1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
|
/* deflate_p.h -- Private inline functions and macros shared with more than
* one deflate method
*
* Copyright (C) 1995-2013 Jean-loup Gailly and Mark Adler
* For conditions of distribution and use, see copyright notice in zlib.h
*
*/
#ifndef DEFLATE_P_H
#define DEFLATE_P_H
/* Forward declare common non-inlined functions declared in deflate.c */
#ifdef ZLIB_DEBUG
void check_match(deflate_state *s, Pos start, Pos match, int length);
#else
#define check_match(s, start, match, length)
#endif
void flush_pending(PREFIX3(stream) *strm);
/* ===========================================================================
* Save the match info and tally the frequency counts. Return true if
* the current block must be flushed.
*/
extern const unsigned char Z_INTERNAL zng_length_code[];
extern const unsigned char Z_INTERNAL zng_dist_code[];
static inline int zng_tr_tally_lit(deflate_state *s, unsigned char c) {
/* c is the unmatched char */
s->sym_buf[s->sym_next++] = 0;
s->sym_buf[s->sym_next++] = 0;
s->sym_buf[s->sym_next++] = c;
s->dyn_ltree[c].Freq++;
Tracevv((stderr, "%c", c));
Assert(c <= (MAX_MATCH-MIN_MATCH), "zng_tr_tally: bad literal");
return (s->sym_next == s->sym_end);
}
static inline int zng_tr_tally_dist(deflate_state *s, uint32_t dist, uint32_t len) {
/* dist: distance of matched string */
/* len: match length-MIN_MATCH */
s->sym_buf[s->sym_next++] = (uint8_t)(dist);
s->sym_buf[s->sym_next++] = (uint8_t)(dist >> 8);
s->sym_buf[s->sym_next++] = (uint8_t)len;
s->matches++;
dist--;
Assert(dist < MAX_DIST(s) && (uint16_t)d_code(dist) < (uint16_t)D_CODES,
"zng_tr_tally: bad match");
s->dyn_ltree[zng_length_code[len]+LITERALS+1].Freq++;
s->dyn_dtree[d_code(dist)].Freq++;
return (s->sym_next == s->sym_end);
}
/* ===========================================================================
* 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, last) { \
zng_tr_flush_block(s, (s->block_start >= 0 ? \
(char *)&s->window[(unsigned)s->block_start] : \
NULL), \
(uint32_t)((int)s->strstart - s->block_start), \
(last)); \
s->block_start = (int)s->strstart; \
flush_pending(s->strm); \
}
/* Same but force premature exit if necessary. */
#define FLUSH_BLOCK(s, last) { \
FLUSH_BLOCK_ONLY(s, last); \
if (s->strm->avail_out == 0) return (last) ? finish_started : need_more; \
}
/* Maximum stored block length in deflate format (not including header). */
#define MAX_STORED 65535
#endif
|
