Mercurial > hg > CbC > CbC_gcc
comparison zlib/gzio.c @ 51:ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
author | kent <kent@cr.ie.u-ryukyu.ac.jp> |
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date | Sun, 07 Feb 2010 18:27:48 +0900 |
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47:3bfb6c00c1e0 | 51:ae3a4bfb450b |
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1 /* gzio.c -- IO on .gz files | |
2 * Copyright (C) 1995-2005 Jean-loup Gailly. | |
3 * For conditions of distribution and use, see copyright notice in zlib.h | |
4 * | |
5 * Compile this file with -DNO_GZCOMPRESS to avoid the compression code. | |
6 */ | |
7 | |
8 /* @(#) $Id: gzio.c,v 1.1.1.2 2002/03/11 21:53:24 tromey Exp $ */ | |
9 | |
10 #include <stdio.h> | |
11 | |
12 #include "zutil.h" | |
13 | |
14 #ifdef NO_DEFLATE /* for compatibility with old definition */ | |
15 # define NO_GZCOMPRESS | |
16 #endif | |
17 | |
18 #ifndef NO_DUMMY_DECL | |
19 struct internal_state {int dummy;}; /* for buggy compilers */ | |
20 #endif | |
21 | |
22 #ifndef Z_BUFSIZE | |
23 # ifdef MAXSEG_64K | |
24 # define Z_BUFSIZE 4096 /* minimize memory usage for 16-bit DOS */ | |
25 # else | |
26 # define Z_BUFSIZE 16384 | |
27 # endif | |
28 #endif | |
29 #ifndef Z_PRINTF_BUFSIZE | |
30 # define Z_PRINTF_BUFSIZE 4096 | |
31 #endif | |
32 | |
33 #ifdef __MVS__ | |
34 # pragma map (fdopen , "\174\174FDOPEN") | |
35 FILE *fdopen(int, const char *); | |
36 #endif | |
37 | |
38 #ifndef STDC | |
39 extern voidp malloc OF((uInt size)); | |
40 extern void free OF((voidpf ptr)); | |
41 #endif | |
42 | |
43 #define ALLOC(size) malloc(size) | |
44 #define TRYFREE(p) {if (p) free(p);} | |
45 | |
46 static int const gz_magic[2] = {0x1f, 0x8b}; /* gzip magic header */ | |
47 | |
48 /* gzip flag byte */ | |
49 #define ASCII_FLAG 0x01 /* bit 0 set: file probably ascii text */ | |
50 #define HEAD_CRC 0x02 /* bit 1 set: header CRC present */ | |
51 #define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */ | |
52 #define ORIG_NAME 0x08 /* bit 3 set: original file name present */ | |
53 #define COMMENT 0x10 /* bit 4 set: file comment present */ | |
54 #define RESERVED 0xE0 /* bits 5..7: reserved */ | |
55 | |
56 typedef struct gz_stream { | |
57 z_stream stream; | |
58 int z_err; /* error code for last stream operation */ | |
59 int z_eof; /* set if end of input file */ | |
60 FILE *file; /* .gz file */ | |
61 Byte *inbuf; /* input buffer */ | |
62 Byte *outbuf; /* output buffer */ | |
63 uLong crc; /* crc32 of uncompressed data */ | |
64 char *msg; /* error message */ | |
65 char *path; /* path name for debugging only */ | |
66 int transparent; /* 1 if input file is not a .gz file */ | |
67 char mode; /* 'w' or 'r' */ | |
68 z_off_t start; /* start of compressed data in file (header skipped) */ | |
69 z_off_t in; /* bytes into deflate or inflate */ | |
70 z_off_t out; /* bytes out of deflate or inflate */ | |
71 int back; /* one character push-back */ | |
72 int last; /* true if push-back is last character */ | |
73 } gz_stream; | |
74 | |
75 | |
76 local gzFile gz_open OF((const char *path, const char *mode, int fd)); | |
77 local int do_flush OF((gzFile file, int flush)); | |
78 local int get_byte OF((gz_stream *s)); | |
79 local void check_header OF((gz_stream *s)); | |
80 local int destroy OF((gz_stream *s)); | |
81 local void putLong OF((FILE *file, uLong x)); | |
82 local uLong getLong OF((gz_stream *s)); | |
83 | |
84 /* =========================================================================== | |
85 Opens a gzip (.gz) file for reading or writing. The mode parameter | |
86 is as in fopen ("rb" or "wb"). The file is given either by file descriptor | |
87 or path name (if fd == -1). | |
88 gz_open returns NULL if the file could not be opened or if there was | |
89 insufficient memory to allocate the (de)compression state; errno | |
90 can be checked to distinguish the two cases (if errno is zero, the | |
91 zlib error is Z_MEM_ERROR). | |
92 */ | |
93 local gzFile gz_open (path, mode, fd) | |
94 const char *path; | |
95 const char *mode; | |
96 int fd; | |
97 { | |
98 int err; | |
99 int level = Z_DEFAULT_COMPRESSION; /* compression level */ | |
100 int strategy = Z_DEFAULT_STRATEGY; /* compression strategy */ | |
101 char *p = (char*)mode; | |
102 gz_stream *s; | |
103 char fmode[80]; /* copy of mode, without the compression level */ | |
104 char *m = fmode; | |
105 | |
106 if (!path || !mode) return Z_NULL; | |
107 | |
108 s = (gz_stream *)ALLOC(sizeof(gz_stream)); | |
109 if (!s) return Z_NULL; | |
110 | |
111 s->stream.zalloc = (alloc_func)0; | |
112 s->stream.zfree = (free_func)0; | |
113 s->stream.opaque = (voidpf)0; | |
114 s->stream.next_in = s->inbuf = Z_NULL; | |
115 s->stream.next_out = s->outbuf = Z_NULL; | |
116 s->stream.avail_in = s->stream.avail_out = 0; | |
117 s->file = NULL; | |
118 s->z_err = Z_OK; | |
119 s->z_eof = 0; | |
120 s->in = 0; | |
121 s->out = 0; | |
122 s->back = EOF; | |
123 s->crc = crc32(0L, Z_NULL, 0); | |
124 s->msg = NULL; | |
125 s->transparent = 0; | |
126 | |
127 s->path = (char*)ALLOC(strlen(path)+1); | |
128 if (s->path == NULL) { | |
129 return destroy(s), (gzFile)Z_NULL; | |
130 } | |
131 strcpy(s->path, path); /* do this early for debugging */ | |
132 | |
133 s->mode = '\0'; | |
134 do { | |
135 if (*p == 'r') s->mode = 'r'; | |
136 if (*p == 'w' || *p == 'a') s->mode = 'w'; | |
137 if (*p >= '0' && *p <= '9') { | |
138 level = *p - '0'; | |
139 } else if (*p == 'f') { | |
140 strategy = Z_FILTERED; | |
141 } else if (*p == 'h') { | |
142 strategy = Z_HUFFMAN_ONLY; | |
143 } else if (*p == 'R') { | |
144 strategy = Z_RLE; | |
145 } else { | |
146 *m++ = *p; /* copy the mode */ | |
147 } | |
148 } while (*p++ && m != fmode + sizeof(fmode)); | |
149 if (s->mode == '\0') return destroy(s), (gzFile)Z_NULL; | |
150 | |
151 if (s->mode == 'w') { | |
152 #ifdef NO_GZCOMPRESS | |
153 err = Z_STREAM_ERROR; | |
154 #else | |
155 err = deflateInit2(&(s->stream), level, | |
156 Z_DEFLATED, -MAX_WBITS, DEF_MEM_LEVEL, strategy); | |
157 /* windowBits is passed < 0 to suppress zlib header */ | |
158 | |
159 s->stream.next_out = s->outbuf = (Byte*)ALLOC(Z_BUFSIZE); | |
160 #endif | |
161 if (err != Z_OK || s->outbuf == Z_NULL) { | |
162 return destroy(s), (gzFile)Z_NULL; | |
163 } | |
164 } else { | |
165 s->stream.next_in = s->inbuf = (Byte*)ALLOC(Z_BUFSIZE); | |
166 | |
167 err = inflateInit2(&(s->stream), -MAX_WBITS); | |
168 /* windowBits is passed < 0 to tell that there is no zlib header. | |
169 * Note that in this case inflate *requires* an extra "dummy" byte | |
170 * after the compressed stream in order to complete decompression and | |
171 * return Z_STREAM_END. Here the gzip CRC32 ensures that 4 bytes are | |
172 * present after the compressed stream. | |
173 */ | |
174 if (err != Z_OK || s->inbuf == Z_NULL) { | |
175 return destroy(s), (gzFile)Z_NULL; | |
176 } | |
177 } | |
178 s->stream.avail_out = Z_BUFSIZE; | |
179 | |
180 errno = 0; | |
181 s->file = fd < 0 ? F_OPEN(path, fmode) : (FILE*)fdopen(fd, fmode); | |
182 | |
183 if (s->file == NULL) { | |
184 return destroy(s), (gzFile)Z_NULL; | |
185 } | |
186 if (s->mode == 'w') { | |
187 /* Write a very simple .gz header: | |
188 */ | |
189 fprintf(s->file, "%c%c%c%c%c%c%c%c%c%c", gz_magic[0], gz_magic[1], | |
190 Z_DEFLATED, 0 /*flags*/, 0,0,0,0 /*time*/, 0 /*xflags*/, OS_CODE); | |
191 s->start = 10L; | |
192 /* We use 10L instead of ftell(s->file) to because ftell causes an | |
193 * fflush on some systems. This version of the library doesn't use | |
194 * start anyway in write mode, so this initialization is not | |
195 * necessary. | |
196 */ | |
197 } else { | |
198 check_header(s); /* skip the .gz header */ | |
199 s->start = ftell(s->file) - s->stream.avail_in; | |
200 } | |
201 | |
202 return (gzFile)s; | |
203 } | |
204 | |
205 /* =========================================================================== | |
206 Opens a gzip (.gz) file for reading or writing. | |
207 */ | |
208 gzFile ZEXPORT gzopen (path, mode) | |
209 const char *path; | |
210 const char *mode; | |
211 { | |
212 return gz_open (path, mode, -1); | |
213 } | |
214 | |
215 /* =========================================================================== | |
216 Associate a gzFile with the file descriptor fd. fd is not dup'ed here | |
217 to mimic the behavio(u)r of fdopen. | |
218 */ | |
219 gzFile ZEXPORT gzdopen (fd, mode) | |
220 int fd; | |
221 const char *mode; | |
222 { | |
223 char name[46]; /* allow for up to 128-bit integers */ | |
224 | |
225 if (fd < 0) return (gzFile)Z_NULL; | |
226 sprintf(name, "<fd:%d>", fd); /* for debugging */ | |
227 | |
228 return gz_open (name, mode, fd); | |
229 } | |
230 | |
231 /* =========================================================================== | |
232 * Update the compression level and strategy | |
233 */ | |
234 int ZEXPORT gzsetparams (file, level, strategy) | |
235 gzFile file; | |
236 int level; | |
237 int strategy; | |
238 { | |
239 gz_stream *s = (gz_stream*)file; | |
240 | |
241 if (s == NULL || s->mode != 'w') return Z_STREAM_ERROR; | |
242 | |
243 /* Make room to allow flushing */ | |
244 if (s->stream.avail_out == 0) { | |
245 | |
246 s->stream.next_out = s->outbuf; | |
247 if (fwrite(s->outbuf, 1, Z_BUFSIZE, s->file) != Z_BUFSIZE) { | |
248 s->z_err = Z_ERRNO; | |
249 } | |
250 s->stream.avail_out = Z_BUFSIZE; | |
251 } | |
252 | |
253 return deflateParams (&(s->stream), level, strategy); | |
254 } | |
255 | |
256 /* =========================================================================== | |
257 Read a byte from a gz_stream; update next_in and avail_in. Return EOF | |
258 for end of file. | |
259 IN assertion: the stream s has been sucessfully opened for reading. | |
260 */ | |
261 local int get_byte(s) | |
262 gz_stream *s; | |
263 { | |
264 if (s->z_eof) return EOF; | |
265 if (s->stream.avail_in == 0) { | |
266 errno = 0; | |
267 s->stream.avail_in = (uInt)fread(s->inbuf, 1, Z_BUFSIZE, s->file); | |
268 if (s->stream.avail_in == 0) { | |
269 s->z_eof = 1; | |
270 if (ferror(s->file)) s->z_err = Z_ERRNO; | |
271 return EOF; | |
272 } | |
273 s->stream.next_in = s->inbuf; | |
274 } | |
275 s->stream.avail_in--; | |
276 return *(s->stream.next_in)++; | |
277 } | |
278 | |
279 /* =========================================================================== | |
280 Check the gzip header of a gz_stream opened for reading. Set the stream | |
281 mode to transparent if the gzip magic header is not present; set s->err | |
282 to Z_DATA_ERROR if the magic header is present but the rest of the header | |
283 is incorrect. | |
284 IN assertion: the stream s has already been created sucessfully; | |
285 s->stream.avail_in is zero for the first time, but may be non-zero | |
286 for concatenated .gz files. | |
287 */ | |
288 local void check_header(s) | |
289 gz_stream *s; | |
290 { | |
291 int method; /* method byte */ | |
292 int flags; /* flags byte */ | |
293 uInt len; | |
294 int c; | |
295 | |
296 /* Assure two bytes in the buffer so we can peek ahead -- handle case | |
297 where first byte of header is at the end of the buffer after the last | |
298 gzip segment */ | |
299 len = s->stream.avail_in; | |
300 if (len < 2) { | |
301 if (len) s->inbuf[0] = s->stream.next_in[0]; | |
302 errno = 0; | |
303 len = (uInt)fread(s->inbuf + len, 1, Z_BUFSIZE >> len, s->file); | |
304 if (len == 0 && ferror(s->file)) s->z_err = Z_ERRNO; | |
305 s->stream.avail_in += len; | |
306 s->stream.next_in = s->inbuf; | |
307 if (s->stream.avail_in < 2) { | |
308 s->transparent = s->stream.avail_in; | |
309 return; | |
310 } | |
311 } | |
312 | |
313 /* Peek ahead to check the gzip magic header */ | |
314 if (s->stream.next_in[0] != gz_magic[0] || | |
315 s->stream.next_in[1] != gz_magic[1]) { | |
316 s->transparent = 1; | |
317 return; | |
318 } | |
319 s->stream.avail_in -= 2; | |
320 s->stream.next_in += 2; | |
321 | |
322 /* Check the rest of the gzip header */ | |
323 method = get_byte(s); | |
324 flags = get_byte(s); | |
325 if (method != Z_DEFLATED || (flags & RESERVED) != 0) { | |
326 s->z_err = Z_DATA_ERROR; | |
327 return; | |
328 } | |
329 | |
330 /* Discard time, xflags and OS code: */ | |
331 for (len = 0; len < 6; len++) (void)get_byte(s); | |
332 | |
333 if ((flags & EXTRA_FIELD) != 0) { /* skip the extra field */ | |
334 len = (uInt)get_byte(s); | |
335 len += ((uInt)get_byte(s))<<8; | |
336 /* len is garbage if EOF but the loop below will quit anyway */ | |
337 while (len-- != 0 && get_byte(s) != EOF) ; | |
338 } | |
339 if ((flags & ORIG_NAME) != 0) { /* skip the original file name */ | |
340 while ((c = get_byte(s)) != 0 && c != EOF) ; | |
341 } | |
342 if ((flags & COMMENT) != 0) { /* skip the .gz file comment */ | |
343 while ((c = get_byte(s)) != 0 && c != EOF) ; | |
344 } | |
345 if ((flags & HEAD_CRC) != 0) { /* skip the header crc */ | |
346 for (len = 0; len < 2; len++) (void)get_byte(s); | |
347 } | |
348 s->z_err = s->z_eof ? Z_DATA_ERROR : Z_OK; | |
349 } | |
350 | |
351 /* =========================================================================== | |
352 * Cleanup then free the given gz_stream. Return a zlib error code. | |
353 Try freeing in the reverse order of allocations. | |
354 */ | |
355 local int destroy (s) | |
356 gz_stream *s; | |
357 { | |
358 int err = Z_OK; | |
359 | |
360 if (!s) return Z_STREAM_ERROR; | |
361 | |
362 TRYFREE(s->msg); | |
363 | |
364 if (s->stream.state != NULL) { | |
365 if (s->mode == 'w') { | |
366 #ifdef NO_GZCOMPRESS | |
367 err = Z_STREAM_ERROR; | |
368 #else | |
369 err = deflateEnd(&(s->stream)); | |
370 #endif | |
371 } else if (s->mode == 'r') { | |
372 err = inflateEnd(&(s->stream)); | |
373 } | |
374 } | |
375 if (s->file != NULL && fclose(s->file)) { | |
376 #ifdef ESPIPE | |
377 if (errno != ESPIPE) /* fclose is broken for pipes in HP/UX */ | |
378 #endif | |
379 err = Z_ERRNO; | |
380 } | |
381 if (s->z_err < 0) err = s->z_err; | |
382 | |
383 TRYFREE(s->inbuf); | |
384 TRYFREE(s->outbuf); | |
385 TRYFREE(s->path); | |
386 TRYFREE(s); | |
387 return err; | |
388 } | |
389 | |
390 /* =========================================================================== | |
391 Reads the given number of uncompressed bytes from the compressed file. | |
392 gzread returns the number of bytes actually read (0 for end of file). | |
393 */ | |
394 int ZEXPORT gzread (file, buf, len) | |
395 gzFile file; | |
396 voidp buf; | |
397 unsigned len; | |
398 { | |
399 gz_stream *s = (gz_stream*)file; | |
400 Bytef *start = (Bytef*)buf; /* starting point for crc computation */ | |
401 Byte *next_out; /* == stream.next_out but not forced far (for MSDOS) */ | |
402 | |
403 if (s == NULL || s->mode != 'r') return Z_STREAM_ERROR; | |
404 | |
405 if (s->z_err == Z_DATA_ERROR || s->z_err == Z_ERRNO) return -1; | |
406 if (s->z_err == Z_STREAM_END) return 0; /* EOF */ | |
407 | |
408 next_out = (Byte*)buf; | |
409 s->stream.next_out = (Bytef*)buf; | |
410 s->stream.avail_out = len; | |
411 | |
412 if (s->stream.avail_out && s->back != EOF) { | |
413 *next_out++ = s->back; | |
414 s->stream.next_out++; | |
415 s->stream.avail_out--; | |
416 s->back = EOF; | |
417 s->out++; | |
418 start++; | |
419 if (s->last) { | |
420 s->z_err = Z_STREAM_END; | |
421 return 1; | |
422 } | |
423 } | |
424 | |
425 while (s->stream.avail_out != 0) { | |
426 | |
427 if (s->transparent) { | |
428 /* Copy first the lookahead bytes: */ | |
429 uInt n = s->stream.avail_in; | |
430 if (n > s->stream.avail_out) n = s->stream.avail_out; | |
431 if (n > 0) { | |
432 zmemcpy(s->stream.next_out, s->stream.next_in, n); | |
433 next_out += n; | |
434 s->stream.next_out = next_out; | |
435 s->stream.next_in += n; | |
436 s->stream.avail_out -= n; | |
437 s->stream.avail_in -= n; | |
438 } | |
439 if (s->stream.avail_out > 0) { | |
440 s->stream.avail_out -= | |
441 (uInt)fread(next_out, 1, s->stream.avail_out, s->file); | |
442 } | |
443 len -= s->stream.avail_out; | |
444 s->in += len; | |
445 s->out += len; | |
446 if (len == 0) s->z_eof = 1; | |
447 return (int)len; | |
448 } | |
449 if (s->stream.avail_in == 0 && !s->z_eof) { | |
450 | |
451 errno = 0; | |
452 s->stream.avail_in = (uInt)fread(s->inbuf, 1, Z_BUFSIZE, s->file); | |
453 if (s->stream.avail_in == 0) { | |
454 s->z_eof = 1; | |
455 if (ferror(s->file)) { | |
456 s->z_err = Z_ERRNO; | |
457 break; | |
458 } | |
459 } | |
460 s->stream.next_in = s->inbuf; | |
461 } | |
462 s->in += s->stream.avail_in; | |
463 s->out += s->stream.avail_out; | |
464 s->z_err = inflate(&(s->stream), Z_NO_FLUSH); | |
465 s->in -= s->stream.avail_in; | |
466 s->out -= s->stream.avail_out; | |
467 | |
468 if (s->z_err == Z_STREAM_END) { | |
469 /* Check CRC and original size */ | |
470 s->crc = crc32(s->crc, start, (uInt)(s->stream.next_out - start)); | |
471 start = s->stream.next_out; | |
472 | |
473 if (getLong(s) != s->crc) { | |
474 s->z_err = Z_DATA_ERROR; | |
475 } else { | |
476 (void)getLong(s); | |
477 /* The uncompressed length returned by above getlong() may be | |
478 * different from s->out in case of concatenated .gz files. | |
479 * Check for such files: | |
480 */ | |
481 check_header(s); | |
482 if (s->z_err == Z_OK) { | |
483 inflateReset(&(s->stream)); | |
484 s->crc = crc32(0L, Z_NULL, 0); | |
485 } | |
486 } | |
487 } | |
488 if (s->z_err != Z_OK || s->z_eof) break; | |
489 } | |
490 s->crc = crc32(s->crc, start, (uInt)(s->stream.next_out - start)); | |
491 | |
492 if (len == s->stream.avail_out && | |
493 (s->z_err == Z_DATA_ERROR || s->z_err == Z_ERRNO)) | |
494 return -1; | |
495 return (int)(len - s->stream.avail_out); | |
496 } | |
497 | |
498 | |
499 /* =========================================================================== | |
500 Reads one byte from the compressed file. gzgetc returns this byte | |
501 or -1 in case of end of file or error. | |
502 */ | |
503 int ZEXPORT gzgetc(file) | |
504 gzFile file; | |
505 { | |
506 unsigned char c; | |
507 | |
508 return gzread(file, &c, 1) == 1 ? c : -1; | |
509 } | |
510 | |
511 | |
512 /* =========================================================================== | |
513 Push one byte back onto the stream. | |
514 */ | |
515 int ZEXPORT gzungetc(c, file) | |
516 int c; | |
517 gzFile file; | |
518 { | |
519 gz_stream *s = (gz_stream*)file; | |
520 | |
521 if (s == NULL || s->mode != 'r' || c == EOF || s->back != EOF) return EOF; | |
522 s->back = c; | |
523 s->out--; | |
524 s->last = (s->z_err == Z_STREAM_END); | |
525 if (s->last) s->z_err = Z_OK; | |
526 s->z_eof = 0; | |
527 return c; | |
528 } | |
529 | |
530 | |
531 /* =========================================================================== | |
532 Reads bytes from the compressed file until len-1 characters are | |
533 read, or a newline character is read and transferred to buf, or an | |
534 end-of-file condition is encountered. The string is then terminated | |
535 with a null character. | |
536 gzgets returns buf, or Z_NULL in case of error. | |
537 | |
538 The current implementation is not optimized at all. | |
539 */ | |
540 char * ZEXPORT gzgets(file, buf, len) | |
541 gzFile file; | |
542 char *buf; | |
543 int len; | |
544 { | |
545 char *b = buf; | |
546 if (buf == Z_NULL || len <= 0) return Z_NULL; | |
547 | |
548 while (--len > 0 && gzread(file, buf, 1) == 1 && *buf++ != '\n') ; | |
549 *buf = '\0'; | |
550 return b == buf && len > 0 ? Z_NULL : b; | |
551 } | |
552 | |
553 | |
554 #ifndef NO_GZCOMPRESS | |
555 /* =========================================================================== | |
556 Writes the given number of uncompressed bytes into the compressed file. | |
557 gzwrite returns the number of bytes actually written (0 in case of error). | |
558 */ | |
559 int ZEXPORT gzwrite (file, buf, len) | |
560 gzFile file; | |
561 voidpc buf; | |
562 unsigned len; | |
563 { | |
564 gz_stream *s = (gz_stream*)file; | |
565 | |
566 if (s == NULL || s->mode != 'w') return Z_STREAM_ERROR; | |
567 | |
568 s->stream.next_in = (Bytef*)buf; | |
569 s->stream.avail_in = len; | |
570 | |
571 while (s->stream.avail_in != 0) { | |
572 | |
573 if (s->stream.avail_out == 0) { | |
574 | |
575 s->stream.next_out = s->outbuf; | |
576 if (fwrite(s->outbuf, 1, Z_BUFSIZE, s->file) != Z_BUFSIZE) { | |
577 s->z_err = Z_ERRNO; | |
578 break; | |
579 } | |
580 s->stream.avail_out = Z_BUFSIZE; | |
581 } | |
582 s->in += s->stream.avail_in; | |
583 s->out += s->stream.avail_out; | |
584 s->z_err = deflate(&(s->stream), Z_NO_FLUSH); | |
585 s->in -= s->stream.avail_in; | |
586 s->out -= s->stream.avail_out; | |
587 if (s->z_err != Z_OK) break; | |
588 } | |
589 s->crc = crc32(s->crc, (const Bytef *)buf, len); | |
590 | |
591 return (int)(len - s->stream.avail_in); | |
592 } | |
593 | |
594 | |
595 /* =========================================================================== | |
596 Converts, formats, and writes the args to the compressed file under | |
597 control of the format string, as in fprintf. gzprintf returns the number of | |
598 uncompressed bytes actually written (0 in case of error). | |
599 */ | |
600 #ifdef STDC | |
601 #include <stdarg.h> | |
602 | |
603 int ZEXPORTVA gzprintf (gzFile file, const char *format, /* args */ ...) | |
604 { | |
605 char buf[Z_PRINTF_BUFSIZE]; | |
606 va_list va; | |
607 int len; | |
608 | |
609 buf[sizeof(buf) - 1] = 0; | |
610 va_start(va, format); | |
611 #ifdef NO_vsnprintf | |
612 # ifdef HAS_vsprintf_void | |
613 (void)vsprintf(buf, format, va); | |
614 va_end(va); | |
615 for (len = 0; len < sizeof(buf); len++) | |
616 if (buf[len] == 0) break; | |
617 # else | |
618 len = vsprintf(buf, format, va); | |
619 va_end(va); | |
620 # endif | |
621 #else | |
622 # ifdef HAS_vsnprintf_void | |
623 (void)vsnprintf(buf, sizeof(buf), format, va); | |
624 va_end(va); | |
625 len = strlen(buf); | |
626 # else | |
627 len = vsnprintf(buf, sizeof(buf), format, va); | |
628 va_end(va); | |
629 # endif | |
630 #endif | |
631 if (len <= 0 || len >= (int)sizeof(buf) || buf[sizeof(buf) - 1] != 0) | |
632 return 0; | |
633 return gzwrite(file, buf, (unsigned)len); | |
634 } | |
635 #else /* not ANSI C */ | |
636 | |
637 int ZEXPORTVA gzprintf (file, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, | |
638 a11, a12, a13, a14, a15, a16, a17, a18, a19, a20) | |
639 gzFile file; | |
640 const char *format; | |
641 int a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, | |
642 a11, a12, a13, a14, a15, a16, a17, a18, a19, a20; | |
643 { | |
644 char buf[Z_PRINTF_BUFSIZE]; | |
645 int len; | |
646 | |
647 buf[sizeof(buf) - 1] = 0; | |
648 #ifdef NO_snprintf | |
649 # ifdef HAS_sprintf_void | |
650 sprintf(buf, format, a1, a2, a3, a4, a5, a6, a7, a8, | |
651 a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20); | |
652 for (len = 0; len < sizeof(buf); len++) | |
653 if (buf[len] == 0) break; | |
654 # else | |
655 len = sprintf(buf, format, a1, a2, a3, a4, a5, a6, a7, a8, | |
656 a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20); | |
657 # endif | |
658 #else | |
659 # ifdef HAS_snprintf_void | |
660 snprintf(buf, sizeof(buf), format, a1, a2, a3, a4, a5, a6, a7, a8, | |
661 a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20); | |
662 len = strlen(buf); | |
663 # else | |
664 len = snprintf(buf, sizeof(buf), format, a1, a2, a3, a4, a5, a6, a7, a8, | |
665 a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20); | |
666 # endif | |
667 #endif | |
668 if (len <= 0 || len >= sizeof(buf) || buf[sizeof(buf) - 1] != 0) | |
669 return 0; | |
670 return gzwrite(file, buf, len); | |
671 } | |
672 #endif | |
673 | |
674 /* =========================================================================== | |
675 Writes c, converted to an unsigned char, into the compressed file. | |
676 gzputc returns the value that was written, or -1 in case of error. | |
677 */ | |
678 int ZEXPORT gzputc(file, c) | |
679 gzFile file; | |
680 int c; | |
681 { | |
682 unsigned char cc = (unsigned char) c; /* required for big endian systems */ | |
683 | |
684 return gzwrite(file, &cc, 1) == 1 ? (int)cc : -1; | |
685 } | |
686 | |
687 | |
688 /* =========================================================================== | |
689 Writes the given null-terminated string to the compressed file, excluding | |
690 the terminating null character. | |
691 gzputs returns the number of characters written, or -1 in case of error. | |
692 */ | |
693 int ZEXPORT gzputs(file, s) | |
694 gzFile file; | |
695 const char *s; | |
696 { | |
697 return gzwrite(file, (char*)s, (unsigned)strlen(s)); | |
698 } | |
699 | |
700 | |
701 /* =========================================================================== | |
702 Flushes all pending output into the compressed file. The parameter | |
703 flush is as in the deflate() function. | |
704 */ | |
705 local int do_flush (file, flush) | |
706 gzFile file; | |
707 int flush; | |
708 { | |
709 uInt len; | |
710 int done = 0; | |
711 gz_stream *s = (gz_stream*)file; | |
712 | |
713 if (s == NULL || s->mode != 'w') return Z_STREAM_ERROR; | |
714 | |
715 s->stream.avail_in = 0; /* should be zero already anyway */ | |
716 | |
717 for (;;) { | |
718 len = Z_BUFSIZE - s->stream.avail_out; | |
719 | |
720 if (len != 0) { | |
721 if ((uInt)fwrite(s->outbuf, 1, len, s->file) != len) { | |
722 s->z_err = Z_ERRNO; | |
723 return Z_ERRNO; | |
724 } | |
725 s->stream.next_out = s->outbuf; | |
726 s->stream.avail_out = Z_BUFSIZE; | |
727 } | |
728 if (done) break; | |
729 s->out += s->stream.avail_out; | |
730 s->z_err = deflate(&(s->stream), flush); | |
731 s->out -= s->stream.avail_out; | |
732 | |
733 /* Ignore the second of two consecutive flushes: */ | |
734 if (len == 0 && s->z_err == Z_BUF_ERROR) s->z_err = Z_OK; | |
735 | |
736 /* deflate has finished flushing only when it hasn't used up | |
737 * all the available space in the output buffer: | |
738 */ | |
739 done = (s->stream.avail_out != 0 || s->z_err == Z_STREAM_END); | |
740 | |
741 if (s->z_err != Z_OK && s->z_err != Z_STREAM_END) break; | |
742 } | |
743 return s->z_err == Z_STREAM_END ? Z_OK : s->z_err; | |
744 } | |
745 | |
746 int ZEXPORT gzflush (file, flush) | |
747 gzFile file; | |
748 int flush; | |
749 { | |
750 gz_stream *s = (gz_stream*)file; | |
751 int err = do_flush (file, flush); | |
752 | |
753 if (err) return err; | |
754 fflush(s->file); | |
755 return s->z_err == Z_STREAM_END ? Z_OK : s->z_err; | |
756 } | |
757 #endif /* NO_GZCOMPRESS */ | |
758 | |
759 /* =========================================================================== | |
760 Sets the starting position for the next gzread or gzwrite on the given | |
761 compressed file. The offset represents a number of bytes in the | |
762 gzseek returns the resulting offset location as measured in bytes from | |
763 the beginning of the uncompressed stream, or -1 in case of error. | |
764 SEEK_END is not implemented, returns error. | |
765 In this version of the library, gzseek can be extremely slow. | |
766 */ | |
767 z_off_t ZEXPORT gzseek (file, offset, whence) | |
768 gzFile file; | |
769 z_off_t offset; | |
770 int whence; | |
771 { | |
772 gz_stream *s = (gz_stream*)file; | |
773 | |
774 if (s == NULL || whence == SEEK_END || | |
775 s->z_err == Z_ERRNO || s->z_err == Z_DATA_ERROR) { | |
776 return -1L; | |
777 } | |
778 | |
779 if (s->mode == 'w') { | |
780 #ifdef NO_GZCOMPRESS | |
781 return -1L; | |
782 #else | |
783 if (whence == SEEK_SET) { | |
784 offset -= s->in; | |
785 } | |
786 if (offset < 0) return -1L; | |
787 | |
788 /* At this point, offset is the number of zero bytes to write. */ | |
789 if (s->inbuf == Z_NULL) { | |
790 s->inbuf = (Byte*)ALLOC(Z_BUFSIZE); /* for seeking */ | |
791 if (s->inbuf == Z_NULL) return -1L; | |
792 zmemzero(s->inbuf, Z_BUFSIZE); | |
793 } | |
794 while (offset > 0) { | |
795 uInt size = Z_BUFSIZE; | |
796 if (offset < Z_BUFSIZE) size = (uInt)offset; | |
797 | |
798 size = gzwrite(file, s->inbuf, size); | |
799 if (size == 0) return -1L; | |
800 | |
801 offset -= size; | |
802 } | |
803 return s->in; | |
804 #endif | |
805 } | |
806 /* Rest of function is for reading only */ | |
807 | |
808 /* compute absolute position */ | |
809 if (whence == SEEK_CUR) { | |
810 offset += s->out; | |
811 } | |
812 if (offset < 0) return -1L; | |
813 | |
814 if (s->transparent) { | |
815 /* map to fseek */ | |
816 s->back = EOF; | |
817 s->stream.avail_in = 0; | |
818 s->stream.next_in = s->inbuf; | |
819 if (fseek(s->file, offset, SEEK_SET) < 0) return -1L; | |
820 | |
821 s->in = s->out = offset; | |
822 return offset; | |
823 } | |
824 | |
825 /* For a negative seek, rewind and use positive seek */ | |
826 if (offset >= s->out) { | |
827 offset -= s->out; | |
828 } else if (gzrewind(file) < 0) { | |
829 return -1L; | |
830 } | |
831 /* offset is now the number of bytes to skip. */ | |
832 | |
833 if (offset != 0 && s->outbuf == Z_NULL) { | |
834 s->outbuf = (Byte*)ALLOC(Z_BUFSIZE); | |
835 if (s->outbuf == Z_NULL) return -1L; | |
836 } | |
837 if (offset && s->back != EOF) { | |
838 s->back = EOF; | |
839 s->out++; | |
840 offset--; | |
841 if (s->last) s->z_err = Z_STREAM_END; | |
842 } | |
843 while (offset > 0) { | |
844 int size = Z_BUFSIZE; | |
845 if (offset < Z_BUFSIZE) size = (int)offset; | |
846 | |
847 size = gzread(file, s->outbuf, (uInt)size); | |
848 if (size <= 0) return -1L; | |
849 offset -= size; | |
850 } | |
851 return s->out; | |
852 } | |
853 | |
854 /* =========================================================================== | |
855 Rewinds input file. | |
856 */ | |
857 int ZEXPORT gzrewind (file) | |
858 gzFile file; | |
859 { | |
860 gz_stream *s = (gz_stream*)file; | |
861 | |
862 if (s == NULL || s->mode != 'r') return -1; | |
863 | |
864 s->z_err = Z_OK; | |
865 s->z_eof = 0; | |
866 s->back = EOF; | |
867 s->stream.avail_in = 0; | |
868 s->stream.next_in = s->inbuf; | |
869 s->crc = crc32(0L, Z_NULL, 0); | |
870 if (!s->transparent) (void)inflateReset(&s->stream); | |
871 s->in = 0; | |
872 s->out = 0; | |
873 return fseek(s->file, s->start, SEEK_SET); | |
874 } | |
875 | |
876 /* =========================================================================== | |
877 Returns the starting position for the next gzread or gzwrite on the | |
878 given compressed file. This position represents a number of bytes in the | |
879 uncompressed data stream. | |
880 */ | |
881 z_off_t ZEXPORT gztell (file) | |
882 gzFile file; | |
883 { | |
884 return gzseek(file, 0L, SEEK_CUR); | |
885 } | |
886 | |
887 /* =========================================================================== | |
888 Returns 1 when EOF has previously been detected reading the given | |
889 input stream, otherwise zero. | |
890 */ | |
891 int ZEXPORT gzeof (file) | |
892 gzFile file; | |
893 { | |
894 gz_stream *s = (gz_stream*)file; | |
895 | |
896 /* With concatenated compressed files that can have embedded | |
897 * crc trailers, z_eof is no longer the only/best indicator of EOF | |
898 * on a gz_stream. Handle end-of-stream error explicitly here. | |
899 */ | |
900 if (s == NULL || s->mode != 'r') return 0; | |
901 if (s->z_eof) return 1; | |
902 return s->z_err == Z_STREAM_END; | |
903 } | |
904 | |
905 /* =========================================================================== | |
906 Returns 1 if reading and doing so transparently, otherwise zero. | |
907 */ | |
908 int ZEXPORT gzdirect (file) | |
909 gzFile file; | |
910 { | |
911 gz_stream *s = (gz_stream*)file; | |
912 | |
913 if (s == NULL || s->mode != 'r') return 0; | |
914 return s->transparent; | |
915 } | |
916 | |
917 /* =========================================================================== | |
918 Outputs a long in LSB order to the given file | |
919 */ | |
920 local void putLong (file, x) | |
921 FILE *file; | |
922 uLong x; | |
923 { | |
924 int n; | |
925 for (n = 0; n < 4; n++) { | |
926 fputc((int)(x & 0xff), file); | |
927 x >>= 8; | |
928 } | |
929 } | |
930 | |
931 /* =========================================================================== | |
932 Reads a long in LSB order from the given gz_stream. Sets z_err in case | |
933 of error. | |
934 */ | |
935 local uLong getLong (s) | |
936 gz_stream *s; | |
937 { | |
938 uLong x = (uLong)get_byte(s); | |
939 int c; | |
940 | |
941 x += ((uLong)get_byte(s))<<8; | |
942 x += ((uLong)get_byte(s))<<16; | |
943 c = get_byte(s); | |
944 if (c == EOF) s->z_err = Z_DATA_ERROR; | |
945 x += ((uLong)c)<<24; | |
946 return x; | |
947 } | |
948 | |
949 /* =========================================================================== | |
950 Flushes all pending output if necessary, closes the compressed file | |
951 and deallocates all the (de)compression state. | |
952 */ | |
953 int ZEXPORT gzclose (file) | |
954 gzFile file; | |
955 { | |
956 gz_stream *s = (gz_stream*)file; | |
957 | |
958 if (s == NULL) return Z_STREAM_ERROR; | |
959 | |
960 if (s->mode == 'w') { | |
961 #ifdef NO_GZCOMPRESS | |
962 return Z_STREAM_ERROR; | |
963 #else | |
964 if (do_flush (file, Z_FINISH) != Z_OK) | |
965 return destroy((gz_stream*)file); | |
966 | |
967 putLong (s->file, s->crc); | |
968 putLong (s->file, (uLong)(s->in & 0xffffffff)); | |
969 #endif | |
970 } | |
971 return destroy((gz_stream*)file); | |
972 } | |
973 | |
974 #ifdef STDC | |
975 # define zstrerror(errnum) strerror(errnum) | |
976 #else | |
977 # define zstrerror(errnum) "" | |
978 #endif | |
979 | |
980 /* =========================================================================== | |
981 Returns the error message for the last error which occurred on the | |
982 given compressed file. errnum is set to zlib error number. If an | |
983 error occurred in the file system and not in the compression library, | |
984 errnum is set to Z_ERRNO and the application may consult errno | |
985 to get the exact error code. | |
986 */ | |
987 const char * ZEXPORT gzerror (file, errnum) | |
988 gzFile file; | |
989 int *errnum; | |
990 { | |
991 char *m; | |
992 gz_stream *s = (gz_stream*)file; | |
993 | |
994 if (s == NULL) { | |
995 *errnum = Z_STREAM_ERROR; | |
996 return (const char*)ERR_MSG(Z_STREAM_ERROR); | |
997 } | |
998 *errnum = s->z_err; | |
999 if (*errnum == Z_OK) return (const char*)""; | |
1000 | |
1001 m = (char*)(*errnum == Z_ERRNO ? zstrerror(errno) : s->stream.msg); | |
1002 | |
1003 if (m == NULL || *m == '\0') m = (char*)ERR_MSG(s->z_err); | |
1004 | |
1005 TRYFREE(s->msg); | |
1006 s->msg = (char*)ALLOC(strlen(s->path) + strlen(m) + 3); | |
1007 if (s->msg == Z_NULL) return (const char*)ERR_MSG(Z_MEM_ERROR); | |
1008 strcpy(s->msg, s->path); | |
1009 strcat(s->msg, ": "); | |
1010 strcat(s->msg, m); | |
1011 return (const char*)s->msg; | |
1012 } | |
1013 | |
1014 /* =========================================================================== | |
1015 Clear the error and end-of-file flags, and do the same for the real file. | |
1016 */ | |
1017 void ZEXPORT gzclearerr (file) | |
1018 gzFile file; | |
1019 { | |
1020 gz_stream *s = (gz_stream*)file; | |
1021 | |
1022 if (s == NULL) return; | |
1023 if (s->z_err != Z_STREAM_END) s->z_err = Z_OK; | |
1024 s->z_eof = 0; | |
1025 clearerr(s->file); | |
1026 } |