lemon-project-template-glpk
view deps/glpk/src/zlib/gzlib.c @ 9:33de93886c88
Import GLPK 4.47
author | Alpar Juttner <alpar@cs.elte.hu> |
---|---|
date | Sun, 06 Nov 2011 20:59:10 +0100 |
parents | |
children |
line source
1 /* gzlib.c -- zlib functions common to reading and writing gzip files
2 * Copyright (C) 2004, 2010 Mark Adler
3 * For conditions of distribution and use, see copyright notice in zlib.h
4 */
6 #include "gzguts.h"
8 #if defined(_LARGEFILE64_SOURCE) && _LFS64_LARGEFILE-0
9 # define LSEEK lseek64
10 #else
11 # define LSEEK lseek
12 #endif
14 /* Local functions */
15 local void gz_reset OF((gz_statep));
16 local gzFile gz_open OF((const char *, int, const char *));
18 #if defined UNDER_CE
20 /* Map the Windows error number in ERROR to a locale-dependent error message
21 string and return a pointer to it. Typically, the values for ERROR come
22 from GetLastError.
24 The string pointed to shall not be modified by the application, but may be
25 overwritten by a subsequent call to gz_strwinerror
27 The gz_strwinerror function does not change the current setting of
28 GetLastError. */
29 char ZLIB_INTERNAL *gz_strwinerror (error)
30 DWORD error;
31 {
32 static char buf[1024];
34 wchar_t *msgbuf;
35 DWORD lasterr = GetLastError();
36 DWORD chars = FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM
37 | FORMAT_MESSAGE_ALLOCATE_BUFFER,
38 NULL,
39 error,
40 0, /* Default language */
41 (LPVOID)&msgbuf,
42 0,
43 NULL);
44 if (chars != 0) {
45 /* If there is an \r\n appended, zap it. */
46 if (chars >= 2
47 && msgbuf[chars - 2] == '\r' && msgbuf[chars - 1] == '\n') {
48 chars -= 2;
49 msgbuf[chars] = 0;
50 }
52 if (chars > sizeof (buf) - 1) {
53 chars = sizeof (buf) - 1;
54 msgbuf[chars] = 0;
55 }
57 wcstombs(buf, msgbuf, chars + 1);
58 LocalFree(msgbuf);
59 }
60 else {
61 sprintf(buf, "unknown win32 error (%ld)", error);
62 }
64 SetLastError(lasterr);
65 return buf;
66 }
68 #endif /* UNDER_CE */
70 /* Reset gzip file state */
71 local void gz_reset(state)
72 gz_statep state;
73 {
74 if (state->mode == GZ_READ) { /* for reading ... */
75 state->have = 0; /* no output data available */
76 state->eof = 0; /* not at end of file */
77 state->how = LOOK; /* look for gzip header */
78 state->direct = 1; /* default for empty file */
79 }
80 state->seek = 0; /* no seek request pending */
81 gz_error(state, Z_OK, NULL); /* clear error */
82 state->pos = 0; /* no uncompressed data yet */
83 state->strm.avail_in = 0; /* no input data yet */
84 }
86 /* Open a gzip file either by name or file descriptor. */
87 local gzFile gz_open(path, fd, mode)
88 const char *path;
89 int fd;
90 const char *mode;
91 {
92 gz_statep state;
94 /* allocate gzFile structure to return */
95 state = malloc(sizeof(gz_state));
96 if (state == NULL)
97 return NULL;
98 state->size = 0; /* no buffers allocated yet */
99 state->want = GZBUFSIZE; /* requested buffer size */
100 state->msg = NULL; /* no error message yet */
102 /* interpret mode */
103 state->mode = GZ_NONE;
104 state->level = Z_DEFAULT_COMPRESSION;
105 state->strategy = Z_DEFAULT_STRATEGY;
106 while (*mode) {
107 if (*mode >= '0' && *mode <= '9')
108 state->level = *mode - '0';
109 else
110 switch (*mode) {
111 case 'r':
112 state->mode = GZ_READ;
113 break;
114 #ifndef NO_GZCOMPRESS
115 case 'w':
116 state->mode = GZ_WRITE;
117 break;
118 case 'a':
119 state->mode = GZ_APPEND;
120 break;
121 #endif
122 case '+': /* can't read and write at the same time */
123 free(state);
124 return NULL;
125 case 'b': /* ignore -- will request binary anyway */
126 break;
127 case 'f':
128 state->strategy = Z_FILTERED;
129 break;
130 case 'h':
131 state->strategy = Z_HUFFMAN_ONLY;
132 break;
133 case 'R':
134 state->strategy = Z_RLE;
135 break;
136 case 'F':
137 state->strategy = Z_FIXED;
138 default: /* could consider as an error, but just ignore */
139 ;
140 }
141 mode++;
142 }
144 /* must provide an "r", "w", or "a" */
145 if (state->mode == GZ_NONE) {
146 free(state);
147 return NULL;
148 }
150 /* save the path name for error messages */
151 state->path = malloc(strlen(path) + 1);
152 if (state->path == NULL) {
153 free(state);
154 return NULL;
155 }
156 strcpy(state->path, path);
158 /* open the file with the appropriate mode (or just use fd) */
159 state->fd = fd != -1 ? fd :
160 open(path,
161 #ifdef O_LARGEFILE
162 O_LARGEFILE |
163 #endif
164 #ifdef O_BINARY
165 O_BINARY |
166 #endif
167 (state->mode == GZ_READ ?
168 O_RDONLY :
169 (O_WRONLY | O_CREAT | (
170 state->mode == GZ_WRITE ?
171 O_TRUNC :
172 O_APPEND))),
173 0666);
174 if (state->fd == -1) {
175 free(state->path);
176 free(state);
177 return NULL;
178 }
179 if (state->mode == GZ_APPEND)
180 state->mode = GZ_WRITE; /* simplify later checks */
182 /* save the current position for rewinding (only if reading) */
183 if (state->mode == GZ_READ) {
184 state->start = LSEEK(state->fd, 0, SEEK_CUR);
185 if (state->start == -1) state->start = 0;
186 }
188 /* initialize stream */
189 gz_reset(state);
191 /* return stream */
192 return (gzFile)state;
193 }
195 /* -- see zlib.h -- */
196 gzFile ZEXPORT gzopen(path, mode)
197 const char *path;
198 const char *mode;
199 {
200 return gz_open(path, -1, mode);
201 }
203 /* -- see zlib.h -- */
204 gzFile ZEXPORT gzopen64(path, mode)
205 const char *path;
206 const char *mode;
207 {
208 return gz_open(path, -1, mode);
209 }
211 /* -- see zlib.h -- */
212 gzFile ZEXPORT gzdopen(fd, mode)
213 int fd;
214 const char *mode;
215 {
216 char *path; /* identifier for error messages */
217 gzFile gz;
219 if (fd == -1 || (path = malloc(7 + 3 * sizeof(int))) == NULL)
220 return NULL;
221 sprintf(path, "<fd:%d>", fd); /* for debugging */
222 gz = gz_open(path, fd, mode);
223 free(path);
224 return gz;
225 }
227 /* -- see zlib.h -- */
228 int ZEXPORT gzbuffer(file, size)
229 gzFile file;
230 unsigned size;
231 {
232 gz_statep state;
234 /* get internal structure and check integrity */
235 if (file == NULL)
236 return -1;
237 state = (gz_statep)file;
238 if (state->mode != GZ_READ && state->mode != GZ_WRITE)
239 return -1;
241 /* make sure we haven't already allocated memory */
242 if (state->size != 0)
243 return -1;
245 /* check and set requested size */
246 if (size == 0)
247 return -1;
248 state->want = size;
249 return 0;
250 }
252 /* -- see zlib.h -- */
253 int ZEXPORT gzrewind(file)
254 gzFile file;
255 {
256 gz_statep state;
258 /* get internal structure */
259 if (file == NULL)
260 return -1;
261 state = (gz_statep)file;
263 /* check that we're reading and that there's no error */
264 if (state->mode != GZ_READ || state->err != Z_OK)
265 return -1;
267 /* back up and start over */
268 if (LSEEK(state->fd, state->start, SEEK_SET) == -1)
269 return -1;
270 gz_reset(state);
271 return 0;
272 }
274 /* -- see zlib.h -- */
275 z_off64_t ZEXPORT gzseek64(file, offset, whence)
276 gzFile file;
277 z_off64_t offset;
278 int whence;
279 {
280 unsigned n;
281 z_off64_t ret;
282 gz_statep state;
284 /* get internal structure and check integrity */
285 if (file == NULL)
286 return -1;
287 state = (gz_statep)file;
288 if (state->mode != GZ_READ && state->mode != GZ_WRITE)
289 return -1;
291 /* check that there's no error */
292 if (state->err != Z_OK)
293 return -1;
295 /* can only seek from start or relative to current position */
296 if (whence != SEEK_SET && whence != SEEK_CUR)
297 return -1;
299 /* normalize offset to a SEEK_CUR specification */
300 if (whence == SEEK_SET)
301 offset -= state->pos;
302 else if (state->seek)
303 offset += state->skip;
304 state->seek = 0;
306 /* if within raw area while reading, just go there */
307 if (state->mode == GZ_READ && state->how == COPY &&
308 state->pos + offset >= state->raw) {
309 ret = LSEEK(state->fd, offset - state->have, SEEK_CUR);
310 if (ret == -1)
311 return -1;
312 state->have = 0;
313 state->eof = 0;
314 state->seek = 0;
315 gz_error(state, Z_OK, NULL);
316 state->strm.avail_in = 0;
317 state->pos += offset;
318 return state->pos;
319 }
321 /* calculate skip amount, rewinding if needed for back seek when reading */
322 if (offset < 0) {
323 if (state->mode != GZ_READ) /* writing -- can't go backwards */
324 return -1;
325 offset += state->pos;
326 if (offset < 0) /* before start of file! */
327 return -1;
328 if (gzrewind(file) == -1) /* rewind, then skip to offset */
329 return -1;
330 }
332 /* if reading, skip what's in output buffer (one less gzgetc() check) */
333 if (state->mode == GZ_READ) {
334 n = GT_OFF(state->have) || (z_off64_t)state->have > offset ?
335 (unsigned)offset : state->have;
336 state->have -= n;
337 state->next += n;
338 state->pos += n;
339 offset -= n;
340 }
342 /* request skip (if not zero) */
343 if (offset) {
344 state->seek = 1;
345 state->skip = offset;
346 }
347 return state->pos + offset;
348 }
350 /* -- see zlib.h -- */
351 z_off_t ZEXPORT gzseek(file, offset, whence)
352 gzFile file;
353 z_off_t offset;
354 int whence;
355 {
356 z_off64_t ret;
358 ret = gzseek64(file, (z_off64_t)offset, whence);
359 return ret == (z_off_t)ret ? (z_off_t)ret : -1;
360 }
362 /* -- see zlib.h -- */
363 z_off64_t ZEXPORT gztell64(file)
364 gzFile file;
365 {
366 gz_statep state;
368 /* get internal structure and check integrity */
369 if (file == NULL)
370 return -1;
371 state = (gz_statep)file;
372 if (state->mode != GZ_READ && state->mode != GZ_WRITE)
373 return -1;
375 /* return position */
376 return state->pos + (state->seek ? state->skip : 0);
377 }
379 /* -- see zlib.h -- */
380 z_off_t ZEXPORT gztell(file)
381 gzFile file;
382 {
383 z_off64_t ret;
385 ret = gztell64(file);
386 return ret == (z_off_t)ret ? (z_off_t)ret : -1;
387 }
389 /* -- see zlib.h -- */
390 z_off64_t ZEXPORT gzoffset64(file)
391 gzFile file;
392 {
393 z_off64_t offset;
394 gz_statep state;
396 /* get internal structure and check integrity */
397 if (file == NULL)
398 return -1;
399 state = (gz_statep)file;
400 if (state->mode != GZ_READ && state->mode != GZ_WRITE)
401 return -1;
403 /* compute and return effective offset in file */
404 offset = LSEEK(state->fd, 0, SEEK_CUR);
405 if (offset == -1)
406 return -1;
407 if (state->mode == GZ_READ) /* reading */
408 offset -= state->strm.avail_in; /* don't count buffered input */
409 return offset;
410 }
412 /* -- see zlib.h -- */
413 z_off_t ZEXPORT gzoffset(file)
414 gzFile file;
415 {
416 z_off64_t ret;
418 ret = gzoffset64(file);
419 return ret == (z_off_t)ret ? (z_off_t)ret : -1;
420 }
422 /* -- see zlib.h -- */
423 int ZEXPORT gzeof(file)
424 gzFile file;
425 {
426 gz_statep state;
428 /* get internal structure and check integrity */
429 if (file == NULL)
430 return 0;
431 state = (gz_statep)file;
432 if (state->mode != GZ_READ && state->mode != GZ_WRITE)
433 return 0;
435 /* return end-of-file state */
436 return state->mode == GZ_READ ?
437 (state->eof && state->strm.avail_in == 0 && state->have == 0) : 0;
438 }
440 /* -- see zlib.h -- */
441 const char * ZEXPORT gzerror(file, errnum)
442 gzFile file;
443 int *errnum;
444 {
445 gz_statep state;
447 /* get internal structure and check integrity */
448 if (file == NULL)
449 return NULL;
450 state = (gz_statep)file;
451 if (state->mode != GZ_READ && state->mode != GZ_WRITE)
452 return NULL;
454 /* return error information */
455 if (errnum != NULL)
456 *errnum = state->err;
457 return state->msg == NULL ? "" : state->msg;
458 }
460 /* -- see zlib.h -- */
461 void ZEXPORT gzclearerr(file)
462 gzFile file;
463 {
464 gz_statep state;
466 /* get internal structure and check integrity */
467 if (file == NULL)
468 return;
469 state = (gz_statep)file;
470 if (state->mode != GZ_READ && state->mode != GZ_WRITE)
471 return;
473 /* clear error and end-of-file */
474 if (state->mode == GZ_READ)
475 state->eof = 0;
476 gz_error(state, Z_OK, NULL);
477 }
479 /* Create an error message in allocated memory and set state->err and
480 state->msg accordingly. Free any previous error message already there. Do
481 not try to free or allocate space if the error is Z_MEM_ERROR (out of
482 memory). Simply save the error message as a static string. If there is an
483 allocation failure constructing the error message, then convert the error to
484 out of memory. */
485 void ZLIB_INTERNAL gz_error(state, err, msg)
486 gz_statep state;
487 int err;
488 const char *msg;
489 {
490 /* free previously allocated message and clear */
491 if (state->msg != NULL) {
492 if (state->err != Z_MEM_ERROR)
493 free(state->msg);
494 state->msg = NULL;
495 }
497 /* set error code, and if no message, then done */
498 state->err = err;
499 if (msg == NULL)
500 return;
502 /* for an out of memory error, save as static string */
503 if (err == Z_MEM_ERROR) {
504 state->msg = (char *)msg;
505 return;
506 }
508 /* construct error message with path */
509 if ((state->msg = malloc(strlen(state->path) + strlen(msg) + 3)) == NULL) {
510 state->err = Z_MEM_ERROR;
511 state->msg = (char *)"out of memory";
512 return;
513 }
514 strcpy(state->msg, state->path);
515 strcat(state->msg, ": ");
516 strcat(state->msg, msg);
517 return;
518 }
520 #ifndef INT_MAX
521 /* portably return maximum value for an int (when limits.h presumed not
522 available) -- we need to do this to cover cases where 2's complement not
523 used, since C standard permits 1's complement and sign-bit representations,
524 otherwise we could just use ((unsigned)-1) >> 1 */
525 unsigned ZLIB_INTERNAL gz_intmax()
526 {
527 unsigned p, q;
529 p = 1;
530 do {
531 q = p;
532 p <<= 1;
533 p++;
534 } while (p > q);
535 return q >> 1;
536 }
537 #endif