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. */ |
648db22b |
36 | char ZLIB_INTERNAL *gz_strwinerror (error) |
b24e7fce |
37 | DWORD error; |
38 | { |
39 | static char buf[1024]; |
40 | |
41 | wchar_t *msgbuf; |
42 | DWORD lasterr = GetLastError(); |
43 | DWORD chars = FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM |
44 | | FORMAT_MESSAGE_ALLOCATE_BUFFER, |
45 | NULL, |
46 | error, |
47 | 0, /* Default language */ |
48 | (LPVOID)&msgbuf, |
49 | 0, |
50 | NULL); |
51 | if (chars != 0) { |
52 | /* If there is an \r\n appended, zap it. */ |
53 | if (chars >= 2 |
54 | && msgbuf[chars - 2] == '\r' && msgbuf[chars - 1] == '\n') { |
55 | chars -= 2; |
56 | msgbuf[chars] = 0; |
57 | } |
58 | |
59 | if (chars > sizeof (buf) - 1) { |
60 | chars = sizeof (buf) - 1; |
61 | msgbuf[chars] = 0; |
62 | } |
63 | |
64 | wcstombs(buf, msgbuf, chars + 1); |
65 | LocalFree(msgbuf); |
66 | } |
67 | else { |
68 | sprintf(buf, "unknown win32 error (%ld)", error); |
69 | } |
70 | |
71 | SetLastError(lasterr); |
72 | return buf; |
73 | } |
74 | |
75 | #endif /* UNDER_CE */ |
76 | |
77 | /* Reset gzip file state */ |
78 | local void gz_reset(state) |
79 | gz_statep state; |
80 | { |
648db22b |
81 | state.state->x.have = 0; /* no output data available */ |
82 | if (state.state->mode == GZ_READ) { /* for reading ... */ |
83 | state.state->eof = 0; /* not at end of file */ |
84 | state.state->past = 0; /* have not read past end yet */ |
85 | state.state->how = LOOK; /* look for gzip header */ |
b24e7fce |
86 | } |
648db22b |
87 | state.state->seek = 0; /* no seek request pending */ |
b24e7fce |
88 | gz_error(state, Z_OK, NULL); /* clear error */ |
648db22b |
89 | state.state->x.pos = 0; /* no uncompressed data yet */ |
90 | state.state->strm.avail_in = 0; /* no input data yet */ |
b24e7fce |
91 | } |
92 | |
93 | /* Open a gzip file either by name or file descriptor. */ |
94 | local gzFile gz_open(path, fd, mode) |
95 | const void *path; |
96 | int fd; |
97 | const char *mode; |
98 | { |
99 | gz_statep state; |
100 | z_size_t len; |
101 | int oflag; |
102 | #ifdef O_CLOEXEC |
103 | int cloexec = 0; |
104 | #endif |
105 | #ifdef O_EXCL |
106 | int exclusive = 0; |
107 | #endif |
108 | |
109 | /* check input */ |
110 | if (path == NULL) |
111 | return NULL; |
112 | |
113 | /* allocate gzFile structure to return */ |
648db22b |
114 | state.state = (gz_state*)malloc(sizeof(gz_state)); |
115 | if (state.state == NULL) |
b24e7fce |
116 | return NULL; |
648db22b |
117 | state.state->size = 0; /* no buffers allocated yet */ |
118 | state.state->want = GZBUFSIZE; /* requested buffer size */ |
119 | state.state->msg = NULL; /* no error message yet */ |
b24e7fce |
120 | |
121 | /* interpret mode */ |
648db22b |
122 | state.state->mode = GZ_NONE; |
123 | state.state->level = Z_DEFAULT_COMPRESSION; |
124 | state.state->strategy = Z_DEFAULT_STRATEGY; |
125 | state.state->direct = 0; |
b24e7fce |
126 | while (*mode) { |
127 | if (*mode >= '0' && *mode <= '9') |
648db22b |
128 | state.state->level = *mode - '0'; |
b24e7fce |
129 | else |
130 | switch (*mode) { |
131 | case 'r': |
648db22b |
132 | state.state->mode = GZ_READ; |
b24e7fce |
133 | break; |
134 | #ifndef NO_GZCOMPRESS |
135 | case 'w': |
648db22b |
136 | state.state->mode = GZ_WRITE; |
b24e7fce |
137 | break; |
138 | case 'a': |
648db22b |
139 | state.state->mode = GZ_APPEND; |
b24e7fce |
140 | break; |
141 | #endif |
142 | case '+': /* can't read and write at the same time */ |
648db22b |
143 | free(state.state); |
b24e7fce |
144 | return NULL; |
145 | case 'b': /* ignore -- will request binary anyway */ |
146 | break; |
147 | #ifdef O_CLOEXEC |
148 | case 'e': |
149 | cloexec = 1; |
150 | break; |
151 | #endif |
152 | #ifdef O_EXCL |
153 | case 'x': |
154 | exclusive = 1; |
155 | break; |
156 | #endif |
157 | case 'f': |
648db22b |
158 | state.state->strategy = Z_FILTERED; |
b24e7fce |
159 | break; |
160 | case 'h': |
648db22b |
161 | state.state->strategy = Z_HUFFMAN_ONLY; |
b24e7fce |
162 | break; |
163 | case 'R': |
648db22b |
164 | state.state->strategy = Z_RLE; |
b24e7fce |
165 | break; |
166 | case 'F': |
648db22b |
167 | state.state->strategy = Z_FIXED; |
b24e7fce |
168 | break; |
169 | case 'T': |
648db22b |
170 | state.state->direct = 1; |
b24e7fce |
171 | break; |
172 | default: /* could consider as an error, but just ignore */ |
173 | ; |
174 | } |
175 | mode++; |
176 | } |
177 | |
178 | /* must provide an "r", "w", or "a" */ |
648db22b |
179 | if (state.state->mode == GZ_NONE) { |
180 | free(state.state); |
b24e7fce |
181 | return NULL; |
182 | } |
183 | |
184 | /* can't force transparent read */ |
648db22b |
185 | if (state.state->mode == GZ_READ) { |
186 | if (state.state->direct) { |
187 | free(state.state); |
b24e7fce |
188 | return NULL; |
189 | } |
648db22b |
190 | state.state->direct = 1; /* for empty file */ |
b24e7fce |
191 | } |
192 | |
193 | /* save the path name for error messages */ |
194 | #ifdef WIDECHAR |
195 | if (fd == -2) { |
196 | len = wcstombs(NULL, path, 0); |
197 | if (len == (z_size_t)-1) |
198 | len = 0; |
199 | } |
200 | else |
201 | #endif |
202 | len = strlen((const char *)path); |
648db22b |
203 | state.state->path = (char *)malloc(len + 1); |
204 | if (state.state->path == NULL) { |
205 | free(state.state); |
b24e7fce |
206 | return NULL; |
207 | } |
208 | #ifdef WIDECHAR |
209 | if (fd == -2) |
210 | if (len) |
648db22b |
211 | wcstombs(state.state->path, path, len + 1); |
b24e7fce |
212 | else |
648db22b |
213 | *(state.state->path) = 0; |
b24e7fce |
214 | else |
215 | #endif |
216 | #if !defined(NO_snprintf) && !defined(NO_vsnprintf) |
648db22b |
217 | (void)snprintf(state.state->path, len + 1, "%s", (const char *)path); |
b24e7fce |
218 | #else |
648db22b |
219 | strcpy(state.state->path, (const char*)path); |
b24e7fce |
220 | #endif |
221 | |
222 | /* compute the flags for open() */ |
223 | oflag = |
224 | #ifdef O_LARGEFILE |
225 | O_LARGEFILE | |
226 | #endif |
227 | #ifdef O_BINARY |
228 | O_BINARY | |
229 | #endif |
230 | #ifdef O_CLOEXEC |
231 | (cloexec ? O_CLOEXEC : 0) | |
232 | #endif |
648db22b |
233 | (state.state->mode == GZ_READ ? |
b24e7fce |
234 | O_RDONLY : |
235 | (O_WRONLY | O_CREAT | |
236 | #ifdef O_EXCL |
237 | (exclusive ? O_EXCL : 0) | |
238 | #endif |
648db22b |
239 | (state.state->mode == GZ_WRITE ? |
b24e7fce |
240 | O_TRUNC : |
241 | O_APPEND))); |
242 | |
243 | /* open the file with the appropriate flags (or just use fd) */ |
648db22b |
244 | state.state->fd = fd > -1 ? fd : ( |
b24e7fce |
245 | #ifdef WIDECHAR |
246 | fd == -2 ? _wopen(path, oflag, 0666) : |
247 | #endif |
248 | open((const char *)path, oflag, 0666)); |
648db22b |
249 | if (state.state->fd == -1) { |
250 | free(state.state->path); |
251 | free(state.state); |
b24e7fce |
252 | return NULL; |
253 | } |
648db22b |
254 | if (state.state->mode == GZ_APPEND) { |
255 | LSEEK(state.state->fd, 0, SEEK_END); /* so gzoffset() is correct */ |
256 | state.state->mode = GZ_WRITE; /* simplify later checks */ |
b24e7fce |
257 | } |
258 | |
259 | /* save the current position for rewinding (only if reading) */ |
648db22b |
260 | if (state.state->mode == GZ_READ) { |
261 | state.state->start = LSEEK(state.state->fd, 0, SEEK_CUR); |
262 | if (state.state->start == -1) state.state->start = 0; |
b24e7fce |
263 | } |
264 | |
265 | /* initialize stream */ |
266 | gz_reset(state); |
267 | |
268 | /* return stream */ |
648db22b |
269 | return state.file; |
b24e7fce |
270 | } |
271 | |
272 | /* -- see zlib.h -- */ |
273 | gzFile ZEXPORT gzopen(path, mode) |
274 | const char *path; |
275 | const char *mode; |
276 | { |
277 | return gz_open(path, -1, mode); |
278 | } |
279 | |
280 | /* -- see zlib.h -- */ |
281 | gzFile ZEXPORT gzopen64(path, mode) |
282 | const char *path; |
283 | const char *mode; |
284 | { |
285 | return gz_open(path, -1, mode); |
286 | } |
287 | |
288 | /* -- see zlib.h -- */ |
289 | gzFile ZEXPORT gzdopen(fd, mode) |
290 | int fd; |
291 | const char *mode; |
292 | { |
293 | char *path; /* identifier for error messages */ |
294 | gzFile gz; |
295 | |
296 | if (fd == -1 || (path = (char *)malloc(7 + 3 * sizeof(int))) == NULL) |
297 | return NULL; |
298 | #if !defined(NO_snprintf) && !defined(NO_vsnprintf) |
299 | (void)snprintf(path, 7 + 3 * sizeof(int), "<fd:%d>", fd); |
300 | #else |
301 | sprintf(path, "<fd:%d>", fd); /* for debugging */ |
302 | #endif |
303 | gz = gz_open(path, fd, mode); |
304 | free(path); |
305 | return gz; |
306 | } |
307 | |
308 | /* -- see zlib.h -- */ |
309 | #ifdef WIDECHAR |
310 | gzFile ZEXPORT gzopen_w(path, mode) |
311 | const wchar_t *path; |
312 | const char *mode; |
313 | { |
314 | return gz_open(path, -2, mode); |
315 | } |
316 | #endif |
317 | |
318 | /* -- see zlib.h -- */ |
319 | int ZEXPORT gzbuffer(file, size) |
320 | gzFile file; |
321 | unsigned size; |
322 | { |
323 | gz_statep state; |
324 | |
325 | /* get internal structure and check integrity */ |
326 | if (file == NULL) |
327 | return -1; |
648db22b |
328 | state.file = file; |
329 | if (state.state->mode != GZ_READ && state.state->mode != GZ_WRITE) |
b24e7fce |
330 | return -1; |
331 | |
332 | /* make sure we haven't already allocated memory */ |
648db22b |
333 | if (state.state->size != 0) |
b24e7fce |
334 | return -1; |
335 | |
336 | /* check and set requested size */ |
337 | if ((size << 1) < size) |
338 | return -1; /* need to be able to double it */ |
339 | if (size < 2) |
340 | size = 2; /* need two bytes to check magic header */ |
648db22b |
341 | state.state->want = size; |
b24e7fce |
342 | return 0; |
343 | } |
344 | |
345 | /* -- see zlib.h -- */ |
346 | int ZEXPORT gzrewind(file) |
347 | gzFile file; |
348 | { |
349 | gz_statep state; |
350 | |
351 | /* get internal structure */ |
352 | if (file == NULL) |
353 | return -1; |
648db22b |
354 | state.file = file; |
b24e7fce |
355 | |
356 | /* check that we're reading and that there's no error */ |
648db22b |
357 | if (state.state->mode != GZ_READ || |
358 | (state.state->err != Z_OK && state.state->err != Z_BUF_ERROR)) |
b24e7fce |
359 | return -1; |
360 | |
361 | /* back up and start over */ |
648db22b |
362 | if (LSEEK(state.state->fd, state.state->start, SEEK_SET) == -1) |
b24e7fce |
363 | return -1; |
364 | gz_reset(state); |
365 | return 0; |
366 | } |
367 | |
368 | /* -- see zlib.h -- */ |
369 | z_off64_t ZEXPORT gzseek64(file, offset, whence) |
370 | gzFile file; |
371 | z_off64_t offset; |
372 | int whence; |
373 | { |
374 | unsigned n; |
375 | z_off64_t ret; |
376 | gz_statep state; |
377 | |
378 | /* get internal structure and check integrity */ |
379 | if (file == NULL) |
380 | return -1; |
648db22b |
381 | state.file = file; |
382 | if (state.state->mode != GZ_READ && state.state->mode != GZ_WRITE) |
b24e7fce |
383 | return -1; |
384 | |
385 | /* check that there's no error */ |
648db22b |
386 | if (state.state->err != Z_OK && state.state->err != Z_BUF_ERROR) |
b24e7fce |
387 | return -1; |
388 | |
389 | /* can only seek from start or relative to current position */ |
390 | if (whence != SEEK_SET && whence != SEEK_CUR) |
391 | return -1; |
392 | |
393 | /* normalize offset to a SEEK_CUR specification */ |
394 | if (whence == SEEK_SET) |
648db22b |
395 | offset -= state.state->x.pos; |
396 | else if (state.state->seek) |
397 | offset += state.state->skip; |
398 | state.state->seek = 0; |
b24e7fce |
399 | |
400 | /* if within raw area while reading, just go there */ |
648db22b |
401 | if (state.state->mode == GZ_READ && state.state->how == COPY && |
402 | state.state->x.pos + offset >= 0) { |
403 | ret = LSEEK(state.state->fd, offset - state.state->x.have, SEEK_CUR); |
b24e7fce |
404 | if (ret == -1) |
405 | return -1; |
648db22b |
406 | state.state->x.have = 0; |
407 | state.state->eof = 0; |
408 | state.state->past = 0; |
409 | state.state->seek = 0; |
b24e7fce |
410 | gz_error(state, Z_OK, NULL); |
648db22b |
411 | state.state->strm.avail_in = 0; |
412 | state.state->x.pos += offset; |
413 | return state.state->x.pos; |
b24e7fce |
414 | } |
415 | |
416 | /* calculate skip amount, rewinding if needed for back seek when reading */ |
417 | if (offset < 0) { |
648db22b |
418 | if (state.state->mode != GZ_READ) /* writing -- can't go backwards */ |
b24e7fce |
419 | return -1; |
648db22b |
420 | offset += state.state->x.pos; |
b24e7fce |
421 | if (offset < 0) /* before start of file! */ |
422 | return -1; |
423 | if (gzrewind(file) == -1) /* rewind, then skip to offset */ |
424 | return -1; |
425 | } |
426 | |
427 | /* if reading, skip what's in output buffer (one less gzgetc() check) */ |
648db22b |
428 | if (state.state->mode == GZ_READ) { |
429 | n = GT_OFF(state.state->x.have) || (z_off64_t)state.state->x.have > offset ? |
430 | (unsigned)offset : state.state->x.have; |
431 | state.state->x.have -= n; |
432 | state.state->x.next += n; |
433 | state.state->x.pos += n; |
b24e7fce |
434 | offset -= n; |
435 | } |
436 | |
437 | /* request skip (if not zero) */ |
438 | if (offset) { |
648db22b |
439 | state.state->seek = 1; |
440 | state.state->skip = offset; |
b24e7fce |
441 | } |
648db22b |
442 | return state.state->x.pos + offset; |
b24e7fce |
443 | } |
444 | |
445 | /* -- see zlib.h -- */ |
446 | z_off_t ZEXPORT gzseek(file, offset, whence) |
447 | gzFile file; |
448 | z_off_t offset; |
449 | int whence; |
450 | { |
451 | z_off64_t ret; |
452 | |
453 | ret = gzseek64(file, (z_off64_t)offset, whence); |
454 | return ret == (z_off_t)ret ? (z_off_t)ret : -1; |
455 | } |
456 | |
457 | /* -- see zlib.h -- */ |
458 | z_off64_t ZEXPORT gztell64(file) |
459 | gzFile file; |
460 | { |
461 | gz_statep state; |
462 | |
463 | /* get internal structure and check integrity */ |
464 | if (file == NULL) |
465 | return -1; |
648db22b |
466 | state.file = file; |
467 | if (state.state->mode != GZ_READ && state.state->mode != GZ_WRITE) |
b24e7fce |
468 | return -1; |
469 | |
470 | /* return position */ |
648db22b |
471 | return state.state->x.pos + (state.state->seek ? state.state->skip : 0); |
b24e7fce |
472 | } |
473 | |
474 | /* -- see zlib.h -- */ |
475 | z_off_t ZEXPORT gztell(file) |
476 | gzFile file; |
477 | { |
478 | z_off64_t ret; |
479 | |
480 | ret = gztell64(file); |
481 | return ret == (z_off_t)ret ? (z_off_t)ret : -1; |
482 | } |
483 | |
484 | /* -- see zlib.h -- */ |
485 | z_off64_t ZEXPORT gzoffset64(file) |
486 | gzFile file; |
487 | { |
488 | z_off64_t offset; |
489 | gz_statep state; |
490 | |
491 | /* get internal structure and check integrity */ |
492 | if (file == NULL) |
493 | return -1; |
648db22b |
494 | state.file = file; |
495 | if (state.state->mode != GZ_READ && state.state->mode != GZ_WRITE) |
b24e7fce |
496 | return -1; |
497 | |
498 | /* compute and return effective offset in file */ |
648db22b |
499 | offset = LSEEK(state.state->fd, 0, SEEK_CUR); |
b24e7fce |
500 | if (offset == -1) |
501 | return -1; |
648db22b |
502 | if (state.state->mode == GZ_READ) /* reading */ |
503 | offset -= state.state->strm.avail_in; /* don't count buffered input */ |
b24e7fce |
504 | return offset; |
505 | } |
506 | |
507 | /* -- see zlib.h -- */ |
508 | z_off_t ZEXPORT gzoffset(file) |
509 | gzFile file; |
510 | { |
511 | z_off64_t ret; |
512 | |
513 | ret = gzoffset64(file); |
514 | return ret == (z_off_t)ret ? (z_off_t)ret : -1; |
515 | } |
516 | |
517 | /* -- see zlib.h -- */ |
518 | int ZEXPORT gzeof(file) |
519 | gzFile file; |
520 | { |
521 | gz_statep state; |
522 | |
523 | /* get internal structure and check integrity */ |
524 | if (file == NULL) |
525 | return 0; |
648db22b |
526 | state.file = file; |
527 | if (state.state->mode != GZ_READ && state.state->mode != GZ_WRITE) |
b24e7fce |
528 | return 0; |
529 | |
530 | /* return end-of-file state */ |
648db22b |
531 | return state.state->mode == GZ_READ ? state.state->past : 0; |
b24e7fce |
532 | } |
533 | |
534 | /* -- see zlib.h -- */ |
535 | const char * ZEXPORT gzerror(file, errnum) |
536 | gzFile file; |
537 | int *errnum; |
538 | { |
539 | gz_statep state; |
540 | |
541 | /* get internal structure and check integrity */ |
542 | if (file == NULL) |
543 | return NULL; |
648db22b |
544 | state.file = file; |
545 | if (state.state->mode != GZ_READ && state.state->mode != GZ_WRITE) |
b24e7fce |
546 | return NULL; |
547 | |
548 | /* return error information */ |
549 | if (errnum != NULL) |
648db22b |
550 | *errnum = state.state->err; |
551 | return state.state->err == Z_MEM_ERROR ? "out of memory" : |
552 | (state.state->msg == NULL ? "" : state.state->msg); |
b24e7fce |
553 | } |
554 | |
555 | /* -- see zlib.h -- */ |
556 | void ZEXPORT gzclearerr(file) |
557 | gzFile file; |
558 | { |
559 | gz_statep state; |
560 | |
561 | /* get internal structure and check integrity */ |
562 | if (file == NULL) |
563 | return; |
648db22b |
564 | state.file = file; |
565 | if (state.state->mode != GZ_READ && state.state->mode != GZ_WRITE) |
b24e7fce |
566 | return; |
567 | |
568 | /* clear error and end-of-file */ |
648db22b |
569 | if (state.state->mode == GZ_READ) { |
570 | state.state->eof = 0; |
571 | state.state->past = 0; |
b24e7fce |
572 | } |
573 | gz_error(state, Z_OK, NULL); |
574 | } |
575 | |
648db22b |
576 | /* Create an error message in allocated memory and set state.state->err and |
577 | state.state->msg accordingly. Free any previous error message already there. Do |
b24e7fce |
578 | not try to free or allocate space if the error is Z_MEM_ERROR (out of |
579 | memory). Simply save the error message as a static string. If there is an |
580 | allocation failure constructing the error message, then convert the error to |
581 | out of memory. */ |
582 | void ZLIB_INTERNAL gz_error(state, err, msg) |
583 | gz_statep state; |
584 | int err; |
585 | const char *msg; |
586 | { |
587 | /* free previously allocated message and clear */ |
648db22b |
588 | if (state.state->msg != NULL) { |
589 | if (state.state->err != Z_MEM_ERROR) |
590 | free(state.state->msg); |
591 | state.state->msg = NULL; |
b24e7fce |
592 | } |
593 | |
648db22b |
594 | /* if fatal, set state.state->x.have to 0 so that the gzgetc() macro fails */ |
b24e7fce |
595 | if (err != Z_OK && err != Z_BUF_ERROR) |
648db22b |
596 | state.state->x.have = 0; |
b24e7fce |
597 | |
598 | /* set error code, and if no message, then done */ |
648db22b |
599 | state.state->err = err; |
b24e7fce |
600 | if (msg == NULL) |
601 | return; |
602 | |
603 | /* for an out of memory error, return literal string when requested */ |
604 | if (err == Z_MEM_ERROR) |
605 | return; |
606 | |
607 | /* construct error message with path */ |
648db22b |
608 | if ((state.state->msg = (char *)malloc(strlen(state.state->path) + strlen(msg) + 3)) == |
b24e7fce |
609 | NULL) { |
648db22b |
610 | state.state->err = Z_MEM_ERROR; |
b24e7fce |
611 | return; |
612 | } |
613 | #if !defined(NO_snprintf) && !defined(NO_vsnprintf) |
648db22b |
614 | (void)snprintf(state.state->msg, strlen(state.state->path) + strlen(msg) + 3, |
615 | "%s%s%s", state.state->path, ": ", msg); |
b24e7fce |
616 | #else |
648db22b |
617 | strcpy(state.state->msg, state.state->path); |
618 | strcat(state.state->msg, ": "); |
619 | strcat(state.state->msg, msg); |
b24e7fce |
620 | #endif |
621 | } |
622 | |
623 | #ifndef INT_MAX |
624 | /* portably return maximum value for an int (when limits.h presumed not |
625 | available) -- we need to do this to cover cases where 2's complement not |
626 | used, since C standard permits 1's complement and sign-bit representations, |
627 | otherwise we could just use ((unsigned)-1) >> 1 */ |
628 | unsigned ZLIB_INTERNAL gz_intmax() |
629 | { |
630 | unsigned p, q; |
631 | |
632 | p = 1; |
633 | do { |
634 | q = p; |
635 | p <<= 1; |
636 | p++; |
637 | } while (p > q); |
638 | return q >> 1; |
639 | } |
640 | #endif |