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Imported from pngcrush-1.3.0.tar

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This commit is contained in:
Glenn Randers-Pehrson
1999-12-21 11:25:28 -06:00
parent ce85ad6640
commit 7a16d67a4b
26 changed files with 6719 additions and 674 deletions
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17
deflate.c
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@@ -101,7 +101,7 @@ local void check_match OF((deflate_state *s, IPos start, IPos match,
/* Tail of hash chains */
#ifndef TOO_FAR
# define TOO_FAR 32767 /* changed from 4096 for pngcrush */
# define TOO_FAR 4096
#endif
/* Matches of length 3 are discarded if their distance exceeds TOO_FAR */
@@ -261,8 +261,10 @@ int ZEXPORT deflateInit2_(strm, level, method, windowBits, memLevel, strategy,
s->hash_mask = s->hash_size - 1;
s->hash_shift = ((s->hash_bits+MIN_MATCH-1)/MIN_MATCH);
s->window = (Bytef *) ZALLOC(strm, s->w_size, 2*sizeof(Byte));
s->prev = (Posf *) ZALLOC(strm, s->w_size, sizeof(Pos));
s->window = (Bytef *) ZALLOC(strm, (windowBits == 8 ? 264 : s->w_size),
2*sizeof(Byte));
s->prev = (Posf *) ZALLOC(strm, (windowBits == 8 ? 264 : s->w_size),
sizeof(Pos));
s->head = (Posf *) ZALLOC(strm, s->hash_size, sizeof(Pos));
s->lit_bufsize = 1 << (memLevel + 6); /* 16K elements by default */
@@ -1277,12 +1279,9 @@ local block_state deflate_slow(s, flush)
}
/* longest_match() sets match_start */
if (s->match_length <= 5 && (s->strategy == Z_FILTERED
#if (TOO_FAR <= 32767)
|| (s->match_length == MIN_MATCH &&
s->strstart - s->match_start > TOO_FAR)
#endif
)) {
if (s->match_length <= 5 && (s->strategy == Z_FILTERED ||
(s->match_length == MIN_MATCH &&
s->strstart - s->match_start > TOO_FAR))) {
/* If prev_match is also MIN_MATCH, match_start is garbage
* but we will ignore the current match anyway.