Bug Summary

File:out/../deps/v8/third_party/zlib/gzwrite.c
Warning:line 300, column 44
Division by zero

Annotated Source Code

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clang -cc1 -cc1 -triple x86_64-unknown-linux-gnu -analyze -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name gzwrite.c -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model pic -pic-level 2 -pic-is-pie -mframe-pointer=all -relaxed-aliasing -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -ffunction-sections -fdata-sections -fcoverage-compilation-dir=/home/maurizio/node-v18.6.0/out -resource-dir /usr/local/lib/clang/16.0.0 -D _GLIBCXX_USE_CXX11_ABI=1 -D NODE_OPENSSL_CONF_NAME=nodejs_conf -D NODE_OPENSSL_HAS_QUIC -D V8_GYP_BUILD -D V8_TYPED_ARRAY_MAX_SIZE_IN_HEAP=64 -D __STDC_FORMAT_MACROS -D OPENSSL_NO_PINSHARED -D OPENSSL_THREADS -D V8_TARGET_ARCH_X64 -D V8_HAVE_TARGET_OS -D V8_TARGET_OS_LINUX -D V8_EMBEDDER_STRING="-node.8" -D ENABLE_DISASSEMBLER -D V8_PROMISE_INTERNAL_FIELD_COUNT=1 -D V8_SHORT_BUILTIN_CALLS -D OBJECT_PRINT -D V8_INTL_SUPPORT -D V8_ATOMIC_OBJECT_FIELD_WRITES -D V8_ENABLE_LAZY_SOURCE_POSITIONS -D V8_USE_SIPHASH -D V8_SHARED_RO_HEAP -D V8_WIN64_UNWINDING_INFO -D V8_ENABLE_REGEXP_INTERPRETER_THREADED_DISPATCH -D V8_SNAPSHOT_COMPRESSION -D V8_ENABLE_WEBASSEMBLY -D V8_ENABLE_JAVASCRIPT_PROMISE_HOOKS -D V8_ALLOCATION_FOLDING -D V8_ALLOCATION_SITE_TRACKING -D V8_SCRIPTORMODULE_LEGACY_LIFETIME -D V8_ADVANCED_BIGINT_ALGORITHMS -D ZLIB_IMPLEMENTATION -I ../deps/v8 -I ../deps/v8/include -I ../deps/v8/third_party/zlib -I ../deps/v8/third_party/zlib/google -internal-isystem /usr/local/lib/clang/16.0.0/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-redhat-linux/8/../../../../x86_64-redhat-linux/include -internal-externc-isystem /include -internal-externc-isystem /usr/include -O3 -Wno-unused-parameter -Wno-return-type -fdebug-compilation-dir=/home/maurizio/node-v18.6.0/out -ferror-limit 19 -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -analyzer-output=html -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/scan-build-2022-08-22-142216-507842-1 -x c ../deps/v8/third_party/zlib/gzwrite.c
1/* gzwrite.c -- zlib functions for writing gzip files
2 * Copyright (C) 2004-2017 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 */
9localstatic int gz_init OF((gz_statep))(gz_statep);
10localstatic int gz_comp OF((gz_statep, int))(gz_statep, int);
11localstatic int gz_zero OF((gz_statep, z_off64_t))(gz_statep, off_t);
12localstatic z_size_t gz_write OF((gz_statep, voidpc, z_size_t))(gz_statep, Cr_z_voidpc, z_size_t);
13
14/* Initialize state for writing a gzip file. Mark initialization by setting
15 state->size to non-zero. Return -1 on a memory allocation failure, or 0 on
16 success. */
17localstatic int gz_init(state)
18 gz_statep state;
19{
20 int ret;
21 z_streamp strm = &(state->strm);
22
23 /* allocate input buffer (double size for gzprintf) */
24 state->in = (unsigned char *)malloc(state->want << 1);
25 if (state->in == NULL((void*)0)) {
26 gz_errorCr_z_gz_error(state, Z_MEM_ERROR(-4), "out of memory");
27 return -1;
28 }
29
30 /* only need output buffer and deflate state if compressing */
31 if (!state->direct) {
32 /* allocate output buffer */
33 state->out = (unsigned char *)malloc(state->want);
34 if (state->out == NULL((void*)0)) {
35 free(state->in);
36 gz_errorCr_z_gz_error(state, Z_MEM_ERROR(-4), "out of memory");
37 return -1;
38 }
39
40 /* allocate deflate memory, set up for gzip compression */
41 strm->zalloc = Z_NULL0;
42 strm->zfree = Z_NULL0;
43 strm->opaque = Z_NULL0;
44 ret = deflateInit2(strm, state->level, Z_DEFLATED,Cr_z_deflateInit2_((strm),(state->level),(8),(15 + 16),(8)
, (state->strategy), "1.2.11", (int)sizeof(z_stream))
45 MAX_WBITS + 16, DEF_MEM_LEVEL, state->strategy)Cr_z_deflateInit2_((strm),(state->level),(8),(15 + 16),(8)
, (state->strategy), "1.2.11", (int)sizeof(z_stream));
46 if (ret != Z_OK0) {
47 free(state->out);
48 free(state->in);
49 gz_errorCr_z_gz_error(state, Z_MEM_ERROR(-4), "out of memory");
50 return -1;
51 }
52 strm->next_in = NULL((void*)0);
53 }
54
55 /* mark state as initialized */
56 state->size = state->want;
57
58 /* initialize write buffer if compressing */
59 if (!state->direct) {
60 strm->avail_out = state->size;
61 strm->next_out = state->out;
62 state->x.next = strm->next_out;
63 }
64 return 0;
65}
66
67/* Compress whatever is at avail_in and next_in and write to the output file.
68 Return -1 if there is an error writing to the output file or if gz_init()
69 fails to allocate memory, otherwise 0. flush is assumed to be a valid
70 deflate() flush value. If flush is Z_FINISH, then the deflate() state is
71 reset to start a new gzip stream. If gz->direct is true, then simply write
72 to the output file without compressing, and ignore flush. */
73localstatic int gz_comp(state, flush)
74 gz_statep state;
75 int flush;
76{
77 int ret, writ;
78 unsigned have, put, max = ((unsigned)-1 >> 2) + 1;
79 z_streamp strm = &(state->strm);
80
81 /* allocate memory if this is the first time through */
82 if (state->size == 0 && gz_init(state) == -1)
83 return -1;
84
85 /* write directly if requested */
86 if (state->direct) {
87 while (strm->avail_in) {
88 put = strm->avail_in > max ? max : strm->avail_in;
89 writ = write(state->fd, strm->next_in, put);
90 if (writ < 0) {
91 gz_errorCr_z_gz_error(state, Z_ERRNO(-1), zstrerror()strerror((*__errno_location ())));
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_OK0;
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_FLUSH0 &&
106 (flush != Z_FINISH4 || ret == Z_STREAM_END1))) {
107 while (strm->next_out > state->x.next) {
108 put = strm->next_out - state->x.next > (int)max ? max :
109 (unsigned)(strm->next_out - state->x.next);
110 writ = write(state->fd, state->x.next, put);
111 if (writ < 0) {
112 gz_errorCr_z_gz_error(state, Z_ERRNO(-1), zstrerror()strerror((*__errno_location ())));
113 return -1;
114 }
115 state->x.next += writ;
116 }
117 if (strm->avail_out == 0) {
118 strm->avail_out = state->size;
119 strm->next_out = state->out;
120 state->x.next = state->out;
121 }
122 }
123
124 /* compress */
125 have = strm->avail_out;
126 ret = deflateCr_z_deflate(strm, flush);
127 if (ret == Z_STREAM_ERROR(-2)) {
128 gz_errorCr_z_gz_error(state, Z_STREAM_ERROR(-2),
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_FINISH4)
137 deflateResetCr_z_deflateReset(strm);
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. */
145localstatic int gz_zero(state, len)
146 gz_statep state;
147 z_off64_toff_t len;
148{
149 int first;
150 unsigned n;
151 z_streamp strm = &(state->strm);
152
153 /* consume whatever's left in the input buffer */
154 if (strm->avail_in && gz_comp(state, Z_NO_FLUSH0) == -1)
155 return -1;
156
157 /* compress len zeros (len guaranteed > 0) */
158 first = 1;
159 while (len) {
160 n = GT_OFF(state->size)(sizeof(int) == sizeof(off_t) && (state->size) >
2147483647) || (z_off64_toff_t)state->size > len ?
161 (unsigned)len : state->size;
162 if (first) {
163 memset(state->in, 0, n);
164 first = 0;
165 }
166 strm->avail_in = n;
167 strm->next_in = state->in;
168 state->x.pos += n;
169 if (gz_comp(state, Z_NO_FLUSH0) == -1)
170 return -1;
171 len -= n;
172 }
173 return 0;
174}
175
176/* Write len bytes from buf to file. Return the number of bytes written. If
177 the returned value is less than len, then there was an error. */
178localstatic z_size_t gz_write(state, buf, len)
179 gz_statep state;
180 voidpcCr_z_voidpc buf;
181 z_size_t len;
182{
183 z_size_t put = len;
184
185 /* if len is zero, avoid unnecessary operations */
186 if (len == 0)
187 return 0;
188
189 /* allocate memory if this is the first time through */
190 if (state->size == 0 && gz_init(state) == -1)
191 return 0;
192
193 /* check for seek request */
194 if (state->seek) {
195 state->seek = 0;
196 if (gz_zero(state, state->skip) == -1)
197 return 0;
198 }
199
200 /* for small len, copy to input buffer, otherwise compress directly */
201 if (len < state->size) {
202 /* copy to input buffer, compress when full */
203 do {
204 unsigned have, copy;
205
206 if (state->strm.avail_in == 0)
207 state->strm.next_in = state->in;
208 have = (unsigned)((state->strm.next_in + state->strm.avail_in) -
209 state->in);
210 copy = state->size - have;
211 if (copy > len)
212 copy = (unsigned)len;
213 memcpy(state->in + have, buf, copy);
214 state->strm.avail_in += copy;
215 state->x.pos += copy;
216 buf = (const char *)buf + copy;
217 len -= copy;
218 if (len && gz_comp(state, Z_NO_FLUSH0) == -1)
219 return 0;
220 } while (len);
221 }
222 else {
223 /* consume whatever's left in the input buffer */
224 if (state->strm.avail_in && gz_comp(state, Z_NO_FLUSH0) == -1)
225 return 0;
226
227 /* directly compress user buffer to file */
228 state->strm.next_in = (z_const BytefCr_z_Bytef *)buf;
229 do {
230 unsigned n = (unsigned)-1;
231 if (n > len)
232 n = (unsigned)len;
233 state->strm.avail_in = n;
234 state->x.pos += n;
235 if (gz_comp(state, Z_NO_FLUSH0) == -1)
236 return 0;
237 len -= n;
238 } while (len);
239 }
240
241 /* input was all buffered or compressed */
242 return put;
243}
244
245/* -- see zlib.h -- */
246int ZEXPORT gzwriteCr_z_gzwrite(file, buf, len)
247 gzFileCr_z_gzFile file;
248 voidpcCr_z_voidpc buf;
249 unsigned len;
250{
251 gz_statep state;
252
253 /* get internal structure */
254 if (file == NULL((void*)0))
255 return 0;
256 state = (gz_statep)file;
257
258 /* check that we're writing and that there's no error */
259 if (state->mode != GZ_WRITE31153 || state->err != Z_OK0)
260 return 0;
261
262 /* since an int is returned, make sure len fits in one, otherwise return
263 with an error (this avoids a flaw in the interface) */
264 if ((int)len < 0) {
265 gz_errorCr_z_gz_error(state, Z_DATA_ERROR(-3), "requested length does not fit in int");
266 return 0;
267 }
268
269 /* write len bytes from buf (the return value will fit in an int) */
270 return (int)gz_write(state, buf, len);
271}
272
273/* -- see zlib.h -- */
274z_size_t ZEXPORT gzfwriteCr_z_gzfwrite(buf, size, nitems, file)
275 voidpcCr_z_voidpc buf;
276 z_size_t size;
277 z_size_t nitems;
278 gzFileCr_z_gzFile file;
279{
280 z_size_t len;
281 gz_statep state;
282
283 /* get internal structure */
284 if (file == NULL((void*)0))
1
Assuming 'file' is not equal to NULL
→
2
←
Taking false branch
→
285 return 0;
286 state = (gz_statep)file;
287
288 /* check that we're writing and that there's no error */
289 if (state->mode != GZ_WRITE31153 || state->err != Z_OK0)
3
←
Assuming field 'mode' is equal to GZ_WRITE
→
4
←
Assuming field 'err' is equal to Z_OK
→
5
←
Taking false branch
→
290 return 0;
291
292 /* compute bytes to read -- error on overflow */
293 len = nitems * size;
294 if (size && len / size != nitems) {
6
←
Assuming 'size' is 0
→
295 gz_errorCr_z_gz_error(state, Z_STREAM_ERROR(-2), "request does not fit in a size_t");
296 return 0;
297 }
298
299 /* write len bytes to buf, return the number of full items written */
300 return len ? gz_write(state, buf, len) / size : 0;
7
←
Assuming 'len' is not equal to 0
→
8
←
'?' condition is true
→
9
←
Division by zero
301}
302
303/* -- see zlib.h -- */
304int ZEXPORT gzputcCr_z_gzputc(file, c)
305 gzFileCr_z_gzFile file;
306 int c;
307{
308 unsigned have;
309 unsigned char buf[1];
310 gz_statep state;
311 z_streamp strm;
312
313 /* get internal structure */
314 if (file == NULL((void*)0))
315 return -1;
316 state = (gz_statep)file;
317 strm = &(state->strm);
318
319 /* check that we're writing and that there's no error */
320 if (state->mode != GZ_WRITE31153 || state->err != Z_OK0)
321 return -1;
322
323 /* check for seek request */
324 if (state->seek) {
325 state->seek = 0;
326 if (gz_zero(state, state->skip) == -1)
327 return -1;
328 }
329
330 /* try writing to input buffer for speed (state->size == 0 if buffer not
331 initialized) */
332 if (state->size) {
333 if (strm->avail_in == 0)
334 strm->next_in = state->in;
335 have = (unsigned)((strm->next_in + strm->avail_in) - state->in);
336 if (have < state->size) {
337 state->in[have] = (unsigned char)c;
338 strm->avail_in++;
339 state->x.pos++;
340 return c & 0xff;
341 }
342 }
343
344 /* no room in buffer or not initialized, use gz_write() */
345 buf[0] = (unsigned char)c;
346 if (gz_write(state, buf, 1) != 1)
347 return -1;
348 return c & 0xff;
349}
350
351/* -- see zlib.h -- */
352int ZEXPORT gzputsCr_z_gzputs(file, s)
353 gzFileCr_z_gzFile file;
354 const char *s;
355{
356 z_size_t len, put;
357 gz_statep state;
358
359 /* get internal structure */
360 if (file == NULL((void*)0))
361 return -1;
362 state = (gz_statep)file;
363
364 /* check that we're writing and that there's no error */
365 if (state->mode != GZ_WRITE31153 || state->err != Z_OK0)
366 return -1;
367
368 /* write string */
369 len = strlen(s);
370 if ((int)len < 0 || (unsigned)len != len) {
371 gz_errorCr_z_gz_error(state, Z_STREAM_ERROR(-2), "string length does not fit in int");
372 return -1;
373 }
374 put = gz_write(state, s, len);
375 return put < len ? -1 : (int)len;
376}
377
378#if defined(STDC) || defined(Z_HAVE_STDARG_H)
379#include <stdarg.h>
380
381/* -- see zlib.h -- */
382int ZEXPORTVA gzvprintfCr_z_gzvprintf(gzFileCr_z_gzFile file, const char *format, va_list va)
383{
384 int len;
385 unsigned left;
386 char *next;
387 gz_statep state;
388 z_streamp strm;
389
390 /* get internal structure */
391 if (file == NULL((void*)0))
392 return Z_STREAM_ERROR(-2);
393 state = (gz_statep)file;
394 strm = &(state->strm);
395
396 /* check that we're writing and that there's no error */
397 if (state->mode != GZ_WRITE31153 || state->err != Z_OK0)
398 return Z_STREAM_ERROR(-2);
399
400 /* make sure we have some buffer space */
401 if (state->size == 0 && gz_init(state) == -1)
402 return state->err;
403
404 /* check for seek request */
405 if (state->seek) {
406 state->seek = 0;
407 if (gz_zero(state, state->skip) == -1)
408 return state->err;
409 }
410
411 /* do the printf() into the input buffer, put length in len -- the input
412 buffer is double-sized just for this function, so there is guaranteed to
413 be state->size bytes available after the current contents */
414 if (strm->avail_in == 0)
415 strm->next_in = state->in;
416 next = (char *)(state->in + (strm->next_in - state->in) + strm->avail_in);
417 next[state->size - 1] = 0;
418#ifdef NO_vsnprintf
419# ifdef HAS_vsprintf_void
420 (void)vsprintf(next, format, va);
421 for (len = 0; len < state->size; len++)
422 if (next[len] == 0) break;
423# else
424 len = vsprintf(next, format, va);
425# endif
426#else
427# ifdef HAS_vsnprintf_void
428 (void)vsnprintf(next, state->size, format, va);
429 len = strlen(next);
430# else
431 len = vsnprintf(next, state->size, format, va);
432# endif
433#endif
434
435 /* check that printf() results fit in buffer */
436 if (len == 0 || (unsigned)len >= state->size || next[state->size - 1] != 0)
437 return 0;
438
439 /* update buffer and position, compress first half if past that */
440 strm->avail_in += (unsigned)len;
441 state->x.pos += len;
442 if (strm->avail_in >= state->size) {
443 left = strm->avail_in - state->size;
444 strm->avail_in = state->size;
445 if (gz_comp(state, Z_NO_FLUSH0) == -1)
446 return state->err;
447 memmove(state->in, state->in + state->size, left);
448 strm->next_in = state->in;
449 strm->avail_in = left;
450 }
451 return len;
452}
453
454int ZEXPORTVA gzprintfCr_z_gzprintf(gzFileCr_z_gzFile file, const char *format, ...)
455{
456 va_list va;
457 int ret;
458
459 va_start(va, format)__builtin_va_start(va, format);
460 ret = gzvprintfCr_z_gzvprintf(file, format, va);
461 va_end(va)__builtin_va_end(va);
462 return ret;
463}
464
465#else /* !STDC && !Z_HAVE_STDARG_H */
466
467/* -- see zlib.h -- */
468int ZEXPORTVA gzprintfCr_z_gzprintf (file, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
469 a11, a12, a13, a14, a15, a16, a17, a18, a19, a20)
470 gzFileCr_z_gzFile file;
471 const char *format;
472 int a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
473 a11, a12, a13, a14, a15, a16, a17, a18, a19, a20;
474{
475 unsigned len, left;
476 char *next;
477 gz_statep state;
478 z_streamp strm;
479
480 /* get internal structure */
481 if (file == NULL((void*)0))
482 return Z_STREAM_ERROR(-2);
483 state = (gz_statep)file;
484 strm = &(state->strm);
485
486 /* check that can really pass pointer in ints */
487 if (sizeof(int) != sizeof(void *))
488 return Z_STREAM_ERROR(-2);
489
490 /* check that we're writing and that there's no error */
491 if (state->mode != GZ_WRITE31153 || state->err != Z_OK0)
492 return Z_STREAM_ERROR(-2);
493
494 /* make sure we have some buffer space */
495 if (state->size == 0 && gz_init(state) == -1)
496 return state->error;
497
498 /* check for seek request */
499 if (state->seek) {
500 state->seek = 0;
501 if (gz_zero(state, state->skip) == -1)
502 return state->error;
503 }
504
505 /* do the printf() into the input buffer, put length in len -- the input
506 buffer is double-sized just for this function, so there is guaranteed to
507 be state->size bytes available after the current contents */
508 if (strm->avail_in == 0)
509 strm->next_in = state->in;
510 next = (char *)(strm->next_in + strm->avail_in);
511 next[state->size - 1] = 0;
512#ifdef NO_snprintf
513# ifdef HAS_sprintf_void
514 sprintf(next, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12,
515 a13, a14, a15, a16, a17, a18, a19, a20);
516 for (len = 0; len < size; len++)
517 if (next[len] == 0)
518 break;
519# else
520 len = sprintf(next, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11,
521 a12, a13, a14, a15, a16, a17, a18, a19, a20);
522# endif
523#else
524# ifdef HAS_snprintf_void
525 snprintf(next, state->size, format, a1, a2, a3, a4, a5, a6, a7, a8, a9,
526 a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
527 len = strlen(next);
528# else
529 len = snprintf(next, state->size, format, a1, a2, a3, a4, a5, a6, a7, a8,
530 a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
531# endif
532#endif
533
534 /* check that printf() results fit in buffer */
535 if (len == 0 || len >= state->size || next[state->size - 1] != 0)
536 return 0;
537
538 /* update buffer and position, compress first half if past that */
539 strm->avail_in += len;
540 state->x.pos += len;
541 if (strm->avail_in >= state->size) {
542 left = strm->avail_in - state->size;
543 strm->avail_in = state->size;
544 if (gz_comp(state, Z_NO_FLUSH0) == -1)
545 return state->err;
546 memmove(state->in, state->in + state->size, left);
547 strm->next_in = state->in;
548 strm->avail_in = left;
549 }
550 return (int)len;
551}
552
553#endif
554
555/* -- see zlib.h -- */
556int ZEXPORT gzflushCr_z_gzflush(file, flush)
557 gzFileCr_z_gzFile file;
558 int flush;
559{
560 gz_statep state;
561
562 /* get internal structure */
563 if (file == NULL((void*)0))
564 return Z_STREAM_ERROR(-2);
565 state = (gz_statep)file;
566
567 /* check that we're writing and that there's no error */
568 if (state->mode != GZ_WRITE31153 || state->err != Z_OK0)
569 return Z_STREAM_ERROR(-2);
570
571 /* check flush parameter */
572 if (flush < 0 || flush > Z_FINISH4)
573 return Z_STREAM_ERROR(-2);
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 /* compress remaining data with requested flush */
583 (void)gz_comp(state, flush);
584 return state->err;
585}
586
587/* -- see zlib.h -- */
588int ZEXPORT gzsetparamsCr_z_gzsetparams(file, level, strategy)
589 gzFileCr_z_gzFile file;
590 int level;
591 int strategy;
592{
593 gz_statep state;
594 z_streamp strm;
595
596 /* get internal structure */
597 if (file == NULL((void*)0))
598 return Z_STREAM_ERROR(-2);
599 state = (gz_statep)file;
600 strm = &(state->strm);
601
602 /* check that we're writing and that there's no error */
603 if (state->mode != GZ_WRITE31153 || state->err != Z_OK0)
604 return Z_STREAM_ERROR(-2);
605
606 /* if no change is requested, then do nothing */
607 if (level == state->level && strategy == state->strategy)
608 return Z_OK0;
609
610 /* check for seek request */
611 if (state->seek) {
612 state->seek = 0;
613 if (gz_zero(state, state->skip) == -1)
614 return state->err;
615 }
616
617 /* change compression parameters for subsequent input */
618 if (state->size) {
619 /* flush previous input with previous parameters before changing */
620 if (strm->avail_in && gz_comp(state, Z_BLOCK5) == -1)
621 return state->err;
622 deflateParamsCr_z_deflateParams(strm, level, strategy);
623 }
624 state->level = level;
625 state->strategy = strategy;
626 return Z_OK0;
627}
628
629/* -- see zlib.h -- */
630int ZEXPORT gzclose_wCr_z_gzclose_w(file)
631 gzFileCr_z_gzFile file;
632{
633 int ret = Z_OK0;
634 gz_statep state;
635
636 /* get internal structure */
637 if (file == NULL((void*)0))
638 return Z_STREAM_ERROR(-2);
639 state = (gz_statep)file;
640
641 /* check that we're writing */
642 if (state->mode != GZ_WRITE31153)
643 return Z_STREAM_ERROR(-2);
644
645 /* check for seek request */
646 if (state->seek) {
647 state->seek = 0;
648 if (gz_zero(state, state->skip) == -1)
649 ret = state->err;
650 }
651
652 /* flush, free memory, and close file */
653 if (gz_comp(state, Z_FINISH4) == -1)
654 ret = state->err;
655 if (state->size) {
656 if (!state->direct) {
657 (void)deflateEndCr_z_deflateEnd(&(state->strm));
658 free(state->out);
659 }
660 free(state->in);
661 }
662 gz_errorCr_z_gz_error(state, Z_OK0, NULL((void*)0));
663 free(state->path);
664 if (close(state->fd) == -1)
665 ret = Z_ERRNO(-1);
666 free(state);
667 return ret;
668}