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5ca28f79 L |
1 | /* gzwrite.c -- zlib functions for writing gzip files |
2 | * Copyright (C) 2004, 2005, 2010, 2011, 2012 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_init OF((gz_statep)); | |
10 | local int gz_comp OF((gz_statep, int)); | |
11 | local int gz_zero OF((gz_statep, z_off64_t)); | |
12 | ||
13 | /* Initialize state for writing a gzip file. Mark initialization by setting | |
14 | state->size to non-zero. Return -1 on failure or 0 on success. */ | |
15 | local int gz_init(state) | |
16 | gz_statep state; | |
17 | { | |
18 | int ret; | |
19 | z_streamp strm = &(state->strm); | |
20 | ||
21 | /* allocate input buffer */ | |
22 | state->in = malloc(state->want); | |
23 | if (state->in == NULL) { | |
24 | gz_error(state, Z_MEM_ERROR, "out of memory"); | |
25 | return -1; | |
26 | } | |
27 | ||
28 | /* only need output buffer and deflate state if compressing */ | |
29 | if (!state->direct) { | |
30 | /* allocate output buffer */ | |
31 | state->out = malloc(state->want); | |
32 | if (state->out == NULL) { | |
33 | free(state->in); | |
34 | gz_error(state, Z_MEM_ERROR, "out of memory"); | |
35 | return -1; | |
36 | } | |
37 | ||
38 | /* allocate deflate memory, set up for gzip compression */ | |
39 | strm->zalloc = Z_NULL; | |
40 | strm->zfree = Z_NULL; | |
41 | strm->opaque = Z_NULL; | |
42 | ret = deflateInit2(strm, state->level, Z_DEFLATED, | |
43 | MAX_WBITS + 16, DEF_MEM_LEVEL, state->strategy); | |
44 | if (ret != Z_OK) { | |
45 | free(state->out); | |
46 | free(state->in); | |
47 | gz_error(state, Z_MEM_ERROR, "out of memory"); | |
48 | return -1; | |
49 | } | |
50 | } | |
51 | ||
52 | /* mark state as initialized */ | |
53 | state->size = state->want; | |
54 | ||
55 | /* initialize write buffer if compressing */ | |
56 | if (!state->direct) { | |
57 | strm->avail_out = state->size; | |
58 | strm->next_out = state->out; | |
59 | state->x.next = strm->next_out; | |
60 | } | |
61 | return 0; | |
62 | } | |
63 | ||
64 | /* Compress whatever is at avail_in and next_in and write to the output file. | |
65 | Return -1 if there is an error writing to the output file, otherwise 0. | |
66 | flush is assumed to be a valid deflate() flush value. If flush is Z_FINISH, | |
67 | then the deflate() state is reset to start a new gzip stream. If gz->direct | |
68 | is true, then simply write to the output file without compressing, and | |
69 | ignore flush. */ | |
70 | local int gz_comp(state, flush) | |
71 | gz_statep state; | |
72 | int flush; | |
73 | { | |
74 | int ret, got; | |
75 | unsigned have; | |
76 | z_streamp strm = &(state->strm); | |
77 | ||
78 | /* allocate memory if this is the first time through */ | |
79 | if (state->size == 0 && gz_init(state) == -1) | |
80 | return -1; | |
81 | ||
82 | /* write directly if requested */ | |
83 | if (state->direct) { | |
84 | got = write(state->fd, strm->next_in, strm->avail_in); | |
85 | if (got < 0 || (unsigned)got != strm->avail_in) { | |
86 | gz_error(state, Z_ERRNO, zstrerror()); | |
87 | return -1; | |
88 | } | |
89 | strm->avail_in = 0; | |
90 | return 0; | |
91 | } | |
92 | ||
93 | /* run deflate() on provided input until it produces no more output */ | |
94 | ret = Z_OK; | |
95 | do { | |
96 | /* write out current buffer contents if full, or if flushing, but if | |
97 | doing Z_FINISH then don't write until we get to Z_STREAM_END */ | |
98 | if (strm->avail_out == 0 || (flush != Z_NO_FLUSH && | |
99 | (flush != Z_FINISH || ret == Z_STREAM_END))) { | |
100 | have = (unsigned)(strm->next_out - state->x.next); | |
101 | if (have && ((got = write(state->fd, state->x.next, have)) < 0 || | |
102 | (unsigned)got != have)) { | |
103 | gz_error(state, Z_ERRNO, zstrerror()); | |
104 | return -1; | |
105 | } | |
106 | if (strm->avail_out == 0) { | |
107 | strm->avail_out = state->size; | |
108 | strm->next_out = state->out; | |
109 | } | |
110 | state->x.next = strm->next_out; | |
111 | } | |
112 | ||
113 | /* compress */ | |
114 | have = strm->avail_out; | |
115 | ret = deflate(strm, flush); | |
116 | if (ret == Z_STREAM_ERROR) { | |
117 | gz_error(state, Z_STREAM_ERROR, | |
118 | "internal error: deflate stream corrupt"); | |
119 | return -1; | |
120 | } | |
121 | have -= strm->avail_out; | |
122 | } while (have); | |
123 | ||
124 | /* if that completed a deflate stream, allow another to start */ | |
125 | if (flush == Z_FINISH) | |
126 | deflateReset(strm); | |
127 | ||
128 | /* all done, no errors */ | |
129 | return 0; | |
130 | } | |
131 | ||
132 | /* Compress len zeros to output. Return -1 on error, 0 on success. */ | |
133 | local int gz_zero(state, len) | |
134 | gz_statep state; | |
135 | z_off64_t len; | |
136 | { | |
137 | int first; | |
138 | unsigned n; | |
139 | z_streamp strm = &(state->strm); | |
140 | ||
141 | /* consume whatever's left in the input buffer */ | |
142 | if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1) | |
143 | return -1; | |
144 | ||
145 | /* compress len zeros (len guaranteed > 0) */ | |
146 | first = 1; | |
147 | while (len) { | |
148 | n = GT_OFF(state->size) || (z_off64_t)state->size > len ? | |
149 | (unsigned)len : state->size; | |
150 | if (first) { | |
151 | memset(state->in, 0, n); | |
152 | first = 0; | |
153 | } | |
154 | strm->avail_in = n; | |
155 | strm->next_in = state->in; | |
156 | state->x.pos += n; | |
157 | if (gz_comp(state, Z_NO_FLUSH) == -1) | |
158 | return -1; | |
159 | len -= n; | |
160 | } | |
161 | return 0; | |
162 | } | |
163 | ||
164 | /* -- see zlib.h -- */ | |
165 | int ZEXPORT gzwrite(file, buf, len) | |
166 | gzFile file; | |
167 | voidpc buf; | |
168 | unsigned len; | |
169 | { | |
170 | unsigned put = len; | |
171 | unsigned n; | |
172 | gz_statep state; | |
173 | z_streamp strm; | |
174 | ||
175 | /* get internal structure */ | |
176 | if (file == NULL) | |
177 | return 0; | |
178 | state = (gz_statep)file; | |
179 | strm = &(state->strm); | |
180 | ||
181 | /* check that we're writing and that there's no error */ | |
182 | if (state->mode != GZ_WRITE || state->err != Z_OK) | |
183 | return 0; | |
184 | ||
185 | /* since an int is returned, make sure len fits in one, otherwise return | |
186 | with an error (this avoids the flaw in the interface) */ | |
187 | if ((int)len < 0) { | |
188 | gz_error(state, Z_DATA_ERROR, "requested length does not fit in int"); | |
189 | return 0; | |
190 | } | |
191 | ||
192 | /* if len is zero, avoid unnecessary operations */ | |
193 | if (len == 0) | |
194 | return 0; | |
195 | ||
196 | /* allocate memory if this is the first time through */ | |
197 | if (state->size == 0 && gz_init(state) == -1) | |
198 | return 0; | |
199 | ||
200 | /* check for seek request */ | |
201 | if (state->seek) { | |
202 | state->seek = 0; | |
203 | if (gz_zero(state, state->skip) == -1) | |
204 | return 0; | |
205 | } | |
206 | ||
207 | /* for small len, copy to input buffer, otherwise compress directly */ | |
208 | if (len < state->size) { | |
209 | /* copy to input buffer, compress when full */ | |
210 | do { | |
211 | if (strm->avail_in == 0) | |
212 | strm->next_in = state->in; | |
213 | n = state->size - strm->avail_in; | |
214 | if (n > len) | |
215 | n = len; | |
216 | memcpy(strm->next_in + strm->avail_in, buf, n); | |
217 | strm->avail_in += n; | |
218 | state->x.pos += n; | |
219 | buf = (char *)buf + n; | |
220 | len -= n; | |
221 | if (len && gz_comp(state, Z_NO_FLUSH) == -1) | |
222 | return 0; | |
223 | } while (len); | |
224 | } | |
225 | else { | |
226 | /* consume whatever's left in the input buffer */ | |
227 | if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1) | |
228 | return 0; | |
229 | ||
230 | /* directly compress user buffer to file */ | |
231 | strm->avail_in = len; | |
232 | strm->next_in = (voidp)buf; | |
233 | state->x.pos += len; | |
234 | if (gz_comp(state, Z_NO_FLUSH) == -1) | |
235 | return 0; | |
236 | } | |
237 | ||
238 | /* input was all buffered or compressed (put will fit in int) */ | |
239 | return (int)put; | |
240 | } | |
241 | ||
242 | /* -- see zlib.h -- */ | |
243 | int ZEXPORT gzputc(file, c) | |
244 | gzFile file; | |
245 | int c; | |
246 | { | |
247 | unsigned char buf[1]; | |
248 | gz_statep state; | |
249 | z_streamp strm; | |
250 | ||
251 | /* get internal structure */ | |
252 | if (file == NULL) | |
253 | return -1; | |
254 | state = (gz_statep)file; | |
255 | strm = &(state->strm); | |
256 | ||
257 | /* check that we're writing and that there's no error */ | |
258 | if (state->mode != GZ_WRITE || state->err != Z_OK) | |
259 | return -1; | |
260 | ||
261 | /* check for seek request */ | |
262 | if (state->seek) { | |
263 | state->seek = 0; | |
264 | if (gz_zero(state, state->skip) == -1) | |
265 | return -1; | |
266 | } | |
267 | ||
268 | /* try writing to input buffer for speed (state->size == 0 if buffer not | |
269 | initialized) */ | |
270 | if (strm->avail_in < state->size) { | |
271 | if (strm->avail_in == 0) | |
272 | strm->next_in = state->in; | |
273 | strm->next_in[strm->avail_in++] = c; | |
274 | state->x.pos++; | |
275 | return c & 0xff; | |
276 | } | |
277 | ||
278 | /* no room in buffer or not initialized, use gz_write() */ | |
279 | buf[0] = c; | |
280 | if (gzwrite(file, buf, 1) != 1) | |
281 | return -1; | |
282 | return c & 0xff; | |
283 | } | |
284 | ||
285 | /* -- see zlib.h -- */ | |
286 | int ZEXPORT gzputs(file, str) | |
287 | gzFile file; | |
288 | const char *str; | |
289 | { | |
290 | int ret; | |
291 | unsigned len; | |
292 | ||
293 | /* write string */ | |
294 | len = (unsigned)strlen(str); | |
295 | ret = gzwrite(file, str, len); | |
296 | return ret == 0 && len != 0 ? -1 : ret; | |
297 | } | |
298 | ||
299 | #if defined(STDC) || defined(Z_HAVE_STDARG_H) | |
300 | #include <stdarg.h> | |
301 | ||
302 | /* -- see zlib.h -- */ | |
303 | int ZEXPORTVA gzprintf (gzFile file, const char *format, ...) | |
304 | { | |
305 | int size, len; | |
306 | gz_statep state; | |
307 | z_streamp strm; | |
308 | va_list va; | |
309 | ||
310 | /* get internal structure */ | |
311 | if (file == NULL) | |
312 | return -1; | |
313 | state = (gz_statep)file; | |
314 | strm = &(state->strm); | |
315 | ||
316 | /* check that we're writing and that there's no error */ | |
317 | if (state->mode != GZ_WRITE || state->err != Z_OK) | |
318 | return 0; | |
319 | ||
320 | /* make sure we have some buffer space */ | |
321 | if (state->size == 0 && gz_init(state) == -1) | |
322 | return 0; | |
323 | ||
324 | /* check for seek request */ | |
325 | if (state->seek) { | |
326 | state->seek = 0; | |
327 | if (gz_zero(state, state->skip) == -1) | |
328 | return 0; | |
329 | } | |
330 | ||
331 | /* consume whatever's left in the input buffer */ | |
332 | if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1) | |
333 | return 0; | |
334 | ||
335 | /* do the printf() into the input buffer, put length in len */ | |
336 | size = (int)(state->size); | |
337 | state->in[size - 1] = 0; | |
338 | va_start(va, format); | |
339 | #ifdef NO_vsnprintf | |
340 | # ifdef HAS_vsprintf_void | |
341 | (void)vsprintf((char *)(state->in), format, va); | |
342 | va_end(va); | |
343 | for (len = 0; len < size; len++) | |
344 | if (state->in[len] == 0) break; | |
345 | # else | |
346 | len = vsprintf((char *)(state->in), format, va); | |
347 | va_end(va); | |
348 | # endif | |
349 | #else | |
350 | # ifdef HAS_vsnprintf_void | |
351 | (void)vsnprintf((char *)(state->in), size, format, va); | |
352 | va_end(va); | |
353 | len = strlen((char *)(state->in)); | |
354 | # else | |
355 | len = vsnprintf((char *)(state->in), size, format, va); | |
356 | va_end(va); | |
357 | # endif | |
358 | #endif | |
359 | ||
360 | /* check that printf() results fit in buffer */ | |
361 | if (len <= 0 || len >= (int)size || state->in[size - 1] != 0) | |
362 | return 0; | |
363 | ||
364 | /* update buffer and position, defer compression until needed */ | |
365 | strm->avail_in = (unsigned)len; | |
366 | strm->next_in = state->in; | |
367 | state->x.pos += len; | |
368 | return len; | |
369 | } | |
370 | ||
371 | #else /* !STDC && !Z_HAVE_STDARG_H */ | |
372 | ||
373 | /* -- see zlib.h -- */ | |
374 | int ZEXPORTVA gzprintf (file, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, | |
375 | a11, a12, a13, a14, a15, a16, a17, a18, a19, a20) | |
376 | gzFile file; | |
377 | const char *format; | |
378 | int a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, | |
379 | a11, a12, a13, a14, a15, a16, a17, a18, a19, a20; | |
380 | { | |
381 | int size, len; | |
382 | gz_statep state; | |
383 | z_streamp strm; | |
384 | ||
385 | /* get internal structure */ | |
386 | if (file == NULL) | |
387 | return -1; | |
388 | state = (gz_statep)file; | |
389 | strm = &(state->strm); | |
390 | ||
391 | /* check that can really pass pointer in ints */ | |
392 | if (sizeof(int) != sizeof(void *)) | |
393 | return 0; | |
394 | ||
395 | /* check that we're writing and that there's no error */ | |
396 | if (state->mode != GZ_WRITE || state->err != Z_OK) | |
397 | return 0; | |
398 | ||
399 | /* make sure we have some buffer space */ | |
400 | if (state->size == 0 && gz_init(state) == -1) | |
401 | return 0; | |
402 | ||
403 | /* check for seek request */ | |
404 | if (state->seek) { | |
405 | state->seek = 0; | |
406 | if (gz_zero(state, state->skip) == -1) | |
407 | return 0; | |
408 | } | |
409 | ||
410 | /* consume whatever's left in the input buffer */ | |
411 | if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1) | |
412 | return 0; | |
413 | ||
414 | /* do the printf() into the input buffer, put length in len */ | |
415 | size = (int)(state->size); | |
416 | state->in[size - 1] = 0; | |
417 | #ifdef NO_snprintf | |
418 | # ifdef HAS_sprintf_void | |
419 | sprintf((char *)(state->in), format, a1, a2, a3, a4, a5, a6, a7, a8, | |
420 | a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20); | |
421 | for (len = 0; len < size; len++) | |
422 | if (state->in[len] == 0) break; | |
423 | # else | |
424 | len = sprintf((char *)(state->in), format, a1, a2, a3, a4, a5, a6, a7, a8, | |
425 | a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20); | |
426 | # endif | |
427 | #else | |
428 | # ifdef HAS_snprintf_void | |
429 | snprintf((char *)(state->in), size, format, a1, a2, a3, a4, a5, a6, a7, a8, | |
430 | a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20); | |
431 | len = strlen((char *)(state->in)); | |
432 | # else | |
433 | len = snprintf((char *)(state->in), size, format, a1, a2, a3, a4, a5, a6, | |
434 | a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, | |
435 | a19, a20); | |
436 | # endif | |
437 | #endif | |
438 | ||
439 | /* check that printf() results fit in buffer */ | |
440 | if (len <= 0 || len >= (int)size || state->in[size - 1] != 0) | |
441 | return 0; | |
442 | ||
443 | /* update buffer and position, defer compression until needed */ | |
444 | strm->avail_in = (unsigned)len; | |
445 | strm->next_in = state->in; | |
446 | state->x.pos += len; | |
447 | return len; | |
448 | } | |
449 | ||
450 | #endif | |
451 | ||
452 | /* -- see zlib.h -- */ | |
453 | int ZEXPORT gzflush(file, flush) | |
454 | gzFile file; | |
455 | int flush; | |
456 | { | |
457 | gz_statep state; | |
458 | ||
459 | /* get internal structure */ | |
460 | if (file == NULL) | |
461 | return -1; | |
462 | state = (gz_statep)file; | |
463 | ||
464 | /* check that we're writing and that there's no error */ | |
465 | if (state->mode != GZ_WRITE || state->err != Z_OK) | |
466 | return Z_STREAM_ERROR; | |
467 | ||
468 | /* check flush parameter */ | |
469 | if (flush < 0 || flush > Z_FINISH) | |
470 | return Z_STREAM_ERROR; | |
471 | ||
472 | /* check for seek request */ | |
473 | if (state->seek) { | |
474 | state->seek = 0; | |
475 | if (gz_zero(state, state->skip) == -1) | |
476 | return -1; | |
477 | } | |
478 | ||
479 | /* compress remaining data with requested flush */ | |
480 | gz_comp(state, flush); | |
481 | return state->err; | |
482 | } | |
483 | ||
484 | /* -- see zlib.h -- */ | |
485 | int ZEXPORT gzsetparams(file, level, strategy) | |
486 | gzFile file; | |
487 | int level; | |
488 | int strategy; | |
489 | { | |
490 | gz_statep state; | |
491 | z_streamp strm; | |
492 | ||
493 | /* get internal structure */ | |
494 | if (file == NULL) | |
495 | return Z_STREAM_ERROR; | |
496 | state = (gz_statep)file; | |
497 | strm = &(state->strm); | |
498 | ||
499 | /* check that we're writing and that there's no error */ | |
500 | if (state->mode != GZ_WRITE || state->err != Z_OK) | |
501 | return Z_STREAM_ERROR; | |
502 | ||
503 | /* if no change is requested, then do nothing */ | |
504 | if (level == state->level && strategy == state->strategy) | |
505 | return Z_OK; | |
506 | ||
507 | /* check for seek request */ | |
508 | if (state->seek) { | |
509 | state->seek = 0; | |
510 | if (gz_zero(state, state->skip) == -1) | |
511 | return -1; | |
512 | } | |
513 | ||
514 | /* change compression parameters for subsequent input */ | |
515 | if (state->size) { | |
516 | /* flush previous input with previous parameters before changing */ | |
517 | if (strm->avail_in && gz_comp(state, Z_PARTIAL_FLUSH) == -1) | |
518 | return state->err; | |
519 | deflateParams(strm, level, strategy); | |
520 | } | |
521 | state->level = level; | |
522 | state->strategy = strategy; | |
523 | return Z_OK; | |
524 | } | |
525 | ||
526 | /* -- see zlib.h -- */ | |
527 | int ZEXPORT gzclose_w(file) | |
528 | gzFile file; | |
529 | { | |
530 | int ret = Z_OK; | |
531 | gz_statep state; | |
532 | ||
533 | /* get internal structure */ | |
534 | if (file == NULL) | |
535 | return Z_STREAM_ERROR; | |
536 | state = (gz_statep)file; | |
537 | ||
538 | /* check that we're writing */ | |
539 | if (state->mode != GZ_WRITE) | |
540 | return Z_STREAM_ERROR; | |
541 | ||
542 | /* check for seek request */ | |
543 | if (state->seek) { | |
544 | state->seek = 0; | |
545 | if (gz_zero(state, state->skip) == -1) | |
546 | ret = state->err; | |
547 | } | |
548 | ||
549 | /* flush, free memory, and close file */ | |
550 | if (state->size) { | |
551 | if (gz_comp(state, Z_FINISH) == -1) | |
552 | ret = state->err; | |
553 | if (!state->direct) { | |
554 | (void)deflateEnd(&(state->strm)); | |
555 | free(state->out); | |
556 | } | |
557 | free(state->in); | |
558 | } | |
559 | gz_error(state, Z_OK, NULL); | |
560 | free(state->path); | |
561 | if (close(state->fd) == -1) | |
562 | ret = Z_ERRNO; | |
563 | free(state); | |
564 | return ret; | |
565 | } |