1 /*
2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
3 *
4 * This code is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 only, as
6 * published by the Free Software Foundation. Oracle designates this
7 * particular file as subject to the "Classpath" exception as provided
8 * by Oracle in the LICENSE file that accompanied this code.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 */
24
25 /* gzwrite.c -- zlib functions for writing gzip files
26 * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013 Mark Adler
27 * For conditions of distribution and use, see copyright notice in zlib.h
28 */
29
30 #include "gzguts.h"
31
32 /* Local functions */
33 local int gz_init OF((gz_statep));
34 local int gz_comp OF((gz_statep, int));
35 local int gz_zero OF((gz_statep, z_off64_t));
36
37 /* Initialize state for writing a gzip file. Mark initialization by setting
38 state->size to non-zero. Return -1 on failure or 0 on success. */
39 local int gz_init(state)
40 gz_statep state;
41 {
42 int ret;
43 z_streamp strm = &(state->strm);
44
45 /* allocate input buffer */
46 state->in = (unsigned char *)malloc(state->want);
47 if (state->in == NULL) {
48 gz_error(state, Z_MEM_ERROR, "out of memory");
49 return -1;
50 }
51
52 /* only need output buffer and deflate state if compressing */
53 if (!state->direct) {
54 /* allocate output buffer */
55 state->out = (unsigned char *)malloc(state->want);
56 if (state->out == NULL) {
57 free(state->in);
58 gz_error(state, Z_MEM_ERROR, "out of memory");
59 return -1;
60 }
61
62 /* allocate deflate memory, set up for gzip compression */
63 strm->zalloc = Z_NULL;
64 strm->zfree = Z_NULL;
65 strm->opaque = Z_NULL;
66 ret = deflateInit2(strm, state->level, Z_DEFLATED,
67 MAX_WBITS + 16, DEF_MEM_LEVEL, state->strategy);
68 if (ret != Z_OK) {
69 free(state->out);
70 free(state->in);
71 gz_error(state, Z_MEM_ERROR, "out of memory");
72 return -1;
73 }
74 }
75
76 /* mark state as initialized */
77 state->size = state->want;
78
79 /* initialize write buffer if compressing */
80 if (!state->direct) {
81 strm->avail_out = state->size;
82 strm->next_out = state->out;
83 state->x.next = strm->next_out;
84 }
85 return 0;
86 }
87
88 /* Compress whatever is at avail_in and next_in and write to the output file.
89 Return -1 if there is an error writing to the output file, otherwise 0.
90 flush is assumed to be a valid deflate() flush value. If flush is Z_FINISH,
91 then the deflate() state is reset to start a new gzip stream. If gz->direct
92 is true, then simply write to the output file without compressing, and
93 ignore flush. */
94 local int gz_comp(state, flush)
95 gz_statep state;
96 int flush;
97 {
98 int ret, got;
99 unsigned have;
100 z_streamp strm = &(state->strm);
101
102 /* allocate memory if this is the first time through */
103 if (state->size == 0 && gz_init(state) == -1)
104 return -1;
105
106 /* write directly if requested */
107 if (state->direct) {
108 got = write(state->fd, strm->next_in, strm->avail_in);
109 if (got < 0 || (unsigned)got != strm->avail_in) {
110 gz_error(state, Z_ERRNO, zstrerror());
111 return -1;
112 }
113 strm->avail_in = 0;
114 return 0;
115 }
116
117 /* run deflate() on provided input until it produces no more output */
118 ret = Z_OK;
119 do {
120 /* write out current buffer contents if full, or if flushing, but if
121 doing Z_FINISH then don't write until we get to Z_STREAM_END */
122 if (strm->avail_out == 0 || (flush != Z_NO_FLUSH &&
123 (flush != Z_FINISH || ret == Z_STREAM_END))) {
124 have = (unsigned)(strm->next_out - state->x.next);
125 if (have && ((got = write(state->fd, state->x.next, have)) < 0 ||
126 (unsigned)got != have)) {
127 gz_error(state, Z_ERRNO, zstrerror());
128 return -1;
129 }
130 if (strm->avail_out == 0) {
131 strm->avail_out = state->size;
132 strm->next_out = state->out;
133 }
134 state->x.next = strm->next_out;
135 }
136
137 /* compress */
138 have = strm->avail_out;
139 ret = deflate(strm, flush);
140 if (ret == Z_STREAM_ERROR) {
141 gz_error(state, Z_STREAM_ERROR,
142 "internal error: deflate stream corrupt");
143 return -1;
144 }
145 have -= strm->avail_out;
146 } while (have);
147
148 /* if that completed a deflate stream, allow another to start */
149 if (flush == Z_FINISH)
150 deflateReset(strm);
151
152 /* all done, no errors */
153 return 0;
154 }
155
156 /* Compress len zeros to output. Return -1 on error, 0 on success. */
157 local int gz_zero(state, len)
158 gz_statep state;
159 z_off64_t len;
160 {
161 int first;
162 unsigned n;
163 z_streamp strm = &(state->strm);
164
165 /* consume whatever's left in the input buffer */
166 if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
167 return -1;
168
169 /* compress len zeros (len guaranteed > 0) */
170 first = 1;
171 while (len) {
172 n = GT_OFF(state->size) || (z_off64_t)state->size > len ?
173 (unsigned)len : state->size;
174 if (first) {
175 memset(state->in, 0, n);
176 first = 0;
177 }
178 strm->avail_in = n;
179 strm->next_in = state->in;
180 state->x.pos += n;
181 if (gz_comp(state, Z_NO_FLUSH) == -1)
182 return -1;
183 len -= n;
184 }
185 return 0;
186 }
187
188 /* -- see zlib.h -- */
189 int ZEXPORT gzwrite(file, buf, len)
190 gzFile file;
191 voidpc buf;
192 unsigned len;
193 {
194 unsigned put = len;
195 gz_statep state;
196 z_streamp strm;
197
198 /* get internal structure */
199 if (file == NULL)
200 return 0;
201 state = (gz_statep)file;
202 strm = &(state->strm);
203
204 /* check that we're writing and that there's no error */
205 if (state->mode != GZ_WRITE || state->err != Z_OK)
206 return 0;
207
208 /* since an int is returned, make sure len fits in one, otherwise return
209 with an error (this avoids the flaw in the interface) */
210 if ((int)len < 0) {
211 gz_error(state, Z_DATA_ERROR, "requested length does not fit in int");
212 return 0;
213 }
214
215 /* if len is zero, avoid unnecessary operations */
216 if (len == 0)
217 return 0;
218
219 /* allocate memory if this is the first time through */
220 if (state->size == 0 && gz_init(state) == -1)
221 return 0;
222
223 /* check for seek request */
224 if (state->seek) {
225 state->seek = 0;
226 if (gz_zero(state, state->skip) == -1)
227 return 0;
228 }
229
230 /* for small len, copy to input buffer, otherwise compress directly */
231 if (len < state->size) {
232 /* copy to input buffer, compress when full */
233 do {
234 unsigned have, copy;
235
236 if (strm->avail_in == 0)
237 strm->next_in = state->in;
238 have = (unsigned)((strm->next_in + strm->avail_in) - state->in);
239 copy = state->size - have;
240 if (copy > len)
241 copy = len;
242 memcpy(state->in + have, buf, copy);
243 strm->avail_in += copy;
244 state->x.pos += copy;
245 buf = (const char *)buf + copy;
246 len -= copy;
247 if (len && gz_comp(state, Z_NO_FLUSH) == -1)
248 return 0;
249 } while (len);
250 }
251 else {
252 /* consume whatever's left in the input buffer */
253 if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
254 return 0;
255
256 /* directly compress user buffer to file */
257 strm->avail_in = len;
258 strm->next_in = (z_const Bytef *)buf;
259 state->x.pos += len;
260 if (gz_comp(state, Z_NO_FLUSH) == -1)
261 return 0;
262 }
263
264 /* input was all buffered or compressed (put will fit in int) */
265 return (int)put;
266 }
267
268 /* -- see zlib.h -- */
269 int ZEXPORT gzputc(file, c)
270 gzFile file;
271 int c;
272 {
273 unsigned have;
274 unsigned char buf[1];
275 gz_statep state;
276 z_streamp strm;
277
278 /* get internal structure */
279 if (file == NULL)
280 return -1;
281 state = (gz_statep)file;
282 strm = &(state->strm);
283
284 /* check that we're writing and that there's no error */
285 if (state->mode != GZ_WRITE || state->err != Z_OK)
286 return -1;
287
288 /* check for seek request */
289 if (state->seek) {
290 state->seek = 0;
291 if (gz_zero(state, state->skip) == -1)
292 return -1;
293 }
294
295 /* try writing to input buffer for speed (state->size == 0 if buffer not
296 initialized) */
297 if (state->size) {
298 if (strm->avail_in == 0)
299 strm->next_in = state->in;
300 have = (unsigned)((strm->next_in + strm->avail_in) - state->in);
301 if (have < state->size) {
302 state->in[have] = c;
303 strm->avail_in++;
304 state->x.pos++;
305 return c & 0xff;
306 }
307 }
308
309 /* no room in buffer or not initialized, use gz_write() */
310 buf[0] = c;
311 if (gzwrite(file, buf, 1) != 1)
312 return -1;
313 return c & 0xff;
314 }
315
316 /* -- see zlib.h -- */
317 int ZEXPORT gzputs(file, str)
318 gzFile file;
319 const char *str;
320 {
321 int ret;
322 unsigned len;
323
324 /* write string */
325 len = (unsigned)strlen(str);
326 ret = gzwrite(file, str, len);
327 return ret == 0 && len != 0 ? -1 : ret;
328 }
329
330 #if defined(STDC) || defined(Z_HAVE_STDARG_H)
331 #include <stdarg.h>
332
333 /* -- see zlib.h -- */
334 int ZEXPORTVA gzvprintf(gzFile file, const char *format, va_list va)
335 {
336 int size, len;
337 gz_statep state;
338 z_streamp strm;
339
340 /* get internal structure */
341 if (file == NULL)
342 return -1;
343 state = (gz_statep)file;
344 strm = &(state->strm);
345
346 /* check that we're writing and that there's no error */
347 if (state->mode != GZ_WRITE || state->err != Z_OK)
348 return 0;
349
350 /* make sure we have some buffer space */
351 if (state->size == 0 && gz_init(state) == -1)
352 return 0;
353
354 /* check for seek request */
355 if (state->seek) {
356 state->seek = 0;
357 if (gz_zero(state, state->skip) == -1)
358 return 0;
359 }
360
361 /* consume whatever's left in the input buffer */
362 if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
363 return 0;
364
365 /* do the printf() into the input buffer, put length in len */
366 size = (int)(state->size);
367 state->in[size - 1] = 0;
368 #ifdef NO_vsnprintf
369 # ifdef HAS_vsprintf_void
370 (void)vsprintf((char *)(state->in), format, va);
371 for (len = 0; len < size; len++)
372 if (state->in[len] == 0) break;
373 # else
374 len = vsprintf((char *)(state->in), format, va);
375 # endif
376 #else
377 # ifdef HAS_vsnprintf_void
378 (void)vsnprintf((char *)(state->in), size, format, va);
379 len = strlen((char *)(state->in));
380 # else
381 len = vsnprintf((char *)(state->in), size, format, va);
382 # endif
383 #endif
384
385 /* check that printf() results fit in buffer */
386 if (len <= 0 || len >= (int)size || state->in[size - 1] != 0)
387 return 0;
388
389 /* update buffer and position, defer compression until needed */
390 strm->avail_in = (unsigned)len;
391 strm->next_in = state->in;
392 state->x.pos += len;
393 return len;
394 }
395
396 int ZEXPORTVA gzprintf(gzFile file, const char *format, ...)
397 {
398 va_list va;
399 int ret;
400
401 va_start(va, format);
402 ret = gzvprintf(file, format, va);
403 va_end(va);
404 return ret;
405 }
406
407 #else /* !STDC && !Z_HAVE_STDARG_H */
408
409 /* -- see zlib.h -- */
410 int ZEXPORTVA gzprintf (file, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
411 a11, a12, a13, a14, a15, a16, a17, a18, a19, a20)
412 gzFile file;
413 const char *format;
414 int a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
415 a11, a12, a13, a14, a15, a16, a17, a18, a19, a20;
416 {
417 int size, len;
418 gz_statep state;
419 z_streamp strm;
420
421 /* get internal structure */
422 if (file == NULL)
423 return -1;
424 state = (gz_statep)file;
425 strm = &(state->strm);
426
427 /* check that can really pass pointer in ints */
428 if (sizeof(int) != sizeof(void *))
429 return 0;
430
431 /* check that we're writing and that there's no error */
432 if (state->mode != GZ_WRITE || state->err != Z_OK)
433 return 0;
434
435 /* make sure we have some buffer space */
436 if (state->size == 0 && gz_init(state) == -1)
437 return 0;
438
439 /* check for seek request */
440 if (state->seek) {
441 state->seek = 0;
442 if (gz_zero(state, state->skip) == -1)
443 return 0;
444 }
445
446 /* consume whatever's left in the input buffer */
447 if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
448 return 0;
449
450 /* do the printf() into the input buffer, put length in len */
451 size = (int)(state->size);
452 state->in[size - 1] = 0;
453 #ifdef NO_snprintf
454 # ifdef HAS_sprintf_void
455 sprintf((char *)(state->in), format, a1, a2, a3, a4, a5, a6, a7, a8,
456 a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
457 for (len = 0; len < size; len++)
458 if (state->in[len] == 0) break;
459 # else
460 len = sprintf((char *)(state->in), format, a1, a2, a3, a4, a5, a6, a7, a8,
461 a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
462 # endif
463 #else
464 # ifdef HAS_snprintf_void
465 snprintf((char *)(state->in), size, format, a1, a2, a3, a4, a5, a6, a7, a8,
466 a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
467 len = strlen((char *)(state->in));
468 # else
469 len = snprintf((char *)(state->in), size, format, a1, a2, a3, a4, a5, a6,
470 a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18,
471 a19, a20);
472 # endif
473 #endif
474
475 /* check that printf() results fit in buffer */
476 if (len <= 0 || len >= (int)size || state->in[size - 1] != 0)
477 return 0;
478
479 /* update buffer and position, defer compression until needed */
480 strm->avail_in = (unsigned)len;
481 strm->next_in = state->in;
482 state->x.pos += len;
483 return len;
484 }
485
486 #endif
487
488 /* -- see zlib.h -- */
489 int ZEXPORT gzflush(file, flush)
490 gzFile file;
491 int flush;
492 {
493 gz_statep state;
494
495 /* get internal structure */
496 if (file == NULL)
497 return -1;
498 state = (gz_statep)file;
499
500 /* check that we're writing and that there's no error */
501 if (state->mode != GZ_WRITE || state->err != Z_OK)
502 return Z_STREAM_ERROR;
503
504 /* check flush parameter */
505 if (flush < 0 || flush > Z_FINISH)
506 return Z_STREAM_ERROR;
507
508 /* check for seek request */
509 if (state->seek) {
510 state->seek = 0;
511 if (gz_zero(state, state->skip) == -1)
512 return -1;
513 }
514
515 /* compress remaining data with requested flush */
516 gz_comp(state, flush);
517 return state->err;
518 }
519
520 /* -- see zlib.h -- */
521 int ZEXPORT gzsetparams(file, level, strategy)
522 gzFile file;
523 int level;
524 int strategy;
525 {
526 gz_statep state;
527 z_streamp strm;
528
529 /* get internal structure */
530 if (file == NULL)
531 return Z_STREAM_ERROR;
532 state = (gz_statep)file;
533 strm = &(state->strm);
534
535 /* check that we're writing and that there's no error */
536 if (state->mode != GZ_WRITE || state->err != Z_OK)
537 return Z_STREAM_ERROR;
538
539 /* if no change is requested, then do nothing */
540 if (level == state->level && strategy == state->strategy)
541 return Z_OK;
542
543 /* check for seek request */
544 if (state->seek) {
545 state->seek = 0;
546 if (gz_zero(state, state->skip) == -1)
547 return -1;
548 }
549
550 /* change compression parameters for subsequent input */
551 if (state->size) {
552 /* flush previous input with previous parameters before changing */
553 if (strm->avail_in && gz_comp(state, Z_PARTIAL_FLUSH) == -1)
554 return state->err;
555 deflateParams(strm, level, strategy);
556 }
557 state->level = level;
558 state->strategy = strategy;
559 return Z_OK;
560 }
561
562 /* -- see zlib.h -- */
563 int ZEXPORT gzclose_w(file)
564 gzFile file;
565 {
566 int ret = Z_OK;
567 gz_statep state;
568
569 /* get internal structure */
570 if (file == NULL)
571 return Z_STREAM_ERROR;
572 state = (gz_statep)file;
573
574 /* check that we're writing */
575 if (state->mode != GZ_WRITE)
576 return Z_STREAM_ERROR;
577
578 /* check for seek request */
579 if (state->seek) {
580 state->seek = 0;
581 if (gz_zero(state, state->skip) == -1)
582 ret = state->err;
583 }
584
585 /* flush, free memory, and close file */
586 if (gz_comp(state, Z_FINISH) == -1)
587 ret = state->err;
588 if (state->size) {
589 if (!state->direct) {
590 (void)deflateEnd(&(state->strm));
591 free(state->out);
592 }
593 free(state->in);
594 }
595 gz_error(state, Z_OK, NULL);
596 free(state->path);
597 if (close(state->fd) == -1)
598 ret = Z_ERRNO;
599 free(state);
600 return ret;
601 }