Wei Chang Shen / DMemWin

Dependencies:   emwin_lib

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png/inflate.c@4:20387dbf7ecf, 2016-06-02 (annotated)

Committer:
destinyXfate
Date:
Thu Jun 02 04:55:08 2016 +0000
Revision:
4:20387dbf7ecf
Parent:
2:0e2ef1edf01b 
;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
destinyXfate 2:0e2ef1edf01b 1 /* inflate.c -- zlib decompression
destinyXfate 2:0e2ef1edf01b 2 * Copyright (C) 1995-2005 Mark Adler
destinyXfate 2:0e2ef1edf01b 3 * For conditions of distribution and use, see copyright notice in zlib.h
destinyXfate 2:0e2ef1edf01b 4 */
destinyXfate 2:0e2ef1edf01b 5
destinyXfate 2:0e2ef1edf01b 6 /*
destinyXfate 2:0e2ef1edf01b 7 * Change history:
destinyXfate 2:0e2ef1edf01b 8 *
destinyXfate 2:0e2ef1edf01b 9 * 1.2.beta0 24 Nov 2002
destinyXfate 2:0e2ef1edf01b 10 * - First version -- complete rewrite of inflate to simplify code, avoid
destinyXfate 2:0e2ef1edf01b 11 * creation of window when not needed, minimize use of window when it is
destinyXfate 2:0e2ef1edf01b 12 * needed, make inffast.c even faster, implement gzip decoding, and to
destinyXfate 2:0e2ef1edf01b 13 * improve code readability and style over the previous zlib inflate code
destinyXfate 2:0e2ef1edf01b 14 *
destinyXfate 2:0e2ef1edf01b 15 * 1.2.beta1 25 Nov 2002
destinyXfate 2:0e2ef1edf01b 16 * - Use pointers for available input and output checking in inffast.c
destinyXfate 2:0e2ef1edf01b 17 * - Remove input and output counters in inffast.c
destinyXfate 2:0e2ef1edf01b 18 * - Change inffast.c entry and loop from avail_in >= 7 to >= 6
destinyXfate 2:0e2ef1edf01b 19 * - Remove unnecessary second byte pull from length extra in inffast.c
destinyXfate 2:0e2ef1edf01b 20 * - Unroll direct copy to three copies per loop in inffast.c
destinyXfate 2:0e2ef1edf01b 21 *
destinyXfate 2:0e2ef1edf01b 22 * 1.2.beta2 4 Dec 2002
destinyXfate 2:0e2ef1edf01b 23 * - Change external routine names to reduce potential conflicts
destinyXfate 2:0e2ef1edf01b 24 * - Correct filename to inffixed.h for fixed tables in inflate.c
destinyXfate 2:0e2ef1edf01b 25 * - Make hbuf[] unsigned char to match parameter type in inflate.c
destinyXfate 2:0e2ef1edf01b 26 * - Change strm->next_out[-state->offset] to *(strm->next_out - state->offset)
destinyXfate 2:0e2ef1edf01b 27 * to avoid negation problem on Alphas (64 bit) in inflate.c
destinyXfate 2:0e2ef1edf01b 28 *
destinyXfate 2:0e2ef1edf01b 29 * 1.2.beta3 22 Dec 2002
destinyXfate 2:0e2ef1edf01b 30 * - Add comments on state->bits assertion in inffast.c
destinyXfate 2:0e2ef1edf01b 31 * - Add comments on op field in inftrees.h
destinyXfate 2:0e2ef1edf01b 32 * - Fix bug in reuse of allocated window after inflateReset()
destinyXfate 2:0e2ef1edf01b 33 * - Remove bit fields--back to byte structure for speed
destinyXfate 2:0e2ef1edf01b 34 * - Remove distance extra == 0 check in inflate_fast()--only helps for lengths
destinyXfate 2:0e2ef1edf01b 35 * - Change post-increments to pre-increments in inflate_fast(), PPC biased?
destinyXfate 2:0e2ef1edf01b 36 * - Add compile time option, POSTINC, to use post-increments instead (Intel?)
destinyXfate 2:0e2ef1edf01b 37 * - Make MATCH copy in inflate() much faster for when inflate_fast() not used
destinyXfate 2:0e2ef1edf01b 38 * - Use local copies of stream next and avail values, as well as local bit
destinyXfate 2:0e2ef1edf01b 39 * buffer and bit count in inflate()--for speed when inflate_fast() not used
destinyXfate 2:0e2ef1edf01b 40 *
destinyXfate 2:0e2ef1edf01b 41 * 1.2.beta4 1 Jan 2003
destinyXfate 2:0e2ef1edf01b 42 * - Split ptr - 257 statements in inflate_table() to avoid compiler warnings
destinyXfate 2:0e2ef1edf01b 43 * - Move a comment on output buffer sizes from inffast.c to inflate.c
destinyXfate 2:0e2ef1edf01b 44 * - Add comments in inffast.c to introduce the inflate_fast() routine
destinyXfate 2:0e2ef1edf01b 45 * - Rearrange window copies in inflate_fast() for speed and simplification
destinyXfate 2:0e2ef1edf01b 46 * - Unroll last copy for window match in inflate_fast()
destinyXfate 2:0e2ef1edf01b 47 * - Use local copies of window variables in inflate_fast() for speed
destinyXfate 2:0e2ef1edf01b 48 * - Pull out common write == 0 case for speed in inflate_fast()
destinyXfate 2:0e2ef1edf01b 49 * - Make op and len in inflate_fast() unsigned for consistency
destinyXfate 2:0e2ef1edf01b 50 * - Add FAR to lcode and dcode declarations in inflate_fast()
destinyXfate 2:0e2ef1edf01b 51 * - Simplified bad distance check in inflate_fast()
destinyXfate 2:0e2ef1edf01b 52 * - Added inflateBackInit(), inflateBack(), and inflateBackEnd() in new
destinyXfate 2:0e2ef1edf01b 53 * source file infback.c to provide a call-back interface to inflate for
destinyXfate 2:0e2ef1edf01b 54 * programs like gzip and unzip -- uses window as output buffer to avoid
destinyXfate 2:0e2ef1edf01b 55 * window copying
destinyXfate 2:0e2ef1edf01b 56 *
destinyXfate 2:0e2ef1edf01b 57 * 1.2.beta5 1 Jan 2003
destinyXfate 2:0e2ef1edf01b 58 * - Improved inflateBack() interface to allow the caller to provide initial
destinyXfate 2:0e2ef1edf01b 59 * input in strm.
destinyXfate 2:0e2ef1edf01b 60 * - Fixed stored blocks bug in inflateBack()
destinyXfate 2:0e2ef1edf01b 61 *
destinyXfate 2:0e2ef1edf01b 62 * 1.2.beta6 4 Jan 2003
destinyXfate 2:0e2ef1edf01b 63 * - Added comments in inffast.c on effectiveness of POSTINC
destinyXfate 2:0e2ef1edf01b 64 * - Typecasting all around to reduce compiler warnings
destinyXfate 2:0e2ef1edf01b 65 * - Changed loops from while (1) or do {} while (1) to for (;;), again to
destinyXfate 2:0e2ef1edf01b 66 * make compilers happy
destinyXfate 2:0e2ef1edf01b 67 * - Changed type of window in inflateBackInit() to unsigned char *
destinyXfate 2:0e2ef1edf01b 68 *
destinyXfate 2:0e2ef1edf01b 69 * 1.2.beta7 27 Jan 2003
destinyXfate 2:0e2ef1edf01b 70 * - Changed many types to unsigned or unsigned short to avoid warnings
destinyXfate 2:0e2ef1edf01b 71 * - Added inflateCopy() function
destinyXfate 2:0e2ef1edf01b 72 *
destinyXfate 2:0e2ef1edf01b 73 * 1.2.0 9 Mar 2003
destinyXfate 2:0e2ef1edf01b 74 * - Changed inflateBack() interface to provide separate opaque descriptors
destinyXfate 2:0e2ef1edf01b 75 * for the in() and out() functions
destinyXfate 2:0e2ef1edf01b 76 * - Changed inflateBack() argument and in_func typedef to swap the length
destinyXfate 2:0e2ef1edf01b 77 * and buffer address return values for the input function
destinyXfate 2:0e2ef1edf01b 78 * - Check next_in and next_out for Z_NULL on entry to inflate()
destinyXfate 2:0e2ef1edf01b 79 *
destinyXfate 2:0e2ef1edf01b 80 * The history for versions after 1.2.0 are in ChangeLog in zlib distribution.
destinyXfate 2:0e2ef1edf01b 81 */
destinyXfate 2:0e2ef1edf01b 82
destinyXfate 2:0e2ef1edf01b 83 #include "zutil.h"
destinyXfate 2:0e2ef1edf01b 84 #include "inftrees.h"
destinyXfate 2:0e2ef1edf01b 85 #include "inflate.h"
destinyXfate 2:0e2ef1edf01b 86 #include "inffast.h"
destinyXfate 2:0e2ef1edf01b 87
destinyXfate 2:0e2ef1edf01b 88 #ifdef MAKEFIXED
destinyXfate 2:0e2ef1edf01b 89 # ifndef BUILDFIXED
destinyXfate 2:0e2ef1edf01b 90 # define BUILDFIXED
destinyXfate 2:0e2ef1edf01b 91 # endif
destinyXfate 2:0e2ef1edf01b 92 #endif
destinyXfate 2:0e2ef1edf01b 93
destinyXfate 2:0e2ef1edf01b 94 /* function prototypes */
destinyXfate 2:0e2ef1edf01b 95 local void fixedtables OF((struct inflate_state FAR *state));
destinyXfate 2:0e2ef1edf01b 96 local int updatewindow OF((z_streamp strm, unsigned out));
destinyXfate 2:0e2ef1edf01b 97 #ifdef BUILDFIXED
destinyXfate 2:0e2ef1edf01b 98 void makefixed OF((void));
destinyXfate 2:0e2ef1edf01b 99 #endif
destinyXfate 2:0e2ef1edf01b 100 local unsigned syncsearch OF((unsigned FAR *have, unsigned char FAR *buf,
destinyXfate 2:0e2ef1edf01b 101 unsigned len));
destinyXfate 2:0e2ef1edf01b 102
destinyXfate 2:0e2ef1edf01b 103 int ZEXPORT inflateReset(strm)
destinyXfate 2:0e2ef1edf01b 104 z_streamp strm;
destinyXfate 2:0e2ef1edf01b 105 {
destinyXfate 2:0e2ef1edf01b 106 struct inflate_state FAR *state;
destinyXfate 2:0e2ef1edf01b 107
destinyXfate 2:0e2ef1edf01b 108 if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR;
destinyXfate 2:0e2ef1edf01b 109 state = (struct inflate_state FAR *)strm->state;
destinyXfate 2:0e2ef1edf01b 110 strm->total_in = strm->total_out = state->total = 0;
destinyXfate 2:0e2ef1edf01b 111 strm->msg = Z_NULL;
destinyXfate 2:0e2ef1edf01b 112 strm->adler = 1; /* to support ill-conceived Java test suite */
destinyXfate 2:0e2ef1edf01b 113 state->mode = HEAD;
destinyXfate 2:0e2ef1edf01b 114 state->last = 0;
destinyXfate 2:0e2ef1edf01b 115 state->havedict = 0;
destinyXfate 2:0e2ef1edf01b 116 state->dmax = 32768U;
destinyXfate 2:0e2ef1edf01b 117 state->head = Z_NULL;
destinyXfate 2:0e2ef1edf01b 118 state->wsize = 0;
destinyXfate 2:0e2ef1edf01b 119 state->whave = 0;
destinyXfate 2:0e2ef1edf01b 120 state->write = 0;
destinyXfate 2:0e2ef1edf01b 121 state->hold = 0;
destinyXfate 2:0e2ef1edf01b 122 state->bits = 0;
destinyXfate 2:0e2ef1edf01b 123 state->lencode = state->distcode = state->next = state->codes;
destinyXfate 2:0e2ef1edf01b 124 Tracev((stderr, "inflate: reset\n"));
destinyXfate 2:0e2ef1edf01b 125 return Z_OK;
destinyXfate 2:0e2ef1edf01b 126 }
destinyXfate 2:0e2ef1edf01b 127
destinyXfate 2:0e2ef1edf01b 128 int ZEXPORT inflatePrime(strm, bits, value)
destinyXfate 2:0e2ef1edf01b 129 z_streamp strm;
destinyXfate 2:0e2ef1edf01b 130 int bits;
destinyXfate 2:0e2ef1edf01b 131 int value;
destinyXfate 2:0e2ef1edf01b 132 {
destinyXfate 2:0e2ef1edf01b 133 struct inflate_state FAR *state;
destinyXfate 2:0e2ef1edf01b 134
destinyXfate 2:0e2ef1edf01b 135 if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR;
destinyXfate 2:0e2ef1edf01b 136 state = (struct inflate_state FAR *)strm->state;
destinyXfate 2:0e2ef1edf01b 137 if (bits > 16 || state->bits + bits > 32) return Z_STREAM_ERROR;
destinyXfate 2:0e2ef1edf01b 138 value &= (1L << bits) - 1;
destinyXfate 2:0e2ef1edf01b 139 state->hold += value << state->bits;
destinyXfate 2:0e2ef1edf01b 140 state->bits += bits;
destinyXfate 2:0e2ef1edf01b 141 return Z_OK;
destinyXfate 2:0e2ef1edf01b 142 }
destinyXfate 2:0e2ef1edf01b 143
destinyXfate 2:0e2ef1edf01b 144 int ZEXPORT inflateInit2_(strm, windowBits, version, stream_size)
destinyXfate 2:0e2ef1edf01b 145 z_streamp strm;
destinyXfate 2:0e2ef1edf01b 146 int windowBits;
destinyXfate 2:0e2ef1edf01b 147 const char *version;
destinyXfate 2:0e2ef1edf01b 148 int stream_size;
destinyXfate 2:0e2ef1edf01b 149 {
destinyXfate 2:0e2ef1edf01b 150 struct inflate_state FAR *state;
destinyXfate 2:0e2ef1edf01b 151
destinyXfate 2:0e2ef1edf01b 152 if (version == Z_NULL || version[0] != ZLIB_VERSION[0] ||
destinyXfate 2:0e2ef1edf01b 153 stream_size != (int)(sizeof(z_stream)))
destinyXfate 2:0e2ef1edf01b 154 return Z_VERSION_ERROR;
destinyXfate 2:0e2ef1edf01b 155 if (strm == Z_NULL) return Z_STREAM_ERROR;
destinyXfate 2:0e2ef1edf01b 156 strm->msg = Z_NULL; /* in case we return an error */
destinyXfate 2:0e2ef1edf01b 157 if (strm->zalloc == (alloc_func)0) {
destinyXfate 2:0e2ef1edf01b 158 strm->zalloc = zcalloc;
destinyXfate 2:0e2ef1edf01b 159 strm->opaque = (voidpf)0;
destinyXfate 2:0e2ef1edf01b 160 }
destinyXfate 2:0e2ef1edf01b 161 if (strm->zfree == (free_func)0) strm->zfree = zcfree;
destinyXfate 2:0e2ef1edf01b 162 state = (struct inflate_state FAR *)
destinyXfate 2:0e2ef1edf01b 163 ZALLOC(strm, 1, sizeof(struct inflate_state));
destinyXfate 2:0e2ef1edf01b 164 if (state == Z_NULL) return Z_MEM_ERROR;
destinyXfate 2:0e2ef1edf01b 165 Tracev((stderr, "inflate: allocated\n"));
destinyXfate 2:0e2ef1edf01b 166 strm->state = (struct internal_state FAR *)state;
destinyXfate 2:0e2ef1edf01b 167 if (windowBits < 0) {
destinyXfate 2:0e2ef1edf01b 168 state->wrap = 0;
destinyXfate 2:0e2ef1edf01b 169 windowBits = -windowBits;
destinyXfate 2:0e2ef1edf01b 170 }
destinyXfate 2:0e2ef1edf01b 171 else {
destinyXfate 2:0e2ef1edf01b 172 state->wrap = (windowBits >> 4) + 1;
destinyXfate 2:0e2ef1edf01b 173 #ifdef GUNZIP
destinyXfate 2:0e2ef1edf01b 174 if (windowBits < 48) windowBits &= 15;
destinyXfate 2:0e2ef1edf01b 175 #endif
destinyXfate 2:0e2ef1edf01b 176 }
destinyXfate 2:0e2ef1edf01b 177 if (windowBits < 8 || windowBits > 15) {
destinyXfate 2:0e2ef1edf01b 178 ZFREE(strm, state);
destinyXfate 2:0e2ef1edf01b 179 strm->state = Z_NULL;
destinyXfate 2:0e2ef1edf01b 180 return Z_STREAM_ERROR;
destinyXfate 2:0e2ef1edf01b 181 }
destinyXfate 2:0e2ef1edf01b 182 state->wbits = (unsigned)windowBits;
destinyXfate 2:0e2ef1edf01b 183 state->window = Z_NULL;
destinyXfate 2:0e2ef1edf01b 184 return inflateReset(strm);
destinyXfate 2:0e2ef1edf01b 185 }
destinyXfate 2:0e2ef1edf01b 186
destinyXfate 2:0e2ef1edf01b 187 int ZEXPORT inflateInit_(strm, version, stream_size)
destinyXfate 2:0e2ef1edf01b 188 z_streamp strm;
destinyXfate 2:0e2ef1edf01b 189 const char *version;
destinyXfate 2:0e2ef1edf01b 190 int stream_size;
destinyXfate 2:0e2ef1edf01b 191 {
destinyXfate 2:0e2ef1edf01b 192 return inflateInit2_(strm, DEF_WBITS, version, stream_size);
destinyXfate 2:0e2ef1edf01b 193 }
destinyXfate 2:0e2ef1edf01b 194
destinyXfate 2:0e2ef1edf01b 195 /*
destinyXfate 2:0e2ef1edf01b 196 Return state with length and distance decoding tables and index sizes set to
destinyXfate 2:0e2ef1edf01b 197 fixed code decoding. Normally this returns fixed tables from inffixed.h.
destinyXfate 2:0e2ef1edf01b 198 If BUILDFIXED is defined, then instead this routine builds the tables the
destinyXfate 2:0e2ef1edf01b 199 first time it's called, and returns those tables the first time and
destinyXfate 2:0e2ef1edf01b 200 thereafter. This reduces the size of the code by about 2K bytes, in
destinyXfate 2:0e2ef1edf01b 201 exchange for a little execution time. However, BUILDFIXED should not be
destinyXfate 2:0e2ef1edf01b 202 used for threaded applications, since the rewriting of the tables and virgin
destinyXfate 2:0e2ef1edf01b 203 may not be thread-safe.
destinyXfate 2:0e2ef1edf01b 204 */
destinyXfate 2:0e2ef1edf01b 205 local void fixedtables(state)
destinyXfate 2:0e2ef1edf01b 206 struct inflate_state FAR *state;
destinyXfate 2:0e2ef1edf01b 207 {
destinyXfate 2:0e2ef1edf01b 208 #ifdef BUILDFIXED
destinyXfate 2:0e2ef1edf01b 209 static int virgin = 1;
destinyXfate 2:0e2ef1edf01b 210 static code *lenfix, *distfix;
destinyXfate 2:0e2ef1edf01b 211 static code fixed[544];
destinyXfate 2:0e2ef1edf01b 212
destinyXfate 2:0e2ef1edf01b 213 /* build fixed huffman tables if first call (may not be thread safe) */
destinyXfate 2:0e2ef1edf01b 214 if (virgin) {
destinyXfate 2:0e2ef1edf01b 215 unsigned sym, bits;
destinyXfate 2:0e2ef1edf01b 216 static code *next;
destinyXfate 2:0e2ef1edf01b 217
destinyXfate 2:0e2ef1edf01b 218 /* literal/length table */
destinyXfate 2:0e2ef1edf01b 219 sym = 0;
destinyXfate 2:0e2ef1edf01b 220 while (sym < 144) state->lens[sym++] = 8;
destinyXfate 2:0e2ef1edf01b 221 while (sym < 256) state->lens[sym++] = 9;
destinyXfate 2:0e2ef1edf01b 222 while (sym < 280) state->lens[sym++] = 7;
destinyXfate 2:0e2ef1edf01b 223 while (sym < 288) state->lens[sym++] = 8;
destinyXfate 2:0e2ef1edf01b 224 next = fixed;
destinyXfate 2:0e2ef1edf01b 225 lenfix = next;
destinyXfate 2:0e2ef1edf01b 226 bits = 9;
destinyXfate 2:0e2ef1edf01b 227 inflate_table(LENS, state->lens, 288, &(next), &(bits), state->work);
destinyXfate 2:0e2ef1edf01b 228
destinyXfate 2:0e2ef1edf01b 229 /* distance table */
destinyXfate 2:0e2ef1edf01b 230 sym = 0;
destinyXfate 2:0e2ef1edf01b 231 while (sym < 32) state->lens[sym++] = 5;
destinyXfate 2:0e2ef1edf01b 232 distfix = next;
destinyXfate 2:0e2ef1edf01b 233 bits = 5;
destinyXfate 2:0e2ef1edf01b 234 inflate_table(DISTS, state->lens, 32, &(next), &(bits), state->work);
destinyXfate 2:0e2ef1edf01b 235
destinyXfate 2:0e2ef1edf01b 236 /* do this just once */
destinyXfate 2:0e2ef1edf01b 237 virgin = 0;
destinyXfate 2:0e2ef1edf01b 238 }
destinyXfate 2:0e2ef1edf01b 239 #else /* !BUILDFIXED */
destinyXfate 2:0e2ef1edf01b 240 # include "inffixed.h"
destinyXfate 2:0e2ef1edf01b 241 #endif /* BUILDFIXED */
destinyXfate 2:0e2ef1edf01b 242 state->lencode = lenfix;
destinyXfate 2:0e2ef1edf01b 243 state->lenbits = 9;
destinyXfate 2:0e2ef1edf01b 244 state->distcode = distfix;
destinyXfate 2:0e2ef1edf01b 245 state->distbits = 5;
destinyXfate 2:0e2ef1edf01b 246 }
destinyXfate 2:0e2ef1edf01b 247
destinyXfate 2:0e2ef1edf01b 248 #ifdef MAKEFIXED
destinyXfate 2:0e2ef1edf01b 249 #include <stdio.h>
destinyXfate 2:0e2ef1edf01b 250
destinyXfate 2:0e2ef1edf01b 251 /*
destinyXfate 2:0e2ef1edf01b 252 Write out the inffixed.h that is #include'd above. Defining MAKEFIXED also
destinyXfate 2:0e2ef1edf01b 253 defines BUILDFIXED, so the tables are built on the fly. makefixed() writes
destinyXfate 2:0e2ef1edf01b 254 those tables to stdout, which would be piped to inffixed.h. A small program
destinyXfate 2:0e2ef1edf01b 255 can simply call makefixed to do this:
destinyXfate 2:0e2ef1edf01b 256
destinyXfate 2:0e2ef1edf01b 257 void makefixed(void);
destinyXfate 2:0e2ef1edf01b 258
destinyXfate 2:0e2ef1edf01b 259 int main(void)
destinyXfate 2:0e2ef1edf01b 260 {
destinyXfate 2:0e2ef1edf01b 261 makefixed();
destinyXfate 2:0e2ef1edf01b 262 return 0;
destinyXfate 2:0e2ef1edf01b 263 }
destinyXfate 2:0e2ef1edf01b 264
destinyXfate 2:0e2ef1edf01b 265 Then that can be linked with zlib built with MAKEFIXED defined and run:
destinyXfate 2:0e2ef1edf01b 266
destinyXfate 2:0e2ef1edf01b 267 a.out > inffixed.h
destinyXfate 2:0e2ef1edf01b 268 */
destinyXfate 2:0e2ef1edf01b 269 void makefixed()
destinyXfate 2:0e2ef1edf01b 270 {
destinyXfate 2:0e2ef1edf01b 271 unsigned low, size;
destinyXfate 2:0e2ef1edf01b 272 struct inflate_state state;
destinyXfate 2:0e2ef1edf01b 273
destinyXfate 2:0e2ef1edf01b 274 fixedtables(&state);
destinyXfate 2:0e2ef1edf01b 275 puts(" /* inffixed.h -- table for decoding fixed codes");
destinyXfate 2:0e2ef1edf01b 276 puts(" * Generated automatically by makefixed().");
destinyXfate 2:0e2ef1edf01b 277 puts(" */");
destinyXfate 2:0e2ef1edf01b 278 puts("");
destinyXfate 2:0e2ef1edf01b 279 puts(" /* WARNING: this file should *not* be used by applications.");
destinyXfate 2:0e2ef1edf01b 280 puts(" It is part of the implementation of this library and is");
destinyXfate 2:0e2ef1edf01b 281 puts(" subject to change. Applications should only use zlib.h.");
destinyXfate 2:0e2ef1edf01b 282 puts(" */");
destinyXfate 2:0e2ef1edf01b 283 puts("");
destinyXfate 2:0e2ef1edf01b 284 size = 1U << 9;
destinyXfate 2:0e2ef1edf01b 285 printf(" static const code lenfix[%u] = {", size);
destinyXfate 2:0e2ef1edf01b 286 low = 0;
destinyXfate 2:0e2ef1edf01b 287 for (;;) {
destinyXfate 2:0e2ef1edf01b 288 if ((low % 7) == 0) printf("\n ");
destinyXfate 2:0e2ef1edf01b 289 printf("{%u,%u,%d}", state.lencode[low].op, state.lencode[low].bits,
destinyXfate 2:0e2ef1edf01b 290 state.lencode[low].val);
destinyXfate 2:0e2ef1edf01b 291 if (++low == size) break;
destinyXfate 2:0e2ef1edf01b 292 putchar(',');
destinyXfate 2:0e2ef1edf01b 293 }
destinyXfate 2:0e2ef1edf01b 294 puts("\n };");
destinyXfate 2:0e2ef1edf01b 295 size = 1U << 5;
destinyXfate 2:0e2ef1edf01b 296 printf("\n static const code distfix[%u] = {", size);
destinyXfate 2:0e2ef1edf01b 297 low = 0;
destinyXfate 2:0e2ef1edf01b 298 for (;;) {
destinyXfate 2:0e2ef1edf01b 299 if ((low % 6) == 0) printf("\n ");
destinyXfate 2:0e2ef1edf01b 300 printf("{%u,%u,%d}", state.distcode[low].op, state.distcode[low].bits,
destinyXfate 2:0e2ef1edf01b 301 state.distcode[low].val);
destinyXfate 2:0e2ef1edf01b 302 if (++low == size) break;
destinyXfate 2:0e2ef1edf01b 303 putchar(',');
destinyXfate 2:0e2ef1edf01b 304 }
destinyXfate 2:0e2ef1edf01b 305 puts("\n };");
destinyXfate 2:0e2ef1edf01b 306 }
destinyXfate 2:0e2ef1edf01b 307 #endif /* MAKEFIXED */
destinyXfate 2:0e2ef1edf01b 308
destinyXfate 2:0e2ef1edf01b 309 /*
destinyXfate 2:0e2ef1edf01b 310 Update the window with the last wsize (normally 32K) bytes written before
destinyXfate 2:0e2ef1edf01b 311 returning. If window does not exist yet, create it. This is only called
destinyXfate 2:0e2ef1edf01b 312 when a window is already in use, or when output has been written during this
destinyXfate 2:0e2ef1edf01b 313 inflate call, but the end of the deflate stream has not been reached yet.
destinyXfate 2:0e2ef1edf01b 314 It is also called to create a window for dictionary data when a dictionary
destinyXfate 2:0e2ef1edf01b 315 is loaded.
destinyXfate 2:0e2ef1edf01b 316
destinyXfate 2:0e2ef1edf01b 317 Providing output buffers larger than 32K to inflate() should provide a speed
destinyXfate 2:0e2ef1edf01b 318 advantage, since only the last 32K of output is copied to the sliding window
destinyXfate 2:0e2ef1edf01b 319 upon return from inflate(), and since all distances after the first 32K of
destinyXfate 2:0e2ef1edf01b 320 output will fall in the output data, making match copies simpler and faster.
destinyXfate 2:0e2ef1edf01b 321 The advantage may be dependent on the size of the processor's data caches.
destinyXfate 2:0e2ef1edf01b 322 */
destinyXfate 2:0e2ef1edf01b 323 local int updatewindow(strm, out)
destinyXfate 2:0e2ef1edf01b 324 z_streamp strm;
destinyXfate 2:0e2ef1edf01b 325 unsigned out;
destinyXfate 2:0e2ef1edf01b 326 {
destinyXfate 2:0e2ef1edf01b 327 struct inflate_state FAR *state;
destinyXfate 2:0e2ef1edf01b 328 unsigned copy, dist;
destinyXfate 2:0e2ef1edf01b 329
destinyXfate 2:0e2ef1edf01b 330 state = (struct inflate_state FAR *)strm->state;
destinyXfate 2:0e2ef1edf01b 331
destinyXfate 2:0e2ef1edf01b 332 /* if it hasn't been done already, allocate space for the window */
destinyXfate 2:0e2ef1edf01b 333 if (state->window == Z_NULL) {
destinyXfate 2:0e2ef1edf01b 334 state->window = (unsigned char FAR *)
destinyXfate 2:0e2ef1edf01b 335 ZALLOC(strm, 1U << state->wbits,
destinyXfate 2:0e2ef1edf01b 336 sizeof(unsigned char));
destinyXfate 2:0e2ef1edf01b 337 if (state->window == Z_NULL) return 1;
destinyXfate 2:0e2ef1edf01b 338 }
destinyXfate 2:0e2ef1edf01b 339
destinyXfate 2:0e2ef1edf01b 340 /* if window not in use yet, initialize */
destinyXfate 2:0e2ef1edf01b 341 if (state->wsize == 0) {
destinyXfate 2:0e2ef1edf01b 342 state->wsize = 1U << state->wbits;
destinyXfate 2:0e2ef1edf01b 343 state->write = 0;
destinyXfate 2:0e2ef1edf01b 344 state->whave = 0;
destinyXfate 2:0e2ef1edf01b 345 }
destinyXfate 2:0e2ef1edf01b 346
destinyXfate 2:0e2ef1edf01b 347 /* copy state->wsize or less output bytes into the circular window */
destinyXfate 2:0e2ef1edf01b 348 copy = out - strm->avail_out;
destinyXfate 2:0e2ef1edf01b 349 if (copy >= state->wsize) {
destinyXfate 2:0e2ef1edf01b 350 zmemcpy(state->window, strm->next_out - state->wsize, state->wsize);
destinyXfate 2:0e2ef1edf01b 351 state->write = 0;
destinyXfate 2:0e2ef1edf01b 352 state->whave = state->wsize;
destinyXfate 2:0e2ef1edf01b 353 }
destinyXfate 2:0e2ef1edf01b 354 else {
destinyXfate 2:0e2ef1edf01b 355 dist = state->wsize - state->write;
destinyXfate 2:0e2ef1edf01b 356 if (dist > copy) dist = copy;
destinyXfate 2:0e2ef1edf01b 357 zmemcpy(state->window + state->write, strm->next_out - copy, dist);
destinyXfate 2:0e2ef1edf01b 358 copy -= dist;
destinyXfate 2:0e2ef1edf01b 359 if (copy) {
destinyXfate 2:0e2ef1edf01b 360 zmemcpy(state->window, strm->next_out - copy, copy);
destinyXfate 2:0e2ef1edf01b 361 state->write = copy;
destinyXfate 2:0e2ef1edf01b 362 state->whave = state->wsize;
destinyXfate 2:0e2ef1edf01b 363 }
destinyXfate 2:0e2ef1edf01b 364 else {
destinyXfate 2:0e2ef1edf01b 365 state->write += dist;
destinyXfate 2:0e2ef1edf01b 366 if (state->write == state->wsize) state->write = 0;
destinyXfate 2:0e2ef1edf01b 367 if (state->whave < state->wsize) state->whave += dist;
destinyXfate 2:0e2ef1edf01b 368 }
destinyXfate 2:0e2ef1edf01b 369 }
destinyXfate 2:0e2ef1edf01b 370 return 0;
destinyXfate 2:0e2ef1edf01b 371 }
destinyXfate 2:0e2ef1edf01b 372
destinyXfate 2:0e2ef1edf01b 373 /* Macros for inflate(): */
destinyXfate 2:0e2ef1edf01b 374
destinyXfate 2:0e2ef1edf01b 375 /* check function to use adler32() for zlib or crc32() for gzip */
destinyXfate 2:0e2ef1edf01b 376 #ifdef GUNZIP
destinyXfate 2:0e2ef1edf01b 377 # define UPDATE(check, buf, len) \
destinyXfate 2:0e2ef1edf01b 378 (state->flags ? crc32(check, buf, len) : adler32(check, buf, len))
destinyXfate 2:0e2ef1edf01b 379 #else
destinyXfate 2:0e2ef1edf01b 380 # define UPDATE(check, buf, len) adler32(check, buf, len)
destinyXfate 2:0e2ef1edf01b 381 #endif
destinyXfate 2:0e2ef1edf01b 382
destinyXfate 2:0e2ef1edf01b 383 /* check macros for header crc */
destinyXfate 2:0e2ef1edf01b 384 #ifdef GUNZIP
destinyXfate 2:0e2ef1edf01b 385 # define CRC2(check, word) \
destinyXfate 2:0e2ef1edf01b 386 do { \
destinyXfate 2:0e2ef1edf01b 387 hbuf[0] = (unsigned char)(word); \
destinyXfate 2:0e2ef1edf01b 388 hbuf[1] = (unsigned char)((word) >> 8); \
destinyXfate 2:0e2ef1edf01b 389 check = crc32(check, hbuf, 2); \
destinyXfate 2:0e2ef1edf01b 390 } while (0)
destinyXfate 2:0e2ef1edf01b 391
destinyXfate 2:0e2ef1edf01b 392 # define CRC4(check, word) \
destinyXfate 2:0e2ef1edf01b 393 do { \
destinyXfate 2:0e2ef1edf01b 394 hbuf[0] = (unsigned char)(word); \
destinyXfate 2:0e2ef1edf01b 395 hbuf[1] = (unsigned char)((word) >> 8); \
destinyXfate 2:0e2ef1edf01b 396 hbuf[2] = (unsigned char)((word) >> 16); \
destinyXfate 2:0e2ef1edf01b 397 hbuf[3] = (unsigned char)((word) >> 24); \
destinyXfate 2:0e2ef1edf01b 398 check = crc32(check, hbuf, 4); \
destinyXfate 2:0e2ef1edf01b 399 } while (0)
destinyXfate 2:0e2ef1edf01b 400 #endif
destinyXfate 2:0e2ef1edf01b 401
destinyXfate 2:0e2ef1edf01b 402 /* Load registers with state in inflate() for speed */
destinyXfate 2:0e2ef1edf01b 403 #define LOAD() \
destinyXfate 2:0e2ef1edf01b 404 do { \
destinyXfate 2:0e2ef1edf01b 405 put = strm->next_out; \
destinyXfate 2:0e2ef1edf01b 406 left = strm->avail_out; \
destinyXfate 2:0e2ef1edf01b 407 next = strm->next_in; \
destinyXfate 2:0e2ef1edf01b 408 have = strm->avail_in; \
destinyXfate 2:0e2ef1edf01b 409 hold = state->hold; \
destinyXfate 2:0e2ef1edf01b 410 bits = state->bits; \
destinyXfate 2:0e2ef1edf01b 411 } while (0)
destinyXfate 2:0e2ef1edf01b 412
destinyXfate 2:0e2ef1edf01b 413 /* Restore state from registers in inflate() */
destinyXfate 2:0e2ef1edf01b 414 #define RESTORE() \
destinyXfate 2:0e2ef1edf01b 415 do { \
destinyXfate 2:0e2ef1edf01b 416 strm->next_out = put; \
destinyXfate 2:0e2ef1edf01b 417 strm->avail_out = left; \
destinyXfate 2:0e2ef1edf01b 418 strm->next_in = next; \
destinyXfate 2:0e2ef1edf01b 419 strm->avail_in = have; \
destinyXfate 2:0e2ef1edf01b 420 state->hold = hold; \
destinyXfate 2:0e2ef1edf01b 421 state->bits = bits; \
destinyXfate 2:0e2ef1edf01b 422 } while (0)
destinyXfate 2:0e2ef1edf01b 423
destinyXfate 2:0e2ef1edf01b 424 /* Clear the input bit accumulator */
destinyXfate 2:0e2ef1edf01b 425 #define INITBITS() \
destinyXfate 2:0e2ef1edf01b 426 do { \
destinyXfate 2:0e2ef1edf01b 427 hold = 0; \
destinyXfate 2:0e2ef1edf01b 428 bits = 0; \
destinyXfate 2:0e2ef1edf01b 429 } while (0)
destinyXfate 2:0e2ef1edf01b 430
destinyXfate 2:0e2ef1edf01b 431 /* Get a byte of input into the bit accumulator, or return from inflate()
destinyXfate 2:0e2ef1edf01b 432 if there is no input available. */
destinyXfate 2:0e2ef1edf01b 433 #define PULLBYTE() \
destinyXfate 2:0e2ef1edf01b 434 do { \
destinyXfate 2:0e2ef1edf01b 435 if (have == 0) goto inf_leave; \
destinyXfate 2:0e2ef1edf01b 436 have--; \
destinyXfate 2:0e2ef1edf01b 437 hold += (unsigned long)(*next++) << bits; \
destinyXfate 2:0e2ef1edf01b 438 bits += 8; \
destinyXfate 2:0e2ef1edf01b 439 } while (0)
destinyXfate 2:0e2ef1edf01b 440
destinyXfate 2:0e2ef1edf01b 441 /* Assure that there are at least n bits in the bit accumulator. If there is
destinyXfate 2:0e2ef1edf01b 442 not enough available input to do that, then return from inflate(). */
destinyXfate 2:0e2ef1edf01b 443 #define NEEDBITS(n) \
destinyXfate 2:0e2ef1edf01b 444 do { \
destinyXfate 2:0e2ef1edf01b 445 while (bits < (unsigned)(n)) \
destinyXfate 2:0e2ef1edf01b 446 PULLBYTE(); \
destinyXfate 2:0e2ef1edf01b 447 } while (0)
destinyXfate 2:0e2ef1edf01b 448
destinyXfate 2:0e2ef1edf01b 449 /* Return the low n bits of the bit accumulator (n < 16) */
destinyXfate 2:0e2ef1edf01b 450 #define BITS(n) \
destinyXfate 2:0e2ef1edf01b 451 ((unsigned)hold & ((1U << (n)) - 1))
destinyXfate 2:0e2ef1edf01b 452
destinyXfate 2:0e2ef1edf01b 453 /* Remove n bits from the bit accumulator */
destinyXfate 2:0e2ef1edf01b 454 #define DROPBITS(n) \
destinyXfate 2:0e2ef1edf01b 455 do { \
destinyXfate 2:0e2ef1edf01b 456 hold >>= (n); \
destinyXfate 2:0e2ef1edf01b 457 bits -= (unsigned)(n); \
destinyXfate 2:0e2ef1edf01b 458 } while (0)
destinyXfate 2:0e2ef1edf01b 459
destinyXfate 2:0e2ef1edf01b 460 /* Remove zero to seven bits as needed to go to a byte boundary */
destinyXfate 2:0e2ef1edf01b 461 #define BYTEBITS() \
destinyXfate 2:0e2ef1edf01b 462 do { \
destinyXfate 2:0e2ef1edf01b 463 hold >>= bits & 7; \
destinyXfate 2:0e2ef1edf01b 464 bits -= bits & 7; \
destinyXfate 2:0e2ef1edf01b 465 } while (0)
destinyXfate 2:0e2ef1edf01b 466
destinyXfate 2:0e2ef1edf01b 467 /* Reverse the bytes in a 32-bit value */
destinyXfate 2:0e2ef1edf01b 468 #define REVERSE(q) \
destinyXfate 2:0e2ef1edf01b 469 ((((q) >> 24) & 0xff) + (((q) >> 8) & 0xff00) + \
destinyXfate 2:0e2ef1edf01b 470 (((q) & 0xff00) << 8) + (((q) & 0xff) << 24))
destinyXfate 2:0e2ef1edf01b 471
destinyXfate 2:0e2ef1edf01b 472 /*
destinyXfate 2:0e2ef1edf01b 473 inflate() uses a state machine to process as much input data and generate as
destinyXfate 2:0e2ef1edf01b 474 much output data as possible before returning. The state machine is
destinyXfate 2:0e2ef1edf01b 475 structured roughly as follows:
destinyXfate 2:0e2ef1edf01b 476
destinyXfate 2:0e2ef1edf01b 477 for (;;) switch (state) {
destinyXfate 2:0e2ef1edf01b 478 ...
destinyXfate 2:0e2ef1edf01b 479 case STATEn:
destinyXfate 2:0e2ef1edf01b 480 if (not enough input data or output space to make progress)
destinyXfate 2:0e2ef1edf01b 481 return;
destinyXfate 2:0e2ef1edf01b 482 ... make progress ...
destinyXfate 2:0e2ef1edf01b 483 state = STATEm;
destinyXfate 2:0e2ef1edf01b 484 break;
destinyXfate 2:0e2ef1edf01b 485 ...
destinyXfate 2:0e2ef1edf01b 486 }
destinyXfate 2:0e2ef1edf01b 487
destinyXfate 2:0e2ef1edf01b 488 so when inflate() is called again, the same case is attempted again, and
destinyXfate 2:0e2ef1edf01b 489 if the appropriate resources are provided, the machine proceeds to the
destinyXfate 2:0e2ef1edf01b 490 next state. The NEEDBITS() macro is usually the way the state evaluates
destinyXfate 2:0e2ef1edf01b 491 whether it can proceed or should return. NEEDBITS() does the return if
destinyXfate 2:0e2ef1edf01b 492 the requested bits are not available. The typical use of the BITS macros
destinyXfate 2:0e2ef1edf01b 493 is:
destinyXfate 2:0e2ef1edf01b 494
destinyXfate 2:0e2ef1edf01b 495 NEEDBITS(n);
destinyXfate 2:0e2ef1edf01b 496 ... do something with BITS(n) ...
destinyXfate 2:0e2ef1edf01b 497 DROPBITS(n);
destinyXfate 2:0e2ef1edf01b 498
destinyXfate 2:0e2ef1edf01b 499 where NEEDBITS(n) either returns from inflate() if there isn't enough
destinyXfate 2:0e2ef1edf01b 500 input left to load n bits into the accumulator, or it continues. BITS(n)
destinyXfate 2:0e2ef1edf01b 501 gives the low n bits in the accumulator. When done, DROPBITS(n) drops
destinyXfate 2:0e2ef1edf01b 502 the low n bits off the accumulator. INITBITS() clears the accumulator
destinyXfate 2:0e2ef1edf01b 503 and sets the number of available bits to zero. BYTEBITS() discards just
destinyXfate 2:0e2ef1edf01b 504 enough bits to put the accumulator on a byte boundary. After BYTEBITS()
destinyXfate 2:0e2ef1edf01b 505 and a NEEDBITS(8), then BITS(8) would return the next byte in the stream.
destinyXfate 2:0e2ef1edf01b 506
destinyXfate 2:0e2ef1edf01b 507 NEEDBITS(n) uses PULLBYTE() to get an available byte of input, or to return
destinyXfate 2:0e2ef1edf01b 508 if there is no input available. The decoding of variable length codes uses
destinyXfate 2:0e2ef1edf01b 509 PULLBYTE() directly in order to pull just enough bytes to decode the next
destinyXfate 2:0e2ef1edf01b 510 code, and no more.
destinyXfate 2:0e2ef1edf01b 511
destinyXfate 2:0e2ef1edf01b 512 Some states loop until they get enough input, making sure that enough
destinyXfate 2:0e2ef1edf01b 513 state information is maintained to continue the loop where it left off
destinyXfate 2:0e2ef1edf01b 514 if NEEDBITS() returns in the loop. For example, want, need, and keep
destinyXfate 2:0e2ef1edf01b 515 would all have to actually be part of the saved state in case NEEDBITS()
destinyXfate 2:0e2ef1edf01b 516 returns:
destinyXfate 2:0e2ef1edf01b 517
destinyXfate 2:0e2ef1edf01b 518 case STATEw:
destinyXfate 2:0e2ef1edf01b 519 while (want < need) {
destinyXfate 2:0e2ef1edf01b 520 NEEDBITS(n);
destinyXfate 2:0e2ef1edf01b 521 keep[want++] = BITS(n);
destinyXfate 2:0e2ef1edf01b 522 DROPBITS(n);
destinyXfate 2:0e2ef1edf01b 523 }
destinyXfate 2:0e2ef1edf01b 524 state = STATEx;
destinyXfate 2:0e2ef1edf01b 525 case STATEx:
destinyXfate 2:0e2ef1edf01b 526
destinyXfate 2:0e2ef1edf01b 527 As shown above, if the next state is also the next case, then the break
destinyXfate 2:0e2ef1edf01b 528 is omitted.
destinyXfate 2:0e2ef1edf01b 529
destinyXfate 2:0e2ef1edf01b 530 A state may also return if there is not enough output space available to
destinyXfate 2:0e2ef1edf01b 531 complete that state. Those states are copying stored data, writing a
destinyXfate 2:0e2ef1edf01b 532 literal byte, and copying a matching string.
destinyXfate 2:0e2ef1edf01b 533
destinyXfate 2:0e2ef1edf01b 534 When returning, a "goto inf_leave" is used to update the total counters,
destinyXfate 2:0e2ef1edf01b 535 update the check value, and determine whether any progress has been made
destinyXfate 2:0e2ef1edf01b 536 during that inflate() call in order to return the proper return code.
destinyXfate 2:0e2ef1edf01b 537 Progress is defined as a change in either strm->avail_in or strm->avail_out.
destinyXfate 2:0e2ef1edf01b 538 When there is a window, goto inf_leave will update the window with the last
destinyXfate 2:0e2ef1edf01b 539 output written. If a goto inf_leave occurs in the middle of decompression
destinyXfate 2:0e2ef1edf01b 540 and there is no window currently, goto inf_leave will create one and copy
destinyXfate 2:0e2ef1edf01b 541 output to the window for the next call of inflate().
destinyXfate 2:0e2ef1edf01b 542
destinyXfate 2:0e2ef1edf01b 543 In this implementation, the flush parameter of inflate() only affects the
destinyXfate 2:0e2ef1edf01b 544 return code (per zlib.h). inflate() always writes as much as possible to
destinyXfate 2:0e2ef1edf01b 545 strm->next_out, given the space available and the provided input--the effect
destinyXfate 2:0e2ef1edf01b 546 documented in zlib.h of Z_SYNC_FLUSH. Furthermore, inflate() always defers
destinyXfate 2:0e2ef1edf01b 547 the allocation of and copying into a sliding window until necessary, which
destinyXfate 2:0e2ef1edf01b 548 provides the effect documented in zlib.h for Z_FINISH when the entire input
destinyXfate 2:0e2ef1edf01b 549 stream available. So the only thing the flush parameter actually does is:
destinyXfate 2:0e2ef1edf01b 550 when flush is set to Z_FINISH, inflate() cannot return Z_OK. Instead it
destinyXfate 2:0e2ef1edf01b 551 will return Z_BUF_ERROR if it has not reached the end of the stream.
destinyXfate 2:0e2ef1edf01b 552 */
destinyXfate 2:0e2ef1edf01b 553
destinyXfate 2:0e2ef1edf01b 554 int ZEXPORT inflate(strm, flush)
destinyXfate 2:0e2ef1edf01b 555 z_streamp strm;
destinyXfate 2:0e2ef1edf01b 556 int flush;
destinyXfate 2:0e2ef1edf01b 557 {
destinyXfate 2:0e2ef1edf01b 558 struct inflate_state FAR *state;
destinyXfate 2:0e2ef1edf01b 559 unsigned char FAR *next; /* next input */
destinyXfate 2:0e2ef1edf01b 560 unsigned char FAR *put; /* next output */
destinyXfate 2:0e2ef1edf01b 561 unsigned have, left; /* available input and output */
destinyXfate 2:0e2ef1edf01b 562 unsigned long hold; /* bit buffer */
destinyXfate 2:0e2ef1edf01b 563 unsigned bits; /* bits in bit buffer */
destinyXfate 2:0e2ef1edf01b 564 unsigned in, out; /* save starting available input and output */
destinyXfate 2:0e2ef1edf01b 565 unsigned copy; /* number of stored or match bytes to copy */
destinyXfate 2:0e2ef1edf01b 566 unsigned char FAR *from; /* where to copy match bytes from */
destinyXfate 2:0e2ef1edf01b 567 code this; /* current decoding table entry */
destinyXfate 2:0e2ef1edf01b 568 code last; /* parent table entry */
destinyXfate 2:0e2ef1edf01b 569 unsigned len; /* length to copy for repeats, bits to drop */
destinyXfate 2:0e2ef1edf01b 570 int ret; /* return code */
destinyXfate 2:0e2ef1edf01b 571 #ifdef GUNZIP
destinyXfate 2:0e2ef1edf01b 572 unsigned char hbuf[4]; /* buffer for gzip header crc calculation */
destinyXfate 2:0e2ef1edf01b 573 #endif
destinyXfate 2:0e2ef1edf01b 574 static const unsigned short order[19] = /* permutation of code lengths */
destinyXfate 2:0e2ef1edf01b 575 {16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15};
destinyXfate 2:0e2ef1edf01b 576
destinyXfate 2:0e2ef1edf01b 577 if (strm == Z_NULL || strm->state == Z_NULL || strm->next_out == Z_NULL ||
destinyXfate 2:0e2ef1edf01b 578 (strm->next_in == Z_NULL && strm->avail_in != 0))
destinyXfate 2:0e2ef1edf01b 579 return Z_STREAM_ERROR;
destinyXfate 2:0e2ef1edf01b 580
destinyXfate 2:0e2ef1edf01b 581 state = (struct inflate_state FAR *)strm->state;
destinyXfate 2:0e2ef1edf01b 582 if (state->mode == TYPE) state->mode = TYPEDO; /* skip check */
destinyXfate 2:0e2ef1edf01b 583 LOAD();
destinyXfate 2:0e2ef1edf01b 584 in = have;
destinyXfate 2:0e2ef1edf01b 585 out = left;
destinyXfate 2:0e2ef1edf01b 586 ret = Z_OK;
destinyXfate 2:0e2ef1edf01b 587 for (;;)
destinyXfate 2:0e2ef1edf01b 588 switch (state->mode) {
destinyXfate 2:0e2ef1edf01b 589 case HEAD:
destinyXfate 2:0e2ef1edf01b 590 if (state->wrap == 0) {
destinyXfate 2:0e2ef1edf01b 591 state->mode = TYPEDO;
destinyXfate 2:0e2ef1edf01b 592 break;
destinyXfate 2:0e2ef1edf01b 593 }
destinyXfate 2:0e2ef1edf01b 594 NEEDBITS(16);
destinyXfate 2:0e2ef1edf01b 595 #ifdef GUNZIP
destinyXfate 2:0e2ef1edf01b 596 if ((state->wrap & 2) && hold == 0x8b1f) { /* gzip header */
destinyXfate 2:0e2ef1edf01b 597 state->check = crc32(0L, Z_NULL, 0);
destinyXfate 2:0e2ef1edf01b 598 CRC2(state->check, hold);
destinyXfate 2:0e2ef1edf01b 599 INITBITS();
destinyXfate 2:0e2ef1edf01b 600 state->mode = FLAGS;
destinyXfate 2:0e2ef1edf01b 601 break;
destinyXfate 2:0e2ef1edf01b 602 }
destinyXfate 2:0e2ef1edf01b 603 state->flags = 0; /* expect zlib header */
destinyXfate 2:0e2ef1edf01b 604 if (state->head != Z_NULL)
destinyXfate 2:0e2ef1edf01b 605 state->head->done = -1;
destinyXfate 2:0e2ef1edf01b 606 if (!(state->wrap & 1) || /* check if zlib header allowed */
destinyXfate 2:0e2ef1edf01b 607 #else
destinyXfate 2:0e2ef1edf01b 608 if (
destinyXfate 2:0e2ef1edf01b 609 #endif
destinyXfate 2:0e2ef1edf01b 610 ((BITS(8) << 8) + (hold >> 8)) % 31) {
destinyXfate 2:0e2ef1edf01b 611 strm->msg = (char *)"incorrect header check";
destinyXfate 2:0e2ef1edf01b 612 state->mode = BAD;
destinyXfate 2:0e2ef1edf01b 613 break;
destinyXfate 2:0e2ef1edf01b 614 }
destinyXfate 2:0e2ef1edf01b 615 if (BITS(4) != Z_DEFLATED) {
destinyXfate 2:0e2ef1edf01b 616 strm->msg = (char *)"unknown compression method";
destinyXfate 2:0e2ef1edf01b 617 state->mode = BAD;
destinyXfate 2:0e2ef1edf01b 618 break;
destinyXfate 2:0e2ef1edf01b 619 }
destinyXfate 2:0e2ef1edf01b 620 DROPBITS(4);
destinyXfate 2:0e2ef1edf01b 621 len = BITS(4) + 8;
destinyXfate 2:0e2ef1edf01b 622 if (len > state->wbits) {
destinyXfate 2:0e2ef1edf01b 623 strm->msg = (char *)"invalid window size";
destinyXfate 2:0e2ef1edf01b 624 state->mode = BAD;
destinyXfate 2:0e2ef1edf01b 625 break;
destinyXfate 2:0e2ef1edf01b 626 }
destinyXfate 2:0e2ef1edf01b 627 state->dmax = 1U << len;
destinyXfate 2:0e2ef1edf01b 628 Tracev((stderr, "inflate: zlib header ok\n"));
destinyXfate 2:0e2ef1edf01b 629 strm->adler = state->check = adler32(0L, Z_NULL, 0);
destinyXfate 2:0e2ef1edf01b 630 state->mode = hold & 0x200 ? DICTID : TYPE;
destinyXfate 2:0e2ef1edf01b 631 INITBITS();
destinyXfate 2:0e2ef1edf01b 632 break;
destinyXfate 2:0e2ef1edf01b 633 #ifdef GUNZIP
destinyXfate 2:0e2ef1edf01b 634 case FLAGS:
destinyXfate 2:0e2ef1edf01b 635 NEEDBITS(16);
destinyXfate 2:0e2ef1edf01b 636 state->flags = (int)(hold);
destinyXfate 2:0e2ef1edf01b 637 if ((state->flags & 0xff) != Z_DEFLATED) {
destinyXfate 2:0e2ef1edf01b 638 strm->msg = (char *)"unknown compression method";
destinyXfate 2:0e2ef1edf01b 639 state->mode = BAD;
destinyXfate 2:0e2ef1edf01b 640 break;
destinyXfate 2:0e2ef1edf01b 641 }
destinyXfate 2:0e2ef1edf01b 642 if (state->flags & 0xe000) {
destinyXfate 2:0e2ef1edf01b 643 strm->msg = (char *)"unknown header flags set";
destinyXfate 2:0e2ef1edf01b 644 state->mode = BAD;
destinyXfate 2:0e2ef1edf01b 645 break;
destinyXfate 2:0e2ef1edf01b 646 }
destinyXfate 2:0e2ef1edf01b 647 if (state->head != Z_NULL)
destinyXfate 2:0e2ef1edf01b 648 state->head->text = (int)((hold >> 8) & 1);
destinyXfate 2:0e2ef1edf01b 649 if (state->flags & 0x0200) CRC2(state->check, hold);
destinyXfate 2:0e2ef1edf01b 650 INITBITS();
destinyXfate 2:0e2ef1edf01b 651 state->mode = TIME;
destinyXfate 2:0e2ef1edf01b 652 case TIME:
destinyXfate 2:0e2ef1edf01b 653 NEEDBITS(32);
destinyXfate 2:0e2ef1edf01b 654 if (state->head != Z_NULL)
destinyXfate 2:0e2ef1edf01b 655 state->head->time = hold;
destinyXfate 2:0e2ef1edf01b 656 if (state->flags & 0x0200) CRC4(state->check, hold);
destinyXfate 2:0e2ef1edf01b 657 INITBITS();
destinyXfate 2:0e2ef1edf01b 658 state->mode = OS;
destinyXfate 2:0e2ef1edf01b 659 case OS:
destinyXfate 2:0e2ef1edf01b 660 NEEDBITS(16);
destinyXfate 2:0e2ef1edf01b 661 if (state->head != Z_NULL) {
destinyXfate 2:0e2ef1edf01b 662 state->head->xflags = (int)(hold & 0xff);
destinyXfate 2:0e2ef1edf01b 663 state->head->os = (int)(hold >> 8);
destinyXfate 2:0e2ef1edf01b 664 }
destinyXfate 2:0e2ef1edf01b 665 if (state->flags & 0x0200) CRC2(state->check, hold);
destinyXfate 2:0e2ef1edf01b 666 INITBITS();
destinyXfate 2:0e2ef1edf01b 667 state->mode = EXLEN;
destinyXfate 2:0e2ef1edf01b 668 case EXLEN:
destinyXfate 2:0e2ef1edf01b 669 if (state->flags & 0x0400) {
destinyXfate 2:0e2ef1edf01b 670 NEEDBITS(16);
destinyXfate 2:0e2ef1edf01b 671 state->length = (unsigned)(hold);
destinyXfate 2:0e2ef1edf01b 672 if (state->head != Z_NULL)
destinyXfate 2:0e2ef1edf01b 673 state->head->extra_len = (unsigned)hold;
destinyXfate 2:0e2ef1edf01b 674 if (state->flags & 0x0200) CRC2(state->check, hold);
destinyXfate 2:0e2ef1edf01b 675 INITBITS();
destinyXfate 2:0e2ef1edf01b 676 }
destinyXfate 2:0e2ef1edf01b 677 else if (state->head != Z_NULL)
destinyXfate 2:0e2ef1edf01b 678 state->head->extra = Z_NULL;
destinyXfate 2:0e2ef1edf01b 679 state->mode = EXTRA;
destinyXfate 2:0e2ef1edf01b 680 case EXTRA:
destinyXfate 2:0e2ef1edf01b 681 if (state->flags & 0x0400) {
destinyXfate 2:0e2ef1edf01b 682 copy = state->length;
destinyXfate 2:0e2ef1edf01b 683 if (copy > have) copy = have;
destinyXfate 2:0e2ef1edf01b 684 if (copy) {
destinyXfate 2:0e2ef1edf01b 685 if (state->head != Z_NULL &&
destinyXfate 2:0e2ef1edf01b 686 state->head->extra != Z_NULL) {
destinyXfate 2:0e2ef1edf01b 687 len = state->head->extra_len - state->length;
destinyXfate 2:0e2ef1edf01b 688 zmemcpy(state->head->extra + len, next,
destinyXfate 2:0e2ef1edf01b 689 len + copy > state->head->extra_max ?
destinyXfate 2:0e2ef1edf01b 690 state->head->extra_max - len : copy);
destinyXfate 2:0e2ef1edf01b 691 }
destinyXfate 2:0e2ef1edf01b 692 if (state->flags & 0x0200)
destinyXfate 2:0e2ef1edf01b 693 state->check = crc32(state->check, next, copy);
destinyXfate 2:0e2ef1edf01b 694 have -= copy;
destinyXfate 2:0e2ef1edf01b 695 next += copy;
destinyXfate 2:0e2ef1edf01b 696 state->length -= copy;
destinyXfate 2:0e2ef1edf01b 697 }
destinyXfate 2:0e2ef1edf01b 698 if (state->length) goto inf_leave;
destinyXfate 2:0e2ef1edf01b 699 }
destinyXfate 2:0e2ef1edf01b 700 state->length = 0;
destinyXfate 2:0e2ef1edf01b 701 state->mode = NAME;
destinyXfate 2:0e2ef1edf01b 702 case NAME:
destinyXfate 2:0e2ef1edf01b 703 if (state->flags & 0x0800) {
destinyXfate 2:0e2ef1edf01b 704 if (have == 0) goto inf_leave;
destinyXfate 2:0e2ef1edf01b 705 copy = 0;
destinyXfate 2:0e2ef1edf01b 706 do {
destinyXfate 2:0e2ef1edf01b 707 len = (unsigned)(next[copy++]);
destinyXfate 2:0e2ef1edf01b 708 if (state->head != Z_NULL &&
destinyXfate 2:0e2ef1edf01b 709 state->head->name != Z_NULL &&
destinyXfate 2:0e2ef1edf01b 710 state->length < state->head->name_max)
destinyXfate 2:0e2ef1edf01b 711 state->head->name[state->length++] = len;
destinyXfate 2:0e2ef1edf01b 712 } while (len && copy < have);
destinyXfate 2:0e2ef1edf01b 713 if (state->flags & 0x0200)
destinyXfate 2:0e2ef1edf01b 714 state->check = crc32(state->check, next, copy);
destinyXfate 2:0e2ef1edf01b 715 have -= copy;
destinyXfate 2:0e2ef1edf01b 716 next += copy;
destinyXfate 2:0e2ef1edf01b 717 if (len) goto inf_leave;
destinyXfate 2:0e2ef1edf01b 718 }
destinyXfate 2:0e2ef1edf01b 719 else if (state->head != Z_NULL)
destinyXfate 2:0e2ef1edf01b 720 state->head->name = Z_NULL;
destinyXfate 2:0e2ef1edf01b 721 state->length = 0;
destinyXfate 2:0e2ef1edf01b 722 state->mode = COMMENT;
destinyXfate 2:0e2ef1edf01b 723 case COMMENT:
destinyXfate 2:0e2ef1edf01b 724 if (state->flags & 0x1000) {
destinyXfate 2:0e2ef1edf01b 725 if (have == 0) goto inf_leave;
destinyXfate 2:0e2ef1edf01b 726 copy = 0;
destinyXfate 2:0e2ef1edf01b 727 do {
destinyXfate 2:0e2ef1edf01b 728 len = (unsigned)(next[copy++]);
destinyXfate 2:0e2ef1edf01b 729 if (state->head != Z_NULL &&
destinyXfate 2:0e2ef1edf01b 730 state->head->comment != Z_NULL &&
destinyXfate 2:0e2ef1edf01b 731 state->length < state->head->comm_max)
destinyXfate 2:0e2ef1edf01b 732 state->head->comment[state->length++] = len;
destinyXfate 2:0e2ef1edf01b 733 } while (len && copy < have);
destinyXfate 2:0e2ef1edf01b 734 if (state->flags & 0x0200)
destinyXfate 2:0e2ef1edf01b 735 state->check = crc32(state->check, next, copy);
destinyXfate 2:0e2ef1edf01b 736 have -= copy;
destinyXfate 2:0e2ef1edf01b 737 next += copy;
destinyXfate 2:0e2ef1edf01b 738 if (len) goto inf_leave;
destinyXfate 2:0e2ef1edf01b 739 }
destinyXfate 2:0e2ef1edf01b 740 else if (state->head != Z_NULL)
destinyXfate 2:0e2ef1edf01b 741 state->head->comment = Z_NULL;
destinyXfate 2:0e2ef1edf01b 742 state->mode = HCRC;
destinyXfate 2:0e2ef1edf01b 743 case HCRC:
destinyXfate 2:0e2ef1edf01b 744 if (state->flags & 0x0200) {
destinyXfate 2:0e2ef1edf01b 745 NEEDBITS(16);
destinyXfate 2:0e2ef1edf01b 746 if (hold != (state->check & 0xffff)) {
destinyXfate 2:0e2ef1edf01b 747 strm->msg = (char *)"header crc mismatch";
destinyXfate 2:0e2ef1edf01b 748 state->mode = BAD;
destinyXfate 2:0e2ef1edf01b 749 break;
destinyXfate 2:0e2ef1edf01b 750 }
destinyXfate 2:0e2ef1edf01b 751 INITBITS();
destinyXfate 2:0e2ef1edf01b 752 }
destinyXfate 2:0e2ef1edf01b 753 if (state->head != Z_NULL) {
destinyXfate 2:0e2ef1edf01b 754 state->head->hcrc = (int)((state->flags >> 9) & 1);
destinyXfate 2:0e2ef1edf01b 755 state->head->done = 1;
destinyXfate 2:0e2ef1edf01b 756 }
destinyXfate 2:0e2ef1edf01b 757 strm->adler = state->check = crc32(0L, Z_NULL, 0);
destinyXfate 2:0e2ef1edf01b 758 state->mode = TYPE;
destinyXfate 2:0e2ef1edf01b 759 break;
destinyXfate 2:0e2ef1edf01b 760 #endif
destinyXfate 2:0e2ef1edf01b 761 case DICTID:
destinyXfate 2:0e2ef1edf01b 762 NEEDBITS(32);
destinyXfate 2:0e2ef1edf01b 763 strm->adler = state->check = REVERSE(hold);
destinyXfate 2:0e2ef1edf01b 764 INITBITS();
destinyXfate 2:0e2ef1edf01b 765 state->mode = DICT;
destinyXfate 2:0e2ef1edf01b 766 case DICT:
destinyXfate 2:0e2ef1edf01b 767 if (state->havedict == 0) {
destinyXfate 2:0e2ef1edf01b 768 RESTORE();
destinyXfate 2:0e2ef1edf01b 769 return Z_NEED_DICT;
destinyXfate 2:0e2ef1edf01b 770 }
destinyXfate 2:0e2ef1edf01b 771 strm->adler = state->check = adler32(0L, Z_NULL, 0);
destinyXfate 2:0e2ef1edf01b 772 state->mode = TYPE;
destinyXfate 2:0e2ef1edf01b 773 case TYPE:
destinyXfate 2:0e2ef1edf01b 774 if (flush == Z_BLOCK) goto inf_leave;
destinyXfate 2:0e2ef1edf01b 775 case TYPEDO:
destinyXfate 2:0e2ef1edf01b 776 if (state->last) {
destinyXfate 2:0e2ef1edf01b 777 BYTEBITS();
destinyXfate 2:0e2ef1edf01b 778 state->mode = CHECK;
destinyXfate 2:0e2ef1edf01b 779 break;
destinyXfate 2:0e2ef1edf01b 780 }
destinyXfate 2:0e2ef1edf01b 781 NEEDBITS(3);
destinyXfate 2:0e2ef1edf01b 782 state->last = BITS(1);
destinyXfate 2:0e2ef1edf01b 783 DROPBITS(1);
destinyXfate 2:0e2ef1edf01b 784 switch (BITS(2)) {
destinyXfate 2:0e2ef1edf01b 785 case 0: /* stored block */
destinyXfate 2:0e2ef1edf01b 786 Tracev((stderr, "inflate: stored block%s\n",
destinyXfate 2:0e2ef1edf01b 787 state->last ? " (last)" : ""));
destinyXfate 2:0e2ef1edf01b 788 state->mode = STORED;
destinyXfate 2:0e2ef1edf01b 789 break;
destinyXfate 2:0e2ef1edf01b 790 case 1: /* fixed block */
destinyXfate 2:0e2ef1edf01b 791 fixedtables(state);
destinyXfate 2:0e2ef1edf01b 792 Tracev((stderr, "inflate: fixed codes block%s\n",
destinyXfate 2:0e2ef1edf01b 793 state->last ? " (last)" : ""));
destinyXfate 2:0e2ef1edf01b 794 state->mode = LEN; /* decode codes */
destinyXfate 2:0e2ef1edf01b 795 break;
destinyXfate 2:0e2ef1edf01b 796 case 2: /* dynamic block */
destinyXfate 2:0e2ef1edf01b 797 Tracev((stderr, "inflate: dynamic codes block%s\n",
destinyXfate 2:0e2ef1edf01b 798 state->last ? " (last)" : ""));
destinyXfate 2:0e2ef1edf01b 799 state->mode = TABLE;
destinyXfate 2:0e2ef1edf01b 800 break;
destinyXfate 2:0e2ef1edf01b 801 case 3:
destinyXfate 2:0e2ef1edf01b 802 strm->msg = (char *)"invalid block type";
destinyXfate 2:0e2ef1edf01b 803 state->mode = BAD;
destinyXfate 2:0e2ef1edf01b 804 }
destinyXfate 2:0e2ef1edf01b 805 DROPBITS(2);
destinyXfate 2:0e2ef1edf01b 806 break;
destinyXfate 2:0e2ef1edf01b 807 case STORED:
destinyXfate 2:0e2ef1edf01b 808 BYTEBITS(); /* go to byte boundary */
destinyXfate 2:0e2ef1edf01b 809 NEEDBITS(32);
destinyXfate 2:0e2ef1edf01b 810 if ((hold & 0xffff) != ((hold >> 16) ^ 0xffff)) {
destinyXfate 2:0e2ef1edf01b 811 strm->msg = (char *)"invalid stored block lengths";
destinyXfate 2:0e2ef1edf01b 812 state->mode = BAD;
destinyXfate 2:0e2ef1edf01b 813 break;
destinyXfate 2:0e2ef1edf01b 814 }
destinyXfate 2:0e2ef1edf01b 815 state->length = (unsigned)hold & 0xffff;
destinyXfate 2:0e2ef1edf01b 816 Tracev((stderr, "inflate: stored length %u\n",
destinyXfate 2:0e2ef1edf01b 817 state->length));
destinyXfate 2:0e2ef1edf01b 818 INITBITS();
destinyXfate 2:0e2ef1edf01b 819 state->mode = COPY;
destinyXfate 2:0e2ef1edf01b 820 case COPY:
destinyXfate 2:0e2ef1edf01b 821 copy = state->length;
destinyXfate 2:0e2ef1edf01b 822 if (copy) {
destinyXfate 2:0e2ef1edf01b 823 if (copy > have) copy = have;
destinyXfate 2:0e2ef1edf01b 824 if (copy > left) copy = left;
destinyXfate 2:0e2ef1edf01b 825 if (copy == 0) goto inf_leave;
destinyXfate 2:0e2ef1edf01b 826 zmemcpy(put, next, copy);
destinyXfate 2:0e2ef1edf01b 827 have -= copy;
destinyXfate 2:0e2ef1edf01b 828 next += copy;
destinyXfate 2:0e2ef1edf01b 829 left -= copy;
destinyXfate 2:0e2ef1edf01b 830 put += copy;
destinyXfate 2:0e2ef1edf01b 831 state->length -= copy;
destinyXfate 2:0e2ef1edf01b 832 break;
destinyXfate 2:0e2ef1edf01b 833 }
destinyXfate 2:0e2ef1edf01b 834 Tracev((stderr, "inflate: stored end\n"));
destinyXfate 2:0e2ef1edf01b 835 state->mode = TYPE;
destinyXfate 2:0e2ef1edf01b 836 break;
destinyXfate 2:0e2ef1edf01b 837 case TABLE:
destinyXfate 2:0e2ef1edf01b 838 NEEDBITS(14);
destinyXfate 2:0e2ef1edf01b 839 state->nlen = BITS(5) + 257;
destinyXfate 2:0e2ef1edf01b 840 DROPBITS(5);
destinyXfate 2:0e2ef1edf01b 841 state->ndist = BITS(5) + 1;
destinyXfate 2:0e2ef1edf01b 842 DROPBITS(5);
destinyXfate 2:0e2ef1edf01b 843 state->ncode = BITS(4) + 4;
destinyXfate 2:0e2ef1edf01b 844 DROPBITS(4);
destinyXfate 2:0e2ef1edf01b 845 #ifndef PKZIP_BUG_WORKAROUND
destinyXfate 2:0e2ef1edf01b 846 if (state->nlen > 286 || state->ndist > 30) {
destinyXfate 2:0e2ef1edf01b 847 strm->msg = (char *)"too many length or distance symbols";
destinyXfate 2:0e2ef1edf01b 848 state->mode = BAD;
destinyXfate 2:0e2ef1edf01b 849 break;
destinyXfate 2:0e2ef1edf01b 850 }
destinyXfate 2:0e2ef1edf01b 851 #endif
destinyXfate 2:0e2ef1edf01b 852 Tracev((stderr, "inflate: table sizes ok\n"));
destinyXfate 2:0e2ef1edf01b 853 state->have = 0;
destinyXfate 2:0e2ef1edf01b 854 state->mode = LENLENS;
destinyXfate 2:0e2ef1edf01b 855 case LENLENS:
destinyXfate 2:0e2ef1edf01b 856 while (state->have < state->ncode) {
destinyXfate 2:0e2ef1edf01b 857 NEEDBITS(3);
destinyXfate 2:0e2ef1edf01b 858 state->lens[order[state->have++]] = (unsigned short)BITS(3);
destinyXfate 2:0e2ef1edf01b 859 DROPBITS(3);
destinyXfate 2:0e2ef1edf01b 860 }
destinyXfate 2:0e2ef1edf01b 861 while (state->have < 19)
destinyXfate 2:0e2ef1edf01b 862 state->lens[order[state->have++]] = 0;
destinyXfate 2:0e2ef1edf01b 863 state->next = state->codes;
destinyXfate 2:0e2ef1edf01b 864 state->lencode = (code const FAR *)(state->next);
destinyXfate 2:0e2ef1edf01b 865 state->lenbits = 7;
destinyXfate 2:0e2ef1edf01b 866 ret = inflate_table(CODES, state->lens, 19, &(state->next),
destinyXfate 2:0e2ef1edf01b 867 &(state->lenbits), state->work);
destinyXfate 2:0e2ef1edf01b 868 if (ret) {
destinyXfate 2:0e2ef1edf01b 869 strm->msg = (char *)"invalid code lengths set";
destinyXfate 2:0e2ef1edf01b 870 state->mode = BAD;
destinyXfate 2:0e2ef1edf01b 871 break;
destinyXfate 2:0e2ef1edf01b 872 }
destinyXfate 2:0e2ef1edf01b 873 Tracev((stderr, "inflate: code lengths ok\n"));
destinyXfate 2:0e2ef1edf01b 874 state->have = 0;
destinyXfate 2:0e2ef1edf01b 875 state->mode = CODELENS;
destinyXfate 2:0e2ef1edf01b 876 case CODELENS:
destinyXfate 2:0e2ef1edf01b 877 while (state->have < state->nlen + state->ndist) {
destinyXfate 2:0e2ef1edf01b 878 for (;;) {
destinyXfate 2:0e2ef1edf01b 879 this = state->lencode[BITS(state->lenbits)];
destinyXfate 2:0e2ef1edf01b 880 if ((unsigned)(this.bits) <= bits) break;
destinyXfate 2:0e2ef1edf01b 881 PULLBYTE();
destinyXfate 2:0e2ef1edf01b 882 }
destinyXfate 2:0e2ef1edf01b 883 if (this.val < 16) {
destinyXfate 2:0e2ef1edf01b 884 NEEDBITS(this.bits);
destinyXfate 2:0e2ef1edf01b 885 DROPBITS(this.bits);
destinyXfate 2:0e2ef1edf01b 886 state->lens[state->have++] = this.val;
destinyXfate 2:0e2ef1edf01b 887 }
destinyXfate 2:0e2ef1edf01b 888 else {
destinyXfate 2:0e2ef1edf01b 889 if (this.val == 16) {
destinyXfate 2:0e2ef1edf01b 890 NEEDBITS(this.bits + 2);
destinyXfate 2:0e2ef1edf01b 891 DROPBITS(this.bits);
destinyXfate 2:0e2ef1edf01b 892 if (state->have == 0) {
destinyXfate 2:0e2ef1edf01b 893 strm->msg = (char *)"invalid bit length repeat";
destinyXfate 2:0e2ef1edf01b 894 state->mode = BAD;
destinyXfate 2:0e2ef1edf01b 895 break;
destinyXfate 2:0e2ef1edf01b 896 }
destinyXfate 2:0e2ef1edf01b 897 len = state->lens[state->have - 1];
destinyXfate 2:0e2ef1edf01b 898 copy = 3 + BITS(2);
destinyXfate 2:0e2ef1edf01b 899 DROPBITS(2);
destinyXfate 2:0e2ef1edf01b 900 }
destinyXfate 2:0e2ef1edf01b 901 else if (this.val == 17) {
destinyXfate 2:0e2ef1edf01b 902 NEEDBITS(this.bits + 3);
destinyXfate 2:0e2ef1edf01b 903 DROPBITS(this.bits);
destinyXfate 2:0e2ef1edf01b 904 len = 0;
destinyXfate 2:0e2ef1edf01b 905 copy = 3 + BITS(3);
destinyXfate 2:0e2ef1edf01b 906 DROPBITS(3);
destinyXfate 2:0e2ef1edf01b 907 }
destinyXfate 2:0e2ef1edf01b 908 else {
destinyXfate 2:0e2ef1edf01b 909 NEEDBITS(this.bits + 7);
destinyXfate 2:0e2ef1edf01b 910 DROPBITS(this.bits);
destinyXfate 2:0e2ef1edf01b 911 len = 0;
destinyXfate 2:0e2ef1edf01b 912 copy = 11 + BITS(7);
destinyXfate 2:0e2ef1edf01b 913 DROPBITS(7);
destinyXfate 2:0e2ef1edf01b 914 }
destinyXfate 2:0e2ef1edf01b 915 if (state->have + copy > state->nlen + state->ndist) {
destinyXfate 2:0e2ef1edf01b 916 strm->msg = (char *)"invalid bit length repeat";
destinyXfate 2:0e2ef1edf01b 917 state->mode = BAD;
destinyXfate 2:0e2ef1edf01b 918 break;
destinyXfate 2:0e2ef1edf01b 919 }
destinyXfate 2:0e2ef1edf01b 920 while (copy--)
destinyXfate 2:0e2ef1edf01b 921 state->lens[state->have++] = (unsigned short)len;
destinyXfate 2:0e2ef1edf01b 922 }
destinyXfate 2:0e2ef1edf01b 923 }
destinyXfate 2:0e2ef1edf01b 924
destinyXfate 2:0e2ef1edf01b 925 /* handle error breaks in while */
destinyXfate 2:0e2ef1edf01b 926 if (state->mode == BAD) break;
destinyXfate 2:0e2ef1edf01b 927
destinyXfate 2:0e2ef1edf01b 928 /* build code tables */
destinyXfate 2:0e2ef1edf01b 929 state->next = state->codes;
destinyXfate 2:0e2ef1edf01b 930 state->lencode = (code const FAR *)(state->next);
destinyXfate 2:0e2ef1edf01b 931 state->lenbits = 9;
destinyXfate 2:0e2ef1edf01b 932 ret = inflate_table(LENS, state->lens, state->nlen, &(state->next),
destinyXfate 2:0e2ef1edf01b 933 &(state->lenbits), state->work);
destinyXfate 2:0e2ef1edf01b 934 if (ret) {
destinyXfate 2:0e2ef1edf01b 935 strm->msg = (char *)"invalid literal/lengths set";
destinyXfate 2:0e2ef1edf01b 936 state->mode = BAD;
destinyXfate 2:0e2ef1edf01b 937 break;
destinyXfate 2:0e2ef1edf01b 938 }
destinyXfate 2:0e2ef1edf01b 939 state->distcode = (code const FAR *)(state->next);
destinyXfate 2:0e2ef1edf01b 940 state->distbits = 6;
destinyXfate 2:0e2ef1edf01b 941 ret = inflate_table(DISTS, state->lens + state->nlen, state->ndist,
destinyXfate 2:0e2ef1edf01b 942 &(state->next), &(state->distbits), state->work);
destinyXfate 2:0e2ef1edf01b 943 if (ret) {
destinyXfate 2:0e2ef1edf01b 944 strm->msg = (char *)"invalid distances set";
destinyXfate 2:0e2ef1edf01b 945 state->mode = BAD;
destinyXfate 2:0e2ef1edf01b 946 break;
destinyXfate 2:0e2ef1edf01b 947 }
destinyXfate 2:0e2ef1edf01b 948 Tracev((stderr, "inflate: codes ok\n"));
destinyXfate 2:0e2ef1edf01b 949 state->mode = LEN;
destinyXfate 2:0e2ef1edf01b 950 case LEN:
destinyXfate 2:0e2ef1edf01b 951 if (have >= 6 && left >= 258) {
destinyXfate 2:0e2ef1edf01b 952 RESTORE();
destinyXfate 2:0e2ef1edf01b 953 inflate_fast(strm, out);
destinyXfate 2:0e2ef1edf01b 954 LOAD();
destinyXfate 2:0e2ef1edf01b 955 break;
destinyXfate 2:0e2ef1edf01b 956 }
destinyXfate 2:0e2ef1edf01b 957 for (;;) {
destinyXfate 2:0e2ef1edf01b 958 this = state->lencode[BITS(state->lenbits)];
destinyXfate 2:0e2ef1edf01b 959 if ((unsigned)(this.bits) <= bits) break;
destinyXfate 2:0e2ef1edf01b 960 PULLBYTE();
destinyXfate 2:0e2ef1edf01b 961 }
destinyXfate 2:0e2ef1edf01b 962 if (this.op && (this.op & 0xf0) == 0) {
destinyXfate 2:0e2ef1edf01b 963 last = this;
destinyXfate 2:0e2ef1edf01b 964 for (;;) {
destinyXfate 2:0e2ef1edf01b 965 this = state->lencode[last.val +
destinyXfate 2:0e2ef1edf01b 966 (BITS(last.bits + last.op) >> last.bits)];
destinyXfate 2:0e2ef1edf01b 967 if ((unsigned)(last.bits + this.bits) <= bits) break;
destinyXfate 2:0e2ef1edf01b 968 PULLBYTE();
destinyXfate 2:0e2ef1edf01b 969 }
destinyXfate 2:0e2ef1edf01b 970 DROPBITS(last.bits);
destinyXfate 2:0e2ef1edf01b 971 }
destinyXfate 2:0e2ef1edf01b 972 DROPBITS(this.bits);
destinyXfate 2:0e2ef1edf01b 973 state->length = (unsigned)this.val;
destinyXfate 2:0e2ef1edf01b 974 if ((int)(this.op) == 0) {
destinyXfate 2:0e2ef1edf01b 975 Tracevv((stderr, this.val >= 0x20 && this.val < 0x7f ?
destinyXfate 2:0e2ef1edf01b 976 "inflate: literal '%c'\n" :
destinyXfate 2:0e2ef1edf01b 977 "inflate: literal 0x%02x\n", this.val));
destinyXfate 2:0e2ef1edf01b 978 state->mode = LIT;
destinyXfate 2:0e2ef1edf01b 979 break;
destinyXfate 2:0e2ef1edf01b 980 }
destinyXfate 2:0e2ef1edf01b 981 if (this.op & 32) {
destinyXfate 2:0e2ef1edf01b 982 Tracevv((stderr, "inflate: end of block\n"));
destinyXfate 2:0e2ef1edf01b 983 state->mode = TYPE;
destinyXfate 2:0e2ef1edf01b 984 break;
destinyXfate 2:0e2ef1edf01b 985 }
destinyXfate 2:0e2ef1edf01b 986 if (this.op & 64) {
destinyXfate 2:0e2ef1edf01b 987 strm->msg = (char *)"invalid literal/length code";
destinyXfate 2:0e2ef1edf01b 988 state->mode = BAD;
destinyXfate 2:0e2ef1edf01b 989 break;
destinyXfate 2:0e2ef1edf01b 990 }
destinyXfate 2:0e2ef1edf01b 991 state->extra = (unsigned)(this.op) & 15;
destinyXfate 2:0e2ef1edf01b 992 state->mode = LENEXT;
destinyXfate 2:0e2ef1edf01b 993 case LENEXT:
destinyXfate 2:0e2ef1edf01b 994 if (state->extra) {
destinyXfate 2:0e2ef1edf01b 995 NEEDBITS(state->extra);
destinyXfate 2:0e2ef1edf01b 996 state->length += BITS(state->extra);
destinyXfate 2:0e2ef1edf01b 997 DROPBITS(state->extra);
destinyXfate 2:0e2ef1edf01b 998 }
destinyXfate 2:0e2ef1edf01b 999 Tracevv((stderr, "inflate: length %u\n", state->length));
destinyXfate 2:0e2ef1edf01b 1000 state->mode = DIST;
destinyXfate 2:0e2ef1edf01b 1001 case DIST:
destinyXfate 2:0e2ef1edf01b 1002 for (;;) {
destinyXfate 2:0e2ef1edf01b 1003 this = state->distcode[BITS(state->distbits)];
destinyXfate 2:0e2ef1edf01b 1004 if ((unsigned)(this.bits) <= bits) break;
destinyXfate 2:0e2ef1edf01b 1005 PULLBYTE();
destinyXfate 2:0e2ef1edf01b 1006 }
destinyXfate 2:0e2ef1edf01b 1007 if ((this.op & 0xf0) == 0) {
destinyXfate 2:0e2ef1edf01b 1008 last = this;
destinyXfate 2:0e2ef1edf01b 1009 for (;;) {
destinyXfate 2:0e2ef1edf01b 1010 this = state->distcode[last.val +
destinyXfate 2:0e2ef1edf01b 1011 (BITS(last.bits + last.op) >> last.bits)];
destinyXfate 2:0e2ef1edf01b 1012 if ((unsigned)(last.bits + this.bits) <= bits) break;
destinyXfate 2:0e2ef1edf01b 1013 PULLBYTE();
destinyXfate 2:0e2ef1edf01b 1014 }
destinyXfate 2:0e2ef1edf01b 1015 DROPBITS(last.bits);
destinyXfate 2:0e2ef1edf01b 1016 }
destinyXfate 2:0e2ef1edf01b 1017 DROPBITS(this.bits);
destinyXfate 2:0e2ef1edf01b 1018 if (this.op & 64) {
destinyXfate 2:0e2ef1edf01b 1019 strm->msg = (char *)"invalid distance code";
destinyXfate 2:0e2ef1edf01b 1020 state->mode = BAD;
destinyXfate 2:0e2ef1edf01b 1021 break;
destinyXfate 2:0e2ef1edf01b 1022 }
destinyXfate 2:0e2ef1edf01b 1023 state->offset = (unsigned)this.val;
destinyXfate 2:0e2ef1edf01b 1024 state->extra = (unsigned)(this.op) & 15;
destinyXfate 2:0e2ef1edf01b 1025 state->mode = DISTEXT;
destinyXfate 2:0e2ef1edf01b 1026 case DISTEXT:
destinyXfate 2:0e2ef1edf01b 1027 if (state->extra) {
destinyXfate 2:0e2ef1edf01b 1028 NEEDBITS(state->extra);
destinyXfate 2:0e2ef1edf01b 1029 state->offset += BITS(state->extra);
destinyXfate 2:0e2ef1edf01b 1030 DROPBITS(state->extra);
destinyXfate 2:0e2ef1edf01b 1031 }
destinyXfate 2:0e2ef1edf01b 1032 #ifdef INFLATE_STRICT
destinyXfate 2:0e2ef1edf01b 1033 if (state->offset > state->dmax) {
destinyXfate 2:0e2ef1edf01b 1034 strm->msg = (char *)"invalid distance too far back";
destinyXfate 2:0e2ef1edf01b 1035 state->mode = BAD;
destinyXfate 2:0e2ef1edf01b 1036 break;
destinyXfate 2:0e2ef1edf01b 1037 }
destinyXfate 2:0e2ef1edf01b 1038 #endif
destinyXfate 2:0e2ef1edf01b 1039 if (state->offset > state->whave + out - left) {
destinyXfate 2:0e2ef1edf01b 1040 strm->msg = (char *)"invalid distance too far back";
destinyXfate 2:0e2ef1edf01b 1041 state->mode = BAD;
destinyXfate 2:0e2ef1edf01b 1042 break;
destinyXfate 2:0e2ef1edf01b 1043 }
destinyXfate 2:0e2ef1edf01b 1044 Tracevv((stderr, "inflate: distance %u\n", state->offset));
destinyXfate 2:0e2ef1edf01b 1045 state->mode = MATCH;
destinyXfate 2:0e2ef1edf01b 1046 case MATCH:
destinyXfate 2:0e2ef1edf01b 1047 if (left == 0) goto inf_leave;
destinyXfate 2:0e2ef1edf01b 1048 copy = out - left;
destinyXfate 2:0e2ef1edf01b 1049 if (state->offset > copy) { /* copy from window */
destinyXfate 2:0e2ef1edf01b 1050 copy = state->offset - copy;
destinyXfate 2:0e2ef1edf01b 1051 if (copy > state->write) {
destinyXfate 2:0e2ef1edf01b 1052 copy -= state->write;
destinyXfate 2:0e2ef1edf01b 1053 from = state->window + (state->wsize - copy);
destinyXfate 2:0e2ef1edf01b 1054 }
destinyXfate 2:0e2ef1edf01b 1055 else
destinyXfate 2:0e2ef1edf01b 1056 from = state->window + (state->write - copy);
destinyXfate 2:0e2ef1edf01b 1057 if (copy > state->length) copy = state->length;
destinyXfate 2:0e2ef1edf01b 1058 }
destinyXfate 2:0e2ef1edf01b 1059 else { /* copy from output */
destinyXfate 2:0e2ef1edf01b 1060 from = put - state->offset;
destinyXfate 2:0e2ef1edf01b 1061 copy = state->length;
destinyXfate 2:0e2ef1edf01b 1062 }
destinyXfate 2:0e2ef1edf01b 1063 if (copy > left) copy = left;
destinyXfate 2:0e2ef1edf01b 1064 left -= copy;
destinyXfate 2:0e2ef1edf01b 1065 state->length -= copy;
destinyXfate 2:0e2ef1edf01b 1066 do {
destinyXfate 2:0e2ef1edf01b 1067 *put++ = *from++;
destinyXfate 2:0e2ef1edf01b 1068 } while (--copy);
destinyXfate 2:0e2ef1edf01b 1069 if (state->length == 0) state->mode = LEN;
destinyXfate 2:0e2ef1edf01b 1070 break;
destinyXfate 2:0e2ef1edf01b 1071 case LIT:
destinyXfate 2:0e2ef1edf01b 1072 if (left == 0) goto inf_leave;
destinyXfate 2:0e2ef1edf01b 1073 *put++ = (unsigned char)(state->length);
destinyXfate 2:0e2ef1edf01b 1074 left--;
destinyXfate 2:0e2ef1edf01b 1075 state->mode = LEN;
destinyXfate 2:0e2ef1edf01b 1076 break;
destinyXfate 2:0e2ef1edf01b 1077 case CHECK:
destinyXfate 2:0e2ef1edf01b 1078 if (state->wrap) {
destinyXfate 2:0e2ef1edf01b 1079 NEEDBITS(32);
destinyXfate 2:0e2ef1edf01b 1080 out -= left;
destinyXfate 2:0e2ef1edf01b 1081 strm->total_out += out;
destinyXfate 2:0e2ef1edf01b 1082 state->total += out;
destinyXfate 2:0e2ef1edf01b 1083 if (out)
destinyXfate 2:0e2ef1edf01b 1084 strm->adler = state->check =
destinyXfate 2:0e2ef1edf01b 1085 UPDATE(state->check, put - out, out);
destinyXfate 2:0e2ef1edf01b 1086 out = left;
destinyXfate 2:0e2ef1edf01b 1087 if ((
destinyXfate 2:0e2ef1edf01b 1088 #ifdef GUNZIP
destinyXfate 2:0e2ef1edf01b 1089 state->flags ? hold :
destinyXfate 2:0e2ef1edf01b 1090 #endif
destinyXfate 2:0e2ef1edf01b 1091 REVERSE(hold)) != state->check) {
destinyXfate 2:0e2ef1edf01b 1092 strm->msg = (char *)"incorrect data check";
destinyXfate 2:0e2ef1edf01b 1093 state->mode = BAD;
destinyXfate 2:0e2ef1edf01b 1094 break;
destinyXfate 2:0e2ef1edf01b 1095 }
destinyXfate 2:0e2ef1edf01b 1096 INITBITS();
destinyXfate 2:0e2ef1edf01b 1097 Tracev((stderr, "inflate: check matches trailer\n"));
destinyXfate 2:0e2ef1edf01b 1098 }
destinyXfate 2:0e2ef1edf01b 1099 #ifdef GUNZIP
destinyXfate 2:0e2ef1edf01b 1100 state->mode = LENGTH;
destinyXfate 2:0e2ef1edf01b 1101 case LENGTH:
destinyXfate 2:0e2ef1edf01b 1102 if (state->wrap && state->flags) {
destinyXfate 2:0e2ef1edf01b 1103 NEEDBITS(32);
destinyXfate 2:0e2ef1edf01b 1104 if (hold != (state->total & 0xffffffffUL)) {
destinyXfate 2:0e2ef1edf01b 1105 strm->msg = (char *)"incorrect length check";
destinyXfate 2:0e2ef1edf01b 1106 state->mode = BAD;
destinyXfate 2:0e2ef1edf01b 1107 break;
destinyXfate 2:0e2ef1edf01b 1108 }
destinyXfate 2:0e2ef1edf01b 1109 INITBITS();
destinyXfate 2:0e2ef1edf01b 1110 Tracev((stderr, "inflate: length matches trailer\n"));
destinyXfate 2:0e2ef1edf01b 1111 }
destinyXfate 2:0e2ef1edf01b 1112 #endif
destinyXfate 2:0e2ef1edf01b 1113 state->mode = DONE;
destinyXfate 2:0e2ef1edf01b 1114 case DONE:
destinyXfate 2:0e2ef1edf01b 1115 ret = Z_STREAM_END;
destinyXfate 2:0e2ef1edf01b 1116 goto inf_leave;
destinyXfate 2:0e2ef1edf01b 1117 case BAD:
destinyXfate 2:0e2ef1edf01b 1118 ret = Z_DATA_ERROR;
destinyXfate 2:0e2ef1edf01b 1119 goto inf_leave;
destinyXfate 2:0e2ef1edf01b 1120 case MEM:
destinyXfate 2:0e2ef1edf01b 1121 return Z_MEM_ERROR;
destinyXfate 2:0e2ef1edf01b 1122 case SYNC:
destinyXfate 2:0e2ef1edf01b 1123 default:
destinyXfate 2:0e2ef1edf01b 1124 return Z_STREAM_ERROR;
destinyXfate 2:0e2ef1edf01b 1125 }
destinyXfate 2:0e2ef1edf01b 1126
destinyXfate 2:0e2ef1edf01b 1127 /*
destinyXfate 2:0e2ef1edf01b 1128 Return from inflate(), updating the total counts and the check value.
destinyXfate 2:0e2ef1edf01b 1129 If there was no progress during the inflate() call, return a buffer
destinyXfate 2:0e2ef1edf01b 1130 error. Call updatewindow() to create and/or update the window state.
destinyXfate 2:0e2ef1edf01b 1131 Note: a memory error from inflate() is non-recoverable.
destinyXfate 2:0e2ef1edf01b 1132 */
destinyXfate 2:0e2ef1edf01b 1133 inf_leave:
destinyXfate 2:0e2ef1edf01b 1134 RESTORE();
destinyXfate 2:0e2ef1edf01b 1135 if (state->wsize || (state->mode < CHECK && out != strm->avail_out))
destinyXfate 2:0e2ef1edf01b 1136 if (updatewindow(strm, out)) {
destinyXfate 2:0e2ef1edf01b 1137 state->mode = MEM;
destinyXfate 2:0e2ef1edf01b 1138 return Z_MEM_ERROR;
destinyXfate 2:0e2ef1edf01b 1139 }
destinyXfate 2:0e2ef1edf01b 1140 in -= strm->avail_in;
destinyXfate 2:0e2ef1edf01b 1141 out -= strm->avail_out;
destinyXfate 2:0e2ef1edf01b 1142 strm->total_in += in;
destinyXfate 2:0e2ef1edf01b 1143 strm->total_out += out;
destinyXfate 2:0e2ef1edf01b 1144 state->total += out;
destinyXfate 2:0e2ef1edf01b 1145 if (state->wrap && out)
destinyXfate 2:0e2ef1edf01b 1146 strm->adler = state->check =
destinyXfate 2:0e2ef1edf01b 1147 UPDATE(state->check, strm->next_out - out, out);
destinyXfate 2:0e2ef1edf01b 1148 strm->data_type = state->bits + (state->last ? 64 : 0) +
destinyXfate 2:0e2ef1edf01b 1149 (state->mode == TYPE ? 128 : 0);
destinyXfate 2:0e2ef1edf01b 1150 if (((in == 0 && out == 0) || flush == Z_FINISH) && ret == Z_OK)
destinyXfate 2:0e2ef1edf01b 1151 ret = Z_BUF_ERROR;
destinyXfate 2:0e2ef1edf01b 1152 return ret;
destinyXfate 2:0e2ef1edf01b 1153 }
destinyXfate 2:0e2ef1edf01b 1154
destinyXfate 2:0e2ef1edf01b 1155 int ZEXPORT inflateEnd(strm)
destinyXfate 2:0e2ef1edf01b 1156 z_streamp strm;
destinyXfate 2:0e2ef1edf01b 1157 {
destinyXfate 2:0e2ef1edf01b 1158 struct inflate_state FAR *state;
destinyXfate 2:0e2ef1edf01b 1159 if (strm == Z_NULL || strm->state == Z_NULL || strm->zfree == (free_func)0)
destinyXfate 2:0e2ef1edf01b 1160 return Z_STREAM_ERROR;
destinyXfate 2:0e2ef1edf01b 1161 state = (struct inflate_state FAR *)strm->state;
destinyXfate 2:0e2ef1edf01b 1162 if (state->window != Z_NULL) ZFREE(strm, state->window);
destinyXfate 2:0e2ef1edf01b 1163 ZFREE(strm, strm->state);
destinyXfate 2:0e2ef1edf01b 1164 strm->state = Z_NULL;
destinyXfate 2:0e2ef1edf01b 1165 Tracev((stderr, "inflate: end\n"));
destinyXfate 2:0e2ef1edf01b 1166 return Z_OK;
destinyXfate 2:0e2ef1edf01b 1167 }
destinyXfate 2:0e2ef1edf01b 1168
destinyXfate 2:0e2ef1edf01b 1169 int ZEXPORT inflateSetDictionary(strm, dictionary, dictLength)
destinyXfate 2:0e2ef1edf01b 1170 z_streamp strm;
destinyXfate 2:0e2ef1edf01b 1171 const Bytef *dictionary;
destinyXfate 2:0e2ef1edf01b 1172 uInt dictLength;
destinyXfate 2:0e2ef1edf01b 1173 {
destinyXfate 2:0e2ef1edf01b 1174 struct inflate_state FAR *state;
destinyXfate 2:0e2ef1edf01b 1175 unsigned long id;
destinyXfate 2:0e2ef1edf01b 1176
destinyXfate 2:0e2ef1edf01b 1177 /* check state */
destinyXfate 2:0e2ef1edf01b 1178 if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR;
destinyXfate 2:0e2ef1edf01b 1179 state = (struct inflate_state FAR *)strm->state;
destinyXfate 2:0e2ef1edf01b 1180 if (state->wrap != 0 && state->mode != DICT)
destinyXfate 2:0e2ef1edf01b 1181 return Z_STREAM_ERROR;
destinyXfate 2:0e2ef1edf01b 1182
destinyXfate 2:0e2ef1edf01b 1183 /* check for correct dictionary id */
destinyXfate 2:0e2ef1edf01b 1184 if (state->mode == DICT) {
destinyXfate 2:0e2ef1edf01b 1185 id = adler32(0L, Z_NULL, 0);
destinyXfate 2:0e2ef1edf01b 1186 id = adler32(id, dictionary, dictLength);
destinyXfate 2:0e2ef1edf01b 1187 if (id != state->check)
destinyXfate 2:0e2ef1edf01b 1188 return Z_DATA_ERROR;
destinyXfate 2:0e2ef1edf01b 1189 }
destinyXfate 2:0e2ef1edf01b 1190
destinyXfate 2:0e2ef1edf01b 1191 /* copy dictionary to window */
destinyXfate 2:0e2ef1edf01b 1192 if (updatewindow(strm, strm->avail_out)) {
destinyXfate 2:0e2ef1edf01b 1193 state->mode = MEM;
destinyXfate 2:0e2ef1edf01b 1194 return Z_MEM_ERROR;
destinyXfate 2:0e2ef1edf01b 1195 }
destinyXfate 2:0e2ef1edf01b 1196 if (dictLength > state->wsize) {
destinyXfate 2:0e2ef1edf01b 1197 zmemcpy(state->window, dictionary + dictLength - state->wsize,
destinyXfate 2:0e2ef1edf01b 1198 state->wsize);
destinyXfate 2:0e2ef1edf01b 1199 state->whave = state->wsize;
destinyXfate 2:0e2ef1edf01b 1200 }
destinyXfate 2:0e2ef1edf01b 1201 else {
destinyXfate 2:0e2ef1edf01b 1202 zmemcpy(state->window + state->wsize - dictLength, dictionary,
destinyXfate 2:0e2ef1edf01b 1203 dictLength);
destinyXfate 2:0e2ef1edf01b 1204 state->whave = dictLength;
destinyXfate 2:0e2ef1edf01b 1205 }
destinyXfate 2:0e2ef1edf01b 1206 state->havedict = 1;
destinyXfate 2:0e2ef1edf01b 1207 Tracev((stderr, "inflate: dictionary set\n"));
destinyXfate 2:0e2ef1edf01b 1208 return Z_OK;
destinyXfate 2:0e2ef1edf01b 1209 }
destinyXfate 2:0e2ef1edf01b 1210
destinyXfate 2:0e2ef1edf01b 1211 int ZEXPORT inflateGetHeader(strm, head)
destinyXfate 2:0e2ef1edf01b 1212 z_streamp strm;
destinyXfate 2:0e2ef1edf01b 1213 gz_headerp head;
destinyXfate 2:0e2ef1edf01b 1214 {
destinyXfate 2:0e2ef1edf01b 1215 struct inflate_state FAR *state;
destinyXfate 2:0e2ef1edf01b 1216
destinyXfate 2:0e2ef1edf01b 1217 /* check state */
destinyXfate 2:0e2ef1edf01b 1218 if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR;
destinyXfate 2:0e2ef1edf01b 1219 state = (struct inflate_state FAR *)strm->state;
destinyXfate 2:0e2ef1edf01b 1220 if ((state->wrap & 2) == 0) return Z_STREAM_ERROR;
destinyXfate 2:0e2ef1edf01b 1221
destinyXfate 2:0e2ef1edf01b 1222 /* save header structure */
destinyXfate 2:0e2ef1edf01b 1223 state->head = head;
destinyXfate 2:0e2ef1edf01b 1224 head->done = 0;
destinyXfate 2:0e2ef1edf01b 1225 return Z_OK;
destinyXfate 2:0e2ef1edf01b 1226 }
destinyXfate 2:0e2ef1edf01b 1227
destinyXfate 2:0e2ef1edf01b 1228 /*
destinyXfate 2:0e2ef1edf01b 1229 Search buf[0..len-1] for the pattern: 0, 0, 0xff, 0xff. Return when found
destinyXfate 2:0e2ef1edf01b 1230 or when out of input. When called, *have is the number of pattern bytes
destinyXfate 2:0e2ef1edf01b 1231 found in order so far, in 0..3. On return *have is updated to the new
destinyXfate 2:0e2ef1edf01b 1232 state. If on return *have equals four, then the pattern was found and the
destinyXfate 2:0e2ef1edf01b 1233 return value is how many bytes were read including the last byte of the
destinyXfate 2:0e2ef1edf01b 1234 pattern. If *have is less than four, then the pattern has not been found
destinyXfate 2:0e2ef1edf01b 1235 yet and the return value is len. In the latter case, syncsearch() can be
destinyXfate 2:0e2ef1edf01b 1236 called again with more data and the *have state. *have is initialized to
destinyXfate 2:0e2ef1edf01b 1237 zero for the first call.
destinyXfate 2:0e2ef1edf01b 1238 */
destinyXfate 2:0e2ef1edf01b 1239 local unsigned syncsearch(have, buf, len)
destinyXfate 2:0e2ef1edf01b 1240 unsigned FAR *have;
destinyXfate 2:0e2ef1edf01b 1241 unsigned char FAR *buf;
destinyXfate 2:0e2ef1edf01b 1242 unsigned len;
destinyXfate 2:0e2ef1edf01b 1243 {
destinyXfate 2:0e2ef1edf01b 1244 unsigned got;
destinyXfate 2:0e2ef1edf01b 1245 unsigned next;
destinyXfate 2:0e2ef1edf01b 1246
destinyXfate 2:0e2ef1edf01b 1247 got = *have;
destinyXfate 2:0e2ef1edf01b 1248 next = 0;
destinyXfate 2:0e2ef1edf01b 1249 while (next < len && got < 4) {
destinyXfate 2:0e2ef1edf01b 1250 if ((int)(buf[next]) == (got < 2 ? 0 : 0xff))
destinyXfate 2:0e2ef1edf01b 1251 got++;
destinyXfate 2:0e2ef1edf01b 1252 else if (buf[next])
destinyXfate 2:0e2ef1edf01b 1253 got = 0;
destinyXfate 2:0e2ef1edf01b 1254 else
destinyXfate 2:0e2ef1edf01b 1255 got = 4 - got;
destinyXfate 2:0e2ef1edf01b 1256 next++;
destinyXfate 2:0e2ef1edf01b 1257 }
destinyXfate 2:0e2ef1edf01b 1258 *have = got;
destinyXfate 2:0e2ef1edf01b 1259 return next;
destinyXfate 2:0e2ef1edf01b 1260 }
destinyXfate 2:0e2ef1edf01b 1261
destinyXfate 2:0e2ef1edf01b 1262 int ZEXPORT inflateSync(strm)
destinyXfate 2:0e2ef1edf01b 1263 z_streamp strm;
destinyXfate 2:0e2ef1edf01b 1264 {
destinyXfate 2:0e2ef1edf01b 1265 unsigned len; /* number of bytes to look at or looked at */
destinyXfate 2:0e2ef1edf01b 1266 unsigned long in, out; /* temporary to save total_in and total_out */
destinyXfate 2:0e2ef1edf01b 1267 unsigned char buf[4]; /* to restore bit buffer to byte string */
destinyXfate 2:0e2ef1edf01b 1268 struct inflate_state FAR *state;
destinyXfate 2:0e2ef1edf01b 1269
destinyXfate 2:0e2ef1edf01b 1270 /* check parameters */
destinyXfate 2:0e2ef1edf01b 1271 if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR;
destinyXfate 2:0e2ef1edf01b 1272 state = (struct inflate_state FAR *)strm->state;
destinyXfate 2:0e2ef1edf01b 1273 if (strm->avail_in == 0 && state->bits < 8) return Z_BUF_ERROR;
destinyXfate 2:0e2ef1edf01b 1274
destinyXfate 2:0e2ef1edf01b 1275 /* if first time, start search in bit buffer */
destinyXfate 2:0e2ef1edf01b 1276 if (state->mode != SYNC) {
destinyXfate 2:0e2ef1edf01b 1277 state->mode = SYNC;
destinyXfate 2:0e2ef1edf01b 1278 state->hold <<= state->bits & 7;
destinyXfate 2:0e2ef1edf01b 1279 state->bits -= state->bits & 7;
destinyXfate 2:0e2ef1edf01b 1280 len = 0;
destinyXfate 2:0e2ef1edf01b 1281 while (state->bits >= 8) {
destinyXfate 2:0e2ef1edf01b 1282 buf[len++] = (unsigned char)(state->hold);
destinyXfate 2:0e2ef1edf01b 1283 state->hold >>= 8;
destinyXfate 2:0e2ef1edf01b 1284 state->bits -= 8;
destinyXfate 2:0e2ef1edf01b 1285 }
destinyXfate 2:0e2ef1edf01b 1286 state->have = 0;
destinyXfate 2:0e2ef1edf01b 1287 syncsearch(&(state->have), buf, len);
destinyXfate 2:0e2ef1edf01b 1288 }
destinyXfate 2:0e2ef1edf01b 1289
destinyXfate 2:0e2ef1edf01b 1290 /* search available input */
destinyXfate 2:0e2ef1edf01b 1291 len = syncsearch(&(state->have), strm->next_in, strm->avail_in);
destinyXfate 2:0e2ef1edf01b 1292 strm->avail_in -= len;
destinyXfate 2:0e2ef1edf01b 1293 strm->next_in += len;
destinyXfate 2:0e2ef1edf01b 1294 strm->total_in += len;
destinyXfate 2:0e2ef1edf01b 1295
destinyXfate 2:0e2ef1edf01b 1296 /* return no joy or set up to restart inflate() on a new block */
destinyXfate 2:0e2ef1edf01b 1297 if (state->have != 4) return Z_DATA_ERROR;
destinyXfate 2:0e2ef1edf01b 1298 in = strm->total_in; out = strm->total_out;
destinyXfate 2:0e2ef1edf01b 1299 inflateReset(strm);
destinyXfate 2:0e2ef1edf01b 1300 strm->total_in = in; strm->total_out = out;
destinyXfate 2:0e2ef1edf01b 1301 state->mode = TYPE;
destinyXfate 2:0e2ef1edf01b 1302 return Z_OK;
destinyXfate 2:0e2ef1edf01b 1303 }
destinyXfate 2:0e2ef1edf01b 1304
destinyXfate 2:0e2ef1edf01b 1305 /*
destinyXfate 2:0e2ef1edf01b 1306 Returns true if inflate is currently at the end of a block generated by
destinyXfate 2:0e2ef1edf01b 1307 Z_SYNC_FLUSH or Z_FULL_FLUSH. This function is used by one PPP
destinyXfate 2:0e2ef1edf01b 1308 implementation to provide an additional safety check. PPP uses
destinyXfate 2:0e2ef1edf01b 1309 Z_SYNC_FLUSH but removes the length bytes of the resulting empty stored
destinyXfate 2:0e2ef1edf01b 1310 block. When decompressing, PPP checks that at the end of input packet,
destinyXfate 2:0e2ef1edf01b 1311 inflate is waiting for these length bytes.
destinyXfate 2:0e2ef1edf01b 1312 */
destinyXfate 2:0e2ef1edf01b 1313 int ZEXPORT inflateSyncPoint(strm)
destinyXfate 2:0e2ef1edf01b 1314 z_streamp strm;
destinyXfate 2:0e2ef1edf01b 1315 {
destinyXfate 2:0e2ef1edf01b 1316 struct inflate_state FAR *state;
destinyXfate 2:0e2ef1edf01b 1317
destinyXfate 2:0e2ef1edf01b 1318 if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR;
destinyXfate 2:0e2ef1edf01b 1319 state = (struct inflate_state FAR *)strm->state;
destinyXfate 2:0e2ef1edf01b 1320 return state->mode == STORED && state->bits == 0;
destinyXfate 2:0e2ef1edf01b 1321 }
destinyXfate 2:0e2ef1edf01b 1322
destinyXfate 2:0e2ef1edf01b 1323 int ZEXPORT inflateCopy(dest, source)
destinyXfate 2:0e2ef1edf01b 1324 z_streamp dest;
destinyXfate 2:0e2ef1edf01b 1325 z_streamp source;
destinyXfate 2:0e2ef1edf01b 1326 {
destinyXfate 2:0e2ef1edf01b 1327 struct inflate_state FAR *state;
destinyXfate 2:0e2ef1edf01b 1328 struct inflate_state FAR *copy;
destinyXfate 2:0e2ef1edf01b 1329 unsigned char FAR *window;
destinyXfate 2:0e2ef1edf01b 1330 unsigned wsize;
destinyXfate 2:0e2ef1edf01b 1331
destinyXfate 2:0e2ef1edf01b 1332 /* check input */
destinyXfate 2:0e2ef1edf01b 1333 if (dest == Z_NULL || source == Z_NULL || source->state == Z_NULL ||
destinyXfate 2:0e2ef1edf01b 1334 source->zalloc == (alloc_func)0 || source->zfree == (free_func)0)
destinyXfate 2:0e2ef1edf01b 1335 return Z_STREAM_ERROR;
destinyXfate 2:0e2ef1edf01b 1336 state = (struct inflate_state FAR *)source->state;
destinyXfate 2:0e2ef1edf01b 1337
destinyXfate 2:0e2ef1edf01b 1338 /* allocate space */
destinyXfate 2:0e2ef1edf01b 1339 copy = (struct inflate_state FAR *)
destinyXfate 2:0e2ef1edf01b 1340 ZALLOC(source, 1, sizeof(struct inflate_state));
destinyXfate 2:0e2ef1edf01b 1341 if (copy == Z_NULL) return Z_MEM_ERROR;
destinyXfate 2:0e2ef1edf01b 1342 window = Z_NULL;
destinyXfate 2:0e2ef1edf01b 1343 if (state->window != Z_NULL) {
destinyXfate 2:0e2ef1edf01b 1344 window = (unsigned char FAR *)
destinyXfate 2:0e2ef1edf01b 1345 ZALLOC(source, 1U << state->wbits, sizeof(unsigned char));
destinyXfate 2:0e2ef1edf01b 1346 if (window == Z_NULL) {
destinyXfate 2:0e2ef1edf01b 1347 ZFREE(source, copy);
destinyXfate 2:0e2ef1edf01b 1348 return Z_MEM_ERROR;
destinyXfate 2:0e2ef1edf01b 1349 }
destinyXfate 2:0e2ef1edf01b 1350 }
destinyXfate 2:0e2ef1edf01b 1351
destinyXfate 2:0e2ef1edf01b 1352 /* copy state */
destinyXfate 2:0e2ef1edf01b 1353 zmemcpy(dest, source, sizeof(z_stream));
destinyXfate 2:0e2ef1edf01b 1354 zmemcpy(copy, state, sizeof(struct inflate_state));
destinyXfate 2:0e2ef1edf01b 1355 if (state->lencode >= state->codes &&
destinyXfate 2:0e2ef1edf01b 1356 state->lencode <= state->codes + ENOUGH - 1) {
destinyXfate 2:0e2ef1edf01b 1357 copy->lencode = copy->codes + (state->lencode - state->codes);
destinyXfate 2:0e2ef1edf01b 1358 copy->distcode = copy->codes + (state->distcode - state->codes);
destinyXfate 2:0e2ef1edf01b 1359 }
destinyXfate 2:0e2ef1edf01b 1360 copy->next = copy->codes + (state->next - state->codes);
destinyXfate 2:0e2ef1edf01b 1361 if (window != Z_NULL) {
destinyXfate 2:0e2ef1edf01b 1362 wsize = 1U << state->wbits;
destinyXfate 2:0e2ef1edf01b 1363 zmemcpy(window, state->window, wsize);
destinyXfate 2:0e2ef1edf01b 1364 }
destinyXfate 2:0e2ef1edf01b 1365 copy->window = window;
destinyXfate 2:0e2ef1edf01b 1366 dest->state = (struct internal_state FAR *)copy;
destinyXfate 2:0e2ef1edf01b 1367 return Z_OK;
destinyXfate 2:0e2ef1edf01b 1368 }
destinyXfate 2:0e2ef1edf01b 1369