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comparison: security/nss/lib/zlib/gzwrite.c

security/nss/lib/zlib/gzwrite.c

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-1:000000000000 0:e9f73537834d
1 /* gzwrite.c -- zlib functions for writing 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_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 and output buffers */
22 state->in = malloc(state->want);
23 state->out = malloc(state->want);
24 if (state->in == NULL || state->out == NULL) {
25 if (state->out != NULL)
26 free(state->out);
27 if (state->in != NULL)
28 free(state->in);
29 gz_error(state, Z_MEM_ERROR, "out of memory");
30 return -1;
31 }
32
33 /* allocate deflate memory, set up for gzip compression */
34 strm->zalloc = Z_NULL;
35 strm->zfree = Z_NULL;
36 strm->opaque = Z_NULL;
37 ret = deflateInit2(strm, state->level, Z_DEFLATED,
38 15 + 16, 8, state->strategy);
39 if (ret != Z_OK) {
40 free(state->in);
41 gz_error(state, Z_MEM_ERROR, "out of memory");
42 return -1;
43 }
44
45 /* mark state as initialized */
46 state->size = state->want;
47
48 /* initialize write buffer */
49 strm->avail_out = state->size;
50 strm->next_out = state->out;
51 state->next = strm->next_out;
52 return 0;
53 }
54
55 /* Compress whatever is at avail_in and next_in and write to the output file.
56 Return -1 if there is an error writing to the output file, otherwise 0.
57 flush is assumed to be a valid deflate() flush value. If flush is Z_FINISH,
58 then the deflate() state is reset to start a new gzip stream. */
59 local int gz_comp(state, flush)
60 gz_statep state;
61 int flush;
62 {
63 int ret, got;
64 unsigned have;
65 z_streamp strm = &(state->strm);
66
67 /* allocate memory if this is the first time through */
68 if (state->size == 0 && gz_init(state) == -1)
69 return -1;
70
71 /* run deflate() on provided input until it produces no more output */
72 ret = Z_OK;
73 do {
74 /* write out current buffer contents if full, or if flushing, but if
75 doing Z_FINISH then don't write until we get to Z_STREAM_END */
76 if (strm->avail_out == 0 || (flush != Z_NO_FLUSH &&
77 (flush != Z_FINISH || ret == Z_STREAM_END))) {
78 have = (unsigned)(strm->next_out - state->next);
79 if (have && ((got = write(state->fd, state->next, have)) < 0 ||
80 (unsigned)got != have)) {
81 gz_error(state, Z_ERRNO, zstrerror());
82 return -1;
83 }
84 if (strm->avail_out == 0) {
85 strm->avail_out = state->size;
86 strm->next_out = state->out;
87 }
88 state->next = strm->next_out;
89 }
90
91 /* compress */
92 have = strm->avail_out;
93 ret = deflate(strm, flush);
94 if (ret == Z_STREAM_ERROR) {
95 gz_error(state, Z_STREAM_ERROR,
96 "internal error: deflate stream corrupt");
97 return -1;
98 }
99 have -= strm->avail_out;
100 } while (have);
101
102 /* if that completed a deflate stream, allow another to start */
103 if (flush == Z_FINISH)
104 deflateReset(strm);
105
106 /* all done, no errors */
107 return 0;
108 }
109
110 /* Compress len zeros to output. Return -1 on error, 0 on success. */
111 local int gz_zero(state, len)
112 gz_statep state;
113 z_off64_t len;
114 {
115 int first;
116 unsigned n;
117 z_streamp strm = &(state->strm);
118
119 /* consume whatever's left in the input buffer */
120 if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
121 return -1;
122
123 /* compress len zeros (len guaranteed > 0) */
124 first = 1;
125 while (len) {
126 n = GT_OFF(state->size) || (z_off64_t)state->size > len ?
127 (unsigned)len : state->size;
128 if (first) {
129 memset(state->in, 0, n);
130 first = 0;
131 }
132 strm->avail_in = n;
133 strm->next_in = state->in;
134 state->pos += n;
135 if (gz_comp(state, Z_NO_FLUSH) == -1)
136 return -1;
137 len -= n;
138 }
139 return 0;
140 }
141
142 /* -- see zlib.h -- */
143 int ZEXPORT gzwrite(file, buf, len)
144 gzFile file;
145 voidpc buf;
146 unsigned len;
147 {
148 unsigned put = len;
149 unsigned n;
150 gz_statep state;
151 z_streamp strm;
152
153 /* get internal structure */
154 if (file == NULL)
155 return 0;
156 state = (gz_statep)file;
157 strm = &(state->strm);
158
159 /* check that we're writing and that there's no error */
160 if (state->mode != GZ_WRITE || state->err != Z_OK)
161 return 0;
162
163 /* since an int is returned, make sure len fits in one, otherwise return
164 with an error (this avoids the flaw in the interface) */
165 if ((int)len < 0) {
166 gz_error(state, Z_BUF_ERROR, "requested length does not fit in int");
167 return 0;
168 }
169
170 /* if len is zero, avoid unnecessary operations */
171 if (len == 0)
172 return 0;
173
174 /* allocate memory if this is the first time through */
175 if (state->size == 0 && gz_init(state) == -1)
176 return 0;
177
178 /* check for seek request */
179 if (state->seek) {
180 state->seek = 0;
181 if (gz_zero(state, state->skip) == -1)
182 return 0;
183 }
184
185 /* for small len, copy to input buffer, otherwise compress directly */
186 if (len < state->size) {
187 /* copy to input buffer, compress when full */
188 do {
189 if (strm->avail_in == 0)
190 strm->next_in = state->in;
191 n = state->size - strm->avail_in;
192 if (n > len)
193 n = len;
194 memcpy(strm->next_in + strm->avail_in, buf, n);
195 strm->avail_in += n;
196 state->pos += n;
197 buf = (char *)buf + n;
198 len -= n;
199 if (len && gz_comp(state, Z_NO_FLUSH) == -1)
200 return 0;
201 } while (len);
202 }
203 else {
204 /* consume whatever's left in the input buffer */
205 if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
206 return 0;
207
208 /* directly compress user buffer to file */
209 strm->avail_in = len;
210 strm->next_in = (voidp)buf;
211 state->pos += len;
212 if (gz_comp(state, Z_NO_FLUSH) == -1)
213 return 0;
214 }
215
216 /* input was all buffered or compressed (put will fit in int) */
217 return (int)put;
218 }
219
220 /* -- see zlib.h -- */
221 int ZEXPORT gzputc(file, c)
222 gzFile file;
223 int c;
224 {
225 unsigned char buf[1];
226 gz_statep state;
227 z_streamp strm;
228
229 /* get internal structure */
230 if (file == NULL)
231 return -1;
232 state = (gz_statep)file;
233 strm = &(state->strm);
234
235 /* check that we're writing and that there's no error */
236 if (state->mode != GZ_WRITE || state->err != Z_OK)
237 return -1;
238
239 /* check for seek request */
240 if (state->seek) {
241 state->seek = 0;
242 if (gz_zero(state, state->skip) == -1)
243 return -1;
244 }
245
246 /* try writing to input buffer for speed (state->size == 0 if buffer not
247 initialized) */
248 if (strm->avail_in < state->size) {
249 if (strm->avail_in == 0)
250 strm->next_in = state->in;
251 strm->next_in[strm->avail_in++] = c;
252 state->pos++;
253 return c;
254 }
255
256 /* no room in buffer or not initialized, use gz_write() */
257 buf[0] = c;
258 if (gzwrite(file, buf, 1) != 1)
259 return -1;
260 return c;
261 }
262
263 /* -- see zlib.h -- */
264 int ZEXPORT gzputs(file, str)
265 gzFile file;
266 const char *str;
267 {
268 int ret;
269 unsigned len;
270
271 /* write string */
272 len = (unsigned)strlen(str);
273 ret = gzwrite(file, str, len);
274 return ret == 0 && len != 0 ? -1 : ret;
275 }
276
277 #ifdef STDC
278 #include <stdarg.h>
279
280 /* -- see zlib.h -- */
281 int ZEXPORTVA gzprintf (gzFile file, const char *format, ...)
282 {
283 int size, len;
284 gz_statep state;
285 z_streamp strm;
286 va_list va;
287
288 /* get internal structure */
289 if (file == NULL)
290 return -1;
291 state = (gz_statep)file;
292 strm = &(state->strm);
293
294 /* check that we're writing and that there's no error */
295 if (state->mode != GZ_WRITE || state->err != Z_OK)
296 return 0;
297
298 /* make sure we have some buffer space */
299 if (state->size == 0 && gz_init(state) == -1)
300 return 0;
301
302 /* check for seek request */
303 if (state->seek) {
304 state->seek = 0;
305 if (gz_zero(state, state->skip) == -1)
306 return 0;
307 }
308
309 /* consume whatever's left in the input buffer */
310 if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
311 return 0;
312
313 /* do the printf() into the input buffer, put length in len */
314 size = (int)(state->size);
315 state->in[size - 1] = 0;
316 va_start(va, format);
317 #ifdef NO_vsnprintf
318 # ifdef HAS_vsprintf_void
319 (void)vsprintf(state->in, format, va);
320 va_end(va);
321 for (len = 0; len < size; len++)
322 if (state->in[len] == 0) break;
323 # else
324 len = vsprintf(state->in, format, va);
325 va_end(va);
326 # endif
327 #else
328 # ifdef HAS_vsnprintf_void
329 (void)vsnprintf(state->in, size, format, va);
330 va_end(va);
331 len = strlen(state->in);
332 # else
333 len = vsnprintf((char *)(state->in), size, format, va);
334 va_end(va);
335 # endif
336 #endif
337
338 /* check that printf() results fit in buffer */
339 if (len <= 0 || len >= (int)size || state->in[size - 1] != 0)
340 return 0;
341
342 /* update buffer and position, defer compression until needed */
343 strm->avail_in = (unsigned)len;
344 strm->next_in = state->in;
345 state->pos += len;
346 return len;
347 }
348
349 #else /* !STDC */
350
351 /* -- see zlib.h -- */
352 int ZEXPORTVA gzprintf (file, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
353 a11, a12, a13, a14, a15, a16, a17, a18, a19, a20)
354 gzFile file;
355 const char *format;
356 int a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
357 a11, a12, a13, a14, a15, a16, a17, a18, a19, a20;
358 {
359 int size, len;
360 gz_statep state;
361 z_streamp strm;
362
363 /* get internal structure */
364 if (file == NULL)
365 return -1;
366 state = (gz_statep)file;
367 strm = &(state->strm);
368
369 /* check that we're writing and that there's no error */
370 if (state->mode != GZ_WRITE || state->err != Z_OK)
371 return 0;
372
373 /* make sure we have some buffer space */
374 if (state->size == 0 && gz_init(state) == -1)
375 return 0;
376
377 /* check for seek request */
378 if (state->seek) {
379 state->seek = 0;
380 if (gz_zero(state, state->skip) == -1)
381 return 0;
382 }
383
384 /* consume whatever's left in the input buffer */
385 if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
386 return 0;
387
388 /* do the printf() into the input buffer, put length in len */
389 size = (int)(state->size);
390 state->in[size - 1] = 0;
391 #ifdef NO_snprintf
392 # ifdef HAS_sprintf_void
393 sprintf(state->in, format, a1, a2, a3, a4, a5, a6, a7, a8,
394 a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
395 for (len = 0; len < size; len++)
396 if (state->in[len] == 0) break;
397 # else
398 len = sprintf(state->in, format, a1, a2, a3, a4, a5, a6, a7, a8,
399 a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
400 # endif
401 #else
402 # ifdef HAS_snprintf_void
403 snprintf(state->in, size, format, a1, a2, a3, a4, a5, a6, a7, a8,
404 a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
405 len = strlen(state->in);
406 # else
407 len = snprintf(state->in, size, format, a1, a2, a3, a4, a5, a6, a7, a8,
408 a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
409 # endif
410 #endif
411
412 /* check that printf() results fit in buffer */
413 if (len <= 0 || len >= (int)size || state->in[size - 1] != 0)
414 return 0;
415
416 /* update buffer and position, defer compression until needed */
417 strm->avail_in = (unsigned)len;
418 strm->next_in = state->in;
419 state->pos += len;
420 return len;
421 }
422
423 #endif
424
425 /* -- see zlib.h -- */
426 int ZEXPORT gzflush(file, flush)
427 gzFile file;
428 int flush;
429 {
430 gz_statep state;
431
432 /* get internal structure */
433 if (file == NULL)
434 return -1;
435 state = (gz_statep)file;
436
437 /* check that we're writing and that there's no error */
438 if (state->mode != GZ_WRITE || state->err != Z_OK)
439 return Z_STREAM_ERROR;
440
441 /* check flush parameter */
442 if (flush < 0 || flush > Z_FINISH)
443 return Z_STREAM_ERROR;
444
445 /* check for seek request */
446 if (state->seek) {
447 state->seek = 0;
448 if (gz_zero(state, state->skip) == -1)
449 return -1;
450 }
451
452 /* compress remaining data with requested flush */
453 gz_comp(state, flush);
454 return state->err;
455 }
456
457 /* -- see zlib.h -- */
458 int ZEXPORT gzsetparams(file, level, strategy)
459 gzFile file;
460 int level;
461 int strategy;
462 {
463 gz_statep state;
464 z_streamp strm;
465
466 /* get internal structure */
467 if (file == NULL)
468 return Z_STREAM_ERROR;
469 state = (gz_statep)file;
470 strm = &(state->strm);
471
472 /* check that we're writing and that there's no error */
473 if (state->mode != GZ_WRITE || state->err != Z_OK)
474 return Z_STREAM_ERROR;
475
476 /* if no change is requested, then do nothing */
477 if (level == state->level && strategy == state->strategy)
478 return Z_OK;
479
480 /* check for seek request */
481 if (state->seek) {
482 state->seek = 0;
483 if (gz_zero(state, state->skip) == -1)
484 return -1;
485 }
486
487 /* change compression parameters for subsequent input */
488 if (state->size) {
489 /* flush previous input with previous parameters before changing */
490 if (strm->avail_in && gz_comp(state, Z_PARTIAL_FLUSH) == -1)
491 return state->err;
492 deflateParams(strm, level, strategy);
493 }
494 state->level = level;
495 state->strategy = strategy;
496 return Z_OK;
497 }
498
499 /* -- see zlib.h -- */
500 int ZEXPORT gzclose_w(file)
501 gzFile file;
502 {
503 int ret = 0;
504 gz_statep state;
505
506 /* get internal structure */
507 if (file == NULL)
508 return Z_STREAM_ERROR;
509 state = (gz_statep)file;
510
511 /* check that we're writing */
512 if (state->mode != GZ_WRITE)
513 return Z_STREAM_ERROR;
514
515 /* check for seek request */
516 if (state->seek) {
517 state->seek = 0;
518 ret += gz_zero(state, state->skip);
519 }
520
521 /* flush, free memory, and close file */
522 ret += gz_comp(state, Z_FINISH);
523 (void)deflateEnd(&(state->strm));
524 free(state->out);
525 free(state->in);
526 gz_error(state, Z_OK, NULL);
527 free(state->path);
528 ret += close(state->fd);
529 free(state);
530 return ret ? Z_ERRNO : Z_OK;
531 }

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