* Fiala,E.R., and Greene,D.H.
* Data Compression with Finite Windows, Comm.ACM, 32,4 (1989) 490-595
*
+ * - add https://svn.uhulinux.hu/packages/dev/zlib/patches/02-rsync.patch
*/
/* @(#) $Id$ */
#include "deflate.h"
const char deflate_copyright[] =
- " deflate 1.2.2 Copyright 1995-2004 Jean-loup Gailly ";
+ " deflate 1.2.2.f-rpm-rsync Copyright 1995-2004 Jean-loup Gailly ";
/*
If you use the zlib library in a product, an acknowledgment is welcome
in the documentation of your product. If for some reason you cannot
* See deflate.c for comments about the MIN_MATCH+1.
*/
+#ifndef RSYNC_WIN
+# define RSYNC_WIN 4096
+#endif
+/* Size of rsync window, must be < MAX_DIST */
+
+#define RSYNC_SUM_MATCH(sum) ((sum) % RSYNC_WIN == 0)
+/* Whether window sum matches magic value */
+
+/* Global rsync mode control variable */
+int zlib_rsync = 1;
+
/* Values for max_lazy_match, good_match and max_chain_length, depending on
* the desired pack level (0..9). The values given below have been tuned to
* exclude worst case performance for pathological files. Better values may be
}
/* ========================================================================= */
-int ZEXPORT deflateInit2_(z_streamp strm, int level, int method,
- int windowBits, int memLevel, int strategy,
- const char *version, int stream_size)
+int ZEXPORT deflateInit2_(z_streamp strm, int level, int method, int windowBits, int memLevel, int strategy, const char *version, int stream_size)
{
deflate_state *s;
int wrap = 1;
#endif
if (memLevel < 1 || memLevel > MAX_MEM_LEVEL || method != Z_DEFLATED ||
windowBits < 8 || windowBits > 15 || level < 0 || level > 9 ||
- strategy < 0 || strategy > Z_RLE) {
+ strategy < 0 || strategy > Z_FIXED) {
return Z_STREAM_ERROR;
}
if (windowBits == 8) windowBits = 9; /* until 256-byte window bug fixed */
s->strm = strm;
s->wrap = wrap;
+ s->gzhead = Z_NULL;
s->w_bits = windowBits;
s->w_size = 1 << s->w_bits;
s->w_mask = s->w_size - 1;
}
/* ========================================================================= */
+int ZEXPORT deflateSetHeader (z_streamp strm, gz_headerp head)
+{
+ if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR;
+ if (strm->state->wrap != 2) return Z_STREAM_ERROR;
+ strm->state->gzhead = head;
+ return Z_OK;
+}
+
+/* ========================================================================= */
int ZEXPORT deflatePrime (z_streamp strm, int bits, int value)
{
if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR;
#else
if (level == Z_DEFAULT_COMPRESSION) level = 6;
#endif
- if (level < 0 || level > 9 || strategy < 0 || strategy > Z_RLE) {
+ if (level < 0 || level > 9 || strategy < 0 || strategy > Z_FIXED) {
return Z_STREAM_ERROR;
}
func = configuration_table[s->level].func;
if (s->status == INIT_STATE) {
#ifdef GZIP
if (s->wrap == 2) {
+ strm->adler = crc32(0L, Z_NULL, 0);
put_byte(s, 31);
put_byte(s, 139);
put_byte(s, 8);
- put_byte(s, 0);
- put_byte(s, 0);
- put_byte(s, 0);
- put_byte(s, 0);
- put_byte(s, 0);
- put_byte(s, s->level == 9 ? 2 :
- (s->strategy >= Z_HUFFMAN_ONLY || s->level < 2 ?
- 4 : 0));
- put_byte(s, 255);
- s->status = BUSY_STATE;
- strm->adler = crc32(0L, Z_NULL, 0);
+ if (s->gzhead == NULL) {
+ put_byte(s, 0);
+ put_byte(s, 0);
+ put_byte(s, 0);
+ put_byte(s, 0);
+ put_byte(s, 0);
+ put_byte(s, s->level == 9 ? 2 :
+ (s->strategy >= Z_HUFFMAN_ONLY || s->level < 2 ?
+ 4 : 0));
+ put_byte(s, OS_CODE);
+ s->status = BUSY_STATE;
+ }
+ else {
+ put_byte(s, (s->gzhead->text ? 1 : 0) +
+ (s->gzhead->hcrc ? 2 : 0) +
+ (s->gzhead->extra == Z_NULL ? 0 : 4) +
+ (s->gzhead->name == Z_NULL ? 0 : 8) +
+ (s->gzhead->comment == Z_NULL ? 0 : 16)
+ );
+ put_byte(s, s->gzhead->time & 0xff);
+ put_byte(s, (s->gzhead->time >> 8) & 0xff);
+ put_byte(s, (s->gzhead->time >> 16) & 0xff);
+ put_byte(s, (s->gzhead->time >> 24) & 0xff);
+ put_byte(s, s->level == 9 ? 2 :
+ (s->strategy >= Z_HUFFMAN_ONLY || s->level < 2 ?
+ 4 : 0));
+ put_byte(s, s->gzhead->os & 0xff);
+ if (s->gzhead->extra != NULL) {
+ put_byte(s, s->gzhead->extra_len & 0xff);
+ put_byte(s, (s->gzhead->extra_len >> 8) & 0xff);
+ }
+ if (s->gzhead->hcrc)
+ strm->adler = crc32(strm->adler, s->pending_buf,
+ s->pending);
+ s->gzindex = 0;
+ s->status = EXTRA_STATE;
+ }
}
else
#endif
strm->adler = adler32(0L, Z_NULL, 0);
}
}
+#ifdef GZIP
+ if (s->status == EXTRA_STATE) {
+ if (s->gzhead->extra != NULL) {
+ int beg = s->pending; /* start of bytes to update crc */
+
+ while (s->gzindex < (s->gzhead->extra_len & 0xffff)) {
+ if (s->pending == s->pending_buf_size) {
+ if (s->gzhead->hcrc && s->pending > beg)
+ strm->adler = crc32(strm->adler, s->pending_buf + beg,
+ s->pending - beg);
+ flush_pending(strm);
+ beg = s->pending;
+ if (s->pending == s->pending_buf_size)
+ break;
+ }
+ put_byte(s, s->gzhead->extra[s->gzindex]);
+ s->gzindex++;
+ }
+ if (s->gzhead->hcrc && s->pending > beg)
+ strm->adler = crc32(strm->adler, s->pending_buf + beg,
+ s->pending - beg);
+ if (s->gzindex == s->gzhead->extra_len) {
+ s->gzindex = 0;
+ s->status = NAME_STATE;
+ }
+ }
+ else
+ s->status = NAME_STATE;
+ }
+ if (s->status == NAME_STATE) {
+ if (s->gzhead->name != NULL) {
+ int beg = s->pending; /* start of bytes to update crc */
+ int val;
+
+ do {
+ if (s->pending == s->pending_buf_size) {
+ if (s->gzhead->hcrc && s->pending > beg)
+ strm->adler = crc32(strm->adler, s->pending_buf + beg,
+ s->pending - beg);
+ flush_pending(strm);
+ beg = s->pending;
+ if (s->pending == s->pending_buf_size) {
+ val = 1;
+ break;
+ }
+ }
+ val = s->gzhead->name[s->gzindex++];
+ put_byte(s, val);
+ } while (val != 0);
+ if (s->gzhead->hcrc && s->pending > beg)
+ strm->adler = crc32(strm->adler, s->pending_buf + beg,
+ s->pending - beg);
+ if (val == 0) {
+ s->gzindex = 0;
+ s->status = COMMENT_STATE;
+ }
+ }
+ else
+ s->status = COMMENT_STATE;
+ }
+ if (s->status == COMMENT_STATE) {
+ if (s->gzhead->comment != NULL) {
+ int beg = s->pending; /* start of bytes to update crc */
+ int val;
+
+ do {
+ if (s->pending == s->pending_buf_size) {
+ if (s->gzhead->hcrc && s->pending > beg)
+ strm->adler = crc32(strm->adler, s->pending_buf + beg,
+ s->pending - beg);
+ flush_pending(strm);
+ beg = s->pending;
+ if (s->pending == s->pending_buf_size) {
+ val = 1;
+ break;
+ }
+ }
+ val = s->gzhead->comment[s->gzindex++];
+ put_byte(s, val);
+ } while (val != 0);
+ if (s->gzhead->hcrc && s->pending > beg)
+ strm->adler = crc32(strm->adler, s->pending_buf + beg,
+ s->pending - beg);
+ if (val == 0)
+ s->status = HCRC_STATE;
+ }
+ else
+ s->status = HCRC_STATE;
+ }
+ if (s->status == HCRC_STATE) {
+ if (s->gzhead->hcrc) {
+ if (s->pending + 2 > s->pending_buf_size)
+ flush_pending(strm);
+ if (s->pending + 2 <= s->pending_buf_size) {
+ put_byte(s, strm->adler & 0xff);
+ put_byte(s, (strm->adler >> 8) & 0xff);
+ strm->adler = crc32(0L, Z_NULL, 0);
+ s->status = BUSY_STATE;
+ }
+ }
+ else
+ s->status = BUSY_STATE;
+ }
+#endif
/* Flush as much pending output as possible */
if (s->pending != 0) {
if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR;
status = strm->state->status;
- if (status != INIT_STATE && status != BUSY_STATE &&
+ if (status != INIT_STATE &&
+ status != EXTRA_STATE &&
+ status != NAME_STATE &&
+ status != COMMENT_STATE &&
+ status != HCRC_STATE &&
+ status != BUSY_STATE &&
status != FINISH_STATE) {
return Z_STREAM_ERROR;
}
ss = source->state;
- *dest = *source;
+ zmemcpy(dest, source, sizeof(z_stream));
ds = (deflate_state *) ZALLOC(dest, 1, sizeof(deflate_state));
if (ds == Z_NULL) return Z_MEM_ERROR;
dest->state = (struct internal_state FAR *) ds;
- *ds = *ss;
+ zmemcpy(ds, ss, sizeof(deflate_state));
ds->strm = dest;
ds->window = (Bytef *) ZALLOC(dest, ds->w_size, 2*sizeof(Byte));
#ifdef ASMV
match_init(); /* initialize the asm code */
#endif
+
+ /* rsync params */
+ s->rsync_chunk_end = 0xFFFFFFFFUL;
+ s->rsync_sum = 0;
}
#ifndef FASTEST
match = s->window + cur_match;
/* Skip to next match if the match length cannot increase
- * or if the match length is less than 2:
+ * or if the match length is less than 2. Note that the checks below
+ * for insufficient lookahead only occur occasionally for performance
+ * reasons. Therefore uninitialized memory will be accessed, and
+ * conditional jumps will be made that depend on those values.
+ * However the length of the match is limited to the lookahead, so
+ * the output of deflate is not affected by the uninitialized values.
*/
#if (defined(UNALIGNED_OK) && MAX_MATCH == 258)
/* This code assumes sizeof(unsigned short) == 2. Do not use
zmemcpy(s->window, s->window+wsize, (unsigned)wsize);
s->match_start -= wsize;
s->strstart -= wsize; /* we now have strstart >= MAX_DIST */
+ if (s->rsync_chunk_end != 0xFFFFFFFFUL)
+ s->rsync_chunk_end -= wsize;
s->block_start -= (long) wsize;
/* Slide the hash table (could be avoided with 32 bit values
} while (s->lookahead < MIN_LOOKAHEAD && s->strm->avail_in != 0);
}
+local void rsync_roll(deflate_state *s, unsigned start, unsigned num)
+{
+ unsigned i;
+
+ if (start < RSYNC_WIN) {
+ /* before window fills. */
+ for (i = start; i < RSYNC_WIN; i++) {
+ if (i == start + num) return;
+ s->rsync_sum += (ulg)s->window[i];
+ }
+ num -= (RSYNC_WIN - start);
+ start = RSYNC_WIN;
+ }
+
+ /* buffer after window full */
+ for (i = start; i < start+num; i++) {
+ /* New character in */
+ s->rsync_sum += (ulg)s->window[i];
+ /* Old character out */
+ s->rsync_sum -= (ulg)s->window[i - RSYNC_WIN];
+ if (s->rsync_chunk_end == 0xFFFFFFFFUL
+ && RSYNC_SUM_MATCH(s->rsync_sum))
+ s->rsync_chunk_end = i;
+ }
+}
+
+/* ===========================================================================
+ * Set rsync_chunk_end if window sum matches magic value.
+ */
+#define RSYNC_ROLL(s, start, num) \
+ do { if (zlib_rsync) rsync_roll((s), (start), (num)); } while(0)
+
/* ===========================================================================
* Flush the current block, with given end-of-file flag.
* IN assertion: strstart is set to the end of the current match.
*/
-#define FLUSH_BLOCK_ONLY(s, eof) { \
+#define FLUSH_BLOCK_ONLY(s, eof, pad) { \
_tr_flush_block(s, (s->block_start >= 0L ? \
(charf *)&s->window[(unsigned)s->block_start] : \
(charf *)Z_NULL), \
(ulg)((long)s->strstart - s->block_start), \
+ (pad), \
(eof)); \
s->block_start = s->strstart; \
flush_pending(s->strm); \
}
/* Same but force premature exit if necessary. */
-#define FLUSH_BLOCK(s, eof) { \
- FLUSH_BLOCK_ONLY(s, eof); \
+#define FLUSH_BLOCK(s, eof, pad) { \
+ FLUSH_BLOCK_ONLY(s, eof, pad); \
if (s->strm->avail_out == 0) return (eof) ? finish_started : need_more; \
}
/* strstart == 0 is possible when wraparound on 16-bit machine */
s->lookahead = (uInt)(s->strstart - max_start);
s->strstart = (uInt)max_start;
- FLUSH_BLOCK(s, 0);
+ FLUSH_BLOCK(s, 0, 0);
}
/* Flush if we may have to slide, otherwise block_start may become
* negative and the data will be gone:
*/
if (s->strstart - (uInt)s->block_start >= MAX_DIST(s)) {
- FLUSH_BLOCK(s, 0);
+ FLUSH_BLOCK(s, 0, 0);
}
}
- FLUSH_BLOCK(s, flush == Z_FINISH);
+ FLUSH_BLOCK(s, flush == Z_FINISH, 0);
return flush == Z_FINISH ? finish_done : block_done;
}
local block_state deflate_fast(deflate_state *s, int flush)
{
IPos hash_head = NIL; /* head of the hash chain */
- int bflush; /* set if current block must be flushed */
+ int bflush = 1; /* set if current block must be flushed */
for (;;) {
/* Make sure that we always have enough lookahead, except
* of the string with itself at the start of the input file).
*/
#ifdef FASTEST
- if ((s->strategy < Z_HUFFMAN_ONLY) ||
+ if ((s->strategy != Z_HUFFMAN_ONLY && s->strategy != Z_RLE) ||
(s->strategy == Z_RLE && s->strstart - hash_head == 1)) {
s->match_length = longest_match_fast (s, hash_head);
}
#else
- if (s->strategy < Z_HUFFMAN_ONLY) {
+ if (s->strategy != Z_HUFFMAN_ONLY && s->strategy != Z_RLE) {
s->match_length = longest_match (s, hash_head);
} else if (s->strategy == Z_RLE && s->strstart - hash_head == 1) {
s->match_length = longest_match_fast (s, hash_head);
s->lookahead -= s->match_length;
+ RSYNC_ROLL(s, s->strstart, s->match_length);
/* Insert new strings in the hash table only if the match length
* is not too large. This saves time but degrades compression.
*/
/* No match, output a literal byte */
Tracevv((stderr,"%c", s->window[s->strstart]));
_tr_tally_lit (s, s->window[s->strstart], bflush);
+ RSYNC_ROLL(s, s->strstart, 1);
s->lookahead--;
s->strstart++;
}
- if (bflush) FLUSH_BLOCK(s, 0);
+ if (zlib_rsync && s->strstart > s->rsync_chunk_end) {
+ s->rsync_chunk_end = 0xFFFFFFFFUL;
+ bflush = 2;
+ }
+ if (bflush) FLUSH_BLOCK(s, 0, bflush-1);
}
- FLUSH_BLOCK(s, flush == Z_FINISH);
+ FLUSH_BLOCK(s, flush == Z_FINISH, bflush-1);
return flush == Z_FINISH ? finish_done : block_done;
}
* of window index 0 (in particular we have to avoid a match
* of the string with itself at the start of the input file).
*/
- if (s->strategy < Z_HUFFMAN_ONLY) {
+ if (s->strategy != Z_HUFFMAN_ONLY && s->strategy != Z_RLE) {
s->match_length = longest_match (s, hash_head);
} else if (s->strategy == Z_RLE && s->strstart - hash_head == 1) {
s->match_length = longest_match_fast (s, hash_head);
*/
s->lookahead -= s->prev_length-1;
s->prev_length -= 2;
+ RSYNC_ROLL(s, s->strstart, s->prev_length+1);
do {
if (++s->strstart <= max_insert) {
INSERT_STRING(s, s->strstart, hash_head);
s->match_length = MIN_MATCH-1;
s->strstart++;
- if (bflush) FLUSH_BLOCK(s, 0);
+ if (zlib_rsync && s->strstart > s->rsync_chunk_end) {
+ s->rsync_chunk_end = 0xFFFFFFFFUL;
+ bflush = 2;
+ }
+ if (bflush) FLUSH_BLOCK(s, 0, bflush-1);
} else if (s->match_available) {
/* If there was no match at the previous position, output a
*/
Tracevv((stderr,"%c", s->window[s->strstart-1]));
_tr_tally_lit(s, s->window[s->strstart-1], bflush);
+ if (zlib_rsync && s->strstart > s->rsync_chunk_end) {
+ s->rsync_chunk_end = 0xFFFFFFFFUL;
+ bflush = 2;
+ }
if (bflush) {
- FLUSH_BLOCK_ONLY(s, 0);
+ FLUSH_BLOCK_ONLY(s, 0, bflush-1);
}
+ RSYNC_ROLL(s, s->strstart, 1);
s->strstart++;
s->lookahead--;
if (s->strm->avail_out == 0) return need_more;
/* There is no previous match to compare with, wait for
* the next step to decide.
*/
+ if (zlib_rsync && s->strstart > s->rsync_chunk_end) {
+ /* Reset huffman tree */
+ s->rsync_chunk_end = 0xFFFFFFFFUL;
+ bflush = 2;
+ FLUSH_BLOCK(s, 0, bflush-1);
+ }
s->match_available = 1;
+ RSYNC_ROLL(s, s->strstart, 1);
s->strstart++;
s->lookahead--;
}
_tr_tally_lit(s, s->window[s->strstart-1], bflush);
s->match_available = 0;
}
- FLUSH_BLOCK(s, flush == Z_FINISH);
+ FLUSH_BLOCK(s, flush == Z_FINISH, bflush-1);
return flush == Z_FINISH ? finish_done : block_done;
}
#endif /* FASTEST */
/* inftrees.c -- generate Huffman trees for efficient decoding
* Copyright (C) 1995-2004 Mark Adler
* For conditions of distribution and use, see copyright notice in zlib.h
+ *
+ * - add https://svn.uhulinux.hu/packages/dev/zlib/patches/02-rsync.patch.
+ *
*/
#include "zutil.h"
#define MAXBITS 15
const char inflate_copyright[] =
- " inflate 1.2.2 Copyright 1995-2004 Mark Adler ";
+ " inflate 1.2.2.f-rpm-rsync Copyright 1995-2004 Mark Adler ";
/*
If you use the zlib library in a product, an acknowledgment is welcome
in the documentation of your product. If for some reason you cannot
35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258, 0, 0};
static const unsigned short lext[31] = { /* Length codes 257..285 extra */
16, 16, 16, 16, 16, 16, 16, 16, 17, 17, 17, 17, 18, 18, 18, 18,
- 19, 19, 19, 19, 20, 20, 20, 20, 21, 21, 21, 21, 16, 199, 198};
+ 19, 19, 19, 19, 20, 20, 20, 20, 21, 21, 21, 21, 16, 72, 199};
static const unsigned short dbase[32] = { /* Distance codes 0..29 base */
1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193,
257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, 6145,
/* zlib.h -- interface of the 'zlib' general purpose compression library
- version 1.2.2, October 3rd, 2004
+ version 1.2.2.2, December 30th, 2004
Copyright (C) 1995-2004 Jean-loup Gailly and Mark Adler
The data format used by the zlib library is described by RFCs (Request for
Comments) 1950 to 1952 in the files http://www.ietf.org/rfc/rfc1950.txt
(zlib format), rfc1951.txt (deflate format) and rfc1952.txt (gzip format).
+
+ - add https://svn.uhulinux.hu/packages/dev/zlib/patches/02-rsync.patch.
+
*/
#ifndef ZLIB_H
extern "C" {
#endif
-#define ZLIB_VERSION "1.2.2"
-#define ZLIB_VERNUM 0x1220
+#define ZLIB_VERSION "1.2.2.f-rpm-rsync"
+#define ZLIB_VERNUM 0x122f
/*
The 'zlib' compression library provides in-memory compression and
struct internal_state;
+/*@-fielduse@*/
typedef struct z_stream_s {
/*@relnull@*/
Bytef *next_in; /* next input byte */
/*@relnull@*/
voidpf opaque; /* private data object passed to zalloc and zfree */
- int data_type; /* best guess about the data type: ascii or binary */
+ int data_type; /* best guess about the data type: binary or text */
uLong adler; /* adler32 value of the uncompressed data */
uLong reserved; /* reserved for future use */
} z_stream;
+/*@=fielduse@*/
typedef z_stream FAR *z_streamp;
/*
+ gzip header information passed to and from zlib routines. See RFC 1952
+ for more details on the meanings of these fields.
+*/
+/*@-fielduse@*/
+typedef struct gz_header_s {
+ int text; /* true if compressed data believed to be text */
+ uLong time; /* modification time */
+ int xflags; /* extra flags (not used when writing a gzip file) */
+ int os; /* operating system */
+ Bytef *extra; /* pointer to extra field or Z_NULL if none */
+ uInt extra_len; /* extra field length (valid if extra != Z_NULL) */
+ uInt extra_max; /* space at extra (only when reading header) */
+ Bytef *name; /* pointer to zero-terminated file name or Z_NULL */
+ uInt name_max; /* space at name (only when reading header) */
+ Bytef *comment; /* pointer to zero-terminated comment or Z_NULL */
+ uInt comm_max; /* space at comment (only when reading header) */
+ int hcrc; /* true if there was or will be a header crc */
+ int done; /* true when done reading gzip header (not used
+ when writing a gzip file) */
+} gz_header;
+/*@=fielduse@*/
+
+typedef gz_header FAR *gz_headerp;
+
+/*
The application must update next_in and avail_in when avail_in has
dropped to zero. It must update next_out and avail_out when avail_out
has dropped to zero. The application must initialize zalloc, zfree and
#define Z_FILTERED 1
#define Z_HUFFMAN_ONLY 2
#define Z_RLE 3
+#define Z_FIXED 4
#define Z_DEFAULT_STRATEGY 0
/* compression strategy; see deflateInit2() below for details */
#define Z_BINARY 0
-#define Z_ASCII 1
+#define Z_TEXT 1
+#define Z_ASCII Z_TEXT /* for compatibility with 1.2.2 and earlier */
#define Z_UNKNOWN 2
/* Possible values of the data_type field (though see inflate()) */
and with zero avail_out, it must be called again after making room in the
output buffer because there might be more output pending.
+ Normally the parameter flush is set to Z_NO_FLUSH, which allows deflate to
+ decide how much data to accumualte before producing output, in order to
+ maximize compression.
+
If the parameter flush is set to Z_SYNC_FLUSH, all pending output is
flushed to the output buffer and the output is aligned on a byte boundary, so
that the decompressor can get all input data available so far. (In particular
Z_SYNC_FLUSH, and the compression state is reset so that decompression can
restart from this point if previous compressed data has been damaged or if
random access is desired. Using Z_FULL_FLUSH too often can seriously degrade
- the compression.
+ compression.
If deflate returns with avail_out == 0, this function must be called again
with the same value of the flush parameter and more output space (updated
deflate() sets strm->adler to the adler32 checksum of all input read
so far (that is, total_in bytes).
- deflate() may update data_type if it can make a good guess about
- the input data type (Z_ASCII or Z_BINARY). In doubt, the data is considered
+ deflate() may update strm->data_type if it can make a good guess about
+ the input data type (Z_BINARY or Z_TEXT). In doubt, the data is considered
binary. This field is only for information purposes and does not affect
the compression algorithm in any manner.
The flush parameter of inflate() can be Z_NO_FLUSH, Z_SYNC_FLUSH,
Z_FINISH, or Z_BLOCK. Z_SYNC_FLUSH requests that inflate() flush as much
output as possible to the output buffer. Z_BLOCK requests that inflate() stop
- if and when it get to the next deflate block boundary. When decoding the zlib
- or gzip format, this will cause inflate() to return immediately after the
- header and before the first block. When doing a raw inflate, inflate() will
- go ahead and process the first block, and will return when it gets to the end
- of that block, or when it runs out of data.
+ if and when it gets to the next deflate block boundary. When decoding the
+ zlib or gzip format, this will cause inflate() to return immediately after
+ the header and before the first block. When doing a raw inflate, inflate()
+ will go ahead and process the first block, and will return when it gets to
+ the end of that block, or when it runs out of data.
The Z_BLOCK option assists in appending to or combining deflate streams.
Also to assist in this, on return inflate() will set strm->data_type to the
Z_DEFAULT and Z_HUFFMAN_ONLY. Z_RLE is designed to be almost as fast as
Z_HUFFMAN_ONLY, but give better compression for PNG image data. The strategy
parameter only affects the compression ratio but not the correctness of the
- compressed output even if it is not set appropriately.
+ compressed output even if it is not set appropriately. Z_FIXED prevents the
+ use of dynamic Huffman codes, allowing for a simpler decoder for special
+ applications.
deflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was not enough
memory, Z_STREAM_ERROR if a parameter is invalid (such as an invalid
stream state was inconsistent.
*/
+ZEXTERN int ZEXPORT deflateSetHeader OF((z_streamp strm,
+ gz_headerp head))
+ /*@modifies strm @*/;
+/*
+ deflateSetHeader() provides gzip header information for when a gzip
+ stream is requested by deflateInit2(). deflateSetHeader() may be called
+ after deflateInit2() or deflateReset() and before the first call of
+ deflate(). The text, time, os, extra field, name, and comment information
+ in the provided gz_header structure are written to the gzip header (xflag is
+ ignored -- the extra flags are set according to the compression level). The
+ caller must assure that, if not Z_NULL, name and comment are terminated with
+ a zero byte, and that if extra is not Z_NULL, that extra_len bytes are
+ available there. If hcrc is true, a gzip header crc is included. Note that
+ the current versions of the command-line version of gzip (up through version
+ 1.3.x) do not support header crc's, and will report that it is a "multi-part
+ gzip file" and give up.
+
+ If deflateSetHeader is not used, the default gzip header has text false,
+ the time set to zero, and os set to 255, with no extra, name, or comment
+ fields. The gzip header is returned to the default state by deflateReset().
+
+ deflateSetHeader returns Z_OK if success, or Z_STREAM_ERROR if the source
+ stream state was inconsistent.
+*/
+
/*
ZEXTERN int ZEXPORT inflateInit2 OF((z_streamp strm,
int windowBits));
/*@modifies strm @*/;
/*
Initializes the decompression dictionary from the given uncompressed byte
- sequence. This function must be called immediately after a call of inflate
- if this call returned Z_NEED_DICT. The dictionary chosen by the compressor
- can be determined from the adler32 value returned by this call of
- inflate. The compressor and decompressor must use exactly the same
- dictionary (see deflateSetDictionary).
+ sequence. This function must be called immediately after a call of inflate,
+ if that call returned Z_NEED_DICT. The dictionary chosen by the compressor
+ can be determined from the adler32 value returned by that call of inflate.
+ The compressor and decompressor must use exactly the same dictionary (see
+ deflateSetDictionary). For raw inflate, this function can be called
+ immediately after inflateInit2() or inflateReset() and before any call of
+ inflate() to set the dictionary. The application must insure that the
+ dictionary that was used for compression is provided.
inflateSetDictionary returns Z_OK if success, Z_STREAM_ERROR if a
parameter is invalid (such as NULL dictionary) or the stream state is
stream state was inconsistent (such as zalloc or state being NULL).
*/
+ZEXTERN int ZEXPORT inflateGetHeader OF((z_streamp strm,
+ gz_headerp head))
+ /*@modifies strm, head @*/;
/*
-ZEXTERN int ZEXPORT inflateBackInit OF((z_stream FAR *strm, int windowBits,
+ inflateGetHeader() requests that gzip header information be stored in the
+ provided gz_header structure. inflateGetHeader() may be called after
+ inflateInit2() or inflateReset(), and before the first call of inflate().
+ As inflate() processes the gzip stream, head->done is zero until the header
+ is completed, at which time head->done is set to one. If a zlib stream is
+ being decoded, then head->done is set to -1 to indicate that there will be
+ no gzip header information forthcoming. Note that Z_BLOCK can be used to
+ force inflate() to return immediately after header processing is complete
+ and before any actual data is decompressed.
+
+ The text, time, xflags, and os fields are filled in with the gzip header
+ contents. hcrc is set to true if there is a header CRC. (The header CRC
+ was valid if done is set to one.) If extra is not Z_NULL, then extra_max
+ contains the maximum number of bytes to write to extra. Once done is true,
+ extra_len contains the actual extra field length, and extra contains the
+ extra field, or that field truncated if extra_max is less than extra_len.
+ If name is not Z_NULL, then up to name_max characters are written there,
+ terminated with a zero unless the length is greater than name_max. If
+ comment is not Z_NULL, then up to comm_max characters are written there,
+ terminated with a zero unless the length is greater than comm_max. When
+ any of extra, name, or comment are not Z_NULL and the respective field is
+ not present in the header, then that field is set to Z_NULL to signal its
+ absence. This allows the use of deflateSetHeader() with the returned
+ structure to duplicate the header. However if those fields are set to
+ allocated memory, then the application will need to save those pointers
+ elsewhere so that they can be eventually freed.
+
+ If inflateGetHeader is not used, then the header information is simply
+ discarded. The header is always checked for validity, including the header
+ CRC if present. inflateReset() will reset the process to discard the header
+ information. The application would need to call inflateGetHeader() again to
+ retrieve the header from the next gzip stream.
+
+ inflateGetHeader returns Z_OK if success, or Z_STREAM_ERROR if the source
+ stream state was inconsistent.
+*/
+
+/*
+ZEXTERN int ZEXPORT inflateBackInit OF((z_streamp strm, int windowBits,
unsigned char FAR *window));
Initialize the internal stream state for decompression using inflateBack()
typedef int (*out_func) OF((void FAR *, unsigned char FAR *, unsigned))
/*@*/;
-ZEXTERN int ZEXPORT inflateBack OF((z_stream FAR *strm,
+ZEXTERN int ZEXPORT inflateBack OF((z_streamp strm,
in_func in, void FAR *in_desc,
out_func out, void FAR *out_desc))
/*@modifies strm @*/;
that inflateBack() cannot return Z_OK.
*/
-ZEXTERN int ZEXPORT inflateBackEnd OF((z_stream FAR *strm))
+ZEXTERN int ZEXPORT inflateBackEnd OF((z_streamp strm))
/*@modifies strm @*/;
/*
All memory allocated by inflateBackInit() is freed.
ZEXTERN uLong ZEXPORT adler32 OF((uLong adler, const Bytef *buf, uInt len))
/*@*/;
-
/*
Update a running Adler-32 checksum with the bytes buf[0..len-1] and
return the updated checksum. If buf is NULL, this function returns
if (adler != original_adler) error();
*/
+ZEXTERN uLong ZEXPORT adler32_combine OF((uLong adler1, uLong adler2,
+ z_off_t len2))
+ /*@*/;
+/*
+ Combine two Adler-32 checksums into one. For two sequences of bytes, seq1
+ and seq2 with lengths len1 and len2, Adler-32 checksums were calculated for
+ each, adler1 and adler2. adler32_combine() returns the Adler-32 checksum of
+ seq1 and seq2 concatenated, requiring only adler1, adler2, and len2.
+*/
+
ZEXTERN uLong ZEXPORT crc32 OF((uLong crc, const Bytef *buf, uInt len))
/*@*/;
/*
- Update a running crc with the bytes buf[0..len-1] and return the updated
- crc. If buf is NULL, this function returns the required initial value
- for the crc. Pre- and post-conditioning (one's complement) is performed
- within this function so it shouldn't be done by the application.
+ Update a running CRC-32 with the bytes buf[0..len-1] and return the
+ updated CRC-32. If buf is NULL, this function returns the required initial
+ value for the for the crc. Pre- and post-conditioning (one's complement) is
+ performed within this function so it shouldn't be done by the application.
Usage example:
uLong crc = crc32(0L, Z_NULL, 0);
if (crc != original_crc) error();
*/
+ZEXTERN uLong ZEXPORT crc32_combine OF((uLong crc1, uLong crc2, z_off_t len2))
+ /*@*/;
+
+/*
+ Combine two CRC-32 check values into one. For two sequences of bytes,
+ seq1 and seq2 with lengths len1 and len2, CRC-32 check values were
+ calculated for each, crc1 and crc2. crc32_combine() returns the CRC-32
+ check value of seq1 and seq2 concatenated, requiring only crc1, crc2, and
+ len2.
+*/
+
/* various hacks, don't look :) */
ZEXTERN int ZEXPORT inflateInit2_ OF((z_streamp strm, int windowBits,
const char *version, int stream_size))
/*@modifies strm @*/;
-ZEXTERN int ZEXPORT inflateBackInit_ OF((z_stream FAR *strm, int windowBits,
+ZEXTERN int ZEXPORT inflateBackInit_ OF((z_streamp strm, int windowBits,
unsigned char FAR *window,
const char *version,
int stream_size))
#if !defined(ZUTIL_H) && !defined(NO_DUMMY_DECL)
- struct internal_state {int dummy;}; /* hack for buggy compilers */
+ struct internal_state {/*@unused@*/ int dummy;}; /* hack for buggy compilers */
#endif
/*@observer@*/
ZEXTERN const uLongf * ZEXPORT get_crc_table OF((void))
/*@*/;
+/* Global rsync mode control variable */
+extern int zlib_rsync;
+
+
#ifdef __cplusplus
}
#endif
projects / platform / upstream / rpm.git / commitdiff