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43743d63 MK |
1 | /* gzread.c -- zlib functions for reading gzip files |
2 | * Copyright (C) 2004, 2005, 2010 Mark Adler | |
3 | * For conditions of distribution and use, see copyright notice in zlib.h | |
4 | */ | |
5 | ||
6 | #include "gzguts.h" | |
7 | ||
8 | /* Local functions */ | |
9 | local int gz_load OF((gz_statep, unsigned char *, unsigned, unsigned *)); | |
10 | local int gz_avail OF((gz_statep)); | |
11 | local int gz_next4 OF((gz_statep, unsigned long *)); | |
12 | local int gz_head OF((gz_statep)); | |
13 | local int gz_decomp OF((gz_statep)); | |
14 | local int gz_make OF((gz_statep)); | |
15 | local int gz_skip OF((gz_statep, z_off64_t)); | |
16 | ||
17 | /* Use read() to load a buffer -- return -1 on error, otherwise 0. Read from | |
18 | state->fd, and update state->eof, state->err, and state->msg as appropriate. | |
19 | This function needs to loop on read(), since read() is not guaranteed to | |
20 | read the number of bytes requested, depending on the type of descriptor. */ | |
21 | local int gz_load(state, buf, len, have) | |
22 | gz_statep state; | |
23 | unsigned char *buf; | |
24 | unsigned len; | |
25 | unsigned *have; | |
26 | { | |
27 | int ret; | |
28 | ||
29 | *have = 0; | |
30 | do { | |
31 | ret = read(state->fd, buf + *have, len - *have); | |
32 | if (ret <= 0) | |
33 | break; | |
34 | *have += ret; | |
35 | } while (*have < len); | |
36 | if (ret < 0) { | |
37 | gz_error(state, Z_ERRNO, zstrerror()); | |
38 | return -1; | |
39 | } | |
40 | if (ret == 0) | |
41 | state->eof = 1; | |
42 | return 0; | |
43 | } | |
44 | ||
45 | /* Load up input buffer and set eof flag if last data loaded -- return -1 on | |
46 | error, 0 otherwise. Note that the eof flag is set when the end of the input | |
47 | file is reached, even though there may be unused data in the buffer. Once | |
48 | that data has been used, no more attempts will be made to read the file. | |
49 | gz_avail() assumes that strm->avail_in == 0. */ | |
50 | local int gz_avail(state) | |
51 | gz_statep state; | |
52 | { | |
53 | z_streamp strm = &(state->strm); | |
54 | ||
55 | if (state->err != Z_OK) | |
56 | return -1; | |
57 | if (state->eof == 0) { | |
58 | if (gz_load(state, state->in, state->size, | |
59 | (unsigned *)&(strm->avail_in)) == -1) | |
60 | return -1; | |
61 | strm->next_in = state->in; | |
62 | } | |
63 | return 0; | |
64 | } | |
65 | ||
66 | /* Get next byte from input, or -1 if end or error. */ | |
67 | #define NEXT() ((strm->avail_in == 0 && gz_avail(state) == -1) ? -1 : \ | |
68 | (strm->avail_in == 0 ? -1 : \ | |
69 | (strm->avail_in--, *(strm->next_in)++))) | |
70 | ||
71 | /* Get a four-byte little-endian integer and return 0 on success and the value | |
72 | in *ret. Otherwise -1 is returned and *ret is not modified. */ | |
73 | local int gz_next4(state, ret) | |
74 | gz_statep state; | |
75 | unsigned long *ret; | |
76 | { | |
77 | int ch; | |
78 | unsigned long val; | |
79 | z_streamp strm = &(state->strm); | |
80 | ||
81 | val = NEXT(); | |
82 | val += (unsigned)NEXT() << 8; | |
83 | val += (unsigned long)NEXT() << 16; | |
84 | ch = NEXT(); | |
85 | if (ch == -1) | |
86 | return -1; | |
87 | val += (unsigned long)ch << 24; | |
88 | *ret = val; | |
89 | return 0; | |
90 | } | |
91 | ||
92 | /* Look for gzip header, set up for inflate or copy. state->have must be zero. | |
93 | If this is the first time in, allocate required memory. state->how will be | |
94 | left unchanged if there is no more input data available, will be set to COPY | |
95 | if there is no gzip header and direct copying will be performed, or it will | |
96 | be set to GZIP for decompression, and the gzip header will be skipped so | |
97 | that the next available input data is the raw deflate stream. If direct | |
98 | copying, then leftover input data from the input buffer will be copied to | |
99 | the output buffer. In that case, all further file reads will be directly to | |
100 | either the output buffer or a user buffer. If decompressing, the inflate | |
101 | state and the check value will be initialized. gz_head() will return 0 on | |
102 | success or -1 on failure. Failures may include read errors or gzip header | |
103 | errors. */ | |
104 | local int gz_head(state) | |
105 | gz_statep state; | |
106 | { | |
107 | z_streamp strm = &(state->strm); | |
108 | int flags; | |
109 | unsigned len; | |
110 | ||
111 | /* allocate read buffers and inflate memory */ | |
112 | if (state->size == 0) { | |
113 | /* allocate buffers */ | |
114 | state->in = malloc(state->want); | |
115 | state->out = malloc(state->want << 1); | |
116 | if (state->in == NULL || state->out == NULL) { | |
117 | if (state->out != NULL) | |
118 | free(state->out); | |
119 | if (state->in != NULL) | |
120 | free(state->in); | |
121 | gz_error(state, Z_MEM_ERROR, "out of memory"); | |
122 | return -1; | |
123 | } | |
124 | state->size = state->want; | |
125 | ||
126 | /* allocate inflate memory */ | |
127 | state->strm.zalloc = Z_NULL; | |
128 | state->strm.zfree = Z_NULL; | |
129 | state->strm.opaque = Z_NULL; | |
130 | state->strm.avail_in = 0; | |
131 | state->strm.next_in = Z_NULL; | |
132 | if (inflateInit2(&(state->strm), -15) != Z_OK) { /* raw inflate */ | |
133 | free(state->out); | |
134 | free(state->in); | |
135 | state->size = 0; | |
136 | gz_error(state, Z_MEM_ERROR, "out of memory"); | |
137 | return -1; | |
138 | } | |
139 | } | |
140 | ||
141 | /* get some data in the input buffer */ | |
142 | if (strm->avail_in == 0) { | |
143 | if (gz_avail(state) == -1) | |
144 | return -1; | |
145 | if (strm->avail_in == 0) | |
146 | return 0; | |
147 | } | |
148 | ||
149 | /* look for the gzip magic header bytes 31 and 139 */ | |
150 | if (strm->next_in[0] == 31) { | |
151 | strm->avail_in--; | |
152 | strm->next_in++; | |
153 | if (strm->avail_in == 0 && gz_avail(state) == -1) | |
154 | return -1; | |
155 | if (strm->avail_in && strm->next_in[0] == 139) { | |
156 | /* we have a gzip header, woo hoo! */ | |
157 | strm->avail_in--; | |
158 | strm->next_in++; | |
159 | ||
160 | /* skip rest of header */ | |
161 | if (NEXT() != 8) { /* compression method */ | |
162 | gz_error(state, Z_DATA_ERROR, "unknown compression method"); | |
163 | return -1; | |
164 | } | |
165 | flags = NEXT(); | |
166 | if (flags & 0xe0) { /* reserved flag bits */ | |
167 | gz_error(state, Z_DATA_ERROR, "unknown header flags set"); | |
168 | return -1; | |
169 | } | |
170 | NEXT(); /* modification time */ | |
171 | NEXT(); | |
172 | NEXT(); | |
173 | NEXT(); | |
174 | NEXT(); /* extra flags */ | |
175 | NEXT(); /* operating system */ | |
176 | if (flags & 4) { /* extra field */ | |
177 | len = (unsigned)NEXT(); | |
178 | len += (unsigned)NEXT() << 8; | |
179 | while (len--) | |
180 | if (NEXT() < 0) | |
181 | break; | |
182 | } | |
183 | if (flags & 8) /* file name */ | |
184 | while (NEXT() > 0) | |
185 | ; | |
186 | if (flags & 16) /* comment */ | |
187 | while (NEXT() > 0) | |
188 | ; | |
189 | if (flags & 2) { /* header crc */ | |
190 | NEXT(); | |
191 | NEXT(); | |
192 | } | |
193 | /* an unexpected end of file is not checked for here -- it will be | |
194 | noticed on the first request for uncompressed data */ | |
195 | ||
196 | /* set up for decompression */ | |
197 | inflateReset(strm); | |
198 | strm->adler = crc32(0L, Z_NULL, 0); | |
199 | state->how = GZIP; | |
200 | state->direct = 0; | |
201 | return 0; | |
202 | } | |
203 | else { | |
204 | /* not a gzip file -- save first byte (31) and fall to raw i/o */ | |
205 | state->out[0] = 31; | |
206 | state->have = 1; | |
207 | } | |
208 | } | |
209 | ||
210 | /* doing raw i/o, save start of raw data for seeking, copy any leftover | |
211 | input to output -- this assumes that the output buffer is larger than | |
212 | the input buffer, which also assures space for gzungetc() */ | |
213 | state->raw = state->pos; | |
214 | state->next = state->out; | |
215 | if (strm->avail_in) { | |
216 | memcpy(state->next + state->have, strm->next_in, strm->avail_in); | |
217 | state->have += strm->avail_in; | |
218 | strm->avail_in = 0; | |
219 | } | |
220 | state->how = COPY; | |
221 | state->direct = 1; | |
222 | return 0; | |
223 | } | |
224 | ||
225 | /* Decompress from input to the provided next_out and avail_out in the state. | |
226 | If the end of the compressed data is reached, then verify the gzip trailer | |
227 | check value and length (modulo 2^32). state->have and state->next are set | |
228 | to point to the just decompressed data, and the crc is updated. If the | |
229 | trailer is verified, state->how is reset to LOOK to look for the next gzip | |
230 | stream or raw data, once state->have is depleted. Returns 0 on success, -1 | |
231 | on failure. Failures may include invalid compressed data or a failed gzip | |
232 | trailer verification. */ | |
233 | local int gz_decomp(state) | |
234 | gz_statep state; | |
235 | { | |
236 | int ret; | |
237 | unsigned had; | |
238 | unsigned long crc, len; | |
239 | z_streamp strm = &(state->strm); | |
240 | ||
241 | /* fill output buffer up to end of deflate stream */ | |
242 | had = strm->avail_out; | |
243 | do { | |
244 | /* get more input for inflate() */ | |
245 | if (strm->avail_in == 0 && gz_avail(state) == -1) | |
246 | return -1; | |
247 | if (strm->avail_in == 0) { | |
248 | gz_error(state, Z_DATA_ERROR, "unexpected end of file"); | |
249 | return -1; | |
250 | } | |
251 | ||
252 | /* decompress and handle errors */ | |
253 | ret = inflate(strm, Z_NO_FLUSH); | |
254 | if (ret == Z_STREAM_ERROR || ret == Z_NEED_DICT) { | |
255 | gz_error(state, Z_STREAM_ERROR, | |
256 | "internal error: inflate stream corrupt"); | |
257 | return -1; | |
258 | } | |
259 | if (ret == Z_MEM_ERROR) { | |
260 | gz_error(state, Z_MEM_ERROR, "out of memory"); | |
261 | return -1; | |
262 | } | |
263 | if (ret == Z_DATA_ERROR) { /* deflate stream invalid */ | |
264 | gz_error(state, Z_DATA_ERROR, | |
265 | strm->msg == NULL ? "compressed data error" : strm->msg); | |
266 | return -1; | |
267 | } | |
268 | } while (strm->avail_out && ret != Z_STREAM_END); | |
269 | ||
270 | /* update available output and crc check value */ | |
271 | state->have = had - strm->avail_out; | |
272 | state->next = strm->next_out - state->have; | |
273 | strm->adler = crc32(strm->adler, state->next, state->have); | |
274 | ||
275 | /* check gzip trailer if at end of deflate stream */ | |
276 | if (ret == Z_STREAM_END) { | |
277 | if (gz_next4(state, &crc) == -1 || gz_next4(state, &len) == -1) { | |
278 | gz_error(state, Z_DATA_ERROR, "unexpected end of file"); | |
279 | return -1; | |
280 | } | |
281 | if (crc != strm->adler) { | |
282 | gz_error(state, Z_DATA_ERROR, "incorrect data check"); | |
283 | return -1; | |
284 | } | |
285 | if (len != (strm->total_out & 0xffffffffL)) { | |
286 | gz_error(state, Z_DATA_ERROR, "incorrect length check"); | |
287 | return -1; | |
288 | } | |
289 | state->how = LOOK; /* ready for next stream, once have is 0 (leave | |
290 | state->direct unchanged to remember how) */ | |
291 | } | |
292 | ||
293 | /* good decompression */ | |
294 | return 0; | |
295 | } | |
296 | ||
297 | /* Make data and put in the output buffer. Assumes that state->have == 0. | |
298 | Data is either copied from the input file or decompressed from the input | |
299 | file depending on state->how. If state->how is LOOK, then a gzip header is | |
300 | looked for (and skipped if found) to determine wither to copy or decompress. | |
301 | Returns -1 on error, otherwise 0. gz_make() will leave state->have as COPY | |
302 | or GZIP unless the end of the input file has been reached and all data has | |
303 | been processed. */ | |
304 | local int gz_make(state) | |
305 | gz_statep state; | |
306 | { | |
307 | z_streamp strm = &(state->strm); | |
308 | ||
309 | if (state->how == LOOK) { /* look for gzip header */ | |
310 | if (gz_head(state) == -1) | |
311 | return -1; | |
312 | if (state->have) /* got some data from gz_head() */ | |
313 | return 0; | |
314 | } | |
315 | if (state->how == COPY) { /* straight copy */ | |
316 | if (gz_load(state, state->out, state->size << 1, &(state->have)) == -1) | |
317 | return -1; | |
318 | state->next = state->out; | |
319 | } | |
320 | else if (state->how == GZIP) { /* decompress */ | |
321 | strm->avail_out = state->size << 1; | |
322 | strm->next_out = state->out; | |
323 | if (gz_decomp(state) == -1) | |
324 | return -1; | |
325 | } | |
326 | return 0; | |
327 | } | |
328 | ||
329 | /* Skip len uncompressed bytes of output. Return -1 on error, 0 on success. */ | |
330 | local int gz_skip(state, len) | |
331 | gz_statep state; | |
332 | z_off64_t len; | |
333 | { | |
334 | unsigned n; | |
335 | ||
336 | /* skip over len bytes or reach end-of-file, whichever comes first */ | |
337 | while (len) | |
338 | /* skip over whatever is in output buffer */ | |
339 | if (state->have) { | |
340 | n = GT_OFF(state->have) || (z_off64_t)state->have > len ? | |
341 | (unsigned)len : state->have; | |
342 | state->have -= n; | |
343 | state->next += n; | |
344 | state->pos += n; | |
345 | len -= n; | |
346 | } | |
347 | ||
348 | /* output buffer empty -- return if we're at the end of the input */ | |
349 | else if (state->eof && state->strm.avail_in == 0) | |
350 | break; | |
351 | ||
352 | /* need more data to skip -- load up output buffer */ | |
353 | else { | |
354 | /* get more output, looking for header if required */ | |
355 | if (gz_make(state) == -1) | |
356 | return -1; | |
357 | } | |
358 | return 0; | |
359 | } | |
360 | ||
361 | /* -- see zlib.h -- */ | |
362 | int ZEXPORT gzread(file, buf, len) | |
363 | gzFile file; | |
364 | voidp buf; | |
365 | unsigned len; | |
366 | { | |
367 | unsigned got, n; | |
368 | gz_statep state; | |
369 | z_streamp strm; | |
370 | ||
371 | /* get internal structure */ | |
372 | if (file == NULL) | |
373 | return -1; | |
374 | state = (gz_statep)file; | |
375 | strm = &(state->strm); | |
376 | ||
377 | /* check that we're reading and that there's no error */ | |
378 | if (state->mode != GZ_READ || state->err != Z_OK) | |
379 | return -1; | |
380 | ||
381 | /* since an int is returned, make sure len fits in one, otherwise return | |
382 | with an error (this avoids the flaw in the interface) */ | |
383 | if ((int)len < 0) { | |
384 | gz_error(state, Z_BUF_ERROR, "requested length does not fit in int"); | |
385 | return -1; | |
386 | } | |
387 | ||
388 | /* if len is zero, avoid unnecessary operations */ | |
389 | if (len == 0) | |
390 | return 0; | |
391 | ||
392 | /* process a skip request */ | |
393 | if (state->seek) { | |
394 | state->seek = 0; | |
395 | if (gz_skip(state, state->skip) == -1) | |
396 | return -1; | |
397 | } | |
398 | ||
399 | /* get len bytes to buf, or less than len if at the end */ | |
400 | got = 0; | |
401 | do { | |
402 | /* first just try copying data from the output buffer */ | |
403 | if (state->have) { | |
404 | n = state->have > len ? len : state->have; | |
405 | memcpy(buf, state->next, n); | |
406 | state->next += n; | |
407 | state->have -= n; | |
408 | } | |
409 | ||
410 | /* output buffer empty -- return if we're at the end of the input */ | |
411 | else if (state->eof && strm->avail_in == 0) | |
412 | break; | |
413 | ||
414 | /* need output data -- for small len or new stream load up our output | |
415 | buffer */ | |
416 | else if (state->how == LOOK || len < (state->size << 1)) { | |
417 | /* get more output, looking for header if required */ | |
418 | if (gz_make(state) == -1) | |
419 | return -1; | |
420 | continue; /* no progress yet -- go back to memcpy() above */ | |
421 | /* the copy above assures that we will leave with space in the | |
422 | output buffer, allowing at least one gzungetc() to succeed */ | |
423 | } | |
424 | ||
425 | /* large len -- read directly into user buffer */ | |
426 | else if (state->how == COPY) { /* read directly */ | |
427 | if (gz_load(state, buf, len, &n) == -1) | |
428 | return -1; | |
429 | } | |
430 | ||
431 | /* large len -- decompress directly into user buffer */ | |
432 | else { /* state->how == GZIP */ | |
433 | strm->avail_out = len; | |
434 | strm->next_out = buf; | |
435 | if (gz_decomp(state) == -1) | |
436 | return -1; | |
437 | n = state->have; | |
438 | state->have = 0; | |
439 | } | |
440 | ||
441 | /* update progress */ | |
442 | len -= n; | |
443 | buf = (char *)buf + n; | |
444 | got += n; | |
445 | state->pos += n; | |
446 | } while (len); | |
447 | ||
448 | /* return number of bytes read into user buffer (will fit in int) */ | |
449 | return (int)got; | |
450 | } | |
451 | ||
452 | /* -- see zlib.h -- */ | |
453 | int ZEXPORT gzgetc(file) | |
454 | gzFile file; | |
455 | { | |
456 | int ret; | |
457 | unsigned char buf[1]; | |
458 | gz_statep state; | |
459 | ||
460 | /* get internal structure */ | |
461 | if (file == NULL) | |
462 | return -1; | |
463 | state = (gz_statep)file; | |
464 | ||
465 | /* check that we're reading and that there's no error */ | |
466 | if (state->mode != GZ_READ || state->err != Z_OK) | |
467 | return -1; | |
468 | ||
469 | /* try output buffer (no need to check for skip request) */ | |
470 | if (state->have) { | |
471 | state->have--; | |
472 | state->pos++; | |
473 | return *(state->next)++; | |
474 | } | |
475 | ||
476 | /* nothing there -- try gzread() */ | |
477 | ret = gzread(file, buf, 1); | |
478 | return ret < 1 ? -1 : buf[0]; | |
479 | } | |
480 | ||
481 | /* -- see zlib.h -- */ | |
482 | int ZEXPORT gzungetc(c, file) | |
483 | int c; | |
484 | gzFile file; | |
485 | { | |
486 | gz_statep state; | |
487 | ||
488 | /* get internal structure */ | |
489 | if (file == NULL) | |
490 | return -1; | |
491 | state = (gz_statep)file; | |
492 | ||
493 | /* check that we're reading and that there's no error */ | |
494 | if (state->mode != GZ_READ || state->err != Z_OK) | |
495 | return -1; | |
496 | ||
497 | /* process a skip request */ | |
498 | if (state->seek) { | |
499 | state->seek = 0; | |
500 | if (gz_skip(state, state->skip) == -1) | |
501 | return -1; | |
502 | } | |
503 | ||
504 | /* can't push EOF */ | |
505 | if (c < 0) | |
506 | return -1; | |
507 | ||
508 | /* if output buffer empty, put byte at end (allows more pushing) */ | |
509 | if (state->have == 0) { | |
510 | state->have = 1; | |
511 | state->next = state->out + (state->size << 1) - 1; | |
512 | state->next[0] = c; | |
513 | state->pos--; | |
514 | return c; | |
515 | } | |
516 | ||
517 | /* if no room, give up (must have already done a gzungetc()) */ | |
518 | if (state->have == (state->size << 1)) { | |
519 | gz_error(state, Z_BUF_ERROR, "out of room to push characters"); | |
520 | return -1; | |
521 | } | |
522 | ||
523 | /* slide output data if needed and insert byte before existing data */ | |
524 | if (state->next == state->out) { | |
525 | unsigned char *src = state->out + state->have; | |
526 | unsigned char *dest = state->out + (state->size << 1); | |
527 | while (src > state->out) | |
528 | *--dest = *--src; | |
529 | state->next = dest; | |
530 | } | |
531 | state->have++; | |
532 | state->next--; | |
533 | state->next[0] = c; | |
534 | state->pos--; | |
535 | return c; | |
536 | } | |
537 | ||
538 | /* -- see zlib.h -- */ | |
539 | char * ZEXPORT gzgets(file, buf, len) | |
540 | gzFile file; | |
541 | char *buf; | |
542 | int len; | |
543 | { | |
544 | unsigned left, n; | |
545 | char *str; | |
546 | unsigned char *eol; | |
547 | gz_statep state; | |
548 | ||
549 | /* check parameters and get internal structure */ | |
550 | if (file == NULL || buf == NULL || len < 1) | |
551 | return NULL; | |
552 | state = (gz_statep)file; | |
553 | ||
554 | /* check that we're reading and that there's no error */ | |
555 | if (state->mode != GZ_READ || state->err != Z_OK) | |
556 | return NULL; | |
557 | ||
558 | /* process a skip request */ | |
559 | if (state->seek) { | |
560 | state->seek = 0; | |
561 | if (gz_skip(state, state->skip) == -1) | |
562 | return NULL; | |
563 | } | |
564 | ||
565 | /* copy output bytes up to new line or len - 1, whichever comes first -- | |
566 | append a terminating zero to the string (we don't check for a zero in | |
567 | the contents, let the user worry about that) */ | |
568 | str = buf; | |
569 | left = (unsigned)len - 1; | |
570 | if (left) do { | |
571 | /* assure that something is in the output buffer */ | |
572 | if (state->have == 0) { | |
573 | if (gz_make(state) == -1) | |
574 | return NULL; /* error */ | |
575 | if (state->have == 0) { /* end of file */ | |
576 | if (buf == str) /* got bupkus */ | |
577 | return NULL; | |
578 | break; /* got something -- return it */ | |
579 | } | |
580 | } | |
581 | ||
582 | /* look for end-of-line in current output buffer */ | |
583 | n = state->have > left ? left : state->have; | |
584 | eol = memchr(state->next, '\n', n); | |
585 | if (eol != NULL) | |
586 | n = (unsigned)(eol - state->next) + 1; | |
587 | ||
588 | /* copy through end-of-line, or remainder if not found */ | |
589 | memcpy(buf, state->next, n); | |
590 | state->have -= n; | |
591 | state->next += n; | |
592 | state->pos += n; | |
593 | left -= n; | |
594 | buf += n; | |
595 | } while (left && eol == NULL); | |
596 | ||
597 | /* found end-of-line or out of space -- terminate string and return it */ | |
598 | buf[0] = 0; | |
599 | return str; | |
600 | } | |
601 | ||
602 | /* -- see zlib.h -- */ | |
603 | int ZEXPORT gzdirect(file) | |
604 | gzFile file; | |
605 | { | |
606 | gz_statep state; | |
607 | ||
608 | /* get internal structure */ | |
609 | if (file == NULL) | |
610 | return 0; | |
611 | state = (gz_statep)file; | |
612 | ||
613 | /* check that we're reading */ | |
614 | if (state->mode != GZ_READ) | |
615 | return 0; | |
616 | ||
617 | /* if the state is not known, but we can find out, then do so (this is | |
618 | mainly for right after a gzopen() or gzdopen()) */ | |
619 | if (state->how == LOOK && state->have == 0) | |
620 | (void)gz_head(state); | |
621 | ||
622 | /* return 1 if reading direct, 0 if decompressing a gzip stream */ | |
623 | return state->direct; | |
624 | } | |
625 | ||
626 | /* -- see zlib.h -- */ | |
627 | int ZEXPORT gzclose_r(file) | |
628 | gzFile file; | |
629 | { | |
630 | int ret; | |
631 | gz_statep state; | |
632 | ||
633 | /* get internal structure */ | |
634 | if (file == NULL) | |
635 | return Z_STREAM_ERROR; | |
636 | state = (gz_statep)file; | |
637 | ||
638 | /* check that we're reading */ | |
639 | if (state->mode != GZ_READ) | |
640 | return Z_STREAM_ERROR; | |
641 | ||
642 | /* free memory and close file */ | |
643 | if (state->size) { | |
644 | inflateEnd(&(state->strm)); | |
645 | free(state->out); | |
646 | free(state->in); | |
647 | } | |
648 | gz_error(state, Z_OK, NULL); | |
649 | free(state->path); | |
650 | ret = close(state->fd); | |
651 | free(state); | |
652 | return ret ? Z_ERRNO : Z_OK; | |
653 | } |