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
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));
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)
19 z_streamp strm = &(state->strm);
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");
28 /* only need output buffer and deflate state if compressing */
30 /* allocate output buffer */
31 state->out = malloc(state->want);
32 if (state->out == NULL) {
34 gz_error(state, Z_MEM_ERROR, "out of memory");
38 /* allocate deflate memory, set up for gzip compression */
39 strm->zalloc = Z_NULL;
41 strm->opaque = Z_NULL;
42 ret = deflateInit2(strm, state->level, Z_DEFLATED,
43 MAX_WBITS + 16, DEF_MEM_LEVEL, state->strategy);
47 gz_error(state, Z_MEM_ERROR, "out of memory");
52 /* mark state as initialized */
53 state->size = state->want;
55 /* initialize write buffer if compressing */
57 strm->avail_out = state->size;
58 strm->next_out = state->out;
59 state->x.next = strm->next_out;
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
70 local int gz_comp(state, flush)
76 z_streamp strm = &(state->strm);
78 /* allocate memory if this is the first time through */
79 if (state->size == 0 && gz_init(state) == -1)
82 /* write directly if requested */
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());
93 /* run deflate() on provided input until it produces no more output */
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());
106 if (strm->avail_out == 0) {
107 strm->avail_out = state->size;
108 strm->next_out = state->out;
110 state->x.next = strm->next_out;
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");
121 have -= strm->avail_out;
124 /* if that completed a deflate stream, allow another to start */
125 if (flush == Z_FINISH)
128 /* all done, no errors */
132 /* Compress len zeros to output. Return -1 on error, 0 on success. */
133 local int gz_zero(state, len)
139 z_streamp strm = &(state->strm);
141 /* consume whatever's left in the input buffer */
142 if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
145 /* compress len zeros (len guaranteed > 0) */
148 n = GT_OFF(state->size) || (z_off64_t)state->size > len ?
149 (unsigned)len : state->size;
151 memset(state->in, 0, n);
155 strm->next_in = state->in;
157 if (gz_comp(state, Z_NO_FLUSH) == -1)
164 /* -- see zlib.h -- */
165 int ZEXPORT gzwrite(file, buf, len)
174 /* get internal structure */
177 state = (gz_statep)file;
178 strm = &(state->strm);
180 /* check that we're writing and that there's no error */
181 if (state->mode != GZ_WRITE || state->err != Z_OK)
184 /* since an int is returned, make sure len fits in one, otherwise return
185 with an error (this avoids the flaw in the interface) */
187 gz_error(state, Z_DATA_ERROR, "requested length does not fit in int");
191 /* if len is zero, avoid unnecessary operations */
195 /* allocate memory if this is the first time through */
196 if (state->size == 0 && gz_init(state) == -1)
199 /* check for seek request */
202 if (gz_zero(state, state->skip) == -1)
206 /* for small len, copy to input buffer, otherwise compress directly */
207 if (len < state->size) {
208 /* copy to input buffer, compress when full */
212 if (strm->avail_in == 0)
213 strm->next_in = state->in;
214 have = strm->next_in + strm->avail_in - state->in;
215 copy = state->size - have;
218 memcpy(state->in + have, buf, copy);
219 strm->avail_in += copy;
220 state->x.pos += copy;
221 buf = (const char *)buf + copy;
223 if (len && gz_comp(state, Z_NO_FLUSH) == -1)
228 /* consume whatever's left in the input buffer */
229 if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
232 /* directly compress user buffer to file */
233 strm->avail_in = len;
234 strm->next_in = (z_const Bytef *)buf;
236 if (gz_comp(state, Z_NO_FLUSH) == -1)
240 /* input was all buffered or compressed (put will fit in int) */
244 /* -- see zlib.h -- */
245 int ZEXPORT gzputc(file, c)
250 unsigned char buf[1];
254 /* get internal structure */
257 state = (gz_statep)file;
258 strm = &(state->strm);
260 /* check that we're writing and that there's no error */
261 if (state->mode != GZ_WRITE || state->err != Z_OK)
264 /* check for seek request */
267 if (gz_zero(state, state->skip) == -1)
271 /* try writing to input buffer for speed (state->size == 0 if buffer not
274 if (strm->avail_in == 0)
275 strm->next_in = state->in;
276 have = strm->next_in + strm->avail_in - state->in;
277 if (have < state->size) {
285 /* no room in buffer or not initialized, use gz_write() */
287 if (gzwrite(file, buf, 1) != 1)
292 /* -- see zlib.h -- */
293 int ZEXPORT gzputs(file, str)
301 len = (unsigned)strlen(str);
302 ret = gzwrite(file, str, len);
303 return ret == 0 && len != 0 ? -1 : ret;
306 #if defined(STDC) || defined(Z_HAVE_STDARG_H)
309 /* -- see zlib.h -- */
310 int ZEXPORTVA gzprintf (gzFile file, const char *format, ...)
317 /* get internal structure */
320 state = (gz_statep)file;
321 strm = &(state->strm);
323 /* check that we're writing and that there's no error */
324 if (state->mode != GZ_WRITE || state->err != Z_OK)
327 /* make sure we have some buffer space */
328 if (state->size == 0 && gz_init(state) == -1)
331 /* check for seek request */
334 if (gz_zero(state, state->skip) == -1)
338 /* consume whatever's left in the input buffer */
339 if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
342 /* do the printf() into the input buffer, put length in len */
343 size = (int)(state->size);
344 state->in[size - 1] = 0;
345 va_start(va, format);
347 # ifdef HAS_vsprintf_void
348 (void)vsprintf((char *)(state->in), format, va);
350 for (len = 0; len < size; len++)
351 if (state->in[len] == 0) break;
353 len = vsprintf((char *)(state->in), format, va);
357 # ifdef HAS_vsnprintf_void
358 (void)vsnprintf((char *)(state->in), size, format, va);
360 len = strlen((char *)(state->in));
362 len = vsnprintf((char *)(state->in), size, format, va);
367 /* check that printf() results fit in buffer */
368 if (len <= 0 || len >= (int)size || state->in[size - 1] != 0)
371 /* update buffer and position, defer compression until needed */
372 strm->avail_in = (unsigned)len;
373 strm->next_in = state->in;
378 #else /* !STDC && !Z_HAVE_STDARG_H */
380 /* -- see zlib.h -- */
381 int ZEXPORTVA gzprintf (file, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
382 a11, a12, a13, a14, a15, a16, a17, a18, a19, a20)
385 int a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
386 a11, a12, a13, a14, a15, a16, a17, a18, a19, a20;
392 /* get internal structure */
395 state = (gz_statep)file;
396 strm = &(state->strm);
398 /* check that can really pass pointer in ints */
399 if (sizeof(int) != sizeof(void *))
402 /* check that we're writing and that there's no error */
403 if (state->mode != GZ_WRITE || state->err != Z_OK)
406 /* make sure we have some buffer space */
407 if (state->size == 0 && gz_init(state) == -1)
410 /* check for seek request */
413 if (gz_zero(state, state->skip) == -1)
417 /* consume whatever's left in the input buffer */
418 if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
421 /* do the printf() into the input buffer, put length in len */
422 size = (int)(state->size);
423 state->in[size - 1] = 0;
425 # ifdef HAS_sprintf_void
426 sprintf((char *)(state->in), format, a1, a2, a3, a4, a5, a6, a7, a8,
427 a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
428 for (len = 0; len < size; len++)
429 if (state->in[len] == 0) break;
431 len = sprintf((char *)(state->in), format, a1, a2, a3, a4, a5, a6, a7, a8,
432 a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
435 # ifdef HAS_snprintf_void
436 snprintf((char *)(state->in), size, format, a1, a2, a3, a4, a5, a6, a7, a8,
437 a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
438 len = strlen((char *)(state->in));
440 len = snprintf((char *)(state->in), size, format, a1, a2, a3, a4, a5, a6,
441 a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18,
446 /* check that printf() results fit in buffer */
447 if (len <= 0 || len >= (int)size || state->in[size - 1] != 0)
450 /* update buffer and position, defer compression until needed */
451 strm->avail_in = (unsigned)len;
452 strm->next_in = state->in;
459 /* -- see zlib.h -- */
460 int ZEXPORT gzflush(file, flush)
466 /* get internal structure */
469 state = (gz_statep)file;
471 /* check that we're writing and that there's no error */
472 if (state->mode != GZ_WRITE || state->err != Z_OK)
473 return Z_STREAM_ERROR;
475 /* check flush parameter */
476 if (flush < 0 || flush > Z_FINISH)
477 return Z_STREAM_ERROR;
479 /* check for seek request */
482 if (gz_zero(state, state->skip) == -1)
486 /* compress remaining data with requested flush */
487 gz_comp(state, flush);
491 /* -- see zlib.h -- */
492 int ZEXPORT gzsetparams(file, level, strategy)
500 /* get internal structure */
502 return Z_STREAM_ERROR;
503 state = (gz_statep)file;
504 strm = &(state->strm);
506 /* check that we're writing and that there's no error */
507 if (state->mode != GZ_WRITE || state->err != Z_OK)
508 return Z_STREAM_ERROR;
510 /* if no change is requested, then do nothing */
511 if (level == state->level && strategy == state->strategy)
514 /* check for seek request */
517 if (gz_zero(state, state->skip) == -1)
521 /* change compression parameters for subsequent input */
523 /* flush previous input with previous parameters before changing */
524 if (strm->avail_in && gz_comp(state, Z_PARTIAL_FLUSH) == -1)
526 deflateParams(strm, level, strategy);
528 state->level = level;
529 state->strategy = strategy;
533 /* -- see zlib.h -- */
534 int ZEXPORT gzclose_w(file)
540 /* get internal structure */
542 return Z_STREAM_ERROR;
543 state = (gz_statep)file;
545 /* check that we're writing */
546 if (state->mode != GZ_WRITE)
547 return Z_STREAM_ERROR;
549 /* check for seek request */
552 if (gz_zero(state, state->skip) == -1)
556 /* flush, free memory, and close file */
557 if (gz_comp(state, Z_FINISH) == -1)
560 if (!state->direct) {
561 (void)deflateEnd(&(state->strm));
566 gz_error(state, Z_OK, NULL);
568 if (close(state->fd) == -1)