ReactOS  0.4.15-dev-1201-gb2cf5a4
Classes | Macros | Enumerations | Functions
inflate.c File Reference
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include "winternl.h"
#include "zlib.h"
Include dependency graph for inflate.c:

Go to the source code of this file.

Classes

struct  code
 
struct  inflate_state
 

Macros

#define DEF_WBITS   MAX_WBITS
 
#define zmemcpy   memcpy
 
#define zmemzero(dest, len)   memset(dest, 0, len)
 
#define Assert(cond, msg)
 
#define Trace(x)
 
#define Tracev(x)
 
#define Tracevv(x)
 
#define Tracecv(c, x)
 
#define GUNZIP
 
#define ZALLOC(strm, items, size)   (*((strm)->zalloc))((strm)->opaque, (items), (size))
 
#define ZFREE(strm, addr)   (*((strm)->zfree))((strm)->opaque, (voidpf)(addr))
 
#define TRY_FREE(s, p)   {if (p) ZFREE(s, p);}
 
#define ZSWAP32(q)
 
#define BASE   65521U /* largest prime smaller than 65536 */
 
#define NMAX   5552
 
#define DO1(buf, i)   {adler += (buf)[i]; sum2 += adler;}
 
#define DO2(buf, i)   DO1(buf,i); DO1(buf,i+1);
 
#define DO4(buf, i)   DO2(buf,i); DO2(buf,i+2);
 
#define DO8(buf, i)   DO4(buf,i); DO4(buf,i+4);
 
#define DO16(buf)   DO8(buf,0); DO8(buf,8);
 
#define MOD(a)   a %= BASE
 
#define MOD28(a)   a %= BASE
 
#define MOD63(a)   a %= BASE
 
#define ENOUGH_LENS   852
 
#define ENOUGH_DISTS   592
 
#define ENOUGH   (ENOUGH_LENS+ENOUGH_DISTS)
 
#define MAXBITS   15
 
#define crc32(crc, buf, len)   RtlComputeCrc32(crc,buf,len)
 
#define UPDATE(check, buf, len)   (state->flags ? crc32(check, buf, len) : adler32(check, buf, len))
 
#define CRC2(check, word)
 
#define CRC4(check, word)
 
#define LOAD()
 
#define RESTORE()
 
#define INITBITS()
 
#define PULLBYTE()
 
#define NEEDBITS(n)
 
#define BITS(n)   ((unsigned)hold & ((1U << (n)) - 1))
 
#define DROPBITS(n)
 
#define BYTEBITS()
 

Enumerations

enum  codetype {
  CODES, LENS, DISTS, CODES,
  LENS, DISTS
}
 
enum  inflate_mode {
  HEAD = 16180, FLAGS, TIME, OS,
  EXLEN, EXTRA, NAME, COMMENT,
  HCRC, DICTID, DICT, TYPE,
  TYPEDO, STORED, COPY_, COPY,
  TABLE, LENLENS, CODELENS, LEN_,
  LEN, LENEXT, DIST, DISTEXT,
  MATCH, LIT, CHECK, LENGTH,
  DONE, BAD, MEM, SYNC,
  METHOD, FLAG, DICT4, DICT3,
  DICT2, DICT1, DICT0, BLOCKS,
  CHECK4, CHECK3, CHECK2, CHECK1,
  DONE, BAD, HEAD = 16180, FLAGS,
  TIME, OS, EXLEN, EXTRA,
  NAME, COMMENT, HCRC, DICTID,
  DICT, TYPE, TYPEDO, STORED,
  COPY_, COPY, TABLE, LENLENS,
  CODELENS, LEN_, LEN, LENEXT,
  DIST, DISTEXT, MATCH, LIT,
  CHECK, LENGTH, DONE, BAD,
  MEM, SYNC
}
 

Functions

static uLong adler32 (uLong adler, const Bytef *buf, uInt len)
 
static void inflate_fast (z_streamp strm, unsigned start)
 
static int inflate_table (codetype type, unsigned short FAR *lens, unsigned codes, code FAR *FAR *table, unsigned FAR *bits, unsigned short FAR *work)
 
static int inflateStateCheck (z_streamp strm)
 
static int inflateResetKeep (z_streamp strm)
 
static int inflateReset (z_streamp strm)
 
static int inflateReset2 (z_streamp strm, int windowBits)
 
int inflateInit2 (z_streamp strm, int windowBits)
 
int inflateInit (z_streamp strm)
 
static void fixedtables (struct inflate_state FAR *state)
 
static int updatewindow (z_streamp strm, const Bytef *end, unsigned copy)
 
int inflate (z_streamp strm, int flush)
 
int inflateEnd (z_streamp strm)
 

Macro Definition Documentation

◆ Assert

#define Assert (   cond,
  msg 
)

Definition at line 41 of file inflate.c.

◆ BASE

#define BASE   65521U /* largest prime smaller than 65536 */

Definition at line 58 of file inflate.c.

◆ BITS

#define BITS (   n)    ((unsigned)hold & ((1U << (n)) - 1))

Definition at line 1158 of file inflate.c.

◆ BYTEBITS

#define BYTEBITS ( )
Value:
do { \
hold >>= bits & 7; \
bits -= bits & 7; \
} while (0)
bits
GLenum GLint GLenum GLsizei GLsizei GLsizei GLint GLsizei const GLvoid * bits
Definition: glext.h:10929

Definition at line 1169 of file inflate.c.

◆ CRC2

#define CRC2 (   check,
  word 
)
Value:
do { \
hbuf[0] = (unsigned char)(word); \
hbuf[1] = (unsigned char)((word) >> 8); \
check = crc32(check, hbuf, 2); \
} while (0)
char
unsigned char
Definition: typeof.h:29
check
void check(CONTEXT *pContext)
Definition: NtContinue.c:68
word
const WCHAR * word
Definition: lex.c:36
crc32
#define crc32(crc, buf, len)
Definition: inflate.c:1081

Definition at line 1093 of file inflate.c.

◆ crc32

#define crc32 (   crc,
  buf,
  len 
)    RtlComputeCrc32(crc,buf,len)

Definition at line 1081 of file inflate.c.

◆ CRC4

#define CRC4 (   check,
  word 
)
Value:
do { \
hbuf[0] = (unsigned char)(word); \
hbuf[1] = (unsigned char)((word) >> 8); \
hbuf[2] = (unsigned char)((word) >> 16); \
hbuf[3] = (unsigned char)((word) >> 24); \
check = crc32(check, hbuf, 4); \
} while (0)
char
unsigned char
Definition: typeof.h:29
check
void check(CONTEXT *pContext)
Definition: NtContinue.c:68
word
const WCHAR * word
Definition: lex.c:36
crc32
#define crc32(crc, buf, len)
Definition: inflate.c:1081

Definition at line 1100 of file inflate.c.

◆ DEF_WBITS

#define DEF_WBITS   MAX_WBITS

Definition at line 37 of file inflate.c.

◆ DO1

#define DO1 (   buf,
  i 
)    {adler += (buf)[i]; sum2 += adler;}

Definition at line 62 of file inflate.c.

◆ DO16

#define DO16 (   buf)    DO8(buf,0); DO8(buf,8);

Definition at line 66 of file inflate.c.

◆ DO2

#define DO2 (   buf,
  i 
)    DO1(buf,i); DO1(buf,i+1);

Definition at line 63 of file inflate.c.

◆ DO4

#define DO4 (   buf,
  i 
)    DO2(buf,i); DO2(buf,i+2);

Definition at line 64 of file inflate.c.

◆ DO8

#define DO8 (   buf,
  i 
)    DO4(buf,i); DO4(buf,i+4);

Definition at line 65 of file inflate.c.

◆ DROPBITS

#define DROPBITS (   n)
Value:
do { \
hold >>= (n); \
bits -= (unsigned)(n); \
} while (0)
n
GLdouble n
Definition: glext.h:7729
unsigned
static unsigned(__cdecl *hash_bstr)(bstr_t s)

Definition at line 1162 of file inflate.c.

◆ ENOUGH

#define ENOUGH   (ENOUGH_LENS+ENOUGH_DISTS)

Definition at line 147 of file inflate.c.

◆ ENOUGH_DISTS

#define ENOUGH_DISTS   592

Definition at line 146 of file inflate.c.

◆ ENOUGH_LENS

#define ENOUGH_LENS   852

Definition at line 145 of file inflate.c.

◆ GUNZIP

#define GUNZIP

Definition at line 47 of file inflate.c.

◆ INITBITS

#define INITBITS ( )
Value:
do { \
hold = 0; \
bits = 0; \
} while (0)

Definition at line 1133 of file inflate.c.

◆ LOAD

#define LOAD ( )
Value:
do { \
put = strm->next_out; \
left = strm->avail_out; \
next = strm->next_in; \
have = strm->avail_in; \
hold = state->hold; \
bits = state->bits; \
} while (0)
state
static int state
Definition: maze.c:121

Definition at line 1111 of file inflate.c.

◆ MAXBITS

#define MAXBITS   15

Definition at line 531 of file inflate.c.

◆ MOD

#define MOD (   a)    a %= BASE

Definition at line 68 of file inflate.c.

◆ MOD28

#define MOD28 (   a)    a %= BASE

Definition at line 69 of file inflate.c.

◆ MOD63

#define MOD63 (   a)    a %= BASE

Definition at line 70 of file inflate.c.

◆ NEEDBITS

#define NEEDBITS (   n)
Value:
do { \
while (bits < (unsigned)(n)) \
PULLBYTE(); \
} while (0)
n
GLdouble n
Definition: glext.h:7729
bits
GLenum GLint GLenum GLsizei GLsizei GLsizei GLint GLsizei const GLvoid * bits
Definition: glext.h:10929

Definition at line 1151 of file inflate.c.

◆ NMAX

#define NMAX   5552

Definition at line 59 of file inflate.c.

◆ PULLBYTE

#define PULLBYTE ( )
Value:
do { \
if (have == 0) goto inf_leave; \
have--; \
hold += (unsigned long)(*next++) << bits; \
bits += 8; \
} while (0)
bits
GLenum GLint GLenum GLsizei GLsizei GLsizei GLint GLsizei const GLvoid * bits
Definition: glext.h:10929
while
while(1)
Definition: macro.lex.yy.c:740
next
static unsigned __int64 next
Definition: rand_nt.c:6

Definition at line 1141 of file inflate.c.

◆ RESTORE

#define RESTORE ( )
Value:
do { \
strm->next_out = put; \
strm->avail_out = left; \
strm->next_in = next; \
strm->avail_in = have; \
state->hold = hold; \
state->bits = bits; \
} while (0)
bits
GLenum GLint GLenum GLsizei GLsizei GLsizei GLint GLsizei const GLvoid * bits
Definition: glext.h:10929
put
#define put(ret, state, sp, n)
Definition: match.c:105
left
GLint left
Definition: glext.h:7726
next
static unsigned __int64 next
Definition: rand_nt.c:6

Definition at line 1122 of file inflate.c.

◆ Trace

#define Trace (   x)

Definition at line 42 of file inflate.c.

◆ Tracecv

#define Tracecv (   c,
  x 
)

Definition at line 45 of file inflate.c.

◆ Tracev

#define Tracev (   x)

Definition at line 43 of file inflate.c.

◆ Tracevv

#define Tracevv (   x)

Definition at line 44 of file inflate.c.

◆ TRY_FREE

#define TRY_FREE (   s,
  p 
)    {if (p) ZFREE(s, p);}

Definition at line 52 of file inflate.c.

◆ UPDATE

#define UPDATE (   check,
  buf,
  len 
)    (state->flags ? crc32(check, buf, len) : adler32(check, buf, len))

Definition at line 1085 of file inflate.c.

◆ ZALLOC

#define ZALLOC (   strm,
  items,
  size 
)    (*((strm)->zalloc))((strm)->opaque, (items), (size))

Definition at line 49 of file inflate.c.

◆ ZFREE

#define ZFREE (   strm,
  addr 
)    (*((strm)->zfree))((strm)->opaque, (voidpf)(addr))

Definition at line 51 of file inflate.c.

◆ zmemcpy

#define zmemcpy   memcpy

Definition at line 38 of file inflate.c.

◆ zmemzero

#define zmemzero (   dest,
  len 
)    memset(dest, 0, len)

Definition at line 39 of file inflate.c.

◆ ZSWAP32

#define ZSWAP32 (   q)
Value:
((((q) >> 24) & 0xff) + (((q) >> 8) & 0xff00) + \
(((q) & 0xff00) << 8) + (((q) & 0xff) << 24))
q
GLdouble GLdouble GLdouble GLdouble q
Definition: gl.h:2063

Definition at line 55 of file inflate.c.

Enumeration Type Documentation

◆ codetype

enum codetype
Enumerator
CODES 
LENS 
DISTS 
CODES 
LENS 
DISTS 

Definition at line 150 of file inflate.c.

150  {
151  CODES,
152  LENS,
153  DISTS
154 } codetype;
LENS
Definition: inflate.c:152
codetype
codetype
Definition: inflate.c:150
DISTS
Definition: inflate.c:153
CODES
Definition: inflate.c:151

◆ inflate_mode

enum inflate_mode
Enumerator
HEAD 
FLAGS 
TIME 
OS 
EXLEN 
EXTRA 
NAME 
COMMENT 
HCRC 
DICTID 
DICT 
TYPE 
TYPEDO 
STORED 
COPY_ 
COPY 
TABLE 
LENLENS 
CODELENS 
LEN_ 
LEN 
LENEXT 
DIST 
DISTEXT 
MATCH 
LIT 
CHECK 
LENGTH 
DONE 
BAD 
MEM 
SYNC 
METHOD 
FLAG 
DICT4 
DICT3 
DICT2 
DICT1 
DICT0 
BLOCKS 
CHECK4 
CHECK3 
CHECK2 
CHECK1 
DONE 
BAD 
HEAD 
FLAGS 
TIME 
OS 
EXLEN 
EXTRA 
NAME 
COMMENT 
HCRC 
DICTID 
DICT 
TYPE 
TYPEDO 
STORED 
COPY_ 
COPY 
TABLE 
LENLENS 
CODELENS 
LEN_ 
LEN 
LENEXT 
DIST 
DISTEXT 
MATCH 
LIT 
CHECK 
LENGTH 
DONE 
BAD 
MEM 
SYNC 

Definition at line 157 of file inflate.c.

157  {
158  HEAD = 16180, /* i: waiting for magic header */
159  FLAGS, /* i: waiting for method and flags (gzip) */
160  TIME, /* i: waiting for modification time (gzip) */
161  OS, /* i: waiting for extra flags and operating system (gzip) */
162  EXLEN, /* i: waiting for extra length (gzip) */
163  EXTRA, /* i: waiting for extra bytes (gzip) */
164  NAME, /* i: waiting for end of file name (gzip) */
165  COMMENT, /* i: waiting for end of comment (gzip) */
166  HCRC, /* i: waiting for header crc (gzip) */
167  DICTID, /* i: waiting for dictionary check value */
168  DICT, /* waiting for inflateSetDictionary() call */
169  TYPE, /* i: waiting for type bits, including last-flag bit */
170  TYPEDO, /* i: same, but skip check to exit inflate on new block */
171  STORED, /* i: waiting for stored size (length and complement) */
172  COPY_, /* i/o: same as COPY below, but only first time in */
173  COPY, /* i/o: waiting for input or output to copy stored block */
174  TABLE, /* i: waiting for dynamic block table lengths */
175  LENLENS, /* i: waiting for code length code lengths */
176  CODELENS, /* i: waiting for length/lit and distance code lengths */
177  LEN_, /* i: same as LEN below, but only first time in */
178  LEN, /* i: waiting for length/lit/eob code */
179  LENEXT, /* i: waiting for length extra bits */
180  DIST, /* i: waiting for distance code */
181  DISTEXT, /* i: waiting for distance extra bits */
182  MATCH, /* o: waiting for output space to copy string */
183  LIT, /* o: waiting for output space to write literal */
184  CHECK, /* i: waiting for 32-bit check value */
185  LENGTH, /* i: waiting for 32-bit length (gzip) */
186  DONE, /* finished check, done -- remain here until reset */
187  BAD, /* got a data error -- remain here until reset */
188  MEM, /* got an inflate() memory error -- remain here until reset */
189  SYNC /* looking for synchronization bytes to restart inflate() */
190 } inflate_mode;
OS
Definition: inflate.c:161
FLAGS
Definition: inflate.c:159
DONE
Definition: inflate.c:186
NAME
Definition: inflate.c:164
TIME
Definition: inflate.c:160
LEN_
Definition: inflate.c:177
CHECK
Definition: inflate.c:184
COPY
Definition: inflate.c:173
BAD
Definition: inflate.c:187
LEN
Definition: inflate.c:178
DIST
Definition: inflate.c:180
_HEAD
Definition: ntuser.h:174
COPY_
Definition: inflate.c:172
TYPE
Definition: inflate.c:169
MEM
Definition: inflate.c:188
inflate_mode
inflate_mode
Definition: inflate.c:157
EXLEN
Definition: inflate.c:162
SYNC
Definition: inflate.c:189
DICT
Definition: inflate.c:168
MATCH
Definition: inflate.c:182
HCRC
Definition: inflate.c:166
LIT
Definition: inflate.c:183
EXTRA
Definition: inflate.c:163
TABLE
Definition: inflate.c:174

Function Documentation

◆ adler32()

static uLong adler32 ( uLong  adler,
const Bytef *  buf,
uInt  len 
)
static

Definition at line 72 of file inflate.c.

73 {
74  unsigned long sum2;
75  unsigned n;
76 
77  /* split Adler-32 into component sums */
78  sum2 = (adler >> 16) & 0xffff;
79  adler &= 0xffff;
80 
81  /* in case user likes doing a byte at a time, keep it fast */
82  if (len == 1) {
83  adler += buf[0];
84  if (adler >= BASE)
85  adler -= BASE;
86  sum2 += adler;
87  if (sum2 >= BASE)
88  sum2 -= BASE;
89  return adler | (sum2 << 16);
90  }
91 
92  /* initial Adler-32 value (deferred check for len == 1 speed) */
93  if (buf == Z_NULL)
94  return 1L;
95 
96  /* in case short lengths are provided, keep it somewhat fast */
97  if (len < 16) {
98  while (len--) {
99  adler += *buf++;
100  sum2 += adler;
101  }
102  if (adler >= BASE)
103  adler -= BASE;
104  MOD28(sum2); /* only added so many BASE's */
105  return adler | (sum2 << 16);
106  }
107 
108  /* do length NMAX blocks -- requires just one modulo operation */
109  while (len >= NMAX) {
110  len -= NMAX;
111  n = NMAX / 16; /* NMAX is divisible by 16 */
112  do {
113  DO16(buf); /* 16 sums unrolled */
114  buf += 16;
115  } while (--n);
116  MOD(adler);
117  MOD(sum2);
118  }
119 
120  /* do remaining bytes (less than NMAX, still just one modulo) */
121  if (len) { /* avoid modulos if none remaining */
122  while (len >= 16) {
123  len -= 16;
124  DO16(buf);
125  buf += 16;
126  }
127  while (len--) {
128  adler += *buf++;
129  sum2 += adler;
130  }
131  MOD(adler);
132  MOD(sum2);
133  }
134 
135  /* return recombined sums */
136  return adler | (sum2 << 16);
137 }
MOD28
#define MOD28(a)
Definition: inflate.c:69
buf
GLenum GLuint GLenum GLsizei const GLchar * buf
Definition: glext.h:7751
n
GLdouble n
Definition: glext.h:7729
MOD
#define MOD(a)
Definition: inflate.c:68
NMAX
#define NMAX
Definition: inflate.c:59
DO16
#define DO16(buf)
Definition: inflate.c:66
L
static const WCHAR L[]
Definition: oid.c:1250
len
GLenum GLsizei len
Definition: glext.h:6722
Z_NULL
#define Z_NULL
Definition: zlib.h:149
BASE
#define BASE
Definition: inflate.c:58

Referenced by inflate().

◆ fixedtables()

static void fixedtables ( struct inflate_state FAR *  state)
static

Definition at line 924 of file inflate.c.

925 {
926  static const code lenfix[512] = {
927  {96,7,0},{0,8,80},{0,8,16},{20,8,115},{18,7,31},{0,8,112},{0,8,48},
928  {0,9,192},{16,7,10},{0,8,96},{0,8,32},{0,9,160},{0,8,0},{0,8,128},
929  {0,8,64},{0,9,224},{16,7,6},{0,8,88},{0,8,24},{0,9,144},{19,7,59},
930  {0,8,120},{0,8,56},{0,9,208},{17,7,17},{0,8,104},{0,8,40},{0,9,176},
931  {0,8,8},{0,8,136},{0,8,72},{0,9,240},{16,7,4},{0,8,84},{0,8,20},
932  {21,8,227},{19,7,43},{0,8,116},{0,8,52},{0,9,200},{17,7,13},{0,8,100},
933  {0,8,36},{0,9,168},{0,8,4},{0,8,132},{0,8,68},{0,9,232},{16,7,8},
934  {0,8,92},{0,8,28},{0,9,152},{20,7,83},{0,8,124},{0,8,60},{0,9,216},
935  {18,7,23},{0,8,108},{0,8,44},{0,9,184},{0,8,12},{0,8,140},{0,8,76},
936  {0,9,248},{16,7,3},{0,8,82},{0,8,18},{21,8,163},{19,7,35},{0,8,114},
937  {0,8,50},{0,9,196},{17,7,11},{0,8,98},{0,8,34},{0,9,164},{0,8,2},
938  {0,8,130},{0,8,66},{0,9,228},{16,7,7},{0,8,90},{0,8,26},{0,9,148},
939  {20,7,67},{0,8,122},{0,8,58},{0,9,212},{18,7,19},{0,8,106},{0,8,42},
940  {0,9,180},{0,8,10},{0,8,138},{0,8,74},{0,9,244},{16,7,5},{0,8,86},
941  {0,8,22},{64,8,0},{19,7,51},{0,8,118},{0,8,54},{0,9,204},{17,7,15},
942  {0,8,102},{0,8,38},{0,9,172},{0,8,6},{0,8,134},{0,8,70},{0,9,236},
943  {16,7,9},{0,8,94},{0,8,30},{0,9,156},{20,7,99},{0,8,126},{0,8,62},
944  {0,9,220},{18,7,27},{0,8,110},{0,8,46},{0,9,188},{0,8,14},{0,8,142},
945  {0,8,78},{0,9,252},{96,7,0},{0,8,81},{0,8,17},{21,8,131},{18,7,31},
946  {0,8,113},{0,8,49},{0,9,194},{16,7,10},{0,8,97},{0,8,33},{0,9,162},
947  {0,8,1},{0,8,129},{0,8,65},{0,9,226},{16,7,6},{0,8,89},{0,8,25},
948  {0,9,146},{19,7,59},{0,8,121},{0,8,57},{0,9,210},{17,7,17},{0,8,105},
949  {0,8,41},{0,9,178},{0,8,9},{0,8,137},{0,8,73},{0,9,242},{16,7,4},
950  {0,8,85},{0,8,21},{16,8,258},{19,7,43},{0,8,117},{0,8,53},{0,9,202},
951  {17,7,13},{0,8,101},{0,8,37},{0,9,170},{0,8,5},{0,8,133},{0,8,69},
952  {0,9,234},{16,7,8},{0,8,93},{0,8,29},{0,9,154},{20,7,83},{0,8,125},
953  {0,8,61},{0,9,218},{18,7,23},{0,8,109},{0,8,45},{0,9,186},{0,8,13},
954  {0,8,141},{0,8,77},{0,9,250},{16,7,3},{0,8,83},{0,8,19},{21,8,195},
955  {19,7,35},{0,8,115},{0,8,51},{0,9,198},{17,7,11},{0,8,99},{0,8,35},
956  {0,9,166},{0,8,3},{0,8,131},{0,8,67},{0,9,230},{16,7,7},{0,8,91},
957  {0,8,27},{0,9,150},{20,7,67},{0,8,123},{0,8,59},{0,9,214},{18,7,19},
958  {0,8,107},{0,8,43},{0,9,182},{0,8,11},{0,8,139},{0,8,75},{0,9,246},
959  {16,7,5},{0,8,87},{0,8,23},{64,8,0},{19,7,51},{0,8,119},{0,8,55},
960  {0,9,206},{17,7,15},{0,8,103},{0,8,39},{0,9,174},{0,8,7},{0,8,135},
961  {0,8,71},{0,9,238},{16,7,9},{0,8,95},{0,8,31},{0,9,158},{20,7,99},
962  {0,8,127},{0,8,63},{0,9,222},{18,7,27},{0,8,111},{0,8,47},{0,9,190},
963  {0,8,15},{0,8,143},{0,8,79},{0,9,254},{96,7,0},{0,8,80},{0,8,16},
964  {20,8,115},{18,7,31},{0,8,112},{0,8,48},{0,9,193},{16,7,10},{0,8,96},
965  {0,8,32},{0,9,161},{0,8,0},{0,8,128},{0,8,64},{0,9,225},{16,7,6},
966  {0,8,88},{0,8,24},{0,9,145},{19,7,59},{0,8,120},{0,8,56},{0,9,209},
967  {17,7,17},{0,8,104},{0,8,40},{0,9,177},{0,8,8},{0,8,136},{0,8,72},
968  {0,9,241},{16,7,4},{0,8,84},{0,8,20},{21,8,227},{19,7,43},{0,8,116},
969  {0,8,52},{0,9,201},{17,7,13},{0,8,100},{0,8,36},{0,9,169},{0,8,4},
970  {0,8,132},{0,8,68},{0,9,233},{16,7,8},{0,8,92},{0,8,28},{0,9,153},
971  {20,7,83},{0,8,124},{0,8,60},{0,9,217},{18,7,23},{0,8,108},{0,8,44},
972  {0,9,185},{0,8,12},{0,8,140},{0,8,76},{0,9,249},{16,7,3},{0,8,82},
973  {0,8,18},{21,8,163},{19,7,35},{0,8,114},{0,8,50},{0,9,197},{17,7,11},
974  {0,8,98},{0,8,34},{0,9,165},{0,8,2},{0,8,130},{0,8,66},{0,9,229},
975  {16,7,7},{0,8,90},{0,8,26},{0,9,149},{20,7,67},{0,8,122},{0,8,58},
976  {0,9,213},{18,7,19},{0,8,106},{0,8,42},{0,9,181},{0,8,10},{0,8,138},
977  {0,8,74},{0,9,245},{16,7,5},{0,8,86},{0,8,22},{64,8,0},{19,7,51},
978  {0,8,118},{0,8,54},{0,9,205},{17,7,15},{0,8,102},{0,8,38},{0,9,173},
979  {0,8,6},{0,8,134},{0,8,70},{0,9,237},{16,7,9},{0,8,94},{0,8,30},
980  {0,9,157},{20,7,99},{0,8,126},{0,8,62},{0,9,221},{18,7,27},{0,8,110},
981  {0,8,46},{0,9,189},{0,8,14},{0,8,142},{0,8,78},{0,9,253},{96,7,0},
982  {0,8,81},{0,8,17},{21,8,131},{18,7,31},{0,8,113},{0,8,49},{0,9,195},
983  {16,7,10},{0,8,97},{0,8,33},{0,9,163},{0,8,1},{0,8,129},{0,8,65},
984  {0,9,227},{16,7,6},{0,8,89},{0,8,25},{0,9,147},{19,7,59},{0,8,121},
985  {0,8,57},{0,9,211},{17,7,17},{0,8,105},{0,8,41},{0,9,179},{0,8,9},
986  {0,8,137},{0,8,73},{0,9,243},{16,7,4},{0,8,85},{0,8,21},{16,8,258},
987  {19,7,43},{0,8,117},{0,8,53},{0,9,203},{17,7,13},{0,8,101},{0,8,37},
988  {0,9,171},{0,8,5},{0,8,133},{0,8,69},{0,9,235},{16,7,8},{0,8,93},
989  {0,8,29},{0,9,155},{20,7,83},{0,8,125},{0,8,61},{0,9,219},{18,7,23},
990  {0,8,109},{0,8,45},{0,9,187},{0,8,13},{0,8,141},{0,8,77},{0,9,251},
991  {16,7,3},{0,8,83},{0,8,19},{21,8,195},{19,7,35},{0,8,115},{0,8,51},
992  {0,9,199},{17,7,11},{0,8,99},{0,8,35},{0,9,167},{0,8,3},{0,8,131},
993  {0,8,67},{0,9,231},{16,7,7},{0,8,91},{0,8,27},{0,9,151},{20,7,67},
994  {0,8,123},{0,8,59},{0,9,215},{18,7,19},{0,8,107},{0,8,43},{0,9,183},
995  {0,8,11},{0,8,139},{0,8,75},{0,9,247},{16,7,5},{0,8,87},{0,8,23},
996  {64,8,0},{19,7,51},{0,8,119},{0,8,55},{0,9,207},{17,7,15},{0,8,103},
997  {0,8,39},{0,9,175},{0,8,7},{0,8,135},{0,8,71},{0,9,239},{16,7,9},
998  {0,8,95},{0,8,31},{0,9,159},{20,7,99},{0,8,127},{0,8,63},{0,9,223},
999  {18,7,27},{0,8,111},{0,8,47},{0,9,191},{0,8,15},{0,8,143},{0,8,79},
1000  {0,9,255}
1001  };
1002 
1003  static const code distfix[32] = {
1004  {16,5,1},{23,5,257},{19,5,17},{27,5,4097},{17,5,5},{25,5,1025},
1005  {21,5,65},{29,5,16385},{16,5,3},{24,5,513},{20,5,33},{28,5,8193},
1006  {18,5,9},{26,5,2049},{22,5,129},{64,5,0},{16,5,2},{23,5,385},
1007  {19,5,25},{27,5,6145},{17,5,7},{25,5,1537},{21,5,97},{29,5,24577},
1008  {16,5,4},{24,5,769},{20,5,49},{28,5,12289},{18,5,13},{26,5,3073},
1009  {22,5,193},{64,5,0}
1010  };
1011 
1012  state->lencode = lenfix;
1013  state->lenbits = 9;
1014  state->distcode = distfix;
1015  state->distbits = 5;
1016 }
lenfix
static const code lenfix[512]
Definition: inffixed.h:10
state
static int state
Definition: maze.c:121
code
Definition: inflate.c:139
distfix
static const code distfix[32]
Definition: inffixed.h:87

Referenced by inflate().

◆ inflate()

int inflate ( z_streamp  strm,
int  flush 
)

Definition at line 1257 of file inflate.c.

1258 {
1259  struct inflate_state FAR *state;
1260  z_const unsigned char FAR *next; /* next input */
1261  unsigned char FAR *put; /* next output */
1262  unsigned have, left; /* available input and output */
1263  unsigned long hold; /* bit buffer */
1264  unsigned bits; /* bits in bit buffer */
1265  unsigned in, out; /* save starting available input and output */
1266  unsigned copy; /* number of stored or match bytes to copy */
1267  unsigned char FAR *from; /* where to copy match bytes from */
1268  code here; /* current decoding table entry */
1269  code last; /* parent table entry */
1270  unsigned len; /* length to copy for repeats, bits to drop */
1271  int ret; /* return code */
1272 #ifdef GUNZIP
1273  unsigned char hbuf[4]; /* buffer for gzip header crc calculation */
1274 #endif
1275  static const unsigned short order[19] = /* permutation of code lengths */
1276  {16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15};
1277 
1278  if (inflateStateCheck(strm) || strm->next_out == Z_NULL ||
1279  (strm->next_in == Z_NULL && strm->avail_in != 0))
1280  return Z_STREAM_ERROR;
1281 
1282  state = (struct inflate_state FAR *)strm->state;
1283  if (state->mode == TYPE) state->mode = TYPEDO; /* skip check */
1284  LOAD();
1285  in = have;
1286  out = left;
1287  ret = Z_OK;
1288  for (;;)
1289  switch (state->mode) {
1290  case HEAD:
1291  if (state->wrap == 0) {
1292  state->mode = TYPEDO;
1293  break;
1294  }
1295  NEEDBITS(16);
1296 #ifdef GUNZIP
1297  if ((state->wrap & 2) && hold == 0x8b1f) { /* gzip header */
1298  if (state->wbits == 0)
1299  state->wbits = 15;
1300  state->check = crc32(0L, Z_NULL, 0);
1301  CRC2(state->check, hold);
1302  INITBITS();
1303  state->mode = FLAGS;
1304  break;
1305  }
1306  state->flags = 0; /* expect zlib header */
1307  if (state->head != Z_NULL)
1308  state->head->done = -1;
1309  if (!(state->wrap & 1) || /* check if zlib header allowed */
1310 #else
1311  if (
1312 #endif
1313  ((BITS(8) << 8) + (hold >> 8)) % 31) {
1314  strm->msg = (char *)"incorrect header check";
1315  state->mode = BAD;
1316  break;
1317  }
1318  if (BITS(4) != Z_DEFLATED) {
1319  strm->msg = (char *)"unknown compression method";
1320  state->mode = BAD;
1321  break;
1322  }
1323  DROPBITS(4);
1324  len = BITS(4) + 8;
1325  if (state->wbits == 0)
1326  state->wbits = len;
1327  if (len > 15 || len > state->wbits) {
1328  strm->msg = (char *)"invalid window size";
1329  state->mode = BAD;
1330  break;
1331  }
1332  state->dmax = 1U << len;
1333  Tracev((stderr, "inflate: zlib header ok\n"));
1334  strm->adler = state->check = adler32(0L, Z_NULL, 0);
1335  state->mode = hold & 0x200 ? DICTID : TYPE;
1336  INITBITS();
1337  break;
1338 #ifdef GUNZIP
1339  case FLAGS:
1340  NEEDBITS(16);
1341  state->flags = (int)(hold);
1342  if ((state->flags & 0xff) != Z_DEFLATED) {
1343  strm->msg = (char *)"unknown compression method";
1344  state->mode = BAD;
1345  break;
1346  }
1347  if (state->flags & 0xe000) {
1348  strm->msg = (char *)"unknown header flags set";
1349  state->mode = BAD;
1350  break;
1351  }
1352  if (state->head != Z_NULL)
1353  state->head->text = (int)((hold >> 8) & 1);
1354  if ((state->flags & 0x0200) && (state->wrap & 4))
1355  CRC2(state->check, hold);
1356  INITBITS();
1357  state->mode = TIME;
1358  case TIME:
1359  NEEDBITS(32);
1360  if (state->head != Z_NULL)
1361  state->head->time = hold;
1362  if ((state->flags & 0x0200) && (state->wrap & 4))
1363  CRC4(state->check, hold);
1364  INITBITS();
1365  state->mode = OS;
1366  case OS:
1367  NEEDBITS(16);
1368  if (state->head != Z_NULL) {
1369  state->head->xflags = (int)(hold & 0xff);
1370  state->head->os = (int)(hold >> 8);
1371  }
1372  if ((state->flags & 0x0200) && (state->wrap & 4))
1373  CRC2(state->check, hold);
1374  INITBITS();
1375  state->mode = EXLEN;
1376  case EXLEN:
1377  if (state->flags & 0x0400) {
1378  NEEDBITS(16);
1379  state->length = (unsigned)(hold);
1380  if (state->head != Z_NULL)
1381  state->head->extra_len = (unsigned)hold;
1382  if ((state->flags & 0x0200) && (state->wrap & 4))
1383  CRC2(state->check, hold);
1384  INITBITS();
1385  }
1386  else if (state->head != Z_NULL)
1387  state->head->extra = Z_NULL;
1388  state->mode = EXTRA;
1389  case EXTRA:
1390  if (state->flags & 0x0400) {
1391  copy = state->length;
1392  if (copy > have) copy = have;
1393  if (copy) {
1394  if (state->head != Z_NULL &&
1395  state->head->extra != Z_NULL) {
1396  len = state->head->extra_len - state->length;
1397  zmemcpy(state->head->extra + len, next,
1398  len + copy > state->head->extra_max ?
1399  state->head->extra_max - len : copy);
1400  }
1401  if ((state->flags & 0x0200) && (state->wrap & 4))
1402  state->check = crc32(state->check, next, copy);
1403  have -= copy;
1404  next += copy;
1405  state->length -= copy;
1406  }
1407  if (state->length) goto inf_leave;
1408  }
1409  state->length = 0;
1410  state->mode = NAME;
1411  case NAME:
1412  if (state->flags & 0x0800) {
1413  if (have == 0) goto inf_leave;
1414  copy = 0;
1415  do {
1416  len = (unsigned)(next[copy++]);
1417  if (state->head != Z_NULL &&
1418  state->head->name != Z_NULL &&
1419  state->length < state->head->name_max)
1420  state->head->name[state->length++] = (Bytef)len;
1421  } while (len && copy < have);
1422  if ((state->flags & 0x0200) && (state->wrap & 4))
1423  state->check = crc32(state->check, next, copy);
1424  have -= copy;
1425  next += copy;
1426  if (len) goto inf_leave;
1427  }
1428  else if (state->head != Z_NULL)
1429  state->head->name = Z_NULL;
1430  state->length = 0;
1431  state->mode = COMMENT;
1432  case COMMENT:
1433  if (state->flags & 0x1000) {
1434  if (have == 0) goto inf_leave;
1435  copy = 0;
1436  do {
1437  len = (unsigned)(next[copy++]);
1438  if (state->head != Z_NULL &&
1439  state->head->comment != Z_NULL &&
1440  state->length < state->head->comm_max)
1441  state->head->comment[state->length++] = (Bytef)len;
1442  } while (len && copy < have);
1443  if ((state->flags & 0x0200) && (state->wrap & 4))
1444  state->check = crc32(state->check, next, copy);
1445  have -= copy;
1446  next += copy;
1447  if (len) goto inf_leave;
1448  }
1449  else if (state->head != Z_NULL)
1450  state->head->comment = Z_NULL;
1451  state->mode = HCRC;
1452  case HCRC:
1453  if (state->flags & 0x0200) {
1454  NEEDBITS(16);
1455  if ((state->wrap & 4) && hold != (state->check & 0xffff)) {
1456  strm->msg = (char *)"header crc mismatch";
1457  state->mode = BAD;
1458  break;
1459  }
1460  INITBITS();
1461  }
1462  if (state->head != Z_NULL) {
1463  state->head->hcrc = (int)((state->flags >> 9) & 1);
1464  state->head->done = 1;
1465  }
1466  strm->adler = state->check = crc32(0L, Z_NULL, 0);
1467  state->mode = TYPE;
1468  break;
1469 #endif
1470  case DICTID:
1471  NEEDBITS(32);
1472  strm->adler = state->check = ZSWAP32(hold);
1473  INITBITS();
1474  state->mode = DICT;
1475  case DICT:
1476  if (state->havedict == 0) {
1477  RESTORE();
1478  return Z_NEED_DICT;
1479  }
1480  strm->adler = state->check = adler32(0L, Z_NULL, 0);
1481  state->mode = TYPE;
1482  case TYPE:
1483  if (flush == Z_BLOCK || flush == Z_TREES) goto inf_leave;
1484  case TYPEDO:
1485  if (state->last) {
1486  BYTEBITS();
1487  state->mode = CHECK;
1488  break;
1489  }
1490  NEEDBITS(3);
1491  state->last = BITS(1);
1492  DROPBITS(1);
1493  switch (BITS(2)) {
1494  case 0: /* stored block */
1495  Tracev((stderr, "inflate: stored block%s\n",
1496  state->last ? " (last)" : ""));
1497  state->mode = STORED;
1498  break;
1499  case 1: /* fixed block */
1500  fixedtables(state);
1501  Tracev((stderr, "inflate: fixed codes block%s\n",
1502  state->last ? " (last)" : ""));
1503  state->mode = LEN_; /* decode codes */
1504  if (flush == Z_TREES) {
1505  DROPBITS(2);
1506  goto inf_leave;
1507  }
1508  break;
1509  case 2: /* dynamic block */
1510  Tracev((stderr, "inflate: dynamic codes block%s\n",
1511  state->last ? " (last)" : ""));
1512  state->mode = TABLE;
1513  break;
1514  case 3:
1515  strm->msg = (char *)"invalid block type";
1516  state->mode = BAD;
1517  }
1518  DROPBITS(2);
1519  break;
1520  case STORED:
1521  BYTEBITS(); /* go to byte boundary */
1522  NEEDBITS(32);
1523  if ((hold & 0xffff) != ((hold >> 16) ^ 0xffff)) {
1524  strm->msg = (char *)"invalid stored block lengths";
1525  state->mode = BAD;
1526  break;
1527  }
1528  state->length = (unsigned)hold & 0xffff;
1529  Tracev((stderr, "inflate: stored length %u\n",
1530  state->length));
1531  INITBITS();
1532  state->mode = COPY_;
1533  if (flush == Z_TREES) goto inf_leave;
1534  case COPY_:
1535  state->mode = COPY;
1536  case COPY:
1537  copy = state->length;
1538  if (copy) {
1539  if (copy > have) copy = have;
1540  if (copy > left) copy = left;
1541  if (copy == 0) goto inf_leave;
1542  zmemcpy(put, next, copy);
1543  have -= copy;
1544  next += copy;
1545  left -= copy;
1546  put += copy;
1547  state->length -= copy;
1548  break;
1549  }
1550  Tracev((stderr, "inflate: stored end\n"));
1551  state->mode = TYPE;
1552  break;
1553  case TABLE:
1554  NEEDBITS(14);
1555  state->nlen = BITS(5) + 257;
1556  DROPBITS(5);
1557  state->ndist = BITS(5) + 1;
1558  DROPBITS(5);
1559  state->ncode = BITS(4) + 4;
1560  DROPBITS(4);
1561 #ifndef PKZIP_BUG_WORKAROUND
1562  if (state->nlen > 286 || state->ndist > 30) {
1563  strm->msg = (char *)"too many length or distance symbols";
1564  state->mode = BAD;
1565  break;
1566  }
1567 #endif
1568  Tracev((stderr, "inflate: table sizes ok\n"));
1569  state->have = 0;
1570  state->mode = LENLENS;
1571  case LENLENS:
1572  while (state->have < state->ncode) {
1573  NEEDBITS(3);
1574  state->lens[order[state->have++]] = (unsigned short)BITS(3);
1575  DROPBITS(3);
1576  }
1577  while (state->have < 19)
1578  state->lens[order[state->have++]] = 0;
1579  state->next = state->codes;
1580  state->lencode = (const code FAR *)(state->next);
1581  state->lenbits = 7;
1582  ret = inflate_table(CODES, state->lens, 19, &(state->next),
1583  &(state->lenbits), state->work);
1584  if (ret) {
1585  strm->msg = (char *)"invalid code lengths set";
1586  state->mode = BAD;
1587  break;
1588  }
1589  Tracev((stderr, "inflate: code lengths ok\n"));
1590  state->have = 0;
1591  state->mode = CODELENS;
1592  case CODELENS:
1593  while (state->have < state->nlen + state->ndist) {
1594  for (;;) {
1595  here = state->lencode[BITS(state->lenbits)];
1596  if ((unsigned)(here.bits) <= bits) break;
1597  PULLBYTE();
1598  }
1599  if (here.val < 16) {
1600  DROPBITS(here.bits);
1601  state->lens[state->have++] = here.val;
1602  }
1603  else {
1604  if (here.val == 16) {
1605  NEEDBITS(here.bits + 2);
1606  DROPBITS(here.bits);
1607  if (state->have == 0) {
1608  strm->msg = (char *)"invalid bit length repeat";
1609  state->mode = BAD;
1610  break;
1611  }
1612  len = state->lens[state->have - 1];
1613  copy = 3 + BITS(2);
1614  DROPBITS(2);
1615  }
1616  else if (here.val == 17) {
1617  NEEDBITS(here.bits + 3);
1618  DROPBITS(here.bits);
1619  len = 0;
1620  copy = 3 + BITS(3);
1621  DROPBITS(3);
1622  }
1623  else {
1624  NEEDBITS(here.bits + 7);
1625  DROPBITS(here.bits);
1626  len = 0;
1627  copy = 11 + BITS(7);
1628  DROPBITS(7);
1629  }
1630  if (state->have + copy > state->nlen + state->ndist) {
1631  strm->msg = (char *)"invalid bit length repeat";
1632  state->mode = BAD;
1633  break;
1634  }
1635  while (copy--)
1636  state->lens[state->have++] = (unsigned short)len;
1637  }
1638  }
1639 
1640  /* handle error breaks in while */
1641  if (state->mode == BAD) break;
1642 
1643  /* check for end-of-block code (better have one) */
1644  if (state->lens[256] == 0) {
1645  strm->msg = (char *)"invalid code -- missing end-of-block";
1646  state->mode = BAD;
1647  break;
1648  }
1649 
1650  /* build code tables -- note: do not change the lenbits or distbits
1651  values here (9 and 6) without reading the comments in inftrees.h
1652  concerning the ENOUGH constants, which depend on those values */
1653  state->next = state->codes;
1654  state->lencode = (const code FAR *)(state->next);
1655  state->lenbits = 9;
1656  ret = inflate_table(LENS, state->lens, state->nlen, &(state->next),
1657  &(state->lenbits), state->work);
1658  if (ret) {
1659  strm->msg = (char *)"invalid literal/lengths set";
1660  state->mode = BAD;
1661  break;
1662  }
1663  state->distcode = (const code FAR *)(state->next);
1664  state->distbits = 6;
1665  ret = inflate_table(DISTS, state->lens + state->nlen, state->ndist,
1666  &(state->next), &(state->distbits), state->work);
1667  if (ret) {
1668  strm->msg = (char *)"invalid distances set";
1669  state->mode = BAD;
1670  break;
1671  }
1672  Tracev((stderr, "inflate: codes ok\n"));
1673  state->mode = LEN_;
1674  if (flush == Z_TREES) goto inf_leave;
1675  case LEN_:
1676  state->mode = LEN;
1677  case LEN:
1678  if (have >= 6 && left >= 258) {
1679  RESTORE();
1680  inflate_fast(strm, out);
1681  LOAD();
1682  if (state->mode == TYPE)
1683  state->back = -1;
1684  break;
1685  }
1686  state->back = 0;
1687  for (;;) {
1688  here = state->lencode[BITS(state->lenbits)];
1689  if ((unsigned)(here.bits) <= bits) break;
1690  PULLBYTE();
1691  }
1692  if (here.op && (here.op & 0xf0) == 0) {
1693  last = here;
1694  for (;;) {
1695  here = state->lencode[last.val +
1696  (BITS(last.bits + last.op) >> last.bits)];
1697  if ((unsigned)(last.bits + here.bits) <= bits) break;
1698  PULLBYTE();
1699  }
1700  DROPBITS(last.bits);
1701  state->back += last.bits;
1702  }
1703  DROPBITS(here.bits);
1704  state->back += here.bits;
1705  state->length = (unsigned)here.val;
1706  if ((int)(here.op) == 0) {
1707  Tracevv((stderr, here.val >= 0x20 && here.val < 0x7f ?
1708  "inflate: literal '%c'\n" :
1709  "inflate: literal 0x%02x\n", here.val));
1710  state->mode = LIT;
1711  break;
1712  }
1713  if (here.op & 32) {
1714  Tracevv((stderr, "inflate: end of block\n"));
1715  state->back = -1;
1716  state->mode = TYPE;
1717  break;
1718  }
1719  if (here.op & 64) {
1720  strm->msg = (char *)"invalid literal/length code";
1721  state->mode = BAD;
1722  break;
1723  }
1724  state->extra = (unsigned)(here.op) & 15;
1725  state->mode = LENEXT;
1726  case LENEXT:
1727  if (state->extra) {
1728  NEEDBITS(state->extra);
1729  state->length += BITS(state->extra);
1730  DROPBITS(state->extra);
1731  state->back += state->extra;
1732  }
1733  Tracevv((stderr, "inflate: length %u\n", state->length));
1734  state->was = state->length;
1735  state->mode = DIST;
1736  case DIST:
1737  for (;;) {
1738  here = state->distcode[BITS(state->distbits)];
1739  if ((unsigned)(here.bits) <= bits) break;
1740  PULLBYTE();
1741  }
1742  if ((here.op & 0xf0) == 0) {
1743  last = here;
1744  for (;;) {
1745  here = state->distcode[last.val +
1746  (BITS(last.bits + last.op) >> last.bits)];
1747  if ((unsigned)(last.bits + here.bits) <= bits) break;
1748  PULLBYTE();
1749  }
1750  DROPBITS(last.bits);
1751  state->back += last.bits;
1752  }
1753  DROPBITS(here.bits);
1754  state->back += here.bits;
1755  if (here.op & 64) {
1756  strm->msg = (char *)"invalid distance code";
1757  state->mode = BAD;
1758  break;
1759  }
1760  state->offset = (unsigned)here.val;
1761  state->extra = (unsigned)(here.op) & 15;
1762  state->mode = DISTEXT;
1763  case DISTEXT:
1764  if (state->extra) {
1765  NEEDBITS(state->extra);
1766  state->offset += BITS(state->extra);
1767  DROPBITS(state->extra);
1768  state->back += state->extra;
1769  }
1770 #ifdef INFLATE_STRICT
1771  if (state->offset > state->dmax) {
1772  strm->msg = (char *)"invalid distance too far back";
1773  state->mode = BAD;
1774  break;
1775  }
1776 #endif
1777  Tracevv((stderr, "inflate: distance %u\n", state->offset));
1778  state->mode = MATCH;
1779  case MATCH:
1780  if (left == 0) goto inf_leave;
1781  copy = out - left;
1782  if (state->offset > copy) { /* copy from window */
1783  copy = state->offset - copy;
1784  if (copy > state->whave) {
1785  if (state->sane) {
1786  strm->msg = (char *)"invalid distance too far back";
1787  state->mode = BAD;
1788  break;
1789  }
1790 #ifdef INFLATE_ALLOW_INVALID_DISTANCE_TOOFAR_ARRR
1791  Trace((stderr, "inflate.c too far\n"));
1792  copy -= state->whave;
1793  if (copy > state->length) copy = state->length;
1794  if (copy > left) copy = left;
1795  left -= copy;
1796  state->length -= copy;
1797  do {
1798  *put++ = 0;
1799  } while (--copy);
1800  if (state->length == 0) state->mode = LEN;
1801  break;
1802 #endif
1803  }
1804  if (copy > state->wnext) {
1805  copy -= state->wnext;
1806  from = state->window + (state->wsize - copy);
1807  }
1808  else
1809  from = state->window + (state->wnext - copy);
1810  if (copy > state->length) copy = state->length;
1811  }
1812  else { /* copy from output */
1813  from = put - state->offset;
1814  copy = state->length;
1815  }
1816  if (copy > left) copy = left;
1817  left -= copy;
1818  state->length -= copy;
1819  do {
1820  *put++ = *from++;
1821  } while (--copy);
1822  if (state->length == 0) state->mode = LEN;
1823  break;
1824  case LIT:
1825  if (left == 0) goto inf_leave;
1826  *put++ = (unsigned char)(state->length);
1827  left--;
1828  state->mode = LEN;
1829  break;
1830  case CHECK:
1831  if (state->wrap) {
1832  NEEDBITS(32);
1833  out -= left;
1834  strm->total_out += out;
1835  state->total += out;
1836  if ((state->wrap & 4) && out)
1837  strm->adler = state->check =
1838  UPDATE(state->check, put - out, out);
1839  out = left;
1840  if ((state->wrap & 4) && (
1841 #ifdef GUNZIP
1842  state->flags ? hold :
1843 #endif
1844  ZSWAP32(hold)) != state->check) {
1845  strm->msg = (char *)"incorrect data check";
1846  state->mode = BAD;
1847  break;
1848  }
1849  INITBITS();
1850  Tracev((stderr, "inflate: check matches trailer\n"));
1851  }
1852 #ifdef GUNZIP
1853  state->mode = LENGTH;
1854  case LENGTH:
1855  if (state->wrap && state->flags) {
1856  NEEDBITS(32);
1857  if (hold != (state->total & 0xffffffffUL)) {
1858  strm->msg = (char *)"incorrect length check";
1859  state->mode = BAD;
1860  break;
1861  }
1862  INITBITS();
1863  Tracev((stderr, "inflate: length matches trailer\n"));
1864  }
1865 #endif
1866  state->mode = DONE;
1867  case DONE:
1868  ret = Z_STREAM_END;
1869  goto inf_leave;
1870  case BAD:
1871  ret = Z_DATA_ERROR;
1872  goto inf_leave;
1873  case MEM:
1874  return Z_MEM_ERROR;
1875  case SYNC:
1876  default:
1877  return Z_STREAM_ERROR;
1878  }
1879 
1880  /*
1881  Return from inflate(), updating the total counts and the check value.
1882  If there was no progress during the inflate() call, return a buffer
1883  error. Call updatewindow() to create and/or update the window state.
1884  Note: a memory error from inflate() is non-recoverable.
1885  */
1886  inf_leave:
1887  RESTORE();
1888  if (state->wsize || (out != strm->avail_out && state->mode < BAD &&
1889  (state->mode < CHECK || flush != Z_FINISH)))
1890  if (updatewindow(strm, strm->next_out, out - strm->avail_out)) {
1891  state->mode = MEM;
1892  return Z_MEM_ERROR;
1893  }
1894  in -= strm->avail_in;
1895  out -= strm->avail_out;
1896  strm->total_in += in;
1897  strm->total_out += out;
1898  state->total += out;
1899  if ((state->wrap & 4) && out)
1900  strm->adler = state->check =
1901  UPDATE(state->check, strm->next_out - out, out);
1902  strm->data_type = (int)state->bits + (state->last ? 64 : 0) +
1903  (state->mode == TYPE ? 128 : 0) +
1904  (state->mode == LEN_ || state->mode == COPY_ ? 256 : 0);
1905  if (((in == 0 && out == 0) || flush == Z_FINISH) && ret == Z_OK)
1906  ret = Z_BUF_ERROR;
1907  return ret;
1908 }
Z_BLOCK
#define Z_BLOCK
Definition: zlib.h:110
OS
Definition: inflate.c:161
LENS
Definition: inflate.c:152
code::val
unsigned short val
Definition: inflate.c:142
RESTORE
#define RESTORE()
Definition: inflate.c:1122
order
GLuint GLdouble GLdouble GLint GLint order
Definition: glext.h:11194
FLAGS
Definition: inflate.c:159
updatewindow
static int updatewindow(z_streamp strm, const Bytef *end, unsigned copy)
Definition: inflate.c:1032
DONE
Definition: inflate.c:186
inflate_state
Definition: inflate.c:194
NAME
Definition: inflate.c:164
TIME
Definition: inflate.c:160
LEN_
Definition: inflate.c:177
CHECK
Definition: inflate.c:184
last
POINT last
Definition: font.c:46
Z_STREAM_ERROR
#define Z_STREAM_ERROR
Definition: zlib.h:118
Z_OK
#define Z_OK
Definition: zlib.h:114
U
#define U(x)
Definition: wordpad.c:45
inflate_state::strm
z_streamp strm
Definition: inflate.c:195
inflate_state::have
unsigned have
Definition: inflate.c:229
COPY
Definition: inflate.c:173
LOAD
#define LOAD()
Definition: inflate.c:1111
inflate_fast
static void inflate_fast(z_streamp strm, unsigned start)
Definition: inflate.c:274
Tracevv
#define Tracevv(x)
Definition: inflate.c:44
UPDATE
#define UPDATE(check, buf, len)
Definition: inflate.c:1085
PULLBYTE
#define PULLBYTE()
Definition: inflate.c:1141
adler32
static uLong adler32(uLong adler, const Bytef *buf, uInt len)
Definition: inflate.c:72
DROPBITS
#define DROPBITS(n)
Definition: inflate.c:1162
bits
GLenum GLint GLenum GLsizei GLsizei GLsizei GLint GLsizei const GLvoid * bits
Definition: glext.h:10929
code::op
unsigned char op
Definition: inflate.c:140
BAD
Definition: inflate.c:187
LEN
Definition: inflate.c:178
put
#define put(ret, state, sp, n)
Definition: match.c:105
short
unsigned short(__cdecl typeof(TIFFCurrentDirectory))(struct tiff *)
Definition: typeof.h:94
Z_STREAM_END
#define Z_STREAM_END
Definition: zlib.h:115
BYTEBITS
#define BYTEBITS()
Definition: inflate.c:1169
char
unsigned char
Definition: typeof.h:29
inflateStateCheck
static int inflateStateCheck(z_streamp strm)
Definition: inflate.c:802
Tracev
#define Tracev(x)
Definition: inflate.c:43
DIST
Definition: inflate.c:180
inflate_state::hold
unsigned long hold
Definition: inflate.c:213
COPY_
Definition: inflate.c:172
flush
int flush
Definition: zlib.h:309
zmemcpy
#define zmemcpy
Definition: inflate.c:38
TYPE
Definition: inflate.c:169
if
if(!(yy_init))
Definition: macro.lex.yy.c:714
MEM
Definition: inflate.c:188
CRC2
#define CRC2(check, word)
Definition: inflate.c:1093
GUNZIP
#define GUNZIP
Definition: inflate.c:47
ZSWAP32
#define ZSWAP32(q)
Definition: inflate.c:55
out
static FILE * out
Definition: regtests2xml.c:44
left
GLint left
Definition: glext.h:7726
BITS
#define BITS(n)
Definition: inflate.c:1158
EXLEN
Definition: inflate.c:162
ret
int ret
Definition: wcstombs-tests.c:31
code::bits
unsigned char bits
Definition: inflate.c:141
DISTS
Definition: inflate.c:153
L
static const WCHAR L[]
Definition: oid.c:1250
state
static int state
Definition: maze.c:121
len
GLenum GLsizei len
Definition: glext.h:6722
Trace
#define Trace(x)
Definition: inflate.c:42
INITBITS
#define INITBITS()
Definition: inflate.c:1133
code
Definition: inflate.c:139
CRC4
#define CRC4(check, word)
Definition: inflate.c:1100
Z_DEFLATED
#define Z_DEFLATED
Definition: zlib.h:146
Z_TREES
#define Z_TREES
Definition: zlib.h:111
Z_FINISH
#define Z_FINISH
Definition: zlib.h:109
Z_NULL
#define Z_NULL
Definition: zlib.h:149
next
static unsigned __int64 next
Definition: rand_nt.c:6
SYNC
Definition: inflate.c:189
NEEDBITS
#define NEEDBITS(n)
Definition: inflate.c:1151
in
GLuint in
Definition: glext.h:9616
TYPE
TYPE
Definition: eventcreate.c:651
DICT
Definition: inflate.c:168
Z_BUF_ERROR
#define Z_BUF_ERROR
Definition: zlib.h:121
copy
INT copy(TCHAR source[MAX_PATH], TCHAR dest[MAX_PATH], INT append, DWORD lpdwFlags, BOOL bTouch)
Definition: copy.c:51
MATCH
Definition: inflate.c:182
Z_NEED_DICT
#define Z_NEED_DICT
Definition: zlib.h:116
fixedtables
static void fixedtables(struct inflate_state FAR *state)
Definition: inflate.c:924
Bytef
Byte FAR Bytef
Definition: zlib.h:41
Z_MEM_ERROR
#define Z_MEM_ERROR
Definition: zlib.h:120
crc32
#define crc32(crc, buf, len)
Definition: inflate.c:1081
z_const
#define z_const
Definition: zlib.h:35
HCRC
Definition: inflate.c:166
Z_DATA_ERROR
#define Z_DATA_ERROR
Definition: zlib.h:119
stderr
FILE * stderr
LIT
Definition: inflate.c:183
HEAD
Definition: inflate.c:158
FAR
#define FAR
Definition: zlib.h:34
from
CardRegion * from
Definition: spigame.cpp:19
CODES
Definition: inflate.c:151
EXTRA
Definition: inflate.c:163
TABLE
Definition: inflate.c:174
unsigned
static unsigned(__cdecl *hash_bstr)(bstr_t s)
inflate_table
static int inflate_table(codetype type, unsigned short FAR *lens, unsigned codes, code FAR *FAR *table, unsigned FAR *bits, unsigned short FAR *work)
Definition: inflate.c:533
int
unsigned int(__cdecl typeof(jpeg_read_scanlines))(struct jpeg_decompress_struct *
Definition: typeof.h:31

Referenced by dwarf2_init_zsection(), ExtractZipImage(), gz_decomp(), MSZipCodecUncompress(), test_boundsrect(), CMSZipCodec::Uncompress(), uncompress2(), unzReadCurrentFile(), and zlib_decompress().

◆ inflate_fast()

static void inflate_fast ( z_streamp  strm,
unsigned  start 
)
static

Definition at line 274 of file inflate.c.

275 {
276  struct inflate_state FAR *state;
277  z_const unsigned char FAR *in; /* local strm->next_in */
278  z_const unsigned char FAR *last; /* have enough input while in < last */
279  unsigned char FAR *out; /* local strm->next_out */
280  unsigned char FAR *beg; /* inflate()'s initial strm->next_out */
281  unsigned char FAR *end; /* while out < end, enough space available */
282 #ifdef INFLATE_STRICT
283  unsigned dmax; /* maximum distance from zlib header */
284 #endif
285  unsigned wsize; /* window size or zero if not using window */
286  unsigned whave; /* valid bytes in the window */
287  unsigned wnext; /* window write index */
288  unsigned char FAR *window; /* allocated sliding window, if wsize != 0 */
289  unsigned long hold; /* local strm->hold */
290  unsigned bits; /* local strm->bits */
291  code const FAR *lcode; /* local strm->lencode */
292  code const FAR *dcode; /* local strm->distcode */
293  unsigned lmask; /* mask for first level of length codes */
294  unsigned dmask; /* mask for first level of distance codes */
295  code here; /* retrieved table entry */
296  unsigned op; /* code bits, operation, extra bits, or */
297  /* window position, window bytes to copy */
298  unsigned len; /* match length, unused bytes */
299  unsigned dist; /* match distance */
300  unsigned char FAR *from; /* where to copy match from */
301 
302  /* copy state to local variables */
303  state = (struct inflate_state FAR *)strm->state;
304  in = strm->next_in;
305  last = in + (strm->avail_in - 5);
306  out = strm->next_out;
307  beg = out - (start - strm->avail_out);
308  end = out + (strm->avail_out - 257);
309 #ifdef INFLATE_STRICT
310  dmax = state->dmax;
311 #endif
312  wsize = state->wsize;
313  whave = state->whave;
314  wnext = state->wnext;
315  window = state->window;
316  hold = state->hold;
317  bits = state->bits;
318  lcode = state->lencode;
319  dcode = state->distcode;
320  lmask = (1U << state->lenbits) - 1;
321  dmask = (1U << state->distbits) - 1;
322 
323  /* decode literals and length/distances until end-of-block or not enough
324  input data or output space */
325  do {
326  if (bits < 15) {
327  hold += (unsigned long)(*in++) << bits;
328  bits += 8;
329  hold += (unsigned long)(*in++) << bits;
330  bits += 8;
331  }
332  here = lcode[hold & lmask];
333  dolen:
334  op = (unsigned)(here.bits);
335  hold >>= op;
336  bits -= op;
337  op = (unsigned)(here.op);
338  if (op == 0) { /* literal */
339  Tracevv((stderr, here.val >= 0x20 && here.val < 0x7f ?
340  "inflate: literal '%c'\n" :
341  "inflate: literal 0x%02x\n", here.val));
342  *out++ = (unsigned char)(here.val);
343  }
344  else if (op & 16) { /* length base */
345  len = (unsigned)(here.val);
346  op &= 15; /* number of extra bits */
347  if (op) {
348  if (bits < op) {
349  hold += (unsigned long)(*in++) << bits;
350  bits += 8;
351  }
352  len += (unsigned)hold & ((1U << op) - 1);
353  hold >>= op;
354  bits -= op;
355  }
356  Tracevv((stderr, "inflate: length %u\n", len));
357  if (bits < 15) {
358  hold += (unsigned long)(*in++) << bits;
359  bits += 8;
360  hold += (unsigned long)(*in++) << bits;
361  bits += 8;
362  }
363  here = dcode[hold & dmask];
364  dodist:
365  op = (unsigned)(here.bits);
366  hold >>= op;
367  bits -= op;
368  op = (unsigned)(here.op);
369  if (op & 16) { /* distance base */
370  dist = (unsigned)(here.val);
371  op &= 15; /* number of extra bits */
372  if (bits < op) {
373  hold += (unsigned long)(*in++) << bits;
374  bits += 8;
375  if (bits < op) {
376  hold += (unsigned long)(*in++) << bits;
377  bits += 8;
378  }
379  }
380  dist += (unsigned)hold & ((1U << op) - 1);
381 #ifdef INFLATE_STRICT
382  if (dist > dmax) {
383  strm->msg = (char *)"invalid distance too far back";
384  state->mode = BAD;
385  break;
386  }
387 #endif
388  hold >>= op;
389  bits -= op;
390  Tracevv((stderr, "inflate: distance %u\n", dist));
391  op = (unsigned)(out - beg); /* max distance in output */
392  if (dist > op) { /* see if copy from window */
393  op = dist - op; /* distance back in window */
394  if (op > whave) {
395  if (state->sane) {
396  strm->msg =
397  (char *)"invalid distance too far back";
398  state->mode = BAD;
399  break;
400  }
401 #ifdef INFLATE_ALLOW_INVALID_DISTANCE_TOOFAR_ARRR
402  if (len <= op - whave) {
403  do {
404  *out++ = 0;
405  } while (--len);
406  continue;
407  }
408  len -= op - whave;
409  do {
410  *out++ = 0;
411  } while (--op > whave);
412  if (op == 0) {
413  from = out - dist;
414  do {
415  *out++ = *from++;
416  } while (--len);
417  continue;
418  }
419 #endif
420  }
421  from = window;
422  if (wnext == 0) { /* very common case */
423  from += wsize - op;
424  if (op < len) { /* some from window */
425  len -= op;
426  do {
427  *out++ = *from++;
428  } while (--op);
429  from = out - dist; /* rest from output */
430  }
431  }
432  else if (wnext < op) { /* wrap around window */
433  from += wsize + wnext - op;
434  op -= wnext;
435  if (op < len) { /* some from end of window */
436  len -= op;
437  do {
438  *out++ = *from++;
439  } while (--op);
440  from = window;
441  if (wnext < len) { /* some from start of window */
442  op = wnext;
443  len -= op;
444  do {
445  *out++ = *from++;
446  } while (--op);
447  from = out - dist; /* rest from output */
448  }
449  }
450  }
451  else { /* contiguous in window */
452  from += wnext - op;
453  if (op < len) { /* some from window */
454  len -= op;
455  do {
456  *out++ = *from++;
457  } while (--op);
458  from = out - dist; /* rest from output */
459  }
460  }
461  while (len > 2) {
462  *out++ = *from++;
463  *out++ = *from++;
464  *out++ = *from++;
465  len -= 3;
466  }
467  if (len) {
468  *out++ = *from++;
469  if (len > 1)
470  *out++ = *from++;
471  }
472  }
473  else {
474  from = out - dist; /* copy direct from output */
475  do { /* minimum length is three */
476  *out++ = *from++;
477  *out++ = *from++;
478  *out++ = *from++;
479  len -= 3;
480  } while (len > 2);
481  if (len) {
482  *out++ = *from++;
483  if (len > 1)
484  *out++ = *from++;
485  }
486  }
487  }
488  else if ((op & 64) == 0) { /* 2nd level distance code */
489  here = dcode[here.val + (hold & ((1U << op) - 1))];
490  goto dodist;
491  }
492  else {
493  strm->msg = (char *)"invalid distance code";
494  state->mode = BAD;
495  break;
496  }
497  }
498  else if ((op & 64) == 0) { /* 2nd level length code */
499  here = lcode[here.val + (hold & ((1U << op) - 1))];
500  goto dolen;
501  }
502  else if (op & 32) { /* end-of-block */
503  Tracevv((stderr, "inflate: end of block\n"));
504  state->mode = TYPE;
505  break;
506  }
507  else {
508  strm->msg = (char *)"invalid literal/length code";
509  state->mode = BAD;
510  break;
511  }
512  } while (in < last && out < end);
513 
514  /* return unused bytes (on entry, bits < 8, so in won't go too far back) */
515  len = bits >> 3;
516  in -= len;
517  bits -= len << 3;
518  hold &= (1U << bits) - 1;
519 
520  /* update state and return */
521  strm->next_in = in;
522  strm->next_out = out;
523  strm->avail_in = (unsigned)(in < last ? 5 + (last - in) : 5 - (in - last));
524  strm->avail_out = (unsigned)(out < end ?
525  257 + (end - out) : 257 - (out - end));
526  state->hold = hold;
527  state->bits = bits;
528  return;
529 }
code::val
unsigned short val
Definition: inflate.c:142
inflate_state
Definition: inflate.c:194
last
POINT last
Definition: font.c:46
inflate_state::wnext
unsigned wnext
Definition: inflate.c:210
U
#define U(x)
Definition: wordpad.c:45
inflate_state::strm
z_streamp strm
Definition: inflate.c:195
inflate_state::wsize
unsigned wsize
Definition: inflate.c:208
Tracevv
#define Tracevv(x)
Definition: inflate.c:44
end
GLuint GLuint end
Definition: gl.h:1545
bits
GLenum GLint GLenum GLsizei GLsizei GLsizei GLint GLsizei const GLvoid * bits
Definition: glext.h:10929
code::op
unsigned char op
Definition: inflate.c:140
BAD
Definition: inflate.c:187
char
unsigned char
Definition: typeof.h:29
inflate_state::hold
unsigned long hold
Definition: inflate.c:213
TYPE
Definition: inflate.c:169
out
static FILE * out
Definition: regtests2xml.c:44
op
UINT op
Definition: effect.c:224
code::bits
unsigned char bits
Definition: inflate.c:141
state
static int state
Definition: maze.c:121
len
GLenum GLsizei len
Definition: glext.h:6722
window
static IHTMLWindow2 * window
Definition: events.c:77
code
Definition: inflate.c:139
inflate_state::dmax
unsigned dmax
Definition: inflate.c:202
in
GLuint in
Definition: glext.h:9616
start
GLuint start
Definition: gl.h:1545
long
#define long
Definition: qsort.c:33
z_const
#define z_const
Definition: zlib.h:35
inflate_state::whave
unsigned whave
Definition: inflate.c:209
stderr
FILE * stderr
FAR
#define FAR
Definition: zlib.h:34
from
CardRegion * from
Definition: spigame.cpp:19
unsigned
static unsigned(__cdecl *hash_bstr)(bstr_t s)

Referenced by inflate().

◆ inflate_table()

static int inflate_table ( codetype  type,
unsigned short FAR *  lens,
unsigned  codes,
code FAR *FAR *  table,
unsigned FAR *  bits,
unsigned short FAR *  work 
)
static

Definition at line 533 of file inflate.c.

535 {
536  unsigned len; /* a code's length in bits */
537  unsigned sym; /* index of code symbols */
538  unsigned min, max; /* minimum and maximum code lengths */
539  unsigned root; /* number of index bits for root table */
540  unsigned curr; /* number of index bits for current table */
541  unsigned drop; /* code bits to drop for sub-table */
542  int left; /* number of prefix codes available */
543  unsigned used; /* code entries in table used */
544  unsigned huff; /* Huffman code */
545  unsigned incr; /* for incrementing code, index */
546  unsigned fill; /* index for replicating entries */
547  unsigned low; /* low bits for current root entry */
548  unsigned mask; /* mask for low root bits */
549  code here; /* table entry for duplication */
550  code FAR *next; /* next available space in table */
551  const unsigned short FAR *base; /* base value table to use */
552  const unsigned short FAR *extra; /* extra bits table to use */
553  unsigned match; /* use base and extra for symbol >= match */
554  unsigned short count[MAXBITS+1]; /* number of codes of each length */
555  unsigned short offs[MAXBITS+1]; /* offsets in table for each length */
556  static const unsigned short lbase[31] = { /* Length codes 257..285 base */
557  3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31,
558  35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258, 0, 0};
559  static const unsigned short lext[31] = { /* Length codes 257..285 extra */
560  16, 16, 16, 16, 16, 16, 16, 16, 17, 17, 17, 17, 18, 18, 18, 18,
561  19, 19, 19, 19, 20, 20, 20, 20, 21, 21, 21, 21, 16, 77, 202};
562  static const unsigned short dbase[32] = { /* Distance codes 0..29 base */
563  1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193,
564  257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, 6145,
565  8193, 12289, 16385, 24577, 0, 0};
566  static const unsigned short dext[32] = { /* Distance codes 0..29 extra */
567  16, 16, 16, 16, 17, 17, 18, 18, 19, 19, 20, 20, 21, 21, 22, 22,
568  23, 23, 24, 24, 25, 25, 26, 26, 27, 27,
569  28, 28, 29, 29, 64, 64};
570 
571  /*
572  Process a set of code lengths to create a canonical Huffman code. The
573  code lengths are lens[0..codes-1]. Each length corresponds to the
574  symbols 0..codes-1. The Huffman code is generated by first sorting the
575  symbols by length from short to long, and retaining the symbol order
576  for codes with equal lengths. Then the code starts with all zero bits
577  for the first code of the shortest length, and the codes are integer
578  increments for the same length, and zeros are appended as the length
579  increases. For the deflate format, these bits are stored backwards
580  from their more natural integer increment ordering, and so when the
581  decoding tables are built in the large loop below, the integer codes
582  are incremented backwards.
583 
584  This routine assumes, but does not check, that all of the entries in
585  lens[] are in the range 0..MAXBITS. The caller must assure this.
586  1..MAXBITS is interpreted as that code length. zero means that that
587  symbol does not occur in this code.
588 
589  The codes are sorted by computing a count of codes for each length,
590  creating from that a table of starting indices for each length in the
591  sorted table, and then entering the symbols in order in the sorted
592  table. The sorted table is work[], with that space being provided by
593  the caller.
594 
595  The length counts are used for other purposes as well, i.e. finding
596  the minimum and maximum length codes, determining if there are any
597  codes at all, checking for a valid set of lengths, and looking ahead
598  at length counts to determine sub-table sizes when building the
599  decoding tables.
600  */
601 
602  /* accumulate lengths for codes (assumes lens[] all in 0..MAXBITS) */
603  for (len = 0; len <= MAXBITS; len++)
604  count[len] = 0;
605  for (sym = 0; sym < codes; sym++)
606  count[lens[sym]]++;
607 
608  /* bound code lengths, force root to be within code lengths */
609  root = *bits;
610  for (max = MAXBITS; max >= 1; max--)
611  if (count[max] != 0) break;
612  if (root > max) root = max;
613  if (max == 0) { /* no symbols to code at all */
614  here.op = (unsigned char)64; /* invalid code marker */
615  here.bits = (unsigned char)1;
616  here.val = (unsigned short)0;
617  *(*table)++ = here; /* make a table to force an error */
618  *(*table)++ = here;
619  *bits = 1;
620  return 0; /* no symbols, but wait for decoding to report error */
621  }
622  for (min = 1; min < max; min++)
623  if (count[min] != 0) break;
624  if (root < min) root = min;
625 
626  /* check for an over-subscribed or incomplete set of lengths */
627  left = 1;
628  for (len = 1; len <= MAXBITS; len++) {
629  left <<= 1;
630  left -= count[len];
631  if (left < 0) return -1; /* over-subscribed */
632  }
633  if (left > 0 && (type == CODES || max != 1))
634  return -1; /* incomplete set */
635 
636  /* generate offsets into symbol table for each length for sorting */
637  offs[1] = 0;
638  for (len = 1; len < MAXBITS; len++)
639  offs[len + 1] = offs[len] + count[len];
640 
641  /* sort symbols by length, by symbol order within each length */
642  for (sym = 0; sym < codes; sym++)
643  if (lens[sym] != 0) work[offs[lens[sym]]++] = (unsigned short)sym;
644 
645  /*
646  Create and fill in decoding tables. In this loop, the table being
647  filled is at next and has curr index bits. The code being used is huff
648  with length len. That code is converted to an index by dropping drop
649  bits off of the bottom. For codes where len is less than drop + curr,
650  those top drop + curr - len bits are incremented through all values to
651  fill the table with replicated entries.
652 
653  root is the number of index bits for the root table. When len exceeds
654  root, sub-tables are created pointed to by the root entry with an index
655  of the low root bits of huff. This is saved in low to check for when a
656  new sub-table should be started. drop is zero when the root table is
657  being filled, and drop is root when sub-tables are being filled.
658 
659  When a new sub-table is needed, it is necessary to look ahead in the
660  code lengths to determine what size sub-table is needed. The length
661  counts are used for this, and so count[] is decremented as codes are
662  entered in the tables.
663 
664  used keeps track of how many table entries have been allocated from the
665  provided *table space. It is checked for LENS and DIST tables against
666  the constants ENOUGH_LENS and ENOUGH_DISTS to guard against changes in
667  the initial root table size constants. See the comments in inftrees.h
668  for more information.
669 
670  sym increments through all symbols, and the loop terminates when
671  all codes of length max, i.e. all codes, have been processed. This
672  routine permits incomplete codes, so another loop after this one fills
673  in the rest of the decoding tables with invalid code markers.
674  */
675 
676  /* set up for code type */
677  switch (type) {
678  case CODES:
679  base = extra = work; /* dummy value--not used */
680  match = 20;
681  break;
682  case LENS:
683  base = lbase;
684  extra = lext;
685  match = 257;
686  break;
687  default: /* DISTS */
688  base = dbase;
689  extra = dext;
690  match = 0;
691  }
692 
693  /* initialize state for loop */
694  huff = 0; /* starting code */
695  sym = 0; /* starting code symbol */
696  len = min; /* starting code length */
697  next = *table; /* current table to fill in */
698  curr = root; /* current table index bits */
699  drop = 0; /* current bits to drop from code for index */
700  low = (unsigned)(-1); /* trigger new sub-table when len > root */
701  used = 1U << root; /* use root table entries */
702  mask = used - 1; /* mask for comparing low */
703 
704  /* check available table space */
705  if ((type == LENS && used > ENOUGH_LENS) ||
706  (type == DISTS && used > ENOUGH_DISTS))
707  return 1;
708 
709  /* process all codes and make table entries */
710  for (;;) {
711  /* create table entry */
712  here.bits = (unsigned char)(len - drop);
713  if (work[sym] + 1U < match) {
714  here.op = (unsigned char)0;
715  here.val = work[sym];
716  }
717  else if (work[sym] >= match) {
718  here.op = (unsigned char)(extra[work[sym] - match]);
719  here.val = base[work[sym] - match];
720  }
721  else {
722  here.op = (unsigned char)(32 + 64); /* end of block */
723  here.val = 0;
724  }
725 
726  /* replicate for those indices with low len bits equal to huff */
727  incr = 1U << (len - drop);
728  fill = 1U << curr;
729  min = fill; /* save offset to next table */
730  do {
731  fill -= incr;
732  next[(huff >> drop) + fill] = here;
733  } while (fill != 0);
734 
735  /* backwards increment the len-bit code huff */
736  incr = 1U << (len - 1);
737  while (huff & incr)
738  incr >>= 1;
739  if (incr != 0) {
740  huff &= incr - 1;
741  huff += incr;
742  }
743  else
744  huff = 0;
745 
746  /* go to next symbol, update count, len */
747  sym++;
748  if (--(count[len]) == 0) {
749  if (len == max) break;
750  len = lens[work[sym]];
751  }
752 
753  /* create new sub-table if needed */
754  if (len > root && (huff & mask) != low) {
755  /* if first time, transition to sub-tables */
756  if (drop == 0)
757  drop = root;
758 
759  /* increment past last table */
760  next += min; /* here min is 1 << curr */
761 
762  /* determine length of next table */
763  curr = len - drop;
764  left = (int)(1 << curr);
765  while (curr + drop < max) {
766  left -= count[curr + drop];
767  if (left <= 0) break;
768  curr++;
769  left <<= 1;
770  }
771 
772  /* check for enough space */
773  used += 1U << curr;
774  if ((type == LENS && used > ENOUGH_LENS) ||
775  (type == DISTS && used > ENOUGH_DISTS))
776  return 1;
777 
778  /* point entry in root table to sub-table */
779  low = huff & mask;
780  (*table)[low].op = (unsigned char)curr;
781  (*table)[low].bits = (unsigned char)root;
782  (*table)[low].val = (unsigned short)(next - *table);
783  }
784  }
785 
786  /* fill in remaining table entry if code is incomplete (guaranteed to have
787  at most one remaining entry, since if the code is incomplete, the
788  maximum code length that was allowed to get this far is one bit) */
789  if (huff != 0) {
790  here.op = (unsigned char)64; /* invalid code marker */
791  here.bits = (unsigned char)(len - drop);
792  here.val = (unsigned short)0;
793  next[huff] = here;
794  }
795 
796  /* set return parameters */
797  *table += used;
798  *bits = root;
799  return 0;
800 }
LENS
Definition: inflate.c:152
code::val
unsigned short val
Definition: inflate.c:142
max
#define max(a, b)
Definition: svc.c:63
inflate_state::work
unsigned short work[288]
Definition: inflate.c:232
match
Definition: match.c:28
count
GLuint GLuint GLsizei count
Definition: gl.h:1545
root
struct _root root
U
#define U(x)
Definition: wordpad.c:45
type
GLuint GLuint GLsizei GLenum type
Definition: gl.h:1545
table
GLenum GLsizei GLenum GLenum const GLvoid * table
Definition: glext.h:5644
ENOUGH_DISTS
#define ENOUGH_DISTS
Definition: inflate.c:146
bits
GLenum GLint GLenum GLsizei GLsizei GLsizei GLint GLsizei const GLvoid * bits
Definition: glext.h:10929
code::op
unsigned char op
Definition: inflate.c:140
short
unsigned short(__cdecl typeof(TIFFCurrentDirectory))(struct tiff *)
Definition: typeof.h:94
mask
GLenum GLint GLuint mask
Definition: glext.h:6028
base
GLuint base
Definition: 3dtext.c:35
char
unsigned char
Definition: typeof.h:29
match
struct match match
Definition: match.c:33
ENOUGH_LENS
#define ENOUGH_LENS
Definition: inflate.c:145
used
c used
Definition: write.c:2857
extra
Definition: id3.c:95
fill
_STLP_MOVE_TO_STD_NAMESPACE void fill(_ForwardIter __first, _ForwardIter __last, const _Tp &__val)
Definition: _algobase.h:449
left
GLint left
Definition: glext.h:7726
inflate_state::lens
unsigned short lens[320]
Definition: inflate.c:231
inflate_state::codes
code codes[ENOUGH]
Definition: inflate.c:233
code::bits
unsigned char bits
Definition: inflate.c:141
DISTS
Definition: inflate.c:153
_root
Definition: btrfs_drv.h:466
len
GLenum GLsizei len
Definition: glext.h:6722
code
Definition: inflate.c:139
next
static unsigned __int64 next
Definition: rand_nt.c:6
min
#define min(a, b)
Definition: monoChain.cc:55
FAR
#define FAR
Definition: zlib.h:34
CODES
Definition: inflate.c:151
MAXBITS
#define MAXBITS
Definition: inflate.c:531
unsigned
static unsigned(__cdecl *hash_bstr)(bstr_t s)
int
unsigned int(__cdecl typeof(jpeg_read_scanlines))(struct jpeg_decompress_struct *
Definition: typeof.h:31

Referenced by inflate().

◆ inflateEnd()

int inflateEnd ( z_streamp  strm)

Definition at line 1910 of file inflate.c.

1911 {
1912  struct inflate_state FAR *state;
1913  if (inflateStateCheck(strm))
1914  return Z_STREAM_ERROR;
1915  state = (struct inflate_state FAR *)strm->state;
1916  if (state->window != Z_NULL) ZFREE(strm, state->window);
1917  ZFREE(strm, strm->state);
1918  strm->state = Z_NULL;
1919  Tracev((stderr, "inflate: end\n"));
1920  return Z_OK;
1921 }
inflate_state
Definition: inflate.c:194
Z_STREAM_ERROR
#define Z_STREAM_ERROR
Definition: zlib.h:118
Z_OK
#define Z_OK
Definition: zlib.h:114
inflate_state::strm
z_streamp strm
Definition: inflate.c:195
ZFREE
#define ZFREE(strm, addr)
Definition: inflate.c:51
inflateStateCheck
static int inflateStateCheck(z_streamp strm)
Definition: inflate.c:802
Tracev
#define Tracev(x)
Definition: inflate.c:43
if
if(!(yy_init))
Definition: macro.lex.yy.c:714
state
static int state
Definition: maze.c:121
Z_NULL
#define Z_NULL
Definition: zlib.h:149
stderr
FILE * stderr
FAR
#define FAR
Definition: zlib.h:34

Referenced by dwarf2_init_zsection(), ExtractZipImage(), gzclose_r(), MSZipCodecUncompress(), CMSZipCodec::Uncompress(), uncompress2(), unzCloseCurrentFile(), and zlib_decompress().

◆ inflateInit()

int inflateInit ( z_streamp  strm)

Definition at line 909 of file inflate.c.

910 {
911  return inflateInit2(strm, DEF_WBITS);
912 }
inflate_state::strm
z_streamp strm
Definition: inflate.c:195
inflateInit2
int inflateInit2(z_streamp strm, int windowBits)
Definition: inflate.c:887
DEF_WBITS
#define DEF_WBITS
Definition: inflate.c:37

◆ inflateInit2()

int inflateInit2 ( z_streamp  strm,
int  windowBits 
)

Definition at line 887 of file inflate.c.

888 {
889  int ret;
890  struct inflate_state FAR *state;
891 
892  strm->msg = Z_NULL; /* in case we return an error */
893  state = (struct inflate_state FAR *)
894  ZALLOC(strm, 1, sizeof(struct inflate_state));
895  if (state == Z_NULL) return Z_MEM_ERROR;
896  Tracev((stderr, "inflate: allocated\n"));
897  strm->state = (struct internal_state FAR *)state;
898  state->strm = strm;
899  state->window = Z_NULL;
900  state->mode = HEAD; /* to pass state test in inflateReset2() */
901  ret = inflateReset2(strm, windowBits);
902  if (ret != Z_OK) {
903  ZFREE(strm, state);
904  strm->state = Z_NULL;
905  }
906  return ret;
907 }
windowBits
int windowBits
Definition: zlib.h:813
inflate_state
Definition: inflate.c:194
Z_OK
#define Z_OK
Definition: zlib.h:114
inflate_state::strm
z_streamp strm
Definition: inflate.c:195
ZFREE
#define ZFREE(strm, addr)
Definition: inflate.c:51
internal_state::strm
z_streamp strm
Definition: deflate.h:101
Tracev
#define Tracev(x)
Definition: inflate.c:43
ret
int ret
Definition: wcstombs-tests.c:31
state
static int state
Definition: maze.c:121
ZALLOC
#define ZALLOC(strm, items, size)
Definition: inflate.c:49
Z_NULL
#define Z_NULL
Definition: zlib.h:149
internal_state
Definition: inflate.c:30
Z_MEM_ERROR
#define Z_MEM_ERROR
Definition: zlib.h:120
stderr
FILE * stderr
HEAD
Definition: inflate.c:158
FAR
#define FAR
Definition: zlib.h:34
inflateReset2
static int inflateReset2(z_streamp strm, int windowBits)
Definition: inflate.c:851

Referenced by inflateInit().

◆ inflateReset()

static int inflateReset ( z_streamp  strm)
static

Definition at line 839 of file inflate.c.

840 {
841  struct inflate_state FAR *state;
842 
843  if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
844  state = (struct inflate_state FAR *)strm->state;
845  state->wsize = 0;
846  state->whave = 0;
847  state->wnext = 0;
848  return inflateResetKeep(strm);
849 }
inflate_state
Definition: inflate.c:194
Z_STREAM_ERROR
#define Z_STREAM_ERROR
Definition: zlib.h:118
inflateResetKeep
static int inflateResetKeep(z_streamp strm)
Definition: inflate.c:815
inflate_state::strm
z_streamp strm
Definition: inflate.c:195
inflateStateCheck
static int inflateStateCheck(z_streamp strm)
Definition: inflate.c:802
state
static int state
Definition: maze.c:121
FAR
#define FAR
Definition: zlib.h:34

Referenced by inflateReset2().

◆ inflateReset2()

static int inflateReset2 ( z_streamp  strm,
int  windowBits 
)
static

Definition at line 851 of file inflate.c.

852 {
853  int wrap;
854  struct inflate_state FAR *state;
855 
856  /* get the state */
857  if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
858  state = (struct inflate_state FAR *)strm->state;
859 
860  /* extract wrap request from windowBits parameter */
861  if (windowBits < 0) {
862  wrap = 0;
863  windowBits = -windowBits;
864  }
865  else {
866  wrap = (windowBits >> 4) + 5;
867 #ifdef GUNZIP
868  if (windowBits < 48)
869  windowBits &= 15;
870 #endif
871  }
872 
873  /* set number of window bits, free window if different */
874  if (windowBits && (windowBits < 8 || windowBits > 15))
875  return Z_STREAM_ERROR;
876  if (state->window != Z_NULL && state->wbits != (unsigned)windowBits) {
877  ZFREE(strm, state->window);
878  state->window = Z_NULL;
879  }
880 
881  /* update state and reset the rest of it */
882  state->wrap = wrap;
883  state->wbits = (unsigned)windowBits;
884  return inflateReset(strm);
885 }
windowBits
int windowBits
Definition: zlib.h:813
inflate_state
Definition: inflate.c:194
Z_STREAM_ERROR
#define Z_STREAM_ERROR
Definition: zlib.h:118
inflate_state::strm
z_streamp strm
Definition: inflate.c:195
ZFREE
#define ZFREE(strm, addr)
Definition: inflate.c:51
inflateStateCheck
static int inflateStateCheck(z_streamp strm)
Definition: inflate.c:802
if
if(!(yy_init))
Definition: macro.lex.yy.c:714
state
static int state
Definition: maze.c:121
Z_NULL
#define Z_NULL
Definition: zlib.h:149
inflateReset
static int inflateReset(z_streamp strm)
Definition: inflate.c:839
wrap
#define wrap(journal, var)
Definition: recovery.c:207
FAR
#define FAR
Definition: zlib.h:34
unsigned
static unsigned(__cdecl *hash_bstr)(bstr_t s)

Referenced by inflateInit2().

◆ inflateResetKeep()

static int inflateResetKeep ( z_streamp  strm)
static

Definition at line 815 of file inflate.c.

816 {
817  struct inflate_state FAR *state;
818 
819  if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
820  state = (struct inflate_state FAR *)strm->state;
821  strm->total_in = strm->total_out = state->total = 0;
822  strm->msg = Z_NULL;
823  if (state->wrap) /* to support ill-conceived Java test suite */
824  strm->adler = state->wrap & 1;
825  state->mode = HEAD;
826  state->last = 0;
827  state->havedict = 0;
828  state->dmax = 32768U;
829  state->head = Z_NULL;
830  state->hold = 0;
831  state->bits = 0;
832  state->lencode = state->distcode = state->next = state->codes;
833  state->sane = 1;
834  state->back = -1;
835  Tracev((stderr, "inflate: reset\n"));
836  return Z_OK;
837 }
inflate_state
Definition: inflate.c:194
Z_STREAM_ERROR
#define Z_STREAM_ERROR
Definition: zlib.h:118
Z_OK
#define Z_OK
Definition: zlib.h:114
U
#define U(x)
Definition: wordpad.c:45
inflate_state::strm
z_streamp strm
Definition: inflate.c:195
inflateStateCheck
static int inflateStateCheck(z_streamp strm)
Definition: inflate.c:802
Tracev
#define Tracev(x)
Definition: inflate.c:43
if
if(!(yy_init))
Definition: macro.lex.yy.c:714
state
static int state
Definition: maze.c:121
Z_NULL
#define Z_NULL
Definition: zlib.h:149
stderr
FILE * stderr
HEAD
Definition: inflate.c:158
FAR
#define FAR
Definition: zlib.h:34

Referenced by inflateReset().

◆ inflateStateCheck()

static int inflateStateCheck ( z_streamp  strm)
static

Definition at line 802 of file inflate.c.

803 {
804  struct inflate_state FAR *state;
805  if (strm == Z_NULL ||
806  strm->zalloc == (alloc_func)0 || strm->zfree == (free_func)0)
807  return 1;
808  state = (struct inflate_state FAR *)strm->state;
809  if (state == Z_NULL || state->strm != strm ||
810  state->mode < HEAD || state->mode > SYNC)
811  return 1;
812  return 0;
813 }
inflate_state
Definition: inflate.c:194
inflate_state::strm
z_streamp strm
Definition: inflate.c:195
_HEAD
Definition: ntuser.h:174
free_func
void(* free_func)(voidpf opaque, voidpf address)
Definition: zlib.h:54
if
if(!(yy_init))
Definition: macro.lex.yy.c:714
state
static int state
Definition: maze.c:121
Z_NULL
#define Z_NULL
Definition: zlib.h:149
SYNC
Definition: inflate.c:189
alloc_func
voidpf(* alloc_func)(voidpf opaque, uInt items, uInt size)
Definition: zlib.h:53
FAR
#define FAR
Definition: zlib.h:34

Referenced by inflate(), inflateEnd(), inflateReset(), inflateReset2(), and inflateResetKeep().

◆ updatewindow()

static int updatewindow ( z_streamp  strm,
const Bytef *  end,
unsigned  copy 
)
static

Definition at line 1032 of file inflate.c.

1033 {
1034  struct inflate_state FAR *state;
1035  unsigned dist;
1036 
1037  state = (struct inflate_state FAR *)strm->state;
1038 
1039  /* if it hasn't been done already, allocate space for the window */
1040  if (state->window == Z_NULL) {
1041  state->window = (unsigned char FAR *)
1042  ZALLOC(strm, 1U << state->wbits,
1043  sizeof(unsigned char));
1044  if (state->window == Z_NULL) return 1;
1045  }
1046 
1047  /* if window not in use yet, initialize */
1048  if (state->wsize == 0) {
1049  state->wsize = 1U << state->wbits;
1050  state->wnext = 0;
1051  state->whave = 0;
1052  }
1053 
1054  /* copy state->wsize or less output bytes into the circular window */
1055  if (copy >= state->wsize) {
1056  zmemcpy(state->window, end - state->wsize, state->wsize);
1057  state->wnext = 0;
1058  state->whave = state->wsize;
1059  }
1060  else {
1061  dist = state->wsize - state->wnext;
1062  if (dist > copy) dist = copy;
1063  zmemcpy(state->window + state->wnext, end - copy, dist);
1064  copy -= dist;
1065  if (copy) {
1066  zmemcpy(state->window, end - copy, copy);
1067  state->wnext = copy;
1068  state->whave = state->wsize;
1069  }
1070  else {
1071  state->wnext += dist;
1072  if (state->wnext == state->wsize) state->wnext = 0;
1073  if (state->whave < state->wsize) state->whave += dist;
1074  }
1075  }
1076  return 0;
1077 }
inflate_state
Definition: inflate.c:194
U
#define U(x)
Definition: wordpad.c:45
inflate_state::strm
z_streamp strm
Definition: inflate.c:195
end
GLuint GLuint end
Definition: gl.h:1545
zmemcpy
#define zmemcpy
Definition: inflate.c:38
if
if(!(yy_init))
Definition: macro.lex.yy.c:714
state
static int state
Definition: maze.c:121
ZALLOC
#define ZALLOC(strm, items, size)
Definition: inflate.c:49
Z_NULL
#define Z_NULL
Definition: zlib.h:149
copy
INT copy(TCHAR source[MAX_PATH], TCHAR dest[MAX_PATH], INT append, DWORD lpdwFlags, BOOL bTouch)
Definition: copy.c:51
FAR
#define FAR
Definition: zlib.h:34

Referenced by inflate().