diff options
author | Mark Adler <madler@alumni.caltech.edu> | 2011-09-09 23:26:49 -0700 |
---|---|---|
committer | Mark Adler <madler@alumni.caltech.edu> | 2011-09-09 23:26:49 -0700 |
commit | d004b047838a7e803818b4973a2e39e0ff8c1fa2 (patch) | |
tree | 9e8c804f78d73152c70d4ff24c6a7531a0d46782 /gzread.c | |
parent | f6194ef39af5864f792412460c354cc339dde7d1 (diff) | |
download | zlib-d004b047838a7e803818b4973a2e39e0ff8c1fa2.tar.gz zlib-d004b047838a7e803818b4973a2e39e0ff8c1fa2.tar.bz2 zlib-d004b047838a7e803818b4973a2e39e0ff8c1fa2.zip |
zlib 1.2.3.5v1.2.3.5
Diffstat (limited to 'gzread.c')
-rw-r--r-- | gzread.c | 632 |
1 files changed, 632 insertions, 0 deletions
diff --git a/gzread.c b/gzread.c new file mode 100644 index 0000000..836c57c --- /dev/null +++ b/gzread.c | |||
@@ -0,0 +1,632 @@ | |||
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 | #ifndef OLD_GZIO | ||
7 | |||
8 | #include "gzguts.h" | ||
9 | |||
10 | /* Local functions */ | ||
11 | local int gz_load OF((gz_statep, unsigned char *, unsigned, unsigned *)); | ||
12 | local int gz_avail OF((gz_statep)); | ||
13 | local int gz_next4 OF((gz_statep, unsigned long *)); | ||
14 | local int gz_head OF((gz_statep)); | ||
15 | local int gz_decomp OF((gz_statep)); | ||
16 | local int gz_make OF((gz_statep)); | ||
17 | local int gz_skip OF((gz_statep, z_off_t)); | ||
18 | |||
19 | /* Use read() to load a buffer -- return -1 on error, otherwise 0. Read from | ||
20 | state->fd, and update state->eof, state->err, and state->msg as appropriate. | ||
21 | This function needs to loop on read(), since read() is not guaranteed to | ||
22 | read the number of bytes requested, depending on the type of descriptor. */ | ||
23 | local int gz_load(state, buf, len, have) | ||
24 | gz_statep state; | ||
25 | unsigned char *buf; | ||
26 | unsigned len; | ||
27 | unsigned *have; | ||
28 | { | ||
29 | int ret; | ||
30 | |||
31 | *have = 0; | ||
32 | do { | ||
33 | ret = read(state->fd, buf + *have, len - *have); | ||
34 | if (ret <= 0) | ||
35 | break; | ||
36 | *have += ret; | ||
37 | } while (*have < len); | ||
38 | if (ret < 0) { | ||
39 | gz_error(state, Z_ERRNO, zstrerror()); | ||
40 | return -1; | ||
41 | } | ||
42 | if (ret == 0) | ||
43 | state->eof = 1; | ||
44 | return 0; | ||
45 | } | ||
46 | |||
47 | /* Load up input buffer and set eof flag if last data loaded -- return -1 on | ||
48 | error, 0 otherwise. Note that the eof flag is set when the end of the input | ||
49 | file is reached, even though there may be unused data in the buffer. Once | ||
50 | that data has been used, no more attempts will be made to read the file. | ||
51 | gz_avail() assumes that strm->avail_in == 0. */ | ||
52 | local int gz_avail(state) | ||
53 | gz_statep state; | ||
54 | { | ||
55 | z_streamp strm = &(state->strm); | ||
56 | |||
57 | if (state->err != Z_OK) | ||
58 | return -1; | ||
59 | if (state->eof == 0) { | ||
60 | if (gz_load(state, state->in, state->size, &(strm->avail_in)) == -1) | ||
61 | return -1; | ||
62 | strm->next_in = state->in; | ||
63 | } | ||
64 | return 0; | ||
65 | } | ||
66 | |||
67 | /* Get next byte from input, or -1 if end or error. */ | ||
68 | #define NEXT() ((strm->avail_in == 0 && gz_avail(state) == -1) ? -1 : \ | ||
69 | (strm->avail_in == 0 ? -1 : \ | ||
70 | (strm->avail_in--, *(strm->next_in)++))) | ||
71 | |||
72 | /* Get a four-byte little-endian integer and return 0 on success and the | ||
73 | value in *ret. Otherwise -1 is returned and *ret is not modified. */ | ||
74 | local int gz_next4(state, ret) | ||
75 | gz_statep state; | ||
76 | unsigned long *ret; | ||
77 | { | ||
78 | int ch; | ||
79 | unsigned long val; | ||
80 | z_streamp strm = &(state->strm); | ||
81 | |||
82 | val = NEXT(); | ||
83 | val += (unsigned)NEXT() << 8; | ||
84 | val += (unsigned long)NEXT() << 16; | ||
85 | ch = NEXT(); | ||
86 | if (ch == -1) | ||
87 | return -1; | ||
88 | val += (unsigned long)ch << 24; | ||
89 | *ret = val; | ||
90 | return 0; | ||
91 | } | ||
92 | |||
93 | /* Look for gzip header, set up for inflate or copy. state->have must be zero. | ||
94 | If this is the first time in, allocate required memory. state->how will be | ||
95 | left unchanged if there is no more input data available, will be set to 1 if | ||
96 | there is no gzip header and direct copying will be performned, or it will be | ||
97 | set to 2 for decompression, and the gzip header will be skipped so that the | ||
98 | next available input data is the raw deflate stream. If direct copying, | ||
99 | then leftover input data from the input buffer will be copied to the output | ||
100 | buffer. In that case, all further file reads will be directly to either the | ||
101 | output buffer or a user buffer. If decompressing, the inflate state and the | ||
102 | check value will be initialized. gz_head() will return 0 on success or -1 | ||
103 | on failure. Failures may include read errors or gzip header 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 | |||
194 | /* set up for decompression */ | ||
195 | inflateReset(strm); | ||
196 | strm->adler = crc32(0L, Z_NULL, 0); | ||
197 | state->how = 2; | ||
198 | return 0; | ||
199 | } | ||
200 | else { | ||
201 | /* not a gzip file -- save first byte (31) and fall to raw i/o */ | ||
202 | state->out[0] = 31; | ||
203 | state->have = 1; | ||
204 | } | ||
205 | } | ||
206 | |||
207 | /* doing raw i/o, save start of raw data for seeking, copy any leftover | ||
208 | input to output -- this assumes that the output buffer is larger than | ||
209 | the input buffer */ | ||
210 | state->raw = state->pos; | ||
211 | state->next = state->out; | ||
212 | if (strm->avail_in) { | ||
213 | memcpy(state->next + state->have, strm->next_in, strm->avail_in); | ||
214 | state->have += strm->avail_in; | ||
215 | strm->avail_in = 0; | ||
216 | } | ||
217 | state->how = 1; | ||
218 | return 0; | ||
219 | } | ||
220 | |||
221 | /* Decompress from input to the provided next_out and avail_out in the state. | ||
222 | If the end of the compressed data is reached, then verify the gzip trailer | ||
223 | check value and length (modulo 2^32). state->have and state->next are | ||
224 | set to point to the just decompressed data, and the crc is updated. If the | ||
225 | trailer is verified, state->how is reset to zero to look for the next gzip | ||
226 | stream or raw data, once state->have is depleted. Returns 0 on success, -1 | ||
227 | on failure. Failures may include invalid compressed data or a failed gzip | ||
228 | trailer verification. */ | ||
229 | local int gz_decomp(state) | ||
230 | gz_statep state; | ||
231 | { | ||
232 | int ret; | ||
233 | unsigned had; | ||
234 | unsigned long crc, len; | ||
235 | z_streamp strm = &(state->strm); | ||
236 | |||
237 | /* fill output buffer up to end of deflate stream */ | ||
238 | had = strm->avail_out; | ||
239 | do { | ||
240 | /* get more input for inflate() */ | ||
241 | if (strm->avail_in == 0 && gz_avail(state) == -1) | ||
242 | return -1; | ||
243 | if (strm->avail_in == 0) { | ||
244 | gz_error(state, Z_DATA_ERROR, "unexpected end of file"); | ||
245 | return -1; | ||
246 | } | ||
247 | |||
248 | /* decompress and handle errors */ | ||
249 | ret = inflate(strm, Z_NO_FLUSH); | ||
250 | if (ret == Z_STREAM_ERROR || ret == Z_NEED_DICT) { | ||
251 | gz_error(state, Z_STREAM_ERROR, | ||
252 | "internal error: inflate stream corrupt"); | ||
253 | return -1; | ||
254 | } | ||
255 | if (ret == Z_MEM_ERROR) { | ||
256 | gz_error(state, Z_MEM_ERROR, "out of memory"); | ||
257 | return -1; | ||
258 | } | ||
259 | if (ret == Z_DATA_ERROR) { /* deflate stream invalid */ | ||
260 | gz_error(state, Z_DATA_ERROR, | ||
261 | strm->msg == NULL ? "compressed data error" : strm->msg); | ||
262 | return -1; | ||
263 | } | ||
264 | } while (strm->avail_out && ret != Z_STREAM_END); | ||
265 | |||
266 | /* update available output and crc check value */ | ||
267 | state->have = had - strm->avail_out; | ||
268 | state->next = strm->next_out - state->have; | ||
269 | strm->adler = crc32(strm->adler, state->next, state->have); | ||
270 | |||
271 | /* check gzip trailer if at end of deflate stream */ | ||
272 | if (ret == Z_STREAM_END) { | ||
273 | if (gz_next4(state, &crc) == -1 || gz_next4(state, &len) == -1) { | ||
274 | gz_error(state, Z_DATA_ERROR, "unexpected end of file"); | ||
275 | return -1; | ||
276 | } | ||
277 | if (crc != strm->adler) { | ||
278 | gz_error(state, Z_DATA_ERROR, "incorrect data check"); | ||
279 | return -1; | ||
280 | } | ||
281 | if (len != (strm->total_out & 0xffffffffL)) { | ||
282 | gz_error(state, Z_DATA_ERROR, "incorrect length check"); | ||
283 | return -1; | ||
284 | } | ||
285 | state->how = 0; /* ready for next stream, once have is 0 */ | ||
286 | } | ||
287 | |||
288 | /* good decompression */ | ||
289 | return 0; | ||
290 | } | ||
291 | |||
292 | /* Make data and put in the output buffer. Assumes that state->have == 0. | ||
293 | Data is either copied from the input file or decompressed from the input | ||
294 | file depending on state->how. If state->how is zero, then a gzip header is | ||
295 | looked for (and skipped if found) to determine wither to copy or decompress. | ||
296 | Returns -1 on error, otherwise 0. gz_make() will leave state->have non-zero | ||
297 | unless the end of the input file has been reached and all data has been | ||
298 | processed. */ | ||
299 | local int gz_make(state) | ||
300 | gz_statep state; | ||
301 | { | ||
302 | z_streamp strm = &(state->strm); | ||
303 | |||
304 | if (state->how == 0) { /* look for gzip header */ | ||
305 | if (gz_head(state) == -1) | ||
306 | return -1; | ||
307 | if (state->have) /* got some data from gz_head() */ | ||
308 | return 0; | ||
309 | } | ||
310 | if (state->how == 1) { /* straight copy */ | ||
311 | if (gz_load(state, state->out, state->size << 1, &(state->have)) == -1) | ||
312 | return -1; | ||
313 | state->next = state->out; | ||
314 | } | ||
315 | else if (state->how == 2) { /* decompress */ | ||
316 | strm->avail_out = state->size << 1; | ||
317 | strm->next_out = state->out; | ||
318 | if (gz_decomp(state) == -1) | ||
319 | return -1; | ||
320 | } | ||
321 | return 0; | ||
322 | } | ||
323 | |||
324 | /* Skip len uncompressed bytes of output. Return -1 on error, 0 on success. */ | ||
325 | local int gz_skip(state, len) | ||
326 | gz_statep state; | ||
327 | z_off_t len; | ||
328 | { | ||
329 | unsigned n; | ||
330 | |||
331 | /* skip over len bytes or reach end-of-file, whichever comes first */ | ||
332 | while (len) | ||
333 | /* skip over whatever is in output buffer */ | ||
334 | if (state->have) { | ||
335 | n = state->have > len ? (unsigned)len : state->have; | ||
336 | state->have -= n; | ||
337 | state->next += n; | ||
338 | state->pos += n; | ||
339 | len -= n; | ||
340 | } | ||
341 | |||
342 | /* output buffer empty -- return if we're at the end of the input */ | ||
343 | else if (state->eof && state->strm.avail_in == 0) | ||
344 | break; | ||
345 | |||
346 | /* need more data to skip -- load up output buffer */ | ||
347 | else { | ||
348 | /* get more output, looking for header if required */ | ||
349 | if (gz_make(state) == -1) | ||
350 | return -1; | ||
351 | } | ||
352 | return 0; | ||
353 | } | ||
354 | |||
355 | /* -- see zlib.h -- */ | ||
356 | int ZEXPORT gzread(file, buf, len) | ||
357 | gzFile file; | ||
358 | voidp buf; | ||
359 | unsigned len; | ||
360 | { | ||
361 | unsigned got, n; | ||
362 | gz_statep state; | ||
363 | z_streamp strm; | ||
364 | |||
365 | /* get internal structure */ | ||
366 | if (file == NULL) | ||
367 | return -1; | ||
368 | state = (gz_statep)file; | ||
369 | strm = &(state->strm); | ||
370 | |||
371 | /* check that we're reading and that there's no error */ | ||
372 | if (state->mode != GZ_READ || state->err != Z_OK) | ||
373 | return -1; | ||
374 | |||
375 | /* process a skip request */ | ||
376 | if (state->seek) { | ||
377 | state->seek = 0; | ||
378 | if (gz_skip(state, state->skip) == -1) | ||
379 | return -1; | ||
380 | } | ||
381 | |||
382 | /* get len bytes to buf, or less than len if at the end */ | ||
383 | got = 0; | ||
384 | while (len) { | ||
385 | |||
386 | /* first just try copying data from the output buffer */ | ||
387 | if (state->have) { | ||
388 | n = state->have > len ? len : state->have; | ||
389 | memcpy(buf, state->next, n); | ||
390 | state->next += n; | ||
391 | state->have -= n; | ||
392 | } | ||
393 | |||
394 | /* output buffer empty -- return if we're at the end of the input */ | ||
395 | else if (state->eof && strm->avail_in == 0) | ||
396 | break; | ||
397 | |||
398 | /* need output data -- for small len or new stream load up our output | ||
399 | buffer */ | ||
400 | else if (state->how == 0 || len < (state->size << 1)) { | ||
401 | /* get more output, looking for header if required */ | ||
402 | if (gz_make(state) == -1) | ||
403 | return -1; | ||
404 | continue; /* no progress yet -- go back to memcpy() above */ | ||
405 | } | ||
406 | |||
407 | /* large len -- read directly into user buffer */ | ||
408 | else if (state->how == 1) { /* read directly */ | ||
409 | if (gz_load(state, buf, len, &n) == -1) | ||
410 | return -1; | ||
411 | } | ||
412 | |||
413 | /* large len -- decompress directly into user buffer */ | ||
414 | else { /* state->how == 2 */ | ||
415 | strm->avail_out = len; | ||
416 | strm->next_out = buf; | ||
417 | if (gz_decomp(state) == -1) | ||
418 | return -1; | ||
419 | n = state->have; | ||
420 | state->have = 0; | ||
421 | } | ||
422 | |||
423 | /* update progress */ | ||
424 | len -= n; | ||
425 | buf += n; | ||
426 | got += n; | ||
427 | state->pos += n; | ||
428 | } | ||
429 | |||
430 | /* return number of bytes read into user buffer */ | ||
431 | return (int)got; /* len had better fit in int -- interface flaw */ | ||
432 | } | ||
433 | |||
434 | /* -- see zlib.h -- */ | ||
435 | int ZEXPORT gzgetc(file) | ||
436 | gzFile file; | ||
437 | { | ||
438 | int ret; | ||
439 | unsigned char buf[1]; | ||
440 | gz_statep state; | ||
441 | |||
442 | /* get internal structure */ | ||
443 | if (file == NULL) | ||
444 | return -1; | ||
445 | state = (gz_statep)file; | ||
446 | |||
447 | /* check that we're reading and that there's no error */ | ||
448 | if (state->mode != GZ_READ || state->err != Z_OK) | ||
449 | return -1; | ||
450 | |||
451 | /* try output buffer */ | ||
452 | if (state->have) { | ||
453 | state->have--; | ||
454 | state->pos++; | ||
455 | return *(state->next)++; | ||
456 | } | ||
457 | |||
458 | /* nothing there -- try gzread() */ | ||
459 | ret = gzread(file, buf, 1); | ||
460 | return ret < 1 ? -1 : buf[0]; | ||
461 | } | ||
462 | |||
463 | /* -- see zlib.h -- */ | ||
464 | int ZEXPORT gzungetc(c, file) | ||
465 | int c; | ||
466 | gzFile file; | ||
467 | { | ||
468 | gz_statep state; | ||
469 | |||
470 | /* get internal structure */ | ||
471 | if (file == NULL) | ||
472 | return -1; | ||
473 | state = (gz_statep)file; | ||
474 | |||
475 | /* check that we're reading and that there's no error */ | ||
476 | if (state->mode != GZ_READ || state->err != Z_OK) | ||
477 | return -1; | ||
478 | |||
479 | /* process a skip request */ | ||
480 | if (state->seek) { | ||
481 | state->seek = 0; | ||
482 | if (gz_skip(state, state->skip) == -1) | ||
483 | return -1; | ||
484 | } | ||
485 | |||
486 | /* can't push EOF */ | ||
487 | if (c < 0) | ||
488 | return -1; | ||
489 | |||
490 | /* if output buffer empty, put byte at end (allows more pushing) */ | ||
491 | if (state->have == 0) { | ||
492 | state->have = 1; | ||
493 | state->next = state->out + (state->size << 1) - 1; | ||
494 | state->next[0] = c; | ||
495 | state->pos--; | ||
496 | return c; | ||
497 | } | ||
498 | |||
499 | /* if no room, give up (must have already done a gz_ungetc()) */ | ||
500 | if (state->have == (state->size << 1)) | ||
501 | return -1; | ||
502 | |||
503 | /* slide output data if needed and insert byte before existing data */ | ||
504 | if (state->next == state->out) { | ||
505 | unsigned char *src = state->out + state->have; | ||
506 | unsigned char *dest = state->out + (state->size << 1); | ||
507 | while (src > state->out) | ||
508 | *--dest = *--src; | ||
509 | state->next = dest; | ||
510 | } | ||
511 | state->have++; | ||
512 | state->next--; | ||
513 | state->next[0] = c; | ||
514 | state->pos--; | ||
515 | return c; | ||
516 | } | ||
517 | |||
518 | /* -- see zlib.h -- */ | ||
519 | char * ZEXPORT gzgets(file, buf, len) | ||
520 | gzFile file; | ||
521 | char *buf; | ||
522 | int len; | ||
523 | { | ||
524 | unsigned left, n; | ||
525 | char *str; | ||
526 | unsigned char *eol; | ||
527 | gz_statep state; | ||
528 | |||
529 | /* get internal structure */ | ||
530 | if (file == NULL) | ||
531 | return NULL; | ||
532 | state = (gz_statep)file; | ||
533 | |||
534 | /* check that we're reading and that there's no error */ | ||
535 | if (state->mode != GZ_READ || state->err != Z_OK) | ||
536 | return NULL; | ||
537 | |||
538 | /* process a skip request */ | ||
539 | if (state->seek) { | ||
540 | state->seek = 0; | ||
541 | if (gz_skip(state, state->skip) == -1) | ||
542 | return NULL; | ||
543 | } | ||
544 | |||
545 | /* check for a dumb length */ | ||
546 | if (len < 2) | ||
547 | return NULL; | ||
548 | |||
549 | /* copy output bytes up to new line or len - 1, whichever comes first -- | ||
550 | append a terminating zero to the string (we don't check for a zero in | ||
551 | the contents, let the user worry about that) */ | ||
552 | str = buf; | ||
553 | left = (unsigned)len - 1; | ||
554 | do { | ||
555 | /* assure that something is in the output buffer */ | ||
556 | if (state->have == 0) { | ||
557 | if (gz_make(state) == -1) | ||
558 | return NULL; /* error */ | ||
559 | if (state->have == 0) { /* end of file */ | ||
560 | if (buf == str) /* got bupkus */ | ||
561 | return NULL; | ||
562 | break; /* got something -- return it */ | ||
563 | } | ||
564 | } | ||
565 | |||
566 | /* look for end-of-line in current output buffer */ | ||
567 | n = state->have > left ? left : state->have; | ||
568 | eol = memchr(state->next, '\n', n); | ||
569 | if (eol != NULL) | ||
570 | n = (eol - state->next) + 1; | ||
571 | |||
572 | /* copy through end-of-line, or remainder if not found */ | ||
573 | memcpy(buf, state->next, n); | ||
574 | state->have -= n; | ||
575 | state->next += n; | ||
576 | state->pos += n; | ||
577 | left -= n; | ||
578 | buf += n; | ||
579 | } while (left && eol == NULL); | ||
580 | |||
581 | /* found end-of-line or out of space -- terminate string and return it */ | ||
582 | buf[0] = 0; | ||
583 | return str; | ||
584 | } | ||
585 | |||
586 | /* -- see zlib.h -- */ | ||
587 | int ZEXPORT gzdirect(file) | ||
588 | gzFile file; | ||
589 | { | ||
590 | gz_statep state; | ||
591 | |||
592 | /* get internal structure */ | ||
593 | if (file == NULL) | ||
594 | return 0; | ||
595 | state = (gz_statep)file; | ||
596 | |||
597 | /* check that we're reading */ | ||
598 | if (state->mode != GZ_READ) | ||
599 | return 0; | ||
600 | |||
601 | /* return true if reading without decompression */ | ||
602 | return state->how == 1; | ||
603 | } | ||
604 | |||
605 | /* -- see zlib.h -- */ | ||
606 | int ZEXPORT gzclose_r(file) | ||
607 | gzFile file; | ||
608 | { | ||
609 | gz_statep state; | ||
610 | |||
611 | /* get internal structure */ | ||
612 | if (file == NULL) | ||
613 | return Z_STREAM_ERROR; | ||
614 | state = (gz_statep)file; | ||
615 | |||
616 | /* check that we're reading */ | ||
617 | if (state->mode != GZ_READ) | ||
618 | return Z_STREAM_ERROR; | ||
619 | |||
620 | /* free memory and close file */ | ||
621 | if (state->size) { | ||
622 | inflateEnd(&(state->strm)); | ||
623 | free(state->out); | ||
624 | free(state->in); | ||
625 | } | ||
626 | gz_error(state, Z_OK, NULL); | ||
627 | close(state->fd); | ||
628 | free(state); | ||
629 | return Z_OK; | ||
630 | } | ||
631 | |||
632 | #endif /* !OLD_GZIO */ | ||