648db22b |
1 | /* gzwrite.c contains minimal changes required to be compiled with zlibWrapper: |
2 | * - gz_statep was converted to union to work with -Wstrict-aliasing=1 */ |
3 | |
4 | /* gzwrite.c -- zlib functions for writing gzip files |
5 | * Copyright (C) 2004-2017 Mark Adler |
6 | * For conditions of distribution and use, see https://www.zlib.net/zlib_license.html |
b24e7fce |
7 | */ |
8 | |
648db22b |
9 | #include <assert.h> |
10 | |
b24e7fce |
11 | #include "gzguts.h" |
12 | |
13 | /* Local functions */ |
648db22b |
14 | local int gz_init _Z_OF((gz_statep)); |
15 | local int gz_comp _Z_OF((gz_statep, int)); |
16 | local int gz_zero _Z_OF((gz_statep, z_off64_t)); |
17 | local z_size_t gz_write _Z_OF((gz_statep, voidpc, z_size_t)); |
b24e7fce |
18 | |
19 | /* Initialize state for writing a gzip file. Mark initialization by setting |
648db22b |
20 | state.state->size to non-zero. Return -1 on a memory allocation failure, or 0 on |
b24e7fce |
21 | success. */ |
f535537f |
22 | local int gz_init(gz_statep state) { |
b24e7fce |
23 | int ret; |
648db22b |
24 | z_streamp strm = &(state.state->strm); |
b24e7fce |
25 | |
26 | /* allocate input buffer (double size for gzprintf) */ |
648db22b |
27 | state.state->in = (unsigned char*)malloc(state.state->want << 1); |
28 | if (state.state->in == NULL) { |
b24e7fce |
29 | gz_error(state, Z_MEM_ERROR, "out of memory"); |
30 | return -1; |
31 | } |
32 | |
33 | /* only need output buffer and deflate state if compressing */ |
648db22b |
34 | if (!state.state->direct) { |
b24e7fce |
35 | /* allocate output buffer */ |
648db22b |
36 | state.state->out = (unsigned char*)malloc(state.state->want); |
37 | if (state.state->out == NULL) { |
38 | free(state.state->in); |
b24e7fce |
39 | gz_error(state, Z_MEM_ERROR, "out of memory"); |
40 | return -1; |
41 | } |
42 | |
43 | /* allocate deflate memory, set up for gzip compression */ |
44 | strm->zalloc = Z_NULL; |
45 | strm->zfree = Z_NULL; |
46 | strm->opaque = Z_NULL; |
648db22b |
47 | ret = deflateInit2(strm, state.state->level, Z_DEFLATED, |
48 | MAX_WBITS + 16, DEF_MEM_LEVEL, state.state->strategy); |
b24e7fce |
49 | if (ret != Z_OK) { |
648db22b |
50 | free(state.state->out); |
51 | free(state.state->in); |
b24e7fce |
52 | gz_error(state, Z_MEM_ERROR, "out of memory"); |
53 | return -1; |
54 | } |
55 | strm->next_in = NULL; |
56 | } |
57 | |
58 | /* mark state as initialized */ |
648db22b |
59 | state.state->size = state.state->want; |
b24e7fce |
60 | |
61 | /* initialize write buffer if compressing */ |
648db22b |
62 | if (!state.state->direct) { |
63 | strm->avail_out = state.state->size; |
64 | strm->next_out = state.state->out; |
65 | state.state->x.next = strm->next_out; |
b24e7fce |
66 | } |
67 | return 0; |
68 | } |
69 | |
70 | /* Compress whatever is at avail_in and next_in and write to the output file. |
71 | Return -1 if there is an error writing to the output file or if gz_init() |
72 | fails to allocate memory, otherwise 0. flush is assumed to be a valid |
73 | deflate() flush value. If flush is Z_FINISH, then the deflate() state is |
74 | reset to start a new gzip stream. If gz->direct is true, then simply write |
75 | to the output file without compressing, and ignore flush. */ |
f535537f |
76 | local int gz_comp(gz_statep state, int flush) { |
b24e7fce |
77 | int ret, writ; |
78 | unsigned have, put, max = ((unsigned)-1 >> 2) + 1; |
648db22b |
79 | z_streamp strm = &(state.state->strm); |
b24e7fce |
80 | |
81 | /* allocate memory if this is the first time through */ |
648db22b |
82 | if (state.state->size == 0 && gz_init(state) == -1) |
b24e7fce |
83 | return -1; |
84 | |
85 | /* write directly if requested */ |
648db22b |
86 | if (state.state->direct) { |
b24e7fce |
87 | while (strm->avail_in) { |
88 | put = strm->avail_in > max ? max : strm->avail_in; |
648db22b |
89 | writ = (int)write(state.state->fd, strm->next_in, put); |
b24e7fce |
90 | if (writ < 0) { |
91 | gz_error(state, Z_ERRNO, zstrerror()); |
92 | return -1; |
93 | } |
94 | strm->avail_in -= (unsigned)writ; |
95 | strm->next_in += writ; |
96 | } |
97 | return 0; |
98 | } |
99 | |
100 | /* run deflate() on provided input until it produces no more output */ |
101 | ret = Z_OK; |
102 | do { |
103 | /* write out current buffer contents if full, or if flushing, but if |
104 | doing Z_FINISH then don't write until we get to Z_STREAM_END */ |
105 | if (strm->avail_out == 0 || (flush != Z_NO_FLUSH && |
106 | (flush != Z_FINISH || ret == Z_STREAM_END))) { |
648db22b |
107 | while (strm->next_out > state.state->x.next) { |
108 | put = strm->next_out - state.state->x.next > (int)max ? max : |
109 | (unsigned)(strm->next_out - state.state->x.next); |
110 | writ = (int)write(state.state->fd, state.state->x.next, put); |
b24e7fce |
111 | if (writ < 0) { |
112 | gz_error(state, Z_ERRNO, zstrerror()); |
113 | return -1; |
114 | } |
648db22b |
115 | state.state->x.next += writ; |
b24e7fce |
116 | } |
117 | if (strm->avail_out == 0) { |
648db22b |
118 | strm->avail_out = state.state->size; |
119 | strm->next_out = state.state->out; |
120 | state.state->x.next = state.state->out; |
b24e7fce |
121 | } |
122 | } |
123 | |
124 | /* compress */ |
125 | have = strm->avail_out; |
126 | ret = deflate(strm, flush); |
127 | if (ret == Z_STREAM_ERROR) { |
128 | gz_error(state, Z_STREAM_ERROR, |
129 | "internal error: deflate stream corrupt"); |
130 | return -1; |
131 | } |
132 | have -= strm->avail_out; |
133 | } while (have); |
134 | |
135 | /* if that completed a deflate stream, allow another to start */ |
136 | if (flush == Z_FINISH) |
648db22b |
137 | deflateReset(strm); |
b24e7fce |
138 | |
139 | /* all done, no errors */ |
140 | return 0; |
141 | } |
142 | |
143 | /* Compress len zeros to output. Return -1 on a write error or memory |
144 | allocation failure by gz_comp(), or 0 on success. */ |
f535537f |
145 | local int gz_zero(gz_statep state, z_off64_t len) { |
b24e7fce |
146 | int first; |
147 | unsigned n; |
648db22b |
148 | z_streamp strm = &(state.state->strm); |
b24e7fce |
149 | |
150 | /* consume whatever's left in the input buffer */ |
151 | if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1) |
152 | return -1; |
153 | |
154 | /* compress len zeros (len guaranteed > 0) */ |
155 | first = 1; |
156 | while (len) { |
648db22b |
157 | n = GT_OFF(state.state->size) || (z_off64_t)state.state->size > len ? |
158 | (unsigned)len : state.state->size; |
b24e7fce |
159 | if (first) { |
648db22b |
160 | memset(state.state->in, 0, n); |
b24e7fce |
161 | first = 0; |
162 | } |
163 | strm->avail_in = n; |
648db22b |
164 | strm->next_in = state.state->in; |
165 | state.state->x.pos += n; |
b24e7fce |
166 | if (gz_comp(state, Z_NO_FLUSH) == -1) |
167 | return -1; |
168 | len -= n; |
169 | } |
170 | return 0; |
171 | } |
172 | |
173 | /* Write len bytes from buf to file. Return the number of bytes written. If |
174 | the returned value is less than len, then there was an error. */ |
f535537f |
175 | local z_size_t gz_write(gz_statep state, voidpc buf, z_size_t len) { |
b24e7fce |
176 | z_size_t put = len; |
177 | |
178 | /* if len is zero, avoid unnecessary operations */ |
179 | if (len == 0) |
180 | return 0; |
181 | |
182 | /* allocate memory if this is the first time through */ |
648db22b |
183 | if (state.state->size == 0 && gz_init(state) == -1) |
b24e7fce |
184 | return 0; |
185 | |
186 | /* check for seek request */ |
648db22b |
187 | if (state.state->seek) { |
188 | state.state->seek = 0; |
189 | if (gz_zero(state, state.state->skip) == -1) |
b24e7fce |
190 | return 0; |
191 | } |
192 | |
193 | /* for small len, copy to input buffer, otherwise compress directly */ |
648db22b |
194 | if (len < state.state->size) { |
b24e7fce |
195 | /* copy to input buffer, compress when full */ |
196 | do { |
648db22b |
197 | z_size_t have, copy; |
b24e7fce |
198 | |
648db22b |
199 | if (state.state->strm.avail_in == 0) |
200 | state.state->strm.next_in = state.state->in; |
201 | have = (unsigned)((state.state->strm.next_in + state.state->strm.avail_in) - |
202 | state.state->in); |
203 | copy = state.state->size - have; |
b24e7fce |
204 | if (copy > len) |
648db22b |
205 | copy = len; |
206 | memcpy(state.state->in + have, buf, copy); |
207 | state.state->strm.avail_in += copy; |
208 | state.state->x.pos += copy; |
b24e7fce |
209 | buf = (const char *)buf + copy; |
210 | len -= copy; |
211 | if (len && gz_comp(state, Z_NO_FLUSH) == -1) |
212 | return 0; |
213 | } while (len); |
214 | } |
215 | else { |
216 | /* consume whatever's left in the input buffer */ |
648db22b |
217 | if (state.state->strm.avail_in && gz_comp(state, Z_NO_FLUSH) == -1) |
b24e7fce |
218 | return 0; |
219 | |
220 | /* directly compress user buffer to file */ |
648db22b |
221 | state.state->strm.next_in = (z_const Bytef *)buf; |
b24e7fce |
222 | do { |
648db22b |
223 | z_size_t n = (unsigned)-1; |
b24e7fce |
224 | if (n > len) |
648db22b |
225 | n = len; |
226 | state.state->strm.avail_in = (z_uInt)n; |
227 | state.state->x.pos += n; |
b24e7fce |
228 | if (gz_comp(state, Z_NO_FLUSH) == -1) |
229 | return 0; |
230 | len -= n; |
231 | } while (len); |
232 | } |
233 | |
234 | /* input was all buffered or compressed */ |
235 | return put; |
236 | } |
237 | |
238 | /* -- see zlib.h -- */ |
f535537f |
239 | int ZEXPORT gzwrite(gzFile file, voidpc buf, unsigned len) { |
b24e7fce |
240 | gz_statep state; |
241 | |
242 | /* get internal structure */ |
243 | if (file == NULL) |
244 | return 0; |
648db22b |
245 | state.file = file; |
b24e7fce |
246 | |
247 | /* check that we're writing and that there's no error */ |
648db22b |
248 | if (state.state->mode != GZ_WRITE || state.state->err != Z_OK) |
b24e7fce |
249 | return 0; |
250 | |
251 | /* since an int is returned, make sure len fits in one, otherwise return |
252 | with an error (this avoids a flaw in the interface) */ |
253 | if ((int)len < 0) { |
254 | gz_error(state, Z_DATA_ERROR, "requested length does not fit in int"); |
255 | return 0; |
256 | } |
257 | |
258 | /* write len bytes from buf (the return value will fit in an int) */ |
259 | return (int)gz_write(state, buf, len); |
260 | } |
261 | |
262 | /* -- see zlib.h -- */ |
f535537f |
263 | z_size_t ZEXPORT gzfwrite(voidpc buf, z_size_t size, z_size_t nitems, |
264 | gzFile file) { |
b24e7fce |
265 | z_size_t len; |
266 | gz_statep state; |
267 | |
268 | /* get internal structure */ |
648db22b |
269 | assert(size != 0); |
b24e7fce |
270 | if (file == NULL) |
271 | return 0; |
648db22b |
272 | state.file = file; |
b24e7fce |
273 | |
274 | /* check that we're writing and that there's no error */ |
648db22b |
275 | if (state.state->mode != GZ_WRITE || state.state->err != Z_OK) |
b24e7fce |
276 | return 0; |
277 | |
278 | /* compute bytes to read -- error on overflow */ |
279 | len = nitems * size; |
648db22b |
280 | if (size && (len / size != nitems)) { |
b24e7fce |
281 | gz_error(state, Z_STREAM_ERROR, "request does not fit in a size_t"); |
282 | return 0; |
283 | } |
284 | |
285 | /* write len bytes to buf, return the number of full items written */ |
286 | return len ? gz_write(state, buf, len) / size : 0; |
287 | } |
288 | |
289 | /* -- see zlib.h -- */ |
f535537f |
290 | int ZEXPORT gzputc(gzFile file, int c) { |
b24e7fce |
291 | unsigned have; |
292 | unsigned char buf[1]; |
293 | gz_statep state; |
294 | z_streamp strm; |
295 | |
296 | /* get internal structure */ |
297 | if (file == NULL) |
298 | return -1; |
648db22b |
299 | state.file = file; |
300 | strm = &(state.state->strm); |
b24e7fce |
301 | |
302 | /* check that we're writing and that there's no error */ |
648db22b |
303 | if (state.state->mode != GZ_WRITE || state.state->err != Z_OK) |
b24e7fce |
304 | return -1; |
305 | |
306 | /* check for seek request */ |
648db22b |
307 | if (state.state->seek) { |
308 | state.state->seek = 0; |
309 | if (gz_zero(state, state.state->skip) == -1) |
b24e7fce |
310 | return -1; |
311 | } |
312 | |
648db22b |
313 | /* try writing to input buffer for speed (state.state->size == 0 if buffer not |
b24e7fce |
314 | initialized) */ |
648db22b |
315 | if (state.state->size) { |
b24e7fce |
316 | if (strm->avail_in == 0) |
648db22b |
317 | strm->next_in = state.state->in; |
318 | have = (unsigned)((strm->next_in + strm->avail_in) - state.state->in); |
319 | if (have < state.state->size) { |
320 | state.state->in[have] = (unsigned char)c; |
b24e7fce |
321 | strm->avail_in++; |
648db22b |
322 | state.state->x.pos++; |
b24e7fce |
323 | return c & 0xff; |
324 | } |
325 | } |
326 | |
327 | /* no room in buffer or not initialized, use gz_write() */ |
328 | buf[0] = (unsigned char)c; |
329 | if (gz_write(state, buf, 1) != 1) |
330 | return -1; |
331 | return c & 0xff; |
332 | } |
333 | |
334 | /* -- see zlib.h -- */ |
f535537f |
335 | int ZEXPORT gzputs(gzFile file, const char *str) { |
648db22b |
336 | int ret; |
337 | z_size_t len; |
b24e7fce |
338 | gz_statep state; |
339 | |
340 | /* get internal structure */ |
341 | if (file == NULL) |
342 | return -1; |
648db22b |
343 | state.file = file; |
b24e7fce |
344 | |
345 | /* check that we're writing and that there's no error */ |
648db22b |
346 | if (state.state->mode != GZ_WRITE || state.state->err != Z_OK) |
b24e7fce |
347 | return -1; |
348 | |
349 | /* write string */ |
648db22b |
350 | len = strlen(str); |
351 | ret = (int)gz_write(state, str, len); |
352 | return ret == 0 && len != 0 ? -1 : ret; |
b24e7fce |
353 | } |
354 | |
355 | #if defined(STDC) || defined(Z_HAVE_STDARG_H) |
356 | #include <stdarg.h> |
357 | |
358 | /* -- see zlib.h -- */ |
f535537f |
359 | int ZEXPORTVA gzvprintf(gzFile file, const char *format, va_list va) { |
b24e7fce |
360 | int len; |
361 | unsigned left; |
362 | char *next; |
363 | gz_statep state; |
364 | z_streamp strm; |
365 | |
366 | /* get internal structure */ |
367 | if (file == NULL) |
368 | return Z_STREAM_ERROR; |
648db22b |
369 | state.file = file; |
370 | strm = &(state.state->strm); |
b24e7fce |
371 | |
372 | /* check that we're writing and that there's no error */ |
648db22b |
373 | if (state.state->mode != GZ_WRITE || state.state->err != Z_OK) |
b24e7fce |
374 | return Z_STREAM_ERROR; |
375 | |
376 | /* make sure we have some buffer space */ |
648db22b |
377 | if (state.state->size == 0 && gz_init(state) == -1) |
378 | return state.state->err; |
b24e7fce |
379 | |
380 | /* check for seek request */ |
648db22b |
381 | if (state.state->seek) { |
382 | state.state->seek = 0; |
383 | if (gz_zero(state, state.state->skip) == -1) |
384 | return state.state->err; |
b24e7fce |
385 | } |
386 | |
387 | /* do the printf() into the input buffer, put length in len -- the input |
388 | buffer is double-sized just for this function, so there is guaranteed to |
648db22b |
389 | be state.state->size bytes available after the current contents */ |
b24e7fce |
390 | if (strm->avail_in == 0) |
648db22b |
391 | strm->next_in = state.state->in; |
392 | next = (char *)(state.state->in + (strm->next_in - state.state->in) + strm->avail_in); |
393 | next[state.state->size - 1] = 0; |
b24e7fce |
394 | #ifdef NO_vsnprintf |
395 | # ifdef HAS_vsprintf_void |
396 | (void)vsprintf(next, format, va); |
648db22b |
397 | for (len = 0; len < state.state->size; len++) |
b24e7fce |
398 | if (next[len] == 0) break; |
399 | # else |
400 | len = vsprintf(next, format, va); |
401 | # endif |
402 | #else |
403 | # ifdef HAS_vsnprintf_void |
648db22b |
404 | (void)vsnprintf(next, state.state->size, format, va); |
b24e7fce |
405 | len = strlen(next); |
406 | # else |
648db22b |
407 | len = vsnprintf(next, state.state->size, format, va); |
b24e7fce |
408 | # endif |
409 | #endif |
410 | |
411 | /* check that printf() results fit in buffer */ |
648db22b |
412 | if (len == 0 || (unsigned)len >= state.state->size || next[state.state->size - 1] != 0) |
b24e7fce |
413 | return 0; |
414 | |
415 | /* update buffer and position, compress first half if past that */ |
416 | strm->avail_in += (unsigned)len; |
648db22b |
417 | state.state->x.pos += len; |
418 | if (strm->avail_in >= state.state->size) { |
419 | left = strm->avail_in - state.state->size; |
420 | strm->avail_in = state.state->size; |
b24e7fce |
421 | if (gz_comp(state, Z_NO_FLUSH) == -1) |
648db22b |
422 | return state.state->err; |
423 | memcpy(state.state->in, state.state->in + state.state->size, left); |
424 | strm->next_in = state.state->in; |
b24e7fce |
425 | strm->avail_in = left; |
426 | } |
427 | return len; |
428 | } |
429 | |
f535537f |
430 | int ZEXPORTVA gzprintf(gzFile file, const char *format, ...) { |
b24e7fce |
431 | va_list va; |
432 | int ret; |
433 | |
434 | va_start(va, format); |
435 | ret = gzvprintf(file, format, va); |
436 | va_end(va); |
437 | return ret; |
438 | } |
439 | |
440 | #else /* !STDC && !Z_HAVE_STDARG_H */ |
441 | |
442 | /* -- see zlib.h -- */ |
f535537f |
443 | int ZEXPORTVA gzprintf(gzFile file, const char *format, int a1, int a2, int a3, |
444 | int a4, int a5, int a6, int a7, int a8, int a9, int a10, |
445 | int a11, int a12, int a13, int a14, int a15, int a16, |
446 | int a17, int a18, int a19, int a20) { |
b24e7fce |
447 | unsigned len, left; |
448 | char *next; |
449 | gz_statep state; |
450 | z_streamp strm; |
451 | |
452 | /* get internal structure */ |
453 | if (file == NULL) |
454 | return Z_STREAM_ERROR; |
455 | state = (gz_statep)file; |
648db22b |
456 | strm = &(state.state->strm); |
b24e7fce |
457 | |
458 | /* check that can really pass pointer in ints */ |
459 | if (sizeof(int) != sizeof(void *)) |
460 | return Z_STREAM_ERROR; |
461 | |
462 | /* check that we're writing and that there's no error */ |
648db22b |
463 | if (state.state->mode != GZ_WRITE || state.state->err != Z_OK) |
b24e7fce |
464 | return Z_STREAM_ERROR; |
465 | |
466 | /* make sure we have some buffer space */ |
648db22b |
467 | if (state.state->size == 0 && gz_init(state) == -1) |
468 | return state.state->error; |
b24e7fce |
469 | |
470 | /* check for seek request */ |
648db22b |
471 | if (state.state->seek) { |
472 | state.state->seek = 0; |
473 | if (gz_zero(state, state.state->skip) == -1) |
474 | return state.state->error; |
b24e7fce |
475 | } |
476 | |
477 | /* do the printf() into the input buffer, put length in len -- the input |
478 | buffer is double-sized just for this function, so there is guaranteed to |
648db22b |
479 | be state.state->size bytes available after the current contents */ |
b24e7fce |
480 | if (strm->avail_in == 0) |
648db22b |
481 | strm->next_in = state.state->in; |
b24e7fce |
482 | next = (char *)(strm->next_in + strm->avail_in); |
648db22b |
483 | next[state.state->size - 1] = 0; |
b24e7fce |
484 | #ifdef NO_snprintf |
485 | # ifdef HAS_sprintf_void |
486 | sprintf(next, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, |
487 | a13, a14, a15, a16, a17, a18, a19, a20); |
488 | for (len = 0; len < size; len++) |
489 | if (next[len] == 0) |
490 | break; |
491 | # else |
492 | len = sprintf(next, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, |
493 | a12, a13, a14, a15, a16, a17, a18, a19, a20); |
494 | # endif |
495 | #else |
496 | # ifdef HAS_snprintf_void |
648db22b |
497 | snprintf(next, state.state->size, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, |
b24e7fce |
498 | a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20); |
499 | len = strlen(next); |
500 | # else |
648db22b |
501 | len = snprintf(next, state.state->size, format, a1, a2, a3, a4, a5, a6, a7, a8, |
b24e7fce |
502 | a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20); |
503 | # endif |
504 | #endif |
505 | |
506 | /* check that printf() results fit in buffer */ |
648db22b |
507 | if (len == 0 || len >= state.state->size || next[state.state->size - 1] != 0) |
b24e7fce |
508 | return 0; |
509 | |
510 | /* update buffer and position, compress first half if past that */ |
511 | strm->avail_in += len; |
648db22b |
512 | state.state->x.pos += len; |
513 | if (strm->avail_in >= state.state->size) { |
514 | left = strm->avail_in - state.state->size; |
515 | strm->avail_in = state.state->size; |
b24e7fce |
516 | if (gz_comp(state, Z_NO_FLUSH) == -1) |
648db22b |
517 | return state.state->err; |
518 | memcpy(state.state->in, state.state->in + state.state->size, left); |
519 | strm->next_in = state.state->in; |
b24e7fce |
520 | strm->avail_in = left; |
521 | } |
522 | return (int)len; |
523 | } |
524 | |
525 | #endif |
526 | |
527 | /* -- see zlib.h -- */ |
f535537f |
528 | int ZEXPORT gzflush(gzFile file, int flush) { |
b24e7fce |
529 | gz_statep state; |
530 | |
531 | /* get internal structure */ |
532 | if (file == NULL) |
533 | return Z_STREAM_ERROR; |
648db22b |
534 | state.file = file; |
b24e7fce |
535 | |
536 | /* check that we're writing and that there's no error */ |
648db22b |
537 | if (state.state->mode != GZ_WRITE || state.state->err != Z_OK) |
b24e7fce |
538 | return Z_STREAM_ERROR; |
539 | |
540 | /* check flush parameter */ |
541 | if (flush < 0 || flush > Z_FINISH) |
542 | return Z_STREAM_ERROR; |
543 | |
544 | /* check for seek request */ |
648db22b |
545 | if (state.state->seek) { |
546 | state.state->seek = 0; |
547 | if (gz_zero(state, state.state->skip) == -1) |
548 | return state.state->err; |
b24e7fce |
549 | } |
550 | |
551 | /* compress remaining data with requested flush */ |
552 | (void)gz_comp(state, flush); |
648db22b |
553 | return state.state->err; |
b24e7fce |
554 | } |
555 | |
556 | /* -- see zlib.h -- */ |
f535537f |
557 | int ZEXPORT gzsetparams(gzFile file, int level, int strategy) { |
b24e7fce |
558 | gz_statep state; |
559 | z_streamp strm; |
560 | |
561 | /* get internal structure */ |
562 | if (file == NULL) |
563 | return Z_STREAM_ERROR; |
648db22b |
564 | state.file = file; |
565 | strm = &(state.state->strm); |
b24e7fce |
566 | |
567 | /* check that we're writing and that there's no error */ |
648db22b |
568 | if (state.state->mode != GZ_WRITE || state.state->err != Z_OK) |
b24e7fce |
569 | return Z_STREAM_ERROR; |
570 | |
571 | /* if no change is requested, then do nothing */ |
648db22b |
572 | if (level == state.state->level && strategy == state.state->strategy) |
b24e7fce |
573 | return Z_OK; |
574 | |
575 | /* check for seek request */ |
648db22b |
576 | if (state.state->seek) { |
577 | state.state->seek = 0; |
578 | if (gz_zero(state, state.state->skip) == -1) |
579 | return state.state->err; |
b24e7fce |
580 | } |
581 | |
582 | /* change compression parameters for subsequent input */ |
648db22b |
583 | if (state.state->size) { |
b24e7fce |
584 | /* flush previous input with previous parameters before changing */ |
585 | if (strm->avail_in && gz_comp(state, Z_BLOCK) == -1) |
648db22b |
586 | return state.state->err; |
b24e7fce |
587 | deflateParams(strm, level, strategy); |
588 | } |
648db22b |
589 | state.state->level = level; |
590 | state.state->strategy = strategy; |
b24e7fce |
591 | return Z_OK; |
592 | } |
593 | |
594 | /* -- see zlib.h -- */ |
f535537f |
595 | int ZEXPORT gzclose_w(gzFile file) { |
b24e7fce |
596 | int ret = Z_OK; |
597 | gz_statep state; |
598 | |
599 | /* get internal structure */ |
600 | if (file == NULL) |
601 | return Z_STREAM_ERROR; |
648db22b |
602 | state.file = file; |
b24e7fce |
603 | |
604 | /* check that we're writing */ |
648db22b |
605 | if (state.state->mode != GZ_WRITE) |
b24e7fce |
606 | return Z_STREAM_ERROR; |
607 | |
608 | /* check for seek request */ |
648db22b |
609 | if (state.state->seek) { |
610 | state.state->seek = 0; |
611 | if (gz_zero(state, state.state->skip) == -1) |
612 | ret = state.state->err; |
b24e7fce |
613 | } |
614 | |
615 | /* flush, free memory, and close file */ |
616 | if (gz_comp(state, Z_FINISH) == -1) |
648db22b |
617 | ret = state.state->err; |
618 | if (state.state->size) { |
619 | if (!state.state->direct) { |
620 | (void)deflateEnd(&(state.state->strm)); |
621 | free(state.state->out); |
b24e7fce |
622 | } |
648db22b |
623 | free(state.state->in); |
b24e7fce |
624 | } |
625 | gz_error(state, Z_OK, NULL); |
648db22b |
626 | free(state.state->path); |
627 | if (close(state.state->fd) == -1) |
b24e7fce |
628 | ret = Z_ERRNO; |
648db22b |
629 | free(state.state); |
b24e7fce |
630 | return ret; |
631 | } |