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
273 if (strm->avail_in == 0)
274 strm->next_in = state->in;
275 have = strm->next_in + strm->avail_in - state->in;
276 if (have < state->size) {
283 /* no room in buffer or not initialized, use gz_write() */
285 if (gzwrite(file, buf, 1) != 1)
290 /* -- see zlib.h -- */
291 int ZEXPORT gzputs(file, str)
299 len = (unsigned)strlen(str);
300 ret = gzwrite(file, str, len);
301 return ret == 0 && len != 0 ? -1 : ret;
304 #if defined(STDC) || defined(Z_HAVE_STDARG_H)
307 /* -- see zlib.h -- */
308 int ZEXPORTVA gzprintf (gzFile file, const char *format, ...)
315 /* get internal structure */
318 state = (gz_statep)file;
319 strm = &(state->strm);
321 /* check that we're writing and that there's no error */
322 if (state->mode != GZ_WRITE || state->err != Z_OK)
325 /* make sure we have some buffer space */
326 if (state->size == 0 && gz_init(state) == -1)
329 /* check for seek request */
332 if (gz_zero(state, state->skip) == -1)
336 /* consume whatever's left in the input buffer */
337 if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
340 /* do the printf() into the input buffer, put length in len */
341 size = (int)(state->size);
342 state->in[size - 1] = 0;
343 va_start(va, format);
345 # ifdef HAS_vsprintf_void
346 (void)vsprintf((char *)(state->in), format, va);
348 for (len = 0; len < size; len++)
349 if (state->in[len] == 0) break;
351 len = vsprintf((char *)(state->in), format, va);
355 # ifdef HAS_vsnprintf_void
356 (void)vsnprintf((char *)(state->in), size, format, va);
358 len = strlen((char *)(state->in));
360 len = vsnprintf((char *)(state->in), size, format, va);
365 /* check that printf() results fit in buffer */
366 if (len <= 0 || len >= (int)size || state->in[size - 1] != 0)
369 /* update buffer and position, defer compression until needed */
370 strm->avail_in = (unsigned)len;
371 strm->next_in = state->in;
376 #else /* !STDC && !Z_HAVE_STDARG_H */
378 /* -- see zlib.h -- */
379 int ZEXPORTVA gzprintf (file, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
380 a11, a12, a13, a14, a15, a16, a17, a18, a19, a20)
383 int a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
384 a11, a12, a13, a14, a15, a16, a17, a18, a19, a20;
390 /* get internal structure */
393 state = (gz_statep)file;
394 strm = &(state->strm);
396 /* check that can really pass pointer in ints */
397 if (sizeof(int) != sizeof(void *))
400 /* check that we're writing and that there's no error */
401 if (state->mode != GZ_WRITE || state->err != Z_OK)
404 /* make sure we have some buffer space */
405 if (state->size == 0 && gz_init(state) == -1)
408 /* check for seek request */
411 if (gz_zero(state, state->skip) == -1)
415 /* consume whatever's left in the input buffer */
416 if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
419 /* do the printf() into the input buffer, put length in len */
420 size = (int)(state->size);
421 state->in[size - 1] = 0;
423 # ifdef HAS_sprintf_void
424 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 for (len = 0; len < size; len++)
427 if (state->in[len] == 0) break;
429 len = sprintf((char *)(state->in), format, a1, a2, a3, a4, a5, a6, a7, a8,
430 a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
433 # ifdef HAS_snprintf_void
434 snprintf((char *)(state->in), size, format, a1, a2, a3, a4, a5, a6, a7, a8,
435 a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
436 len = strlen((char *)(state->in));
438 len = snprintf((char *)(state->in), size, format, a1, a2, a3, a4, a5, a6,
439 a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18,
444 /* check that printf() results fit in buffer */
445 if (len <= 0 || len >= (int)size || state->in[size - 1] != 0)
448 /* update buffer and position, defer compression until needed */
449 strm->avail_in = (unsigned)len;
450 strm->next_in = state->in;
457 /* -- see zlib.h -- */
458 int ZEXPORT gzflush(file, flush)
464 /* get internal structure */
467 state = (gz_statep)file;
469 /* check that we're writing and that there's no error */
470 if (state->mode != GZ_WRITE || state->err != Z_OK)
471 return Z_STREAM_ERROR;
473 /* check flush parameter */
474 if (flush < 0 || flush > Z_FINISH)
475 return Z_STREAM_ERROR;
477 /* check for seek request */
480 if (gz_zero(state, state->skip) == -1)
484 /* compress remaining data with requested flush */
485 gz_comp(state, flush);
489 /* -- see zlib.h -- */
490 int ZEXPORT gzsetparams(file, level, strategy)
498 /* get internal structure */
500 return Z_STREAM_ERROR;
501 state = (gz_statep)file;
502 strm = &(state->strm);
504 /* check that we're writing and that there's no error */
505 if (state->mode != GZ_WRITE || state->err != Z_OK)
506 return Z_STREAM_ERROR;
508 /* if no change is requested, then do nothing */
509 if (level == state->level && strategy == state->strategy)
512 /* check for seek request */
515 if (gz_zero(state, state->skip) == -1)
519 /* change compression parameters for subsequent input */
521 /* flush previous input with previous parameters before changing */
522 if (strm->avail_in && gz_comp(state, Z_PARTIAL_FLUSH) == -1)
524 deflateParams(strm, level, strategy);
526 state->level = level;
527 state->strategy = strategy;
531 /* -- see zlib.h -- */
532 int ZEXPORT gzclose_w(file)
538 /* get internal structure */
540 return Z_STREAM_ERROR;
541 state = (gz_statep)file;
543 /* check that we're writing */
544 if (state->mode != GZ_WRITE)
545 return Z_STREAM_ERROR;
547 /* check for seek request */
550 if (gz_zero(state, state->skip) == -1)
554 /* flush, free memory, and close file */
556 if (gz_comp(state, Z_FINISH) == -1)
558 if (!state->direct) {
559 (void)deflateEnd(&(state->strm));
564 gz_error(state, Z_OK, NULL);
566 if (close(state->fd) == -1)