2 * Copyright (C) 2007 Denys Vlasenko <vda.linux@googlemail.com>
4 * This file uses bzip2 library code which is written
5 * by Julian Seward <jseward@bzip.org>.
6 * See README and LICENSE files in bz/ directory for more information
7 * about bzip2 library code.
10 //applet:IF_BZIP2(APPLET(bzip2, BB_DIR_USR_BIN, BB_SUID_DROP))
11 //kbuild:lib-$(CONFIG_BZIP2) += bzip2.o
13 //usage:#define bzip2_trivial_usage
14 //usage: "[OPTIONS] [FILE]..."
15 //usage:#define bzip2_full_usage "\n\n"
16 //usage: "Compress FILEs (or stdin) with bzip2 algorithm\n"
17 //usage: "\n -1..9 Compression level"
18 //usage: "\n -d Decompress"
19 //usage: "\n -c Write to stdout"
20 //usage: "\n -f Force"
23 #include "bb_archive.h"
25 #define CONFIG_BZIP2_FAST 1
28 * Compiled with gcc 4.2.1, run on Athlon 64 1800 MHz (512K L2 cache).
29 * Stock bzip2 is 26.4% slower than bbox bzip2 at SPEED 1
30 * (time to compress gcc-4.2.1.tar is 126.4% compared to bbox).
31 * At SPEED 5 difference is 32.7%.
33 * Test run of all CONFIG_BZIP2_FAST values on a 11Mb text file:
35 * 0: 10828 4.145 4.146 4.148
36 * 1: 11097 3.845 3.860 3.861
37 * 2: 11392 3.763 3.767 3.768
38 * 3: 11892 3.722 3.724 3.727
39 * 4: 12740 3.637 3.640 3.644
40 * 5: 17273 3.497 3.509 3.509
45 /* Takes ~300 bytes, detects corruption caused by bad RAM etc */
46 #define BZ_LIGHT_DEBUG 0
48 #include "libarchive/bz/bzlib.h"
50 #include "libarchive/bz/bzlib_private.h"
52 #include "libarchive/bz/blocksort.c"
53 #include "libarchive/bz/bzlib.c"
54 #include "libarchive/bz/compress.c"
55 #include "libarchive/bz/huffman.c"
57 /* No point in being shy and having very small buffer here.
58 * bzip2 internal buffers are much bigger anyway, hundreds of kbytes.
59 * If iobuf is several pages long, malloc() may use mmap,
60 * making iobuf is page aligned and thus (maybe) have one memcpy less
61 * if kernel is clever enough.
69 /* NB: compressStream() has to return -1 on errors, not die.
70 * bbunpack() will correctly clean up in this case
71 * (delete incomplete .bz2 file)
76 * total written bytes so far otherwise
79 IF_DESKTOP(long long) int bz_write(bz_stream *strm, void* rbuf, ssize_t rlen, void *wbuf)
83 strm->avail_in = rlen;
86 strm->avail_out = IOBUF_SIZE;
87 strm->next_out = wbuf;
89 ret = BZ2_bzCompress(strm, rlen ? BZ_RUN : BZ_FINISH);
90 if (ret != BZ_RUN_OK /* BZ_RUNning */
91 && ret != BZ_FINISH_OK /* BZ_FINISHing, but not done yet */
92 && ret != BZ_STREAM_END /* BZ_FINISHed */
94 bb_error_msg_and_die("internal error %d", ret);
97 n = IOBUF_SIZE - strm->avail_out;
99 n2 = full_write(STDOUT_FILENO, wbuf, n);
102 errno = 0; /* prevent bogus error message */
103 bb_perror_msg(n2 >= 0 ? "short write" : bb_msg_write_error);
108 if (ret == BZ_STREAM_END)
110 if (rlen && strm->avail_in == 0)
113 return 0 IF_DESKTOP( + strm->total_out );
117 IF_DESKTOP(long long) int FAST_FUNC compressStream(transformer_aux_data_t *aux UNUSED_PARAM)
119 IF_DESKTOP(long long) int total;
121 bz_stream bzs; /* it's small */
125 #define wbuf (iobuf + IOBUF_SIZE)
127 iobuf = xmalloc(2 * IOBUF_SIZE);
128 BZ2_bzCompressInit(strm, level);
131 count = full_read(STDIN_FILENO, rbuf, IOBUF_SIZE);
133 bb_perror_msg(bb_msg_read_error);
137 /* if count == 0, bz_write finalizes compression */
138 total = bz_write(strm, rbuf, count, wbuf);
139 if (count == 0 || total < 0)
143 /* Can't be conditional on ENABLE_FEATURE_CLEAN_UP -
144 * we are called repeatedly
146 BZ2_bzCompressEnd(strm);
152 int bzip2_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
153 int bzip2_main(int argc UNUSED_PARAM, char **argv)
157 /* standard bzip2 flags
158 * -d --decompress force decompression
159 * -z --compress force compression
160 * -k --keep keep (don't delete) input files
161 * -f --force overwrite existing output files
162 * -t --test test compressed file integrity
163 * -c --stdout output to standard out
164 * -q --quiet suppress noncritical error messages
165 * -v --verbose be verbose (a 2nd -v gives more)
166 * -s --small use less memory (at most 2500k)
167 * -1 .. -9 set block size to 100k .. 900k
168 * --fast alias for -1
169 * --best alias for -9
172 opt_complementary = "s2"; /* -s means -2 (compatibility) */
173 /* Must match bbunzip's constants OPT_STDOUT, OPT_FORCE! */
174 opt = getopt32(argv, "cfv" IF_BUNZIP2("dt") "123456789qzs");
175 #if ENABLE_BUNZIP2 /* bunzip2_main may not be visible... */
176 if (opt & 0x18) // -d and/or -t
177 return bunzip2_main(argc, argv);
182 opt = (uint8_t)opt; /* isolate bits for -1..-8 */
183 opt |= 0x100; /* if nothing else, assume -9 */
191 option_mask32 &= 0x7; /* ignore all except -cfv */
192 return bbunpack(argv, compressStream, append_ext, "bz2");