1820 lines
49 KiB
C
1820 lines
49 KiB
C
|
|
|
|
|
|
|
|
|
|
|
|
#include "deflate.h"
|
|
|
|
const char deflate_copyright[] =
|
|
" deflate 1.2.11 Copyright 1995-2017 Jean-loup Gailly and Mark Adler ";
|
|
|
|
|
|
|
|
typedef enum {
|
|
need_more,
|
|
block_done,
|
|
finish_started,
|
|
finish_done
|
|
} block_state;
|
|
|
|
typedef block_state (*compress_func) OF((deflate_state *s, int flush));
|
|
|
|
|
|
local int deflateStateCheck OF((z_streamp strm));
|
|
local void slide_hash OF((deflate_state *s));
|
|
local void fill_window OF((deflate_state *s));
|
|
local block_state deflate_stored OF((deflate_state *s, int flush));
|
|
local block_state deflate_fast OF((deflate_state *s, int flush));
|
|
#ifndef FASTEST
|
|
local block_state deflate_slow OF((deflate_state *s, int flush));
|
|
#endif
|
|
local block_state deflate_rle OF((deflate_state *s, int flush));
|
|
local block_state deflate_huff OF((deflate_state *s, int flush));
|
|
local void lm_init OF((deflate_state *s));
|
|
local void putShortMSB OF((deflate_state *s, uInt b));
|
|
local void flush_pending OF((z_streamp strm));
|
|
local unsigned read_buf OF((z_streamp strm, Bytef *buf, unsigned size));
|
|
#ifdef ASMV
|
|
# pragma message("Assembler code may have bugs -- use at your own risk")
|
|
void match_init OF((void));
|
|
uInt longest_match OF((deflate_state *s, IPos cur_match));
|
|
#else
|
|
local uInt longest_match OF((deflate_state *s, IPos cur_match));
|
|
#endif
|
|
|
|
#ifdef ZLIB_DEBUG
|
|
local void check_match OF((deflate_state *s, IPos start, IPos match,
|
|
int length));
|
|
#endif
|
|
|
|
|
|
|
|
#define NIL 0
|
|
|
|
|
|
#ifndef TOO_FAR
|
|
# define TOO_FAR 4096
|
|
#endif
|
|
|
|
|
|
|
|
typedef struct config_s {
|
|
ush good_length;
|
|
ush max_lazy;
|
|
ush nice_length;
|
|
ush max_chain;
|
|
compress_func func;
|
|
} config;
|
|
|
|
#ifdef FASTEST
|
|
local const config configuration_table[2] = {
|
|
|
|
{0, 0, 0, 0, deflate_stored},
|
|
{4, 4, 8, 4, deflate_fast}};
|
|
#else
|
|
local const config configuration_table[10] = {
|
|
|
|
{0, 0, 0, 0, deflate_stored},
|
|
{4, 4, 8, 4, deflate_fast},
|
|
{4, 5, 16, 8, deflate_fast},
|
|
{4, 6, 32, 32, deflate_fast},
|
|
|
|
{4, 4, 16, 16, deflate_slow},
|
|
{8, 16, 32, 32, deflate_slow},
|
|
{8, 16, 128, 128, deflate_slow},
|
|
{8, 32, 128, 256, deflate_slow},
|
|
{32, 128, 258, 1024, deflate_slow},
|
|
{32, 258, 258, 4096, deflate_slow}};
|
|
#endif
|
|
|
|
|
|
|
|
|
|
#define RANK(f) (((f) * 2) - ((f) > 4 ? 9 : 0))
|
|
|
|
|
|
#define UPDATE_HASH(s,h,c) (h = (((h)<<s->hash_shift) ^ (c)) & s->hash_mask)
|
|
|
|
|
|
|
|
#ifdef FASTEST
|
|
#define INSERT_STRING(s, str, match_head) \
|
|
(UPDATE_HASH(s, s->ins_h, s->window[(str) + (MIN_MATCH-1)]), \
|
|
match_head = s->head[s->ins_h], \
|
|
s->head[s->ins_h] = (Pos)(str))
|
|
#else
|
|
#define INSERT_STRING(s, str, match_head) \
|
|
(UPDATE_HASH(s, s->ins_h, s->window[(str) + (MIN_MATCH-1)]), \
|
|
match_head = s->prev[(str) & s->w_mask] = s->head[s->ins_h], \
|
|
s->head[s->ins_h] = (Pos)(str))
|
|
#endif
|
|
|
|
|
|
#define CLEAR_HASH(s) \
|
|
s->head[s->hash_size-1] = NIL; \
|
|
zmemzero((Bytef *)s->head, (unsigned)(s->hash_size-1)*sizeof(*s->head));
|
|
|
|
|
|
local void slide_hash(s)
|
|
deflate_state *s;
|
|
{
|
|
unsigned n, m;
|
|
Posf *p;
|
|
uInt wsize = s->w_size;
|
|
|
|
n = s->hash_size;
|
|
p = &s->head[n];
|
|
do {
|
|
m = *--p;
|
|
*p = (Pos)(m >= wsize ? m - wsize : NIL);
|
|
} while (--n);
|
|
n = wsize;
|
|
#ifndef FASTEST
|
|
p = &s->prev[n];
|
|
do {
|
|
m = *--p;
|
|
*p = (Pos)(m >= wsize ? m - wsize : NIL);
|
|
|
|
} while (--n);
|
|
#endif
|
|
}
|
|
|
|
|
|
int ZEXPORT deflateInit_(strm, level, version, stream_size)
|
|
z_streamp strm;
|
|
int level;
|
|
const char *version;
|
|
int stream_size;
|
|
{
|
|
return deflateInit2_(strm, level, Z_DEFLATED, MAX_WBITS, DEF_MEM_LEVEL,
|
|
Z_DEFAULT_STRATEGY, version, stream_size);
|
|
|
|
}
|
|
|
|
|
|
int ZEXPORT deflateInit2_(strm, level, method, windowBits, memLevel, strategy,
|
|
version, stream_size)
|
|
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;
|
|
static const char my_version[] = ZLIB_VERSION;
|
|
|
|
ushf *overlay;
|
|
|
|
|
|
if (version == Z_NULL || version[0] != my_version[0] ||
|
|
stream_size != sizeof(z_stream)) {
|
|
return Z_VERSION_ERROR;
|
|
}
|
|
if (strm == Z_NULL) return Z_STREAM_ERROR;
|
|
|
|
strm->msg = Z_NULL;
|
|
if (strm->zalloc == (alloc_func)0) {
|
|
#ifdef Z_SOLO
|
|
return Z_STREAM_ERROR;
|
|
#else
|
|
strm->zalloc = zcalloc;
|
|
strm->opaque = (voidpf)0;
|
|
#endif
|
|
}
|
|
if (strm->zfree == (free_func)0)
|
|
#ifdef Z_SOLO
|
|
return Z_STREAM_ERROR;
|
|
#else
|
|
strm->zfree = zcfree;
|
|
#endif
|
|
|
|
#ifdef FASTEST
|
|
if (level != 0) level = 1;
|
|
#else
|
|
if (level == Z_DEFAULT_COMPRESSION) level = 6;
|
|
#endif
|
|
|
|
if (windowBits < 0) {
|
|
wrap = 0;
|
|
windowBits = -windowBits;
|
|
}
|
|
#ifdef GZIP
|
|
else if (windowBits > 15) {
|
|
wrap = 2;
|
|
windowBits -= 16;
|
|
}
|
|
#endif
|
|
if (memLevel < 1 || memLevel > MAX_MEM_LEVEL || method != Z_DEFLATED ||
|
|
windowBits < 8 || windowBits > 15 || level < 0 || level > 9 ||
|
|
strategy < 0 || strategy > Z_FIXED || (windowBits == 8 && wrap != 1)) {
|
|
return Z_STREAM_ERROR;
|
|
}
|
|
if (windowBits == 8) windowBits = 9;
|
|
s = (deflate_state *) ZALLOC(strm, 1, sizeof(deflate_state));
|
|
if (s == Z_NULL) return Z_MEM_ERROR;
|
|
strm->state = (struct internal_state FAR *)s;
|
|
s->strm = strm;
|
|
s->status = INIT_STATE;
|
|
|
|
s->wrap = wrap;
|
|
s->gzhead = Z_NULL;
|
|
s->w_bits = (uInt)windowBits;
|
|
s->w_size = 1 << s->w_bits;
|
|
s->w_mask = s->w_size - 1;
|
|
|
|
s->hash_bits = (uInt)memLevel + 7;
|
|
s->hash_size = 1 << s->hash_bits;
|
|
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->head = (Posf *) ZALLOC(strm, s->hash_size, sizeof(Pos));
|
|
|
|
s->high_water = 0;
|
|
|
|
s->lit_bufsize = 1 << (memLevel + 6);
|
|
|
|
overlay = (ushf *) ZALLOC(strm, s->lit_bufsize, sizeof(ush)+2);
|
|
s->pending_buf = (uchf *) overlay;
|
|
s->pending_buf_size = (ulg)s->lit_bufsize * (sizeof(ush)+2L);
|
|
|
|
if (s->window == Z_NULL || s->prev == Z_NULL || s->head == Z_NULL ||
|
|
s->pending_buf == Z_NULL) {
|
|
s->status = FINISH_STATE;
|
|
strm->msg = ERR_MSG(Z_MEM_ERROR);
|
|
deflateEnd (strm);
|
|
return Z_MEM_ERROR;
|
|
}
|
|
s->d_buf = overlay + s->lit_bufsize/sizeof(ush);
|
|
s->l_buf = s->pending_buf + (1+sizeof(ush))*s->lit_bufsize;
|
|
|
|
s->level = level;
|
|
s->strategy = strategy;
|
|
s->method = (Byte)method;
|
|
|
|
return deflateReset(strm);
|
|
}
|
|
|
|
|
|
local int deflateStateCheck (strm)
|
|
z_streamp strm;
|
|
{
|
|
deflate_state *s;
|
|
if (strm == Z_NULL ||
|
|
strm->zalloc == (alloc_func)0 || strm->zfree == (free_func)0)
|
|
return 1;
|
|
s = strm->state;
|
|
if (s == Z_NULL || s->strm != strm || (s->status != INIT_STATE &&
|
|
#ifdef GZIP
|
|
s->status != GZIP_STATE &&
|
|
#endif
|
|
s->status != EXTRA_STATE &&
|
|
s->status != NAME_STATE &&
|
|
s->status != COMMENT_STATE &&
|
|
s->status != HCRC_STATE &&
|
|
s->status != BUSY_STATE &&
|
|
s->status != FINISH_STATE))
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
|
|
int ZEXPORT deflateSetDictionary (strm, dictionary, dictLength)
|
|
z_streamp strm;
|
|
const Bytef *dictionary;
|
|
uInt dictLength;
|
|
{
|
|
deflate_state *s;
|
|
uInt str, n;
|
|
int wrap;
|
|
unsigned avail;
|
|
z_const unsigned char *next;
|
|
|
|
if (deflateStateCheck(strm) || dictionary == Z_NULL)
|
|
return Z_STREAM_ERROR;
|
|
s = strm->state;
|
|
wrap = s->wrap;
|
|
if (wrap == 2 || (wrap == 1 && s->status != INIT_STATE) || s->lookahead)
|
|
return Z_STREAM_ERROR;
|
|
|
|
|
|
if (wrap == 1)
|
|
strm->adler = adler32(strm->adler, dictionary, dictLength);
|
|
s->wrap = 0;
|
|
|
|
|
|
if (dictLength >= s->w_size) {
|
|
if (wrap == 0) {
|
|
CLEAR_HASH(s);
|
|
s->strstart = 0;
|
|
s->block_start = 0L;
|
|
s->insert = 0;
|
|
}
|
|
dictionary += dictLength - s->w_size;
|
|
dictLength = s->w_size;
|
|
}
|
|
|
|
|
|
avail = strm->avail_in;
|
|
next = strm->next_in;
|
|
strm->avail_in = dictLength;
|
|
strm->next_in = (z_const Bytef *)dictionary;
|
|
fill_window(s);
|
|
while (s->lookahead >= MIN_MATCH) {
|
|
str = s->strstart;
|
|
n = s->lookahead - (MIN_MATCH-1);
|
|
do {
|
|
UPDATE_HASH(s, s->ins_h, s->window[str + MIN_MATCH-1]);
|
|
#ifndef FASTEST
|
|
s->prev[str & s->w_mask] = s->head[s->ins_h];
|
|
#endif
|
|
s->head[s->ins_h] = (Pos)str;
|
|
str++;
|
|
} while (--n);
|
|
s->strstart = str;
|
|
s->lookahead = MIN_MATCH-1;
|
|
fill_window(s);
|
|
}
|
|
s->strstart += s->lookahead;
|
|
s->block_start = (long)s->strstart;
|
|
s->insert = s->lookahead;
|
|
s->lookahead = 0;
|
|
s->match_length = s->prev_length = MIN_MATCH-1;
|
|
s->match_available = 0;
|
|
strm->next_in = next;
|
|
strm->avail_in = avail;
|
|
s->wrap = wrap;
|
|
return Z_OK;
|
|
}
|
|
|
|
|
|
int ZEXPORT deflateGetDictionary (strm, dictionary, dictLength)
|
|
z_streamp strm;
|
|
Bytef *dictionary;
|
|
uInt *dictLength;
|
|
{
|
|
deflate_state *s;
|
|
uInt len;
|
|
|
|
if (deflateStateCheck(strm))
|
|
return Z_STREAM_ERROR;
|
|
s = strm->state;
|
|
len = s->strstart + s->lookahead;
|
|
if (len > s->w_size)
|
|
len = s->w_size;
|
|
if (dictionary != Z_NULL && len)
|
|
zmemcpy(dictionary, s->window + s->strstart + s->lookahead - len, len);
|
|
if (dictLength != Z_NULL)
|
|
*dictLength = len;
|
|
return Z_OK;
|
|
}
|
|
|
|
|
|
int ZEXPORT deflateResetKeep (strm)
|
|
z_streamp strm;
|
|
{
|
|
deflate_state *s;
|
|
|
|
if (deflateStateCheck(strm)) {
|
|
return Z_STREAM_ERROR;
|
|
}
|
|
|
|
strm->total_in = strm->total_out = 0;
|
|
strm->msg = Z_NULL;
|
|
strm->data_type = Z_UNKNOWN;
|
|
|
|
s = (deflate_state *)strm->state;
|
|
s->pending = 0;
|
|
s->pending_out = s->pending_buf;
|
|
|
|
if (s->wrap < 0) {
|
|
s->wrap = -s->wrap;
|
|
}
|
|
s->status =
|
|
#ifdef GZIP
|
|
s->wrap == 2 ? GZIP_STATE :
|
|
#endif
|
|
s->wrap ? INIT_STATE : BUSY_STATE;
|
|
strm->adler =
|
|
#ifdef GZIP
|
|
s->wrap == 2 ? crc32(0L, Z_NULL, 0) :
|
|
#endif
|
|
adler32(0L, Z_NULL, 0);
|
|
s->last_flush = Z_NO_FLUSH;
|
|
|
|
_tr_init(s);
|
|
|
|
return Z_OK;
|
|
}
|
|
|
|
|
|
int ZEXPORT deflateReset (strm)
|
|
z_streamp strm;
|
|
{
|
|
int ret;
|
|
|
|
ret = deflateResetKeep(strm);
|
|
if (ret == Z_OK)
|
|
lm_init(strm->state);
|
|
return ret;
|
|
}
|
|
|
|
|
|
int ZEXPORT deflateSetHeader (strm, head)
|
|
z_streamp strm;
|
|
gz_headerp head;
|
|
{
|
|
if (deflateStateCheck(strm) || strm->state->wrap != 2)
|
|
return Z_STREAM_ERROR;
|
|
strm->state->gzhead = head;
|
|
return Z_OK;
|
|
}
|
|
|
|
|
|
int ZEXPORT deflatePending (strm, pending, bits)
|
|
unsigned *pending;
|
|
int *bits;
|
|
z_streamp strm;
|
|
{
|
|
if (deflateStateCheck(strm)) return Z_STREAM_ERROR;
|
|
if (pending != Z_NULL)
|
|
*pending = strm->state->pending;
|
|
if (bits != Z_NULL)
|
|
*bits = strm->state->bi_valid;
|
|
return Z_OK;
|
|
}
|
|
|
|
|
|
int ZEXPORT deflatePrime (strm, bits, value)
|
|
z_streamp strm;
|
|
int bits;
|
|
int value;
|
|
{
|
|
deflate_state *s;
|
|
int put;
|
|
|
|
if (deflateStateCheck(strm)) return Z_STREAM_ERROR;
|
|
s = strm->state;
|
|
if ((Bytef *)(s->d_buf) < s->pending_out + ((Buf_size + 7) >> 3))
|
|
return Z_BUF_ERROR;
|
|
do {
|
|
put = Buf_size - s->bi_valid;
|
|
if (put > bits)
|
|
put = bits;
|
|
s->bi_buf |= (ush)((value & ((1 << put) - 1)) << s->bi_valid);
|
|
s->bi_valid += put;
|
|
_tr_flush_bits(s);
|
|
value >>= put;
|
|
bits -= put;
|
|
} while (bits);
|
|
return Z_OK;
|
|
}
|
|
|
|
|
|
int ZEXPORT deflateParams(strm, level, strategy)
|
|
z_streamp strm;
|
|
int level;
|
|
int strategy;
|
|
{
|
|
deflate_state *s;
|
|
compress_func func;
|
|
|
|
if (deflateStateCheck(strm)) return Z_STREAM_ERROR;
|
|
s = strm->state;
|
|
|
|
#ifdef FASTEST
|
|
if (level != 0) level = 1;
|
|
#else
|
|
if (level == Z_DEFAULT_COMPRESSION) level = 6;
|
|
#endif
|
|
if (level < 0 || level > 9 || strategy < 0 || strategy > Z_FIXED) {
|
|
return Z_STREAM_ERROR;
|
|
}
|
|
func = configuration_table[s->level].func;
|
|
|
|
if ((strategy != s->strategy || func != configuration_table[level].func) &&
|
|
s->high_water) {
|
|
|
|
int err = deflate(strm, Z_BLOCK);
|
|
if (err == Z_STREAM_ERROR)
|
|
return err;
|
|
if (strm->avail_out == 0)
|
|
return Z_BUF_ERROR;
|
|
}
|
|
if (s->level != level) {
|
|
if (s->level == 0 && s->matches != 0) {
|
|
if (s->matches == 1)
|
|
slide_hash(s);
|
|
else
|
|
CLEAR_HASH(s);
|
|
s->matches = 0;
|
|
}
|
|
s->level = level;
|
|
s->max_lazy_match = configuration_table[level].max_lazy;
|
|
s->good_match = configuration_table[level].good_length;
|
|
s->nice_match = configuration_table[level].nice_length;
|
|
s->max_chain_length = configuration_table[level].max_chain;
|
|
}
|
|
s->strategy = strategy;
|
|
return Z_OK;
|
|
}
|
|
|
|
|
|
int ZEXPORT deflateTune(strm, good_length, max_lazy, nice_length, max_chain)
|
|
z_streamp strm;
|
|
int good_length;
|
|
int max_lazy;
|
|
int nice_length;
|
|
int max_chain;
|
|
{
|
|
deflate_state *s;
|
|
|
|
if (deflateStateCheck(strm)) return Z_STREAM_ERROR;
|
|
s = strm->state;
|
|
s->good_match = (uInt)good_length;
|
|
s->max_lazy_match = (uInt)max_lazy;
|
|
s->nice_match = nice_length;
|
|
s->max_chain_length = (uInt)max_chain;
|
|
return Z_OK;
|
|
}
|
|
|
|
|
|
uLong ZEXPORT deflateBound(strm, sourceLen)
|
|
z_streamp strm;
|
|
uLong sourceLen;
|
|
{
|
|
deflate_state *s;
|
|
uLong complen, wraplen;
|
|
|
|
|
|
complen = sourceLen +
|
|
((sourceLen + 7) >> 3) + ((sourceLen + 63) >> 6) + 5;
|
|
|
|
|
|
if (deflateStateCheck(strm))
|
|
return complen + 6;
|
|
|
|
|
|
s = strm->state;
|
|
switch (s->wrap) {
|
|
case 0:
|
|
wraplen = 0;
|
|
break;
|
|
case 1:
|
|
wraplen = 6 + (s->strstart ? 4 : 0);
|
|
break;
|
|
#ifdef GZIP
|
|
case 2:
|
|
wraplen = 18;
|
|
if (s->gzhead != Z_NULL) {
|
|
Bytef *str;
|
|
if (s->gzhead->extra != Z_NULL)
|
|
wraplen += 2 + s->gzhead->extra_len;
|
|
str = s->gzhead->name;
|
|
if (str != Z_NULL)
|
|
do {
|
|
wraplen++;
|
|
} while (*str++);
|
|
str = s->gzhead->comment;
|
|
if (str != Z_NULL)
|
|
do {
|
|
wraplen++;
|
|
} while (*str++);
|
|
if (s->gzhead->hcrc)
|
|
wraplen += 2;
|
|
}
|
|
break;
|
|
#endif
|
|
default:
|
|
wraplen = 6;
|
|
}
|
|
|
|
|
|
if (s->w_bits != 15 || s->hash_bits != 8 + 7)
|
|
return complen + wraplen;
|
|
|
|
|
|
return sourceLen + (sourceLen >> 12) + (sourceLen >> 14) +
|
|
(sourceLen >> 25) + 13 - 6 + wraplen;
|
|
}
|
|
|
|
|
|
local void putShortMSB (s, b)
|
|
deflate_state *s;
|
|
uInt b;
|
|
{
|
|
put_byte(s, (Byte)(b >> 8));
|
|
put_byte(s, (Byte)(b & 0xff));
|
|
}
|
|
|
|
|
|
local void flush_pending(strm)
|
|
z_streamp strm;
|
|
{
|
|
unsigned len;
|
|
deflate_state *s = strm->state;
|
|
|
|
_tr_flush_bits(s);
|
|
len = s->pending;
|
|
if (len > strm->avail_out) len = strm->avail_out;
|
|
if (len == 0) return;
|
|
|
|
zmemcpy(strm->next_out, s->pending_out, len);
|
|
strm->next_out += len;
|
|
s->pending_out += len;
|
|
strm->total_out += len;
|
|
strm->avail_out -= len;
|
|
s->pending -= len;
|
|
if (s->pending == 0) {
|
|
s->pending_out = s->pending_buf;
|
|
}
|
|
}
|
|
|
|
|
|
#define HCRC_UPDATE(beg) \
|
|
do { \
|
|
if (s->gzhead->hcrc && s->pending > (beg)) \
|
|
strm->adler = crc32(strm->adler, s->pending_buf + (beg), \
|
|
s->pending - (beg)); \
|
|
} while (0)
|
|
|
|
|
|
int ZEXPORT deflate (strm, flush)
|
|
z_streamp strm;
|
|
int flush;
|
|
{
|
|
int old_flush;
|
|
deflate_state *s;
|
|
|
|
if (deflateStateCheck(strm) || flush > Z_BLOCK || flush < 0) {
|
|
return Z_STREAM_ERROR;
|
|
}
|
|
s = strm->state;
|
|
|
|
if (strm->next_out == Z_NULL ||
|
|
(strm->avail_in != 0 && strm->next_in == Z_NULL) ||
|
|
(s->status == FINISH_STATE && flush != Z_FINISH)) {
|
|
ERR_RETURN(strm, Z_STREAM_ERROR);
|
|
}
|
|
if (strm->avail_out == 0) ERR_RETURN(strm, Z_BUF_ERROR);
|
|
|
|
old_flush = s->last_flush;
|
|
s->last_flush = flush;
|
|
|
|
|
|
if (s->pending != 0) {
|
|
flush_pending(strm);
|
|
if (strm->avail_out == 0) {
|
|
|
|
s->last_flush = -1;
|
|
return Z_OK;
|
|
}
|
|
|
|
|
|
} else if (strm->avail_in == 0 && RANK(flush) <= RANK(old_flush) &&
|
|
flush != Z_FINISH) {
|
|
ERR_RETURN(strm, Z_BUF_ERROR);
|
|
}
|
|
|
|
|
|
if (s->status == FINISH_STATE && strm->avail_in != 0) {
|
|
ERR_RETURN(strm, Z_BUF_ERROR);
|
|
}
|
|
|
|
|
|
if (s->status == INIT_STATE) {
|
|
|
|
uInt header = (Z_DEFLATED + ((s->w_bits-8)<<4)) << 8;
|
|
uInt level_flags;
|
|
|
|
if (s->strategy >= Z_HUFFMAN_ONLY || s->level < 2)
|
|
level_flags = 0;
|
|
else if (s->level < 6)
|
|
level_flags = 1;
|
|
else if (s->level == 6)
|
|
level_flags = 2;
|
|
else
|
|
level_flags = 3;
|
|
header |= (level_flags << 6);
|
|
if (s->strstart != 0) header |= PRESET_DICT;
|
|
header += 31 - (header % 31);
|
|
|
|
putShortMSB(s, header);
|
|
|
|
|
|
if (s->strstart != 0) {
|
|
putShortMSB(s, (uInt)(strm->adler >> 16));
|
|
putShortMSB(s, (uInt)(strm->adler & 0xffff));
|
|
}
|
|
strm->adler = adler32(0L, Z_NULL, 0);
|
|
s->status = BUSY_STATE;
|
|
|
|
|
|
flush_pending(strm);
|
|
if (s->pending != 0) {
|
|
s->last_flush = -1;
|
|
return Z_OK;
|
|
}
|
|
}
|
|
#ifdef GZIP
|
|
if (s->status == GZIP_STATE) {
|
|
|
|
strm->adler = crc32(0L, Z_NULL, 0);
|
|
put_byte(s, 31);
|
|
put_byte(s, 139);
|
|
put_byte(s, 8);
|
|
if (s->gzhead == Z_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;
|
|
|
|
|
|
flush_pending(strm);
|
|
if (s->pending != 0) {
|
|
s->last_flush = -1;
|
|
return Z_OK;
|
|
}
|
|
}
|
|
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, (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));
|
|
put_byte(s, s->gzhead->os & 0xff);
|
|
if (s->gzhead->extra != Z_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;
|
|
}
|
|
}
|
|
if (s->status == EXTRA_STATE) {
|
|
if (s->gzhead->extra != Z_NULL) {
|
|
ulg beg = s->pending;
|
|
uInt left = (s->gzhead->extra_len & 0xffff) - s->gzindex;
|
|
while (s->pending + left > s->pending_buf_size) {
|
|
uInt copy = s->pending_buf_size - s->pending;
|
|
zmemcpy(s->pending_buf + s->pending,
|
|
s->gzhead->extra + s->gzindex, copy);
|
|
s->pending = s->pending_buf_size;
|
|
HCRC_UPDATE(beg);
|
|
s->gzindex += copy;
|
|
flush_pending(strm);
|
|
if (s->pending != 0) {
|
|
s->last_flush = -1;
|
|
return Z_OK;
|
|
}
|
|
beg = 0;
|
|
left -= copy;
|
|
}
|
|
zmemcpy(s->pending_buf + s->pending,
|
|
s->gzhead->extra + s->gzindex, left);
|
|
s->pending += left;
|
|
HCRC_UPDATE(beg);
|
|
s->gzindex = 0;
|
|
}
|
|
s->status = NAME_STATE;
|
|
}
|
|
if (s->status == NAME_STATE) {
|
|
if (s->gzhead->name != Z_NULL) {
|
|
ulg beg = s->pending;
|
|
int val;
|
|
do {
|
|
if (s->pending == s->pending_buf_size) {
|
|
HCRC_UPDATE(beg);
|
|
flush_pending(strm);
|
|
if (s->pending != 0) {
|
|
s->last_flush = -1;
|
|
return Z_OK;
|
|
}
|
|
beg = 0;
|
|
}
|
|
val = s->gzhead->name[s->gzindex++];
|
|
put_byte(s, val);
|
|
} while (val != 0);
|
|
HCRC_UPDATE(beg);
|
|
s->gzindex = 0;
|
|
}
|
|
s->status = COMMENT_STATE;
|
|
}
|
|
if (s->status == COMMENT_STATE) {
|
|
if (s->gzhead->comment != Z_NULL) {
|
|
ulg beg = s->pending;
|
|
int val;
|
|
do {
|
|
if (s->pending == s->pending_buf_size) {
|
|
HCRC_UPDATE(beg);
|
|
flush_pending(strm);
|
|
if (s->pending != 0) {
|
|
s->last_flush = -1;
|
|
return Z_OK;
|
|
}
|
|
beg = 0;
|
|
}
|
|
val = s->gzhead->comment[s->gzindex++];
|
|
put_byte(s, val);
|
|
} while (val != 0);
|
|
HCRC_UPDATE(beg);
|
|
}
|
|
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 != 0) {
|
|
s->last_flush = -1;
|
|
return Z_OK;
|
|
}
|
|
}
|
|
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;
|
|
|
|
|
|
flush_pending(strm);
|
|
if (s->pending != 0) {
|
|
s->last_flush = -1;
|
|
return Z_OK;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
|
|
if (strm->avail_in != 0 || s->lookahead != 0 ||
|
|
(flush != Z_NO_FLUSH && s->status != FINISH_STATE)) {
|
|
block_state bstate;
|
|
|
|
bstate = s->level == 0 ? deflate_stored(s, flush) :
|
|
s->strategy == Z_HUFFMAN_ONLY ? deflate_huff(s, flush) :
|
|
s->strategy == Z_RLE ? deflate_rle(s, flush) :
|
|
(*(configuration_table[s->level].func))(s, flush);
|
|
|
|
if (bstate == finish_started || bstate == finish_done) {
|
|
s->status = FINISH_STATE;
|
|
}
|
|
if (bstate == need_more || bstate == finish_started) {
|
|
if (strm->avail_out == 0) {
|
|
s->last_flush = -1;
|
|
}
|
|
return Z_OK;
|
|
|
|
}
|
|
if (bstate == block_done) {
|
|
if (flush == Z_PARTIAL_FLUSH) {
|
|
_tr_align(s);
|
|
} else if (flush != Z_BLOCK) {
|
|
_tr_stored_block(s, (char*)0, 0L, 0);
|
|
|
|
if (flush == Z_FULL_FLUSH) {
|
|
CLEAR_HASH(s);
|
|
if (s->lookahead == 0) {
|
|
s->strstart = 0;
|
|
s->block_start = 0L;
|
|
s->insert = 0;
|
|
}
|
|
}
|
|
}
|
|
flush_pending(strm);
|
|
if (strm->avail_out == 0) {
|
|
s->last_flush = -1;
|
|
return Z_OK;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (flush != Z_FINISH) return Z_OK;
|
|
if (s->wrap <= 0) return Z_STREAM_END;
|
|
|
|
|
|
#ifdef GZIP
|
|
if (s->wrap == 2) {
|
|
put_byte(s, (Byte)(strm->adler & 0xff));
|
|
put_byte(s, (Byte)((strm->adler >> 8) & 0xff));
|
|
put_byte(s, (Byte)((strm->adler >> 16) & 0xff));
|
|
put_byte(s, (Byte)((strm->adler >> 24) & 0xff));
|
|
put_byte(s, (Byte)(strm->total_in & 0xff));
|
|
put_byte(s, (Byte)((strm->total_in >> 8) & 0xff));
|
|
put_byte(s, (Byte)((strm->total_in >> 16) & 0xff));
|
|
put_byte(s, (Byte)((strm->total_in >> 24) & 0xff));
|
|
}
|
|
else
|
|
#endif
|
|
{
|
|
putShortMSB(s, (uInt)(strm->adler >> 16));
|
|
putShortMSB(s, (uInt)(strm->adler & 0xffff));
|
|
}
|
|
flush_pending(strm);
|
|
|
|
if (s->wrap > 0) s->wrap = -s->wrap;
|
|
return s->pending != 0 ? Z_OK : Z_STREAM_END;
|
|
}
|
|
|
|
|
|
int ZEXPORT deflateEnd (strm)
|
|
z_streamp strm;
|
|
{
|
|
int status;
|
|
|
|
if (deflateStateCheck(strm)) return Z_STREAM_ERROR;
|
|
|
|
status = strm->state->status;
|
|
|
|
|
|
TRY_FREE(strm, strm->state->pending_buf);
|
|
TRY_FREE(strm, strm->state->head);
|
|
TRY_FREE(strm, strm->state->prev);
|
|
TRY_FREE(strm, strm->state->window);
|
|
|
|
ZFREE(strm, strm->state);
|
|
strm->state = Z_NULL;
|
|
|
|
return status == BUSY_STATE ? Z_DATA_ERROR : Z_OK;
|
|
}
|
|
|
|
|
|
int ZEXPORT deflateCopy (dest, source)
|
|
z_streamp dest;
|
|
z_streamp source;
|
|
{
|
|
#ifdef MAXSEG_64K
|
|
return Z_STREAM_ERROR;
|
|
#else
|
|
deflate_state *ds;
|
|
deflate_state *ss;
|
|
ushf *overlay;
|
|
|
|
|
|
if (deflateStateCheck(source) || dest == Z_NULL) {
|
|
return Z_STREAM_ERROR;
|
|
}
|
|
|
|
ss = source->state;
|
|
|
|
zmemcpy((voidpf)dest, (voidpf)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;
|
|
zmemcpy((voidpf)ds, (voidpf)ss, sizeof(deflate_state));
|
|
ds->strm = dest;
|
|
|
|
ds->window = (Bytef *) ZALLOC(dest, ds->w_size, 2*sizeof(Byte));
|
|
ds->prev = (Posf *) ZALLOC(dest, ds->w_size, sizeof(Pos));
|
|
ds->head = (Posf *) ZALLOC(dest, ds->hash_size, sizeof(Pos));
|
|
overlay = (ushf *) ZALLOC(dest, ds->lit_bufsize, sizeof(ush)+2);
|
|
ds->pending_buf = (uchf *) overlay;
|
|
|
|
if (ds->window == Z_NULL || ds->prev == Z_NULL || ds->head == Z_NULL ||
|
|
ds->pending_buf == Z_NULL) {
|
|
deflateEnd (dest);
|
|
return Z_MEM_ERROR;
|
|
}
|
|
|
|
zmemcpy(ds->window, ss->window, ds->w_size * 2 * sizeof(Byte));
|
|
zmemcpy((voidpf)ds->prev, (voidpf)ss->prev, ds->w_size * sizeof(Pos));
|
|
zmemcpy((voidpf)ds->head, (voidpf)ss->head, ds->hash_size * sizeof(Pos));
|
|
zmemcpy(ds->pending_buf, ss->pending_buf, (uInt)ds->pending_buf_size);
|
|
|
|
ds->pending_out = ds->pending_buf + (ss->pending_out - ss->pending_buf);
|
|
ds->d_buf = overlay + ds->lit_bufsize/sizeof(ush);
|
|
ds->l_buf = ds->pending_buf + (1+sizeof(ush))*ds->lit_bufsize;
|
|
|
|
ds->l_desc.dyn_tree = ds->dyn_ltree;
|
|
ds->d_desc.dyn_tree = ds->dyn_dtree;
|
|
ds->bl_desc.dyn_tree = ds->bl_tree;
|
|
|
|
return Z_OK;
|
|
#endif
|
|
}
|
|
|
|
|
|
local unsigned read_buf(strm, buf, size)
|
|
z_streamp strm;
|
|
Bytef *buf;
|
|
unsigned size;
|
|
{
|
|
unsigned len = strm->avail_in;
|
|
|
|
if (len > size) len = size;
|
|
if (len == 0) return 0;
|
|
|
|
strm->avail_in -= len;
|
|
|
|
zmemcpy(buf, strm->next_in, len);
|
|
if (strm->state->wrap == 1) {
|
|
strm->adler = adler32(strm->adler, buf, len);
|
|
}
|
|
#ifdef GZIP
|
|
else if (strm->state->wrap == 2) {
|
|
strm->adler = crc32(strm->adler, buf, len);
|
|
}
|
|
#endif
|
|
strm->next_in += len;
|
|
strm->total_in += len;
|
|
|
|
return len;
|
|
}
|
|
|
|
|
|
local void lm_init (s)
|
|
deflate_state *s;
|
|
{
|
|
s->window_size = (ulg)2L*s->w_size;
|
|
|
|
CLEAR_HASH(s);
|
|
|
|
|
|
s->max_lazy_match = configuration_table[s->level].max_lazy;
|
|
s->good_match = configuration_table[s->level].good_length;
|
|
s->nice_match = configuration_table[s->level].nice_length;
|
|
s->max_chain_length = configuration_table[s->level].max_chain;
|
|
|
|
s->strstart = 0;
|
|
s->block_start = 0L;
|
|
s->lookahead = 0;
|
|
s->insert = 0;
|
|
s->match_length = s->prev_length = MIN_MATCH-1;
|
|
s->match_available = 0;
|
|
s->ins_h = 0;
|
|
#ifndef FASTEST
|
|
#ifdef ASMV
|
|
match_init();
|
|
#endif
|
|
#endif
|
|
}
|
|
|
|
#ifndef FASTEST
|
|
|
|
#ifndef ASMV
|
|
|
|
local uInt longest_match(s, cur_match)
|
|
deflate_state *s;
|
|
IPos cur_match;
|
|
{
|
|
unsigned chain_length = s->max_chain_length;
|
|
register Bytef *scan = s->window + s->strstart;
|
|
register Bytef *match;
|
|
register int len;
|
|
int best_len = (int)s->prev_length;
|
|
int nice_match = s->nice_match;
|
|
IPos limit = s->strstart > (IPos)MAX_DIST(s) ?
|
|
s->strstart - (IPos)MAX_DIST(s) : NIL;
|
|
|
|
Posf *prev = s->prev;
|
|
uInt wmask = s->w_mask;
|
|
|
|
#ifdef UNALIGNED_OK
|
|
|
|
register Bytef *strend = s->window + s->strstart + MAX_MATCH - 1;
|
|
register ush scan_start = *(ushf*)scan;
|
|
register ush scan_end = *(ushf*)(scan+best_len-1);
|
|
#else
|
|
register Bytef *strend = s->window + s->strstart + MAX_MATCH;
|
|
register Byte scan_end1 = scan[best_len-1];
|
|
register Byte scan_end = scan[best_len];
|
|
#endif
|
|
|
|
|
|
Assert(s->hash_bits >= 8 && MAX_MATCH == 258, "Code too clever");
|
|
|
|
|
|
if (s->prev_length >= s->good_match) {
|
|
chain_length >>= 2;
|
|
}
|
|
|
|
if ((uInt)nice_match > s->lookahead) nice_match = (int)s->lookahead;
|
|
|
|
Assert((ulg)s->strstart <= s->window_size-MIN_LOOKAHEAD, "need lookahead");
|
|
|
|
do {
|
|
Assert(cur_match < s->strstart, "no future");
|
|
match = s->window + cur_match;
|
|
|
|
|
|
#if (defined(UNALIGNED_OK) && MAX_MATCH == 258)
|
|
|
|
if (*(ushf*)(match+best_len-1) != scan_end ||
|
|
*(ushf*)match != scan_start) continue;
|
|
|
|
|
|
Assert(scan[2] == match[2], "scan[2]?");
|
|
scan++, match++;
|
|
do {
|
|
} while (*(ushf*)(scan+=2) == *(ushf*)(match+=2) &&
|
|
*(ushf*)(scan+=2) == *(ushf*)(match+=2) &&
|
|
*(ushf*)(scan+=2) == *(ushf*)(match+=2) &&
|
|
*(ushf*)(scan+=2) == *(ushf*)(match+=2) &&
|
|
scan < strend);
|
|
|
|
|
|
|
|
Assert(scan <= s->window+(unsigned)(s->window_size-1), "wild scan");
|
|
if (*scan == *match) scan++;
|
|
|
|
len = (MAX_MATCH - 1) - (int)(strend-scan);
|
|
scan = strend - (MAX_MATCH-1);
|
|
|
|
#else
|
|
|
|
if (match[best_len] != scan_end ||
|
|
match[best_len-1] != scan_end1 ||
|
|
*match != *scan ||
|
|
*++match != scan[1]) continue;
|
|
|
|
|
|
scan += 2, match++;
|
|
Assert(*scan == *match, "match[2]?");
|
|
|
|
|
|
do {
|
|
} while (*++scan == *++match && *++scan == *++match &&
|
|
*++scan == *++match && *++scan == *++match &&
|
|
*++scan == *++match && *++scan == *++match &&
|
|
*++scan == *++match && *++scan == *++match &&
|
|
scan < strend);
|
|
|
|
Assert(scan <= s->window+(unsigned)(s->window_size-1), "wild scan");
|
|
|
|
len = MAX_MATCH - (int)(strend - scan);
|
|
scan = strend - MAX_MATCH;
|
|
|
|
#endif
|
|
|
|
if (len > best_len) {
|
|
s->match_start = cur_match;
|
|
best_len = len;
|
|
if (len >= nice_match) break;
|
|
#ifdef UNALIGNED_OK
|
|
scan_end = *(ushf*)(scan+best_len-1);
|
|
#else
|
|
scan_end1 = scan[best_len-1];
|
|
scan_end = scan[best_len];
|
|
#endif
|
|
}
|
|
} while ((cur_match = prev[cur_match & wmask]) > limit
|
|
&& --chain_length != 0);
|
|
|
|
if ((uInt)best_len <= s->lookahead) return (uInt)best_len;
|
|
return s->lookahead;
|
|
}
|
|
#endif
|
|
|
|
#else
|
|
|
|
|
|
local uInt longest_match(s, cur_match)
|
|
deflate_state *s;
|
|
IPos cur_match;
|
|
{
|
|
register Bytef *scan = s->window + s->strstart;
|
|
register Bytef *match;
|
|
register int len;
|
|
register Bytef *strend = s->window + s->strstart + MAX_MATCH;
|
|
|
|
|
|
Assert(s->hash_bits >= 8 && MAX_MATCH == 258, "Code too clever");
|
|
|
|
Assert((ulg)s->strstart <= s->window_size-MIN_LOOKAHEAD, "need lookahead");
|
|
|
|
Assert(cur_match < s->strstart, "no future");
|
|
|
|
match = s->window + cur_match;
|
|
|
|
|
|
if (match[0] != scan[0] || match[1] != scan[1]) return MIN_MATCH-1;
|
|
|
|
|
|
scan += 2, match += 2;
|
|
Assert(*scan == *match, "match[2]?");
|
|
|
|
|
|
do {
|
|
} while (*++scan == *++match && *++scan == *++match &&
|
|
*++scan == *++match && *++scan == *++match &&
|
|
*++scan == *++match && *++scan == *++match &&
|
|
*++scan == *++match && *++scan == *++match &&
|
|
scan < strend);
|
|
|
|
Assert(scan <= s->window+(unsigned)(s->window_size-1), "wild scan");
|
|
|
|
len = MAX_MATCH - (int)(strend - scan);
|
|
|
|
if (len < MIN_MATCH) return MIN_MATCH - 1;
|
|
|
|
s->match_start = cur_match;
|
|
return (uInt)len <= s->lookahead ? (uInt)len : s->lookahead;
|
|
}
|
|
|
|
#endif
|
|
|
|
#ifdef ZLIB_DEBUG
|
|
|
|
#define EQUAL 0
|
|
|
|
|
|
|
|
local void check_match(s, start, match, length)
|
|
deflate_state *s;
|
|
IPos start, match;
|
|
int length;
|
|
{
|
|
|
|
if (zmemcmp(s->window + match,
|
|
s->window + start, length) != EQUAL) {
|
|
fprintf(stderr, " start %u, match %u, length %d\n",
|
|
start, match, length);
|
|
do {
|
|
fprintf(stderr, "%c%c", s->window[match++], s->window[start++]);
|
|
} while (--length != 0);
|
|
z_error("invalid match");
|
|
}
|
|
if (z_verbose > 1) {
|
|
fprintf(stderr,"\\[%d,%d]", start-match, length);
|
|
do { putc(s->window[start++], stderr); } while (--length != 0);
|
|
}
|
|
}
|
|
#else
|
|
# define check_match(s, start, match, length)
|
|
#endif
|
|
|
|
|
|
local void fill_window(s)
|
|
deflate_state *s;
|
|
{
|
|
unsigned n;
|
|
unsigned more;
|
|
uInt wsize = s->w_size;
|
|
|
|
Assert(s->lookahead < MIN_LOOKAHEAD, "already enough lookahead");
|
|
|
|
do {
|
|
more = (unsigned)(s->window_size -(ulg)s->lookahead -(ulg)s->strstart);
|
|
|
|
|
|
if (sizeof(int) <= 2) {
|
|
if (more == 0 && s->strstart == 0 && s->lookahead == 0) {
|
|
more = wsize;
|
|
|
|
} else if (more == (unsigned)(-1)) {
|
|
|
|
more--;
|
|
}
|
|
}
|
|
|
|
|
|
if (s->strstart >= wsize+MAX_DIST(s)) {
|
|
|
|
zmemcpy(s->window, s->window+wsize, (unsigned)wsize - more);
|
|
s->match_start -= wsize;
|
|
s->strstart -= wsize;
|
|
s->block_start -= (long) wsize;
|
|
slide_hash(s);
|
|
more += wsize;
|
|
}
|
|
if (s->strm->avail_in == 0) break;
|
|
|
|
|
|
Assert(more >= 2, "more < 2");
|
|
|
|
n = read_buf(s->strm, s->window + s->strstart + s->lookahead, more);
|
|
s->lookahead += n;
|
|
|
|
|
|
if (s->lookahead + s->insert >= MIN_MATCH) {
|
|
uInt str = s->strstart - s->insert;
|
|
s->ins_h = s->window[str];
|
|
UPDATE_HASH(s, s->ins_h, s->window[str + 1]);
|
|
#if MIN_MATCH != 3
|
|
Call UPDATE_HASH() MIN_MATCH-3 more times
|
|
#endif
|
|
while (s->insert) {
|
|
UPDATE_HASH(s, s->ins_h, s->window[str + MIN_MATCH-1]);
|
|
#ifndef FASTEST
|
|
s->prev[str & s->w_mask] = s->head[s->ins_h];
|
|
#endif
|
|
s->head[s->ins_h] = (Pos)str;
|
|
str++;
|
|
s->insert--;
|
|
if (s->lookahead + s->insert < MIN_MATCH)
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
} while (s->lookahead < MIN_LOOKAHEAD && s->strm->avail_in != 0);
|
|
|
|
|
|
if (s->high_water < s->window_size) {
|
|
ulg curr = s->strstart + (ulg)(s->lookahead);
|
|
ulg init;
|
|
|
|
if (s->high_water < curr) {
|
|
|
|
init = s->window_size - curr;
|
|
if (init > WIN_INIT)
|
|
init = WIN_INIT;
|
|
zmemzero(s->window + curr, (unsigned)init);
|
|
s->high_water = curr + init;
|
|
}
|
|
else if (s->high_water < (ulg)curr + WIN_INIT) {
|
|
|
|
init = (ulg)curr + WIN_INIT - s->high_water;
|
|
if (init > s->window_size - s->high_water)
|
|
init = s->window_size - s->high_water;
|
|
zmemzero(s->window + s->high_water, (unsigned)init);
|
|
s->high_water += init;
|
|
}
|
|
}
|
|
|
|
Assert((ulg)s->strstart <= s->window_size - MIN_LOOKAHEAD,
|
|
"not enough room for search");
|
|
}
|
|
|
|
|
|
#define FLUSH_BLOCK_ONLY(s, last) { \
|
|
_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), \
|
|
(last)); \
|
|
s->block_start = s->strstart; \
|
|
flush_pending(s->strm); \
|
|
Tracev((stderr,"[FLUSH]")); \
|
|
}
|
|
|
|
|
|
#define FLUSH_BLOCK(s, last) { \
|
|
FLUSH_BLOCK_ONLY(s, last); \
|
|
if (s->strm->avail_out == 0) return (last) ? finish_started : need_more; \
|
|
}
|
|
|
|
|
|
#define MAX_STORED 65535
|
|
|
|
|
|
#define MIN(a, b) ((a) > (b) ? (b) : (a))
|
|
|
|
|
|
local block_state deflate_stored(s, flush)
|
|
deflate_state *s;
|
|
int flush;
|
|
{
|
|
|
|
unsigned min_block = MIN(s->pending_buf_size - 5, s->w_size);
|
|
|
|
|
|
unsigned len, left, have, last = 0;
|
|
unsigned used = s->strm->avail_in;
|
|
do {
|
|
|
|
len = MAX_STORED;
|
|
have = (s->bi_valid + 42) >> 3;
|
|
if (s->strm->avail_out < have)
|
|
break;
|
|
|
|
have = s->strm->avail_out - have;
|
|
left = s->strstart - s->block_start;
|
|
if (len > (ulg)left + s->strm->avail_in)
|
|
len = left + s->strm->avail_in;
|
|
if (len > have)
|
|
len = have;
|
|
|
|
|
|
if (len < min_block && ((len == 0 && flush != Z_FINISH) ||
|
|
flush == Z_NO_FLUSH ||
|
|
len != left + s->strm->avail_in))
|
|
break;
|
|
|
|
|
|
last = flush == Z_FINISH && len == left + s->strm->avail_in ? 1 : 0;
|
|
_tr_stored_block(s, (char *)0, 0L, last);
|
|
|
|
|
|
s->pending_buf[s->pending - 4] = len;
|
|
s->pending_buf[s->pending - 3] = len >> 8;
|
|
s->pending_buf[s->pending - 2] = ~len;
|
|
s->pending_buf[s->pending - 1] = ~len >> 8;
|
|
|
|
|
|
flush_pending(s->strm);
|
|
|
|
#ifdef ZLIB_DEBUG
|
|
|
|
s->compressed_len += len << 3;
|
|
s->bits_sent += len << 3;
|
|
#endif
|
|
|
|
|
|
if (left) {
|
|
if (left > len)
|
|
left = len;
|
|
zmemcpy(s->strm->next_out, s->window + s->block_start, left);
|
|
s->strm->next_out += left;
|
|
s->strm->avail_out -= left;
|
|
s->strm->total_out += left;
|
|
s->block_start += left;
|
|
len -= left;
|
|
}
|
|
|
|
|
|
if (len) {
|
|
read_buf(s->strm, s->strm->next_out, len);
|
|
s->strm->next_out += len;
|
|
s->strm->avail_out -= len;
|
|
s->strm->total_out += len;
|
|
}
|
|
} while (last == 0);
|
|
|
|
|
|
used -= s->strm->avail_in;
|
|
if (used) {
|
|
|
|
if (used >= s->w_size) {
|
|
s->matches = 2;
|
|
zmemcpy(s->window, s->strm->next_in - s->w_size, s->w_size);
|
|
s->strstart = s->w_size;
|
|
}
|
|
else {
|
|
if (s->window_size - s->strstart <= used) {
|
|
|
|
s->strstart -= s->w_size;
|
|
zmemcpy(s->window, s->window + s->w_size, s->strstart);
|
|
if (s->matches < 2)
|
|
s->matches++;
|
|
}
|
|
zmemcpy(s->window + s->strstart, s->strm->next_in - used, used);
|
|
s->strstart += used;
|
|
}
|
|
s->block_start = s->strstart;
|
|
s->insert += MIN(used, s->w_size - s->insert);
|
|
}
|
|
if (s->high_water < s->strstart)
|
|
s->high_water = s->strstart;
|
|
|
|
|
|
if (last)
|
|
return finish_done;
|
|
|
|
|
|
if (flush != Z_NO_FLUSH && flush != Z_FINISH &&
|
|
s->strm->avail_in == 0 && (long)s->strstart == s->block_start)
|
|
return block_done;
|
|
|
|
|
|
have = s->window_size - s->strstart - 1;
|
|
if (s->strm->avail_in > have && s->block_start >= (long)s->w_size) {
|
|
|
|
s->block_start -= s->w_size;
|
|
s->strstart -= s->w_size;
|
|
zmemcpy(s->window, s->window + s->w_size, s->strstart);
|
|
if (s->matches < 2)
|
|
s->matches++;
|
|
have += s->w_size;
|
|
}
|
|
if (have > s->strm->avail_in)
|
|
have = s->strm->avail_in;
|
|
if (have) {
|
|
read_buf(s->strm, s->window + s->strstart, have);
|
|
s->strstart += have;
|
|
}
|
|
if (s->high_water < s->strstart)
|
|
s->high_water = s->strstart;
|
|
|
|
|
|
have = (s->bi_valid + 42) >> 3;
|
|
|
|
have = MIN(s->pending_buf_size - have, MAX_STORED);
|
|
min_block = MIN(have, s->w_size);
|
|
left = s->strstart - s->block_start;
|
|
if (left >= min_block ||
|
|
((left || flush == Z_FINISH) && flush != Z_NO_FLUSH &&
|
|
s->strm->avail_in == 0 && left <= have)) {
|
|
len = MIN(left, have);
|
|
last = flush == Z_FINISH && s->strm->avail_in == 0 &&
|
|
len == left ? 1 : 0;
|
|
_tr_stored_block(s, (charf *)s->window + s->block_start, len, last);
|
|
s->block_start += len;
|
|
flush_pending(s->strm);
|
|
}
|
|
|
|
|
|
return last ? finish_started : need_more;
|
|
}
|
|
|
|
|
|
local block_state deflate_fast(s, flush)
|
|
deflate_state *s;
|
|
int flush;
|
|
{
|
|
IPos hash_head;
|
|
int bflush;
|
|
|
|
for (;;) {
|
|
|
|
if (s->lookahead < MIN_LOOKAHEAD) {
|
|
fill_window(s);
|
|
if (s->lookahead < MIN_LOOKAHEAD && flush == Z_NO_FLUSH) {
|
|
return need_more;
|
|
}
|
|
if (s->lookahead == 0) break;
|
|
}
|
|
|
|
|
|
hash_head = NIL;
|
|
if (s->lookahead >= MIN_MATCH) {
|
|
INSERT_STRING(s, s->strstart, hash_head);
|
|
}
|
|
|
|
|
|
if (hash_head != NIL && s->strstart - hash_head <= MAX_DIST(s)) {
|
|
|
|
s->match_length = longest_match (s, hash_head);
|
|
|
|
}
|
|
if (s->match_length >= MIN_MATCH) {
|
|
check_match(s, s->strstart, s->match_start, s->match_length);
|
|
|
|
_tr_tally_dist(s, s->strstart - s->match_start,
|
|
s->match_length - MIN_MATCH, bflush);
|
|
|
|
s->lookahead -= s->match_length;
|
|
|
|
|
|
#ifndef FASTEST
|
|
if (s->match_length <= s->max_insert_length &&
|
|
s->lookahead >= MIN_MATCH) {
|
|
s->match_length--;
|
|
do {
|
|
s->strstart++;
|
|
INSERT_STRING(s, s->strstart, hash_head);
|
|
|
|
} while (--s->match_length != 0);
|
|
s->strstart++;
|
|
} else
|
|
#endif
|
|
{
|
|
s->strstart += s->match_length;
|
|
s->match_length = 0;
|
|
s->ins_h = s->window[s->strstart];
|
|
UPDATE_HASH(s, s->ins_h, s->window[s->strstart+1]);
|
|
#if MIN_MATCH != 3
|
|
Call UPDATE_HASH() MIN_MATCH-3 more times
|
|
#endif
|
|
|
|
}
|
|
} else {
|
|
|
|
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);
|
|
}
|
|
s->insert = s->strstart < MIN_MATCH-1 ? s->strstart : MIN_MATCH-1;
|
|
if (flush == Z_FINISH) {
|
|
FLUSH_BLOCK(s, 1);
|
|
return finish_done;
|
|
}
|
|
if (s->last_lit)
|
|
FLUSH_BLOCK(s, 0);
|
|
return block_done;
|
|
}
|
|
|
|
#ifndef FASTEST
|
|
|
|
local block_state deflate_slow(s, flush)
|
|
deflate_state *s;
|
|
int flush;
|
|
{
|
|
IPos hash_head;
|
|
int bflush;
|
|
|
|
|
|
for (;;) {
|
|
|
|
if (s->lookahead < MIN_LOOKAHEAD) {
|
|
fill_window(s);
|
|
if (s->lookahead < MIN_LOOKAHEAD && flush == Z_NO_FLUSH) {
|
|
return need_more;
|
|
}
|
|
if (s->lookahead == 0) break;
|
|
}
|
|
|
|
|
|
hash_head = NIL;
|
|
if (s->lookahead >= MIN_MATCH) {
|
|
INSERT_STRING(s, s->strstart, hash_head);
|
|
}
|
|
|
|
|
|
s->prev_length = s->match_length, s->prev_match = s->match_start;
|
|
s->match_length = MIN_MATCH-1;
|
|
|
|
if (hash_head != NIL && s->prev_length < s->max_lazy_match &&
|
|
s->strstart - hash_head <= MAX_DIST(s)) {
|
|
|
|
s->match_length = longest_match (s, hash_head);
|
|
|
|
|
|
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
|
|
)) {
|
|
|
|
|
|
s->match_length = MIN_MATCH-1;
|
|
}
|
|
}
|
|
|
|
if (s->prev_length >= MIN_MATCH && s->match_length <= s->prev_length) {
|
|
uInt max_insert = s->strstart + s->lookahead - MIN_MATCH;
|
|
|
|
|
|
check_match(s, s->strstart-1, s->prev_match, s->prev_length);
|
|
|
|
_tr_tally_dist(s, s->strstart -1 - s->prev_match,
|
|
s->prev_length - MIN_MATCH, bflush);
|
|
|
|
|
|
s->lookahead -= s->prev_length-1;
|
|
s->prev_length -= 2;
|
|
do {
|
|
if (++s->strstart <= max_insert) {
|
|
INSERT_STRING(s, s->strstart, hash_head);
|
|
}
|
|
} while (--s->prev_length != 0);
|
|
s->match_available = 0;
|
|
s->match_length = MIN_MATCH-1;
|
|
s->strstart++;
|
|
|
|
if (bflush) FLUSH_BLOCK(s, 0);
|
|
|
|
} else if (s->match_available) {
|
|
|
|
Tracevv((stderr,"%c", s->window[s->strstart-1]));
|
|
_tr_tally_lit(s, s->window[s->strstart-1], bflush);
|
|
if (bflush) {
|
|
FLUSH_BLOCK_ONLY(s, 0);
|
|
}
|
|
s->strstart++;
|
|
s->lookahead--;
|
|
if (s->strm->avail_out == 0) return need_more;
|
|
} else {
|
|
|
|
s->match_available = 1;
|
|
s->strstart++;
|
|
s->lookahead--;
|
|
}
|
|
}
|
|
Assert (flush != Z_NO_FLUSH, "no flush?");
|
|
if (s->match_available) {
|
|
Tracevv((stderr,"%c", s->window[s->strstart-1]));
|
|
_tr_tally_lit(s, s->window[s->strstart-1], bflush);
|
|
s->match_available = 0;
|
|
}
|
|
s->insert = s->strstart < MIN_MATCH-1 ? s->strstart : MIN_MATCH-1;
|
|
if (flush == Z_FINISH) {
|
|
FLUSH_BLOCK(s, 1);
|
|
return finish_done;
|
|
}
|
|
if (s->last_lit)
|
|
FLUSH_BLOCK(s, 0);
|
|
return block_done;
|
|
}
|
|
#endif
|
|
|
|
|
|
local block_state deflate_rle(s, flush)
|
|
deflate_state *s;
|
|
int flush;
|
|
{
|
|
int bflush;
|
|
uInt prev;
|
|
Bytef *scan, *strend;
|
|
|
|
for (;;) {
|
|
|
|
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;
|
|
}
|
|
|
|
|
|
s->match_length = 0;
|
|
if (s->lookahead >= MIN_MATCH && s->strstart > 0) {
|
|
scan = s->window + s->strstart - 1;
|
|
prev = *scan;
|
|
if (prev == *++scan && prev == *++scan && prev == *++scan) {
|
|
strend = s->window + s->strstart + MAX_MATCH;
|
|
do {
|
|
} while (prev == *++scan && prev == *++scan &&
|
|
prev == *++scan && prev == *++scan &&
|
|
prev == *++scan && prev == *++scan &&
|
|
prev == *++scan && prev == *++scan &&
|
|
scan < strend);
|
|
s->match_length = MAX_MATCH - (uInt)(strend - scan);
|
|
if (s->match_length > s->lookahead)
|
|
s->match_length = s->lookahead;
|
|
}
|
|
Assert(scan <= s->window+(uInt)(s->window_size-1), "wild scan");
|
|
}
|
|
|
|
|
|
if (s->match_length >= MIN_MATCH) {
|
|
check_match(s, s->strstart, s->strstart - 1, s->match_length);
|
|
|
|
_tr_tally_dist(s, 1, s->match_length - MIN_MATCH, bflush);
|
|
|
|
s->lookahead -= s->match_length;
|
|
s->strstart += s->match_length;
|
|
s->match_length = 0;
|
|
} else {
|
|
|
|
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);
|
|
}
|
|
s->insert = 0;
|
|
if (flush == Z_FINISH) {
|
|
FLUSH_BLOCK(s, 1);
|
|
return finish_done;
|
|
}
|
|
if (s->last_lit)
|
|
FLUSH_BLOCK(s, 0);
|
|
return block_done;
|
|
}
|
|
|
|
|
|
local block_state deflate_huff(s, flush)
|
|
deflate_state *s;
|
|
int flush;
|
|
{
|
|
int bflush;
|
|
|
|
for (;;) {
|
|
|
|
if (s->lookahead == 0) {
|
|
fill_window(s);
|
|
if (s->lookahead == 0) {
|
|
if (flush == Z_NO_FLUSH)
|
|
return need_more;
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
s->match_length = 0;
|
|
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);
|
|
}
|
|
s->insert = 0;
|
|
if (flush == Z_FINISH) {
|
|
FLUSH_BLOCK(s, 1);
|
|
return finish_done;
|
|
}
|
|
if (s->last_lit)
|
|
FLUSH_BLOCK(s, 0);
|
|
return block_done;
|
|
}
|