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zlib 1.1.0

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This commit is contained in:
Mark Adler
2011-09-09 23:19:55 -07:00
parent b8c9ecb076
commit 965fe72aed
17 changed files with 262 additions and 68 deletions
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31
trees.c
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@@ -99,13 +99,13 @@ local ct_data static_dtree[D_CODES];
* 5 bits.)
*/
local uch dist_code[DIST_CODE_LEN];
uch _dist_code[DIST_CODE_LEN];
/* Distance codes. The first 256 values correspond to the distances
* 3 .. 258, the last 256 values correspond to the top 8 bits of
* the 15 bit distances.
*/
local uch length_code[MAX_MATCH-MIN_MATCH+1];
uch _length_code[MAX_MATCH-MIN_MATCH+1];
/* length code for each normalized match length (0 == MIN_MATCH) */
local int base_length[LENGTH_CODES];
@@ -173,13 +173,6 @@ local void gen_trees_header OF((void));
send_bits(s, tree[c].Code, tree[c].Len); }
#endif
#define d_code(dist) \
((dist) < 256 ? dist_code[dist] : dist_code[256+((dist)>>7)])
/* Mapping from a distance to a distance code. dist is the distance - 1 and
* must not have side effects. dist_code[256] and dist_code[257] are never
* used.
*/
/* ===========================================================================
* Output a short LSB first on the stream.
* IN assertion: there is enough room in pendingBuf.
@@ -262,7 +255,7 @@ local void tr_static_init()
for (code = 0; code < LENGTH_CODES-1; code++) {
base_length[code] = length;
for (n = 0; n < (1<<extra_lbits[code]); n++) {
length_code[length++] = (uch)code;
_length_code[length++] = (uch)code;
}
}
Assert (length == 256, "tr_static_init: length != 256");
@@ -270,14 +263,14 @@ local void tr_static_init()
* in two different ways: code 284 + 5 bits or code 285, so we
* overwrite length_code[255] to use the best encoding:
*/
length_code[length-1] = (uch)code;
_length_code[length-1] = (uch)code;
/* Initialize the mapping dist (0..32K) -> dist code (0..29) */
dist = 0;
for (code = 0 ; code < 16; code++) {
base_dist[code] = dist;
for (n = 0; n < (1<<extra_dbits[code]); n++) {
dist_code[dist++] = (uch)code;
_dist_code[dist++] = (uch)code;
}
}
Assert (dist == 256, "tr_static_init: dist != 256");
@@ -285,7 +278,7 @@ local void tr_static_init()
for ( ; code < D_CODES; code++) {
base_dist[code] = dist << 7;
for (n = 0; n < (1<<(extra_dbits[code]-7)); n++) {
dist_code[256 + dist++] = (uch)code;
_dist_code[256 + dist++] = (uch)code;
}
}
Assert (dist == 256, "tr_static_init: 256+dist != 512");
@@ -349,15 +342,15 @@ void gen_trees_header()
static_dtree[i].Len, SEPARATOR(i, D_CODES-1, 5));
}
fprintf(header, "local const uch dist_code[DIST_CODE_LEN] = {\n");
fprintf(header, "const uch _dist_code[DIST_CODE_LEN] = {\n");
for (i = 0; i < DIST_CODE_LEN; i++) {
fprintf(header, "%2u%s", dist_code[i],
fprintf(header, "%2u%s", _dist_code[i],
SEPARATOR(i, DIST_CODE_LEN-1, 20));
}
fprintf(header, "local const uch length_code[MAX_MATCH-MIN_MATCH+1]= {\n");
fprintf(header, "const uch _length_code[MAX_MATCH-MIN_MATCH+1]= {\n");
for (i = 0; i < MAX_MATCH-MIN_MATCH+1; i++) {
fprintf(header, "%2u%s", length_code[i],
fprintf(header, "%2u%s", _length_code[i],
SEPARATOR(i, MAX_MATCH-MIN_MATCH, 20));
}
@@ -1045,7 +1038,7 @@ int _tr_tally (s, dist, lc)
(ush)lc <= (ush)(MAX_MATCH-MIN_MATCH) &&
(ush)d_code(dist) < (ush)D_CODES, "_tr_tally: bad match");
s->dyn_ltree[length_code[lc]+LITERALS+1].Freq++;
s->dyn_ltree[_length_code[lc]+LITERALS+1].Freq++;
s->dyn_dtree[d_code(dist)].Freq++;
}
@@ -1094,7 +1087,7 @@ local void compress_block(s, ltree, dtree)
Tracecv(isgraph(lc), (stderr," '%c' ", lc));
} else {
/* Here, lc is the match length - MIN_MATCH */
code = length_code[lc];
code = _length_code[lc];
send_code(s, code+LITERALS+1, ltree); /* send the length code */
extra = extra_lbits[code];
if (extra != 0) {