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zlib 1.2.2.4

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This commit is contained in:
Mark Adler
2011-09-09 23:24:52 -07:00
parent 6b8233bfe0
commit 9c3a583021
29 changed files with 1035 additions and 137 deletions
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82
deflate.c
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@@ -52,7 +52,7 @@
#include "deflate.h"
const char deflate_copyright[] =
" deflate 1.2.2.3 Copyright 1995-2005 Jean-loup Gailly ";
" deflate 1.2.2.4 Copyright 1995-2005 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
@@ -600,10 +600,10 @@ int ZEXPORT deflate (strm, flush)
(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, (Byte)(s->gzhead->time & 0xff));
put_byte(s, (Byte)((s->gzhead->time >> 8) & 0xff));
put_byte(s, (Byte)((s->gzhead->time >> 16) & 0xff));
put_byte(s, (Byte)((s->gzhead->time >> 24) & 0xff));
put_byte(s, s->level == 9 ? 2 :
(s->strategy >= Z_HUFFMAN_ONLY || s->level < 2 ?
4 : 0));
@@ -651,7 +651,7 @@ int ZEXPORT deflate (strm, flush)
#ifdef GZIP
if (s->status == EXTRA_STATE) {
if (s->gzhead->extra != NULL) {
int beg = s->pending; /* start of bytes to update crc */
uInt beg = s->pending; /* start of bytes to update crc */
while (s->gzindex < (s->gzhead->extra_len & 0xffff)) {
if (s->pending == s->pending_buf_size) {
@@ -679,7 +679,7 @@ int ZEXPORT deflate (strm, flush)
}
if (s->status == NAME_STATE) {
if (s->gzhead->name != NULL) {
int beg = s->pending; /* start of bytes to update crc */
uInt beg = s->pending; /* start of bytes to update crc */
int val;
do {
@@ -710,7 +710,7 @@ int ZEXPORT deflate (strm, flush)
}
if (s->status == COMMENT_STATE) {
if (s->gzhead->comment != NULL) {
int beg = s->pending; /* start of bytes to update crc */
uInt beg = s->pending; /* start of bytes to update crc */
int val;
do {
@@ -742,8 +742,8 @@ int ZEXPORT deflate (strm, flush)
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);
put_byte(s, (Byte)(strm->adler & 0xff));
put_byte(s, (Byte)((strm->adler >> 8) & 0xff));
strm->adler = crc32(0L, Z_NULL, 0);
s->status = BUSY_STATE;
}
@@ -1303,6 +1303,7 @@ local void fill_window(s)
later. (Using level 0 permanently is not an optimal usage of
zlib, so we don't care about this pathological case.)
*/
/* %%% avoid this when Z_RLE */
n = s->hash_size;
p = &s->head[n];
do {
@@ -1672,3 +1673,64 @@ local block_state deflate_slow(s, flush)
return flush == Z_FINISH ? finish_done : block_done;
}
#endif /* FASTEST */
#if 0
/* ===========================================================================
* For Z_RLE, simply look for runs of bytes, generate matches only of distance
* one. Do not maintain a hash table. (It will be regenerated if this run of
* deflate switches away from Z_RLE.)
*/
local block_state deflate_rle(s, flush)
deflate_state *s;
int flush;
{
int bflush; /* set if current block must be flushed */
uInt run; /* length of run */
uInt max; /* maximum length of run */
uInt prev; /* byte at distance one to match */
Bytef *scan; /* scan for end of run */
for (;;) {
/* Make sure that we always have enough lookahead, except
* at the end of the input file. We need MAX_MATCH bytes
* for the longest encodable run.
*/
if (s->lookahead < MAX_MATCH) {
fill_window(s);
if (s->lookahead < MAX_MATCH && flush == Z_NO_FLUSH) {
return need_more;
}
if (s->lookahead == 0) break; /* flush the current block */
}
/* See how many times the previous byte repeats */
run = 0;
if (s->strstart > 0) { /* if there is a previous byte, that is */
max = s->lookahead < MAX_MATCH ? s->lookahead : MAX_MATCH;
scan = s->window + s->strstart - 1;
prev = *scan++;
do {
if (*scan++ != prev)
break;
} while (++run < max);
}
/* Emit match if have run of MIN_MATCH or longer, else emit literal */
if (run >= MIN_MATCH) {
check_match(s, s->strstart, s->strstart - 1, run);
_tr_tally_dist(s, 1, run - MIN_MATCH, bflush);
s->lookahead -= run;
s->strstart += run;
} else {
/* No match, output a literal byte */
Tracevv((stderr,"%c", s->window[s->strstart]));
_tr_tally_lit (s, s->window[s->strstart], bflush);
s->lookahead--;
s->strstart++;
}
if (bflush) FLUSH_BLOCK(s, 0);
}
FLUSH_BLOCK(s, flush == Z_FINISH);
return flush == Z_FINISH ? finish_done : block_done;
}
#endif