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Dependencies:   mbed-rtos mbed

zlib/inflate.c@0:54f5be781526, 2012-10-21 (annotated)

Committer:
jonathonfletcher
Date:
Sun Oct 21 07:46:41 2012 +0000
Revision:
0:54f5be781526
initial checkin

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jonathonfletcher 0:54f5be781526 1 /* inflate.c -- zlib decompression
jonathonfletcher 0:54f5be781526 2 * Copyright (C) 1995-2012 Mark Adler
jonathonfletcher 0:54f5be781526 3 * For conditions of distribution and use, see copyright notice in zlib.h
jonathonfletcher 0:54f5be781526 4 */
jonathonfletcher 0:54f5be781526 5
jonathonfletcher 0:54f5be781526 6 /*
jonathonfletcher 0:54f5be781526 7 * Change history:
jonathonfletcher 0:54f5be781526 8 *
jonathonfletcher 0:54f5be781526 9 * 1.2.beta0 24 Nov 2002
jonathonfletcher 0:54f5be781526 10 * - First version -- complete rewrite of inflate to simplify code, avoid
jonathonfletcher 0:54f5be781526 11 * creation of window when not needed, minimize use of window when it is
jonathonfletcher 0:54f5be781526 12 * needed, make inffast.c even faster, implement gzip decoding, and to
jonathonfletcher 0:54f5be781526 13 * improve code readability and style over the previous zlib inflate code
jonathonfletcher 0:54f5be781526 14 *
jonathonfletcher 0:54f5be781526 15 * 1.2.beta1 25 Nov 2002
jonathonfletcher 0:54f5be781526 16 * - Use pointers for available input and output checking in inffast.c
jonathonfletcher 0:54f5be781526 17 * - Remove input and output counters in inffast.c
jonathonfletcher 0:54f5be781526 18 * - Change inffast.c entry and loop from avail_in >= 7 to >= 6
jonathonfletcher 0:54f5be781526 19 * - Remove unnecessary second byte pull from length extra in inffast.c
jonathonfletcher 0:54f5be781526 20 * - Unroll direct copy to three copies per loop in inffast.c
jonathonfletcher 0:54f5be781526 21 *
jonathonfletcher 0:54f5be781526 22 * 1.2.beta2 4 Dec 2002
jonathonfletcher 0:54f5be781526 23 * - Change external routine names to reduce potential conflicts
jonathonfletcher 0:54f5be781526 24 * - Correct filename to inffixed.h for fixed tables in inflate.c
jonathonfletcher 0:54f5be781526 25 * - Make hbuf[] unsigned char to match parameter type in inflate.c
jonathonfletcher 0:54f5be781526 26 * - Change strm->next_out[-state->offset] to *(strm->next_out - state->offset)
jonathonfletcher 0:54f5be781526 27 * to avoid negation problem on Alphas (64 bit) in inflate.c
jonathonfletcher 0:54f5be781526 28 *
jonathonfletcher 0:54f5be781526 29 * 1.2.beta3 22 Dec 2002
jonathonfletcher 0:54f5be781526 30 * - Add comments on state->bits assertion in inffast.c
jonathonfletcher 0:54f5be781526 31 * - Add comments on op field in inftrees.h
jonathonfletcher 0:54f5be781526 32 * - Fix bug in reuse of allocated window after inflateReset()
jonathonfletcher 0:54f5be781526 33 * - Remove bit fields--back to byte structure for speed
jonathonfletcher 0:54f5be781526 34 * - Remove distance extra == 0 check in inflate_fast()--only helps for lengths
jonathonfletcher 0:54f5be781526 35 * - Change post-increments to pre-increments in inflate_fast(), PPC biased?
jonathonfletcher 0:54f5be781526 36 * - Add compile time option, POSTINC, to use post-increments instead (Intel?)
jonathonfletcher 0:54f5be781526 37 * - Make MATCH copy in inflate() much faster for when inflate_fast() not used
jonathonfletcher 0:54f5be781526 38 * - Use local copies of stream next and avail values, as well as local bit
jonathonfletcher 0:54f5be781526 39 * buffer and bit count in inflate()--for speed when inflate_fast() not used
jonathonfletcher 0:54f5be781526 40 *
jonathonfletcher 0:54f5be781526 41 * 1.2.beta4 1 Jan 2003
jonathonfletcher 0:54f5be781526 42 * - Split ptr - 257 statements in inflate_table() to avoid compiler warnings
jonathonfletcher 0:54f5be781526 43 * - Move a comment on output buffer sizes from inffast.c to inflate.c
jonathonfletcher 0:54f5be781526 44 * - Add comments in inffast.c to introduce the inflate_fast() routine
jonathonfletcher 0:54f5be781526 45 * - Rearrange window copies in inflate_fast() for speed and simplification
jonathonfletcher 0:54f5be781526 46 * - Unroll last copy for window match in inflate_fast()
jonathonfletcher 0:54f5be781526 47 * - Use local copies of window variables in inflate_fast() for speed
jonathonfletcher 0:54f5be781526 48 * - Pull out common wnext == 0 case for speed in inflate_fast()
jonathonfletcher 0:54f5be781526 49 * - Make op and len in inflate_fast() unsigned for consistency
jonathonfletcher 0:54f5be781526 50 * - Add FAR to lcode and dcode declarations in inflate_fast()
jonathonfletcher 0:54f5be781526 51 * - Simplified bad distance check in inflate_fast()
jonathonfletcher 0:54f5be781526 52 * - Added inflateBackInit(), inflateBack(), and inflateBackEnd() in new
jonathonfletcher 0:54f5be781526 53 * source file infback.c to provide a call-back interface to inflate for
jonathonfletcher 0:54f5be781526 54 * programs like gzip and unzip -- uses window as output buffer to avoid
jonathonfletcher 0:54f5be781526 55 * window copying
jonathonfletcher 0:54f5be781526 56 *
jonathonfletcher 0:54f5be781526 57 * 1.2.beta5 1 Jan 2003
jonathonfletcher 0:54f5be781526 58 * - Improved inflateBack() interface to allow the caller to provide initial
jonathonfletcher 0:54f5be781526 59 * input in strm.
jonathonfletcher 0:54f5be781526 60 * - Fixed stored blocks bug in inflateBack()
jonathonfletcher 0:54f5be781526 61 *
jonathonfletcher 0:54f5be781526 62 * 1.2.beta6 4 Jan 2003
jonathonfletcher 0:54f5be781526 63 * - Added comments in inffast.c on effectiveness of POSTINC
jonathonfletcher 0:54f5be781526 64 * - Typecasting all around to reduce compiler warnings
jonathonfletcher 0:54f5be781526 65 * - Changed loops from while (1) or do {} while (1) to for (;;), again to
jonathonfletcher 0:54f5be781526 66 * make compilers happy
jonathonfletcher 0:54f5be781526 67 * - Changed type of window in inflateBackInit() to unsigned char *
jonathonfletcher 0:54f5be781526 68 *
jonathonfletcher 0:54f5be781526 69 * 1.2.beta7 27 Jan 2003
jonathonfletcher 0:54f5be781526 70 * - Changed many types to unsigned or unsigned short to avoid warnings
jonathonfletcher 0:54f5be781526 71 * - Added inflateCopy() function
jonathonfletcher 0:54f5be781526 72 *
jonathonfletcher 0:54f5be781526 73 * 1.2.0 9 Mar 2003
jonathonfletcher 0:54f5be781526 74 * - Changed inflateBack() interface to provide separate opaque descriptors
jonathonfletcher 0:54f5be781526 75 * for the in() and out() functions
jonathonfletcher 0:54f5be781526 76 * - Changed inflateBack() argument and in_func typedef to swap the length
jonathonfletcher 0:54f5be781526 77 * and buffer address return values for the input function
jonathonfletcher 0:54f5be781526 78 * - Check next_in and next_out for Z_NULL on entry to inflate()
jonathonfletcher 0:54f5be781526 79 *
jonathonfletcher 0:54f5be781526 80 * The history for versions after 1.2.0 are in ChangeLog in zlib distribution.
jonathonfletcher 0:54f5be781526 81 */
jonathonfletcher 0:54f5be781526 82
jonathonfletcher 0:54f5be781526 83 #include "zutil.h"
jonathonfletcher 0:54f5be781526 84 #include "inftrees.h"
jonathonfletcher 0:54f5be781526 85 #include "inflate.h"
jonathonfletcher 0:54f5be781526 86 #include "inffast.h"
jonathonfletcher 0:54f5be781526 87
jonathonfletcher 0:54f5be781526 88 #ifdef MAKEFIXED
jonathonfletcher 0:54f5be781526 89 # ifndef BUILDFIXED
jonathonfletcher 0:54f5be781526 90 # define BUILDFIXED
jonathonfletcher 0:54f5be781526 91 # endif
jonathonfletcher 0:54f5be781526 92 #endif
jonathonfletcher 0:54f5be781526 93
jonathonfletcher 0:54f5be781526 94 /* function prototypes */
jonathonfletcher 0:54f5be781526 95 local void fixedtables OF((struct inflate_state FAR *state));
jonathonfletcher 0:54f5be781526 96 local int updatewindow OF((z_streamp strm, unsigned out));
jonathonfletcher 0:54f5be781526 97 #ifdef BUILDFIXED
jonathonfletcher 0:54f5be781526 98 void makefixed OF((void));
jonathonfletcher 0:54f5be781526 99 #endif
jonathonfletcher 0:54f5be781526 100 local unsigned syncsearch OF((unsigned FAR *have, unsigned char FAR *buf,
jonathonfletcher 0:54f5be781526 101 unsigned len));
jonathonfletcher 0:54f5be781526 102
jonathonfletcher 0:54f5be781526 103 int ZEXPORT inflateResetKeep(strm)
jonathonfletcher 0:54f5be781526 104 z_streamp strm;
jonathonfletcher 0:54f5be781526 105 {
jonathonfletcher 0:54f5be781526 106 struct inflate_state FAR *state;
jonathonfletcher 0:54f5be781526 107
jonathonfletcher 0:54f5be781526 108 if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR;
jonathonfletcher 0:54f5be781526 109 state = (struct inflate_state FAR *)strm->state;
jonathonfletcher 0:54f5be781526 110 strm->total_in = strm->total_out = state->total = 0;
jonathonfletcher 0:54f5be781526 111 strm->msg = Z_NULL;
jonathonfletcher 0:54f5be781526 112 if (state->wrap) /* to support ill-conceived Java test suite */
jonathonfletcher 0:54f5be781526 113 strm->adler = state->wrap & 1;
jonathonfletcher 0:54f5be781526 114 state->mode = HEAD;
jonathonfletcher 0:54f5be781526 115 state->last = 0;
jonathonfletcher 0:54f5be781526 116 state->havedict = 0;
jonathonfletcher 0:54f5be781526 117 state->dmax = 32768U;
jonathonfletcher 0:54f5be781526 118 state->head = Z_NULL;
jonathonfletcher 0:54f5be781526 119 state->hold = 0;
jonathonfletcher 0:54f5be781526 120 state->bits = 0;
jonathonfletcher 0:54f5be781526 121 state->lencode = state->distcode = state->next = state->codes;
jonathonfletcher 0:54f5be781526 122 state->sane = 1;
jonathonfletcher 0:54f5be781526 123 state->back = -1;
jonathonfletcher 0:54f5be781526 124 Tracev((stderr, "inflate: reset\n"));
jonathonfletcher 0:54f5be781526 125 return Z_OK;
jonathonfletcher 0:54f5be781526 126 }
jonathonfletcher 0:54f5be781526 127
jonathonfletcher 0:54f5be781526 128 int ZEXPORT inflateReset(strm)
jonathonfletcher 0:54f5be781526 129 z_streamp strm;
jonathonfletcher 0:54f5be781526 130 {
jonathonfletcher 0:54f5be781526 131 struct inflate_state FAR *state;
jonathonfletcher 0:54f5be781526 132
jonathonfletcher 0:54f5be781526 133 if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR;
jonathonfletcher 0:54f5be781526 134 state = (struct inflate_state FAR *)strm->state;
jonathonfletcher 0:54f5be781526 135 state->wsize = 0;
jonathonfletcher 0:54f5be781526 136 state->whave = 0;
jonathonfletcher 0:54f5be781526 137 state->wnext = 0;
jonathonfletcher 0:54f5be781526 138 return inflateResetKeep(strm);
jonathonfletcher 0:54f5be781526 139 }
jonathonfletcher 0:54f5be781526 140
jonathonfletcher 0:54f5be781526 141 int ZEXPORT inflateReset2(strm, windowBits)
jonathonfletcher 0:54f5be781526 142 z_streamp strm;
jonathonfletcher 0:54f5be781526 143 int windowBits;
jonathonfletcher 0:54f5be781526 144 {
jonathonfletcher 0:54f5be781526 145 int wrap;
jonathonfletcher 0:54f5be781526 146 struct inflate_state FAR *state;
jonathonfletcher 0:54f5be781526 147
jonathonfletcher 0:54f5be781526 148 /* get the state */
jonathonfletcher 0:54f5be781526 149 if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR;
jonathonfletcher 0:54f5be781526 150 state = (struct inflate_state FAR *)strm->state;
jonathonfletcher 0:54f5be781526 151
jonathonfletcher 0:54f5be781526 152 /* extract wrap request from windowBits parameter */
jonathonfletcher 0:54f5be781526 153 if (windowBits < 0) {
jonathonfletcher 0:54f5be781526 154 wrap = 0;
jonathonfletcher 0:54f5be781526 155 windowBits = -windowBits;
jonathonfletcher 0:54f5be781526 156 }
jonathonfletcher 0:54f5be781526 157 else {
jonathonfletcher 0:54f5be781526 158 wrap = (windowBits >> 4) + 1;
jonathonfletcher 0:54f5be781526 159 #ifdef GUNZIP
jonathonfletcher 0:54f5be781526 160 if (windowBits < 48)
jonathonfletcher 0:54f5be781526 161 windowBits &= 15;
jonathonfletcher 0:54f5be781526 162 #endif
jonathonfletcher 0:54f5be781526 163 }
jonathonfletcher 0:54f5be781526 164
jonathonfletcher 0:54f5be781526 165 /* set number of window bits, free window if different */
jonathonfletcher 0:54f5be781526 166 if (windowBits && (windowBits < 8 || windowBits > 15))
jonathonfletcher 0:54f5be781526 167 return Z_STREAM_ERROR;
jonathonfletcher 0:54f5be781526 168 if (state->window != Z_NULL && state->wbits != (unsigned)windowBits) {
jonathonfletcher 0:54f5be781526 169 ZFREE(strm, state->window);
jonathonfletcher 0:54f5be781526 170 state->window = Z_NULL;
jonathonfletcher 0:54f5be781526 171 }
jonathonfletcher 0:54f5be781526 172
jonathonfletcher 0:54f5be781526 173 /* update state and reset the rest of it */
jonathonfletcher 0:54f5be781526 174 state->wrap = wrap;
jonathonfletcher 0:54f5be781526 175 state->wbits = (unsigned)windowBits;
jonathonfletcher 0:54f5be781526 176 return inflateReset(strm);
jonathonfletcher 0:54f5be781526 177 }
jonathonfletcher 0:54f5be781526 178
jonathonfletcher 0:54f5be781526 179 int ZEXPORT inflateInit2_(strm, windowBits, version, stream_size)
jonathonfletcher 0:54f5be781526 180 z_streamp strm;
jonathonfletcher 0:54f5be781526 181 int windowBits;
jonathonfletcher 0:54f5be781526 182 const char *version;
jonathonfletcher 0:54f5be781526 183 int stream_size;
jonathonfletcher 0:54f5be781526 184 {
jonathonfletcher 0:54f5be781526 185 int ret;
jonathonfletcher 0:54f5be781526 186 struct inflate_state FAR *state;
jonathonfletcher 0:54f5be781526 187
jonathonfletcher 0:54f5be781526 188 if (version == Z_NULL || version[0] != ZLIB_VERSION[0] ||
jonathonfletcher 0:54f5be781526 189 stream_size != (int)(sizeof(z_stream)))
jonathonfletcher 0:54f5be781526 190 return Z_VERSION_ERROR;
jonathonfletcher 0:54f5be781526 191 if (strm == Z_NULL) return Z_STREAM_ERROR;
jonathonfletcher 0:54f5be781526 192 strm->msg = Z_NULL; /* in case we return an error */
jonathonfletcher 0:54f5be781526 193 if (strm->zalloc == (alloc_func)0) {
jonathonfletcher 0:54f5be781526 194 #ifdef Z_SOLO
jonathonfletcher 0:54f5be781526 195 return Z_STREAM_ERROR;
jonathonfletcher 0:54f5be781526 196 #else
jonathonfletcher 0:54f5be781526 197 strm->zalloc = zcalloc;
jonathonfletcher 0:54f5be781526 198 strm->opaque = (voidpf)0;
jonathonfletcher 0:54f5be781526 199 #endif
jonathonfletcher 0:54f5be781526 200 }
jonathonfletcher 0:54f5be781526 201 if (strm->zfree == (free_func)0)
jonathonfletcher 0:54f5be781526 202 #ifdef Z_SOLO
jonathonfletcher 0:54f5be781526 203 return Z_STREAM_ERROR;
jonathonfletcher 0:54f5be781526 204 #else
jonathonfletcher 0:54f5be781526 205 strm->zfree = zcfree;
jonathonfletcher 0:54f5be781526 206 #endif
jonathonfletcher 0:54f5be781526 207 state = (struct inflate_state FAR *)
jonathonfletcher 0:54f5be781526 208 ZALLOC(strm, 1, sizeof(struct inflate_state));
jonathonfletcher 0:54f5be781526 209 if (state == Z_NULL) return Z_MEM_ERROR;
jonathonfletcher 0:54f5be781526 210 Tracev((stderr, "inflate: allocated\n"));
jonathonfletcher 0:54f5be781526 211 strm->state = (struct internal_state FAR *)state;
jonathonfletcher 0:54f5be781526 212 state->window = Z_NULL;
jonathonfletcher 0:54f5be781526 213 ret = inflateReset2(strm, windowBits);
jonathonfletcher 0:54f5be781526 214 if (ret != Z_OK) {
jonathonfletcher 0:54f5be781526 215 ZFREE(strm, state);
jonathonfletcher 0:54f5be781526 216 strm->state = Z_NULL;
jonathonfletcher 0:54f5be781526 217 }
jonathonfletcher 0:54f5be781526 218 return ret;
jonathonfletcher 0:54f5be781526 219 }
jonathonfletcher 0:54f5be781526 220
jonathonfletcher 0:54f5be781526 221 int ZEXPORT inflateInit_(strm, version, stream_size)
jonathonfletcher 0:54f5be781526 222 z_streamp strm;
jonathonfletcher 0:54f5be781526 223 const char *version;
jonathonfletcher 0:54f5be781526 224 int stream_size;
jonathonfletcher 0:54f5be781526 225 {
jonathonfletcher 0:54f5be781526 226 return inflateInit2_(strm, DEF_WBITS, version, stream_size);
jonathonfletcher 0:54f5be781526 227 }
jonathonfletcher 0:54f5be781526 228
jonathonfletcher 0:54f5be781526 229 int ZEXPORT inflatePrime(strm, bits, value)
jonathonfletcher 0:54f5be781526 230 z_streamp strm;
jonathonfletcher 0:54f5be781526 231 int bits;
jonathonfletcher 0:54f5be781526 232 int value;
jonathonfletcher 0:54f5be781526 233 {
jonathonfletcher 0:54f5be781526 234 struct inflate_state FAR *state;
jonathonfletcher 0:54f5be781526 235
jonathonfletcher 0:54f5be781526 236 if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR;
jonathonfletcher 0:54f5be781526 237 state = (struct inflate_state FAR *)strm->state;
jonathonfletcher 0:54f5be781526 238 if (bits < 0) {
jonathonfletcher 0:54f5be781526 239 state->hold = 0;
jonathonfletcher 0:54f5be781526 240 state->bits = 0;
jonathonfletcher 0:54f5be781526 241 return Z_OK;
jonathonfletcher 0:54f5be781526 242 }
jonathonfletcher 0:54f5be781526 243 if (bits > 16 || state->bits + bits > 32) return Z_STREAM_ERROR;
jonathonfletcher 0:54f5be781526 244 value &= (1L << bits) - 1;
jonathonfletcher 0:54f5be781526 245 state->hold += value << state->bits;
jonathonfletcher 0:54f5be781526 246 state->bits += bits;
jonathonfletcher 0:54f5be781526 247 return Z_OK;
jonathonfletcher 0:54f5be781526 248 }
jonathonfletcher 0:54f5be781526 249
jonathonfletcher 0:54f5be781526 250 /*
jonathonfletcher 0:54f5be781526 251 Return state with length and distance decoding tables and index sizes set to
jonathonfletcher 0:54f5be781526 252 fixed code decoding. Normally this returns fixed tables from inffixed.h.
jonathonfletcher 0:54f5be781526 253 If BUILDFIXED is defined, then instead this routine builds the tables the
jonathonfletcher 0:54f5be781526 254 first time it's called, and returns those tables the first time and
jonathonfletcher 0:54f5be781526 255 thereafter. This reduces the size of the code by about 2K bytes, in
jonathonfletcher 0:54f5be781526 256 exchange for a little execution time. However, BUILDFIXED should not be
jonathonfletcher 0:54f5be781526 257 used for threaded applications, since the rewriting of the tables and virgin
jonathonfletcher 0:54f5be781526 258 may not be thread-safe.
jonathonfletcher 0:54f5be781526 259 */
jonathonfletcher 0:54f5be781526 260 local void fixedtables(state)
jonathonfletcher 0:54f5be781526 261 struct inflate_state FAR *state;
jonathonfletcher 0:54f5be781526 262 {
jonathonfletcher 0:54f5be781526 263 #ifdef BUILDFIXED
jonathonfletcher 0:54f5be781526 264 static int virgin = 1;
jonathonfletcher 0:54f5be781526 265 static code *lenfix, *distfix;
jonathonfletcher 0:54f5be781526 266 static code fixed[544];
jonathonfletcher 0:54f5be781526 267
jonathonfletcher 0:54f5be781526 268 /* build fixed huffman tables if first call (may not be thread safe) */
jonathonfletcher 0:54f5be781526 269 if (virgin) {
jonathonfletcher 0:54f5be781526 270 unsigned sym, bits;
jonathonfletcher 0:54f5be781526 271 static code *next;
jonathonfletcher 0:54f5be781526 272
jonathonfletcher 0:54f5be781526 273 /* literal/length table */
jonathonfletcher 0:54f5be781526 274 sym = 0;
jonathonfletcher 0:54f5be781526 275 while (sym < 144) state->lens[sym++] = 8;
jonathonfletcher 0:54f5be781526 276 while (sym < 256) state->lens[sym++] = 9;
jonathonfletcher 0:54f5be781526 277 while (sym < 280) state->lens[sym++] = 7;
jonathonfletcher 0:54f5be781526 278 while (sym < 288) state->lens[sym++] = 8;
jonathonfletcher 0:54f5be781526 279 next = fixed;
jonathonfletcher 0:54f5be781526 280 lenfix = next;
jonathonfletcher 0:54f5be781526 281 bits = 9;
jonathonfletcher 0:54f5be781526 282 inflate_table(LENS, state->lens, 288, &(next), &(bits), state->work);
jonathonfletcher 0:54f5be781526 283
jonathonfletcher 0:54f5be781526 284 /* distance table */
jonathonfletcher 0:54f5be781526 285 sym = 0;
jonathonfletcher 0:54f5be781526 286 while (sym < 32) state->lens[sym++] = 5;
jonathonfletcher 0:54f5be781526 287 distfix = next;
jonathonfletcher 0:54f5be781526 288 bits = 5;
jonathonfletcher 0:54f5be781526 289 inflate_table(DISTS, state->lens, 32, &(next), &(bits), state->work);
jonathonfletcher 0:54f5be781526 290
jonathonfletcher 0:54f5be781526 291 /* do this just once */
jonathonfletcher 0:54f5be781526 292 virgin = 0;
jonathonfletcher 0:54f5be781526 293 }
jonathonfletcher 0:54f5be781526 294 #else /* !BUILDFIXED */
jonathonfletcher 0:54f5be781526 295 # include "inffixed.h"
jonathonfletcher 0:54f5be781526 296 #endif /* BUILDFIXED */
jonathonfletcher 0:54f5be781526 297 state->lencode = lenfix;
jonathonfletcher 0:54f5be781526 298 state->lenbits = 9;
jonathonfletcher 0:54f5be781526 299 state->distcode = distfix;
jonathonfletcher 0:54f5be781526 300 state->distbits = 5;
jonathonfletcher 0:54f5be781526 301 }
jonathonfletcher 0:54f5be781526 302
jonathonfletcher 0:54f5be781526 303 #ifdef MAKEFIXED
jonathonfletcher 0:54f5be781526 304 #include <stdio.h>
jonathonfletcher 0:54f5be781526 305
jonathonfletcher 0:54f5be781526 306 /*
jonathonfletcher 0:54f5be781526 307 Write out the inffixed.h that is #include'd above. Defining MAKEFIXED also
jonathonfletcher 0:54f5be781526 308 defines BUILDFIXED, so the tables are built on the fly. makefixed() writes
jonathonfletcher 0:54f5be781526 309 those tables to stdout, which would be piped to inffixed.h. A small program
jonathonfletcher 0:54f5be781526 310 can simply call makefixed to do this:
jonathonfletcher 0:54f5be781526 311
jonathonfletcher 0:54f5be781526 312 void makefixed(void);
jonathonfletcher 0:54f5be781526 313
jonathonfletcher 0:54f5be781526 314 int main(void)
jonathonfletcher 0:54f5be781526 315 {
jonathonfletcher 0:54f5be781526 316 makefixed();
jonathonfletcher 0:54f5be781526 317 return 0;
jonathonfletcher 0:54f5be781526 318 }
jonathonfletcher 0:54f5be781526 319
jonathonfletcher 0:54f5be781526 320 Then that can be linked with zlib built with MAKEFIXED defined and run:
jonathonfletcher 0:54f5be781526 321
jonathonfletcher 0:54f5be781526 322 a.out > inffixed.h
jonathonfletcher 0:54f5be781526 323 */
jonathonfletcher 0:54f5be781526 324 void makefixed()
jonathonfletcher 0:54f5be781526 325 {
jonathonfletcher 0:54f5be781526 326 unsigned low, size;
jonathonfletcher 0:54f5be781526 327 struct inflate_state state;
jonathonfletcher 0:54f5be781526 328
jonathonfletcher 0:54f5be781526 329 fixedtables(&state);
jonathonfletcher 0:54f5be781526 330 puts(" /* inffixed.h -- table for decoding fixed codes");
jonathonfletcher 0:54f5be781526 331 puts(" * Generated automatically by makefixed().");
jonathonfletcher 0:54f5be781526 332 puts(" */");
jonathonfletcher 0:54f5be781526 333 puts("");
jonathonfletcher 0:54f5be781526 334 puts(" /* WARNING: this file should *not* be used by applications.");
jonathonfletcher 0:54f5be781526 335 puts(" It is part of the implementation of this library and is");
jonathonfletcher 0:54f5be781526 336 puts(" subject to change. Applications should only use zlib.h.");
jonathonfletcher 0:54f5be781526 337 puts(" */");
jonathonfletcher 0:54f5be781526 338 puts("");
jonathonfletcher 0:54f5be781526 339 size = 1U << 9;
jonathonfletcher 0:54f5be781526 340 printf(" static const code lenfix[%u] = {", size);
jonathonfletcher 0:54f5be781526 341 low = 0;
jonathonfletcher 0:54f5be781526 342 for (;;) {
jonathonfletcher 0:54f5be781526 343 if ((low % 7) == 0) printf("\n ");
jonathonfletcher 0:54f5be781526 344 printf("{%u,%u,%d}", (low & 127) == 99 ? 64 : state.lencode[low].op,
jonathonfletcher 0:54f5be781526 345 state.lencode[low].bits, state.lencode[low].val);
jonathonfletcher 0:54f5be781526 346 if (++low == size) break;
jonathonfletcher 0:54f5be781526 347 putchar(',');
jonathonfletcher 0:54f5be781526 348 }
jonathonfletcher 0:54f5be781526 349 puts("\n };");
jonathonfletcher 0:54f5be781526 350 size = 1U << 5;
jonathonfletcher 0:54f5be781526 351 printf("\n static const code distfix[%u] = {", size);
jonathonfletcher 0:54f5be781526 352 low = 0;
jonathonfletcher 0:54f5be781526 353 for (;;) {
jonathonfletcher 0:54f5be781526 354 if ((low % 6) == 0) printf("\n ");
jonathonfletcher 0:54f5be781526 355 printf("{%u,%u,%d}", state.distcode[low].op, state.distcode[low].bits,
jonathonfletcher 0:54f5be781526 356 state.distcode[low].val);
jonathonfletcher 0:54f5be781526 357 if (++low == size) break;
jonathonfletcher 0:54f5be781526 358 putchar(',');
jonathonfletcher 0:54f5be781526 359 }
jonathonfletcher 0:54f5be781526 360 puts("\n };");
jonathonfletcher 0:54f5be781526 361 }
jonathonfletcher 0:54f5be781526 362 #endif /* MAKEFIXED */
jonathonfletcher 0:54f5be781526 363
jonathonfletcher 0:54f5be781526 364 /*
jonathonfletcher 0:54f5be781526 365 Update the window with the last wsize (normally 32K) bytes written before
jonathonfletcher 0:54f5be781526 366 returning. If window does not exist yet, create it. This is only called
jonathonfletcher 0:54f5be781526 367 when a window is already in use, or when output has been written during this
jonathonfletcher 0:54f5be781526 368 inflate call, but the end of the deflate stream has not been reached yet.
jonathonfletcher 0:54f5be781526 369 It is also called to create a window for dictionary data when a dictionary
jonathonfletcher 0:54f5be781526 370 is loaded.
jonathonfletcher 0:54f5be781526 371
jonathonfletcher 0:54f5be781526 372 Providing output buffers larger than 32K to inflate() should provide a speed
jonathonfletcher 0:54f5be781526 373 advantage, since only the last 32K of output is copied to the sliding window
jonathonfletcher 0:54f5be781526 374 upon return from inflate(), and since all distances after the first 32K of
jonathonfletcher 0:54f5be781526 375 output will fall in the output data, making match copies simpler and faster.
jonathonfletcher 0:54f5be781526 376 The advantage may be dependent on the size of the processor's data caches.
jonathonfletcher 0:54f5be781526 377 */
jonathonfletcher 0:54f5be781526 378 local int updatewindow(strm, out)
jonathonfletcher 0:54f5be781526 379 z_streamp strm;
jonathonfletcher 0:54f5be781526 380 unsigned out;
jonathonfletcher 0:54f5be781526 381 {
jonathonfletcher 0:54f5be781526 382 struct inflate_state FAR *state;
jonathonfletcher 0:54f5be781526 383 unsigned copy, dist;
jonathonfletcher 0:54f5be781526 384
jonathonfletcher 0:54f5be781526 385 state = (struct inflate_state FAR *)strm->state;
jonathonfletcher 0:54f5be781526 386
jonathonfletcher 0:54f5be781526 387 /* if it hasn't been done already, allocate space for the window */
jonathonfletcher 0:54f5be781526 388 if (state->window == Z_NULL) {
jonathonfletcher 0:54f5be781526 389 state->window = (unsigned char FAR *)
jonathonfletcher 0:54f5be781526 390 ZALLOC(strm, 1U << state->wbits,
jonathonfletcher 0:54f5be781526 391 sizeof(unsigned char));
jonathonfletcher 0:54f5be781526 392 if (state->window == Z_NULL) return 1;
jonathonfletcher 0:54f5be781526 393 }
jonathonfletcher 0:54f5be781526 394
jonathonfletcher 0:54f5be781526 395 /* if window not in use yet, initialize */
jonathonfletcher 0:54f5be781526 396 if (state->wsize == 0) {
jonathonfletcher 0:54f5be781526 397 state->wsize = 1U << state->wbits;
jonathonfletcher 0:54f5be781526 398 state->wnext = 0;
jonathonfletcher 0:54f5be781526 399 state->whave = 0;
jonathonfletcher 0:54f5be781526 400 }
jonathonfletcher 0:54f5be781526 401
jonathonfletcher 0:54f5be781526 402 /* copy state->wsize or less output bytes into the circular window */
jonathonfletcher 0:54f5be781526 403 copy = out - strm->avail_out;
jonathonfletcher 0:54f5be781526 404 if (copy >= state->wsize) {
jonathonfletcher 0:54f5be781526 405 zmemcpy(state->window, strm->next_out - state->wsize, state->wsize);
jonathonfletcher 0:54f5be781526 406 state->wnext = 0;
jonathonfletcher 0:54f5be781526 407 state->whave = state->wsize;
jonathonfletcher 0:54f5be781526 408 }
jonathonfletcher 0:54f5be781526 409 else {
jonathonfletcher 0:54f5be781526 410 dist = state->wsize - state->wnext;
jonathonfletcher 0:54f5be781526 411 if (dist > copy) dist = copy;
jonathonfletcher 0:54f5be781526 412 zmemcpy(state->window + state->wnext, strm->next_out - copy, dist);
jonathonfletcher 0:54f5be781526 413 copy -= dist;
jonathonfletcher 0:54f5be781526 414 if (copy) {
jonathonfletcher 0:54f5be781526 415 zmemcpy(state->window, strm->next_out - copy, copy);
jonathonfletcher 0:54f5be781526 416 state->wnext = copy;
jonathonfletcher 0:54f5be781526 417 state->whave = state->wsize;
jonathonfletcher 0:54f5be781526 418 }
jonathonfletcher 0:54f5be781526 419 else {
jonathonfletcher 0:54f5be781526 420 state->wnext += dist;
jonathonfletcher 0:54f5be781526 421 if (state->wnext == state->wsize) state->wnext = 0;
jonathonfletcher 0:54f5be781526 422 if (state->whave < state->wsize) state->whave += dist;
jonathonfletcher 0:54f5be781526 423 }
jonathonfletcher 0:54f5be781526 424 }
jonathonfletcher 0:54f5be781526 425 return 0;
jonathonfletcher 0:54f5be781526 426 }
jonathonfletcher 0:54f5be781526 427
jonathonfletcher 0:54f5be781526 428 /* Macros for inflate(): */
jonathonfletcher 0:54f5be781526 429
jonathonfletcher 0:54f5be781526 430 /* check function to use adler32() for zlib or crc32() for gzip */
jonathonfletcher 0:54f5be781526 431 #ifdef GUNZIP
jonathonfletcher 0:54f5be781526 432 # define UPDATE(check, buf, len) \
jonathonfletcher 0:54f5be781526 433 (state->flags ? crc32(check, buf, len) : adler32(check, buf, len))
jonathonfletcher 0:54f5be781526 434 #else
jonathonfletcher 0:54f5be781526 435 # define UPDATE(check, buf, len) adler32(check, buf, len)
jonathonfletcher 0:54f5be781526 436 #endif
jonathonfletcher 0:54f5be781526 437
jonathonfletcher 0:54f5be781526 438 /* check macros for header crc */
jonathonfletcher 0:54f5be781526 439 #ifdef GUNZIP
jonathonfletcher 0:54f5be781526 440 # define CRC2(check, word) \
jonathonfletcher 0:54f5be781526 441 do { \
jonathonfletcher 0:54f5be781526 442 hbuf[0] = (unsigned char)(word); \
jonathonfletcher 0:54f5be781526 443 hbuf[1] = (unsigned char)((word) >> 8); \
jonathonfletcher 0:54f5be781526 444 check = crc32(check, hbuf, 2); \
jonathonfletcher 0:54f5be781526 445 } while (0)
jonathonfletcher 0:54f5be781526 446
jonathonfletcher 0:54f5be781526 447 # define CRC4(check, word) \
jonathonfletcher 0:54f5be781526 448 do { \
jonathonfletcher 0:54f5be781526 449 hbuf[0] = (unsigned char)(word); \
jonathonfletcher 0:54f5be781526 450 hbuf[1] = (unsigned char)((word) >> 8); \
jonathonfletcher 0:54f5be781526 451 hbuf[2] = (unsigned char)((word) >> 16); \
jonathonfletcher 0:54f5be781526 452 hbuf[3] = (unsigned char)((word) >> 24); \
jonathonfletcher 0:54f5be781526 453 check = crc32(check, hbuf, 4); \
jonathonfletcher 0:54f5be781526 454 } while (0)
jonathonfletcher 0:54f5be781526 455 #endif
jonathonfletcher 0:54f5be781526 456
jonathonfletcher 0:54f5be781526 457 /* Load registers with state in inflate() for speed */
jonathonfletcher 0:54f5be781526 458 #define LOAD() \
jonathonfletcher 0:54f5be781526 459 do { \
jonathonfletcher 0:54f5be781526 460 put = strm->next_out; \
jonathonfletcher 0:54f5be781526 461 left = strm->avail_out; \
jonathonfletcher 0:54f5be781526 462 next = strm->next_in; \
jonathonfletcher 0:54f5be781526 463 have = strm->avail_in; \
jonathonfletcher 0:54f5be781526 464 hold = state->hold; \
jonathonfletcher 0:54f5be781526 465 bits = state->bits; \
jonathonfletcher 0:54f5be781526 466 } while (0)
jonathonfletcher 0:54f5be781526 467
jonathonfletcher 0:54f5be781526 468 /* Restore state from registers in inflate() */
jonathonfletcher 0:54f5be781526 469 #define RESTORE() \
jonathonfletcher 0:54f5be781526 470 do { \
jonathonfletcher 0:54f5be781526 471 strm->next_out = put; \
jonathonfletcher 0:54f5be781526 472 strm->avail_out = left; \
jonathonfletcher 0:54f5be781526 473 strm->next_in = next; \
jonathonfletcher 0:54f5be781526 474 strm->avail_in = have; \
jonathonfletcher 0:54f5be781526 475 state->hold = hold; \
jonathonfletcher 0:54f5be781526 476 state->bits = bits; \
jonathonfletcher 0:54f5be781526 477 } while (0)
jonathonfletcher 0:54f5be781526 478
jonathonfletcher 0:54f5be781526 479 /* Clear the input bit accumulator */
jonathonfletcher 0:54f5be781526 480 #define INITBITS() \
jonathonfletcher 0:54f5be781526 481 do { \
jonathonfletcher 0:54f5be781526 482 hold = 0; \
jonathonfletcher 0:54f5be781526 483 bits = 0; \
jonathonfletcher 0:54f5be781526 484 } while (0)
jonathonfletcher 0:54f5be781526 485
jonathonfletcher 0:54f5be781526 486 /* Get a byte of input into the bit accumulator, or return from inflate()
jonathonfletcher 0:54f5be781526 487 if there is no input available. */
jonathonfletcher 0:54f5be781526 488 #define PULLBYTE() \
jonathonfletcher 0:54f5be781526 489 do { \
jonathonfletcher 0:54f5be781526 490 if (have == 0) goto inf_leave; \
jonathonfletcher 0:54f5be781526 491 have--; \
jonathonfletcher 0:54f5be781526 492 hold += (unsigned long)(*next++) << bits; \
jonathonfletcher 0:54f5be781526 493 bits += 8; \
jonathonfletcher 0:54f5be781526 494 } while (0)
jonathonfletcher 0:54f5be781526 495
jonathonfletcher 0:54f5be781526 496 /* Assure that there are at least n bits in the bit accumulator. If there is
jonathonfletcher 0:54f5be781526 497 not enough available input to do that, then return from inflate(). */
jonathonfletcher 0:54f5be781526 498 #define NEEDBITS(n) \
jonathonfletcher 0:54f5be781526 499 do { \
jonathonfletcher 0:54f5be781526 500 while (bits < (unsigned)(n)) \
jonathonfletcher 0:54f5be781526 501 PULLBYTE(); \
jonathonfletcher 0:54f5be781526 502 } while (0)
jonathonfletcher 0:54f5be781526 503
jonathonfletcher 0:54f5be781526 504 /* Return the low n bits of the bit accumulator (n < 16) */
jonathonfletcher 0:54f5be781526 505 #define BITS(n) \
jonathonfletcher 0:54f5be781526 506 ((unsigned)hold & ((1U << (n)) - 1))
jonathonfletcher 0:54f5be781526 507
jonathonfletcher 0:54f5be781526 508 /* Remove n bits from the bit accumulator */
jonathonfletcher 0:54f5be781526 509 #define DROPBITS(n) \
jonathonfletcher 0:54f5be781526 510 do { \
jonathonfletcher 0:54f5be781526 511 hold >>= (n); \
jonathonfletcher 0:54f5be781526 512 bits -= (unsigned)(n); \
jonathonfletcher 0:54f5be781526 513 } while (0)
jonathonfletcher 0:54f5be781526 514
jonathonfletcher 0:54f5be781526 515 /* Remove zero to seven bits as needed to go to a byte boundary */
jonathonfletcher 0:54f5be781526 516 #define BYTEBITS() \
jonathonfletcher 0:54f5be781526 517 do { \
jonathonfletcher 0:54f5be781526 518 hold >>= bits & 7; \
jonathonfletcher 0:54f5be781526 519 bits -= bits & 7; \
jonathonfletcher 0:54f5be781526 520 } while (0)
jonathonfletcher 0:54f5be781526 521
jonathonfletcher 0:54f5be781526 522 /*
jonathonfletcher 0:54f5be781526 523 inflate() uses a state machine to process as much input data and generate as
jonathonfletcher 0:54f5be781526 524 much output data as possible before returning. The state machine is
jonathonfletcher 0:54f5be781526 525 structured roughly as follows:
jonathonfletcher 0:54f5be781526 526
jonathonfletcher 0:54f5be781526 527 for (;;) switch (state) {
jonathonfletcher 0:54f5be781526 528 ...
jonathonfletcher 0:54f5be781526 529 case STATEn:
jonathonfletcher 0:54f5be781526 530 if (not enough input data or output space to make progress)
jonathonfletcher 0:54f5be781526 531 return;
jonathonfletcher 0:54f5be781526 532 ... make progress ...
jonathonfletcher 0:54f5be781526 533 state = STATEm;
jonathonfletcher 0:54f5be781526 534 break;
jonathonfletcher 0:54f5be781526 535 ...
jonathonfletcher 0:54f5be781526 536 }
jonathonfletcher 0:54f5be781526 537
jonathonfletcher 0:54f5be781526 538 so when inflate() is called again, the same case is attempted again, and
jonathonfletcher 0:54f5be781526 539 if the appropriate resources are provided, the machine proceeds to the
jonathonfletcher 0:54f5be781526 540 next state. The NEEDBITS() macro is usually the way the state evaluates
jonathonfletcher 0:54f5be781526 541 whether it can proceed or should return. NEEDBITS() does the return if
jonathonfletcher 0:54f5be781526 542 the requested bits are not available. The typical use of the BITS macros
jonathonfletcher 0:54f5be781526 543 is:
jonathonfletcher 0:54f5be781526 544
jonathonfletcher 0:54f5be781526 545 NEEDBITS(n);
jonathonfletcher 0:54f5be781526 546 ... do something with BITS(n) ...
jonathonfletcher 0:54f5be781526 547 DROPBITS(n);
jonathonfletcher 0:54f5be781526 548
jonathonfletcher 0:54f5be781526 549 where NEEDBITS(n) either returns from inflate() if there isn't enough
jonathonfletcher 0:54f5be781526 550 input left to load n bits into the accumulator, or it continues. BITS(n)
jonathonfletcher 0:54f5be781526 551 gives the low n bits in the accumulator. When done, DROPBITS(n) drops
jonathonfletcher 0:54f5be781526 552 the low n bits off the accumulator. INITBITS() clears the accumulator
jonathonfletcher 0:54f5be781526 553 and sets the number of available bits to zero. BYTEBITS() discards just
jonathonfletcher 0:54f5be781526 554 enough bits to put the accumulator on a byte boundary. After BYTEBITS()
jonathonfletcher 0:54f5be781526 555 and a NEEDBITS(8), then BITS(8) would return the next byte in the stream.
jonathonfletcher 0:54f5be781526 556
jonathonfletcher 0:54f5be781526 557 NEEDBITS(n) uses PULLBYTE() to get an available byte of input, or to return
jonathonfletcher 0:54f5be781526 558 if there is no input available. The decoding of variable length codes uses
jonathonfletcher 0:54f5be781526 559 PULLBYTE() directly in order to pull just enough bytes to decode the next
jonathonfletcher 0:54f5be781526 560 code, and no more.
jonathonfletcher 0:54f5be781526 561
jonathonfletcher 0:54f5be781526 562 Some states loop until they get enough input, making sure that enough
jonathonfletcher 0:54f5be781526 563 state information is maintained to continue the loop where it left off
jonathonfletcher 0:54f5be781526 564 if NEEDBITS() returns in the loop. For example, want, need, and keep
jonathonfletcher 0:54f5be781526 565 would all have to actually be part of the saved state in case NEEDBITS()
jonathonfletcher 0:54f5be781526 566 returns:
jonathonfletcher 0:54f5be781526 567
jonathonfletcher 0:54f5be781526 568 case STATEw:
jonathonfletcher 0:54f5be781526 569 while (want < need) {
jonathonfletcher 0:54f5be781526 570 NEEDBITS(n);
jonathonfletcher 0:54f5be781526 571 keep[want++] = BITS(n);
jonathonfletcher 0:54f5be781526 572 DROPBITS(n);
jonathonfletcher 0:54f5be781526 573 }
jonathonfletcher 0:54f5be781526 574 state = STATEx;
jonathonfletcher 0:54f5be781526 575 case STATEx:
jonathonfletcher 0:54f5be781526 576
jonathonfletcher 0:54f5be781526 577 As shown above, if the next state is also the next case, then the break
jonathonfletcher 0:54f5be781526 578 is omitted.
jonathonfletcher 0:54f5be781526 579
jonathonfletcher 0:54f5be781526 580 A state may also return if there is not enough output space available to
jonathonfletcher 0:54f5be781526 581 complete that state. Those states are copying stored data, writing a
jonathonfletcher 0:54f5be781526 582 literal byte, and copying a matching string.
jonathonfletcher 0:54f5be781526 583
jonathonfletcher 0:54f5be781526 584 When returning, a "goto inf_leave" is used to update the total counters,
jonathonfletcher 0:54f5be781526 585 update the check value, and determine whether any progress has been made
jonathonfletcher 0:54f5be781526 586 during that inflate() call in order to return the proper return code.
jonathonfletcher 0:54f5be781526 587 Progress is defined as a change in either strm->avail_in or strm->avail_out.
jonathonfletcher 0:54f5be781526 588 When there is a window, goto inf_leave will update the window with the last
jonathonfletcher 0:54f5be781526 589 output written. If a goto inf_leave occurs in the middle of decompression
jonathonfletcher 0:54f5be781526 590 and there is no window currently, goto inf_leave will create one and copy
jonathonfletcher 0:54f5be781526 591 output to the window for the next call of inflate().
jonathonfletcher 0:54f5be781526 592
jonathonfletcher 0:54f5be781526 593 In this implementation, the flush parameter of inflate() only affects the
jonathonfletcher 0:54f5be781526 594 return code (per zlib.h). inflate() always writes as much as possible to
jonathonfletcher 0:54f5be781526 595 strm->next_out, given the space available and the provided input--the effect
jonathonfletcher 0:54f5be781526 596 documented in zlib.h of Z_SYNC_FLUSH. Furthermore, inflate() always defers
jonathonfletcher 0:54f5be781526 597 the allocation of and copying into a sliding window until necessary, which
jonathonfletcher 0:54f5be781526 598 provides the effect documented in zlib.h for Z_FINISH when the entire input
jonathonfletcher 0:54f5be781526 599 stream available. So the only thing the flush parameter actually does is:
jonathonfletcher 0:54f5be781526 600 when flush is set to Z_FINISH, inflate() cannot return Z_OK. Instead it
jonathonfletcher 0:54f5be781526 601 will return Z_BUF_ERROR if it has not reached the end of the stream.
jonathonfletcher 0:54f5be781526 602 */
jonathonfletcher 0:54f5be781526 603
jonathonfletcher 0:54f5be781526 604 int ZEXPORT inflate(strm, flush)
jonathonfletcher 0:54f5be781526 605 z_streamp strm;
jonathonfletcher 0:54f5be781526 606 int flush;
jonathonfletcher 0:54f5be781526 607 {
jonathonfletcher 0:54f5be781526 608 struct inflate_state FAR *state;
jonathonfletcher 0:54f5be781526 609 unsigned char FAR *next; /* next input */
jonathonfletcher 0:54f5be781526 610 unsigned char FAR *put; /* next output */
jonathonfletcher 0:54f5be781526 611 unsigned have, left; /* available input and output */
jonathonfletcher 0:54f5be781526 612 unsigned long hold; /* bit buffer */
jonathonfletcher 0:54f5be781526 613 unsigned bits; /* bits in bit buffer */
jonathonfletcher 0:54f5be781526 614 unsigned in, out; /* save starting available input and output */
jonathonfletcher 0:54f5be781526 615 unsigned copy; /* number of stored or match bytes to copy */
jonathonfletcher 0:54f5be781526 616 unsigned char FAR *from; /* where to copy match bytes from */
jonathonfletcher 0:54f5be781526 617 code here; /* current decoding table entry */
jonathonfletcher 0:54f5be781526 618 code last; /* parent table entry */
jonathonfletcher 0:54f5be781526 619 unsigned len; /* length to copy for repeats, bits to drop */
jonathonfletcher 0:54f5be781526 620 int ret; /* return code */
jonathonfletcher 0:54f5be781526 621 #ifdef GUNZIP
jonathonfletcher 0:54f5be781526 622 unsigned char hbuf[4]; /* buffer for gzip header crc calculation */
jonathonfletcher 0:54f5be781526 623 #endif
jonathonfletcher 0:54f5be781526 624 static const unsigned short order[19] = /* permutation of code lengths */
jonathonfletcher 0:54f5be781526 625 {16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15};
jonathonfletcher 0:54f5be781526 626
jonathonfletcher 0:54f5be781526 627 if (strm == Z_NULL || strm->state == Z_NULL || strm->next_out == Z_NULL ||
jonathonfletcher 0:54f5be781526 628 (strm->next_in == Z_NULL && strm->avail_in != 0))
jonathonfletcher 0:54f5be781526 629 return Z_STREAM_ERROR;
jonathonfletcher 0:54f5be781526 630
jonathonfletcher 0:54f5be781526 631 state = (struct inflate_state FAR *)strm->state;
jonathonfletcher 0:54f5be781526 632 if (state->mode == TYPE) state->mode = TYPEDO; /* skip check */
jonathonfletcher 0:54f5be781526 633 LOAD();
jonathonfletcher 0:54f5be781526 634 in = have;
jonathonfletcher 0:54f5be781526 635 out = left;
jonathonfletcher 0:54f5be781526 636 ret = Z_OK;
jonathonfletcher 0:54f5be781526 637 for (;;)
jonathonfletcher 0:54f5be781526 638 switch (state->mode) {
jonathonfletcher 0:54f5be781526 639 case HEAD:
jonathonfletcher 0:54f5be781526 640 if (state->wrap == 0) {
jonathonfletcher 0:54f5be781526 641 state->mode = TYPEDO;
jonathonfletcher 0:54f5be781526 642 break;
jonathonfletcher 0:54f5be781526 643 }
jonathonfletcher 0:54f5be781526 644 NEEDBITS(16);
jonathonfletcher 0:54f5be781526 645 #ifdef GUNZIP
jonathonfletcher 0:54f5be781526 646 if ((state->wrap & 2) && hold == 0x8b1f) { /* gzip header */
jonathonfletcher 0:54f5be781526 647 state->check = crc32(0L, Z_NULL, 0);
jonathonfletcher 0:54f5be781526 648 CRC2(state->check, hold);
jonathonfletcher 0:54f5be781526 649 INITBITS();
jonathonfletcher 0:54f5be781526 650 state->mode = FLAGS;
jonathonfletcher 0:54f5be781526 651 break;
jonathonfletcher 0:54f5be781526 652 }
jonathonfletcher 0:54f5be781526 653 state->flags = 0; /* expect zlib header */
jonathonfletcher 0:54f5be781526 654 if (state->head != Z_NULL)
jonathonfletcher 0:54f5be781526 655 state->head->done = -1;
jonathonfletcher 0:54f5be781526 656 if (!(state->wrap & 1) || /* check if zlib header allowed */
jonathonfletcher 0:54f5be781526 657 #else
jonathonfletcher 0:54f5be781526 658 if (
jonathonfletcher 0:54f5be781526 659 #endif
jonathonfletcher 0:54f5be781526 660 ((BITS(8) << 8) + (hold >> 8)) % 31) {
jonathonfletcher 0:54f5be781526 661 strm->msg = (char *)"incorrect header check";
jonathonfletcher 0:54f5be781526 662 state->mode = BAD;
jonathonfletcher 0:54f5be781526 663 break;
jonathonfletcher 0:54f5be781526 664 }
jonathonfletcher 0:54f5be781526 665 if (BITS(4) != Z_DEFLATED) {
jonathonfletcher 0:54f5be781526 666 strm->msg = (char *)"unknown compression method";
jonathonfletcher 0:54f5be781526 667 state->mode = BAD;
jonathonfletcher 0:54f5be781526 668 break;
jonathonfletcher 0:54f5be781526 669 }
jonathonfletcher 0:54f5be781526 670 DROPBITS(4);
jonathonfletcher 0:54f5be781526 671 len = BITS(4) + 8;
jonathonfletcher 0:54f5be781526 672 if (state->wbits == 0)
jonathonfletcher 0:54f5be781526 673 state->wbits = len;
jonathonfletcher 0:54f5be781526 674 else if (len > state->wbits) {
jonathonfletcher 0:54f5be781526 675 strm->msg = (char *)"invalid window size";
jonathonfletcher 0:54f5be781526 676 state->mode = BAD;
jonathonfletcher 0:54f5be781526 677 break;
jonathonfletcher 0:54f5be781526 678 }
jonathonfletcher 0:54f5be781526 679 state->dmax = 1U << len;
jonathonfletcher 0:54f5be781526 680 Tracev((stderr, "inflate: zlib header ok\n"));
jonathonfletcher 0:54f5be781526 681 strm->adler = state->check = adler32(0L, Z_NULL, 0);
jonathonfletcher 0:54f5be781526 682 state->mode = hold & 0x200 ? DICTID : TYPE;
jonathonfletcher 0:54f5be781526 683 INITBITS();
jonathonfletcher 0:54f5be781526 684 break;
jonathonfletcher 0:54f5be781526 685 #ifdef GUNZIP
jonathonfletcher 0:54f5be781526 686 case FLAGS:
jonathonfletcher 0:54f5be781526 687 NEEDBITS(16);
jonathonfletcher 0:54f5be781526 688 state->flags = (int)(hold);
jonathonfletcher 0:54f5be781526 689 if ((state->flags & 0xff) != Z_DEFLATED) {
jonathonfletcher 0:54f5be781526 690 strm->msg = (char *)"unknown compression method";
jonathonfletcher 0:54f5be781526 691 state->mode = BAD;
jonathonfletcher 0:54f5be781526 692 break;
jonathonfletcher 0:54f5be781526 693 }
jonathonfletcher 0:54f5be781526 694 if (state->flags & 0xe000) {
jonathonfletcher 0:54f5be781526 695 strm->msg = (char *)"unknown header flags set";
jonathonfletcher 0:54f5be781526 696 state->mode = BAD;
jonathonfletcher 0:54f5be781526 697 break;
jonathonfletcher 0:54f5be781526 698 }
jonathonfletcher 0:54f5be781526 699 if (state->head != Z_NULL)
jonathonfletcher 0:54f5be781526 700 state->head->text = (int)((hold >> 8) & 1);
jonathonfletcher 0:54f5be781526 701 if (state->flags & 0x0200) CRC2(state->check, hold);
jonathonfletcher 0:54f5be781526 702 INITBITS();
jonathonfletcher 0:54f5be781526 703 state->mode = TIME;
jonathonfletcher 0:54f5be781526 704 case TIME:
jonathonfletcher 0:54f5be781526 705 NEEDBITS(32);
jonathonfletcher 0:54f5be781526 706 if (state->head != Z_NULL)
jonathonfletcher 0:54f5be781526 707 state->head->time = hold;
jonathonfletcher 0:54f5be781526 708 if (state->flags & 0x0200) CRC4(state->check, hold);
jonathonfletcher 0:54f5be781526 709 INITBITS();
jonathonfletcher 0:54f5be781526 710 state->mode = OS;
jonathonfletcher 0:54f5be781526 711 case OS:
jonathonfletcher 0:54f5be781526 712 NEEDBITS(16);
jonathonfletcher 0:54f5be781526 713 if (state->head != Z_NULL) {
jonathonfletcher 0:54f5be781526 714 state->head->xflags = (int)(hold & 0xff);
jonathonfletcher 0:54f5be781526 715 state->head->os = (int)(hold >> 8);
jonathonfletcher 0:54f5be781526 716 }
jonathonfletcher 0:54f5be781526 717 if (state->flags & 0x0200) CRC2(state->check, hold);
jonathonfletcher 0:54f5be781526 718 INITBITS();
jonathonfletcher 0:54f5be781526 719 state->mode = EXLEN;
jonathonfletcher 0:54f5be781526 720 case EXLEN:
jonathonfletcher 0:54f5be781526 721 if (state->flags & 0x0400) {
jonathonfletcher 0:54f5be781526 722 NEEDBITS(16);
jonathonfletcher 0:54f5be781526 723 state->length = (unsigned)(hold);
jonathonfletcher 0:54f5be781526 724 if (state->head != Z_NULL)
jonathonfletcher 0:54f5be781526 725 state->head->extra_len = (unsigned)hold;
jonathonfletcher 0:54f5be781526 726 if (state->flags & 0x0200) CRC2(state->check, hold);
jonathonfletcher 0:54f5be781526 727 INITBITS();
jonathonfletcher 0:54f5be781526 728 }
jonathonfletcher 0:54f5be781526 729 else if (state->head != Z_NULL)
jonathonfletcher 0:54f5be781526 730 state->head->extra = Z_NULL;
jonathonfletcher 0:54f5be781526 731 state->mode = EXTRA;
jonathonfletcher 0:54f5be781526 732 case EXTRA:
jonathonfletcher 0:54f5be781526 733 if (state->flags & 0x0400) {
jonathonfletcher 0:54f5be781526 734 copy = state->length;
jonathonfletcher 0:54f5be781526 735 if (copy > have) copy = have;
jonathonfletcher 0:54f5be781526 736 if (copy) {
jonathonfletcher 0:54f5be781526 737 if (state->head != Z_NULL &&
jonathonfletcher 0:54f5be781526 738 state->head->extra != Z_NULL) {
jonathonfletcher 0:54f5be781526 739 len = state->head->extra_len - state->length;
jonathonfletcher 0:54f5be781526 740 zmemcpy(state->head->extra + len, next,
jonathonfletcher 0:54f5be781526 741 len + copy > state->head->extra_max ?
jonathonfletcher 0:54f5be781526 742 state->head->extra_max - len : copy);
jonathonfletcher 0:54f5be781526 743 }
jonathonfletcher 0:54f5be781526 744 if (state->flags & 0x0200)
jonathonfletcher 0:54f5be781526 745 state->check = crc32(state->check, next, copy);
jonathonfletcher 0:54f5be781526 746 have -= copy;
jonathonfletcher 0:54f5be781526 747 next += copy;
jonathonfletcher 0:54f5be781526 748 state->length -= copy;
jonathonfletcher 0:54f5be781526 749 }
jonathonfletcher 0:54f5be781526 750 if (state->length) goto inf_leave;
jonathonfletcher 0:54f5be781526 751 }
jonathonfletcher 0:54f5be781526 752 state->length = 0;
jonathonfletcher 0:54f5be781526 753 state->mode = NAME;
jonathonfletcher 0:54f5be781526 754 case NAME:
jonathonfletcher 0:54f5be781526 755 if (state->flags & 0x0800) {
jonathonfletcher 0:54f5be781526 756 if (have == 0) goto inf_leave;
jonathonfletcher 0:54f5be781526 757 copy = 0;
jonathonfletcher 0:54f5be781526 758 do {
jonathonfletcher 0:54f5be781526 759 len = (unsigned)(next[copy++]);
jonathonfletcher 0:54f5be781526 760 if (state->head != Z_NULL &&
jonathonfletcher 0:54f5be781526 761 state->head->name != Z_NULL &&
jonathonfletcher 0:54f5be781526 762 state->length < state->head->name_max)
jonathonfletcher 0:54f5be781526 763 state->head->name[state->length++] = len;
jonathonfletcher 0:54f5be781526 764 } while (len && copy < have);
jonathonfletcher 0:54f5be781526 765 if (state->flags & 0x0200)
jonathonfletcher 0:54f5be781526 766 state->check = crc32(state->check, next, copy);
jonathonfletcher 0:54f5be781526 767 have -= copy;
jonathonfletcher 0:54f5be781526 768 next += copy;
jonathonfletcher 0:54f5be781526 769 if (len) goto inf_leave;
jonathonfletcher 0:54f5be781526 770 }
jonathonfletcher 0:54f5be781526 771 else if (state->head != Z_NULL)
jonathonfletcher 0:54f5be781526 772 state->head->name = Z_NULL;
jonathonfletcher 0:54f5be781526 773 state->length = 0;
jonathonfletcher 0:54f5be781526 774 state->mode = COMMENT;
jonathonfletcher 0:54f5be781526 775 case COMMENT:
jonathonfletcher 0:54f5be781526 776 if (state->flags & 0x1000) {
jonathonfletcher 0:54f5be781526 777 if (have == 0) goto inf_leave;
jonathonfletcher 0:54f5be781526 778 copy = 0;
jonathonfletcher 0:54f5be781526 779 do {
jonathonfletcher 0:54f5be781526 780 len = (unsigned)(next[copy++]);
jonathonfletcher 0:54f5be781526 781 if (state->head != Z_NULL &&
jonathonfletcher 0:54f5be781526 782 state->head->comment != Z_NULL &&
jonathonfletcher 0:54f5be781526 783 state->length < state->head->comm_max)
jonathonfletcher 0:54f5be781526 784 state->head->comment[state->length++] = len;
jonathonfletcher 0:54f5be781526 785 } while (len && copy < have);
jonathonfletcher 0:54f5be781526 786 if (state->flags & 0x0200)
jonathonfletcher 0:54f5be781526 787 state->check = crc32(state->check, next, copy);
jonathonfletcher 0:54f5be781526 788 have -= copy;
jonathonfletcher 0:54f5be781526 789 next += copy;
jonathonfletcher 0:54f5be781526 790 if (len) goto inf_leave;
jonathonfletcher 0:54f5be781526 791 }
jonathonfletcher 0:54f5be781526 792 else if (state->head != Z_NULL)
jonathonfletcher 0:54f5be781526 793 state->head->comment = Z_NULL;
jonathonfletcher 0:54f5be781526 794 state->mode = HCRC;
jonathonfletcher 0:54f5be781526 795 case HCRC:
jonathonfletcher 0:54f5be781526 796 if (state->flags & 0x0200) {
jonathonfletcher 0:54f5be781526 797 NEEDBITS(16);
jonathonfletcher 0:54f5be781526 798 if (hold != (state->check & 0xffff)) {
jonathonfletcher 0:54f5be781526 799 strm->msg = (char *)"header crc mismatch";
jonathonfletcher 0:54f5be781526 800 state->mode = BAD;
jonathonfletcher 0:54f5be781526 801 break;
jonathonfletcher 0:54f5be781526 802 }
jonathonfletcher 0:54f5be781526 803 INITBITS();
jonathonfletcher 0:54f5be781526 804 }
jonathonfletcher 0:54f5be781526 805 if (state->head != Z_NULL) {
jonathonfletcher 0:54f5be781526 806 state->head->hcrc = (int)((state->flags >> 9) & 1);
jonathonfletcher 0:54f5be781526 807 state->head->done = 1;
jonathonfletcher 0:54f5be781526 808 }
jonathonfletcher 0:54f5be781526 809 strm->adler = state->check = crc32(0L, Z_NULL, 0);
jonathonfletcher 0:54f5be781526 810 state->mode = TYPE;
jonathonfletcher 0:54f5be781526 811 break;
jonathonfletcher 0:54f5be781526 812 #endif
jonathonfletcher 0:54f5be781526 813 case DICTID:
jonathonfletcher 0:54f5be781526 814 NEEDBITS(32);
jonathonfletcher 0:54f5be781526 815 strm->adler = state->check = ZSWAP32(hold);
jonathonfletcher 0:54f5be781526 816 INITBITS();
jonathonfletcher 0:54f5be781526 817 state->mode = DICT;
jonathonfletcher 0:54f5be781526 818 case DICT:
jonathonfletcher 0:54f5be781526 819 if (state->havedict == 0) {
jonathonfletcher 0:54f5be781526 820 RESTORE();
jonathonfletcher 0:54f5be781526 821 return Z_NEED_DICT;
jonathonfletcher 0:54f5be781526 822 }
jonathonfletcher 0:54f5be781526 823 strm->adler = state->check = adler32(0L, Z_NULL, 0);
jonathonfletcher 0:54f5be781526 824 state->mode = TYPE;
jonathonfletcher 0:54f5be781526 825 case TYPE:
jonathonfletcher 0:54f5be781526 826 if (flush == Z_BLOCK || flush == Z_TREES) goto inf_leave;
jonathonfletcher 0:54f5be781526 827 case TYPEDO:
jonathonfletcher 0:54f5be781526 828 if (state->last) {
jonathonfletcher 0:54f5be781526 829 BYTEBITS();
jonathonfletcher 0:54f5be781526 830 state->mode = CHECK;
jonathonfletcher 0:54f5be781526 831 break;
jonathonfletcher 0:54f5be781526 832 }
jonathonfletcher 0:54f5be781526 833 NEEDBITS(3);
jonathonfletcher 0:54f5be781526 834 state->last = BITS(1);
jonathonfletcher 0:54f5be781526 835 DROPBITS(1);
jonathonfletcher 0:54f5be781526 836 switch (BITS(2)) {
jonathonfletcher 0:54f5be781526 837 case 0: /* stored block */
jonathonfletcher 0:54f5be781526 838 Tracev((stderr, "inflate: stored block%s\n",
jonathonfletcher 0:54f5be781526 839 state->last ? " (last)" : ""));
jonathonfletcher 0:54f5be781526 840 state->mode = STORED;
jonathonfletcher 0:54f5be781526 841 break;
jonathonfletcher 0:54f5be781526 842 case 1: /* fixed block */
jonathonfletcher 0:54f5be781526 843 fixedtables(state);
jonathonfletcher 0:54f5be781526 844 Tracev((stderr, "inflate: fixed codes block%s\n",
jonathonfletcher 0:54f5be781526 845 state->last ? " (last)" : ""));
jonathonfletcher 0:54f5be781526 846 state->mode = LEN_; /* decode codes */
jonathonfletcher 0:54f5be781526 847 if (flush == Z_TREES) {
jonathonfletcher 0:54f5be781526 848 DROPBITS(2);
jonathonfletcher 0:54f5be781526 849 goto inf_leave;
jonathonfletcher 0:54f5be781526 850 }
jonathonfletcher 0:54f5be781526 851 break;
jonathonfletcher 0:54f5be781526 852 case 2: /* dynamic block */
jonathonfletcher 0:54f5be781526 853 Tracev((stderr, "inflate: dynamic codes block%s\n",
jonathonfletcher 0:54f5be781526 854 state->last ? " (last)" : ""));
jonathonfletcher 0:54f5be781526 855 state->mode = TABLE;
jonathonfletcher 0:54f5be781526 856 break;
jonathonfletcher 0:54f5be781526 857 case 3:
jonathonfletcher 0:54f5be781526 858 strm->msg = (char *)"invalid block type";
jonathonfletcher 0:54f5be781526 859 state->mode = BAD;
jonathonfletcher 0:54f5be781526 860 }
jonathonfletcher 0:54f5be781526 861 DROPBITS(2);
jonathonfletcher 0:54f5be781526 862 break;
jonathonfletcher 0:54f5be781526 863 case STORED:
jonathonfletcher 0:54f5be781526 864 BYTEBITS(); /* go to byte boundary */
jonathonfletcher 0:54f5be781526 865 NEEDBITS(32);
jonathonfletcher 0:54f5be781526 866 if ((hold & 0xffff) != ((hold >> 16) ^ 0xffff)) {
jonathonfletcher 0:54f5be781526 867 strm->msg = (char *)"invalid stored block lengths";
jonathonfletcher 0:54f5be781526 868 state->mode = BAD;
jonathonfletcher 0:54f5be781526 869 break;
jonathonfletcher 0:54f5be781526 870 }
jonathonfletcher 0:54f5be781526 871 state->length = (unsigned)hold & 0xffff;
jonathonfletcher 0:54f5be781526 872 Tracev((stderr, "inflate: stored length %u\n",
jonathonfletcher 0:54f5be781526 873 state->length));
jonathonfletcher 0:54f5be781526 874 INITBITS();
jonathonfletcher 0:54f5be781526 875 state->mode = COPY_;
jonathonfletcher 0:54f5be781526 876 if (flush == Z_TREES) goto inf_leave;
jonathonfletcher 0:54f5be781526 877 case COPY_:
jonathonfletcher 0:54f5be781526 878 state->mode = COPY;
jonathonfletcher 0:54f5be781526 879 case COPY:
jonathonfletcher 0:54f5be781526 880 copy = state->length;
jonathonfletcher 0:54f5be781526 881 if (copy) {
jonathonfletcher 0:54f5be781526 882 if (copy > have) copy = have;
jonathonfletcher 0:54f5be781526 883 if (copy > left) copy = left;
jonathonfletcher 0:54f5be781526 884 if (copy == 0) goto inf_leave;
jonathonfletcher 0:54f5be781526 885 zmemcpy(put, next, copy);
jonathonfletcher 0:54f5be781526 886 have -= copy;
jonathonfletcher 0:54f5be781526 887 next += copy;
jonathonfletcher 0:54f5be781526 888 left -= copy;
jonathonfletcher 0:54f5be781526 889 put += copy;
jonathonfletcher 0:54f5be781526 890 state->length -= copy;
jonathonfletcher 0:54f5be781526 891 break;
jonathonfletcher 0:54f5be781526 892 }
jonathonfletcher 0:54f5be781526 893 Tracev((stderr, "inflate: stored end\n"));
jonathonfletcher 0:54f5be781526 894 state->mode = TYPE;
jonathonfletcher 0:54f5be781526 895 break;
jonathonfletcher 0:54f5be781526 896 case TABLE:
jonathonfletcher 0:54f5be781526 897 NEEDBITS(14);
jonathonfletcher 0:54f5be781526 898 state->nlen = BITS(5) + 257;
jonathonfletcher 0:54f5be781526 899 DROPBITS(5);
jonathonfletcher 0:54f5be781526 900 state->ndist = BITS(5) + 1;
jonathonfletcher 0:54f5be781526 901 DROPBITS(5);
jonathonfletcher 0:54f5be781526 902 state->ncode = BITS(4) + 4;
jonathonfletcher 0:54f5be781526 903 DROPBITS(4);
jonathonfletcher 0:54f5be781526 904 #ifndef PKZIP_BUG_WORKAROUND
jonathonfletcher 0:54f5be781526 905 if (state->nlen > 286 || state->ndist > 30) {
jonathonfletcher 0:54f5be781526 906 strm->msg = (char *)"too many length or distance symbols";
jonathonfletcher 0:54f5be781526 907 state->mode = BAD;
jonathonfletcher 0:54f5be781526 908 break;
jonathonfletcher 0:54f5be781526 909 }
jonathonfletcher 0:54f5be781526 910 #endif
jonathonfletcher 0:54f5be781526 911 Tracev((stderr, "inflate: table sizes ok\n"));
jonathonfletcher 0:54f5be781526 912 state->have = 0;
jonathonfletcher 0:54f5be781526 913 state->mode = LENLENS;
jonathonfletcher 0:54f5be781526 914 case LENLENS:
jonathonfletcher 0:54f5be781526 915 while (state->have < state->ncode) {
jonathonfletcher 0:54f5be781526 916 NEEDBITS(3);
jonathonfletcher 0:54f5be781526 917 state->lens[order[state->have++]] = (unsigned short)BITS(3);
jonathonfletcher 0:54f5be781526 918 DROPBITS(3);
jonathonfletcher 0:54f5be781526 919 }
jonathonfletcher 0:54f5be781526 920 while (state->have < 19)
jonathonfletcher 0:54f5be781526 921 state->lens[order[state->have++]] = 0;
jonathonfletcher 0:54f5be781526 922 state->next = state->codes;
jonathonfletcher 0:54f5be781526 923 state->lencode = (code const FAR *)(state->next);
jonathonfletcher 0:54f5be781526 924 state->lenbits = 7;
jonathonfletcher 0:54f5be781526 925 ret = inflate_table(CODES, state->lens, 19, &(state->next),
jonathonfletcher 0:54f5be781526 926 &(state->lenbits), state->work);
jonathonfletcher 0:54f5be781526 927 if (ret) {
jonathonfletcher 0:54f5be781526 928 strm->msg = (char *)"invalid code lengths set";
jonathonfletcher 0:54f5be781526 929 state->mode = BAD;
jonathonfletcher 0:54f5be781526 930 break;
jonathonfletcher 0:54f5be781526 931 }
jonathonfletcher 0:54f5be781526 932 Tracev((stderr, "inflate: code lengths ok\n"));
jonathonfletcher 0:54f5be781526 933 state->have = 0;
jonathonfletcher 0:54f5be781526 934 state->mode = CODELENS;
jonathonfletcher 0:54f5be781526 935 case CODELENS:
jonathonfletcher 0:54f5be781526 936 while (state->have < state->nlen + state->ndist) {
jonathonfletcher 0:54f5be781526 937 for (;;) {
jonathonfletcher 0:54f5be781526 938 here = state->lencode[BITS(state->lenbits)];
jonathonfletcher 0:54f5be781526 939 if ((unsigned)(here.bits) <= bits) break;
jonathonfletcher 0:54f5be781526 940 PULLBYTE();
jonathonfletcher 0:54f5be781526 941 }
jonathonfletcher 0:54f5be781526 942 if (here.val < 16) {
jonathonfletcher 0:54f5be781526 943 DROPBITS(here.bits);
jonathonfletcher 0:54f5be781526 944 state->lens[state->have++] = here.val;
jonathonfletcher 0:54f5be781526 945 }
jonathonfletcher 0:54f5be781526 946 else {
jonathonfletcher 0:54f5be781526 947 if (here.val == 16) {
jonathonfletcher 0:54f5be781526 948 NEEDBITS(here.bits + 2);
jonathonfletcher 0:54f5be781526 949 DROPBITS(here.bits);
jonathonfletcher 0:54f5be781526 950 if (state->have == 0) {
jonathonfletcher 0:54f5be781526 951 strm->msg = (char *)"invalid bit length repeat";
jonathonfletcher 0:54f5be781526 952 state->mode = BAD;
jonathonfletcher 0:54f5be781526 953 break;
jonathonfletcher 0:54f5be781526 954 }
jonathonfletcher 0:54f5be781526 955 len = state->lens[state->have - 1];
jonathonfletcher 0:54f5be781526 956 copy = 3 + BITS(2);
jonathonfletcher 0:54f5be781526 957 DROPBITS(2);
jonathonfletcher 0:54f5be781526 958 }
jonathonfletcher 0:54f5be781526 959 else if (here.val == 17) {
jonathonfletcher 0:54f5be781526 960 NEEDBITS(here.bits + 3);
jonathonfletcher 0:54f5be781526 961 DROPBITS(here.bits);
jonathonfletcher 0:54f5be781526 962 len = 0;
jonathonfletcher 0:54f5be781526 963 copy = 3 + BITS(3);
jonathonfletcher 0:54f5be781526 964 DROPBITS(3);
jonathonfletcher 0:54f5be781526 965 }
jonathonfletcher 0:54f5be781526 966 else {
jonathonfletcher 0:54f5be781526 967 NEEDBITS(here.bits + 7);
jonathonfletcher 0:54f5be781526 968 DROPBITS(here.bits);
jonathonfletcher 0:54f5be781526 969 len = 0;
jonathonfletcher 0:54f5be781526 970 copy = 11 + BITS(7);
jonathonfletcher 0:54f5be781526 971 DROPBITS(7);
jonathonfletcher 0:54f5be781526 972 }
jonathonfletcher 0:54f5be781526 973 if (state->have + copy > state->nlen + state->ndist) {
jonathonfletcher 0:54f5be781526 974 strm->msg = (char *)"invalid bit length repeat";
jonathonfletcher 0:54f5be781526 975 state->mode = BAD;
jonathonfletcher 0:54f5be781526 976 break;
jonathonfletcher 0:54f5be781526 977 }
jonathonfletcher 0:54f5be781526 978 while (copy--)
jonathonfletcher 0:54f5be781526 979 state->lens[state->have++] = (unsigned short)len;
jonathonfletcher 0:54f5be781526 980 }
jonathonfletcher 0:54f5be781526 981 }
jonathonfletcher 0:54f5be781526 982
jonathonfletcher 0:54f5be781526 983 /* handle error breaks in while */
jonathonfletcher 0:54f5be781526 984 if (state->mode == BAD) break;
jonathonfletcher 0:54f5be781526 985
jonathonfletcher 0:54f5be781526 986 /* check for end-of-block code (better have one) */
jonathonfletcher 0:54f5be781526 987 if (state->lens[256] == 0) {
jonathonfletcher 0:54f5be781526 988 strm->msg = (char *)"invalid code -- missing end-of-block";
jonathonfletcher 0:54f5be781526 989 state->mode = BAD;
jonathonfletcher 0:54f5be781526 990 break;
jonathonfletcher 0:54f5be781526 991 }
jonathonfletcher 0:54f5be781526 992
jonathonfletcher 0:54f5be781526 993 /* build code tables -- note: do not change the lenbits or distbits
jonathonfletcher 0:54f5be781526 994 values here (9 and 6) without reading the comments in inftrees.h
jonathonfletcher 0:54f5be781526 995 concerning the ENOUGH constants, which depend on those values */
jonathonfletcher 0:54f5be781526 996 state->next = state->codes;
jonathonfletcher 0:54f5be781526 997 state->lencode = (code const FAR *)(state->next);
jonathonfletcher 0:54f5be781526 998 state->lenbits = 9;
jonathonfletcher 0:54f5be781526 999 ret = inflate_table(LENS, state->lens, state->nlen, &(state->next),
jonathonfletcher 0:54f5be781526 1000 &(state->lenbits), state->work);
jonathonfletcher 0:54f5be781526 1001 if (ret) {
jonathonfletcher 0:54f5be781526 1002 strm->msg = (char *)"invalid literal/lengths set";
jonathonfletcher 0:54f5be781526 1003 state->mode = BAD;
jonathonfletcher 0:54f5be781526 1004 break;
jonathonfletcher 0:54f5be781526 1005 }
jonathonfletcher 0:54f5be781526 1006 state->distcode = (code const FAR *)(state->next);
jonathonfletcher 0:54f5be781526 1007 state->distbits = 6;
jonathonfletcher 0:54f5be781526 1008 ret = inflate_table(DISTS, state->lens + state->nlen, state->ndist,
jonathonfletcher 0:54f5be781526 1009 &(state->next), &(state->distbits), state->work);
jonathonfletcher 0:54f5be781526 1010 if (ret) {
jonathonfletcher 0:54f5be781526 1011 strm->msg = (char *)"invalid distances set";
jonathonfletcher 0:54f5be781526 1012 state->mode = BAD;
jonathonfletcher 0:54f5be781526 1013 break;
jonathonfletcher 0:54f5be781526 1014 }
jonathonfletcher 0:54f5be781526 1015 Tracev((stderr, "inflate: codes ok\n"));
jonathonfletcher 0:54f5be781526 1016 state->mode = LEN_;
jonathonfletcher 0:54f5be781526 1017 if (flush == Z_TREES) goto inf_leave;
jonathonfletcher 0:54f5be781526 1018 case LEN_:
jonathonfletcher 0:54f5be781526 1019 state->mode = LEN;
jonathonfletcher 0:54f5be781526 1020 case LEN:
jonathonfletcher 0:54f5be781526 1021 if (have >= 6 && left >= 258) {
jonathonfletcher 0:54f5be781526 1022 RESTORE();
jonathonfletcher 0:54f5be781526 1023 inflate_fast(strm, out);
jonathonfletcher 0:54f5be781526 1024 LOAD();
jonathonfletcher 0:54f5be781526 1025 if (state->mode == TYPE)
jonathonfletcher 0:54f5be781526 1026 state->back = -1;
jonathonfletcher 0:54f5be781526 1027 break;
jonathonfletcher 0:54f5be781526 1028 }
jonathonfletcher 0:54f5be781526 1029 state->back = 0;
jonathonfletcher 0:54f5be781526 1030 for (;;) {
jonathonfletcher 0:54f5be781526 1031 here = state->lencode[BITS(state->lenbits)];
jonathonfletcher 0:54f5be781526 1032 if ((unsigned)(here.bits) <= bits) break;
jonathonfletcher 0:54f5be781526 1033 PULLBYTE();
jonathonfletcher 0:54f5be781526 1034 }
jonathonfletcher 0:54f5be781526 1035 if (here.op && (here.op & 0xf0) == 0) {
jonathonfletcher 0:54f5be781526 1036 last = here;
jonathonfletcher 0:54f5be781526 1037 for (;;) {
jonathonfletcher 0:54f5be781526 1038 here = state->lencode[last.val +
jonathonfletcher 0:54f5be781526 1039 (BITS(last.bits + last.op) >> last.bits)];
jonathonfletcher 0:54f5be781526 1040 if ((unsigned)(last.bits + here.bits) <= bits) break;
jonathonfletcher 0:54f5be781526 1041 PULLBYTE();
jonathonfletcher 0:54f5be781526 1042 }
jonathonfletcher 0:54f5be781526 1043 DROPBITS(last.bits);
jonathonfletcher 0:54f5be781526 1044 state->back += last.bits;
jonathonfletcher 0:54f5be781526 1045 }
jonathonfletcher 0:54f5be781526 1046 DROPBITS(here.bits);
jonathonfletcher 0:54f5be781526 1047 state->back += here.bits;
jonathonfletcher 0:54f5be781526 1048 state->length = (unsigned)here.val;
jonathonfletcher 0:54f5be781526 1049 if ((int)(here.op) == 0) {
jonathonfletcher 0:54f5be781526 1050 Tracevv((stderr, here.val >= 0x20 && here.val < 0x7f ?
jonathonfletcher 0:54f5be781526 1051 "inflate: literal '%c'\n" :
jonathonfletcher 0:54f5be781526 1052 "inflate: literal 0x%02x\n", here.val));
jonathonfletcher 0:54f5be781526 1053 state->mode = LIT;
jonathonfletcher 0:54f5be781526 1054 break;
jonathonfletcher 0:54f5be781526 1055 }
jonathonfletcher 0:54f5be781526 1056 if (here.op & 32) {
jonathonfletcher 0:54f5be781526 1057 Tracevv((stderr, "inflate: end of block\n"));
jonathonfletcher 0:54f5be781526 1058 state->back = -1;
jonathonfletcher 0:54f5be781526 1059 state->mode = TYPE;
jonathonfletcher 0:54f5be781526 1060 break;
jonathonfletcher 0:54f5be781526 1061 }
jonathonfletcher 0:54f5be781526 1062 if (here.op & 64) {
jonathonfletcher 0:54f5be781526 1063 strm->msg = (char *)"invalid literal/length code";
jonathonfletcher 0:54f5be781526 1064 state->mode = BAD;
jonathonfletcher 0:54f5be781526 1065 break;
jonathonfletcher 0:54f5be781526 1066 }
jonathonfletcher 0:54f5be781526 1067 state->extra = (unsigned)(here.op) & 15;
jonathonfletcher 0:54f5be781526 1068 state->mode = LENEXT;
jonathonfletcher 0:54f5be781526 1069 case LENEXT:
jonathonfletcher 0:54f5be781526 1070 if (state->extra) {
jonathonfletcher 0:54f5be781526 1071 NEEDBITS(state->extra);
jonathonfletcher 0:54f5be781526 1072 state->length += BITS(state->extra);
jonathonfletcher 0:54f5be781526 1073 DROPBITS(state->extra);
jonathonfletcher 0:54f5be781526 1074 state->back += state->extra;
jonathonfletcher 0:54f5be781526 1075 }
jonathonfletcher 0:54f5be781526 1076 Tracevv((stderr, "inflate: length %u\n", state->length));
jonathonfletcher 0:54f5be781526 1077 state->was = state->length;
jonathonfletcher 0:54f5be781526 1078 state->mode = DIST;
jonathonfletcher 0:54f5be781526 1079 case DIST:
jonathonfletcher 0:54f5be781526 1080 for (;;) {
jonathonfletcher 0:54f5be781526 1081 here = state->distcode[BITS(state->distbits)];
jonathonfletcher 0:54f5be781526 1082 if ((unsigned)(here.bits) <= bits) break;
jonathonfletcher 0:54f5be781526 1083 PULLBYTE();
jonathonfletcher 0:54f5be781526 1084 }
jonathonfletcher 0:54f5be781526 1085 if ((here.op & 0xf0) == 0) {
jonathonfletcher 0:54f5be781526 1086 last = here;
jonathonfletcher 0:54f5be781526 1087 for (;;) {
jonathonfletcher 0:54f5be781526 1088 here = state->distcode[last.val +
jonathonfletcher 0:54f5be781526 1089 (BITS(last.bits + last.op) >> last.bits)];
jonathonfletcher 0:54f5be781526 1090 if ((unsigned)(last.bits + here.bits) <= bits) break;
jonathonfletcher 0:54f5be781526 1091 PULLBYTE();
jonathonfletcher 0:54f5be781526 1092 }
jonathonfletcher 0:54f5be781526 1093 DROPBITS(last.bits);
jonathonfletcher 0:54f5be781526 1094 state->back += last.bits;
jonathonfletcher 0:54f5be781526 1095 }
jonathonfletcher 0:54f5be781526 1096 DROPBITS(here.bits);
jonathonfletcher 0:54f5be781526 1097 state->back += here.bits;
jonathonfletcher 0:54f5be781526 1098 if (here.op & 64) {
jonathonfletcher 0:54f5be781526 1099 strm->msg = (char *)"invalid distance code";
jonathonfletcher 0:54f5be781526 1100 state->mode = BAD;
jonathonfletcher 0:54f5be781526 1101 break;
jonathonfletcher 0:54f5be781526 1102 }
jonathonfletcher 0:54f5be781526 1103 state->offset = (unsigned)here.val;
jonathonfletcher 0:54f5be781526 1104 state->extra = (unsigned)(here.op) & 15;
jonathonfletcher 0:54f5be781526 1105 state->mode = DISTEXT;
jonathonfletcher 0:54f5be781526 1106 case DISTEXT:
jonathonfletcher 0:54f5be781526 1107 if (state->extra) {
jonathonfletcher 0:54f5be781526 1108 NEEDBITS(state->extra);
jonathonfletcher 0:54f5be781526 1109 state->offset += BITS(state->extra);
jonathonfletcher 0:54f5be781526 1110 DROPBITS(state->extra);
jonathonfletcher 0:54f5be781526 1111 state->back += state->extra;
jonathonfletcher 0:54f5be781526 1112 }
jonathonfletcher 0:54f5be781526 1113 #ifdef INFLATE_STRICT
jonathonfletcher 0:54f5be781526 1114 if (state->offset > state->dmax) {
jonathonfletcher 0:54f5be781526 1115 strm->msg = (char *)"invalid distance too far back";
jonathonfletcher 0:54f5be781526 1116 state->mode = BAD;
jonathonfletcher 0:54f5be781526 1117 break;
jonathonfletcher 0:54f5be781526 1118 }
jonathonfletcher 0:54f5be781526 1119 #endif
jonathonfletcher 0:54f5be781526 1120 Tracevv((stderr, "inflate: distance %u\n", state->offset));
jonathonfletcher 0:54f5be781526 1121 state->mode = MATCH;
jonathonfletcher 0:54f5be781526 1122 case MATCH:
jonathonfletcher 0:54f5be781526 1123 if (left == 0) goto inf_leave;
jonathonfletcher 0:54f5be781526 1124 copy = out - left;
jonathonfletcher 0:54f5be781526 1125 if (state->offset > copy) { /* copy from window */
jonathonfletcher 0:54f5be781526 1126 copy = state->offset - copy;
jonathonfletcher 0:54f5be781526 1127 if (copy > state->whave) {
jonathonfletcher 0:54f5be781526 1128 if (state->sane) {
jonathonfletcher 0:54f5be781526 1129 strm->msg = (char *)"invalid distance too far back";
jonathonfletcher 0:54f5be781526 1130 state->mode = BAD;
jonathonfletcher 0:54f5be781526 1131 break;
jonathonfletcher 0:54f5be781526 1132 }
jonathonfletcher 0:54f5be781526 1133 #ifdef INFLATE_ALLOW_INVALID_DISTANCE_TOOFAR_ARRR
jonathonfletcher 0:54f5be781526 1134 Trace((stderr, "inflate.c too far\n"));
jonathonfletcher 0:54f5be781526 1135 copy -= state->whave;
jonathonfletcher 0:54f5be781526 1136 if (copy > state->length) copy = state->length;
jonathonfletcher 0:54f5be781526 1137 if (copy > left) copy = left;
jonathonfletcher 0:54f5be781526 1138 left -= copy;
jonathonfletcher 0:54f5be781526 1139 state->length -= copy;
jonathonfletcher 0:54f5be781526 1140 do {
jonathonfletcher 0:54f5be781526 1141 *put++ = 0;
jonathonfletcher 0:54f5be781526 1142 } while (--copy);
jonathonfletcher 0:54f5be781526 1143 if (state->length == 0) state->mode = LEN;
jonathonfletcher 0:54f5be781526 1144 break;
jonathonfletcher 0:54f5be781526 1145 #endif
jonathonfletcher 0:54f5be781526 1146 }
jonathonfletcher 0:54f5be781526 1147 if (copy > state->wnext) {
jonathonfletcher 0:54f5be781526 1148 copy -= state->wnext;
jonathonfletcher 0:54f5be781526 1149 from = state->window + (state->wsize - copy);
jonathonfletcher 0:54f5be781526 1150 }
jonathonfletcher 0:54f5be781526 1151 else
jonathonfletcher 0:54f5be781526 1152 from = state->window + (state->wnext - copy);
jonathonfletcher 0:54f5be781526 1153 if (copy > state->length) copy = state->length;
jonathonfletcher 0:54f5be781526 1154 }
jonathonfletcher 0:54f5be781526 1155 else { /* copy from output */
jonathonfletcher 0:54f5be781526 1156 from = put - state->offset;
jonathonfletcher 0:54f5be781526 1157 copy = state->length;
jonathonfletcher 0:54f5be781526 1158 }
jonathonfletcher 0:54f5be781526 1159 if (copy > left) copy = left;
jonathonfletcher 0:54f5be781526 1160 left -= copy;
jonathonfletcher 0:54f5be781526 1161 state->length -= copy;
jonathonfletcher 0:54f5be781526 1162 do {
jonathonfletcher 0:54f5be781526 1163 *put++ = *from++;
jonathonfletcher 0:54f5be781526 1164 } while (--copy);
jonathonfletcher 0:54f5be781526 1165 if (state->length == 0) state->mode = LEN;
jonathonfletcher 0:54f5be781526 1166 break;
jonathonfletcher 0:54f5be781526 1167 case LIT:
jonathonfletcher 0:54f5be781526 1168 if (left == 0) goto inf_leave;
jonathonfletcher 0:54f5be781526 1169 *put++ = (unsigned char)(state->length);
jonathonfletcher 0:54f5be781526 1170 left--;
jonathonfletcher 0:54f5be781526 1171 state->mode = LEN;
jonathonfletcher 0:54f5be781526 1172 break;
jonathonfletcher 0:54f5be781526 1173 case CHECK:
jonathonfletcher 0:54f5be781526 1174 if (state->wrap) {
jonathonfletcher 0:54f5be781526 1175 NEEDBITS(32);
jonathonfletcher 0:54f5be781526 1176 out -= left;
jonathonfletcher 0:54f5be781526 1177 strm->total_out += out;
jonathonfletcher 0:54f5be781526 1178 state->total += out;
jonathonfletcher 0:54f5be781526 1179 if (out)
jonathonfletcher 0:54f5be781526 1180 strm->adler = state->check =
jonathonfletcher 0:54f5be781526 1181 UPDATE(state->check, put - out, out);
jonathonfletcher 0:54f5be781526 1182 out = left;
jonathonfletcher 0:54f5be781526 1183 if ((
jonathonfletcher 0:54f5be781526 1184 #ifdef GUNZIP
jonathonfletcher 0:54f5be781526 1185 state->flags ? hold :
jonathonfletcher 0:54f5be781526 1186 #endif
jonathonfletcher 0:54f5be781526 1187 ZSWAP32(hold)) != state->check) {
jonathonfletcher 0:54f5be781526 1188 strm->msg = (char *)"incorrect data check";
jonathonfletcher 0:54f5be781526 1189 state->mode = BAD;
jonathonfletcher 0:54f5be781526 1190 break;
jonathonfletcher 0:54f5be781526 1191 }
jonathonfletcher 0:54f5be781526 1192 INITBITS();
jonathonfletcher 0:54f5be781526 1193 Tracev((stderr, "inflate: check matches trailer\n"));
jonathonfletcher 0:54f5be781526 1194 }
jonathonfletcher 0:54f5be781526 1195 #ifdef GUNZIP
jonathonfletcher 0:54f5be781526 1196 state->mode = LENGTH;
jonathonfletcher 0:54f5be781526 1197 case LENGTH:
jonathonfletcher 0:54f5be781526 1198 if (state->wrap && state->flags) {
jonathonfletcher 0:54f5be781526 1199 NEEDBITS(32);
jonathonfletcher 0:54f5be781526 1200 if (hold != (state->total & 0xffffffffUL)) {
jonathonfletcher 0:54f5be781526 1201 strm->msg = (char *)"incorrect length check";
jonathonfletcher 0:54f5be781526 1202 state->mode = BAD;
jonathonfletcher 0:54f5be781526 1203 break;
jonathonfletcher 0:54f5be781526 1204 }
jonathonfletcher 0:54f5be781526 1205 INITBITS();
jonathonfletcher 0:54f5be781526 1206 Tracev((stderr, "inflate: length matches trailer\n"));
jonathonfletcher 0:54f5be781526 1207 }
jonathonfletcher 0:54f5be781526 1208 #endif
jonathonfletcher 0:54f5be781526 1209 state->mode = DONE;
jonathonfletcher 0:54f5be781526 1210 case DONE:
jonathonfletcher 0:54f5be781526 1211 ret = Z_STREAM_END;
jonathonfletcher 0:54f5be781526 1212 goto inf_leave;
jonathonfletcher 0:54f5be781526 1213 case BAD:
jonathonfletcher 0:54f5be781526 1214 ret = Z_DATA_ERROR;
jonathonfletcher 0:54f5be781526 1215 goto inf_leave;
jonathonfletcher 0:54f5be781526 1216 case MEM:
jonathonfletcher 0:54f5be781526 1217 return Z_MEM_ERROR;
jonathonfletcher 0:54f5be781526 1218 case SYNC:
jonathonfletcher 0:54f5be781526 1219 default:
jonathonfletcher 0:54f5be781526 1220 return Z_STREAM_ERROR;
jonathonfletcher 0:54f5be781526 1221 }
jonathonfletcher 0:54f5be781526 1222
jonathonfletcher 0:54f5be781526 1223 /*
jonathonfletcher 0:54f5be781526 1224 Return from inflate(), updating the total counts and the check value.
jonathonfletcher 0:54f5be781526 1225 If there was no progress during the inflate() call, return a buffer
jonathonfletcher 0:54f5be781526 1226 error. Call updatewindow() to create and/or update the window state.
jonathonfletcher 0:54f5be781526 1227 Note: a memory error from inflate() is non-recoverable.
jonathonfletcher 0:54f5be781526 1228 */
jonathonfletcher 0:54f5be781526 1229 inf_leave:
jonathonfletcher 0:54f5be781526 1230 RESTORE();
jonathonfletcher 0:54f5be781526 1231 if (state->wsize || (out != strm->avail_out && state->mode < BAD &&
jonathonfletcher 0:54f5be781526 1232 (state->mode < CHECK || flush != Z_FINISH)))
jonathonfletcher 0:54f5be781526 1233 if (updatewindow(strm, out)) {
jonathonfletcher 0:54f5be781526 1234 state->mode = MEM;
jonathonfletcher 0:54f5be781526 1235 return Z_MEM_ERROR;
jonathonfletcher 0:54f5be781526 1236 }
jonathonfletcher 0:54f5be781526 1237 in -= strm->avail_in;
jonathonfletcher 0:54f5be781526 1238 out -= strm->avail_out;
jonathonfletcher 0:54f5be781526 1239 strm->total_in += in;
jonathonfletcher 0:54f5be781526 1240 strm->total_out += out;
jonathonfletcher 0:54f5be781526 1241 state->total += out;
jonathonfletcher 0:54f5be781526 1242 if (state->wrap && out)
jonathonfletcher 0:54f5be781526 1243 strm->adler = state->check =
jonathonfletcher 0:54f5be781526 1244 UPDATE(state->check, strm->next_out - out, out);
jonathonfletcher 0:54f5be781526 1245 strm->data_type = state->bits + (state->last ? 64 : 0) +
jonathonfletcher 0:54f5be781526 1246 (state->mode == TYPE ? 128 : 0) +
jonathonfletcher 0:54f5be781526 1247 (state->mode == LEN_ || state->mode == COPY_ ? 256 : 0);
jonathonfletcher 0:54f5be781526 1248 if (((in == 0 && out == 0) || flush == Z_FINISH) && ret == Z_OK)
jonathonfletcher 0:54f5be781526 1249 ret = Z_BUF_ERROR;
jonathonfletcher 0:54f5be781526 1250 return ret;
jonathonfletcher 0:54f5be781526 1251 }
jonathonfletcher 0:54f5be781526 1252
jonathonfletcher 0:54f5be781526 1253 int ZEXPORT inflateEnd(strm)
jonathonfletcher 0:54f5be781526 1254 z_streamp strm;
jonathonfletcher 0:54f5be781526 1255 {
jonathonfletcher 0:54f5be781526 1256 struct inflate_state FAR *state;
jonathonfletcher 0:54f5be781526 1257 if (strm == Z_NULL || strm->state == Z_NULL || strm->zfree == (free_func)0)
jonathonfletcher 0:54f5be781526 1258 return Z_STREAM_ERROR;
jonathonfletcher 0:54f5be781526 1259 state = (struct inflate_state FAR *)strm->state;
jonathonfletcher 0:54f5be781526 1260 if (state->window != Z_NULL) ZFREE(strm, state->window);
jonathonfletcher 0:54f5be781526 1261 ZFREE(strm, strm->state);
jonathonfletcher 0:54f5be781526 1262 strm->state = Z_NULL;
jonathonfletcher 0:54f5be781526 1263 Tracev((stderr, "inflate: end\n"));
jonathonfletcher 0:54f5be781526 1264 return Z_OK;
jonathonfletcher 0:54f5be781526 1265 }
jonathonfletcher 0:54f5be781526 1266
jonathonfletcher 0:54f5be781526 1267 int ZEXPORT inflateSetDictionary(strm, dictionary, dictLength)
jonathonfletcher 0:54f5be781526 1268 z_streamp strm;
jonathonfletcher 0:54f5be781526 1269 const Bytef *dictionary;
jonathonfletcher 0:54f5be781526 1270 uInt dictLength;
jonathonfletcher 0:54f5be781526 1271 {
jonathonfletcher 0:54f5be781526 1272 struct inflate_state FAR *state;
jonathonfletcher 0:54f5be781526 1273 unsigned long dictid;
jonathonfletcher 0:54f5be781526 1274 unsigned char *next;
jonathonfletcher 0:54f5be781526 1275 unsigned avail;
jonathonfletcher 0:54f5be781526 1276 int ret;
jonathonfletcher 0:54f5be781526 1277
jonathonfletcher 0:54f5be781526 1278 /* check state */
jonathonfletcher 0:54f5be781526 1279 if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR;
jonathonfletcher 0:54f5be781526 1280 state = (struct inflate_state FAR *)strm->state;
jonathonfletcher 0:54f5be781526 1281 if (state->wrap != 0 && state->mode != DICT)
jonathonfletcher 0:54f5be781526 1282 return Z_STREAM_ERROR;
jonathonfletcher 0:54f5be781526 1283
jonathonfletcher 0:54f5be781526 1284 /* check for correct dictionary identifier */
jonathonfletcher 0:54f5be781526 1285 if (state->mode == DICT) {
jonathonfletcher 0:54f5be781526 1286 dictid = adler32(0L, Z_NULL, 0);
jonathonfletcher 0:54f5be781526 1287 dictid = adler32(dictid, dictionary, dictLength);
jonathonfletcher 0:54f5be781526 1288 if (dictid != state->check)
jonathonfletcher 0:54f5be781526 1289 return Z_DATA_ERROR;
jonathonfletcher 0:54f5be781526 1290 }
jonathonfletcher 0:54f5be781526 1291
jonathonfletcher 0:54f5be781526 1292 /* copy dictionary to window using updatewindow(), which will amend the
jonathonfletcher 0:54f5be781526 1293 existing dictionary if appropriate */
jonathonfletcher 0:54f5be781526 1294 next = strm->next_out;
jonathonfletcher 0:54f5be781526 1295 avail = strm->avail_out;
jonathonfletcher 0:54f5be781526 1296 strm->next_out = (Bytef *)dictionary + dictLength;
jonathonfletcher 0:54f5be781526 1297 strm->avail_out = 0;
jonathonfletcher 0:54f5be781526 1298 ret = updatewindow(strm, dictLength);
jonathonfletcher 0:54f5be781526 1299 strm->avail_out = avail;
jonathonfletcher 0:54f5be781526 1300 strm->next_out = next;
jonathonfletcher 0:54f5be781526 1301 if (ret) {
jonathonfletcher 0:54f5be781526 1302 state->mode = MEM;
jonathonfletcher 0:54f5be781526 1303 return Z_MEM_ERROR;
jonathonfletcher 0:54f5be781526 1304 }
jonathonfletcher 0:54f5be781526 1305 state->havedict = 1;
jonathonfletcher 0:54f5be781526 1306 Tracev((stderr, "inflate: dictionary set\n"));
jonathonfletcher 0:54f5be781526 1307 return Z_OK;
jonathonfletcher 0:54f5be781526 1308 }
jonathonfletcher 0:54f5be781526 1309
jonathonfletcher 0:54f5be781526 1310 int ZEXPORT inflateGetHeader(strm, head)
jonathonfletcher 0:54f5be781526 1311 z_streamp strm;
jonathonfletcher 0:54f5be781526 1312 gz_headerp head;
jonathonfletcher 0:54f5be781526 1313 {
jonathonfletcher 0:54f5be781526 1314 struct inflate_state FAR *state;
jonathonfletcher 0:54f5be781526 1315
jonathonfletcher 0:54f5be781526 1316 /* check state */
jonathonfletcher 0:54f5be781526 1317 if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR;
jonathonfletcher 0:54f5be781526 1318 state = (struct inflate_state FAR *)strm->state;
jonathonfletcher 0:54f5be781526 1319 if ((state->wrap & 2) == 0) return Z_STREAM_ERROR;
jonathonfletcher 0:54f5be781526 1320
jonathonfletcher 0:54f5be781526 1321 /* save header structure */
jonathonfletcher 0:54f5be781526 1322 state->head = head;
jonathonfletcher 0:54f5be781526 1323 head->done = 0;
jonathonfletcher 0:54f5be781526 1324 return Z_OK;
jonathonfletcher 0:54f5be781526 1325 }
jonathonfletcher 0:54f5be781526 1326
jonathonfletcher 0:54f5be781526 1327 /*
jonathonfletcher 0:54f5be781526 1328 Search buf[0..len-1] for the pattern: 0, 0, 0xff, 0xff. Return when found
jonathonfletcher 0:54f5be781526 1329 or when out of input. When called, *have is the number of pattern bytes
jonathonfletcher 0:54f5be781526 1330 found in order so far, in 0..3. On return *have is updated to the new
jonathonfletcher 0:54f5be781526 1331 state. If on return *have equals four, then the pattern was found and the
jonathonfletcher 0:54f5be781526 1332 return value is how many bytes were read including the last byte of the
jonathonfletcher 0:54f5be781526 1333 pattern. If *have is less than four, then the pattern has not been found
jonathonfletcher 0:54f5be781526 1334 yet and the return value is len. In the latter case, syncsearch() can be
jonathonfletcher 0:54f5be781526 1335 called again with more data and the *have state. *have is initialized to
jonathonfletcher 0:54f5be781526 1336 zero for the first call.
jonathonfletcher 0:54f5be781526 1337 */
jonathonfletcher 0:54f5be781526 1338 local unsigned syncsearch(have, buf, len)
jonathonfletcher 0:54f5be781526 1339 unsigned FAR *have;
jonathonfletcher 0:54f5be781526 1340 unsigned char FAR *buf;
jonathonfletcher 0:54f5be781526 1341 unsigned len;
jonathonfletcher 0:54f5be781526 1342 {
jonathonfletcher 0:54f5be781526 1343 unsigned got;
jonathonfletcher 0:54f5be781526 1344 unsigned next;
jonathonfletcher 0:54f5be781526 1345
jonathonfletcher 0:54f5be781526 1346 got = *have;
jonathonfletcher 0:54f5be781526 1347 next = 0;
jonathonfletcher 0:54f5be781526 1348 while (next < len && got < 4) {
jonathonfletcher 0:54f5be781526 1349 if ((int)(buf[next]) == (got < 2 ? 0 : 0xff))
jonathonfletcher 0:54f5be781526 1350 got++;
jonathonfletcher 0:54f5be781526 1351 else if (buf[next])
jonathonfletcher 0:54f5be781526 1352 got = 0;
jonathonfletcher 0:54f5be781526 1353 else
jonathonfletcher 0:54f5be781526 1354 got = 4 - got;
jonathonfletcher 0:54f5be781526 1355 next++;
jonathonfletcher 0:54f5be781526 1356 }
jonathonfletcher 0:54f5be781526 1357 *have = got;
jonathonfletcher 0:54f5be781526 1358 return next;
jonathonfletcher 0:54f5be781526 1359 }
jonathonfletcher 0:54f5be781526 1360
jonathonfletcher 0:54f5be781526 1361 int ZEXPORT inflateSync(strm)
jonathonfletcher 0:54f5be781526 1362 z_streamp strm;
jonathonfletcher 0:54f5be781526 1363 {
jonathonfletcher 0:54f5be781526 1364 unsigned len; /* number of bytes to look at or looked at */
jonathonfletcher 0:54f5be781526 1365 unsigned long in, out; /* temporary to save total_in and total_out */
jonathonfletcher 0:54f5be781526 1366 unsigned char buf[4]; /* to restore bit buffer to byte string */
jonathonfletcher 0:54f5be781526 1367 struct inflate_state FAR *state;
jonathonfletcher 0:54f5be781526 1368
jonathonfletcher 0:54f5be781526 1369 /* check parameters */
jonathonfletcher 0:54f5be781526 1370 if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR;
jonathonfletcher 0:54f5be781526 1371 state = (struct inflate_state FAR *)strm->state;
jonathonfletcher 0:54f5be781526 1372 if (strm->avail_in == 0 && state->bits < 8) return Z_BUF_ERROR;
jonathonfletcher 0:54f5be781526 1373
jonathonfletcher 0:54f5be781526 1374 /* if first time, start search in bit buffer */
jonathonfletcher 0:54f5be781526 1375 if (state->mode != SYNC) {
jonathonfletcher 0:54f5be781526 1376 state->mode = SYNC;
jonathonfletcher 0:54f5be781526 1377 state->hold <<= state->bits & 7;
jonathonfletcher 0:54f5be781526 1378 state->bits -= state->bits & 7;
jonathonfletcher 0:54f5be781526 1379 len = 0;
jonathonfletcher 0:54f5be781526 1380 while (state->bits >= 8) {
jonathonfletcher 0:54f5be781526 1381 buf[len++] = (unsigned char)(state->hold);
jonathonfletcher 0:54f5be781526 1382 state->hold >>= 8;
jonathonfletcher 0:54f5be781526 1383 state->bits -= 8;
jonathonfletcher 0:54f5be781526 1384 }
jonathonfletcher 0:54f5be781526 1385 state->have = 0;
jonathonfletcher 0:54f5be781526 1386 syncsearch(&(state->have), buf, len);
jonathonfletcher 0:54f5be781526 1387 }
jonathonfletcher 0:54f5be781526 1388
jonathonfletcher 0:54f5be781526 1389 /* search available input */
jonathonfletcher 0:54f5be781526 1390 len = syncsearch(&(state->have), strm->next_in, strm->avail_in);
jonathonfletcher 0:54f5be781526 1391 strm->avail_in -= len;
jonathonfletcher 0:54f5be781526 1392 strm->next_in += len;
jonathonfletcher 0:54f5be781526 1393 strm->total_in += len;
jonathonfletcher 0:54f5be781526 1394
jonathonfletcher 0:54f5be781526 1395 /* return no joy or set up to restart inflate() on a new block */
jonathonfletcher 0:54f5be781526 1396 if (state->have != 4) return Z_DATA_ERROR;
jonathonfletcher 0:54f5be781526 1397 in = strm->total_in; out = strm->total_out;
jonathonfletcher 0:54f5be781526 1398 inflateReset(strm);
jonathonfletcher 0:54f5be781526 1399 strm->total_in = in; strm->total_out = out;
jonathonfletcher 0:54f5be781526 1400 state->mode = TYPE;
jonathonfletcher 0:54f5be781526 1401 return Z_OK;
jonathonfletcher 0:54f5be781526 1402 }
jonathonfletcher 0:54f5be781526 1403
jonathonfletcher 0:54f5be781526 1404 /*
jonathonfletcher 0:54f5be781526 1405 Returns true if inflate is currently at the end of a block generated by
jonathonfletcher 0:54f5be781526 1406 Z_SYNC_FLUSH or Z_FULL_FLUSH. This function is used by one PPP
jonathonfletcher 0:54f5be781526 1407 implementation to provide an additional safety check. PPP uses
jonathonfletcher 0:54f5be781526 1408 Z_SYNC_FLUSH but removes the length bytes of the resulting empty stored
jonathonfletcher 0:54f5be781526 1409 block. When decompressing, PPP checks that at the end of input packet,
jonathonfletcher 0:54f5be781526 1410 inflate is waiting for these length bytes.
jonathonfletcher 0:54f5be781526 1411 */
jonathonfletcher 0:54f5be781526 1412 int ZEXPORT inflateSyncPoint(strm)
jonathonfletcher 0:54f5be781526 1413 z_streamp strm;
jonathonfletcher 0:54f5be781526 1414 {
jonathonfletcher 0:54f5be781526 1415 struct inflate_state FAR *state;
jonathonfletcher 0:54f5be781526 1416
jonathonfletcher 0:54f5be781526 1417 if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR;
jonathonfletcher 0:54f5be781526 1418 state = (struct inflate_state FAR *)strm->state;
jonathonfletcher 0:54f5be781526 1419 return state->mode == STORED && state->bits == 0;
jonathonfletcher 0:54f5be781526 1420 }
jonathonfletcher 0:54f5be781526 1421
jonathonfletcher 0:54f5be781526 1422 int ZEXPORT inflateCopy(dest, source)
jonathonfletcher 0:54f5be781526 1423 z_streamp dest;
jonathonfletcher 0:54f5be781526 1424 z_streamp source;
jonathonfletcher 0:54f5be781526 1425 {
jonathonfletcher 0:54f5be781526 1426 struct inflate_state FAR *state;
jonathonfletcher 0:54f5be781526 1427 struct inflate_state FAR *copy;
jonathonfletcher 0:54f5be781526 1428 unsigned char FAR *window;
jonathonfletcher 0:54f5be781526 1429 unsigned wsize;
jonathonfletcher 0:54f5be781526 1430
jonathonfletcher 0:54f5be781526 1431 /* check input */
jonathonfletcher 0:54f5be781526 1432 if (dest == Z_NULL || source == Z_NULL || source->state == Z_NULL ||
jonathonfletcher 0:54f5be781526 1433 source->zalloc == (alloc_func)0 || source->zfree == (free_func)0)
jonathonfletcher 0:54f5be781526 1434 return Z_STREAM_ERROR;
jonathonfletcher 0:54f5be781526 1435 state = (struct inflate_state FAR *)source->state;
jonathonfletcher 0:54f5be781526 1436
jonathonfletcher 0:54f5be781526 1437 /* allocate space */
jonathonfletcher 0:54f5be781526 1438 copy = (struct inflate_state FAR *)
jonathonfletcher 0:54f5be781526 1439 ZALLOC(source, 1, sizeof(struct inflate_state));
jonathonfletcher 0:54f5be781526 1440 if (copy == Z_NULL) return Z_MEM_ERROR;
jonathonfletcher 0:54f5be781526 1441 window = Z_NULL;
jonathonfletcher 0:54f5be781526 1442 if (state->window != Z_NULL) {
jonathonfletcher 0:54f5be781526 1443 window = (unsigned char FAR *)
jonathonfletcher 0:54f5be781526 1444 ZALLOC(source, 1U << state->wbits, sizeof(unsigned char));
jonathonfletcher 0:54f5be781526 1445 if (window == Z_NULL) {
jonathonfletcher 0:54f5be781526 1446 ZFREE(source, copy);
jonathonfletcher 0:54f5be781526 1447 return Z_MEM_ERROR;
jonathonfletcher 0:54f5be781526 1448 }
jonathonfletcher 0:54f5be781526 1449 }
jonathonfletcher 0:54f5be781526 1450
jonathonfletcher 0:54f5be781526 1451 /* copy state */
jonathonfletcher 0:54f5be781526 1452 zmemcpy((voidpf)dest, (voidpf)source, sizeof(z_stream));
jonathonfletcher 0:54f5be781526 1453 zmemcpy((voidpf)copy, (voidpf)state, sizeof(struct inflate_state));
jonathonfletcher 0:54f5be781526 1454 if (state->lencode >= state->codes &&
jonathonfletcher 0:54f5be781526 1455 state->lencode <= state->codes + ENOUGH - 1) {
jonathonfletcher 0:54f5be781526 1456 copy->lencode = copy->codes + (state->lencode - state->codes);
jonathonfletcher 0:54f5be781526 1457 copy->distcode = copy->codes + (state->distcode - state->codes);
jonathonfletcher 0:54f5be781526 1458 }
jonathonfletcher 0:54f5be781526 1459 copy->next = copy->codes + (state->next - state->codes);
jonathonfletcher 0:54f5be781526 1460 if (window != Z_NULL) {
jonathonfletcher 0:54f5be781526 1461 wsize = 1U << state->wbits;
jonathonfletcher 0:54f5be781526 1462 zmemcpy(window, state->window, wsize);
jonathonfletcher 0:54f5be781526 1463 }
jonathonfletcher 0:54f5be781526 1464 copy->window = window;
jonathonfletcher 0:54f5be781526 1465 dest->state = (struct internal_state FAR *)copy;
jonathonfletcher 0:54f5be781526 1466 return Z_OK;
jonathonfletcher 0:54f5be781526 1467 }
jonathonfletcher 0:54f5be781526 1468
jonathonfletcher 0:54f5be781526 1469 int ZEXPORT inflateUndermine(strm, subvert)
jonathonfletcher 0:54f5be781526 1470 z_streamp strm;
jonathonfletcher 0:54f5be781526 1471 int subvert;
jonathonfletcher 0:54f5be781526 1472 {
jonathonfletcher 0:54f5be781526 1473 struct inflate_state FAR *state;
jonathonfletcher 0:54f5be781526 1474
jonathonfletcher 0:54f5be781526 1475 if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR;
jonathonfletcher 0:54f5be781526 1476 state = (struct inflate_state FAR *)strm->state;
jonathonfletcher 0:54f5be781526 1477 state->sane = !subvert;
jonathonfletcher 0:54f5be781526 1478 #ifdef INFLATE_ALLOW_INVALID_DISTANCE_TOOFAR_ARRR
jonathonfletcher 0:54f5be781526 1479 return Z_OK;
jonathonfletcher 0:54f5be781526 1480 #else
jonathonfletcher 0:54f5be781526 1481 state->sane = 1;
jonathonfletcher 0:54f5be781526 1482 return Z_DATA_ERROR;
jonathonfletcher 0:54f5be781526 1483 #endif
jonathonfletcher 0:54f5be781526 1484 }
jonathonfletcher 0:54f5be781526 1485
jonathonfletcher 0:54f5be781526 1486 long ZEXPORT inflateMark(strm)
jonathonfletcher 0:54f5be781526 1487 z_streamp strm;
jonathonfletcher 0:54f5be781526 1488 {
jonathonfletcher 0:54f5be781526 1489 struct inflate_state FAR *state;
jonathonfletcher 0:54f5be781526 1490
jonathonfletcher 0:54f5be781526 1491 if (strm == Z_NULL || strm->state == Z_NULL) return -1L << 16;
jonathonfletcher 0:54f5be781526 1492 state = (struct inflate_state FAR *)strm->state;
jonathonfletcher 0:54f5be781526 1493 return ((long)(state->back) << 16) +
jonathonfletcher 0:54f5be781526 1494 (state->mode == COPY ? state->length :
jonathonfletcher 0:54f5be781526 1495 (state->mode == MATCH ? state->was - state->length : 0));
jonathonfletcher 0:54f5be781526 1496 }