure, it
-will ask you to email me a bug report. Experience with
-version 0.1 shows that almost all these problems can
-be traced to either compiler bugs or hardware problems.
-
-<UL>
-<LI>
-
-Recompile the program with no optimisation, and see if it
-works. And/or try a different compiler.
-I heard all sorts of stories about various flavours
-of GNU C (and other compilers) generating bad code for
-<CODE>bzip2</CODE>, and I've run across two such examples myself.
-
-2.7.X versions of GNU C are known to generate bad code from
-time to time, at high optimisation levels.
-If you get problems, try using the flags
-<CODE>-O2</CODE> <CODE>-fomit-frame-pointer</CODE> <CODE>-fno-strength-reduce</CODE>.
-You should specifically <EM>not</EM> use <CODE>-funroll-loops</CODE>.
-
-You may notice that the Makefile runs six tests as part of
-the build process. If the program passes all of these, it's
-a pretty good (but not 100%) indication that the compiler has
-done its job correctly.
-<LI>
-
-If <CODE>bzip2</CODE> crashes randomly, and the crashes are not
-repeatable, you may have a flaky memory subsystem. <CODE>bzip2</CODE>
-really hammers your memory hierarchy, and if it's a bit marginal,
-you may get these problems. Ditto if your disk or I/O subsystem
-is slowly failing. Yup, this really does happen.
-
-Try using a different machine of the same type, and see if
-you can repeat the problem.
-<LI>This isn't really a bug, but ... If <CODE>bzip2</CODE> tells
-
-you your file is corrupted on decompression, and you
-obtained the file via FTP, there is a possibility that you
-forgot to tell FTP to do a binary mode transfer. That absolutely
-will cause the file to be non-decompressible. You'll have to transfer
-it again.
-</UL>
-
-<P>
-If you've incorporated <CODE>libbzip2</CODE> into your own program
-and are getting problems, please, please, please, check that the
-parameters you are passing in calls to the library, are
-correct, and in accordance with what the documentation says
-is allowable. I have tried to make the library robust against
-such problems, but I'm sure I haven't succeeded.
-
-</P>
-<P>
-Finally, if the above comments don't help, you'll have to send
-me a bug report. Now, it's just amazing how many people will
-send me a bug report saying something like
-
-<PRE>
- bzip2 crashed with segmentation fault on my machine
-</PRE>
-
-<P>
-and absolutely nothing else. Needless to say, a such a report
-is <EM>totally, utterly, completely and comprehensively 100% useless;
-a waste of your time, my time, and net bandwidth</EM>.
-With no details at all, there's no way I can possibly begin
-to figure out what the problem is.
-
-</P>
-<P>
-The rules of the game are: facts, facts, facts. Don't omit
-them because "oh, they won't be relevant". At the bare
-minimum:
-
-<PRE>
- Machine type. Operating system version.
- Exact version of <CODE>bzip2</CODE> (do <CODE>bzip2 -V</CODE>).
- Exact version of the compiler used.
- Flags passed to the compiler.
-</PRE>
-
-<P>
-However, the most important single thing that will help me is
-the file that you were trying to compress or decompress at the
-time the problem happened. Without that, my ability to do anything
-more than speculate about the cause, is limited.
-
-</P>
-<P>
-Please remember that I connect to the Internet with a modem, so
-you should contact me before mailing me huge files.
-
-</P>
-
-
-
-<H2><A NAME="SEC47" HREF="manual_toc.html#TOC47">Did you get the right package?</A></H2>
-
-<P>
-<CODE>bzip2</CODE> is a resource hog. It soaks up large amounts of CPU cycles
-and memory. Also, it gives very large latencies. In the worst case, you
-can feed many megabytes of uncompressed data into the library before
-getting any compressed output, so this probably rules out applications
-requiring interactive behaviour.
-
-</P>
-<P>
-These aren't faults of my implementation, I hope, but more
-an intrinsic property of the Burrows-Wheeler transform (unfortunately).
-Maybe this isn't what you want.
-
-</P>
-<P>
-If you want a compressor and/or library which is faster, uses less
-memory but gets pretty good compression, and has minimal latency,
-consider Jean-loup
-Gailly's and Mark Adler's work, <CODE>zlib-1.1.2</CODE> and
-<CODE>gzip-1.2.4</CODE>. Look for them at
-
-</P>
-<P>
-<CODE>http://www.cdrom.com/pub/infozip/zlib</CODE> and
-<CODE>http://www.gzip.org</CODE> respectively.
-
-</P>
-<P>
-For something faster and lighter still, you might try Markus F X J
-Oberhumer's <CODE>LZO</CODE> real-time compression/decompression library, at
-<BR> <CODE>http://wildsau.idv.uni-linz.ac.at/mfx/lzo.html</CODE>.
-
-</P>
-<P>
-If you want to use the <CODE>bzip2</CODE> algorithms to compress small blocks
-of data, 64k bytes or smaller, for example on an on-the-fly disk
-compressor, you'd be well advised not to use this library. Instead,
-I've made a special library tuned for that kind of use. It's part of
-<CODE>e2compr-0.40</CODE>, an on-the-fly disk compressor for the Linux
-<CODE>ext2</CODE> filesystem. Look at
-<CODE>http://www.netspace.net.au/~reiter/e2compr</CODE>.
-
-</P>
-
-
-
-<H2><A NAME="SEC48" HREF="manual_toc.html#TOC48">Testing</A></H2>
-
-<P>
-A record of the tests I've done.
-
-</P>
-<P>
-First, some data sets:
-
-<UL>
-<LI>B: a directory containing 6001 files, one for every length in the
-
- range 0 to 6000 bytes. The files contain random lowercase
- letters. 18.7 megabytes.
-<LI>H: my home directory tree. Documents, source code, mail files,
-
- compressed data. H contains B, and also a directory of
- files designed as boundary cases for the sorting; mostly very
- repetitive, nasty files. 565 megabytes.
-<LI>A: directory tree holding various applications built from source:
-
- <CODE>egcs</CODE>, <CODE>gcc-2.8.1</CODE>, KDE, GTK, Octave, etc.
- 2200 megabytes.
-</UL>
-
-<P>
-The tests conducted are as follows. Each test means compressing
-(a copy of) each file in the data set, decompressing it and
-comparing it against the original.
-
-</P>
-<P>
-First, a bunch of tests with block sizes and internal buffer
-sizes set very small,
-to detect any problems with the
-blocking and buffering mechanisms.
-This required modifying the source code so as to try to
-break it.
-
-<OL>
-<LI>Data set H, with
-
- buffer size of 1 byte, and block size of 23 bytes.
-<LI>Data set B, buffer sizes 1 byte, block size 1 byte.
-
-<LI>As (2) but small-mode decompression.
-
-<LI>As (2) with block size 2 bytes.
-
-<LI>As (2) with block size 3 bytes.
-
-<LI>As (2) with block size 4 bytes.
-
-<LI>As (2) with block size 5 bytes.
-
-<LI>As (2) with block size 6 bytes and small-mode decompression.
-
-<LI>H with buffer size of 1 byte, but normal block
-
- size (up to 900000 bytes).
-</OL>
-
-<P>
-Then some tests with unmodified source code.
-
-<OL>
-<LI>H, all settings normal.
-
-<LI>As (1), with small-mode decompress.
-
-<LI>H, compress with flag <CODE>-1</CODE>.
-
-<LI>H, compress with flag <CODE>-s</CODE>, decompress with flag <CODE>-s</CODE>.
-
-<LI>Forwards compatibility: H, <CODE>bzip2-0.1pl2</CODE> compressing,
-
- <CODE>bzip2-0.9.5</CODE> decompressing, all settings normal.
-<LI>Backwards compatibility: H, <CODE>bzip2-0.9.5</CODE> compressing,
-
- <CODE>bzip2-0.1pl2</CODE> decompressing, all settings normal.
-<LI>Bigger tests: A, all settings normal.
-
-<LI>As (7), using the fallback (Sadakane-like) sorting algorithm.
-
-<LI>As (8), compress with flag <CODE>-1</CODE>, decompress with flag
-
- <CODE>-s</CODE>.
-<LI>H, using the fallback sorting algorithm.
-
-<LI>Forwards compatibility: A, <CODE>bzip2-0.1pl2</CODE> compressing,
-
- <CODE>bzip2-0.9.5</CODE> decompressing, all settings normal.
-<LI>Backwards compatibility: A, <CODE>bzip2-0.9.5</CODE> compressing,
-
- <CODE>bzip2-0.1pl2</CODE> decompressing, all settings normal.
-<LI>Misc test: about 400 megabytes of <CODE>.tar</CODE> files with
-
- <CODE>bzip2</CODE> compiled with Checker (a memory access error
- detector, like Purify).
-<LI>Misc tests to make sure it builds and runs ok on non-Linux/x86
-
- platforms.
-</OL>
-
-<P>
-These tests were conducted on a 225 MHz IDT WinChip machine, running
-Linux 2.0.36. They represent nearly a week of continuous computation.
-All tests completed successfully.
-
-</P>
-
-
-
-<H2><A NAME="SEC49" HREF="manual_toc.html#TOC49">Further reading</A></H2>
-<P>
-<CODE>bzip2</CODE> is not research work, in the sense that it doesn't present
-any new ideas. Rather, it's an engineering exercise based on existing
-ideas.
-
-</P>
-<P>
-Four documents describe essentially all the ideas behind <CODE>bzip2</CODE>:
-
-<PRE>
-Michael Burrows and D. J. Wheeler:
- "A block-sorting lossless data compression algorithm"
- 10th May 1994.
- Digital SRC Research Report 124.
- ftp://ftp.digital.com/pub/DEC/SRC/research-reports/SRC-124.ps.gz
- If you have trouble finding it, try searching at the
- New Zealand Digital Library, http://www.nzdl.org.
-
-Daniel S. Hirschberg and Debra A. LeLewer
- "Efficient Decoding of Prefix Codes"
- Communications of the ACM, April 1990, Vol 33, Number 4.
- You might be able to get an electronic copy of this
- from the ACM Digital Library.
-
-David J. Wheeler
- Program bred3.c and accompanying document bred3.ps.
- This contains the idea behind the multi-table Huffman
- coding scheme.
- ftp://ftp.cl.cam.ac.uk/users/djw3/
-
-Jon L. Bentley and Robert Sedgewick
- "Fast Algorithms for Sorting and Searching Strings"
- Available from Sedgewick's web page,
- www.cs.princeton.edu/~rs
-</PRE>
-
-<P>
-The following paper gives valuable additional insights into the
-algorithm, but is not immediately the basis of any code
-used in bzip2.
-
-<PRE>
-Peter Fenwick:
- Block Sorting Text Compression
- Proceedings of the 19th Australasian Computer Science Conference,
- Melbourne, Australia. Jan 31 - Feb 2, 1996.
- ftp://ftp.cs.auckland.ac.nz/pub/peter-f/ACSC96paper.ps
-</PRE>
-
-<P>
-Kunihiko Sadakane's sorting algorithm, mentioned above,
-is available from:
-
-<PRE>
-http://naomi.is.s.u-tokyo.ac.jp/~sada/papers/Sada98b.ps.gz
-</PRE>
-
-<P>
-The Manber-Myers suffix array construction
-algorithm is described in a paper
-available from:
-
-<PRE>
-http://www.cs.arizona.edu/people/gene/PAPERS/suffix.ps
-</PRE>
-
-<P>
-Finally, the following paper documents some recent investigations
-I made into the performance of sorting algorithms:
-
-<PRE>
-Julian Seward:
- On the Performance of BWT Sorting Algorithms
- Proceedings of the IEEE Data Compression Conference 2000
- Snowbird, Utah. 28-30 March 2000.
-</PRE>
-
-<P><HR><P>
-<p>Go to the <A HREF="manual_1.html">first</A>, <A HREF="manual_3.html">previous</A>, next, last section, <A HREF="manual_toc.html">table of contents</A>.
-</BODY>
-</HTML>
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-<HEAD>
-<!-- This HTML file has been created by texi2html 1.54
- from manual.texi on 23 March 2000 -->
-
-<TITLE>bzip2 and libbzip2 - Table of Contents</TITLE>
-
-</HEAD>
-<BODY>
-<H1>bzip2 and libbzip2</H1>
-<H2>a program and library for data compression</H2>
-<H2>copyright (C) 1996-2000 Julian Seward</H2>
-<H2>version 1.0 of 21 March 2000</H2>
-<ADDRESS>Julian Seward</ADDRESS>
-<P>
-<P><HR><P>
-
-<P>
-This program, <CODE>bzip2</CODE>,
-and associated library <CODE>libbzip2</CODE>, are
-Copyright (C) 1996-2000 Julian R Seward. All rights reserved.
-
-</P>
-<P>
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions
-are met:
-
-<UL>
-<LI>
-
- Redistributions of source code must retain the above copyright
- notice, this list of conditions and the following disclaimer.
-<LI>
-
- The origin of this software must not be misrepresented; you must
- not claim that you wrote the original software. If you use this
- software in a product, an acknowledgment in the product
- documentation would be appreciated but is not required.
-<LI>
-
- Altered source versions must be plainly marked as such, and must
- not be misrepresented as being the original software.
-<LI>
-
- The name of the author may not be used to endorse or promote
- products derived from this software without specific prior written
- permission.
-</UL>
-
-<P>
-THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS
-OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
-DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
-GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
-WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
-NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-</P>
-<P>
-Julian Seward, Cambridge, UK.
-
-</P>
-<P>
-<CODE>jseward@acm.org</CODE>
-
-</P>
-<P>
-<CODE>http://sourceware.cygnus.com/bzip2</CODE>
-
-</P>
-<P>
-<CODE>http://www.cacheprof.org</CODE>
-
-</P>
-<P>
-<CODE>http://www.muraroa.demon.co.uk</CODE>
-
-</P>
-<P>
-<CODE>bzip2</CODE>/<CODE>libbzip2</CODE> version 1.0 of 21 March 2000.
-
-</P>
-<P>
-PATENTS: To the best of my knowledge, <CODE>bzip2</CODE> does not use any patented
-algorithms. However, I do not have the resources available to carry out
-a full patent search. Therefore I cannot give any guarantee of the
-above statement.
-
-</P>
-
-<UL>
-<LI><A NAME="TOC1" HREF="manual_1.html#SEC1">Introduction</A>
-<LI><A NAME="TOC2" HREF="manual_2.html#SEC2">How to use <CODE>bzip2</CODE></A>
-<UL>
-<UL>
-<UL>
-<LI><A NAME="TOC3" HREF="manual_2.html#SEC3">NAME</A>
-<LI><A NAME="TOC4" HREF="manual_2.html#SEC4">SYNOPSIS</A>
-<LI><A NAME="TOC5" HREF="manual_2.html#SEC5">DESCRIPTION</A>
-<LI><A NAME="TOC6" HREF="manual_2.html#SEC6">OPTIONS</A>
-<LI><A NAME="TOC7" HREF="manual_2.html#SEC7">MEMORY MANAGEMENT</A>
-<LI><A NAME="TOC8" HREF="manual_2.html#SEC8">RECOVERING DATA FROM DAMAGED FILES</A>
-<LI><A NAME="TOC9" HREF="manual_2.html#SEC9">PERFORMANCE NOTES</A>
-<LI><A NAME="TOC10" HREF="manual_2.html#SEC10">CAVEATS</A>
-<LI><A NAME="TOC11" HREF="manual_2.html#SEC11">AUTHOR</A>
-</UL>
-</UL>
-</UL>
-<LI><A NAME="TOC12" HREF="manual_3.html#SEC12">Programming with <CODE>libbzip2</CODE></A>
-<UL>
-<LI><A NAME="TOC13" HREF="manual_3.html#SEC13">Top-level structure</A>
-<UL>
-<LI><A NAME="TOC14" HREF="manual_3.html#SEC14">Low-level summary</A>
-<LI><A NAME="TOC15" HREF="manual_3.html#SEC15">High-level summary</A>
-<LI><A NAME="TOC16" HREF="manual_3.html#SEC16">Utility functions summary</A>
-</UL>
-<LI><A NAME="TOC17" HREF="manual_3.html#SEC17">Error handling</A>
-<LI><A NAME="TOC18" HREF="manual_3.html#SEC18">Low-level interface</A>
-<UL>
-<LI><A NAME="TOC19" HREF="manual_3.html#SEC19"><CODE>BZ2_bzCompressInit</CODE></A>
-<LI><A NAME="TOC20" HREF="manual_3.html#SEC20"><CODE>BZ2_bzCompress</CODE></A>
-<LI><A NAME="TOC21" HREF="manual_3.html#SEC21"><CODE>BZ2_bzCompressEnd</CODE></A>
-<LI><A NAME="TOC22" HREF="manual_3.html#SEC22"><CODE>BZ2_bzDecompressInit</CODE></A>
-<LI><A NAME="TOC23" HREF="manual_3.html#SEC23"><CODE>BZ2_bzDecompress</CODE></A>
-<LI><A NAME="TOC24" HREF="manual_3.html#SEC24"><CODE>BZ2_bzDecompressEnd</CODE></A>
-</UL>
-<LI><A NAME="TOC25" HREF="manual_3.html#SEC25">High-level interface</A>
-<UL>
-<LI><A NAME="TOC26" HREF="manual_3.html#SEC26"><CODE>BZ2_bzReadOpen</CODE></A>
-<LI><A NAME="TOC27" HREF="manual_3.html#SEC27"><CODE>BZ2_bzRead</CODE></A>
-<LI><A NAME="TOC28" HREF="manual_3.html#SEC28"><CODE>BZ2_bzReadGetUnused</CODE></A>
-<LI><A NAME="TOC29" HREF="manual_3.html#SEC29"><CODE>BZ2_bzReadClose</CODE></A>
-<LI><A NAME="TOC30" HREF="manual_3.html#SEC30"><CODE>BZ2_bzWriteOpen</CODE></A>
-<LI><A NAME="TOC31" HREF="manual_3.html#SEC31"><CODE>BZ2_bzWrite</CODE></A>
-<LI><A NAME="TOC32" HREF="manual_3.html#SEC32"><CODE>BZ2_bzWriteClose</CODE></A>
-<LI><A NAME="TOC33" HREF="manual_3.html#SEC33">Handling embedded compressed data streams</A>
-<LI><A NAME="TOC34" HREF="manual_3.html#SEC34">Standard file-reading/writing code</A>
-</UL>
-<LI><A NAME="TOC35" HREF="manual_3.html#SEC35">Utility functions</A>
-<UL>
-<LI><A NAME="TOC36" HREF="manual_3.html#SEC36"><CODE>BZ2_bzBuffToBuffCompress</CODE></A>
-<LI><A NAME="TOC37" HREF="manual_3.html#SEC37"><CODE>BZ2_bzBuffToBuffDecompress</CODE></A>
-</UL>
-<LI><A NAME="TOC38" HREF="manual_3.html#SEC38"><CODE>zlib</CODE> compatibility functions</A>
-<LI><A NAME="TOC39" HREF="manual_3.html#SEC39">Using the library in a <CODE>stdio</CODE>-free environment</A>
-<UL>
-<LI><A NAME="TOC40" HREF="manual_3.html#SEC40">Getting rid of <CODE>stdio</CODE></A>
-<LI><A NAME="TOC41" HREF="manual_3.html#SEC41">Critical error handling</A>
-</UL>
-<LI><A NAME="TOC42" HREF="manual_3.html#SEC42">Making a Windows DLL</A>
-</UL>
-<LI><A NAME="TOC43" HREF="manual_4.html#SEC43">Miscellanea</A>
-<UL>
-<LI><A NAME="TOC44" HREF="manual_4.html#SEC44">Limitations of the compressed file format</A>
-<LI><A NAME="TOC45" HREF="manual_4.html#SEC45">Portability issues</A>
-<LI><A NAME="TOC46" HREF="manual_4.html#SEC46">Reporting bugs</A>
-<LI><A NAME="TOC47" HREF="manual_4.html#SEC47">Did you get the right package?</A>
-<LI><A NAME="TOC48" HREF="manual_4.html#SEC48">Testing</A>
-<LI><A NAME="TOC49" HREF="manual_4.html#SEC49">Further reading</A>
-</UL>
-</UL>
-<P><HR><P>
-This document was generated on 23 March 2000 using the
-<A HREF="http://wwwcn.cern.ch/dci/texi2html/">texi2html</A>
-translator version 1.51a.</P>
-</BODY>
-</HTML>
+++ /dev/null
-
-/*-------------------------------------------------------------*/
-/*--- Table for randomising repetitive blocks ---*/
-/*--- randtable.c ---*/
-/*-------------------------------------------------------------*/
-
-/*--
- This file is a part of bzip2 and/or libbzip2, a program and
- library for lossless, block-sorting data compression.
-
- Copyright (C) 1996-2000 Julian R Seward. All rights reserved.
-
- Redistribution and use in source and binary forms, with or without
- modification, are permitted provided that the following conditions
- are met:
-
- 1. Redistributions of source code must retain the above copyright
- notice, this list of conditions and the following disclaimer.
-
- 2. The origin of this software must not be misrepresented; you must
- not claim that you wrote the original software. If you use this
- software in a product, an acknowledgment in the product
- documentation would be appreciated but is not required.
-
- 3. Altered source versions must be plainly marked as such, and must
- not be misrepresented as being the original software.
-
- 4. The name of the author may not be used to endorse or promote
- products derived from this software without specific prior written
- permission.
-
- THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
- OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
- DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
- GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
- Julian Seward, Cambridge, UK.
- jseward@acm.org
- bzip2/libbzip2 version 1.0 of 21 March 2000
-
- This program is based on (at least) the work of:
- Mike Burrows
- David Wheeler
- Peter Fenwick
- Alistair Moffat
- Radford Neal
- Ian H. Witten
- Robert Sedgewick
- Jon L. Bentley
-
- For more information on these sources, see the manual.
---*/
-
-
-#include "bzlib_private.h"
-
-
-/*---------------------------------------------*/
-Int32 BZ2_rNums[512] = {
- 619, 720, 127, 481, 931, 816, 813, 233, 566, 247,
- 985, 724, 205, 454, 863, 491, 741, 242, 949, 214,
- 733, 859, 335, 708, 621, 574, 73, 654, 730, 472,
- 419, 436, 278, 496, 867, 210, 399, 680, 480, 51,
- 878, 465, 811, 169, 869, 675, 611, 697, 867, 561,
- 862, 687, 507, 283, 482, 129, 807, 591, 733, 623,
- 150, 238, 59, 379, 684, 877, 625, 169, 643, 105,
- 170, 607, 520, 932, 727, 476, 693, 425, 174, 647,
- 73, 122, 335, 530, 442, 853, 695, 249, 445, 515,
- 909, 545, 703, 919, 874, 474, 882, 500, 594, 612,
- 641, 801, 220, 162, 819, 984, 589, 513, 495, 799,
- 161, 604, 958, 533, 221, 400, 386, 867, 600, 782,
- 382, 596, 414, 171, 516, 375, 682, 485, 911, 276,
- 98, 553, 163, 354, 666, 933, 424, 341, 533, 870,
- 227, 730, 475, 186, 263, 647, 537, 686, 600, 224,
- 469, 68, 770, 919, 190, 373, 294, 822, 808, 206,
- 184, 943, 795, 384, 383, 461, 404, 758, 839, 887,
- 715, 67, 618, 276, 204, 918, 873, 777, 604, 560,
- 951, 160, 578, 722, 79, 804, 96, 409, 713, 940,
- 652, 934, 970, 447, 318, 353, 859, 672, 112, 785,
- 645, 863, 803, 350, 139, 93, 354, 99, 820, 908,
- 609, 772, 154, 274, 580, 184, 79, 626, 630, 742,
- 653, 282, 762, 623, 680, 81, 927, 626, 789, 125,
- 411, 521, 938, 300, 821, 78, 343, 175, 128, 250,
- 170, 774, 972, 275, 999, 639, 495, 78, 352, 126,
- 857, 956, 358, 619, 580, 124, 737, 594, 701, 612,
- 669, 112, 134, 694, 363, 992, 809, 743, 168, 974,
- 944, 375, 748, 52, 600, 747, 642, 182, 862, 81,
- 344, 805, 988, 739, 511, 655, 814, 334, 249, 515,
- 897, 955, 664, 981, 649, 113, 974, 459, 893, 228,
- 433, 837, 553, 268, 926, 240, 102, 654, 459, 51,
- 686, 754, 806, 760, 493, 403, 415, 394, 687, 700,
- 946, 670, 656, 610, 738, 392, 760, 799, 887, 653,
- 978, 321, 576, 617, 626, 502, 894, 679, 243, 440,
- 680, 879, 194, 572, 640, 724, 926, 56, 204, 700,
- 707, 151, 457, 449, 797, 195, 791, 558, 945, 679,
- 297, 59, 87, 824, 713, 663, 412, 693, 342, 606,
- 134, 108, 571, 364, 631, 212, 174, 643, 304, 329,
- 343, 97, 430, 751, 497, 314, 983, 374, 822, 928,
- 140, 206, 73, 263, 980, 736, 876, 478, 430, 305,
- 170, 514, 364, 692, 829, 82, 855, 953, 676, 246,
- 369, 970, 294, 750, 807, 827, 150, 790, 288, 923,
- 804, 378, 215, 828, 592, 281, 565, 555, 710, 82,
- 896, 831, 547, 261, 524, 462, 293, 465, 502, 56,
- 661, 821, 976, 991, 658, 869, 905, 758, 745, 193,
- 768, 550, 608, 933, 378, 286, 215, 979, 792, 961,
- 61, 688, 793, 644, 986, 403, 106, 366, 905, 644,
- 372, 567, 466, 434, 645, 210, 389, 550, 919, 135,
- 780, 773, 635, 389, 707, 100, 626, 958, 165, 504,
- 920, 176, 193, 713, 857, 265, 203, 50, 668, 108,
- 645, 990, 626, 197, 510, 357, 358, 850, 858, 364,
- 936, 638
-};
-
-
-/*-------------------------------------------------------------*/
-/*--- end randtable.c ---*/
-/*-------------------------------------------------------------*/
+++ /dev/null
-This file is exceedingly boring. If you find yourself
-reading it, please (1) take it from me that you can safely
-guess what the rest of the file says, and (2) seek professional
-help.
-
-ps. there are no further sarcastic remarks in this file.
-
-ugh
-ugh
-ugh
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+++ /dev/null
-
-/* spew out a thoroughly gigantic file designed so that bzip2
- can compress it reasonably rapidly. This is to help test
- support for large files (> 2GB) in a reasonable amount of time.
- I suggest you use the undocumented --exponential option to
- bzip2 when compressing the resulting file; this saves a bit of
- time. Note: *don't* bother with --exponential when compressing
- Real Files; it'll just waste a lot of CPU time :-)
- (but is otherwise harmless).
-*/
-
-#define _FILE_OFFSET_BITS 64
-
-#include <stdio.h>
-#include <stdlib.h>
-
-/* The number of megabytes of junk to spew out (roughly) */
-#define MEGABYTES 5000
-
-#define N_BUF 1000000
-char buf[N_BUF];
-
-int main ( int argc, char** argv )
-{
- int ii, kk, p;
- srandom(1);
- setbuffer ( stdout, buf, N_BUF );
- for (kk = 0; kk < MEGABYTES * 515; kk+=3) {
- p = 25+random()%50;
- for (ii = 0; ii < p; ii++)
- printf ( "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" );
- for (ii = 0; ii < p-1; ii++)
- printf ( "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb" );
- for (ii = 0; ii < p+1; ii++)
- printf ( "ccccccccccccccccccccccccccccccccccccc" );
- }
- fflush(stdout);
- return 0;
-}
+++ /dev/null
-
-/* A test program written to test robustness to decompression of
- corrupted data. Usage is
- unzcrash filename
- and the program will read the specified file, compress it (in memory),
- and then repeatedly decompress it, each time with a different bit of
- the compressed data inverted, so as to test all possible one-bit errors.
- This should not cause any invalid memory accesses. If it does,
- I want to know about it!
-
- p.s. As you can see from the above description, the process is
- incredibly slow. A file of size eg 5KB will cause it to run for
- many hours.
-*/
-
-#include <stdio.h>
-#include <assert.h>
-#include "bzlib.h"
-
-#define M_BLOCK 1000000
-
-typedef unsigned char uchar;
-
-#define M_BLOCK_OUT (M_BLOCK + 1000000)
-uchar inbuf[M_BLOCK];
-uchar outbuf[M_BLOCK_OUT];
-uchar zbuf[M_BLOCK + 600 + (M_BLOCK / 100)];
-
-int nIn, nOut, nZ;
-
-static char *bzerrorstrings[] = {
- "OK"
- ,"SEQUENCE_ERROR"
- ,"PARAM_ERROR"
- ,"MEM_ERROR"
- ,"DATA_ERROR"
- ,"DATA_ERROR_MAGIC"
- ,"IO_ERROR"
- ,"UNEXPECTED_EOF"
- ,"OUTBUFF_FULL"
- ,"???" /* for future */
- ,"???" /* for future */
- ,"???" /* for future */
- ,"???" /* for future */
- ,"???" /* for future */
- ,"???" /* for future */
-};
-
-void flip_bit ( int bit )
-{
- int byteno = bit / 8;
- int bitno = bit % 8;
- uchar mask = 1 << bitno;
- //fprintf ( stderr, "(byte %d bit %d mask %d)",
- // byteno, bitno, (int)mask );
- zbuf[byteno] ^= mask;
-}
-
-int main ( int argc, char** argv )
-{
- FILE* f;
- int r;
- int bit;
- int i;
-
- if (argc != 2) {
- fprintf ( stderr, "usage: unzcrash filename\n" );
- return 1;
- }
-
- f = fopen ( argv[1], "r" );
- if (!f) {
- fprintf ( stderr, "unzcrash: can't open %s\n", argv[1] );
- return 1;
- }
-
- nIn = fread ( inbuf, 1, M_BLOCK, f );
- fprintf ( stderr, "%d bytes read\n", nIn );
-
- nZ = M_BLOCK;
- r = BZ2_bzBuffToBuffCompress (
- zbuf, &nZ, inbuf, nIn, 9, 0, 30 );
-
- assert (r == BZ_OK);
- fprintf ( stderr, "%d after compression\n", nZ );
-
- for (bit = 0; bit < nZ*8; bit++) {
- fprintf ( stderr, "bit %d ", bit );
- flip_bit ( bit );
- nOut = M_BLOCK_OUT;
- r = BZ2_bzBuffToBuffDecompress (
- outbuf, &nOut, zbuf, nZ, 0, 0 );
- fprintf ( stderr, " %d %s ", r, bzerrorstrings[-r] );
-
- if (r != BZ_OK) {
- fprintf ( stderr, "\n" );
- } else {
- if (nOut != nIn) {
- fprintf(stderr, "nIn/nOut mismatch %d %d\n", nIn, nOut );
- return 1;
- } else {
- for (i = 0; i < nOut; i++)
- if (inbuf[i] != outbuf[i]) {
- fprintf(stderr, "mismatch at %d\n", i );
- return 1;
- }
- if (i == nOut) fprintf(stderr, "really ok!\n" );
- }
- }
-
- flip_bit ( bit );
- }
-
-#if 0
- assert (nOut == nIn);
- for (i = 0; i < nOut; i++) {
- if (inbuf[i] != outbuf[i]) {
- fprintf ( stderr, "difference at %d !\n", i );
- return 1;
- }
- }
-#endif
-
- fprintf ( stderr, "all ok\n" );
- return 0;
-}
+++ /dev/null
-
-If compilation produces errors, or a large number of warnings,
-please read README.COMPILATION.PROBLEMS -- you might be able to
-adjust the flags in this Makefile to improve matters.
-
+++ /dev/null
-
-Doing 6 tests (3 compress, 3 uncompress) ...
-If there's a problem, things might stop at this point.
-
+++ /dev/null
-
-Checking test results. If any of the four "cmp"s which follow
-report any differences, something is wrong. If you can't easily
-figure out what, please let me know (jseward@acm.org).
-
+++ /dev/null
-
-If you got this far and the "cmp"s didn't complain, it looks
-like you're in business.
-
-To install in /usr/bin, /usr/lib, /usr/man and /usr/include, type
- make install
-To install somewhere else, eg, /xxx/yyy/{bin,lib,man,include}, type
- make install PREFIX=/xxx/yyy
-If you are (justifiably) paranoid and want to see what 'make install'
-is going to do, you can first do
- make -n install or
- make -n install PREFIX=/xxx/yyy respectively.
-The -n instructs make to show the commands it would execute, but
-not actually execute them.
-
-Instructions for use are in the preformatted manual page, in the file
-bzip2.txt. For more detailed documentation, read the full manual.
-It is available in Postscript form (manual.ps) and HTML form
-(manual_toc.html).
-
-You can also do "bzip2 --help" to see some helpful information.
-"bzip2 -L" displays the software license.
-
+++ /dev/null
-0.68 2004-10-20 cturner
- * make it compile again with rpm 4.0
-
-0.67 2004-09-15 cturner
- * add support for manipulating headers and header lists
-
-0.66 2004-04-14 cturner
- * add changelog support and doc updates from Ville Skytta <ville.skytta@iki.fi>
-
-0.65 2003-12-08 cturner
- * add RPM2->open_hdlist to read hdlists created by anaconda's genhdlist
- * fix some typemap entries to allow compilation on older gcc's onces again
-
-0.63 2003-03-16 cturner
- * add support for install/erase from James Olin Oden; experimental but looks solid. API may change.
-
- * Fix sort bug found by James Olin Oden
-
-0.62 2003-03-16 cturner
- * fix a few rpmlib 4.0.4/perl 5.6.x issues
-
-0.61 2003-03-10 cturner
- * test release for CPAN
-
-0.60 2003-03-08 cturner
- * Add tagformat method on header objects from James Olin Oden
-
- * Redo a lot of the XS bindings to properly perform
- refcounting on underlying C objects
-
- * Add expand_macro call to... expand a macro!
-
- * Add ability to change VS flags on open_package.. more coming
+++ /dev/null
-Changes
-Makefile.PL
-MANIFEST
-README
-RPM2.pm
-RPM2.xs
-test.pl
-test-rpm-1.0-1.noarch.rpm
-test-rpm-1.0-1.src.rpm
-hdlist-test.hdr
-typemap
-META.yml Module meta-data (added by MakeMaker)
+++ /dev/null
-use ExtUtils::MakeMaker;
-# See lib/ExtUtils/MakeMaker.pm for details of how to influence
-# the contents of the Makefile that is written.
-
-my $extra_libs = $ENV{EXTRALIBS};
-my $libs = "$extra_libs -lrpm -lrpmdb -lrpmio -lpopt";
-
-# try to be smart about which shared libs we should load.
-# use the .la file. probably linux only.
-
-my $filename = '/usr/lib/librpm.la';
-$filename = '/usr/lib64/librpm.la' unless -e $filename;
-
-if (open FH, "<$filename") {
- my ($line, @rest) = grep { /^dependency_libs=/ } <FH>;
- if ($line and not @rest) {
- if ($line =~ /^dependency_libs='(.*)'$/) {
- my $l = $1;
- my @l = split /\s+/, $l;
- @l = grep { /^-l/ } @l;
- $libs = "$libs -lrpm @l";
- }
- }
-}
-
-my @defines;
-# detect which rpm is running. ugly but necessary... for now.
-if (-e '/usr/include/rpm/rpmts.h') {
- push @defines, '-DRPM2_RPM41';
-}
-else {
- push @defines, '-DRPM2_RPM40';
-}
-
-WriteMakefile(
- 'NAME' => 'RPM2',
- 'VERSION_FROM' => 'RPM2.pm', # finds $VERSION
- 'PREREQ_PM' => {}, # e.g., Module::Name => 1.1
- 'LIBS' => [ $libs ], # e.g., '-lm'
- 'DEFINE' => join(" ", @defines), # e.g., '-DHAVE_SOMETHING'
- 'INC' => '-I/usr/include/rpm', # e.g., '-I/usr/include/other'
- 'TYPEMAPS' => [ 'typemap' ],
- 'OPTIMIZE' => '-g'
-);
+++ /dev/null
-RPM2 version 0.01
-=================
-
-The README is used to introduce the module and provide instructions on
-how to install the module, any machine dependencies it may have (for
-example C compilers and installed libraries) and any other information
-that should be provided before the module is installed.
-
-A README file is required for CPAN modules since CPAN extracts the
-README file from a module distribution so that people browsing the
-archive can use it get an idea of the modules uses. It is usually a
-good idea to provide version information here so that people can
-decide whether fixes for the module are worth downloading.
-
-INSTALLATION
-
-To install this module type the following:
-
- perl Makefile.PL
- make
- make test
- make install
-
-DEPENDENCIES
-
-This module requires these other modules and libraries:
-
- blah blah blah
-
-COPYRIGHT AND LICENCE
-
-Put the correct copyright and licence information here.
-
-Copyright (C) 2001 A. U. Thor blah blah blah
-
+++ /dev/null
-package RPM2;
-
-use 5.00503;
-use strict;
-use DynaLoader;
-use Cwd qw/realpath/;
-use File::Basename qw/basename dirname/;
-use File::Spec ();
-
-use vars qw/$VERSION/;
-$VERSION = '0.68';
-use vars qw/@ISA/;
-@ISA = qw/DynaLoader/;
-
-bootstrap RPM2 $VERSION;
-
-foreach my $tag (keys %RPM2::constants) {
- my $sub = q {
- sub [[method]] {
- my $self = shift;
- return $RPM2::constants{[[tag]]};
- }
- };
-
- my $method = lc $tag;
- $method =~ s/^rpm//;
- $sub =~ s/\[\[method\]\]/$method/g;
- $sub =~ s/\[\[tag\]\]/$tag/g;
- eval $sub;
-
- if ($@) {
- die $@;
- }
-}
-
-sub open_rpm_db {
- my $class = shift;
- my %params = @_;
-
- my $self = bless { }, "RPM2::DB";
- if ($params{-path}) {
- $class->add_macro("_dbpath", $params{-path});
- $self->{c_db} = RPM2::_open_rpm_db($params{-readwrite} ? 1 : 0);
- $class->delete_macro("_dbpath");
- }
- else {
- $self->{c_db} = RPM2::_open_rpm_db($params{-readwrite} ? 1 : 0);
- }
-
- return $self;
-}
-
-sub open_hdlist {
- my $class = shift;
- my $file = shift;
-
- open FH, "<$file"
- or die "Can't open $file: $!";
-
- my @ret;
- while (1) {
- my ($hdr) = RPM2::_read_from_file(*FH);
- last unless $hdr;
-
- push @ret, RPM2::Header->_new_raw($hdr);
- }
-
- close FH;
- return @ret;
-}
-
-sub open_package {
- my $class = shift;
- my $file = shift;
- my $flags = shift;
-
- if (RPM2->rpm_api_version > 4.0 and not defined $flags) {
- $flags = RPM2->vsf_default;
- }
- $flags ||= 0;
-
- open FH, "<$file"
- or die "Can't open $file: $!";
-
- my $hdr = RPM2::_read_package_info(*FH, $flags);
- close FH;
-
- my ($filename, $path) = (basename($file), realpath(dirname($file)));
- $hdr = RPM2::Header->_new_raw($hdr, File::Spec->catfile($path, $filename));
- return $hdr;
-}
-
-sub create_transaction
-{
- my $class = shift;
- my $flags = shift;
- my $t;
-
- return undef if (RPM2->rpm_api_version <= 4.0);
- if(not defined $flags) {
- $flags = RPM2->vsf_default;
- }
-
- $t = RPM2::_create_transaction($flags);
- $t = RPM2::Transaction->_new_raw($t);
-
- return $t;
-}
-
-package RPM2::DB;
-
-sub find_all_iter {
- my $self = shift;
-
- return RPM2::PackageIterator->new_iterator($self, "RPMTAG_NAME")
-}
-
-sub find_all {
- my $self = shift;
-
- return RPM2::PackageIterator->new_iterator($self)->expand_iter();
-}
-
-sub find_by_name_iter {
- my $self = shift;
- my $name = shift;
-
- return RPM2::PackageIterator->new_iterator($self, "RPMTAG_NAME", $name);
-}
-sub find_by_name {
- my $self = shift;
- my $name = shift;
-
- return $self->find_by_name_iter($name)->expand_iter;
-}
-
-sub find_by_provides_iter {
- my $self = shift;
- my $name = shift;
-
- return RPM2::PackageIterator->new_iterator($self, "RPMTAG_PROVIDES", $name);
-}
-sub find_by_provides {
- my $self = shift;
- my $name = shift;
-
- return $self->find_by_provides_iter($name)->expand_iter;
-}
-
-sub find_by_requires_iter {
- my $self = shift;
- my $name = shift;
-
- return RPM2::PackageIterator->new_iterator($self, "RPMTAG_REQUIRENAME", $name);
-}
-
-sub find_by_requires {
- my $self = shift;
- my $name = shift;
-
- return $self->find_by_requires_iter($name)->expand_iter;
-}
-
-sub find_by_file_iter {
- my $self = shift;
- my $name = shift;
-
- return RPM2::PackageIterator->new_iterator($self, "RPMTAG_BASENAMES", $name);
-}
-
-sub find_by_file {
- my $self = shift;
- my $name = shift;
-
- return $self->find_by_file_iter($name)->expand_iter;
-}
-
-package RPM2::Header;
-
-use overload '<=>' => \&op_spaceship,
- 'cmp' => \&op_spaceship,
- 'bool' => \&op_bool;
-
-sub _new_raw {
- my $class = shift;
- my $c_header = shift;
- my $filename = shift;
- my $offset = shift;
-
- my $self = bless { }, $class;
- $self->{c_header} = $c_header;
- $self->{filename} = $filename if defined $filename;
- $self->{db_offset} = $offset if defined $offset;
-
- return $self;
-}
-
-sub tag {
- my $self = shift;
- my $tag = shift;
-
- $tag = uc "RPMTAG_$tag";
-
- die "tag $tag invalid"
- unless exists $RPM2::header_tag_map{$tag};
-
- return $self->{c_header}->tag_by_id($RPM2::header_tag_map{$tag});
-}
-
-sub tagformat {
- my $self = shift;
- my $format = shift;
-
- return RPM2::C::Header::_header_sprintf($self->{c_header}, $format);
-}
-
-sub compare {
- my $h1 = shift;
- my $h2 = shift;
-
- return RPM2::C::Header::_header_compare($h1->{c_header}, $h2->{c_header});
-}
-
-sub op_bool {
- my $self = shift;
-
- return defined($self) && defined($self->{c_header});
-}
-
-sub op_spaceship {
- my $h1 = shift;
- my $h2 = shift;
-
- my $ret = $h1->compare($h2);
-
- # rpmvercmp can return any neg/pos number; normalize here to -1, 0, 1
- return 1 if $ret > 0;
- return -1 if $ret < 0;
- return 0;
-}
-
-sub is_source_package {
- my $self = shift;
-
- return RPM2::C::Header::_header_is_source($self->{c_header});
-}
-
-sub filename {
- my $self = shift;
- if (exists $self->{filename}) {
- return $self->{filename};
- }
- return;
-}
-
-sub offset {
- my $self = shift;
- if (exists $self->{db_offset}) {
- return $self->{db_offset};
- }
- return;
-}
-
-sub as_nvre {
- my $self = shift;
- my $epoch = $self->tag('epoch');
- my $epoch_str = '';
-
- $epoch_str = "$epoch:" if defined $epoch;
-
- my $ret = $epoch_str . join("-", map { $self->tag($_) } qw/name version release/);
-
- return $ret;
-}
-
-foreach my $tag (keys %RPM2::header_tag_map) {
- $tag =~ s/^RPMTAG_//g;
-
- my $sub = q {
- sub [[method]] {
- my $self = shift;
- return $self->tag("[[tag]]");
- }
- };
-
- my $method = lc $tag;
- $sub =~ s/\[\[method\]\]/$method/g;
- $sub =~ s/\[\[tag\]\]/$tag/g;
- eval $sub;
-
- if ($@) {
- die $@;
- }
-}
-
-sub files {
- my $self = shift;
-
- if (not exists $self->{files}) {
- my @base_names = $self->tag('basenames');
- my @dir_names = $self->tag('dirnames');
- my @dir_indexes = $self->tag('dirindexes');
-
- my @files;
- foreach (0 .. $#base_names) {
- push @files, $dir_names[$dir_indexes[$_]] . $base_names[$_];
- }
-
- $self->{files} = \@files;
- }
-
- return @{$self->{files}};
-}
-
-sub changelog {
- my $self = shift;
-
- if (not exists $self->{changelog}) {
- my @cltimes = $self->tag('CHANGELOGTIME');
- my @clnames = $self->tag('CHANGELOGNAME');
- my @cltexts = $self->tag('CHANGELOGTEXT');
-
- my @changelog;
- foreach (0 .. $#cltimes) {
- push(@changelog,
- { time => $cltimes[$_],
- name => $clnames[$_],
- text => $cltexts[$_],
- });
- }
-
- $self->{changelog} = \@changelog;
- }
-
- return @{$self->{changelog}};
-}
-
-sub raw_header {
- my $self = shift;
-
- return RPM2::C::Header::_unload($self->{c_header});
-}
-
-package RPM2::PackageIterator;
-
-sub new_iterator {
- my $class = shift;
- my $db = shift;
- my $tag = shift;
- my $key = shift;
-
- my $self = bless { db => $db }, $class;
- $self->{c_iter} = RPM2::C::DB::_init_iterator($db->{c_db},
- $RPM2::header_tag_map{$tag},
- $key || "",
- defined $key ? length $key : 0);
- return $self;
-}
-
-sub next {
- my $self = shift;
-
- return unless $self->{c_iter};
- my ($hdr, $offset) = $self->{c_iter}->_iterator_next();
- return unless $hdr;
-
- my $ret = RPM2::Header->_new_raw($hdr, undef, $offset);
- return $ret;
-}
-
-sub expand_iter {
- my $self = shift;
-
- my @ret;
- while (my $h = $self->next) {
- push @ret, $h;
- }
-
- return @ret;
-}
-
-# make sure c_iter is destroyed before {db} so that we always free an
-# iterator before we free the db it came from
-
-sub DESTROY {
- my $self = shift;
- delete $self->{c_iter};
-}
-
-package RPM2::Transaction;
-
-sub _new_raw {
- my $class = shift;
- my $c_transaction = shift;
-
- my $self = bless { }, $class;
- $self->{c_transaction} = $c_transaction;
-
- return $self;
-}
-
-sub add_install {
- my $self = shift;
- my $h = shift;
- my $upgrade = shift || 0;
- my $fn;
-
- #
- # Must have a header to add
- return 0 if(!defined($h));
-
- #
- # Get filename
- $fn = $h->filename();
-
- # XXX: Need to add relocations at some point, but I think we live
- # without this for now (until I need it (-;).
- return RPM2::C::Transaction::_add_install($self->{'c_transaction'},
- $h->{'c_header'}, $fn, $upgrade)
-}
-
-sub add_erase {
- my $self = shift;
- my $h = shift;
- my $db_offset;
- my $fn;
-
- #
- # Must have a header to add
- return 0 if(!defined($h));
-
- #
- # Get record offset
- $db_offset = $h->offset();
- return 0 if(!defined($db_offset));
-
- # XXX: Need to add relocations at some point, but I think we live
- # without this for now (until I need it (-;).
- return RPM2::C::Transaction::_add_delete($self->{'c_transaction'},
- $h->{'c_header'}, $db_offset)
-}
-
-sub element_count {
- my $self = shift;
-
- return $self->{'c_transaction'}->_element_count();
-}
-
-sub close_db {
- my $self = shift;
-
- return $self->{'c_transaction'}->_close_db();
-}
-
-sub check {
- my $self = shift;
-
- return $self->{'c_transaction'}->_check();
-}
-
-sub order {
- my $self = shift;
-
- return $self->{'c_transaction'}->_order();
-}
-
-sub elements {
- my $self = shift;
- my $type = shift;
-
- $type = 0 if(!defined($type));
-
- return $self->{'c_transaction'}->_elements($type);
-}
-
-sub run {
- my $self = shift;
- my $ok_probs = shift || '';
- my $ignore_probs = shift || 0;
-
- return RPM2::C::Transaction::_run($self->{'c_transaction'}, $ok_probs,
- $ignore_probs);
-}
-
-# Preloaded methods go here.
-
-1;
-__END__
-# Below is stub documentation for your module. You better edit it!
-
-=head1 NAME
-
-RPM2 - Perl bindings for the RPM Package Manager API
-
-=head1 SYNOPSIS
-
- use RPM2;
-
- my $db = RPM2->open_rpm_db();
-
- my $i = $db->find_all_iter();
- print "The following packages are installed (aka, 'rpm -qa'):\n";
- while (my $pkg = $i->next) {
- print $pkg->as_nvre, "\n";
- }
-
- $i = $db->find_by_name_iter("kernel");
- print "The following kernels are installed (aka, 'rpm -q kernel'):\n";
- while (my $pkg = $i->next) {
- print $pkg->as_nvre, " ", int($pkg->size()/1024), "k\n";
- }
-
- $i = $db->find_by_provides_iter("kernel");
- print "The following packages provide 'kernel' (aka, 'rpm -q --whatprovides kernel'):\n";
- while (my $pkg = $i->next) {
- print $pkg->as_nvre, " ", int($pkg->size()/1024), "k\n";
- }
-
- print "The following packages are installed (aka, 'rpm -qa' once more):\n";
- foreach my $pkg ($db->find_by_file("/bin/sh")) {
- print $pkg->as_nvre, "\n";
- }
-
- my $pkg = RPM2->open_package("/tmp/XFree86-4.1.0-15.src.rpm");
- print "Package opened: ", $pkg->as_nvre(), ", is source: ", $pkg->is_source_package, "\n";
-
-=head1 DESCRIPTION
-
-The RPM2 module provides an object-oriented interface to querying both
-the installed RPM database as well as files on the filesystem.
-
-=head1 CLASS METHODS
-
-Pretty much all use of the class starts here. There are three main
-entrypoints into the package -- either through the database of
-installed rpms (aka the rpmdb), through a file on the filesystem
-(such as kernel-2.4.9-31.src.rpm or kernel-2.4.9-31.i386.rpm, or via
-an rpm transaction.
-
-You can have multiple RPM databases open at once, as well as running
-multiple queries on each. That being said if you expect to run a transaction
-to install or erase some rpms, you will need to cause any RPM2::DB and
-RPM2::PackageIterator objects to go out of scope. For instance:
-
- $db = RPM2->open_rpm_db();
- $i = $db->find_by_name("vim");
- $t = create_transaction();
- while($pkg = $i->next()) {
- $t->add_erase($pkg);
- }
- $t->run();
-
-Would end up in a dead lock waiting for $db, and $i (the RPM2::DB and
-RPM2::PackageIterator) objects to releaase their read lock on the database.
-The correct way of handling this then would be to do the following
-before running the transaction:
-
- $db = undef;
- $i = undef;
-
-That is to explicitly cause the RPM2::DB and RPM2::PackageIterator objects to
-go out of scope.
-
-=over 4
-
-=item open_rpm_db(-path => "/path/to/db")
-
-As it sounds, it opens the RPM database, and returns it as an object.
-The path to the database (i.e. C<-path>) is optional.
-
-=item open_package("foo-1.1-14.noarch.rpm")
-
-Opens a specific package (RPM or SRPM). Returns a Header object.
-
-=item create_transaction(RPM2->vsf_default)
-
-Creates an RPM2::Transaction. This can be used to install and
-remove packages. It, also, exposes the dependency ordering functionality.
-It takes as an optional argument verify signature flags. The following
-flags are available:
-
-=item RPM2->vsf_default
-
-You don't ever have to specify this, but you could if you wanted to do so.
-This will check headers, not require a files payload, and support all the
-various hash and signature formats that rpm supports.
-
-=item RPM2->vsf_nohdrchk
-
-Don't check the header.
-
-=item RPM2->vsf_needpayload
-
-Require that a files payload be part of the RPM (Chip is this right?).
-
-=item RPM2->vsf_nosha1header
-
-
-=item RPM2->vsf_nomd5header
-
-=item RPM2->vsf_nodsaheader
-
-=item RPM2->vsf_norsaheader
-
-=item RPM2->vsf_nosha1
-
-=item RPM2->vsf_nomd5
-
-=item RPM2->vsf_nodsa
-
-=item RPM2->vsf_norsa
-
-=back
-
-=head1 RPM DB object methods
-
-=over 4
-
-=item find_all_iter()
-
-Returns an iterator object that iterates over the entire database.
-
-=item find_all()
-
-Returns an list of all of the results of the find_all_iter() method.
-
-=item find_by_file_iter($filename)
-
-Returns an iterator that returns all packages that contain a given file.
-
-=item find_by_file($filename)
-
-Ditto, except it just returns the list
-
-=item find_by_name_iter($package_name)
-
-You get the idea. This one is for iterating by package name.
-
-=item find_by_name($package_name)
-
-Ditto, except it returns a list.
-
-=item find_by_provides_iter($provides_string)
-
-This one iterates over provides.
-
-=item find_by_provides($provides_string)
-
-Ditto, except it returns a list.
-
-=item find_by_requires_iter($requires_string)
-
-This one iterates over requires.
-
-=item find_by_requires($requires_string)
-
-Ditto, except it returns a list.
-
-=back
-
-=head1 RPM Database Iterator Methods
-
-Once you have a a database iterator, then you simply need to step
-through all the different package headers in the result set via the
-iterator.
-
-=over 4
-
-=item next()
-
-Return the next package header in the result set.
-
-=item expand_iter()
-
-Return the list of all the package headers in the result set of the iterator.
-
-=back
-
-=head1 RPM Header object methods
-
-In addition to the following methods, all tags have simple accessors;
-$hdr->epoch() is equivalent to $hdr->tag('epoch').
-
-The <=> and cmp operators can be used to compare versions of two packages.
-
-=over 4
-
-=item $hdr->tag($tagname)
-
-Returns the value of the tag $tagname.
-
-=item $hdr->tagformat($format)
-
-TODO.
-
-=item $hdr->is_source_package()
-
-Returns a true value if the package is a source package, false otherwise.
-
-=item $hdr->filename()
-
-Returns the filename of the package.
-
-=item $hdr->offset()
-
-Returns the rpm database offset for the package.
-
-=item $hdr->as_nvre()
-
-Returns a string formatted like:
-
- epoch:name-version-release
-
-If epoch is undefined for this package, it and the leading colon are omitted.
-
-=item $hdr->files()
-
-TODO.
-
-=item $hdr->raw_header()
-
-Return the binary representation of the header (ie, the rpm file
-itself without the actual content of the files in the cpio archive).
-
-=item $hdr->changelog()
-
-Returns a list of hash refs containing the change log data of the package.
-The hash keys represent individual change log entries, and their keys are:
-C<time> (the time of the changelog entry), C<name> (the "name", ie. often
-the email address of the author of the entry), and C<text> (the text of the
-entry).
-
-=back
-
-=head1 Transaction object methods
-
-Transactions are what allow you to install, upgrade, and remove rpms.
-Transactions are created, have elements added to them (i.e. package headers)
-and are ran. When run the updates to the system and the rpm database are
-treated as on "transaction" which is assigned a transaction id. This can
-be queried in install packages as the INSTALLTID, and for repackaged packages
-they have the REMOVETID set.
-
-=over 4
-
-=item add_install($pkg, $upgrade)
-
-Adds a package to a transaction for installation. If you want this to
-be done as a package upgrade, then be sure to set the second optional
-parameter to 1. It will return 0 on failure and 1 on success. Note,
-this should be obvious, but the package header must come from an rpm file,
-not from the RPM database.
-
-=item add_erase($pkg)
-
-Adds a package to a transaction for erasure. The package header should
-come from the database (i.e. via an iterator) and not an rpm file.
-
-=item element_count()
-
-Returns the number of elements in a transaction (this is the sum of the
-install and erase elements.
-
-=item close_db()
-
-Closes the rpm database. This is needed for some ordering of
-transactions for non-install purposes.
-
-=item check()
-
-Verify that the dependencies for this transaction are met. Returns
-0 on failure and 1 on success.
-
-=item order()
-
-Order the elements in dependency order.
-
-=item elements()
-
-Return a list of elements as they are presently ordered. Note, this
-returns the NEVR's not the package headers.
-
-=item run()
-
-Run the transaction. This will automatically check for dependency
-satisfaction, and order the transaction.
-
-=back
-
-=head1 TODO
-
-Make package installation and removal better (-;.
-
-Signature validation.
-
-=head1 HISTORY
-
-=over 8
-
-=item 0.01
-Initial release
-
-=back
-
-
-=head1 AUTHOR
-
-Chip Turner E<lt>cturner@redhat.comE<gt>
-
-=head1 SEE ALSO
-
-L<perl>.
-The original L<RPM> module.
-
-=cut
+++ /dev/null
-#include <stdio.h>
-#include "rpmlib.h"
-#include "rpmcli.h"
-
-#ifdef RPM2_RPM41
-#include "rpmts.h"
-#include "rpmte.h"
-#endif
-
-#include "header.h"
-#include "rpmdb.h"
-#include "misc.h"
-
-#include "EXTERN.h"
-#include "perl.h"
-#include "XSUB.h"
-
-#if !defined(RPM2_RPM41) && !defined(RPM2_RPM40)
-#error Must define one of RPM2_RPM41 or RPM2_RPM40; perhaps Makefile.PL could not guess your RPM API version?
-#endif
-
-/* Chip, this is somewhat stripped down from the default callback used by
- the rpmcli. It has to be here to insure that we open the pkg again.
- If we don't do this we get segfaults. I also, kept the updating of some
- of the rpmcli static vars, but I may not have needed to do this.
-
- Also, we probably want to give a nice interface such that we could allow
- users of RPM2 to do their own callback, but that will have to come later.
-*/
-void * _null_callback(
- const void * arg,
- const rpmCallbackType what,
- const unsigned long amount,
- const unsigned long total,
- fnpyKey key,
- rpmCallbackData data)
-{
- Header h = (Header) arg;
- char * s;
- int flags = (int) ((long)data);
- void * rc = NULL;
- const char * filename = (const char *)key;
- static FD_t fd = NULL;
- int xx;
-
- /* Code stolen from rpminstall.c and modified */
- switch(what) {
- case RPMCALLBACK_INST_OPEN_FILE:
- if (filename == NULL || filename[0] == '\0')
- return NULL;
- fd = Fopen(filename, "r.ufdio");
- /* FIX: still necessary? */
- if (fd == NULL || Ferror(fd)) {
- fprintf(stderr, "open of %s failed!\n", filename);
- if (fd != NULL) {
- xx = Fclose(fd);
- fd = NULL;
- }
- } else
- fd = fdLink(fd, "persist (showProgress)");
- return (void *)fd;
- break;
-
- case RPMCALLBACK_INST_CLOSE_FILE:
- /* FIX: still necessary? */
- fd = fdFree(fd, "persist (showProgress)");
- if (fd != NULL) {
- xx = Fclose(fd);
- fd = NULL;
- }
- break;
-
-#ifdef RPM2_RPM41
- case RPMCALLBACK_INST_START:
- rpmcliHashesCurrent = 0;
- if (h == NULL || !(flags & INSTALL_LABEL))
- break;
- break;
- case RPMCALLBACK_TRANS_PROGRESS:
- case RPMCALLBACK_INST_PROGRESS:
- break;
-
- case RPMCALLBACK_TRANS_START:
- rpmcliHashesCurrent = 0;
- rpmcliProgressTotal = 1;
- rpmcliProgressCurrent = 0;
- break;
-
- case RPMCALLBACK_TRANS_STOP:
- rpmcliProgressTotal = rpmcliPackagesTotal;
- rpmcliProgressCurrent = 0;
- break;
-
- case RPMCALLBACK_REPACKAGE_START:
- rpmcliHashesCurrent = 0;
- rpmcliProgressTotal = total;
- rpmcliProgressCurrent = 0;
- break;
-
- case RPMCALLBACK_REPACKAGE_PROGRESS:
- break;
-
- case RPMCALLBACK_REPACKAGE_STOP:
- rpmcliProgressTotal = total;
- rpmcliProgressCurrent = total;
- rpmcliProgressTotal = rpmcliPackagesTotal;
- rpmcliProgressCurrent = 0;
- break;
-
- case RPMCALLBACK_UNINST_PROGRESS:
- break;
- case RPMCALLBACK_UNINST_START:
- break;
- case RPMCALLBACK_UNINST_STOP:
- break;
- case RPMCALLBACK_UNPACK_ERROR:
- break;
- case RPMCALLBACK_CPIO_ERROR:
- break;
- case RPMCALLBACK_UNKNOWN:
- break;
-#endif
- default:
- break;
- }
-
- return rc;
-}
-
-void
-_populate_header_tags(HV *href)
-{
- int i = 0;
-
- for (i = 0; i < rpmTagTableSize; i++) {
- hv_store(href, rpmTagTable[i].name, strlen(rpmTagTable[i].name), newSViv(rpmTagTable[i].val), 0);
- }
-}
-
-void
-_populate_constant(HV *href, char *name, int val)
-{
- hv_store(href, name, strlen(name), newSViv(val), 0);
-}
-
-#define REGISTER_CONSTANT(name) _populate_constant(constants, #name, name)
-
-MODULE = RPM2 PACKAGE = RPM2
-
-PROTOTYPES: ENABLE
-BOOT:
- {
- HV *header_tags, *constants;
- rpmReadConfigFiles(NULL, NULL);
-
- header_tags = perl_get_hv("RPM2::header_tag_map", TRUE);
- _populate_header_tags(header_tags);
-
- constants = perl_get_hv("RPM2::constants", TRUE);
-
- /* not the 'standard' way of doing perl constants, but a lot easier to maintain */
-#ifdef RPM2_RPM41
- REGISTER_CONSTANT(RPMVSF_DEFAULT);
- REGISTER_CONSTANT(RPMVSF_NOHDRCHK);
- REGISTER_CONSTANT(RPMVSF_NEEDPAYLOAD);
- REGISTER_CONSTANT(RPMVSF_NOSHA1HEADER);
- REGISTER_CONSTANT(RPMVSF_NOMD5HEADER);
- REGISTER_CONSTANT(RPMVSF_NODSAHEADER);
- REGISTER_CONSTANT(RPMVSF_NORSAHEADER);
- REGISTER_CONSTANT(RPMVSF_NOSHA1);
- REGISTER_CONSTANT(RPMVSF_NOMD5);
- REGISTER_CONSTANT(RPMVSF_NODSA);
- REGISTER_CONSTANT(RPMVSF_NORSA);
- REGISTER_CONSTANT(_RPMVSF_NODIGESTS);
- REGISTER_CONSTANT(_RPMVSF_NOSIGNATURES);
- REGISTER_CONSTANT(_RPMVSF_NOHEADER);
- REGISTER_CONSTANT(_RPMVSF_NOPAYLOAD);
- REGISTER_CONSTANT(TR_ADDED);
- REGISTER_CONSTANT(TR_REMOVED);
- REGISTER_CONSTANT(RPMSENSE_PATCHES);
- REGISTER_CONSTANT(RPMSENSE_CONFIG);
-#endif
-
- REGISTER_CONSTANT(RPMSENSE_ANY);
- REGISTER_CONSTANT(RPMSENSE_SERIAL);
- REGISTER_CONSTANT(RPMSENSE_LESS);
- REGISTER_CONSTANT(RPMSENSE_GREATER);
- REGISTER_CONSTANT(RPMSENSE_EQUAL);
- REGISTER_CONSTANT(RPMSENSE_PROVIDES);
- REGISTER_CONSTANT(RPMSENSE_CONFLICTS);
- REGISTER_CONSTANT(RPMSENSE_PREREQ);
- REGISTER_CONSTANT(RPMSENSE_OBSOLETES);
- REGISTER_CONSTANT(RPMSENSE_INTERP);
- REGISTER_CONSTANT(RPMSENSE_SCRIPT_PRE);
- REGISTER_CONSTANT(RPMSENSE_SCRIPT_POST);
- REGISTER_CONSTANT(RPMSENSE_SCRIPT_PREUN);
- REGISTER_CONSTANT(RPMSENSE_SCRIPT_POSTUN);
- REGISTER_CONSTANT(RPMSENSE_SCRIPT_VERIFY);
- REGISTER_CONSTANT(RPMSENSE_FIND_REQUIRES);
- REGISTER_CONSTANT(RPMSENSE_FIND_PROVIDES);
- REGISTER_CONSTANT(RPMSENSE_TRIGGERIN);
- REGISTER_CONSTANT(RPMSENSE_TRIGGERUN);
- REGISTER_CONSTANT(RPMSENSE_TRIGGERPOSTUN);
- REGISTER_CONSTANT(RPMSENSE_SCRIPT_PREP);
- REGISTER_CONSTANT(RPMSENSE_SCRIPT_BUILD);
- REGISTER_CONSTANT(RPMSENSE_SCRIPT_INSTALL);
- REGISTER_CONSTANT(RPMSENSE_SCRIPT_CLEAN);
- REGISTER_CONSTANT(RPMSENSE_RPMLIB);
- REGISTER_CONSTANT(RPMSENSE_TRIGGERPREIN);
- REGISTER_CONSTANT(RPMSENSE_KEYRING);
-
- }
-
-double
-rpm_api_version(pkg)
- char * pkg
- CODE:
-#if defined(RPM2_RPM41) && ! defined(RPM2_RPM40)
- RETVAL = (double)4.1;
-#endif
-#if ! defined(RPM2_RPM41) && defined(RPM2_RPM40)
- RETVAL = (double)4.0;
-#endif
- OUTPUT:
- RETVAL
-
-
-void
-add_macro(pkg, name, val)
- char * pkg
- char * name
- char * val
- CODE:
- addMacro(NULL, name, NULL, val, RMIL_DEFAULT);
-
-void
-delete_macro(pkg, name)
- char * pkg
- char * name
- CODE:
- delMacro(NULL, name);
-
-void
-expand_macro(pkg, str)
- char * pkg
- char * str
- PREINIT:
- char *ret;
- PPCODE:
- ret = rpmExpand(str, NULL);
- PUSHs(sv_2mortal(newSVpv(ret, 0)));
- free(ret);
-
-int
-rpmvercmp(one, two)
- char* one
- char* two
-
-void
-_read_package_info(fp, vsflags)
- FILE *fp
- int vsflags
- PREINIT:
-#ifdef RPM2_RPM41
- rpmts ts;
-#endif
- Header ret;
- Header sigs;
- rpmRC rc;
- FD_t fd;
- PPCODE:
-#ifdef RPM2_RPM41
- ts = rpmtsCreate();
-#endif
-
- /* XXX Determine type of signature verification when reading
- vsflags |= _RPMTS_VSF_NOLEGACY;
- vsflags |= _RPMTS_VSF_NODIGESTS;
- vsflags |= _RPMTS_VSF_NOSIGNATURES;
- xx = rpmtsSetVerifySigFlags(ts, vsflags);
- */
-
- fd = fdDup(fileno(fp));
-#ifdef RPM2_RPM41
- rpmtsSetVSFlags(ts, vsflags);
- rc = rpmReadPackageFile(ts, fd, "filename or other identifier", &ret);
-#else
- rc = rpmReadPackageInfo(fd, NULL, &ret);
-#endif
-
- Fclose(fd);
-
- if (rc == RPMRC_OK) {
- SV *h_sv;
-
- EXTEND(SP, 1);
-
- h_sv = sv_newmortal();
- sv_setref_pv(h_sv, "RPM2::C::Header", (void *)ret);
-
- PUSHs(h_sv);
- }
- else {
- croak("error reading package (%d)", rc);
- }
-#ifdef RPM2_RPM41
- ts = rpmtsFree(ts);
-#endif
-
-#ifdef RPM2_RPM41
-
-void
-_create_transaction(vsflags)
- int vsflags
- PREINIT:
- rpmts ret;
- SV *h_sv;
- PPCODE:
- /* Looking at librpm, it does not look like this ever
- returns error (though maybe it should).
- */
- ret = rpmtsCreate();
-
- /* Should I save the old vsflags aside? */
- rpmtsSetVSFlags(ret, vsflags);
-
- /* Convert and throw the results on the stack */
- EXTEND(SP, 1);
-
- h_sv = sv_newmortal();
- sv_setref_pv(h_sv, "RPM2::C::Transaction", (void *)ret);
-
- PUSHs(h_sv);
-
-#endif
-
-void
-_read_from_file(fp)
- FILE *fp
-PREINIT:
- SV *h_sv;
- FD_t fd;
- Header h;
-PPCODE:
- fd = fdDup(fileno(fp));
- h = headerRead(fd, HEADER_MAGIC_YES);
-
- if (h) {
- EXTEND(SP, 1);
-
- h_sv = sv_newmortal();
- sv_setref_pv(h_sv, "RPM2::C::Header", (void *)h);
-
- PUSHs(h_sv);
- }
- Fclose(fd);
-
-
-rpmdb
-_open_rpm_db(for_write)
- int for_write
- PREINIT:
- rpmdb db;
- CODE:
- if (rpmdbOpen(NULL, &db, for_write ? O_RDWR | O_CREAT : O_RDONLY, 0644)) {
- croak("rpmdbOpen failed");
- RETVAL = NULL;
- }
- RETVAL = db;
- OUTPUT:
- RETVAL
-
-MODULE = RPM2 PACKAGE = RPM2::C::DB
-
-void
-DESTROY(db)
- rpmdb db
- CODE:
- rpmdbClose(db);
-
-void
-_close_rpm_db(self)
- rpmdb self
- CODE:
- rpmdbClose(self);
-
-rpmdbMatchIterator
-_init_iterator(db, rpmtag, key, len)
- rpmdb db
- int rpmtag
- char *key
- size_t len
- CODE:
- RETVAL = rpmdbInitIterator(db, rpmtag, key && *key ? key : NULL, len);
- OUTPUT:
- RETVAL
-
-MODULE = RPM2 PACKAGE = RPM2::C::PackageIterator
-Header
-_iterator_next(i)
- rpmdbMatchIterator i
- PREINIT:
- Header ret;
- SV * h_sv;
- unsigned int offset;
- PPCODE:
- ret = rpmdbNextIterator(i);
- if (ret)
- headerLink(ret);
- if(ret != NULL)
- offset = rpmdbGetIteratorOffset(i);
- else
- offset = 0;
-
- EXTEND(SP, 2);
- h_sv = sv_newmortal();
- sv_setref_pv(h_sv, "RPM2::C::Header", (void *)ret);
- PUSHs(h_sv);
- PUSHs(sv_2mortal(newSViv(offset)));
-
-void
-DESTROY(i)
- rpmdbMatchIterator i
- CODE:
- rpmdbFreeIterator(i);
-
-
-MODULE = RPM2 PACKAGE = RPM2::C::Header
-
-void
-DESTROY(h)
- Header h
- CODE:
- headerFree(h);
-
-void
-tag_by_id(h, tag)
- Header h
- int tag
- PREINIT:
- void *ret = NULL;
- int type;
- int n;
- int ok;
- PPCODE:
- ok = headerGetEntry(h, tag, &type, &ret, &n);
-
- if (!ok) {
- /* nop, empty stack */
- }
- else {
- switch(type)
- {
- case RPM_STRING_ARRAY_TYPE:
- {
- int i;
- char **s;
-
- EXTEND(SP, n);
- s = (char **)ret;
-
- for (i = 0; i < n; i++) {
- PUSHs(sv_2mortal(newSVpv(s[i], 0)));
- }
- }
- break;
- case RPM_STRING_TYPE:
- PUSHs(sv_2mortal(newSVpv((char *)ret, 0)));
- break;
- case RPM_CHAR_TYPE:
- case RPM_INT8_TYPE:
- case RPM_INT16_TYPE:
- case RPM_INT32_TYPE:
- {
- int i;
- int *r;
-
- EXTEND(SP, n);
- r = (int *)ret;
-
- for (i = 0; i < n; i++) {
- PUSHs(sv_2mortal(newSViv(r[i])));
- }
- }
- break;
- default:
- croak("unknown rpm tag type %d", type);
- }
- }
- headerFreeData(ret, type);
-
-int
-_header_compare(h1, h2)
- Header h1
- Header h2
- CODE:
- RETVAL = rpmVersionCompare(h1, h2);
- OUTPUT:
- RETVAL
-
-int
-_header_is_source(h)
- Header h
- CODE:
- RETVAL = headerIsEntry(h, RPMTAG_SOURCEPACKAGE);
- OUTPUT:
- RETVAL
-
-void
-_header_sprintf(h, format)
- Header h
- char * format
- PREINIT:
- char * s;
- PPCODE:
- s = headerSprintf(h, format, rpmTagTable, rpmHeaderFormats, NULL);
- PUSHs(sv_2mortal(newSVpv((char *)s, 0)));
- s = _free(s);
-
-void
-_unload(h)
- Header h
- PREINIT:
- char *buf;
- unsigned int size;
- PPCODE:
- size = headerSizeof(h, 0);
- buf = headerUnload(h);
- PUSHs(sv_2mortal(newSVpv(buf, size)));
-
-MODULE = RPM2 PACKAGE = RPM2::C::Transaction
-
-#ifdef RPM2_RPM41
-void
-DESTROY(t)
- rpmts t
- CODE:
- t = rpmtsFree(t);
-
-# XXX: Add relocations some day.
-int
-_add_install(t, h, fn, upgrade)
- rpmts t
- Header h
- char * fn
- int upgrade
- PREINIT:
- rpmRC rc = 0;
- CODE:
- rc = rpmtsAddInstallElement(t, h, (fnpyKey) fn, upgrade, NULL);
- RETVAL = (rc == RPMRC_OK) ? 1 : 0;
- OUTPUT:
- RETVAL
-
-int
-_add_delete(t, h, offset)
- rpmts t
- Header h
- unsigned int offset
- PREINIT:
- rpmRC rc = 0;
- CODE:
- rc = rpmtsAddEraseElement(t, h, offset);
- RETVAL = (rc == RPMRC_OK) ? 1 : 0;
- OUTPUT:
- RETVAL
-
-int
-_element_count(t)
- rpmts t
-PREINIT:
- int ret;
-CODE:
- ret = rpmtsNElements(t);
- RETVAL = ret;
-OUTPUT:
- RETVAL
-
-int
-_close_db(t)
- rpmts t
-PREINIT:
- int ret;
-CODE:
- ret = rpmtsCloseDB(t);
- RETVAL = (ret == 0) ? 1 : 0;
-OUTPUT:
- RETVAL
-
-int
-_check(t)
- rpmts t
-PREINIT:
- int ret;
-CODE:
- ret = rpmtsCheck(t);
- RETVAL = (ret == 0) ? 1 : 0;
-OUTPUT:
- RETVAL
-
-int
-_order(t)
- rpmts t
-PREINIT:
- int ret;
-CODE:
- ret = rpmtsOrder(t);
- /* XXX: May want to do something different here. It actually
- returns the number of non-ordered elements...maybe we
- want this?
- */
- RETVAL = (ret == 0) ? 1 : 0;
-OUTPUT:
- RETVAL
-
-void
-_elements(t, type)
- rpmts t;
- rpmElementType type;
-PREINIT:
- rpmtsi i;
- rpmte te;
- const char * NEVR;
-PPCODE:
- i = rpmtsiInit(t);
- if(i == NULL) {
- printf("Did not get a thing!\n");
- return;
- } else {
- while((te = rpmtsiNext(i, type)) != NULL) {
- NEVR = rpmteNEVR(te);
- XPUSHs(sv_2mortal(newSVpv(NEVR, 0)));
- }
- i = rpmtsiFree(i);
- }
-
-int
-_run(t, ok_probs, prob_filter)
- rpmts t
- rpmprobFilterFlags prob_filter
- PREINIT:
- int i;
- rpmProblem p;
- int ret;
- CODE:
- /* Make sure we could run this transactions */
- ret = rpmtsCheck(t);
- if (ret != 0) {
- RETVAL = 0;
- return;
- }
- ret = rpmtsOrder(t);
- if (ret != 0) {
- RETVAL = 0;
- return;
- }
-
- /* XXX: Should support callbacks eventually */
- (void) rpmtsSetNotifyCallback(t, _null_callback, (void *) ((long)0));
- ret = rpmtsRun(t, NULL, prob_filter);
- RETVAL = (ret == 0) ? 1 : 0;
- OUTPUT:
- RETVAL
-
-#endif
-
-
+++ /dev/null
-Summary: test rpm for perl-RPM2 test suite
-BuildArch: noarch
-Name: test-rpm
-Version: 1.0
-Release: 1
-Source0: test-rpm.spec
-License: GPL
-Group: Application/Development
-BuildRoot: %{_tmppath}/%{name}-root
-
-%description
-test rpm
-%prep
-
-%build
-
-%install
-rm -rf $RPM_BUILD_ROOT
-mkdir -p $RPM_BUILD_ROOT/tmp
-cp %{SOURCE0} $RPM_BUILD_ROOT/tmp
-
-%clean
-rm -rf $RPM_BUILD_ROOT
-
-%files
-%defattr(-,root,root)
-/tmp/test-rpm.spec
-
-%changelog
-* Sat Apr 13 2002 Chip Turner <cturner@localhost.localdomain>
-- Initial build.
-
-
+++ /dev/null
-#!/usr/bin/perl -w
-use strict;
-
-# Before `make install' is performed this script should be runnable with
-# `make test'. After `make install' it should work as `perl test.pl'
-
-#########################
-
-# change 'tests => 1' to 'tests => last_test_to_print';
-# comment to test checkin
-
-use Test;
-use strict;
-BEGIN { plan tests => 64 };
-use RPM2;
-ok(1); # If we made it this far, we're ok.
-
-#########################
-
-# Insert your test code below, the Test module is use()ed here so read
-# its man page ( perldoc Test ) for help writing this test script.
-
-ok(RPM2::rpmvercmp("1.0", "1.1") == -1);
-ok(RPM2::rpmvercmp("1.1", "1.0") == 1);
-ok(RPM2::rpmvercmp("1.0", "1.0") == 0);
-
-# UPDATE: the vercmp bug was finally fixed, and broke this test, heh
-# this is a bug case in rpmvervmp; good one for testing
-# ok(RPM2::rpmvercmp("1.a", "1.0") == RPM2::rpmvercmp("1.0", "1.a"));
-
-my $db = RPM2->open_rpm_db();
-ok(defined $db);
-
-my @pkg;
-my $i = $db->find_all_iter();
-
-ok($i);
-while (my $pkg = $i->next) {
- push @pkg, $pkg;
-}
-
-ok(@pkg);
-ok($pkg[0]->name);
-
-@pkg = ();
-$i = $db->find_by_name_iter("kernel");
-ok($i);
-while (my $pkg = $i->next) {
- push @pkg, $pkg;
-}
-if (@pkg) {
- ok($pkg[0]->name);
-}
-
-@pkg = ();
-
-$i = $db->find_by_provides_iter("kernel");
-ok($i);
-while (my $pkg = $i->next) {
- push @pkg, $pkg;
-}
-if (@pkg) {
- ok($pkg[0]->name);
-}
-
-@pkg = ();
-foreach my $pkg ($db->find_by_file("/bin/sh")) {
- push @pkg, $pkg;
-}
-if (@pkg) {
- ok($pkg[0]->name);
-}
-
-@pkg = ();
-foreach my $pkg ($db->find_by_requires("/bin/bash")) {
- push @pkg, $pkg;
-}
-if (@pkg) {
- ok($pkg[0]->name);
- ok(not defined $pkg[0]->filename);
-}
-
-my $pkg = RPM2->open_package("test-rpm-1.0-1.noarch.rpm");
-ok($pkg);
-ok($pkg->name eq 'test-rpm');
-ok($pkg->tagformat("--%{NAME}%{VERSION}--") eq '--test-rpm1.0--');
-ok($pkg->tagformat("--%{NAME}%{VERSION}--") ne 'NOT A MATCH');
-ok(!$pkg->is_source_package);
-
-my @cl = $pkg->changelog();
-ok(scalar(@cl) == 1);
-ok($cl[0]->{time} == 1018735200); # Sun Apr 14 2002
-ok($cl[0]->{name} eq 'Chip Turner <cturner@localhost.localdomain>');
-ok($cl[0]->{text} eq '- Initial build.');
-
-
-$pkg = RPM2->open_package("test-rpm-1.0-1.src.rpm");
-ok($pkg);
-ok($pkg->name eq 'test-rpm');
-ok($pkg->tagformat("--%{NAME}--") eq '--test-rpm--');
-ok($pkg->is_source_package);
-
-my $pkg2 = RPM2->open_package("test-rpm-1.0-1.noarch.rpm");
-ok($pkg2->filename);
-ok($pkg->compare($pkg2) == 0);
-ok(($pkg <=> $pkg2) == 0);
-ok(!($pkg < $pkg2));
-ok(!($pkg > $pkg2));
-
-# another rpm, handily provided by the rpmdb-redhat package
-my $other_rpm_dir = "/usr/lib/rpmdb/i386-redhat-linux/redhat";
-if (-d $other_rpm_dir) {
- my $db2 = RPM2->open_rpm_db(-path => $other_rpm_dir);
- ok(defined $db2);
- $db2 = undef;
-}
-else {
- print "Install the rpmdb-redhat package to test two simultaneous open databases\n";
- ok(1);
-}
-
-ok(RPM2->expand_macro("%%foo") eq "%foo");
-RPM2->add_macro("rpm2_test_macro", "testval $$");
-ok(RPM2->expand_macro("%rpm2_test_macro") eq "testval $$");
-RPM2->delete_macro("rpm2_test_macro");
-ok(RPM2->expand_macro("%rpm2_test_macro") eq "%rpm2_test_macro");
-
-ok(RPM2->rpm_api_version == 4.1 or RPM2->rpm_api_version == 4.0);
-ok(RPM2->rpm_api_version == 4.0 or RPM2->vsf_nosha1 == 65536);
-
-#
-# Clean up before transaction tests (close the database
-$db = undef;
-$i = undef;
-
-if (RPM2->rpm_api_version > 4.0) {
- #
- # Transaction tests.
- my $t = RPM2->create_transaction();
- ok(ref($t) eq 'RPM2::Transaction');
- ok(ref($t) eq 'RPM2::Transaction');
- $pkg = RPM2->open_package("test-rpm-1.0-1.noarch.rpm");
- # Make sure we still can open packages.
- ok($pkg);
- # Add package to transaction
- ok($t->add_install($pkg));
- # Check element count
- ok($t->element_count() == 1);
- # Test depedency checks
- ok($t->check());
- # Order the transaction...see if we get our one transaction.
- ok($t->order());
- my @rpms = $t->elements();
- ok($rpms[0] eq $pkg->as_nvre());
- ok(scalar(@rpms) == 1);
- # Install package
- ok($t->run());
- $t = undef;
-
- #
- # See if we can find the rpm in the database now...
- $db = RPM2->open_rpm_db();
- ok(defined $db);
- @pkg = ();
- $i = $db->find_by_name_iter("test-rpm");
- ok($i);
- while (my $pkg = $i->next) {
- push @pkg, $pkg;
- }
- ok(scalar(@pkg) == 1);
- $i = undef;
- $db = undef;
-
- #
- # OK, lets remove that rpm with a new transaction
- $t = RPM2->create_transaction();
- ok(ref($t) eq 'RPM2::Transaction');
- # We need to find the package we installed, and try to erase it
- ok($t->add_erase($pkg[0]));
- # Check element count
- ok($t->element_count() == 1);
- # Test depedency checks
- ok($t->check());
- # Order the transaction...see if we get our one transaction.
- ok($t->order());
- #my @rpms = $t->elements();
- ok($rpms[0] eq $pkg->as_nvre());
- ok(scalar(@rpms) == 1);
- # Install package
- ok($t->run());
- # Test closing the database
- ok($t->close_db());
-}
-else {
- # transactions are rpm 4.1 and newer, so we skip them here.
- ok(1) for 1 .. 22;
-}
-
-my @headers = RPM2->open_hdlist("hdlist-test.hdr");
-ok(scalar @headers, 3, 'found three headers in hdlist-test.hdr');
-ok(grep { $_->tag('name') eq 'mod_perl' } @headers);
-
-# ensure the raw header from hdlist-test.hdr's first entry is correct
-my $binary_header = $headers[0]->raw_header;
-ok(length($binary_header) == 6560);
+++ /dev/null
-TYPEMAP
-rpmdb O_OBJECT_rpmdb
-rpmdbMatchIterator O_OBJECT_rpmmi
-Header O_OBJECT_header
-rpmts O_OBJECT_rpmts
-rpmprobFilterFlags T_IV
-rpmElementType T_IV
-
-INPUT
-O_OBJECT_rpmdb
- if (sv_isobject($arg) && (SvTYPE(SvRV($arg)) == SVt_PVMG))
- $var = ($type)SvIV((SV*)SvRV( $arg ));
- else {
- warn( \"${Package}::$func_name() -- $var is not a blessed SV reference\" );
- XSRETURN_UNDEF;
- }
-
-O_OBJECT_rpmmi
- if (sv_isobject($arg) && (SvTYPE(SvRV($arg)) == SVt_PVMG))
- $var = ($type)SvIV((SV*)SvRV( $arg ));
- else {
- warn( \"${Package}::$func_name() -- $var is not a blessed SV reference\" );
- XSRETURN_UNDEF;
- }
-
-O_OBJECT_header
- if (sv_isobject($arg) && (SvTYPE(SvRV($arg)) == SVt_PVMG))
- $var = ($type)SvIV((SV*)SvRV( $arg ));
- else {
- warn( \"${Package}::$func_name() -- $var is not a blessed SV reference\" );
- XSRETURN_UNDEF;
- }
-
-O_OBJECT_rpmts
- if (sv_isobject($arg) && (SvTYPE(SvRV($arg)) == SVt_PVMG))
- $var = ($type)SvIV((SV*)SvRV( $arg ));
- else {
- warn( \"${Package}::$func_name() -- $var is not a blessed SV reference\" );
- XSRETURN_UNDEF;
- }
-
-OUTPUT
-O_OBJECT_rpmdb
- sv_setref_pv( $arg, "RPM2::C::DB", (void*)$var );
-O_OBJECT_rpmmi
- sv_setref_pv( $arg, "RPM2::C::PackageIterator", (void*)$var );
-O_OBJECT_header
- sv_setref_pv( $arg, "RPM2::C::Header", (void*)$var );
-O_OBJECT_rpmts
- sv_setref_pv( $arg, "RPM2::C::Transaction", (void*)$var );
+++ /dev/null
-rpm.bs
-rpm.c
-pm_to_blib
-Makefile
-blib
-perl
projects / platform / upstream / rpm.git / commitdiff