b24e7fce |
1 | /* gzwrite.c -- zlib functions for writing gzip files |
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2 | * Copyright (C) 2004-2019 Mark Adler |
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3 | * For conditions of distribution and use, see copyright notice in zlib.h |
4 | */ |
5 | |
6 | #include "gzguts.h" |
7 | |
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8 | /* Initialize state for writing a gzip file. Mark initialization by setting |
9 | state->size to non-zero. Return -1 on a memory allocation failure, or 0 on |
10 | success. */ |
648db22b |
11 | local int gz_init(gz_statep state) { |
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12 | int ret; |
13 | z_streamp strm = &(state->strm); |
14 | |
15 | /* allocate input buffer (double size for gzprintf) */ |
16 | state->in = (unsigned char *)malloc(state->want << 1); |
17 | if (state->in == NULL) { |
18 | gz_error(state, Z_MEM_ERROR, "out of memory"); |
19 | return -1; |
20 | } |
21 | |
22 | /* only need output buffer and deflate state if compressing */ |
23 | if (!state->direct) { |
24 | /* allocate output buffer */ |
25 | state->out = (unsigned char *)malloc(state->want); |
26 | if (state->out == NULL) { |
27 | free(state->in); |
28 | gz_error(state, Z_MEM_ERROR, "out of memory"); |
29 | return -1; |
30 | } |
31 | |
32 | /* allocate deflate memory, set up for gzip compression */ |
33 | strm->zalloc = Z_NULL; |
34 | strm->zfree = Z_NULL; |
35 | strm->opaque = Z_NULL; |
36 | ret = deflateInit2(strm, state->level, Z_DEFLATED, |
37 | MAX_WBITS + 16, DEF_MEM_LEVEL, state->strategy); |
38 | if (ret != Z_OK) { |
39 | free(state->out); |
40 | free(state->in); |
41 | gz_error(state, Z_MEM_ERROR, "out of memory"); |
42 | return -1; |
43 | } |
44 | strm->next_in = NULL; |
45 | } |
46 | |
47 | /* mark state as initialized */ |
48 | state->size = state->want; |
49 | |
50 | /* initialize write buffer if compressing */ |
51 | if (!state->direct) { |
52 | strm->avail_out = state->size; |
53 | strm->next_out = state->out; |
54 | state->x.next = strm->next_out; |
55 | } |
56 | return 0; |
57 | } |
58 | |
59 | /* Compress whatever is at avail_in and next_in and write to the output file. |
60 | Return -1 if there is an error writing to the output file or if gz_init() |
61 | fails to allocate memory, otherwise 0. flush is assumed to be a valid |
62 | deflate() flush value. If flush is Z_FINISH, then the deflate() state is |
63 | reset to start a new gzip stream. If gz->direct is true, then simply write |
64 | to the output file without compressing, and ignore flush. */ |
648db22b |
65 | local int gz_comp(gz_statep state, int flush) { |
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66 | int ret, writ; |
67 | unsigned have, put, max = ((unsigned)-1 >> 2) + 1; |
68 | z_streamp strm = &(state->strm); |
69 | |
70 | /* allocate memory if this is the first time through */ |
71 | if (state->size == 0 && gz_init(state) == -1) |
72 | return -1; |
73 | |
74 | /* write directly if requested */ |
75 | if (state->direct) { |
76 | while (strm->avail_in) { |
77 | put = strm->avail_in > max ? max : strm->avail_in; |
78 | writ = write(state->fd, strm->next_in, put); |
79 | if (writ < 0) { |
80 | gz_error(state, Z_ERRNO, zstrerror()); |
81 | return -1; |
82 | } |
83 | strm->avail_in -= (unsigned)writ; |
84 | strm->next_in += writ; |
85 | } |
86 | return 0; |
87 | } |
88 | |
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89 | /* check for a pending reset */ |
90 | if (state->reset) { |
91 | /* don't start a new gzip member unless there is data to write */ |
92 | if (strm->avail_in == 0) |
93 | return 0; |
94 | deflateReset(strm); |
95 | state->reset = 0; |
96 | } |
97 | |
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98 | /* run deflate() on provided input until it produces no more output */ |
99 | ret = Z_OK; |
100 | do { |
101 | /* write out current buffer contents if full, or if flushing, but if |
102 | doing Z_FINISH then don't write until we get to Z_STREAM_END */ |
103 | if (strm->avail_out == 0 || (flush != Z_NO_FLUSH && |
104 | (flush != Z_FINISH || ret == Z_STREAM_END))) { |
105 | while (strm->next_out > state->x.next) { |
106 | put = strm->next_out - state->x.next > (int)max ? max : |
107 | (unsigned)(strm->next_out - state->x.next); |
108 | writ = write(state->fd, state->x.next, put); |
109 | if (writ < 0) { |
110 | gz_error(state, Z_ERRNO, zstrerror()); |
111 | return -1; |
112 | } |
113 | state->x.next += writ; |
114 | } |
115 | if (strm->avail_out == 0) { |
116 | strm->avail_out = state->size; |
117 | strm->next_out = state->out; |
118 | state->x.next = state->out; |
119 | } |
120 | } |
121 | |
122 | /* compress */ |
123 | have = strm->avail_out; |
124 | ret = deflate(strm, flush); |
125 | if (ret == Z_STREAM_ERROR) { |
126 | gz_error(state, Z_STREAM_ERROR, |
127 | "internal error: deflate stream corrupt"); |
128 | return -1; |
129 | } |
130 | have -= strm->avail_out; |
131 | } while (have); |
132 | |
133 | /* if that completed a deflate stream, allow another to start */ |
134 | if (flush == Z_FINISH) |
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135 | state->reset = 1; |
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136 | |
137 | /* all done, no errors */ |
138 | return 0; |
139 | } |
140 | |
141 | /* Compress len zeros to output. Return -1 on a write error or memory |
142 | allocation failure by gz_comp(), or 0 on success. */ |
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143 | local int gz_zero(gz_statep state, z_off64_t len) { |
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144 | int first; |
145 | unsigned n; |
146 | z_streamp strm = &(state->strm); |
147 | |
148 | /* consume whatever's left in the input buffer */ |
149 | if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1) |
150 | return -1; |
151 | |
152 | /* compress len zeros (len guaranteed > 0) */ |
153 | first = 1; |
154 | while (len) { |
155 | n = GT_OFF(state->size) || (z_off64_t)state->size > len ? |
156 | (unsigned)len : state->size; |
157 | if (first) { |
158 | memset(state->in, 0, n); |
159 | first = 0; |
160 | } |
161 | strm->avail_in = n; |
162 | strm->next_in = state->in; |
163 | state->x.pos += n; |
164 | if (gz_comp(state, Z_NO_FLUSH) == -1) |
165 | return -1; |
166 | len -= n; |
167 | } |
168 | return 0; |
169 | } |
170 | |
171 | /* Write len bytes from buf to file. Return the number of bytes written. If |
172 | the returned value is less than len, then there was an error. */ |
648db22b |
173 | local z_size_t gz_write(gz_statep state, voidpc buf, z_size_t len) { |
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174 | z_size_t put = len; |
175 | |
176 | /* if len is zero, avoid unnecessary operations */ |
177 | if (len == 0) |
178 | return 0; |
179 | |
180 | /* allocate memory if this is the first time through */ |
181 | if (state->size == 0 && gz_init(state) == -1) |
182 | return 0; |
183 | |
184 | /* check for seek request */ |
185 | if (state->seek) { |
186 | state->seek = 0; |
187 | if (gz_zero(state, state->skip) == -1) |
188 | return 0; |
189 | } |
190 | |
191 | /* for small len, copy to input buffer, otherwise compress directly */ |
192 | if (len < state->size) { |
193 | /* copy to input buffer, compress when full */ |
194 | do { |
195 | unsigned have, copy; |
196 | |
197 | if (state->strm.avail_in == 0) |
198 | state->strm.next_in = state->in; |
199 | have = (unsigned)((state->strm.next_in + state->strm.avail_in) - |
200 | state->in); |
201 | copy = state->size - have; |
202 | if (copy > len) |
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203 | copy = (unsigned)len; |
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204 | memcpy(state->in + have, buf, copy); |
205 | state->strm.avail_in += copy; |
206 | state->x.pos += copy; |
207 | buf = (const char *)buf + copy; |
208 | len -= copy; |
209 | if (len && gz_comp(state, Z_NO_FLUSH) == -1) |
210 | return 0; |
211 | } while (len); |
212 | } |
213 | else { |
214 | /* consume whatever's left in the input buffer */ |
215 | if (state->strm.avail_in && gz_comp(state, Z_NO_FLUSH) == -1) |
216 | return 0; |
217 | |
218 | /* directly compress user buffer to file */ |
219 | state->strm.next_in = (z_const Bytef *)buf; |
220 | do { |
221 | unsigned n = (unsigned)-1; |
222 | if (n > len) |
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223 | n = (unsigned)len; |
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224 | state->strm.avail_in = n; |
225 | state->x.pos += n; |
226 | if (gz_comp(state, Z_NO_FLUSH) == -1) |
227 | return 0; |
228 | len -= n; |
229 | } while (len); |
230 | } |
231 | |
232 | /* input was all buffered or compressed */ |
233 | return put; |
234 | } |
235 | |
236 | /* -- see zlib.h -- */ |
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237 | int ZEXPORT gzwrite(gzFile file, voidpc buf, unsigned len) { |
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238 | gz_statep state; |
239 | |
240 | /* get internal structure */ |
241 | if (file == NULL) |
242 | return 0; |
243 | state = (gz_statep)file; |
244 | |
245 | /* check that we're writing and that there's no error */ |
246 | if (state->mode != GZ_WRITE || state->err != Z_OK) |
247 | return 0; |
248 | |
249 | /* since an int is returned, make sure len fits in one, otherwise return |
250 | with an error (this avoids a flaw in the interface) */ |
251 | if ((int)len < 0) { |
252 | gz_error(state, Z_DATA_ERROR, "requested length does not fit in int"); |
253 | return 0; |
254 | } |
255 | |
256 | /* write len bytes from buf (the return value will fit in an int) */ |
257 | return (int)gz_write(state, buf, len); |
258 | } |
259 | |
260 | /* -- see zlib.h -- */ |
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261 | z_size_t ZEXPORT gzfwrite(voidpc buf, z_size_t size, z_size_t nitems, |
262 | gzFile file) { |
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263 | z_size_t len; |
264 | gz_statep state; |
265 | |
266 | /* get internal structure */ |
267 | if (file == NULL) |
268 | return 0; |
269 | state = (gz_statep)file; |
270 | |
271 | /* check that we're writing and that there's no error */ |
272 | if (state->mode != GZ_WRITE || state->err != Z_OK) |
273 | return 0; |
274 | |
275 | /* compute bytes to read -- error on overflow */ |
276 | len = nitems * size; |
277 | if (size && len / size != nitems) { |
278 | gz_error(state, Z_STREAM_ERROR, "request does not fit in a size_t"); |
279 | return 0; |
280 | } |
281 | |
282 | /* write len bytes to buf, return the number of full items written */ |
283 | return len ? gz_write(state, buf, len) / size : 0; |
284 | } |
285 | |
286 | /* -- see zlib.h -- */ |
648db22b |
287 | int ZEXPORT gzputc(gzFile file, int c) { |
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288 | unsigned have; |
289 | unsigned char buf[1]; |
290 | gz_statep state; |
291 | z_streamp strm; |
292 | |
293 | /* get internal structure */ |
294 | if (file == NULL) |
295 | return -1; |
296 | state = (gz_statep)file; |
297 | strm = &(state->strm); |
298 | |
299 | /* check that we're writing and that there's no error */ |
300 | if (state->mode != GZ_WRITE || state->err != Z_OK) |
301 | return -1; |
302 | |
303 | /* check for seek request */ |
304 | if (state->seek) { |
305 | state->seek = 0; |
306 | if (gz_zero(state, state->skip) == -1) |
307 | return -1; |
308 | } |
309 | |
310 | /* try writing to input buffer for speed (state->size == 0 if buffer not |
311 | initialized) */ |
312 | if (state->size) { |
313 | if (strm->avail_in == 0) |
314 | strm->next_in = state->in; |
315 | have = (unsigned)((strm->next_in + strm->avail_in) - state->in); |
316 | if (have < state->size) { |
317 | state->in[have] = (unsigned char)c; |
318 | strm->avail_in++; |
319 | state->x.pos++; |
320 | return c & 0xff; |
321 | } |
322 | } |
323 | |
324 | /* no room in buffer or not initialized, use gz_write() */ |
325 | buf[0] = (unsigned char)c; |
326 | if (gz_write(state, buf, 1) != 1) |
327 | return -1; |
328 | return c & 0xff; |
329 | } |
330 | |
331 | /* -- see zlib.h -- */ |
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332 | int ZEXPORT gzputs(gzFile file, const char *s) { |
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333 | z_size_t len, put; |
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334 | gz_statep state; |
335 | |
336 | /* get internal structure */ |
337 | if (file == NULL) |
338 | return -1; |
339 | state = (gz_statep)file; |
340 | |
341 | /* check that we're writing and that there's no error */ |
342 | if (state->mode != GZ_WRITE || state->err != Z_OK) |
343 | return -1; |
344 | |
345 | /* write string */ |
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346 | len = strlen(s); |
347 | if ((int)len < 0 || (unsigned)len != len) { |
348 | gz_error(state, Z_STREAM_ERROR, "string length does not fit in int"); |
349 | return -1; |
350 | } |
351 | put = gz_write(state, s, len); |
352 | return put < len ? -1 : (int)len; |
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353 | } |
354 | |
355 | #if defined(STDC) || defined(Z_HAVE_STDARG_H) |
356 | #include <stdarg.h> |
357 | |
358 | /* -- see zlib.h -- */ |
648db22b |
359 | int ZEXPORTVA gzvprintf(gzFile file, const char *format, va_list va) { |
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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; |
369 | state = (gz_statep)file; |
370 | strm = &(state->strm); |
371 | |
372 | /* check that we're writing and that there's no error */ |
373 | if (state->mode != GZ_WRITE || state->err != Z_OK) |
374 | return Z_STREAM_ERROR; |
375 | |
376 | /* make sure we have some buffer space */ |
377 | if (state->size == 0 && gz_init(state) == -1) |
378 | return state->err; |
379 | |
380 | /* check for seek request */ |
381 | if (state->seek) { |
382 | state->seek = 0; |
383 | if (gz_zero(state, state->skip) == -1) |
384 | return state->err; |
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 |
389 | be state->size bytes available after the current contents */ |
390 | if (strm->avail_in == 0) |
391 | strm->next_in = state->in; |
392 | next = (char *)(state->in + (strm->next_in - state->in) + strm->avail_in); |
393 | next[state->size - 1] = 0; |
394 | #ifdef NO_vsnprintf |
395 | # ifdef HAS_vsprintf_void |
396 | (void)vsprintf(next, format, va); |
397 | for (len = 0; len < state->size; len++) |
398 | if (next[len] == 0) break; |
399 | # else |
400 | len = vsprintf(next, format, va); |
401 | # endif |
402 | #else |
403 | # ifdef HAS_vsnprintf_void |
404 | (void)vsnprintf(next, state->size, format, va); |
405 | len = strlen(next); |
406 | # else |
407 | len = vsnprintf(next, state->size, format, va); |
408 | # endif |
409 | #endif |
410 | |
411 | /* check that printf() results fit in buffer */ |
412 | if (len == 0 || (unsigned)len >= state->size || next[state->size - 1] != 0) |
413 | return 0; |
414 | |
415 | /* update buffer and position, compress first half if past that */ |
416 | strm->avail_in += (unsigned)len; |
417 | state->x.pos += len; |
418 | if (strm->avail_in >= state->size) { |
419 | left = strm->avail_in - state->size; |
420 | strm->avail_in = state->size; |
421 | if (gz_comp(state, Z_NO_FLUSH) == -1) |
422 | return state->err; |
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423 | memmove(state->in, state->in + state->size, left); |
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424 | strm->next_in = state->in; |
425 | strm->avail_in = left; |
426 | } |
427 | return len; |
428 | } |
429 | |
648db22b |
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 -- */ |
648db22b |
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; |
456 | strm = &(state->strm); |
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 */ |
463 | if (state->mode != GZ_WRITE || state->err != Z_OK) |
464 | return Z_STREAM_ERROR; |
465 | |
466 | /* make sure we have some buffer space */ |
467 | if (state->size == 0 && gz_init(state) == -1) |
468 | return state->error; |
469 | |
470 | /* check for seek request */ |
471 | if (state->seek) { |
472 | state->seek = 0; |
473 | if (gz_zero(state, state->skip) == -1) |
474 | return state->error; |
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 |
479 | be state->size bytes available after the current contents */ |
480 | if (strm->avail_in == 0) |
481 | strm->next_in = state->in; |
482 | next = (char *)(strm->next_in + strm->avail_in); |
483 | next[state->size - 1] = 0; |
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 |
497 | snprintf(next, state->size, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, |
498 | a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20); |
499 | len = strlen(next); |
500 | # else |
501 | len = snprintf(next, state->size, format, a1, a2, a3, a4, a5, a6, a7, a8, |
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 */ |
507 | if (len == 0 || len >= state->size || next[state->size - 1] != 0) |
508 | return 0; |
509 | |
510 | /* update buffer and position, compress first half if past that */ |
511 | strm->avail_in += len; |
512 | state->x.pos += len; |
513 | if (strm->avail_in >= state->size) { |
514 | left = strm->avail_in - state->size; |
515 | strm->avail_in = state->size; |
516 | if (gz_comp(state, Z_NO_FLUSH) == -1) |
517 | return state->err; |
9e052883 |
518 | memmove(state->in, state->in + state->size, left); |
b24e7fce |
519 | strm->next_in = state->in; |
520 | strm->avail_in = left; |
521 | } |
522 | return (int)len; |
523 | } |
524 | |
525 | #endif |
526 | |
527 | /* -- see zlib.h -- */ |
648db22b |
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; |
534 | state = (gz_statep)file; |
535 | |
536 | /* check that we're writing and that there's no error */ |
537 | if (state->mode != GZ_WRITE || state->err != Z_OK) |
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 */ |
545 | if (state->seek) { |
546 | state->seek = 0; |
547 | if (gz_zero(state, state->skip) == -1) |
548 | return state->err; |
549 | } |
550 | |
551 | /* compress remaining data with requested flush */ |
552 | (void)gz_comp(state, flush); |
553 | return state->err; |
554 | } |
555 | |
556 | /* -- see zlib.h -- */ |
648db22b |
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; |
564 | state = (gz_statep)file; |
565 | strm = &(state->strm); |
566 | |
567 | /* check that we're writing and that there's no error */ |
648db22b |
568 | if (state->mode != GZ_WRITE || state->err != Z_OK || state->direct) |
b24e7fce |
569 | return Z_STREAM_ERROR; |
570 | |
571 | /* if no change is requested, then do nothing */ |
572 | if (level == state->level && strategy == state->strategy) |
573 | return Z_OK; |
574 | |
575 | /* check for seek request */ |
576 | if (state->seek) { |
577 | state->seek = 0; |
578 | if (gz_zero(state, state->skip) == -1) |
579 | return state->err; |
580 | } |
581 | |
582 | /* change compression parameters for subsequent input */ |
583 | if (state->size) { |
584 | /* flush previous input with previous parameters before changing */ |
585 | if (strm->avail_in && gz_comp(state, Z_BLOCK) == -1) |
586 | return state->err; |
587 | deflateParams(strm, level, strategy); |
588 | } |
589 | state->level = level; |
590 | state->strategy = strategy; |
591 | return Z_OK; |
592 | } |
593 | |
594 | /* -- see zlib.h -- */ |
648db22b |
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; |
602 | state = (gz_statep)file; |
603 | |
604 | /* check that we're writing */ |
605 | if (state->mode != GZ_WRITE) |
606 | return Z_STREAM_ERROR; |
607 | |
608 | /* check for seek request */ |
609 | if (state->seek) { |
610 | state->seek = 0; |
611 | if (gz_zero(state, state->skip) == -1) |
612 | ret = state->err; |
613 | } |
614 | |
615 | /* flush, free memory, and close file */ |
616 | if (gz_comp(state, Z_FINISH) == -1) |
617 | ret = state->err; |
618 | if (state->size) { |
619 | if (!state->direct) { |
620 | (void)deflateEnd(&(state->strm)); |
621 | free(state->out); |
622 | } |
623 | free(state->in); |
624 | } |
625 | gz_error(state, Z_OK, NULL); |
626 | free(state->path); |
627 | if (close(state->fd) == -1) |
628 | ret = Z_ERRNO; |
629 | free(state); |
630 | return ret; |
631 | } |