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43743d63 | 1 | /* gzlib.c -- zlib functions common to reading and writing gzip files |
b7aa844d | 2 | * Copyright (C) 2004, 2010, 2011, 2012, 2013, 2016 Mark Adler |
43743d63 MK |
3 | * For conditions of distribution and use, see copyright notice in zlib.h |
4 | */ | |
5 | ||
6 | #include "gzguts.h" | |
7 | ||
b7aa844d | 8 | #if defined(_WIN32) && !defined(__BORLANDC__) && !defined(__MINGW32__) |
9acb8ddf MK |
9 | # define LSEEK _lseeki64 |
10 | #else | |
43743d63 MK |
11 | #if defined(_LARGEFILE64_SOURCE) && _LFS64_LARGEFILE-0 |
12 | # define LSEEK lseek64 | |
13 | #else | |
14 | # define LSEEK lseek | |
15 | #endif | |
9acb8ddf | 16 | #endif |
43743d63 MK |
17 | |
18 | /* Local functions */ | |
19 | local void gz_reset OF((gz_statep)); | |
9acb8ddf | 20 | local gzFile gz_open OF((const void *, int, const char *)); |
43743d63 MK |
21 | |
22 | #if defined UNDER_CE | |
23 | ||
24 | /* Map the Windows error number in ERROR to a locale-dependent error message | |
25 | string and return a pointer to it. Typically, the values for ERROR come | |
26 | from GetLastError. | |
27 | ||
28 | The string pointed to shall not be modified by the application, but may be | |
29 | overwritten by a subsequent call to gz_strwinerror | |
30 | ||
31 | The gz_strwinerror function does not change the current setting of | |
32 | GetLastError. */ | |
33 | char ZLIB_INTERNAL *gz_strwinerror (error) | |
34 | DWORD error; | |
35 | { | |
36 | static char buf[1024]; | |
37 | ||
38 | wchar_t *msgbuf; | |
39 | DWORD lasterr = GetLastError(); | |
40 | DWORD chars = FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | |
41 | | FORMAT_MESSAGE_ALLOCATE_BUFFER, | |
42 | NULL, | |
43 | error, | |
44 | 0, /* Default language */ | |
45 | (LPVOID)&msgbuf, | |
46 | 0, | |
47 | NULL); | |
48 | if (chars != 0) { | |
49 | /* If there is an \r\n appended, zap it. */ | |
50 | if (chars >= 2 | |
51 | && msgbuf[chars - 2] == '\r' && msgbuf[chars - 1] == '\n') { | |
52 | chars -= 2; | |
53 | msgbuf[chars] = 0; | |
54 | } | |
55 | ||
56 | if (chars > sizeof (buf) - 1) { | |
57 | chars = sizeof (buf) - 1; | |
58 | msgbuf[chars] = 0; | |
59 | } | |
60 | ||
61 | wcstombs(buf, msgbuf, chars + 1); | |
62 | LocalFree(msgbuf); | |
63 | } | |
64 | else { | |
65 | sprintf(buf, "unknown win32 error (%ld)", error); | |
66 | } | |
67 | ||
68 | SetLastError(lasterr); | |
69 | return buf; | |
70 | } | |
71 | ||
72 | #endif /* UNDER_CE */ | |
73 | ||
74 | /* Reset gzip file state */ | |
75 | local void gz_reset(state) | |
76 | gz_statep state; | |
77 | { | |
9acb8ddf | 78 | state->x.have = 0; /* no output data available */ |
43743d63 | 79 | if (state->mode == GZ_READ) { /* for reading ... */ |
43743d63 | 80 | state->eof = 0; /* not at end of file */ |
9acb8ddf | 81 | state->past = 0; /* have not read past end yet */ |
43743d63 | 82 | state->how = LOOK; /* look for gzip header */ |
43743d63 MK |
83 | } |
84 | state->seek = 0; /* no seek request pending */ | |
85 | gz_error(state, Z_OK, NULL); /* clear error */ | |
9acb8ddf | 86 | state->x.pos = 0; /* no uncompressed data yet */ |
43743d63 MK |
87 | state->strm.avail_in = 0; /* no input data yet */ |
88 | } | |
89 | ||
90 | /* Open a gzip file either by name or file descriptor. */ | |
91 | local gzFile gz_open(path, fd, mode) | |
9acb8ddf | 92 | const void *path; |
43743d63 MK |
93 | int fd; |
94 | const char *mode; | |
95 | { | |
96 | gz_statep state; | |
b7aa844d | 97 | z_size_t len; |
9acb8ddf MK |
98 | int oflag; |
99 | #ifdef O_CLOEXEC | |
100 | int cloexec = 0; | |
101 | #endif | |
102 | #ifdef O_EXCL | |
103 | int exclusive = 0; | |
104 | #endif | |
105 | ||
106 | /* check input */ | |
107 | if (path == NULL) | |
108 | return NULL; | |
43743d63 MK |
109 | |
110 | /* allocate gzFile structure to return */ | |
cd9ec142 | 111 | state = (gz_statep)malloc(sizeof(gz_state)); |
43743d63 MK |
112 | if (state == NULL) |
113 | return NULL; | |
114 | state->size = 0; /* no buffers allocated yet */ | |
115 | state->want = GZBUFSIZE; /* requested buffer size */ | |
116 | state->msg = NULL; /* no error message yet */ | |
117 | ||
118 | /* interpret mode */ | |
119 | state->mode = GZ_NONE; | |
120 | state->level = Z_DEFAULT_COMPRESSION; | |
121 | state->strategy = Z_DEFAULT_STRATEGY; | |
9acb8ddf | 122 | state->direct = 0; |
43743d63 MK |
123 | while (*mode) { |
124 | if (*mode >= '0' && *mode <= '9') | |
125 | state->level = *mode - '0'; | |
126 | else | |
127 | switch (*mode) { | |
128 | case 'r': | |
129 | state->mode = GZ_READ; | |
130 | break; | |
131 | #ifndef NO_GZCOMPRESS | |
132 | case 'w': | |
133 | state->mode = GZ_WRITE; | |
134 | break; | |
135 | case 'a': | |
136 | state->mode = GZ_APPEND; | |
137 | break; | |
138 | #endif | |
139 | case '+': /* can't read and write at the same time */ | |
140 | free(state); | |
141 | return NULL; | |
142 | case 'b': /* ignore -- will request binary anyway */ | |
143 | break; | |
9acb8ddf MK |
144 | #ifdef O_CLOEXEC |
145 | case 'e': | |
146 | cloexec = 1; | |
147 | break; | |
148 | #endif | |
149 | #ifdef O_EXCL | |
150 | case 'x': | |
151 | exclusive = 1; | |
152 | break; | |
153 | #endif | |
43743d63 MK |
154 | case 'f': |
155 | state->strategy = Z_FILTERED; | |
156 | break; | |
157 | case 'h': | |
158 | state->strategy = Z_HUFFMAN_ONLY; | |
159 | break; | |
160 | case 'R': | |
161 | state->strategy = Z_RLE; | |
162 | break; | |
163 | case 'F': | |
164 | state->strategy = Z_FIXED; | |
cd9ec142 | 165 | break; |
9acb8ddf MK |
166 | case 'T': |
167 | state->direct = 1; | |
cd9ec142 | 168 | break; |
43743d63 MK |
169 | default: /* could consider as an error, but just ignore */ |
170 | ; | |
171 | } | |
172 | mode++; | |
173 | } | |
174 | ||
175 | /* must provide an "r", "w", or "a" */ | |
176 | if (state->mode == GZ_NONE) { | |
177 | free(state); | |
178 | return NULL; | |
179 | } | |
180 | ||
9acb8ddf MK |
181 | /* can't force transparent read */ |
182 | if (state->mode == GZ_READ) { | |
183 | if (state->direct) { | |
184 | free(state); | |
185 | return NULL; | |
186 | } | |
187 | state->direct = 1; /* for empty file */ | |
188 | } | |
189 | ||
43743d63 | 190 | /* save the path name for error messages */ |
b7aa844d | 191 | #ifdef WIDECHAR |
9acb8ddf MK |
192 | if (fd == -2) { |
193 | len = wcstombs(NULL, path, 0); | |
b7aa844d | 194 | if (len == (z_size_t)-1) |
9acb8ddf MK |
195 | len = 0; |
196 | } | |
197 | else | |
198 | #endif | |
cd9ec142 MK |
199 | len = strlen((const char *)path); |
200 | state->path = (char *)malloc(len + 1); | |
43743d63 MK |
201 | if (state->path == NULL) { |
202 | free(state); | |
203 | return NULL; | |
204 | } | |
b7aa844d | 205 | #ifdef WIDECHAR |
9acb8ddf MK |
206 | if (fd == -2) |
207 | if (len) | |
208 | wcstombs(state->path, path, len + 1); | |
209 | else | |
210 | *(state->path) = 0; | |
211 | else | |
212 | #endif | |
cd9ec142 | 213 | #if !defined(NO_snprintf) && !defined(NO_vsnprintf) |
b7aa844d | 214 | (void)snprintf(state->path, len + 1, "%s", (const char *)path); |
cd9ec142 | 215 | #else |
9acb8ddf | 216 | strcpy(state->path, path); |
cd9ec142 | 217 | #endif |
43743d63 | 218 | |
9acb8ddf MK |
219 | /* compute the flags for open() */ |
220 | oflag = | |
43743d63 | 221 | #ifdef O_LARGEFILE |
9acb8ddf | 222 | O_LARGEFILE | |
43743d63 MK |
223 | #endif |
224 | #ifdef O_BINARY | |
9acb8ddf MK |
225 | O_BINARY | |
226 | #endif | |
227 | #ifdef O_CLOEXEC | |
228 | (cloexec ? O_CLOEXEC : 0) | | |
43743d63 | 229 | #endif |
9acb8ddf MK |
230 | (state->mode == GZ_READ ? |
231 | O_RDONLY : | |
232 | (O_WRONLY | O_CREAT | | |
233 | #ifdef O_EXCL | |
234 | (exclusive ? O_EXCL : 0) | | |
235 | #endif | |
236 | (state->mode == GZ_WRITE ? | |
237 | O_TRUNC : | |
238 | O_APPEND))); | |
239 | ||
240 | /* open the file with the appropriate flags (or just use fd) */ | |
241 | state->fd = fd > -1 ? fd : ( | |
b7aa844d | 242 | #ifdef WIDECHAR |
9acb8ddf MK |
243 | fd == -2 ? _wopen(path, oflag, 0666) : |
244 | #endif | |
cd9ec142 | 245 | open((const char *)path, oflag, 0666)); |
43743d63 MK |
246 | if (state->fd == -1) { |
247 | free(state->path); | |
248 | free(state); | |
249 | return NULL; | |
250 | } | |
b7aa844d MK |
251 | if (state->mode == GZ_APPEND) { |
252 | LSEEK(state->fd, 0, SEEK_END); /* so gzoffset() is correct */ | |
43743d63 | 253 | state->mode = GZ_WRITE; /* simplify later checks */ |
b7aa844d | 254 | } |
43743d63 MK |
255 | |
256 | /* save the current position for rewinding (only if reading) */ | |
257 | if (state->mode == GZ_READ) { | |
258 | state->start = LSEEK(state->fd, 0, SEEK_CUR); | |
259 | if (state->start == -1) state->start = 0; | |
260 | } | |
261 | ||
262 | /* initialize stream */ | |
263 | gz_reset(state); | |
264 | ||
265 | /* return stream */ | |
266 | return (gzFile)state; | |
267 | } | |
268 | ||
269 | /* -- see zlib.h -- */ | |
270 | gzFile ZEXPORT gzopen(path, mode) | |
271 | const char *path; | |
272 | const char *mode; | |
273 | { | |
274 | return gz_open(path, -1, mode); | |
275 | } | |
276 | ||
277 | /* -- see zlib.h -- */ | |
278 | gzFile ZEXPORT gzopen64(path, mode) | |
279 | const char *path; | |
280 | const char *mode; | |
281 | { | |
282 | return gz_open(path, -1, mode); | |
283 | } | |
284 | ||
285 | /* -- see zlib.h -- */ | |
286 | gzFile ZEXPORT gzdopen(fd, mode) | |
287 | int fd; | |
288 | const char *mode; | |
289 | { | |
290 | char *path; /* identifier for error messages */ | |
291 | gzFile gz; | |
292 | ||
cd9ec142 | 293 | if (fd == -1 || (path = (char *)malloc(7 + 3 * sizeof(int))) == NULL) |
43743d63 | 294 | return NULL; |
cd9ec142 | 295 | #if !defined(NO_snprintf) && !defined(NO_vsnprintf) |
b7aa844d | 296 | (void)snprintf(path, 7 + 3 * sizeof(int), "<fd:%d>", fd); |
cd9ec142 | 297 | #else |
43743d63 | 298 | sprintf(path, "<fd:%d>", fd); /* for debugging */ |
cd9ec142 | 299 | #endif |
43743d63 MK |
300 | gz = gz_open(path, fd, mode); |
301 | free(path); | |
302 | return gz; | |
303 | } | |
304 | ||
9acb8ddf | 305 | /* -- see zlib.h -- */ |
b7aa844d | 306 | #ifdef WIDECHAR |
9acb8ddf MK |
307 | gzFile ZEXPORT gzopen_w(path, mode) |
308 | const wchar_t *path; | |
309 | const char *mode; | |
310 | { | |
311 | return gz_open(path, -2, mode); | |
312 | } | |
313 | #endif | |
314 | ||
43743d63 MK |
315 | /* -- see zlib.h -- */ |
316 | int ZEXPORT gzbuffer(file, size) | |
317 | gzFile file; | |
318 | unsigned size; | |
319 | { | |
320 | gz_statep state; | |
321 | ||
322 | /* get internal structure and check integrity */ | |
323 | if (file == NULL) | |
324 | return -1; | |
325 | state = (gz_statep)file; | |
326 | if (state->mode != GZ_READ && state->mode != GZ_WRITE) | |
327 | return -1; | |
328 | ||
329 | /* make sure we haven't already allocated memory */ | |
330 | if (state->size != 0) | |
331 | return -1; | |
332 | ||
333 | /* check and set requested size */ | |
b7aa844d MK |
334 | if ((size << 1) < size) |
335 | return -1; /* need to be able to double it */ | |
9acb8ddf MK |
336 | if (size < 2) |
337 | size = 2; /* need two bytes to check magic header */ | |
43743d63 MK |
338 | state->want = size; |
339 | return 0; | |
340 | } | |
341 | ||
342 | /* -- see zlib.h -- */ | |
343 | int ZEXPORT gzrewind(file) | |
344 | gzFile file; | |
345 | { | |
346 | gz_statep state; | |
347 | ||
348 | /* get internal structure */ | |
349 | if (file == NULL) | |
350 | return -1; | |
351 | state = (gz_statep)file; | |
352 | ||
353 | /* check that we're reading and that there's no error */ | |
9acb8ddf MK |
354 | if (state->mode != GZ_READ || |
355 | (state->err != Z_OK && state->err != Z_BUF_ERROR)) | |
43743d63 MK |
356 | return -1; |
357 | ||
358 | /* back up and start over */ | |
359 | if (LSEEK(state->fd, state->start, SEEK_SET) == -1) | |
360 | return -1; | |
361 | gz_reset(state); | |
362 | return 0; | |
363 | } | |
364 | ||
365 | /* -- see zlib.h -- */ | |
366 | z_off64_t ZEXPORT gzseek64(file, offset, whence) | |
367 | gzFile file; | |
368 | z_off64_t offset; | |
369 | int whence; | |
370 | { | |
371 | unsigned n; | |
372 | z_off64_t ret; | |
373 | gz_statep state; | |
374 | ||
375 | /* get internal structure and check integrity */ | |
376 | if (file == NULL) | |
377 | return -1; | |
378 | state = (gz_statep)file; | |
379 | if (state->mode != GZ_READ && state->mode != GZ_WRITE) | |
380 | return -1; | |
381 | ||
382 | /* check that there's no error */ | |
9acb8ddf | 383 | if (state->err != Z_OK && state->err != Z_BUF_ERROR) |
43743d63 MK |
384 | return -1; |
385 | ||
386 | /* can only seek from start or relative to current position */ | |
387 | if (whence != SEEK_SET && whence != SEEK_CUR) | |
388 | return -1; | |
389 | ||
390 | /* normalize offset to a SEEK_CUR specification */ | |
391 | if (whence == SEEK_SET) | |
9acb8ddf | 392 | offset -= state->x.pos; |
43743d63 MK |
393 | else if (state->seek) |
394 | offset += state->skip; | |
395 | state->seek = 0; | |
396 | ||
397 | /* if within raw area while reading, just go there */ | |
398 | if (state->mode == GZ_READ && state->how == COPY && | |
9acb8ddf MK |
399 | state->x.pos + offset >= 0) { |
400 | ret = LSEEK(state->fd, offset - state->x.have, SEEK_CUR); | |
43743d63 MK |
401 | if (ret == -1) |
402 | return -1; | |
9acb8ddf | 403 | state->x.have = 0; |
43743d63 | 404 | state->eof = 0; |
9acb8ddf | 405 | state->past = 0; |
43743d63 MK |
406 | state->seek = 0; |
407 | gz_error(state, Z_OK, NULL); | |
408 | state->strm.avail_in = 0; | |
9acb8ddf MK |
409 | state->x.pos += offset; |
410 | return state->x.pos; | |
43743d63 MK |
411 | } |
412 | ||
413 | /* calculate skip amount, rewinding if needed for back seek when reading */ | |
414 | if (offset < 0) { | |
415 | if (state->mode != GZ_READ) /* writing -- can't go backwards */ | |
416 | return -1; | |
9acb8ddf | 417 | offset += state->x.pos; |
43743d63 MK |
418 | if (offset < 0) /* before start of file! */ |
419 | return -1; | |
420 | if (gzrewind(file) == -1) /* rewind, then skip to offset */ | |
421 | return -1; | |
422 | } | |
423 | ||
424 | /* if reading, skip what's in output buffer (one less gzgetc() check) */ | |
425 | if (state->mode == GZ_READ) { | |
9acb8ddf MK |
426 | n = GT_OFF(state->x.have) || (z_off64_t)state->x.have > offset ? |
427 | (unsigned)offset : state->x.have; | |
428 | state->x.have -= n; | |
429 | state->x.next += n; | |
430 | state->x.pos += n; | |
43743d63 MK |
431 | offset -= n; |
432 | } | |
433 | ||
434 | /* request skip (if not zero) */ | |
435 | if (offset) { | |
436 | state->seek = 1; | |
437 | state->skip = offset; | |
438 | } | |
9acb8ddf | 439 | return state->x.pos + offset; |
43743d63 MK |
440 | } |
441 | ||
442 | /* -- see zlib.h -- */ | |
443 | z_off_t ZEXPORT gzseek(file, offset, whence) | |
444 | gzFile file; | |
445 | z_off_t offset; | |
446 | int whence; | |
447 | { | |
448 | z_off64_t ret; | |
449 | ||
450 | ret = gzseek64(file, (z_off64_t)offset, whence); | |
451 | return ret == (z_off_t)ret ? (z_off_t)ret : -1; | |
452 | } | |
453 | ||
454 | /* -- see zlib.h -- */ | |
455 | z_off64_t ZEXPORT gztell64(file) | |
456 | gzFile file; | |
457 | { | |
458 | gz_statep state; | |
459 | ||
460 | /* get internal structure and check integrity */ | |
461 | if (file == NULL) | |
462 | return -1; | |
463 | state = (gz_statep)file; | |
464 | if (state->mode != GZ_READ && state->mode != GZ_WRITE) | |
465 | return -1; | |
466 | ||
467 | /* return position */ | |
9acb8ddf | 468 | return state->x.pos + (state->seek ? state->skip : 0); |
43743d63 MK |
469 | } |
470 | ||
471 | /* -- see zlib.h -- */ | |
472 | z_off_t ZEXPORT gztell(file) | |
473 | gzFile file; | |
474 | { | |
475 | z_off64_t ret; | |
476 | ||
477 | ret = gztell64(file); | |
478 | return ret == (z_off_t)ret ? (z_off_t)ret : -1; | |
479 | } | |
480 | ||
481 | /* -- see zlib.h -- */ | |
482 | z_off64_t ZEXPORT gzoffset64(file) | |
483 | gzFile file; | |
484 | { | |
485 | z_off64_t offset; | |
486 | gz_statep state; | |
487 | ||
488 | /* get internal structure and check integrity */ | |
489 | if (file == NULL) | |
490 | return -1; | |
491 | state = (gz_statep)file; | |
492 | if (state->mode != GZ_READ && state->mode != GZ_WRITE) | |
493 | return -1; | |
494 | ||
495 | /* compute and return effective offset in file */ | |
496 | offset = LSEEK(state->fd, 0, SEEK_CUR); | |
497 | if (offset == -1) | |
498 | return -1; | |
499 | if (state->mode == GZ_READ) /* reading */ | |
500 | offset -= state->strm.avail_in; /* don't count buffered input */ | |
501 | return offset; | |
502 | } | |
503 | ||
504 | /* -- see zlib.h -- */ | |
505 | z_off_t ZEXPORT gzoffset(file) | |
506 | gzFile file; | |
507 | { | |
508 | z_off64_t ret; | |
509 | ||
510 | ret = gzoffset64(file); | |
511 | return ret == (z_off_t)ret ? (z_off_t)ret : -1; | |
512 | } | |
513 | ||
514 | /* -- see zlib.h -- */ | |
515 | int ZEXPORT gzeof(file) | |
516 | gzFile file; | |
517 | { | |
518 | gz_statep state; | |
519 | ||
520 | /* get internal structure and check integrity */ | |
521 | if (file == NULL) | |
522 | return 0; | |
523 | state = (gz_statep)file; | |
524 | if (state->mode != GZ_READ && state->mode != GZ_WRITE) | |
525 | return 0; | |
526 | ||
527 | /* return end-of-file state */ | |
9acb8ddf | 528 | return state->mode == GZ_READ ? state->past : 0; |
43743d63 MK |
529 | } |
530 | ||
531 | /* -- see zlib.h -- */ | |
532 | const char * ZEXPORT gzerror(file, errnum) | |
533 | gzFile file; | |
534 | int *errnum; | |
535 | { | |
536 | gz_statep state; | |
537 | ||
538 | /* get internal structure and check integrity */ | |
539 | if (file == NULL) | |
540 | return NULL; | |
541 | state = (gz_statep)file; | |
542 | if (state->mode != GZ_READ && state->mode != GZ_WRITE) | |
543 | return NULL; | |
544 | ||
545 | /* return error information */ | |
546 | if (errnum != NULL) | |
547 | *errnum = state->err; | |
cd9ec142 MK |
548 | return state->err == Z_MEM_ERROR ? "out of memory" : |
549 | (state->msg == NULL ? "" : state->msg); | |
43743d63 MK |
550 | } |
551 | ||
552 | /* -- see zlib.h -- */ | |
553 | void ZEXPORT gzclearerr(file) | |
554 | gzFile file; | |
555 | { | |
556 | gz_statep state; | |
557 | ||
558 | /* get internal structure and check integrity */ | |
559 | if (file == NULL) | |
560 | return; | |
561 | state = (gz_statep)file; | |
562 | if (state->mode != GZ_READ && state->mode != GZ_WRITE) | |
563 | return; | |
564 | ||
565 | /* clear error and end-of-file */ | |
9acb8ddf | 566 | if (state->mode == GZ_READ) { |
43743d63 | 567 | state->eof = 0; |
9acb8ddf MK |
568 | state->past = 0; |
569 | } | |
43743d63 MK |
570 | gz_error(state, Z_OK, NULL); |
571 | } | |
572 | ||
573 | /* Create an error message in allocated memory and set state->err and | |
574 | state->msg accordingly. Free any previous error message already there. Do | |
575 | not try to free or allocate space if the error is Z_MEM_ERROR (out of | |
576 | memory). Simply save the error message as a static string. If there is an | |
577 | allocation failure constructing the error message, then convert the error to | |
578 | out of memory. */ | |
579 | void ZLIB_INTERNAL gz_error(state, err, msg) | |
580 | gz_statep state; | |
581 | int err; | |
582 | const char *msg; | |
583 | { | |
584 | /* free previously allocated message and clear */ | |
585 | if (state->msg != NULL) { | |
586 | if (state->err != Z_MEM_ERROR) | |
587 | free(state->msg); | |
588 | state->msg = NULL; | |
589 | } | |
590 | ||
9acb8ddf MK |
591 | /* if fatal, set state->x.have to 0 so that the gzgetc() macro fails */ |
592 | if (err != Z_OK && err != Z_BUF_ERROR) | |
593 | state->x.have = 0; | |
594 | ||
43743d63 MK |
595 | /* set error code, and if no message, then done */ |
596 | state->err = err; | |
597 | if (msg == NULL) | |
598 | return; | |
599 | ||
cd9ec142 MK |
600 | /* for an out of memory error, return literal string when requested */ |
601 | if (err == Z_MEM_ERROR) | |
43743d63 | 602 | return; |
43743d63 MK |
603 | |
604 | /* construct error message with path */ | |
cd9ec142 MK |
605 | if ((state->msg = (char *)malloc(strlen(state->path) + strlen(msg) + 3)) == |
606 | NULL) { | |
43743d63 | 607 | state->err = Z_MEM_ERROR; |
43743d63 MK |
608 | return; |
609 | } | |
cd9ec142 | 610 | #if !defined(NO_snprintf) && !defined(NO_vsnprintf) |
b7aa844d MK |
611 | (void)snprintf(state->msg, strlen(state->path) + strlen(msg) + 3, |
612 | "%s%s%s", state->path, ": ", msg); | |
cd9ec142 | 613 | #else |
43743d63 MK |
614 | strcpy(state->msg, state->path); |
615 | strcat(state->msg, ": "); | |
616 | strcat(state->msg, msg); | |
cd9ec142 | 617 | #endif |
43743d63 MK |
618 | } |
619 | ||
620 | #ifndef INT_MAX | |
621 | /* portably return maximum value for an int (when limits.h presumed not | |
622 | available) -- we need to do this to cover cases where 2's complement not | |
623 | used, since C standard permits 1's complement and sign-bit representations, | |
624 | otherwise we could just use ((unsigned)-1) >> 1 */ | |
625 | unsigned ZLIB_INTERNAL gz_intmax() | |
626 | { | |
627 | unsigned p, q; | |
628 | ||
629 | p = 1; | |
630 | do { | |
631 | q = p; | |
632 | p <<= 1; | |
633 | p++; | |
634 | } while (p > q); | |
635 | return q >> 1; | |
636 | } | |
637 | #endif |