648db22b |
1 | /* gzlib.c contains minimal changes required to be compiled with zlibWrapper: |
2 | * - gz_statep was converted to union to work with -Wstrict-aliasing=1 */ |
3 | |
b24e7fce |
4 | /* gzlib.c -- zlib functions common to reading and writing gzip files |
648db22b |
5 | * Copyright (C) 2004-2017 Mark Adler |
6 | * For conditions of distribution and use, see https://www.zlib.net/zlib_license.html |
b24e7fce |
7 | */ |
8 | |
9 | #include "gzguts.h" |
10 | |
648db22b |
11 | #if defined(_WIN32) && !defined(__BORLANDC__) && !defined(__MINGW32__) |
b24e7fce |
12 | # define LSEEK _lseeki64 |
13 | #else |
14 | #if defined(_LARGEFILE64_SOURCE) && _LFS64_LARGEFILE-0 |
15 | # define LSEEK lseek64 |
16 | #else |
17 | # define LSEEK lseek |
18 | #endif |
19 | #endif |
20 | |
21 | /* Local functions */ |
648db22b |
22 | local void gz_reset _Z_OF((gz_statep)); |
23 | local gzFile gz_open _Z_OF((const void *, int, const char *)); |
b24e7fce |
24 | |
25 | #if defined UNDER_CE |
26 | |
27 | /* Map the Windows error number in ERROR to a locale-dependent error message |
28 | string and return a pointer to it. Typically, the values for ERROR come |
29 | from GetLastError. |
30 | |
31 | The string pointed to shall not be modified by the application, but may be |
32 | overwritten by a subsequent call to gz_strwinerror |
33 | |
34 | The gz_strwinerror function does not change the current setting of |
35 | GetLastError. */ |
f535537f |
36 | char ZLIB_INTERNAL *gz_strwinerror(DWORD error) { |
b24e7fce |
37 | static char buf[1024]; |
38 | |
39 | wchar_t *msgbuf; |
40 | DWORD lasterr = GetLastError(); |
41 | DWORD chars = FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM |
42 | | FORMAT_MESSAGE_ALLOCATE_BUFFER, |
43 | NULL, |
44 | error, |
45 | 0, /* Default language */ |
46 | (LPVOID)&msgbuf, |
47 | 0, |
48 | NULL); |
49 | if (chars != 0) { |
50 | /* If there is an \r\n appended, zap it. */ |
51 | if (chars >= 2 |
52 | && msgbuf[chars - 2] == '\r' && msgbuf[chars - 1] == '\n') { |
53 | chars -= 2; |
54 | msgbuf[chars] = 0; |
55 | } |
56 | |
57 | if (chars > sizeof (buf) - 1) { |
58 | chars = sizeof (buf) - 1; |
59 | msgbuf[chars] = 0; |
60 | } |
61 | |
62 | wcstombs(buf, msgbuf, chars + 1); |
63 | LocalFree(msgbuf); |
64 | } |
65 | else { |
66 | sprintf(buf, "unknown win32 error (%ld)", error); |
67 | } |
68 | |
69 | SetLastError(lasterr); |
70 | return buf; |
71 | } |
72 | |
73 | #endif /* UNDER_CE */ |
74 | |
75 | /* Reset gzip file state */ |
f535537f |
76 | local void gz_reset(gz_statep state) { |
648db22b |
77 | state.state->x.have = 0; /* no output data available */ |
78 | if (state.state->mode == GZ_READ) { /* for reading ... */ |
79 | state.state->eof = 0; /* not at end of file */ |
80 | state.state->past = 0; /* have not read past end yet */ |
81 | state.state->how = LOOK; /* look for gzip header */ |
b24e7fce |
82 | } |
648db22b |
83 | state.state->seek = 0; /* no seek request pending */ |
b24e7fce |
84 | gz_error(state, Z_OK, NULL); /* clear error */ |
648db22b |
85 | state.state->x.pos = 0; /* no uncompressed data yet */ |
86 | state.state->strm.avail_in = 0; /* no input data yet */ |
b24e7fce |
87 | } |
88 | |
89 | /* Open a gzip file either by name or file descriptor. */ |
f535537f |
90 | local gzFile gz_open(const void *path, int fd, const char *mode) { |
b24e7fce |
91 | gz_statep state; |
92 | z_size_t len; |
93 | int oflag; |
94 | #ifdef O_CLOEXEC |
95 | int cloexec = 0; |
96 | #endif |
97 | #ifdef O_EXCL |
98 | int exclusive = 0; |
99 | #endif |
100 | |
101 | /* check input */ |
102 | if (path == NULL) |
103 | return NULL; |
104 | |
105 | /* allocate gzFile structure to return */ |
648db22b |
106 | state.state = (gz_state*)malloc(sizeof(gz_state)); |
107 | if (state.state == NULL) |
b24e7fce |
108 | return NULL; |
648db22b |
109 | state.state->size = 0; /* no buffers allocated yet */ |
110 | state.state->want = GZBUFSIZE; /* requested buffer size */ |
111 | state.state->msg = NULL; /* no error message yet */ |
b24e7fce |
112 | |
113 | /* interpret mode */ |
648db22b |
114 | state.state->mode = GZ_NONE; |
115 | state.state->level = Z_DEFAULT_COMPRESSION; |
116 | state.state->strategy = Z_DEFAULT_STRATEGY; |
117 | state.state->direct = 0; |
b24e7fce |
118 | while (*mode) { |
119 | if (*mode >= '0' && *mode <= '9') |
648db22b |
120 | state.state->level = *mode - '0'; |
b24e7fce |
121 | else |
122 | switch (*mode) { |
123 | case 'r': |
648db22b |
124 | state.state->mode = GZ_READ; |
b24e7fce |
125 | break; |
126 | #ifndef NO_GZCOMPRESS |
127 | case 'w': |
648db22b |
128 | state.state->mode = GZ_WRITE; |
b24e7fce |
129 | break; |
130 | case 'a': |
648db22b |
131 | state.state->mode = GZ_APPEND; |
b24e7fce |
132 | break; |
133 | #endif |
134 | case '+': /* can't read and write at the same time */ |
648db22b |
135 | free(state.state); |
b24e7fce |
136 | return NULL; |
137 | case 'b': /* ignore -- will request binary anyway */ |
138 | break; |
139 | #ifdef O_CLOEXEC |
140 | case 'e': |
141 | cloexec = 1; |
142 | break; |
143 | #endif |
144 | #ifdef O_EXCL |
145 | case 'x': |
146 | exclusive = 1; |
147 | break; |
148 | #endif |
149 | case 'f': |
648db22b |
150 | state.state->strategy = Z_FILTERED; |
b24e7fce |
151 | break; |
152 | case 'h': |
648db22b |
153 | state.state->strategy = Z_HUFFMAN_ONLY; |
b24e7fce |
154 | break; |
155 | case 'R': |
648db22b |
156 | state.state->strategy = Z_RLE; |
b24e7fce |
157 | break; |
158 | case 'F': |
648db22b |
159 | state.state->strategy = Z_FIXED; |
b24e7fce |
160 | break; |
161 | case 'T': |
648db22b |
162 | state.state->direct = 1; |
b24e7fce |
163 | break; |
164 | default: /* could consider as an error, but just ignore */ |
165 | ; |
166 | } |
167 | mode++; |
168 | } |
169 | |
170 | /* must provide an "r", "w", or "a" */ |
648db22b |
171 | if (state.state->mode == GZ_NONE) { |
172 | free(state.state); |
b24e7fce |
173 | return NULL; |
174 | } |
175 | |
176 | /* can't force transparent read */ |
648db22b |
177 | if (state.state->mode == GZ_READ) { |
178 | if (state.state->direct) { |
179 | free(state.state); |
b24e7fce |
180 | return NULL; |
181 | } |
648db22b |
182 | state.state->direct = 1; /* for empty file */ |
b24e7fce |
183 | } |
184 | |
185 | /* save the path name for error messages */ |
186 | #ifdef WIDECHAR |
187 | if (fd == -2) { |
188 | len = wcstombs(NULL, path, 0); |
189 | if (len == (z_size_t)-1) |
190 | len = 0; |
191 | } |
192 | else |
193 | #endif |
194 | len = strlen((const char *)path); |
648db22b |
195 | state.state->path = (char *)malloc(len + 1); |
196 | if (state.state->path == NULL) { |
197 | free(state.state); |
b24e7fce |
198 | return NULL; |
199 | } |
200 | #ifdef WIDECHAR |
201 | if (fd == -2) |
202 | if (len) |
648db22b |
203 | wcstombs(state.state->path, path, len + 1); |
b24e7fce |
204 | else |
648db22b |
205 | *(state.state->path) = 0; |
b24e7fce |
206 | else |
207 | #endif |
208 | #if !defined(NO_snprintf) && !defined(NO_vsnprintf) |
648db22b |
209 | (void)snprintf(state.state->path, len + 1, "%s", (const char *)path); |
b24e7fce |
210 | #else |
648db22b |
211 | strcpy(state.state->path, (const char*)path); |
b24e7fce |
212 | #endif |
213 | |
214 | /* compute the flags for open() */ |
215 | oflag = |
216 | #ifdef O_LARGEFILE |
217 | O_LARGEFILE | |
218 | #endif |
219 | #ifdef O_BINARY |
220 | O_BINARY | |
221 | #endif |
222 | #ifdef O_CLOEXEC |
223 | (cloexec ? O_CLOEXEC : 0) | |
224 | #endif |
648db22b |
225 | (state.state->mode == GZ_READ ? |
b24e7fce |
226 | O_RDONLY : |
227 | (O_WRONLY | O_CREAT | |
228 | #ifdef O_EXCL |
229 | (exclusive ? O_EXCL : 0) | |
230 | #endif |
648db22b |
231 | (state.state->mode == GZ_WRITE ? |
b24e7fce |
232 | O_TRUNC : |
233 | O_APPEND))); |
234 | |
235 | /* open the file with the appropriate flags (or just use fd) */ |
648db22b |
236 | state.state->fd = fd > -1 ? fd : ( |
b24e7fce |
237 | #ifdef WIDECHAR |
238 | fd == -2 ? _wopen(path, oflag, 0666) : |
239 | #endif |
240 | open((const char *)path, oflag, 0666)); |
648db22b |
241 | if (state.state->fd == -1) { |
242 | free(state.state->path); |
243 | free(state.state); |
b24e7fce |
244 | return NULL; |
245 | } |
648db22b |
246 | if (state.state->mode == GZ_APPEND) { |
247 | LSEEK(state.state->fd, 0, SEEK_END); /* so gzoffset() is correct */ |
248 | state.state->mode = GZ_WRITE; /* simplify later checks */ |
b24e7fce |
249 | } |
250 | |
251 | /* save the current position for rewinding (only if reading) */ |
648db22b |
252 | if (state.state->mode == GZ_READ) { |
253 | state.state->start = LSEEK(state.state->fd, 0, SEEK_CUR); |
254 | if (state.state->start == -1) state.state->start = 0; |
b24e7fce |
255 | } |
256 | |
257 | /* initialize stream */ |
258 | gz_reset(state); |
259 | |
260 | /* return stream */ |
648db22b |
261 | return state.file; |
b24e7fce |
262 | } |
263 | |
264 | /* -- see zlib.h -- */ |
f535537f |
265 | gzFile ZEXPORT gzopen(const char *path, const char *mode) { |
b24e7fce |
266 | return gz_open(path, -1, mode); |
267 | } |
268 | |
269 | /* -- see zlib.h -- */ |
f535537f |
270 | gzFile ZEXPORT gzopen64(const char *path, const char *mode) { |
b24e7fce |
271 | return gz_open(path, -1, mode); |
272 | } |
273 | |
274 | /* -- see zlib.h -- */ |
f535537f |
275 | gzFile ZEXPORT gzdopen(int fd, const char *mode) { |
b24e7fce |
276 | char *path; /* identifier for error messages */ |
277 | gzFile gz; |
278 | |
279 | if (fd == -1 || (path = (char *)malloc(7 + 3 * sizeof(int))) == NULL) |
280 | return NULL; |
281 | #if !defined(NO_snprintf) && !defined(NO_vsnprintf) |
282 | (void)snprintf(path, 7 + 3 * sizeof(int), "<fd:%d>", fd); |
283 | #else |
284 | sprintf(path, "<fd:%d>", fd); /* for debugging */ |
285 | #endif |
286 | gz = gz_open(path, fd, mode); |
287 | free(path); |
288 | return gz; |
289 | } |
290 | |
291 | /* -- see zlib.h -- */ |
292 | #ifdef WIDECHAR |
f535537f |
293 | gzFile ZEXPORT gzopen_w(const wchar_t *path, const char *mode) { |
b24e7fce |
294 | return gz_open(path, -2, mode); |
295 | } |
296 | #endif |
297 | |
298 | /* -- see zlib.h -- */ |
f535537f |
299 | int ZEXPORT gzbuffer(gzFile file, unsigned size) { |
b24e7fce |
300 | gz_statep state; |
301 | |
302 | /* get internal structure and check integrity */ |
303 | if (file == NULL) |
304 | return -1; |
648db22b |
305 | state.file = file; |
306 | if (state.state->mode != GZ_READ && state.state->mode != GZ_WRITE) |
b24e7fce |
307 | return -1; |
308 | |
309 | /* make sure we haven't already allocated memory */ |
648db22b |
310 | if (state.state->size != 0) |
b24e7fce |
311 | return -1; |
312 | |
313 | /* check and set requested size */ |
314 | if ((size << 1) < size) |
315 | return -1; /* need to be able to double it */ |
316 | if (size < 2) |
317 | size = 2; /* need two bytes to check magic header */ |
648db22b |
318 | state.state->want = size; |
b24e7fce |
319 | return 0; |
320 | } |
321 | |
322 | /* -- see zlib.h -- */ |
f535537f |
323 | int ZEXPORT gzrewind(gzFile file) { |
b24e7fce |
324 | gz_statep state; |
325 | |
326 | /* get internal structure */ |
327 | if (file == NULL) |
328 | return -1; |
648db22b |
329 | state.file = file; |
b24e7fce |
330 | |
331 | /* check that we're reading and that there's no error */ |
648db22b |
332 | if (state.state->mode != GZ_READ || |
333 | (state.state->err != Z_OK && state.state->err != Z_BUF_ERROR)) |
b24e7fce |
334 | return -1; |
335 | |
336 | /* back up and start over */ |
648db22b |
337 | if (LSEEK(state.state->fd, state.state->start, SEEK_SET) == -1) |
b24e7fce |
338 | return -1; |
339 | gz_reset(state); |
340 | return 0; |
341 | } |
342 | |
343 | /* -- see zlib.h -- */ |
f535537f |
344 | z_off64_t ZEXPORT gzseek64(gzFile file, z_off64_t offset, int whence) { |
b24e7fce |
345 | unsigned n; |
346 | z_off64_t ret; |
347 | gz_statep state; |
348 | |
349 | /* get internal structure and check integrity */ |
350 | if (file == NULL) |
351 | return -1; |
648db22b |
352 | state.file = file; |
353 | if (state.state->mode != GZ_READ && state.state->mode != GZ_WRITE) |
b24e7fce |
354 | return -1; |
355 | |
356 | /* check that there's no error */ |
648db22b |
357 | if (state.state->err != Z_OK && state.state->err != Z_BUF_ERROR) |
b24e7fce |
358 | return -1; |
359 | |
360 | /* can only seek from start or relative to current position */ |
361 | if (whence != SEEK_SET && whence != SEEK_CUR) |
362 | return -1; |
363 | |
364 | /* normalize offset to a SEEK_CUR specification */ |
365 | if (whence == SEEK_SET) |
648db22b |
366 | offset -= state.state->x.pos; |
367 | else if (state.state->seek) |
368 | offset += state.state->skip; |
369 | state.state->seek = 0; |
b24e7fce |
370 | |
371 | /* if within raw area while reading, just go there */ |
648db22b |
372 | if (state.state->mode == GZ_READ && state.state->how == COPY && |
373 | state.state->x.pos + offset >= 0) { |
374 | ret = LSEEK(state.state->fd, offset - state.state->x.have, SEEK_CUR); |
b24e7fce |
375 | if (ret == -1) |
376 | return -1; |
648db22b |
377 | state.state->x.have = 0; |
378 | state.state->eof = 0; |
379 | state.state->past = 0; |
380 | state.state->seek = 0; |
b24e7fce |
381 | gz_error(state, Z_OK, NULL); |
648db22b |
382 | state.state->strm.avail_in = 0; |
383 | state.state->x.pos += offset; |
384 | return state.state->x.pos; |
b24e7fce |
385 | } |
386 | |
387 | /* calculate skip amount, rewinding if needed for back seek when reading */ |
388 | if (offset < 0) { |
648db22b |
389 | if (state.state->mode != GZ_READ) /* writing -- can't go backwards */ |
b24e7fce |
390 | return -1; |
648db22b |
391 | offset += state.state->x.pos; |
b24e7fce |
392 | if (offset < 0) /* before start of file! */ |
393 | return -1; |
394 | if (gzrewind(file) == -1) /* rewind, then skip to offset */ |
395 | return -1; |
396 | } |
397 | |
398 | /* if reading, skip what's in output buffer (one less gzgetc() check) */ |
648db22b |
399 | if (state.state->mode == GZ_READ) { |
400 | n = GT_OFF(state.state->x.have) || (z_off64_t)state.state->x.have > offset ? |
401 | (unsigned)offset : state.state->x.have; |
402 | state.state->x.have -= n; |
403 | state.state->x.next += n; |
404 | state.state->x.pos += n; |
b24e7fce |
405 | offset -= n; |
406 | } |
407 | |
408 | /* request skip (if not zero) */ |
409 | if (offset) { |
648db22b |
410 | state.state->seek = 1; |
411 | state.state->skip = offset; |
b24e7fce |
412 | } |
648db22b |
413 | return state.state->x.pos + offset; |
b24e7fce |
414 | } |
415 | |
416 | /* -- see zlib.h -- */ |
f535537f |
417 | z_off_t ZEXPORT gzseek(gzFile file, z_off_t offset, int whence) { |
b24e7fce |
418 | z_off64_t ret; |
419 | |
420 | ret = gzseek64(file, (z_off64_t)offset, whence); |
421 | return ret == (z_off_t)ret ? (z_off_t)ret : -1; |
422 | } |
423 | |
424 | /* -- see zlib.h -- */ |
f535537f |
425 | z_off64_t ZEXPORT gztell64(gzFile file) { |
b24e7fce |
426 | gz_statep state; |
427 | |
428 | /* get internal structure and check integrity */ |
429 | if (file == NULL) |
430 | return -1; |
648db22b |
431 | state.file = file; |
432 | if (state.state->mode != GZ_READ && state.state->mode != GZ_WRITE) |
b24e7fce |
433 | return -1; |
434 | |
435 | /* return position */ |
648db22b |
436 | return state.state->x.pos + (state.state->seek ? state.state->skip : 0); |
b24e7fce |
437 | } |
438 | |
439 | /* -- see zlib.h -- */ |
f535537f |
440 | z_off_t ZEXPORT gztell(gzFile file) { |
b24e7fce |
441 | z_off64_t ret; |
442 | |
443 | ret = gztell64(file); |
444 | return ret == (z_off_t)ret ? (z_off_t)ret : -1; |
445 | } |
446 | |
447 | /* -- see zlib.h -- */ |
f535537f |
448 | z_off64_t ZEXPORT gzoffset64(gzFile file) { |
b24e7fce |
449 | z_off64_t offset; |
450 | gz_statep state; |
451 | |
452 | /* get internal structure and check integrity */ |
453 | if (file == NULL) |
454 | return -1; |
648db22b |
455 | state.file = file; |
456 | if (state.state->mode != GZ_READ && state.state->mode != GZ_WRITE) |
b24e7fce |
457 | return -1; |
458 | |
459 | /* compute and return effective offset in file */ |
648db22b |
460 | offset = LSEEK(state.state->fd, 0, SEEK_CUR); |
b24e7fce |
461 | if (offset == -1) |
462 | return -1; |
648db22b |
463 | if (state.state->mode == GZ_READ) /* reading */ |
464 | offset -= state.state->strm.avail_in; /* don't count buffered input */ |
b24e7fce |
465 | return offset; |
466 | } |
467 | |
468 | /* -- see zlib.h -- */ |
f535537f |
469 | z_off_t ZEXPORT gzoffset(gzFile file) { |
b24e7fce |
470 | z_off64_t ret; |
471 | |
472 | ret = gzoffset64(file); |
473 | return ret == (z_off_t)ret ? (z_off_t)ret : -1; |
474 | } |
475 | |
476 | /* -- see zlib.h -- */ |
f535537f |
477 | int ZEXPORT gzeof(gzFile file) { |
b24e7fce |
478 | gz_statep state; |
479 | |
480 | /* get internal structure and check integrity */ |
481 | if (file == NULL) |
482 | return 0; |
648db22b |
483 | state.file = file; |
484 | if (state.state->mode != GZ_READ && state.state->mode != GZ_WRITE) |
b24e7fce |
485 | return 0; |
486 | |
487 | /* return end-of-file state */ |
648db22b |
488 | return state.state->mode == GZ_READ ? state.state->past : 0; |
b24e7fce |
489 | } |
490 | |
491 | /* -- see zlib.h -- */ |
f535537f |
492 | const char * ZEXPORT gzerror(gzFile file, int *errnum) { |
b24e7fce |
493 | gz_statep state; |
494 | |
495 | /* get internal structure and check integrity */ |
496 | if (file == NULL) |
497 | return NULL; |
648db22b |
498 | state.file = file; |
499 | if (state.state->mode != GZ_READ && state.state->mode != GZ_WRITE) |
b24e7fce |
500 | return NULL; |
501 | |
502 | /* return error information */ |
503 | if (errnum != NULL) |
648db22b |
504 | *errnum = state.state->err; |
505 | return state.state->err == Z_MEM_ERROR ? "out of memory" : |
506 | (state.state->msg == NULL ? "" : state.state->msg); |
b24e7fce |
507 | } |
508 | |
509 | /* -- see zlib.h -- */ |
f535537f |
510 | void ZEXPORT gzclearerr(gzFile file) { |
b24e7fce |
511 | gz_statep state; |
512 | |
513 | /* get internal structure and check integrity */ |
514 | if (file == NULL) |
515 | return; |
648db22b |
516 | state.file = file; |
517 | if (state.state->mode != GZ_READ && state.state->mode != GZ_WRITE) |
b24e7fce |
518 | return; |
519 | |
520 | /* clear error and end-of-file */ |
648db22b |
521 | if (state.state->mode == GZ_READ) { |
522 | state.state->eof = 0; |
523 | state.state->past = 0; |
b24e7fce |
524 | } |
525 | gz_error(state, Z_OK, NULL); |
526 | } |
527 | |
648db22b |
528 | /* Create an error message in allocated memory and set state.state->err and |
529 | state.state->msg accordingly. Free any previous error message already there. Do |
b24e7fce |
530 | not try to free or allocate space if the error is Z_MEM_ERROR (out of |
531 | memory). Simply save the error message as a static string. If there is an |
532 | allocation failure constructing the error message, then convert the error to |
533 | out of memory. */ |
f535537f |
534 | void ZLIB_INTERNAL gz_error(gz_statep state, int err, const char *msg) { |
b24e7fce |
535 | /* free previously allocated message and clear */ |
648db22b |
536 | if (state.state->msg != NULL) { |
537 | if (state.state->err != Z_MEM_ERROR) |
538 | free(state.state->msg); |
539 | state.state->msg = NULL; |
b24e7fce |
540 | } |
541 | |
648db22b |
542 | /* if fatal, set state.state->x.have to 0 so that the gzgetc() macro fails */ |
b24e7fce |
543 | if (err != Z_OK && err != Z_BUF_ERROR) |
648db22b |
544 | state.state->x.have = 0; |
b24e7fce |
545 | |
546 | /* set error code, and if no message, then done */ |
648db22b |
547 | state.state->err = err; |
b24e7fce |
548 | if (msg == NULL) |
549 | return; |
550 | |
551 | /* for an out of memory error, return literal string when requested */ |
552 | if (err == Z_MEM_ERROR) |
553 | return; |
554 | |
555 | /* construct error message with path */ |
648db22b |
556 | if ((state.state->msg = (char *)malloc(strlen(state.state->path) + strlen(msg) + 3)) == |
b24e7fce |
557 | NULL) { |
648db22b |
558 | state.state->err = Z_MEM_ERROR; |
b24e7fce |
559 | return; |
560 | } |
561 | #if !defined(NO_snprintf) && !defined(NO_vsnprintf) |
648db22b |
562 | (void)snprintf(state.state->msg, strlen(state.state->path) + strlen(msg) + 3, |
563 | "%s%s%s", state.state->path, ": ", msg); |
b24e7fce |
564 | #else |
648db22b |
565 | strcpy(state.state->msg, state.state->path); |
566 | strcat(state.state->msg, ": "); |
567 | strcat(state.state->msg, msg); |
b24e7fce |
568 | #endif |
569 | } |
570 | |
571 | #ifndef INT_MAX |
572 | /* portably return maximum value for an int (when limits.h presumed not |
573 | available) -- we need to do this to cover cases where 2's complement not |
574 | used, since C standard permits 1's complement and sign-bit representations, |
575 | otherwise we could just use ((unsigned)-1) >> 1 */ |
f535537f |
576 | unsigned ZLIB_INTERNAL gz_intmax() { |
b24e7fce |
577 | unsigned p, q; |
578 | |
579 | p = 1; |
580 | do { |
581 | q = p; |
582 | p <<= 1; |
583 | p++; |
584 | } while (p > q); |
585 | return q >> 1; |
586 | } |
587 | #endif |