Line | Count | Source (jump to first uncovered line) |
1 | | /* inflate.c -- zlib decompression |
2 | | * Copyright (C) 1995-2016 Mark Adler |
3 | | * For conditions of distribution and use, see copyright notice in zlib.h |
4 | | */ |
5 | | |
6 | | /* |
7 | | * Change history: |
8 | | * |
9 | | * 1.2.beta0 24 Nov 2002 |
10 | | * - First version -- complete rewrite of inflate to simplify code, avoid |
11 | | * creation of window when not needed, minimize use of window when it is |
12 | | * needed, make inffast.c even faster, implement gzip decoding, and to |
13 | | * improve code readability and style over the previous zlib inflate code |
14 | | * |
15 | | * 1.2.beta1 25 Nov 2002 |
16 | | * - Use pointers for available input and output checking in inffast.c |
17 | | * - Remove input and output counters in inffast.c |
18 | | * - Change inffast.c entry and loop from avail_in >= 7 to >= 6 |
19 | | * - Remove unnecessary second byte pull from length extra in inffast.c |
20 | | * - Unroll direct copy to three copies per loop in inffast.c |
21 | | * |
22 | | * 1.2.beta2 4 Dec 2002 |
23 | | * - Change external routine names to reduce potential conflicts |
24 | | * - Correct filename to inffixed.h for fixed tables in inflate.c |
25 | | * - Make hbuf[] unsigned char to match parameter type in inflate.c |
26 | | * - Change strm->next_out[-state->offset] to *(strm->next_out - state->offset) |
27 | | * to avoid negation problem on Alphas (64 bit) in inflate.c |
28 | | * |
29 | | * 1.2.beta3 22 Dec 2002 |
30 | | * - Add comments on state->bits assertion in inffast.c |
31 | | * - Add comments on op field in inftrees.h |
32 | | * - Fix bug in reuse of allocated window after inflateReset() |
33 | | * - Remove bit fields--back to byte structure for speed |
34 | | * - Remove distance extra == 0 check in inflate_fast()--only helps for lengths |
35 | | * - Change post-increments to pre-increments in inflate_fast(), PPC biased? |
36 | | * - Add compile time option, POSTINC, to use post-increments instead (Intel?) |
37 | | * - Make MATCH copy in inflate() much faster for when inflate_fast() not used |
38 | | * - Use local copies of stream next and avail values, as well as local bit |
39 | | * buffer and bit count in inflate()--for speed when inflate_fast() not used |
40 | | * |
41 | | * 1.2.beta4 1 Jan 2003 |
42 | | * - Split ptr - 257 statements in inflate_table() to avoid compiler warnings |
43 | | * - Move a comment on output buffer sizes from inffast.c to inflate.c |
44 | | * - Add comments in inffast.c to introduce the inflate_fast() routine |
45 | | * - Rearrange window copies in inflate_fast() for speed and simplification |
46 | | * - Unroll last copy for window match in inflate_fast() |
47 | | * - Use local copies of window variables in inflate_fast() for speed |
48 | | * - Pull out common wnext == 0 case for speed in inflate_fast() |
49 | | * - Make op and len in inflate_fast() unsigned for consistency |
50 | | * - Add FAR to lcode and dcode declarations in inflate_fast() |
51 | | * - Simplified bad distance check in inflate_fast() |
52 | | * - Added inflateBackInit(), inflateBack(), and inflateBackEnd() in new |
53 | | * source file infback.c to provide a call-back interface to inflate for |
54 | | * programs like gzip and unzip -- uses window as output buffer to avoid |
55 | | * window copying |
56 | | * |
57 | | * 1.2.beta5 1 Jan 2003 |
58 | | * - Improved inflateBack() interface to allow the caller to provide initial |
59 | | * input in strm. |
60 | | * - Fixed stored blocks bug in inflateBack() |
61 | | * |
62 | | * 1.2.beta6 4 Jan 2003 |
63 | | * - Added comments in inffast.c on effectiveness of POSTINC |
64 | | * - Typecasting all around to reduce compiler warnings |
65 | | * - Changed loops from while (1) or do {} while (1) to for (;;), again to |
66 | | * make compilers happy |
67 | | * - Changed type of window in inflateBackInit() to unsigned char * |
68 | | * |
69 | | * 1.2.beta7 27 Jan 2003 |
70 | | * - Changed many types to unsigned or unsigned short to avoid warnings |
71 | | * - Added inflateCopy() function |
72 | | * |
73 | | * 1.2.0 9 Mar 2003 |
74 | | * - Changed inflateBack() interface to provide separate opaque descriptors |
75 | | * for the in() and out() functions |
76 | | * - Changed inflateBack() argument and in_func typedef to swap the length |
77 | | * and buffer address return values for the input function |
78 | | * - Check next_in and next_out for Z_NULL on entry to inflate() |
79 | | * |
80 | | * The history for versions after 1.2.0 are in ChangeLog in zlib distribution. |
81 | | */ |
82 | | |
83 | | #include "zutil.h" |
84 | | #include "inftrees.h" |
85 | | #include "inflate.h" |
86 | | #include "inffast.h" |
87 | | |
88 | | #ifdef MAKEFIXED |
89 | | # ifndef BUILDFIXED |
90 | | # define BUILDFIXED |
91 | | # endif |
92 | | #endif |
93 | | |
94 | | /* function prototypes */ |
95 | | local int inflateStateCheck OF((z_streamp strm)); |
96 | | local void fixedtables OF((struct inflate_state FAR *state)); |
97 | | local int updatewindow OF((z_streamp strm, const unsigned char FAR *end, |
98 | | unsigned copy)); |
99 | | #ifdef BUILDFIXED |
100 | | void makefixed OF((void)); |
101 | | #endif |
102 | | local unsigned syncsearch OF((unsigned FAR *have, const unsigned char FAR *buf, |
103 | | unsigned len)); |
104 | | |
105 | | local int inflateStateCheck(strm) |
106 | | z_streamp strm; |
107 | 73.8k | { |
108 | 73.8k | struct inflate_state FAR *state; |
109 | 73.8k | if (strm == Z_NULL || |
110 | 73.8k | strm->zalloc == (alloc_func)0 || strm->zfree == (free_func)0) |
111 | 0 | return 1; |
112 | 73.8k | state = (struct inflate_state FAR *)strm->state; |
113 | 73.8k | if (state == Z_NULL || state->strm != strm || |
114 | 73.8k | state->mode < HEAD || state->mode > SYNC) |
115 | 0 | return 1; |
116 | 73.8k | return 0; |
117 | 73.8k | } |
118 | | |
119 | | int ZEXPORT inflateResetKeep(strm) |
120 | | z_streamp strm; |
121 | 14.0k | { |
122 | 14.0k | struct inflate_state FAR *state; |
123 | | |
124 | 14.0k | if (inflateStateCheck(strm)) return Z_STREAM_ERROR; |
125 | 14.0k | state = (struct inflate_state FAR *)strm->state; |
126 | 14.0k | strm->total_in = strm->total_out = state->total = 0; |
127 | 14.0k | strm->msg = Z_NULL; |
128 | 14.0k | if (state->wrap) /* to support ill-conceived Java test suite */ |
129 | 14.0k | strm->adler = state->wrap & 1; |
130 | 14.0k | state->mode = HEAD; |
131 | 14.0k | state->last = 0; |
132 | 14.0k | state->havedict = 0; |
133 | 14.0k | state->flags = -1; |
134 | 14.0k | state->dmax = 32768U; |
135 | 14.0k | state->head = Z_NULL; |
136 | 14.0k | state->hold = 0; |
137 | 14.0k | state->bits = 0; |
138 | 14.0k | state->lencode = state->distcode = state->next = state->codes; |
139 | 14.0k | state->sane = 1; |
140 | 14.0k | state->back = -1; |
141 | 14.0k | Tracev((stderr, "inflate: reset\n")); |
142 | 14.0k | return Z_OK; |
143 | 14.0k | } |
144 | | |
145 | | int ZEXPORT inflateReset(strm) |
146 | | z_streamp strm; |
147 | 14.0k | { |
148 | 14.0k | struct inflate_state FAR *state; |
149 | | |
150 | 14.0k | if (inflateStateCheck(strm)) return Z_STREAM_ERROR; |
151 | 14.0k | state = (struct inflate_state FAR *)strm->state; |
152 | 14.0k | state->wsize = 0; |
153 | 14.0k | state->whave = 0; |
154 | 14.0k | state->wnext = 0; |
155 | 14.0k | return inflateResetKeep(strm); |
156 | 14.0k | } |
157 | | |
158 | | int ZEXPORT inflateReset2(strm, windowBits) |
159 | | z_streamp strm; |
160 | | int windowBits; |
161 | 14.0k | { |
162 | 14.0k | int wrap; |
163 | 14.0k | struct inflate_state FAR *state; |
164 | | |
165 | | /* get the state */ |
166 | 14.0k | if (inflateStateCheck(strm)) return Z_STREAM_ERROR; |
167 | 14.0k | state = (struct inflate_state FAR *)strm->state; |
168 | | |
169 | | /* extract wrap request from windowBits parameter */ |
170 | 14.0k | if (windowBits < 0) { |
171 | 0 | wrap = 0; |
172 | 0 | windowBits = -windowBits; |
173 | 0 | } |
174 | 14.0k | else { |
175 | 14.0k | wrap = (windowBits >> 4) + 5; |
176 | 14.0k | #ifdef GUNZIP |
177 | 14.0k | if (windowBits < 48) |
178 | 14.0k | windowBits &= 15; |
179 | 14.0k | #endif |
180 | 14.0k | } |
181 | | |
182 | | /* set number of window bits, free window if different */ |
183 | 14.0k | if (windowBits && (windowBits < 8 || windowBits > 15)) |
184 | 0 | return Z_STREAM_ERROR; |
185 | 14.0k | if (state->window != Z_NULL && state->wbits != (unsigned)windowBits) { |
186 | 0 | ZFREE(strm, state->window); |
187 | 0 | state->window = Z_NULL; |
188 | 0 | } |
189 | | |
190 | | /* update state and reset the rest of it */ |
191 | 14.0k | state->wrap = wrap; |
192 | 14.0k | state->wbits = (unsigned)windowBits; |
193 | 14.0k | return inflateReset(strm); |
194 | 14.0k | } |
195 | | |
196 | | int ZEXPORT inflateInit2_(strm, windowBits, version, stream_size) |
197 | | z_streamp strm; |
198 | | int windowBits; |
199 | | const char *version; |
200 | | int stream_size; |
201 | 14.0k | { |
202 | 14.0k | int ret; |
203 | 14.0k | struct inflate_state FAR *state; |
204 | | |
205 | 14.0k | if (version == Z_NULL || version[0] != ZLIB_VERSION[0] || |
206 | 14.0k | stream_size != (int)(sizeof(z_stream))) |
207 | 0 | return Z_VERSION_ERROR; |
208 | 14.0k | if (strm == Z_NULL) return Z_STREAM_ERROR; |
209 | 14.0k | strm->msg = Z_NULL; /* in case we return an error */ |
210 | 14.0k | if (strm->zalloc == (alloc_func)0) { |
211 | | #ifdef Z_SOLO |
212 | | return Z_STREAM_ERROR; |
213 | | #else |
214 | 14.0k | strm->zalloc = zcalloc; |
215 | 14.0k | strm->opaque = (voidpf)0; |
216 | 14.0k | #endif |
217 | 14.0k | } |
218 | 14.0k | if (strm->zfree == (free_func)0) |
219 | | #ifdef Z_SOLO |
220 | | return Z_STREAM_ERROR; |
221 | | #else |
222 | 14.0k | strm->zfree = zcfree; |
223 | 14.0k | #endif |
224 | 14.0k | state = (struct inflate_state FAR *) |
225 | 14.0k | ZALLOC(strm, 1, sizeof(struct inflate_state)); |
226 | 14.0k | if (state == Z_NULL) return Z_MEM_ERROR; |
227 | 14.0k | Tracev((stderr, "inflate: allocated\n")); |
228 | 14.0k | strm->state = (struct internal_state FAR *)state; |
229 | 14.0k | state->strm = strm; |
230 | 14.0k | state->window = Z_NULL; |
231 | 14.0k | state->mode = HEAD; /* to pass state test in inflateReset2() */ |
232 | 14.0k | ret = inflateReset2(strm, windowBits); |
233 | 14.0k | if (ret != Z_OK) { |
234 | 0 | ZFREE(strm, state); |
235 | 0 | strm->state = Z_NULL; |
236 | 0 | } |
237 | 14.0k | return ret; |
238 | 14.0k | } |
239 | | |
240 | | int ZEXPORT inflateInit_(strm, version, stream_size) |
241 | | z_streamp strm; |
242 | | const char *version; |
243 | | int stream_size; |
244 | 14.0k | { |
245 | 14.0k | return inflateInit2_(strm, DEF_WBITS, version, stream_size); |
246 | 14.0k | } |
247 | | |
248 | | int ZEXPORT inflatePrime(strm, bits, value) |
249 | | z_streamp strm; |
250 | | int bits; |
251 | | int value; |
252 | 0 | { |
253 | 0 | struct inflate_state FAR *state; |
254 | |
|
255 | 0 | if (inflateStateCheck(strm)) return Z_STREAM_ERROR; |
256 | 0 | state = (struct inflate_state FAR *)strm->state; |
257 | 0 | if (bits < 0) { |
258 | 0 | state->hold = 0; |
259 | 0 | state->bits = 0; |
260 | 0 | return Z_OK; |
261 | 0 | } |
262 | 0 | if (bits > 16 || state->bits + (uInt)bits > 32) return Z_STREAM_ERROR; |
263 | 0 | value &= (1L << bits) - 1; |
264 | 0 | state->hold += (unsigned)value << state->bits; |
265 | 0 | state->bits += (uInt)bits; |
266 | 0 | return Z_OK; |
267 | 0 | } |
268 | | |
269 | | /* |
270 | | Return state with length and distance decoding tables and index sizes set to |
271 | | fixed code decoding. Normally this returns fixed tables from inffixed.h. |
272 | | If BUILDFIXED is defined, then instead this routine builds the tables the |
273 | | first time it's called, and returns those tables the first time and |
274 | | thereafter. This reduces the size of the code by about 2K bytes, in |
275 | | exchange for a little execution time. However, BUILDFIXED should not be |
276 | | used for threaded applications, since the rewriting of the tables and virgin |
277 | | may not be thread-safe. |
278 | | */ |
279 | | local void fixedtables(state) |
280 | | struct inflate_state FAR *state; |
281 | 12.2k | { |
282 | | #ifdef BUILDFIXED |
283 | | static int virgin = 1; |
284 | | static code *lenfix, *distfix; |
285 | | static code fixed[544]; |
286 | | |
287 | | /* build fixed huffman tables if first call (may not be thread safe) */ |
288 | | if (virgin) { |
289 | | unsigned sym, bits; |
290 | | static code *next; |
291 | | |
292 | | /* literal/length table */ |
293 | | sym = 0; |
294 | | while (sym < 144) state->lens[sym++] = 8; |
295 | | while (sym < 256) state->lens[sym++] = 9; |
296 | | while (sym < 280) state->lens[sym++] = 7; |
297 | | while (sym < 288) state->lens[sym++] = 8; |
298 | | next = fixed; |
299 | | lenfix = next; |
300 | | bits = 9; |
301 | | inflate_table(LENS, state->lens, 288, &(next), &(bits), state->work); |
302 | | |
303 | | /* distance table */ |
304 | | sym = 0; |
305 | | while (sym < 32) state->lens[sym++] = 5; |
306 | | distfix = next; |
307 | | bits = 5; |
308 | | inflate_table(DISTS, state->lens, 32, &(next), &(bits), state->work); |
309 | | |
310 | | /* do this just once */ |
311 | | virgin = 0; |
312 | | } |
313 | | #else /* !BUILDFIXED */ |
314 | 12.2k | # include "inffixed.h" |
315 | 12.2k | #endif /* BUILDFIXED */ |
316 | 12.2k | state->lencode = lenfix; |
317 | 12.2k | state->lenbits = 9; |
318 | 12.2k | state->distcode = distfix; |
319 | 12.2k | state->distbits = 5; |
320 | 12.2k | } |
321 | | |
322 | | #ifdef MAKEFIXED |
323 | | #include <stdio.h> |
324 | | |
325 | | /* |
326 | | Write out the inffixed.h that is #include'd above. Defining MAKEFIXED also |
327 | | defines BUILDFIXED, so the tables are built on the fly. makefixed() writes |
328 | | those tables to stdout, which would be piped to inffixed.h. A small program |
329 | | can simply call makefixed to do this: |
330 | | |
331 | | void makefixed(void); |
332 | | |
333 | | int main(void) |
334 | | { |
335 | | makefixed(); |
336 | | return 0; |
337 | | } |
338 | | |
339 | | Then that can be linked with zlib built with MAKEFIXED defined and run: |
340 | | |
341 | | a.out > inffixed.h |
342 | | */ |
343 | | void makefixed() |
344 | | { |
345 | | unsigned low, size; |
346 | | struct inflate_state state; |
347 | | |
348 | | fixedtables(&state); |
349 | | puts(" /* inffixed.h -- table for decoding fixed codes"); |
350 | | puts(" * Generated automatically by makefixed()."); |
351 | | puts(" */"); |
352 | | puts(""); |
353 | | puts(" /* WARNING: this file should *not* be used by applications."); |
354 | | puts(" It is part of the implementation of this library and is"); |
355 | | puts(" subject to change. Applications should only use zlib.h."); |
356 | | puts(" */"); |
357 | | puts(""); |
358 | | size = 1U << 9; |
359 | | printf(" static const code lenfix[%u] = {", size); |
360 | | low = 0; |
361 | | for (;;) { |
362 | | if ((low % 7) == 0) printf("\n "); |
363 | | printf("{%u,%u,%d}", (low & 127) == 99 ? 64 : state.lencode[low].op, |
364 | | state.lencode[low].bits, state.lencode[low].val); |
365 | | if (++low == size) break; |
366 | | putchar(','); |
367 | | } |
368 | | puts("\n };"); |
369 | | size = 1U << 5; |
370 | | printf("\n static const code distfix[%u] = {", size); |
371 | | low = 0; |
372 | | for (;;) { |
373 | | if ((low % 6) == 0) printf("\n "); |
374 | | printf("{%u,%u,%d}", state.distcode[low].op, state.distcode[low].bits, |
375 | | state.distcode[low].val); |
376 | | if (++low == size) break; |
377 | | putchar(','); |
378 | | } |
379 | | puts("\n };"); |
380 | | } |
381 | | #endif /* MAKEFIXED */ |
382 | | |
383 | | /* |
384 | | Update the window with the last wsize (normally 32K) bytes written before |
385 | | returning. If window does not exist yet, create it. This is only called |
386 | | when a window is already in use, or when output has been written during this |
387 | | inflate call, but the end of the deflate stream has not been reached yet. |
388 | | It is also called to create a window for dictionary data when a dictionary |
389 | | is loaded. |
390 | | |
391 | | Providing output buffers larger than 32K to inflate() should provide a speed |
392 | | advantage, since only the last 32K of output is copied to the sliding window |
393 | | upon return from inflate(), and since all distances after the first 32K of |
394 | | output will fall in the output data, making match copies simpler and faster. |
395 | | The advantage may be dependent on the size of the processor's data caches. |
396 | | */ |
397 | | local int updatewindow(strm, end, copy) |
398 | | z_streamp strm; |
399 | | const Bytef *end; |
400 | | unsigned copy; |
401 | 5.15k | { |
402 | 5.15k | struct inflate_state FAR *state; |
403 | 5.15k | unsigned dist; |
404 | | |
405 | 5.15k | state = (struct inflate_state FAR *)strm->state; |
406 | | |
407 | | /* if it hasn't been done already, allocate space for the window */ |
408 | 5.15k | if (state->window == Z_NULL) { |
409 | 2.57k | state->window = (unsigned char FAR *) |
410 | 2.57k | ZALLOC(strm, 1U << state->wbits, |
411 | 2.57k | sizeof(unsigned char)); |
412 | 2.57k | if (state->window == Z_NULL) return 1; |
413 | 2.57k | } |
414 | | |
415 | | /* if window not in use yet, initialize */ |
416 | 5.15k | if (state->wsize == 0) { |
417 | 2.57k | state->wsize = 1U << state->wbits; |
418 | 2.57k | state->wnext = 0; |
419 | 2.57k | state->whave = 0; |
420 | 2.57k | } |
421 | | |
422 | | /* copy state->wsize or less output bytes into the circular window */ |
423 | 5.15k | if (copy >= state->wsize) { |
424 | 747 | zmemcpy(state->window, end - state->wsize, state->wsize); |
425 | 747 | state->wnext = 0; |
426 | 747 | state->whave = state->wsize; |
427 | 747 | } |
428 | 4.40k | else { |
429 | 4.40k | dist = state->wsize - state->wnext; |
430 | 4.40k | if (dist > copy) dist = copy; |
431 | 4.40k | zmemcpy(state->window + state->wnext, end - copy, dist); |
432 | 4.40k | copy -= dist; |
433 | 4.40k | if (copy) { |
434 | 0 | zmemcpy(state->window, end - copy, copy); |
435 | 0 | state->wnext = copy; |
436 | 0 | state->whave = state->wsize; |
437 | 0 | } |
438 | 4.40k | else { |
439 | 4.40k | state->wnext += dist; |
440 | 4.40k | if (state->wnext == state->wsize) state->wnext = 0; |
441 | 4.40k | if (state->whave < state->wsize) state->whave += dist; |
442 | 4.40k | } |
443 | 4.40k | } |
444 | 5.15k | return 0; |
445 | 5.15k | } |
446 | | |
447 | | /* Macros for inflate(): */ |
448 | | |
449 | | /* check function to use adler32() for zlib or crc32() for gzip */ |
450 | | #ifdef GUNZIP |
451 | | # define UPDATE(check, buf, len) \ |
452 | 4.82k | (state->flags ? crc32(check, buf, len) : adler32(check, buf, len)) |
453 | | #else |
454 | | # define UPDATE(check, buf, len) adler32(check, buf, len) |
455 | | #endif |
456 | | |
457 | | /* check macros for header crc */ |
458 | | #ifdef GUNZIP |
459 | | # define CRC2(check, word) \ |
460 | 0 | do { \ |
461 | 0 | hbuf[0] = (unsigned char)(word); \ |
462 | 0 | hbuf[1] = (unsigned char)((word) >> 8); \ |
463 | 0 | check = crc32(check, hbuf, 2); \ |
464 | 0 | } while (0) |
465 | | |
466 | | # define CRC4(check, word) \ |
467 | 0 | do { \ |
468 | 0 | hbuf[0] = (unsigned char)(word); \ |
469 | 0 | hbuf[1] = (unsigned char)((word) >> 8); \ |
470 | 0 | hbuf[2] = (unsigned char)((word) >> 16); \ |
471 | 0 | hbuf[3] = (unsigned char)((word) >> 24); \ |
472 | 0 | check = crc32(check, hbuf, 4); \ |
473 | 0 | } while (0) |
474 | | #endif |
475 | | |
476 | | /* Load registers with state in inflate() for speed */ |
477 | | #define LOAD() \ |
478 | 40.7k | do { \ |
479 | 40.7k | put = strm->next_out; \ |
480 | 40.7k | left = strm->avail_out; \ |
481 | 40.7k | next = strm->next_in; \ |
482 | 40.7k | have = strm->avail_in; \ |
483 | 40.7k | hold = state->hold; \ |
484 | 40.7k | bits = state->bits; \ |
485 | 40.7k | } while (0) |
486 | | |
487 | | /* Restore state from registers in inflate() */ |
488 | | #define RESTORE() \ |
489 | 40.7k | do { \ |
490 | 40.7k | strm->next_out = put; \ |
491 | 40.7k | strm->avail_out = left; \ |
492 | 40.7k | strm->next_in = next; \ |
493 | 40.7k | strm->avail_in = have; \ |
494 | 40.7k | state->hold = hold; \ |
495 | 40.7k | state->bits = bits; \ |
496 | 40.7k | } while (0) |
497 | | |
498 | | /* Clear the input bit accumulator */ |
499 | | #define INITBITS() \ |
500 | 13.8k | do { \ |
501 | 13.8k | hold = 0; \ |
502 | 13.8k | bits = 0; \ |
503 | 13.8k | } while (0) |
504 | | |
505 | | /* Get a byte of input into the bit accumulator, or return from inflate() |
506 | | if there is no input available. */ |
507 | | #define PULLBYTE() \ |
508 | 677k | do { \ |
509 | 677k | if (have == 0) goto inf_leave; \ |
510 | 677k | have--; \ |
511 | 671k | hold += (unsigned long)(*next++) << bits; \ |
512 | 671k | bits += 8; \ |
513 | 671k | } while (0) |
514 | | |
515 | | /* Assure that there are at least n bits in the bit accumulator. If there is |
516 | | not enough available input to do that, then return from inflate(). */ |
517 | | #define NEEDBITS(n) \ |
518 | 410k | do { \ |
519 | 651k | while (bits < (unsigned)(n)) \ |
520 | 410k | PULLBYTE(); \ |
521 | 410k | } while (0) |
522 | | |
523 | | /* Return the low n bits of the bit accumulator (n < 16) */ |
524 | | #define BITS(n) \ |
525 | 2.25M | ((unsigned)hold & ((1U << (n)) - 1)) |
526 | | |
527 | | /* Remove n bits from the bit accumulator */ |
528 | | #define DROPBITS(n) \ |
529 | 1.79M | do { \ |
530 | 1.79M | hold >>= (n); \ |
531 | 1.79M | bits -= (unsigned)(n); \ |
532 | 1.79M | } while (0) |
533 | | |
534 | | /* Remove zero to seven bits as needed to go to a byte boundary */ |
535 | | #define BYTEBITS() \ |
536 | 6.36k | do { \ |
537 | 6.36k | hold >>= bits & 7; \ |
538 | 6.36k | bits -= bits & 7; \ |
539 | 6.36k | } while (0) |
540 | | |
541 | | /* |
542 | | inflate() uses a state machine to process as much input data and generate as |
543 | | much output data as possible before returning. The state machine is |
544 | | structured roughly as follows: |
545 | | |
546 | | for (;;) switch (state) { |
547 | | ... |
548 | | case STATEn: |
549 | | if (not enough input data or output space to make progress) |
550 | | return; |
551 | | ... make progress ... |
552 | | state = STATEm; |
553 | | break; |
554 | | ... |
555 | | } |
556 | | |
557 | | so when inflate() is called again, the same case is attempted again, and |
558 | | if the appropriate resources are provided, the machine proceeds to the |
559 | | next state. The NEEDBITS() macro is usually the way the state evaluates |
560 | | whether it can proceed or should return. NEEDBITS() does the return if |
561 | | the requested bits are not available. The typical use of the BITS macros |
562 | | is: |
563 | | |
564 | | NEEDBITS(n); |
565 | | ... do something with BITS(n) ... |
566 | | DROPBITS(n); |
567 | | |
568 | | where NEEDBITS(n) either returns from inflate() if there isn't enough |
569 | | input left to load n bits into the accumulator, or it continues. BITS(n) |
570 | | gives the low n bits in the accumulator. When done, DROPBITS(n) drops |
571 | | the low n bits off the accumulator. INITBITS() clears the accumulator |
572 | | and sets the number of available bits to zero. BYTEBITS() discards just |
573 | | enough bits to put the accumulator on a byte boundary. After BYTEBITS() |
574 | | and a NEEDBITS(8), then BITS(8) would return the next byte in the stream. |
575 | | |
576 | | NEEDBITS(n) uses PULLBYTE() to get an available byte of input, or to return |
577 | | if there is no input available. The decoding of variable length codes uses |
578 | | PULLBYTE() directly in order to pull just enough bytes to decode the next |
579 | | code, and no more. |
580 | | |
581 | | Some states loop until they get enough input, making sure that enough |
582 | | state information is maintained to continue the loop where it left off |
583 | | if NEEDBITS() returns in the loop. For example, want, need, and keep |
584 | | would all have to actually be part of the saved state in case NEEDBITS() |
585 | | returns: |
586 | | |
587 | | case STATEw: |
588 | | while (want < need) { |
589 | | NEEDBITS(n); |
590 | | keep[want++] = BITS(n); |
591 | | DROPBITS(n); |
592 | | } |
593 | | state = STATEx; |
594 | | case STATEx: |
595 | | |
596 | | As shown above, if the next state is also the next case, then the break |
597 | | is omitted. |
598 | | |
599 | | A state may also return if there is not enough output space available to |
600 | | complete that state. Those states are copying stored data, writing a |
601 | | literal byte, and copying a matching string. |
602 | | |
603 | | When returning, a "goto inf_leave" is used to update the total counters, |
604 | | update the check value, and determine whether any progress has been made |
605 | | during that inflate() call in order to return the proper return code. |
606 | | Progress is defined as a change in either strm->avail_in or strm->avail_out. |
607 | | When there is a window, goto inf_leave will update the window with the last |
608 | | output written. If a goto inf_leave occurs in the middle of decompression |
609 | | and there is no window currently, goto inf_leave will create one and copy |
610 | | output to the window for the next call of inflate(). |
611 | | |
612 | | In this implementation, the flush parameter of inflate() only affects the |
613 | | return code (per zlib.h). inflate() always writes as much as possible to |
614 | | strm->next_out, given the space available and the provided input--the effect |
615 | | documented in zlib.h of Z_SYNC_FLUSH. Furthermore, inflate() always defers |
616 | | the allocation of and copying into a sliding window until necessary, which |
617 | | provides the effect documented in zlib.h for Z_FINISH when the entire input |
618 | | stream available. So the only thing the flush parameter actually does is: |
619 | | when flush is set to Z_FINISH, inflate() cannot return Z_OK. Instead it |
620 | | will return Z_BUF_ERROR if it has not reached the end of the stream. |
621 | | */ |
622 | | |
623 | | int ZEXPORT inflate(strm, flush) |
624 | | z_streamp strm; |
625 | | int flush; |
626 | 17.6k | { |
627 | 17.6k | struct inflate_state FAR *state; |
628 | 17.6k | z_const unsigned char FAR *next; /* next input */ |
629 | 17.6k | unsigned char FAR *put; /* next output */ |
630 | 17.6k | unsigned have, left; /* available input and output */ |
631 | 17.6k | unsigned long hold; /* bit buffer */ |
632 | 17.6k | unsigned bits; /* bits in bit buffer */ |
633 | 17.6k | unsigned in, out; /* save starting available input and output */ |
634 | 17.6k | unsigned copy; /* number of stored or match bytes to copy */ |
635 | 17.6k | unsigned char FAR *from; /* where to copy match bytes from */ |
636 | 17.6k | code here; /* current decoding table entry */ |
637 | 17.6k | code last; /* parent table entry */ |
638 | 17.6k | unsigned len; /* length to copy for repeats, bits to drop */ |
639 | 17.6k | int ret; /* return code */ |
640 | 17.6k | #ifdef GUNZIP |
641 | 17.6k | unsigned char hbuf[4]; /* buffer for gzip header crc calculation */ |
642 | 17.6k | #endif |
643 | 17.6k | static const unsigned short order[19] = /* permutation of code lengths */ |
644 | 17.6k | {16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15}; |
645 | | |
646 | 17.6k | if (inflateStateCheck(strm) || strm->next_out == Z_NULL || |
647 | 17.6k | (strm->next_in == Z_NULL && strm->avail_in != 0)) |
648 | 0 | return Z_STREAM_ERROR; |
649 | | |
650 | 17.6k | state = (struct inflate_state FAR *)strm->state; |
651 | 17.6k | if (state->mode == TYPE) state->mode = TYPEDO; /* skip check */ |
652 | 17.6k | LOAD(); |
653 | 17.6k | in = have; |
654 | 17.6k | out = left; |
655 | 17.6k | ret = Z_OK; |
656 | 17.6k | for (;;) |
657 | 162k | switch (state->mode) { |
658 | 14.0k | case HEAD: |
659 | 14.0k | if (state->wrap == 0) { |
660 | 0 | state->mode = TYPEDO; |
661 | 0 | break; |
662 | 0 | } |
663 | 14.0k | NEEDBITS(16); |
664 | 14.0k | #ifdef GUNZIP |
665 | 14.0k | if ((state->wrap & 2) && hold == 0x8b1f) { /* gzip header */ |
666 | 0 | if (state->wbits == 0) |
667 | 0 | state->wbits = 15; |
668 | 0 | state->check = crc32(0L, Z_NULL, 0); |
669 | 0 | CRC2(state->check, hold); |
670 | 0 | INITBITS(); |
671 | 0 | state->mode = FLAGS; |
672 | 0 | break; |
673 | 0 | } |
674 | 14.0k | if (state->head != Z_NULL) |
675 | 0 | state->head->done = -1; |
676 | 14.0k | if (!(state->wrap & 1) || /* check if zlib header allowed */ |
677 | | #else |
678 | | if ( |
679 | | #endif |
680 | 14.0k | ((BITS(8) << 8) + (hold >> 8)) % 31) { |
681 | 5.11k | strm->msg = (char *)"incorrect header check"; |
682 | 5.11k | state->mode = BAD; |
683 | 5.11k | break; |
684 | 5.11k | } |
685 | 8.91k | if (BITS(4) != Z_DEFLATED) { |
686 | 169 | strm->msg = (char *)"unknown compression method"; |
687 | 169 | state->mode = BAD; |
688 | 169 | break; |
689 | 169 | } |
690 | 8.74k | DROPBITS(4); |
691 | 8.74k | len = BITS(4) + 8; |
692 | 8.74k | if (state->wbits == 0) |
693 | 0 | state->wbits = len; |
694 | 8.74k | if (len > 15 || len > state->wbits) { |
695 | 20 | strm->msg = (char *)"invalid window size"; |
696 | 20 | state->mode = BAD; |
697 | 20 | break; |
698 | 20 | } |
699 | 8.72k | state->dmax = 1U << len; |
700 | 8.72k | state->flags = 0; /* indicate zlib header */ |
701 | 8.72k | Tracev((stderr, "inflate: zlib header ok\n")); |
702 | 8.72k | strm->adler = state->check = adler32(0L, Z_NULL, 0); |
703 | 8.72k | state->mode = hold & 0x200 ? DICTID : TYPE; |
704 | 8.72k | INITBITS(); |
705 | 8.72k | break; |
706 | 0 | #ifdef GUNZIP |
707 | 0 | case FLAGS: |
708 | 0 | NEEDBITS(16); |
709 | 0 | state->flags = (int)(hold); |
710 | 0 | if ((state->flags & 0xff) != Z_DEFLATED) { |
711 | 0 | strm->msg = (char *)"unknown compression method"; |
712 | 0 | state->mode = BAD; |
713 | 0 | break; |
714 | 0 | } |
715 | 0 | if (state->flags & 0xe000) { |
716 | 0 | strm->msg = (char *)"unknown header flags set"; |
717 | 0 | state->mode = BAD; |
718 | 0 | break; |
719 | 0 | } |
720 | 0 | if (state->head != Z_NULL) |
721 | 0 | state->head->text = (int)((hold >> 8) & 1); |
722 | 0 | if ((state->flags & 0x0200) && (state->wrap & 4)) |
723 | 0 | CRC2(state->check, hold); |
724 | 0 | INITBITS(); |
725 | 0 | state->mode = TIME; |
726 | 0 | case TIME: |
727 | 0 | NEEDBITS(32); |
728 | 0 | if (state->head != Z_NULL) |
729 | 0 | state->head->time = hold; |
730 | 0 | if ((state->flags & 0x0200) && (state->wrap & 4)) |
731 | 0 | CRC4(state->check, hold); |
732 | 0 | INITBITS(); |
733 | 0 | state->mode = OS; |
734 | 0 | case OS: |
735 | 0 | NEEDBITS(16); |
736 | 0 | if (state->head != Z_NULL) { |
737 | 0 | state->head->xflags = (int)(hold & 0xff); |
738 | 0 | state->head->os = (int)(hold >> 8); |
739 | 0 | } |
740 | 0 | if ((state->flags & 0x0200) && (state->wrap & 4)) |
741 | 0 | CRC2(state->check, hold); |
742 | 0 | INITBITS(); |
743 | 0 | state->mode = EXLEN; |
744 | 0 | case EXLEN: |
745 | 0 | if (state->flags & 0x0400) { |
746 | 0 | NEEDBITS(16); |
747 | 0 | state->length = (unsigned)(hold); |
748 | 0 | if (state->head != Z_NULL) |
749 | 0 | state->head->extra_len = (unsigned)hold; |
750 | 0 | if ((state->flags & 0x0200) && (state->wrap & 4)) |
751 | 0 | CRC2(state->check, hold); |
752 | 0 | INITBITS(); |
753 | 0 | } |
754 | 0 | else if (state->head != Z_NULL) |
755 | 0 | state->head->extra = Z_NULL; |
756 | 0 | state->mode = EXTRA; |
757 | 0 | case EXTRA: |
758 | 0 | if (state->flags & 0x0400) { |
759 | 0 | copy = state->length; |
760 | 0 | if (copy > have) copy = have; |
761 | 0 | if (copy) { |
762 | 0 | if (state->head != Z_NULL && |
763 | 0 | state->head->extra != Z_NULL) { |
764 | 0 | len = state->head->extra_len - state->length; |
765 | 0 | zmemcpy(state->head->extra + len, next, |
766 | 0 | len + copy > state->head->extra_max ? |
767 | 0 | state->head->extra_max - len : copy); |
768 | 0 | } |
769 | 0 | if ((state->flags & 0x0200) && (state->wrap & 4)) |
770 | 0 | state->check = crc32(state->check, next, copy); |
771 | 0 | have -= copy; |
772 | 0 | next += copy; |
773 | 0 | state->length -= copy; |
774 | 0 | } |
775 | 0 | if (state->length) goto inf_leave; |
776 | 0 | } |
777 | 0 | state->length = 0; |
778 | 0 | state->mode = NAME; |
779 | 0 | case NAME: |
780 | 0 | if (state->flags & 0x0800) { |
781 | 0 | if (have == 0) goto inf_leave; |
782 | 0 | copy = 0; |
783 | 0 | do { |
784 | 0 | len = (unsigned)(next[copy++]); |
785 | 0 | if (state->head != Z_NULL && |
786 | 0 | state->head->name != Z_NULL && |
787 | 0 | state->length < state->head->name_max) |
788 | 0 | state->head->name[state->length++] = (Bytef)len; |
789 | 0 | } while (len && copy < have); |
790 | 0 | if ((state->flags & 0x0200) && (state->wrap & 4)) |
791 | 0 | state->check = crc32(state->check, next, copy); |
792 | 0 | have -= copy; |
793 | 0 | next += copy; |
794 | 0 | if (len) goto inf_leave; |
795 | 0 | } |
796 | 0 | else if (state->head != Z_NULL) |
797 | 0 | state->head->name = Z_NULL; |
798 | 0 | state->length = 0; |
799 | 0 | state->mode = COMMENT; |
800 | 0 | case COMMENT: |
801 | 0 | if (state->flags & 0x1000) { |
802 | 0 | if (have == 0) goto inf_leave; |
803 | 0 | copy = 0; |
804 | 0 | do { |
805 | 0 | len = (unsigned)(next[copy++]); |
806 | 0 | if (state->head != Z_NULL && |
807 | 0 | state->head->comment != Z_NULL && |
808 | 0 | state->length < state->head->comm_max) |
809 | 0 | state->head->comment[state->length++] = (Bytef)len; |
810 | 0 | } while (len && copy < have); |
811 | 0 | if ((state->flags & 0x0200) && (state->wrap & 4)) |
812 | 0 | state->check = crc32(state->check, next, copy); |
813 | 0 | have -= copy; |
814 | 0 | next += copy; |
815 | 0 | if (len) goto inf_leave; |
816 | 0 | } |
817 | 0 | else if (state->head != Z_NULL) |
818 | 0 | state->head->comment = Z_NULL; |
819 | 0 | state->mode = HCRC; |
820 | 0 | case HCRC: |
821 | 0 | if (state->flags & 0x0200) { |
822 | 0 | NEEDBITS(16); |
823 | 0 | if ((state->wrap & 4) && hold != (state->check & 0xffff)) { |
824 | 0 | strm->msg = (char *)"header crc mismatch"; |
825 | 0 | state->mode = BAD; |
826 | 0 | break; |
827 | 0 | } |
828 | 0 | INITBITS(); |
829 | 0 | } |
830 | 0 | if (state->head != Z_NULL) { |
831 | 0 | state->head->hcrc = (int)((state->flags >> 9) & 1); |
832 | 0 | state->head->done = 1; |
833 | 0 | } |
834 | 0 | strm->adler = state->check = crc32(0L, Z_NULL, 0); |
835 | 0 | state->mode = TYPE; |
836 | 0 | break; |
837 | 0 | #endif |
838 | 178 | case DICTID: |
839 | 178 | NEEDBITS(32); |
840 | 34 | strm->adler = state->check = ZSWAP32(hold); |
841 | 34 | INITBITS(); |
842 | 34 | state->mode = DICT; |
843 | 34 | case DICT: |
844 | 34 | if (state->havedict == 0) { |
845 | 34 | RESTORE(); |
846 | 34 | return Z_NEED_DICT; |
847 | 34 | } |
848 | 0 | strm->adler = state->check = adler32(0L, Z_NULL, 0); |
849 | 0 | state->mode = TYPE; |
850 | 31.5k | case TYPE: |
851 | 31.5k | if (flush == Z_BLOCK || flush == Z_TREES) goto inf_leave; |
852 | 31.6k | case TYPEDO: |
853 | 31.6k | if (state->last) { |
854 | 436 | BYTEBITS(); |
855 | 436 | state->mode = CHECK; |
856 | 436 | break; |
857 | 436 | } |
858 | 31.1k | NEEDBITS(3); |
859 | 31.1k | state->last = BITS(1); |
860 | 31.1k | DROPBITS(1); |
861 | 31.1k | switch (BITS(2)) { |
862 | 5.72k | case 0: /* stored block */ |
863 | 5.72k | Tracev((stderr, "inflate: stored block%s\n", |
864 | 5.72k | state->last ? " (last)" : "")); |
865 | 5.72k | state->mode = STORED; |
866 | 5.72k | break; |
867 | 12.2k | case 1: /* fixed block */ |
868 | 12.2k | fixedtables(state); |
869 | 12.2k | Tracev((stderr, "inflate: fixed codes block%s\n", |
870 | 12.2k | state->last ? " (last)" : "")); |
871 | 12.2k | state->mode = LEN_; /* decode codes */ |
872 | 12.2k | if (flush == Z_TREES) { |
873 | 0 | DROPBITS(2); |
874 | 0 | goto inf_leave; |
875 | 0 | } |
876 | 12.2k | break; |
877 | 13.0k | case 2: /* dynamic block */ |
878 | 13.0k | Tracev((stderr, "inflate: dynamic codes block%s\n", |
879 | 13.0k | state->last ? " (last)" : "")); |
880 | 13.0k | state->mode = TABLE; |
881 | 13.0k | break; |
882 | 78 | case 3: |
883 | 78 | strm->msg = (char *)"invalid block type"; |
884 | 78 | state->mode = BAD; |
885 | 31.1k | } |
886 | 31.1k | DROPBITS(2); |
887 | 31.1k | break; |
888 | 5.93k | case STORED: |
889 | 5.93k | BYTEBITS(); /* go to byte boundary */ |
890 | 5.93k | NEEDBITS(32); |
891 | 5.52k | if ((hold & 0xffff) != ((hold >> 16) ^ 0xffff)) { |
892 | 436 | strm->msg = (char *)"invalid stored block lengths"; |
893 | 436 | state->mode = BAD; |
894 | 436 | break; |
895 | 436 | } |
896 | 5.08k | state->length = (unsigned)hold & 0xffff; |
897 | 5.08k | Tracev((stderr, "inflate: stored length %u\n", |
898 | 5.08k | state->length)); |
899 | 5.08k | INITBITS(); |
900 | 5.08k | state->mode = COPY_; |
901 | 5.08k | if (flush == Z_TREES) goto inf_leave; |
902 | 5.08k | case COPY_: |
903 | 5.08k | state->mode = COPY; |
904 | 6.98k | case COPY: |
905 | 6.98k | copy = state->length; |
906 | 6.98k | if (copy) { |
907 | 1.99k | if (copy > have) copy = have; |
908 | 1.99k | if (copy > left) copy = left; |
909 | 1.99k | if (copy == 0) goto inf_leave; |
910 | 1.81k | zmemcpy(put, next, copy); |
911 | 1.81k | have -= copy; |
912 | 1.81k | next += copy; |
913 | 1.81k | left -= copy; |
914 | 1.81k | put += copy; |
915 | 1.81k | state->length -= copy; |
916 | 1.81k | break; |
917 | 1.99k | } |
918 | 4.99k | Tracev((stderr, "inflate: stored end\n")); |
919 | 4.99k | state->mode = TYPE; |
920 | 4.99k | break; |
921 | 13.1k | case TABLE: |
922 | 13.1k | NEEDBITS(14); |
923 | 13.0k | state->nlen = BITS(5) + 257; |
924 | 13.0k | DROPBITS(5); |
925 | 13.0k | state->ndist = BITS(5) + 1; |
926 | 13.0k | DROPBITS(5); |
927 | 13.0k | state->ncode = BITS(4) + 4; |
928 | 13.0k | DROPBITS(4); |
929 | 13.0k | #ifndef PKZIP_BUG_WORKAROUND |
930 | 13.0k | if (state->nlen > 286 || state->ndist > 30) { |
931 | 58 | strm->msg = (char *)"too many length or distance symbols"; |
932 | 58 | state->mode = BAD; |
933 | 58 | break; |
934 | 58 | } |
935 | 12.9k | #endif |
936 | 12.9k | Tracev((stderr, "inflate: table sizes ok\n")); |
937 | 12.9k | state->have = 0; |
938 | 12.9k | state->mode = LENLENS; |
939 | 13.0k | case LENLENS: |
940 | 203k | while (state->have < state->ncode) { |
941 | 190k | NEEDBITS(3); |
942 | 190k | state->lens[order[state->have++]] = (unsigned short)BITS(3); |
943 | 190k | DROPBITS(3); |
944 | 190k | } |
945 | 67.6k | while (state->have < 19) |
946 | 54.8k | state->lens[order[state->have++]] = 0; |
947 | 12.8k | state->next = state->codes; |
948 | 12.8k | state->lencode = (const code FAR *)(state->next); |
949 | 12.8k | state->lenbits = 7; |
950 | 12.8k | ret = inflate_table(CODES, state->lens, 19, &(state->next), |
951 | 12.8k | &(state->lenbits), state->work); |
952 | 12.8k | if (ret) { |
953 | 648 | strm->msg = (char *)"invalid code lengths set"; |
954 | 648 | state->mode = BAD; |
955 | 648 | break; |
956 | 648 | } |
957 | 12.2k | Tracev((stderr, "inflate: code lengths ok\n")); |
958 | 12.2k | state->have = 0; |
959 | 12.2k | state->mode = CODELENS; |
960 | 12.9k | case CODELENS: |
961 | 1.31M | while (state->have < state->nlen + state->ndist) { |
962 | 1.69M | for (;;) { |
963 | 1.69M | here = state->lencode[BITS(state->lenbits)]; |
964 | 1.69M | if ((unsigned)(here.bits) <= bits) break; |
965 | 394k | PULLBYTE(); |
966 | 394k | } |
967 | 1.30M | if (here.val < 16) { |
968 | 1.15M | DROPBITS(here.bits); |
969 | 1.15M | state->lens[state->have++] = here.val; |
970 | 1.15M | } |
971 | 147k | else { |
972 | 147k | if (here.val == 16) { |
973 | 60.1k | NEEDBITS(here.bits + 2); |
974 | 60.0k | DROPBITS(here.bits); |
975 | 60.0k | if (state->have == 0) { |
976 | 39 | strm->msg = (char *)"invalid bit length repeat"; |
977 | 39 | state->mode = BAD; |
978 | 39 | break; |
979 | 39 | } |
980 | 60.0k | len = state->lens[state->have - 1]; |
981 | 60.0k | copy = 3 + BITS(2); |
982 | 60.0k | DROPBITS(2); |
983 | 60.0k | } |
984 | 87.2k | else if (here.val == 17) { |
985 | 64.1k | NEEDBITS(here.bits + 3); |
986 | 64.0k | DROPBITS(here.bits); |
987 | 64.0k | len = 0; |
988 | 64.0k | copy = 3 + BITS(3); |
989 | 64.0k | DROPBITS(3); |
990 | 64.0k | } |
991 | 23.0k | else { |
992 | 23.0k | NEEDBITS(here.bits + 7); |
993 | 22.8k | DROPBITS(here.bits); |
994 | 22.8k | len = 0; |
995 | 22.8k | copy = 11 + BITS(7); |
996 | 22.8k | DROPBITS(7); |
997 | 22.8k | } |
998 | 146k | if (state->have + copy > state->nlen + state->ndist) { |
999 | 1.04k | strm->msg = (char *)"invalid bit length repeat"; |
1000 | 1.04k | state->mode = BAD; |
1001 | 1.04k | break; |
1002 | 1.04k | } |
1003 | 2.29M | while (copy--) |
1004 | 2.14M | state->lens[state->have++] = (unsigned short)len; |
1005 | 145k | } |
1006 | 1.30M | } |
1007 | | |
1008 | | /* handle error breaks in while */ |
1009 | 11.4k | if (state->mode == BAD) break; |
1010 | | |
1011 | | /* check for end-of-block code (better have one) */ |
1012 | 10.3k | if (state->lens[256] == 0) { |
1013 | 215 | strm->msg = (char *)"invalid code -- missing end-of-block"; |
1014 | 215 | state->mode = BAD; |
1015 | 215 | break; |
1016 | 215 | } |
1017 | | |
1018 | | /* build code tables -- note: do not change the lenbits or distbits |
1019 | | values here (9 and 6) without reading the comments in inftrees.h |
1020 | | concerning the ENOUGH constants, which depend on those values */ |
1021 | 10.1k | state->next = state->codes; |
1022 | 10.1k | state->lencode = (const code FAR *)(state->next); |
1023 | 10.1k | state->lenbits = 9; |
1024 | 10.1k | ret = inflate_table(LENS, state->lens, state->nlen, &(state->next), |
1025 | 10.1k | &(state->lenbits), state->work); |
1026 | 10.1k | if (ret) { |
1027 | 547 | strm->msg = (char *)"invalid literal/lengths set"; |
1028 | 547 | state->mode = BAD; |
1029 | 547 | break; |
1030 | 547 | } |
1031 | 9.62k | state->distcode = (const code FAR *)(state->next); |
1032 | 9.62k | state->distbits = 6; |
1033 | 9.62k | ret = inflate_table(DISTS, state->lens + state->nlen, state->ndist, |
1034 | 9.62k | &(state->next), &(state->distbits), state->work); |
1035 | 9.62k | if (ret) { |
1036 | 749 | strm->msg = (char *)"invalid distances set"; |
1037 | 749 | state->mode = BAD; |
1038 | 749 | break; |
1039 | 749 | } |
1040 | 8.87k | Tracev((stderr, "inflate: codes ok\n")); |
1041 | 8.87k | state->mode = LEN_; |
1042 | 8.87k | if (flush == Z_TREES) goto inf_leave; |
1043 | 21.1k | case LEN_: |
1044 | 21.1k | state->mode = LEN; |
1045 | 61.6k | case LEN: |
1046 | 61.6k | if (have >= 6 && left >= 258) { |
1047 | 23.1k | RESTORE(); |
1048 | 23.1k | inflate_fast(strm, out); |
1049 | 23.1k | LOAD(); |
1050 | 23.1k | if (state->mode == TYPE) |
1051 | 17.3k | state->back = -1; |
1052 | 23.1k | break; |
1053 | 23.1k | } |
1054 | 38.4k | state->back = 0; |
1055 | 72.9k | for (;;) { |
1056 | 72.9k | here = state->lencode[BITS(state->lenbits)]; |
1057 | 72.9k | if ((unsigned)(here.bits) <= bits) break; |
1058 | 36.7k | PULLBYTE(); |
1059 | 36.7k | } |
1060 | 36.1k | if (here.op && (here.op & 0xf0) == 0) { |
1061 | 394 | last = here; |
1062 | 483 | for (;;) { |
1063 | 483 | here = state->lencode[last.val + |
1064 | 483 | (BITS(last.bits + last.op) >> last.bits)]; |
1065 | 483 | if ((unsigned)(last.bits + here.bits) <= bits) break; |
1066 | 129 | PULLBYTE(); |
1067 | 129 | } |
1068 | 354 | DROPBITS(last.bits); |
1069 | 354 | state->back += last.bits; |
1070 | 354 | } |
1071 | 36.0k | DROPBITS(here.bits); |
1072 | 36.0k | state->back += here.bits; |
1073 | 36.0k | state->length = (unsigned)here.val; |
1074 | 36.0k | if ((int)(here.op) == 0) { |
1075 | 29.9k | Tracevv((stderr, here.val >= 0x20 && here.val < 0x7f ? |
1076 | 29.9k | "inflate: literal '%c'\n" : |
1077 | 29.9k | "inflate: literal 0x%02x\n", here.val)); |
1078 | 29.9k | state->mode = LIT; |
1079 | 29.9k | break; |
1080 | 29.9k | } |
1081 | 6.17k | if (here.op & 32) { |
1082 | 583 | Tracevv((stderr, "inflate: end of block\n")); |
1083 | 583 | state->back = -1; |
1084 | 583 | state->mode = TYPE; |
1085 | 583 | break; |
1086 | 583 | } |
1087 | 5.59k | if (here.op & 64) { |
1088 | 37 | strm->msg = (char *)"invalid literal/length code"; |
1089 | 37 | state->mode = BAD; |
1090 | 37 | break; |
1091 | 37 | } |
1092 | 5.55k | state->extra = (unsigned)(here.op) & 15; |
1093 | 5.55k | state->mode = LENEXT; |
1094 | 5.62k | case LENEXT: |
1095 | 5.62k | if (state->extra) { |
1096 | 3.99k | NEEDBITS(state->extra); |
1097 | 3.85k | state->length += BITS(state->extra); |
1098 | 3.85k | DROPBITS(state->extra); |
1099 | 3.85k | state->back += state->extra; |
1100 | 3.85k | } |
1101 | 5.48k | Tracevv((stderr, "inflate: length %u\n", state->length)); |
1102 | 5.48k | state->was = state->length; |
1103 | 5.48k | state->mode = DIST; |
1104 | 5.64k | case DIST: |
1105 | 8.60k | for (;;) { |
1106 | 8.60k | here = state->distcode[BITS(state->distbits)]; |
1107 | 8.60k | if ((unsigned)(here.bits) <= bits) break; |
1108 | 3.28k | PULLBYTE(); |
1109 | 3.28k | } |
1110 | 5.32k | if ((here.op & 0xf0) == 0) { |
1111 | 9 | last = here; |
1112 | 12 | for (;;) { |
1113 | 12 | here = state->distcode[last.val + |
1114 | 12 | (BITS(last.bits + last.op) >> last.bits)]; |
1115 | 12 | if ((unsigned)(last.bits + here.bits) <= bits) break; |
1116 | 5 | PULLBYTE(); |
1117 | 5 | } |
1118 | 7 | DROPBITS(last.bits); |
1119 | 7 | state->back += last.bits; |
1120 | 7 | } |
1121 | 5.32k | DROPBITS(here.bits); |
1122 | 5.32k | state->back += here.bits; |
1123 | 5.32k | if (here.op & 64) { |
1124 | 120 | strm->msg = (char *)"invalid distance code"; |
1125 | 120 | state->mode = BAD; |
1126 | 120 | break; |
1127 | 120 | } |
1128 | 5.20k | state->offset = (unsigned)here.val; |
1129 | 5.20k | state->extra = (unsigned)(here.op) & 15; |
1130 | 5.20k | state->mode = DISTEXT; |
1131 | 5.34k | case DISTEXT: |
1132 | 5.34k | if (state->extra) { |
1133 | 3.96k | NEEDBITS(state->extra); |
1134 | 3.68k | state->offset += BITS(state->extra); |
1135 | 3.68k | DROPBITS(state->extra); |
1136 | 3.68k | state->back += state->extra; |
1137 | 3.68k | } |
1138 | | #ifdef INFLATE_STRICT |
1139 | | if (state->offset > state->dmax) { |
1140 | | strm->msg = (char *)"invalid distance too far back"; |
1141 | | state->mode = BAD; |
1142 | | break; |
1143 | | } |
1144 | | #endif |
1145 | 5.06k | Tracevv((stderr, "inflate: distance %u\n", state->offset)); |
1146 | 5.06k | state->mode = MATCH; |
1147 | 5.81k | case MATCH: |
1148 | 5.81k | if (left == 0) goto inf_leave; |
1149 | 5.03k | copy = out - left; |
1150 | 5.03k | if (state->offset > copy) { /* copy from window */ |
1151 | 142 | copy = state->offset - copy; |
1152 | 142 | if (copy > state->whave) { |
1153 | 142 | if (state->sane) { |
1154 | 142 | strm->msg = (char *)"invalid distance too far back"; |
1155 | 142 | state->mode = BAD; |
1156 | 142 | break; |
1157 | 142 | } |
1158 | | #ifdef INFLATE_ALLOW_INVALID_DISTANCE_TOOFAR_ARRR |
1159 | | Trace((stderr, "inflate.c too far\n")); |
1160 | | copy -= state->whave; |
1161 | | if (copy > state->length) copy = state->length; |
1162 | | if (copy > left) copy = left; |
1163 | | left -= copy; |
1164 | | state->length -= copy; |
1165 | | do { |
1166 | | *put++ = 0; |
1167 | | } while (--copy); |
1168 | | if (state->length == 0) state->mode = LEN; |
1169 | | break; |
1170 | | #endif |
1171 | 142 | } |
1172 | 0 | if (copy > state->wnext) { |
1173 | 0 | copy -= state->wnext; |
1174 | 0 | from = state->window + (state->wsize - copy); |
1175 | 0 | } |
1176 | 0 | else |
1177 | 0 | from = state->window + (state->wnext - copy); |
1178 | 0 | if (copy > state->length) copy = state->length; |
1179 | 0 | } |
1180 | 4.89k | else { /* copy from output */ |
1181 | 4.89k | from = put - state->offset; |
1182 | 4.89k | copy = state->length; |
1183 | 4.89k | } |
1184 | 4.89k | if (copy > left) copy = left; |
1185 | 4.89k | left -= copy; |
1186 | 4.89k | state->length -= copy; |
1187 | 194k | do { |
1188 | 194k | *put++ = *from++; |
1189 | 194k | } while (--copy); |
1190 | 4.89k | if (state->length == 0) state->mode = LEN; |
1191 | 4.89k | break; |
1192 | 30.0k | case LIT: |
1193 | 30.0k | if (left == 0) goto inf_leave; |
1194 | 29.8k | *put++ = (unsigned char)(state->length); |
1195 | 29.8k | left--; |
1196 | 29.8k | state->mode = LEN; |
1197 | 29.8k | break; |
1198 | 598 | case CHECK: |
1199 | 598 | if (state->wrap) { |
1200 | 598 | NEEDBITS(32); |
1201 | 274 | out -= left; |
1202 | 274 | strm->total_out += out; |
1203 | 274 | state->total += out; |
1204 | 274 | if ((state->wrap & 4) && out) |
1205 | 226 | strm->adler = state->check = |
1206 | 226 | UPDATE(state->check, put - out, out); |
1207 | 274 | out = left; |
1208 | 274 | if ((state->wrap & 4) && ( |
1209 | 274 | #ifdef GUNZIP |
1210 | 274 | state->flags ? hold : |
1211 | 274 | #endif |
1212 | 274 | ZSWAP32(hold)) != state->check) { |
1213 | 257 | strm->msg = (char *)"incorrect data check"; |
1214 | 257 | state->mode = BAD; |
1215 | 257 | break; |
1216 | 257 | } |
1217 | 17 | INITBITS(); |
1218 | 17 | Tracev((stderr, "inflate: check matches trailer\n")); |
1219 | 17 | } |
1220 | 17 | #ifdef GUNZIP |
1221 | 17 | state->mode = LENGTH; |
1222 | 17 | case LENGTH: |
1223 | 17 | if (state->wrap && state->flags) { |
1224 | 0 | NEEDBITS(32); |
1225 | 0 | if ((state->wrap & 4) && hold != (state->total & 0xffffffff)) { |
1226 | 0 | strm->msg = (char *)"incorrect length check"; |
1227 | 0 | state->mode = BAD; |
1228 | 0 | break; |
1229 | 0 | } |
1230 | 0 | INITBITS(); |
1231 | 0 | Tracev((stderr, "inflate: length matches trailer\n")); |
1232 | 0 | } |
1233 | 17 | #endif |
1234 | 17 | state->mode = DONE; |
1235 | 17 | case DONE: |
1236 | 17 | ret = Z_STREAM_END; |
1237 | 17 | goto inf_leave; |
1238 | 10.4k | case BAD: |
1239 | 10.4k | ret = Z_DATA_ERROR; |
1240 | 10.4k | goto inf_leave; |
1241 | 0 | case MEM: |
1242 | 0 | return Z_MEM_ERROR; |
1243 | 0 | case SYNC: |
1244 | 0 | default: |
1245 | 0 | return Z_STREAM_ERROR; |
1246 | 162k | } |
1247 | | |
1248 | | /* |
1249 | | Return from inflate(), updating the total counts and the check value. |
1250 | | If there was no progress during the inflate() call, return a buffer |
1251 | | error. Call updatewindow() to create and/or update the window state. |
1252 | | Note: a memory error from inflate() is non-recoverable. |
1253 | | */ |
1254 | 17.5k | inf_leave: |
1255 | 17.5k | RESTORE(); |
1256 | 17.5k | if (state->wsize || (out != strm->avail_out && state->mode < BAD && |
1257 | 15.0k | (state->mode < CHECK || flush != Z_FINISH))) |
1258 | 5.15k | if (updatewindow(strm, strm->next_out, out - strm->avail_out)) { |
1259 | 0 | state->mode = MEM; |
1260 | 0 | return Z_MEM_ERROR; |
1261 | 0 | } |
1262 | 17.5k | in -= strm->avail_in; |
1263 | 17.5k | out -= strm->avail_out; |
1264 | 17.5k | strm->total_in += in; |
1265 | 17.5k | strm->total_out += out; |
1266 | 17.5k | state->total += out; |
1267 | 17.5k | if ((state->wrap & 4) && out) |
1268 | 4.59k | strm->adler = state->check = |
1269 | 4.59k | UPDATE(state->check, strm->next_out - out, out); |
1270 | 17.5k | strm->data_type = (int)state->bits + (state->last ? 64 : 0) + |
1271 | 17.5k | (state->mode == TYPE ? 128 : 0) + |
1272 | 17.5k | (state->mode == LEN_ || state->mode == COPY_ ? 256 : 0); |
1273 | 17.5k | if (((in == 0 && out == 0) || flush == Z_FINISH) && ret == Z_OK) |
1274 | 3.55k | ret = Z_BUF_ERROR; |
1275 | 17.5k | return ret; |
1276 | 17.5k | } |
1277 | | |
1278 | | int ZEXPORT inflateEnd(strm) |
1279 | | z_streamp strm; |
1280 | 14.0k | { |
1281 | 14.0k | struct inflate_state FAR *state; |
1282 | 14.0k | if (inflateStateCheck(strm)) |
1283 | 0 | return Z_STREAM_ERROR; |
1284 | 14.0k | state = (struct inflate_state FAR *)strm->state; |
1285 | 14.0k | if (state->window != Z_NULL) ZFREE(strm, state->window); |
1286 | 14.0k | ZFREE(strm, strm->state); |
1287 | 14.0k | strm->state = Z_NULL; |
1288 | 14.0k | Tracev((stderr, "inflate: end\n")); |
1289 | 14.0k | return Z_OK; |
1290 | 14.0k | } |
1291 | | |
1292 | | int ZEXPORT inflateGetDictionary(strm, dictionary, dictLength) |
1293 | | z_streamp strm; |
1294 | | Bytef *dictionary; |
1295 | | uInt *dictLength; |
1296 | 0 | { |
1297 | 0 | struct inflate_state FAR *state; |
1298 | | |
1299 | | /* check state */ |
1300 | 0 | if (inflateStateCheck(strm)) return Z_STREAM_ERROR; |
1301 | 0 | state = (struct inflate_state FAR *)strm->state; |
1302 | | |
1303 | | /* copy dictionary */ |
1304 | 0 | if (state->whave && dictionary != Z_NULL) { |
1305 | 0 | zmemcpy(dictionary, state->window + state->wnext, |
1306 | 0 | state->whave - state->wnext); |
1307 | 0 | zmemcpy(dictionary + state->whave - state->wnext, |
1308 | 0 | state->window, state->wnext); |
1309 | 0 | } |
1310 | 0 | if (dictLength != Z_NULL) |
1311 | 0 | *dictLength = state->whave; |
1312 | 0 | return Z_OK; |
1313 | 0 | } |
1314 | | |
1315 | | int ZEXPORT inflateSetDictionary(strm, dictionary, dictLength) |
1316 | | z_streamp strm; |
1317 | | const Bytef *dictionary; |
1318 | | uInt dictLength; |
1319 | 0 | { |
1320 | 0 | struct inflate_state FAR *state; |
1321 | 0 | unsigned long dictid; |
1322 | 0 | int ret; |
1323 | | |
1324 | | /* check state */ |
1325 | 0 | if (inflateStateCheck(strm)) return Z_STREAM_ERROR; |
1326 | 0 | state = (struct inflate_state FAR *)strm->state; |
1327 | 0 | if (state->wrap != 0 && state->mode != DICT) |
1328 | 0 | return Z_STREAM_ERROR; |
1329 | | |
1330 | | /* check for correct dictionary identifier */ |
1331 | 0 | if (state->mode == DICT) { |
1332 | 0 | dictid = adler32(0L, Z_NULL, 0); |
1333 | 0 | dictid = adler32(dictid, dictionary, dictLength); |
1334 | 0 | if (dictid != state->check) |
1335 | 0 | return Z_DATA_ERROR; |
1336 | 0 | } |
1337 | | |
1338 | | /* copy dictionary to window using updatewindow(), which will amend the |
1339 | | existing dictionary if appropriate */ |
1340 | 0 | ret = updatewindow(strm, dictionary + dictLength, dictLength); |
1341 | 0 | if (ret) { |
1342 | 0 | state->mode = MEM; |
1343 | 0 | return Z_MEM_ERROR; |
1344 | 0 | } |
1345 | 0 | state->havedict = 1; |
1346 | 0 | Tracev((stderr, "inflate: dictionary set\n")); |
1347 | 0 | return Z_OK; |
1348 | 0 | } |
1349 | | |
1350 | | int ZEXPORT inflateGetHeader(strm, head) |
1351 | | z_streamp strm; |
1352 | | gz_headerp head; |
1353 | 0 | { |
1354 | 0 | struct inflate_state FAR *state; |
1355 | | |
1356 | | /* check state */ |
1357 | 0 | if (inflateStateCheck(strm)) return Z_STREAM_ERROR; |
1358 | 0 | state = (struct inflate_state FAR *)strm->state; |
1359 | 0 | if ((state->wrap & 2) == 0) return Z_STREAM_ERROR; |
1360 | | |
1361 | | /* save header structure */ |
1362 | 0 | state->head = head; |
1363 | 0 | head->done = 0; |
1364 | 0 | return Z_OK; |
1365 | 0 | } |
1366 | | |
1367 | | /* |
1368 | | Search buf[0..len-1] for the pattern: 0, 0, 0xff, 0xff. Return when found |
1369 | | or when out of input. When called, *have is the number of pattern bytes |
1370 | | found in order so far, in 0..3. On return *have is updated to the new |
1371 | | state. If on return *have equals four, then the pattern was found and the |
1372 | | return value is how many bytes were read including the last byte of the |
1373 | | pattern. If *have is less than four, then the pattern has not been found |
1374 | | yet and the return value is len. In the latter case, syncsearch() can be |
1375 | | called again with more data and the *have state. *have is initialized to |
1376 | | zero for the first call. |
1377 | | */ |
1378 | | local unsigned syncsearch(have, buf, len) |
1379 | | unsigned FAR *have; |
1380 | | const unsigned char FAR *buf; |
1381 | | unsigned len; |
1382 | 0 | { |
1383 | 0 | unsigned got; |
1384 | 0 | unsigned next; |
1385 | |
|
1386 | 0 | got = *have; |
1387 | 0 | next = 0; |
1388 | 0 | while (next < len && got < 4) { |
1389 | 0 | if ((int)(buf[next]) == (got < 2 ? 0 : 0xff)) |
1390 | 0 | got++; |
1391 | 0 | else if (buf[next]) |
1392 | 0 | got = 0; |
1393 | 0 | else |
1394 | 0 | got = 4 - got; |
1395 | 0 | next++; |
1396 | 0 | } |
1397 | 0 | *have = got; |
1398 | 0 | return next; |
1399 | 0 | } |
1400 | | |
1401 | | int ZEXPORT inflateSync(strm) |
1402 | | z_streamp strm; |
1403 | 0 | { |
1404 | 0 | unsigned len; /* number of bytes to look at or looked at */ |
1405 | 0 | int flags; /* temporary to save header status */ |
1406 | 0 | unsigned long in, out; /* temporary to save total_in and total_out */ |
1407 | 0 | unsigned char buf[4]; /* to restore bit buffer to byte string */ |
1408 | 0 | struct inflate_state FAR *state; |
1409 | | |
1410 | | /* check parameters */ |
1411 | 0 | if (inflateStateCheck(strm)) return Z_STREAM_ERROR; |
1412 | 0 | state = (struct inflate_state FAR *)strm->state; |
1413 | 0 | if (strm->avail_in == 0 && state->bits < 8) return Z_BUF_ERROR; |
1414 | | |
1415 | | /* if first time, start search in bit buffer */ |
1416 | 0 | if (state->mode != SYNC) { |
1417 | 0 | state->mode = SYNC; |
1418 | 0 | state->hold <<= state->bits & 7; |
1419 | 0 | state->bits -= state->bits & 7; |
1420 | 0 | len = 0; |
1421 | 0 | while (state->bits >= 8) { |
1422 | 0 | buf[len++] = (unsigned char)(state->hold); |
1423 | 0 | state->hold >>= 8; |
1424 | 0 | state->bits -= 8; |
1425 | 0 | } |
1426 | 0 | state->have = 0; |
1427 | 0 | syncsearch(&(state->have), buf, len); |
1428 | 0 | } |
1429 | | |
1430 | | /* search available input */ |
1431 | 0 | len = syncsearch(&(state->have), strm->next_in, strm->avail_in); |
1432 | 0 | strm->avail_in -= len; |
1433 | 0 | strm->next_in += len; |
1434 | 0 | strm->total_in += len; |
1435 | | |
1436 | | /* return no joy or set up to restart inflate() on a new block */ |
1437 | 0 | if (state->have != 4) return Z_DATA_ERROR; |
1438 | 0 | if (state->flags == -1) |
1439 | 0 | state->wrap = 0; /* if no header yet, treat as raw */ |
1440 | 0 | else |
1441 | 0 | state->wrap &= ~4; /* no point in computing a check value now */ |
1442 | 0 | flags = state->flags; |
1443 | 0 | in = strm->total_in; out = strm->total_out; |
1444 | 0 | inflateReset(strm); |
1445 | 0 | strm->total_in = in; strm->total_out = out; |
1446 | 0 | state->flags = flags; |
1447 | 0 | state->mode = TYPE; |
1448 | 0 | return Z_OK; |
1449 | 0 | } |
1450 | | |
1451 | | /* |
1452 | | Returns true if inflate is currently at the end of a block generated by |
1453 | | Z_SYNC_FLUSH or Z_FULL_FLUSH. This function is used by one PPP |
1454 | | implementation to provide an additional safety check. PPP uses |
1455 | | Z_SYNC_FLUSH but removes the length bytes of the resulting empty stored |
1456 | | block. When decompressing, PPP checks that at the end of input packet, |
1457 | | inflate is waiting for these length bytes. |
1458 | | */ |
1459 | | int ZEXPORT inflateSyncPoint(strm) |
1460 | | z_streamp strm; |
1461 | 0 | { |
1462 | 0 | struct inflate_state FAR *state; |
1463 | |
|
1464 | 0 | if (inflateStateCheck(strm)) return Z_STREAM_ERROR; |
1465 | 0 | state = (struct inflate_state FAR *)strm->state; |
1466 | 0 | return state->mode == STORED && state->bits == 0; |
1467 | 0 | } |
1468 | | |
1469 | | int ZEXPORT inflateCopy(dest, source) |
1470 | | z_streamp dest; |
1471 | | z_streamp source; |
1472 | 0 | { |
1473 | 0 | struct inflate_state FAR *state; |
1474 | 0 | struct inflate_state FAR *copy; |
1475 | 0 | unsigned char FAR *window; |
1476 | 0 | unsigned wsize; |
1477 | | |
1478 | | /* check input */ |
1479 | 0 | if (inflateStateCheck(source) || dest == Z_NULL) |
1480 | 0 | return Z_STREAM_ERROR; |
1481 | 0 | state = (struct inflate_state FAR *)source->state; |
1482 | | |
1483 | | /* allocate space */ |
1484 | 0 | copy = (struct inflate_state FAR *) |
1485 | 0 | ZALLOC(source, 1, sizeof(struct inflate_state)); |
1486 | 0 | if (copy == Z_NULL) return Z_MEM_ERROR; |
1487 | 0 | window = Z_NULL; |
1488 | 0 | if (state->window != Z_NULL) { |
1489 | 0 | window = (unsigned char FAR *) |
1490 | 0 | ZALLOC(source, 1U << state->wbits, sizeof(unsigned char)); |
1491 | 0 | if (window == Z_NULL) { |
1492 | 0 | ZFREE(source, copy); |
1493 | 0 | return Z_MEM_ERROR; |
1494 | 0 | } |
1495 | 0 | } |
1496 | | |
1497 | | /* copy state */ |
1498 | 0 | zmemcpy((voidpf)dest, (voidpf)source, sizeof(z_stream)); |
1499 | 0 | zmemcpy((voidpf)copy, (voidpf)state, sizeof(struct inflate_state)); |
1500 | 0 | copy->strm = dest; |
1501 | 0 | if (state->lencode >= state->codes && |
1502 | 0 | state->lencode <= state->codes + ENOUGH - 1) { |
1503 | 0 | copy->lencode = copy->codes + (state->lencode - state->codes); |
1504 | 0 | copy->distcode = copy->codes + (state->distcode - state->codes); |
1505 | 0 | } |
1506 | 0 | copy->next = copy->codes + (state->next - state->codes); |
1507 | 0 | if (window != Z_NULL) { |
1508 | 0 | wsize = 1U << state->wbits; |
1509 | 0 | zmemcpy(window, state->window, wsize); |
1510 | 0 | } |
1511 | 0 | copy->window = window; |
1512 | 0 | dest->state = (struct internal_state FAR *)copy; |
1513 | 0 | return Z_OK; |
1514 | 0 | } |
1515 | | |
1516 | | int ZEXPORT inflateUndermine(strm, subvert) |
1517 | | z_streamp strm; |
1518 | | int subvert; |
1519 | 0 | { |
1520 | 0 | struct inflate_state FAR *state; |
1521 | |
|
1522 | 0 | if (inflateStateCheck(strm)) return Z_STREAM_ERROR; |
1523 | 0 | state = (struct inflate_state FAR *)strm->state; |
1524 | | #ifdef INFLATE_ALLOW_INVALID_DISTANCE_TOOFAR_ARRR |
1525 | | state->sane = !subvert; |
1526 | | return Z_OK; |
1527 | | #else |
1528 | 0 | (void)subvert; |
1529 | 0 | state->sane = 1; |
1530 | 0 | return Z_DATA_ERROR; |
1531 | 0 | #endif |
1532 | 0 | } |
1533 | | |
1534 | | int ZEXPORT inflateValidate(strm, check) |
1535 | | z_streamp strm; |
1536 | | int check; |
1537 | 0 | { |
1538 | 0 | struct inflate_state FAR *state; |
1539 | |
|
1540 | 0 | if (inflateStateCheck(strm)) return Z_STREAM_ERROR; |
1541 | 0 | state = (struct inflate_state FAR *)strm->state; |
1542 | 0 | if (check && state->wrap) |
1543 | 0 | state->wrap |= 4; |
1544 | 0 | else |
1545 | 0 | state->wrap &= ~4; |
1546 | 0 | return Z_OK; |
1547 | 0 | } |
1548 | | |
1549 | | long ZEXPORT inflateMark(strm) |
1550 | | z_streamp strm; |
1551 | 0 | { |
1552 | 0 | struct inflate_state FAR *state; |
1553 | |
|
1554 | 0 | if (inflateStateCheck(strm)) |
1555 | 0 | return -(1L << 16); |
1556 | 0 | state = (struct inflate_state FAR *)strm->state; |
1557 | 0 | return (long)(((unsigned long)((long)state->back)) << 16) + |
1558 | 0 | (state->mode == COPY ? state->length : |
1559 | 0 | (state->mode == MATCH ? state->was - state->length : 0)); |
1560 | 0 | } |
1561 | | |
1562 | | unsigned long ZEXPORT inflateCodesUsed(strm) |
1563 | | z_streamp strm; |
1564 | 0 | { |
1565 | 0 | struct inflate_state FAR *state; |
1566 | 0 | if (inflateStateCheck(strm)) return (unsigned long)-1; |
1567 | 0 | state = (struct inflate_state FAR *)strm->state; |
1568 | 0 | return (unsigned long)(state->next - state->codes); |
1569 | 0 | } |