Bug Summary

File:out/../deps/v8/third_party/zlib/gzread.c
Warning:line 438, column 43
Division by zero

Annotated Source Code

Press '?' to see keyboard shortcuts

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 gzread.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/gzread.c
1/* gzread.c -- zlib functions for reading gzip files
2 * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013, 2016 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_load OF((gz_statep, unsigned char *, unsigned, unsigned *))(gz_statep, unsigned char *, unsigned, unsigned *);
10localstatic int gz_avail OF((gz_statep))(gz_statep);
11localstatic int gz_look OF((gz_statep))(gz_statep);
12localstatic int gz_decomp OF((gz_statep))(gz_statep);
13localstatic int gz_fetch OF((gz_statep))(gz_statep);
14localstatic int gz_skip OF((gz_statep, z_off64_t))(gz_statep, off_t);
15localstatic z_size_t gz_read OF((gz_statep, voidp, z_size_t))(gz_statep, Cr_z_voidp, z_size_t);
16
17/* Use read() to load a buffer -- return -1 on error, otherwise 0. Read from
18 state->fd, and update state->eof, state->err, and state->msg as appropriate.
19 This function needs to loop on read(), since read() is not guaranteed to
20 read the number of bytes requested, depending on the type of descriptor. */
21localstatic int gz_load(state, buf, len, have)
22 gz_statep state;
23 unsigned char *buf;
24 unsigned len;
25 unsigned *have;
26{
27 int ret;
28 unsigned get, max = ((unsigned)-1 >> 2) + 1;
29
30 *have = 0;
31 do {
32 get = len - *have;
33 if (get > max)
34 get = max;
35 ret = read(state->fd, buf + *have, get);
36 if (ret <= 0)
37 break;
38 *have += (unsigned)ret;
39 } while (*have < len);
40 if (ret < 0) {
41 gz_errorCr_z_gz_error(state, Z_ERRNO(-1), zstrerror()strerror((*__errno_location ())));
42 return -1;
43 }
44 if (ret == 0)
45 state->eof = 1;
46 return 0;
47}
48
49/* Load up input buffer and set eof flag if last data loaded -- return -1 on
50 error, 0 otherwise. Note that the eof flag is set when the end of the input
51 file is reached, even though there may be unused data in the buffer. Once
52 that data has been used, no more attempts will be made to read the file.
53 If strm->avail_in != 0, then the current data is moved to the beginning of
54 the input buffer, and then the remainder of the buffer is loaded with the
55 available data from the input file. */
56localstatic int gz_avail(state)
57 gz_statep state;
58{
59 unsigned got;
60 z_streamp strm = &(state->strm);
61
62 if (state->err != Z_OK0 && state->err != Z_BUF_ERROR(-5))
63 return -1;
64 if (state->eof == 0) {
65 if (strm->avail_in) { /* copy what's there to the start */
66 unsigned char *p = state->in;
67 unsigned const char *q = strm->next_in;
68 unsigned n = strm->avail_in;
69 do {
70 *p++ = *q++;
71 } while (--n);
72 }
73 if (gz_load(state, state->in + strm->avail_in,
74 state->size - strm->avail_in, &got) == -1)
75 return -1;
76 strm->avail_in += got;
77 strm->next_in = state->in;
78 }
79 return 0;
80}
81
82/* Look for gzip header, set up for inflate or copy. state->x.have must be 0.
83 If this is the first time in, allocate required memory. state->how will be
84 left unchanged if there is no more input data available, will be set to COPY
85 if there is no gzip header and direct copying will be performed, or it will
86 be set to GZIP for decompression. If direct copying, then leftover input
87 data from the input buffer will be copied to the output buffer. In that
88 case, all further file reads will be directly to either the output buffer or
89 a user buffer. If decompressing, the inflate state will be initialized.
90 gz_look() will return 0 on success or -1 on failure. */
91localstatic int gz_look(state)
92 gz_statep state;
93{
94 z_streamp strm = &(state->strm);
95
96 /* allocate read buffers and inflate memory */
97 if (state->size == 0) {
98 /* allocate buffers */
99 state->in = (unsigned char *)malloc(state->want);
100 state->out = (unsigned char *)malloc(state->want << 1);
101 if (state->in == NULL((void*)0) || state->out == NULL((void*)0)) {
102 free(state->out);
103 free(state->in);
104 gz_errorCr_z_gz_error(state, Z_MEM_ERROR(-4), "out of memory");
105 return -1;
106 }
107 state->size = state->want;
108
109 /* allocate inflate memory */
110 state->strm.zalloc = Z_NULL0;
111 state->strm.zfree = Z_NULL0;
112 state->strm.opaque = Z_NULL0;
113 state->strm.avail_in = 0;
114 state->strm.next_in = Z_NULL0;
115 if (inflateInit2(&(state->strm), 15 + 16)Cr_z_inflateInit2_((&(state->strm)), (15 + 16), "1.2.11"
, (int)sizeof(z_stream)) != Z_OK0) { /* gunzip */
116 free(state->out);
117 free(state->in);
118 state->size = 0;
119 gz_errorCr_z_gz_error(state, Z_MEM_ERROR(-4), "out of memory");
120 return -1;
121 }
122 }
123
124 /* get at least the magic bytes in the input buffer */
125 if (strm->avail_in < 2) {
126 if (gz_avail(state) == -1)
127 return -1;
128 if (strm->avail_in == 0)
129 return 0;
130 }
131
132 /* look for gzip magic bytes -- if there, do gzip decoding (note: there is
133 a logical dilemma here when considering the case of a partially written
134 gzip file, to wit, if a single 31 byte is written, then we cannot tell
135 whether this is a single-byte file, or just a partially written gzip
136 file -- for here we assume that if a gzip file is being written, then
137 the header will be written in a single operation, so that reading a
138 single byte is sufficient indication that it is not a gzip file) */
139 if (strm->avail_in > 1 &&
140 strm->next_in[0] == 31 && strm->next_in[1] == 139) {
141 inflateResetCr_z_inflateReset(strm);
142 state->how = GZIP2;
143 state->direct = 0;
144 return 0;
145 }
146
147 /* no gzip header -- if we were decoding gzip before, then this is trailing
148 garbage. Ignore the trailing garbage and finish. */
149 if (state->direct == 0) {
150 strm->avail_in = 0;
151 state->eof = 1;
152 state->x.have = 0;
153 return 0;
154 }
155
156 /* doing raw i/o, copy any leftover input to output -- this assumes that
157 the output buffer is larger than the input buffer, which also assures
158 space for gzungetc() */
159 state->x.next = state->out;
160 if (strm->avail_in) {
161 memcpy(state->x.next, strm->next_in, strm->avail_in);
162 state->x.have = strm->avail_in;
163 strm->avail_in = 0;
164 }
165 state->how = COPY1;
166 state->direct = 1;
167 return 0;
168}
169
170/* Decompress from input to the provided next_out and avail_out in the state.
171 On return, state->x.have and state->x.next point to the just decompressed
172 data. If the gzip stream completes, state->how is reset to LOOK to look for
173 the next gzip stream or raw data, once state->x.have is depleted. Returns 0
174 on success, -1 on failure. */
175localstatic int gz_decomp(state)
176 gz_statep state;
177{
178 int ret = Z_OK0;
179 unsigned had;
180 z_streamp strm = &(state->strm);
181
182 /* fill output buffer up to end of deflate stream */
183 had = strm->avail_out;
184 do {
185 /* get more input for inflate() */
186 if (strm->avail_in == 0 && gz_avail(state) == -1)
187 return -1;
188 if (strm->avail_in == 0) {
189 gz_errorCr_z_gz_error(state, Z_BUF_ERROR(-5), "unexpected end of file");
190 break;
191 }
192
193 /* decompress and handle errors */
194 ret = inflateCr_z_inflate(strm, Z_NO_FLUSH0);
195 if (ret == Z_STREAM_ERROR(-2) || ret == Z_NEED_DICT2) {
196 gz_errorCr_z_gz_error(state, Z_STREAM_ERROR(-2),
197 "internal error: inflate stream corrupt");
198 return -1;
199 }
200 if (ret == Z_MEM_ERROR(-4)) {
201 gz_errorCr_z_gz_error(state, Z_MEM_ERROR(-4), "out of memory");
202 return -1;
203 }
204 if (ret == Z_DATA_ERROR(-3)) { /* deflate stream invalid */
205 gz_errorCr_z_gz_error(state, Z_DATA_ERROR(-3),
206 strm->msg == NULL((void*)0) ? "compressed data error" : strm->msg);
207 return -1;
208 }
209 } while (strm->avail_out && ret != Z_STREAM_END1);
210
211 /* update available output */
212 state->x.have = had - strm->avail_out;
213 state->x.next = strm->next_out - state->x.have;
214
215 /* if the gzip stream completed successfully, look for another */
216 if (ret == Z_STREAM_END1)
217 state->how = LOOK0;
218
219 /* good decompression */
220 return 0;
221}
222
223/* Fetch data and put it in the output buffer. Assumes state->x.have is 0.
224 Data is either copied from the input file or decompressed from the input
225 file depending on state->how. If state->how is LOOK, then a gzip header is
226 looked for to determine whether to copy or decompress. Returns -1 on error,
227 otherwise 0. gz_fetch() will leave state->how as COPY or GZIP unless the
228 end of the input file has been reached and all data has been processed. */
229localstatic int gz_fetch(state)
230 gz_statep state;
231{
232 z_streamp strm = &(state->strm);
233
234 do {
235 switch(state->how) {
236 case LOOK0: /* -> LOOK, COPY (only if never GZIP), or GZIP */
237 if (gz_look(state) == -1)
238 return -1;
239 if (state->how == LOOK0)
240 return 0;
241 break;
242 case COPY1: /* -> COPY */
243 if (gz_load(state, state->out, state->size << 1, &(state->x.have))
244 == -1)
245 return -1;
246 state->x.next = state->out;
247 return 0;
248 case GZIP2: /* -> GZIP or LOOK (if end of gzip stream) */
249 strm->avail_out = state->size << 1;
250 strm->next_out = state->out;
251 if (gz_decomp(state) == -1)
252 return -1;
253 }
254 } while (state->x.have == 0 && (!state->eof || strm->avail_in));
255 return 0;
256}
257
258/* Skip len uncompressed bytes of output. Return -1 on error, 0 on success. */
259localstatic int gz_skip(state, len)
260 gz_statep state;
261 z_off64_toff_t len;
262{
263 unsigned n;
264
265 /* skip over len bytes or reach end-of-file, whichever comes first */
266 while (len)
267 /* skip over whatever is in output buffer */
268 if (state->x.have) {
269 n = GT_OFF(state->x.have)(sizeof(int) == sizeof(off_t) && (state->x.have) >
2147483647) || (z_off64_toff_t)state->x.have > len ?
270 (unsigned)len : state->x.have;
271 state->x.have -= n;
272 state->x.next += n;
273 state->x.pos += n;
274 len -= n;
275 }
276
277 /* output buffer empty -- return if we're at the end of the input */
278 else if (state->eof && state->strm.avail_in == 0)
279 break;
280
281 /* need more data to skip -- load up output buffer */
282 else {
283 /* get more output, looking for header if required */
284 if (gz_fetch(state) == -1)
285 return -1;
286 }
287 return 0;
288}
289
290/* Read len bytes into buf from file, or less than len up to the end of the
291 input. Return the number of bytes read. If zero is returned, either the
292 end of file was reached, or there was an error. state->err must be
293 consulted in that case to determine which. */
294localstatic z_size_t gz_read(state, buf, len)
295 gz_statep state;
296 voidpCr_z_voidp buf;
297 z_size_t len;
298{
299 z_size_t got;
300 unsigned n;
301
302 /* if len is zero, avoid unnecessary operations */
303 if (len == 0)
304 return 0;
305
306 /* process a skip request */
307 if (state->seek) {
308 state->seek = 0;
309 if (gz_skip(state, state->skip) == -1)
310 return 0;
311 }
312
313 /* get len bytes to buf, or less than len if at the end */
314 got = 0;
315 do {
316 /* set n to the maximum amount of len that fits in an unsigned int */
317 n = (unsigned)-1;
318 if (n > len)
319 n = (unsigned)len;
320
321 /* first just try copying data from the output buffer */
322 if (state->x.have) {
323 if (state->x.have < n)
324 n = state->x.have;
325 memcpy(buf, state->x.next, n);
326 state->x.next += n;
327 state->x.have -= n;
328 }
329
330 /* output buffer empty -- return if we're at the end of the input */
331 else if (state->eof && state->strm.avail_in == 0) {
332 state->past = 1; /* tried to read past end */
333 break;
334 }
335
336 /* need output data -- for small len or new stream load up our output
337 buffer */
338 else if (state->how == LOOK0 || n < (state->size << 1)) {
339 /* get more output, looking for header if required */
340 if (gz_fetch(state) == -1)
341 return 0;
342 continue; /* no progress yet -- go back to copy above */
343 /* the copy above assures that we will leave with space in the
344 output buffer, allowing at least one gzungetc() to succeed */
345 }
346
347 /* large len -- read directly into user buffer */
348 else if (state->how == COPY1) { /* read directly */
349 if (gz_load(state, (unsigned char *)buf, n, &n) == -1)
350 return 0;
351 }
352
353 /* large len -- decompress directly into user buffer */
354 else { /* state->how == GZIP */
355 state->strm.avail_out = n;
356 state->strm.next_out = (unsigned char *)buf;
357 if (gz_decomp(state) == -1)
358 return 0;
359 n = state->x.have;
360 state->x.have = 0;
361 }
362
363 /* update progress */
364 len -= n;
365 buf = (char *)buf + n;
366 got += n;
367 state->x.pos += n;
368 } while (len);
369
370 /* return number of bytes read into user buffer */
371 return got;
372}
373
374/* -- see zlib.h -- */
375int ZEXPORT gzreadCr_z_gzread(file, buf, len)
376 gzFileCr_z_gzFile file;
377 voidpCr_z_voidp buf;
378 unsigned len;
379{
380 gz_statep state;
381
382 /* get internal structure */
383 if (file == NULL((void*)0))
384 return -1;
385 state = (gz_statep)file;
386
387 /* check that we're reading and that there's no (serious) error */
388 if (state->mode != GZ_READ7247 ||
389 (state->err != Z_OK0 && state->err != Z_BUF_ERROR(-5)))
390 return -1;
391
392 /* since an int is returned, make sure len fits in one, otherwise return
393 with an error (this avoids a flaw in the interface) */
394 if ((int)len < 0) {
395 gz_errorCr_z_gz_error(state, Z_STREAM_ERROR(-2), "request does not fit in an int");
396 return -1;
397 }
398
399 /* read len or fewer bytes to buf */
400 len = (unsigned)gz_read(state, buf, len);
401
402 /* check for an error */
403 if (len == 0 && state->err != Z_OK0 && state->err != Z_BUF_ERROR(-5))
404 return -1;
405
406 /* return the number of bytes read (this is assured to fit in an int) */
407 return (int)len;
408}
409
410/* -- see zlib.h -- */
411z_size_t ZEXPORT gzfreadCr_z_gzfread(buf, size, nitems, file)
412 voidpCr_z_voidp buf;
413 z_size_t size;
414 z_size_t nitems;
415 gzFileCr_z_gzFile file;
416{
417 z_size_t len;
418 gz_statep state;
419
420 /* get internal structure */
421 if (file == NULL((void*)0))
1
Assuming 'file' is not equal to NULL
→
2
←
Taking false branch
→
422 return 0;
423 state = (gz_statep)file;
424
425 /* check that we're reading and that there's no (serious) error */
426 if (state->mode != GZ_READ7247 ||
3
←
Assuming field 'mode' is equal to GZ_READ
→
427 (state->err != Z_OK0 && state->err != Z_BUF_ERROR(-5)))
4
←
Assuming field 'err' is equal to Z_OK
→
428 return 0;
429
430 /* compute bytes to read -- error on overflow */
431 len = nitems * size;
432 if (size && len / size != nitems) {
5
←
Assuming 'size' is 0
→
433 gz_errorCr_z_gz_error(state, Z_STREAM_ERROR(-2), "request does not fit in a size_t");
434 return 0;
435 }
436
437 /* read len or fewer bytes to buf, return the number of full items read */
438 return len ? gz_read(state, buf, len) / size : 0;
6
←
Assuming 'len' is not equal to 0
→
7
←
'?' condition is true
→
8
←
Division by zero
439}
440
441/* -- see zlib.h -- */
442#ifdef Z_PREFIX_SET
443# undef z_gzgetc
444#else
445# undef gzgetcCr_z_gzgetc
446# ifdef Z_CR_PREFIX_SET
447# define gzgetcCr_z_gzgetc Cr_z_gzgetc
448# endif
449#endif
450
451int ZEXPORT gzgetcCr_z_gzgetc(file)
452 gzFileCr_z_gzFile file;
453{
454 unsigned char buf[1];
455 gz_statep state;
456
457 /* get internal structure */
458 if (file == NULL((void*)0))
459 return -1;
460 state = (gz_statep)file;
461
462 /* check that we're reading and that there's no (serious) error */
463 if (state->mode != GZ_READ7247 ||
464 (state->err != Z_OK0 && state->err != Z_BUF_ERROR(-5)))
465 return -1;
466
467 /* try output buffer (no need to check for skip request) */
468 if (state->x.have) {
469 state->x.have--;
470 state->x.pos++;
471 return *(state->x.next)++;
472 }
473
474 /* nothing there -- try gz_read() */
475 return gz_read(state, buf, 1) < 1 ? -1 : buf[0];
476}
477
478int ZEXPORT gzgetc_Cr_z_gzgetc_(file)
479gzFileCr_z_gzFile file;
480{
481 return gzgetcCr_z_gzgetc(file);
482}
483
484/* -- see zlib.h -- */
485int ZEXPORT gzungetcCr_z_gzungetc(c, file)
486 int c;
487 gzFileCr_z_gzFile file;
488{
489 gz_statep state;
490
491 /* get internal structure */
492 if (file == NULL((void*)0))
493 return -1;
494 state = (gz_statep)file;
495
496 /* check that we're reading and that there's no (serious) error */
497 if (state->mode != GZ_READ7247 ||
498 (state->err != Z_OK0 && state->err != Z_BUF_ERROR(-5)))
499 return -1;
500
501 /* process a skip request */
502 if (state->seek) {
503 state->seek = 0;
504 if (gz_skip(state, state->skip) == -1)
505 return -1;
506 }
507
508 /* can't push EOF */
509 if (c < 0)
510 return -1;
511
512 /* if output buffer empty, put byte at end (allows more pushing) */
513 if (state->x.have == 0) {
514 state->x.have = 1;
515 state->x.next = state->out + (state->size << 1) - 1;
516 state->x.next[0] = (unsigned char)c;
517 state->x.pos--;
518 state->past = 0;
519 return c;
520 }
521
522 /* if no room, give up (must have already done a gzungetc()) */
523 if (state->x.have == (state->size << 1)) {
524 gz_errorCr_z_gz_error(state, Z_DATA_ERROR(-3), "out of room to push characters");
525 return -1;
526 }
527
528 /* slide output data if needed and insert byte before existing data */
529 if (state->x.next == state->out) {
530 unsigned char *src = state->out + state->x.have;
531 unsigned char *dest = state->out + (state->size << 1);
532 while (src > state->out)
533 *--dest = *--src;
534 state->x.next = dest;
535 }
536 state->x.have++;
537 state->x.next--;
538 state->x.next[0] = (unsigned char)c;
539 state->x.pos--;
540 state->past = 0;
541 return c;
542}
543
544/* -- see zlib.h -- */
545char * ZEXPORT gzgetsCr_z_gzgets(file, buf, len)
546 gzFileCr_z_gzFile file;
547 char *buf;
548 int len;
549{
550 unsigned left, n;
551 char *str;
552 unsigned char *eol;
553 gz_statep state;
554
555 /* check parameters and get internal structure */
556 if (file == NULL((void*)0) || buf == NULL((void*)0) || len < 1)
557 return NULL((void*)0);
558 state = (gz_statep)file;
559
560 /* check that we're reading and that there's no (serious) error */
561 if (state->mode != GZ_READ7247 ||
562 (state->err != Z_OK0 && state->err != Z_BUF_ERROR(-5)))
563 return NULL((void*)0);
564
565 /* process a skip request */
566 if (state->seek) {
567 state->seek = 0;
568 if (gz_skip(state, state->skip) == -1)
569 return NULL((void*)0);
570 }
571
572 /* copy output bytes up to new line or len - 1, whichever comes first --
573 append a terminating zero to the string (we don't check for a zero in
574 the contents, let the user worry about that) */
575 str = buf;
576 left = (unsigned)len - 1;
577 if (left) do {
578 /* assure that something is in the output buffer */
579 if (state->x.have == 0 && gz_fetch(state) == -1)
580 return NULL((void*)0); /* error */
581 if (state->x.have == 0) { /* end of file */
582 state->past = 1; /* read past end */
583 break; /* return what we have */
584 }
585
586 /* look for end-of-line in current output buffer */
587 n = state->x.have > left ? left : state->x.have;
588 eol = (unsigned char *)memchr(state->x.next, '\n', n);
589 if (eol != NULL((void*)0))
590 n = (unsigned)(eol - state->x.next) + 1;
591
592 /* copy through end-of-line, or remainder if not found */
593 memcpy(buf, state->x.next, n);
594 state->x.have -= n;
595 state->x.next += n;
596 state->x.pos += n;
597 left -= n;
598 buf += n;
599 } while (left && eol == NULL((void*)0));
600
601 /* return terminated string, or if nothing, end of file */
602 if (buf == str)
603 return NULL((void*)0);
604 buf[0] = 0;
605 return str;
606}
607
608/* -- see zlib.h -- */
609int ZEXPORT gzdirectCr_z_gzdirect(file)
610 gzFileCr_z_gzFile file;
611{
612 gz_statep state;
613
614 /* get internal structure */
615 if (file == NULL((void*)0))
616 return 0;
617 state = (gz_statep)file;
618
619 /* if the state is not known, but we can find out, then do so (this is
620 mainly for right after a gzopen() or gzdopen()) */
621 if (state->mode == GZ_READ7247 && state->how == LOOK0 && state->x.have == 0)
622 (void)gz_look(state);
623
624 /* return 1 if transparent, 0 if processing a gzip stream */
625 return state->direct;
626}
627
628/* -- see zlib.h -- */
629int ZEXPORT gzclose_rCr_z_gzclose_r(file)
630 gzFileCr_z_gzFile file;
631{
632 int ret, err;
633 gz_statep state;
634
635 /* get internal structure */
636 if (file == NULL((void*)0))
637 return Z_STREAM_ERROR(-2);
638 state = (gz_statep)file;
639
640 /* check that we're reading */
641 if (state->mode != GZ_READ7247)
642 return Z_STREAM_ERROR(-2);
643
644 /* free memory and close file */
645 if (state->size) {
646 inflateEndCr_z_inflateEnd(&(state->strm));
647 free(state->out);
648 free(state->in);
649 }
650 err = state->err == Z_BUF_ERROR(-5) ? Z_BUF_ERROR(-5) : Z_OK0;
651 gz_errorCr_z_gz_error(state, Z_OK0, NULL((void*)0));
652 free(state->path);
653 ret = close(state->fd);
654 free(state);
655 return ret ? Z_ERRNO(-1) : err;
656}