Bug Summary

File:/home/joel/rtems-4.11-work/build/rtems/c/src/../../cpukit/zlib/gzwrite.c
Location:line 52, column 5
Description:Allocated memory never released. Potential memory leak

Annotated Source Code

1/* gzwrite.c -- zlib functions for writing gzip files
2 * Copyright (C) 2004, 2005, 2010 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);
12
13/* Initialize state for writing a gzip file. Mark initialization by setting
14 state->size to non-zero. Return -1 on failure or 0 on success. */
15localstatic int gz_init(state)
16 gz_statep state;
17{
18 int ret;
19 z_streamp strm = &(state->strm);
20
21 /* allocate input and output buffers */
22 state->in = malloc(state->want);
23 state->out = malloc(state->want);
24 if (state->in == NULL((void*)0) || state->out == NULL((void*)0)) {
1
Taking false branch
25 if (state->out != NULL((void*)0))
26 free(state->out);
27 if (state->in != NULL((void*)0))
28 free(state->in);
29 gz_errorz_gz_error(state, Z_MEM_ERROR(-4), "out of memory");
30 return -1;
31 }
32
33 /* allocate deflate memory, set up for gzip compression */
34 strm->zalloc = Z_NULL0;
35 strm->zfree = Z_NULL0;
36 strm->opaque = Z_NULL0;
37 ret = deflateInit2(strm, state->level, Z_DEFLATED,z_deflateInit2_((strm),(state->level),(8),(15 + 16),(8), (
state->strategy), "1.2.4", sizeof(z_stream))
38 15 + 16, 8, state->strategy)z_deflateInit2_((strm),(state->level),(8),(15 + 16),(8), (
state->strategy), "1.2.4", sizeof(z_stream));
39 if (ret != Z_OK0) {
2
Taking false branch
40 free(state->in);
41 gz_errorz_gz_error(state, Z_MEM_ERROR(-4), "out of memory");
42 return -1;
43 }
44
45 /* mark state as initialized */
46 state->size = state->want;
47
48 /* initialize write buffer */
49 strm->avail_out = state->size;
50 strm->next_out = state->out;
51 state->next = strm->next_out;
52 return 0;
3
Allocated memory never released. Potential memory leak
53}
54
55/* Compress whatever is at avail_in and next_in and write to the output file.
56 Return -1 if there is an error writing to the output file, otherwise 0.
57 flush is assumed to be a valid deflate() flush value. If flush is Z_FINISH,
58 then the deflate() state is reset to start a new gzip stream. */
59localstatic int gz_comp(state, flush)
60 gz_statep state;
61 int flush;
62{
63 int ret, got;
64 unsigned have;
65 z_streamp strm = &(state->strm);
66
67 /* allocate memory if this is the first time through */
68 if (state->size == 0 && gz_init(state) == -1)
69 return -1;
70
71 /* run deflate() on provided input until it produces no more output */
72 ret = Z_OK0;
73 do {
74 /* write out current buffer contents if full, or if flushing, but if
75 doing Z_FINISH then don't write until we get to Z_STREAM_END */
76 if (strm->avail_out == 0 || (flush != Z_NO_FLUSH0 &&
77 (flush != Z_FINISH4 || ret == Z_STREAM_END1))) {
78 have = (unsigned)(strm->next_out - state->next);
79 if (have && ((got = write(state->fd, state->next, have)) < 0 ||
80 (unsigned)got != have)) {
81 gz_errorz_gz_error(state, Z_ERRNO(-1), zstrerror()strerror((*__errno_location ())));
82 return -1;
83 }
84 if (strm->avail_out == 0) {
85 strm->avail_out = state->size;
86 strm->next_out = state->out;
87 }
88 state->next = strm->next_out;
89 }
90
91 /* compress */
92 have = strm->avail_out;
93 ret = deflatez_deflate(strm, flush);
94 if (ret == Z_STREAM_ERROR(-2)) {
95 gz_errorz_gz_error(state, Z_STREAM_ERROR(-2),
96 "internal error: deflate stream corrupt");
97 return -1;
98 }
99 have -= strm->avail_out;
100 } while (have);
101
102 /* if that completed a deflate stream, allow another to start */
103 if (flush == Z_FINISH4)
104 deflateResetz_deflateReset(strm);
105
106 /* all done, no errors */
107 return 0;
108}
109
110/* Compress len zeros to output. Return -1 on error, 0 on success. */
111localstatic int gz_zero(state, len)
112 gz_statep state;
113 z_off64_toff_t len;
114{
115 int first;
116 unsigned n;
117 z_streamp strm = &(state->strm);
118
119 /* consume whatever's left in the input buffer */
120 if (strm->avail_in && gz_comp(state, Z_NO_FLUSH0) == -1)
121 return -1;
122
123 /* compress len zeros (len guaranteed > 0) */
124 first = 1;
125 while (len) {
126 n = GT_OFF(state->size)(sizeof(int) == sizeof(off_t) && (state->size) >
2147483647) || (z_off64_toff_t)state->size > len ?
127 (unsigned)len : state->size;
128 if (first) {
129 memset(state->in, 0, n);
130 first = 0;
131 }
132 strm->avail_in = n;
133 strm->next_in = state->in;
134 state->pos += n;
135 if (gz_comp(state, Z_NO_FLUSH0) == -1)
136 return -1;
137 len -= n;
138 }
139 return 0;
140}
141
142/* -- see zlib.h -- */
143int ZEXPORT gzwritez_gzwrite(file, buf, len)
144 gzFilez_gzFile file;
145 voidpcz_voidpc buf;
146 unsigned len;
147{
148 unsigned put = len;
149 unsigned n;
150 gz_statep state;
151 z_streamp strm;
152
153 /* get internal structure */
154 if (file == NULL((void*)0))
155 return 0;
156 state = (gz_statep)file;
157 strm = &(state->strm);
158
159 /* check that we're writing and that there's no error */
160 if (state->mode != GZ_WRITE31153 || state->err != Z_OK0)
161 return 0;
162
163 /* since an int is returned, make sure len fits in one, otherwise return
164 with an error (this avoids the flaw in the interface) */
165 if ((int)len < 0) {
166 gz_errorz_gz_error(state, Z_BUF_ERROR(-5), "requested length does not fit in int");
167 return 0;
168 }
169
170 /* if len is zero, avoid unnecessary operations */
171 if (len == 0)
172 return 0;
173
174 /* allocate memory if this is the first time through */
175 if (state->size == 0 && gz_init(state) == -1)
176 return 0;
177
178 /* check for seek request */
179 if (state->seek) {
180 state->seek = 0;
181 if (gz_zero(state, state->skip) == -1)
182 return 0;
183 }
184
185 /* for small len, copy to input buffer, otherwise compress directly */
186 if (len < state->size) {
187 /* copy to input buffer, compress when full */
188 do {
189 if (strm->avail_in == 0)
190 strm->next_in = state->in;
191 n = state->size - strm->avail_in;
192 if (n > len)
193 n = len;
194 memcpy(strm->next_in + strm->avail_in, buf, n);
195 strm->avail_in += n;
196 state->pos += n;
197 buf = (char *)buf + n;
198 len -= n;
199 if (len && gz_comp(state, Z_NO_FLUSH0) == -1)
200 return 0;
201 } while (len);
202 }
203 else {
204 /* consume whatever's left in the input buffer */
205 if (strm->avail_in && gz_comp(state, Z_NO_FLUSH0) == -1)
206 return 0;
207
208 /* directly compress user buffer to file */
209 strm->avail_in = len;
210 strm->next_in = (voidpz_voidp)buf;
211 state->pos += len;
212 if (gz_comp(state, Z_NO_FLUSH0) == -1)
213 return 0;
214 }
215
216 /* input was all buffered or compressed (put will fit in int) */
217 return (int)put;
218}
219
220/* -- see zlib.h -- */
221int ZEXPORT gzputcz_gzputc(file, c)
222 gzFilez_gzFile file;
223 int c;
224{
225 unsigned char buf[1];
226 gz_statep state;
227 z_streamp strm;
228
229 /* get internal structure */
230 if (file == NULL((void*)0))
231 return -1;
232 state = (gz_statep)file;
233 strm = &(state->strm);
234
235 /* check that we're writing and that there's no error */
236 if (state->mode != GZ_WRITE31153 || state->err != Z_OK0)
237 return -1;
238
239 /* check for seek request */
240 if (state->seek) {
241 state->seek = 0;
242 if (gz_zero(state, state->skip) == -1)
243 return -1;
244 }
245
246 /* try writing to input buffer for speed (state->size == 0 if buffer not
247 initialized) */
248 if (strm->avail_in < state->size) {
249 if (strm->avail_in == 0)
250 strm->next_in = state->in;
251 strm->next_in[strm->avail_in++] = c;
252 state->pos++;
253 return c;
254 }
255
256 /* no room in buffer or not initialized, use gz_write() */
257 buf[0] = c;
258 if (gzwritez_gzwrite(file, buf, 1) != 1)
259 return -1;
260 return c;
261}
262
263/* -- see zlib.h -- */
264int ZEXPORT gzputsz_gzputs(file, str)
265 gzFilez_gzFile file;
266 const char *str;
267{
268 int ret;
269 unsigned len;
270
271 /* write string */
272 len = (unsigned)strlen(str);
273 ret = gzwritez_gzwrite(file, str, len);
274 return ret == 0 && len != 0 ? -1 : ret;
275}
276
277#ifdef STDC
278#include <stdarg.h>
279
280/* -- see zlib.h -- */
281int ZEXPORTVA gzprintfz_gzprintf (gzFilez_gzFile file, const char *format, ...)
282{
283 int size, len;
284 gz_statep state;
285 z_streamp strm;
286 va_list va;
287
288 /* get internal structure */
289 if (file == NULL((void*)0))
290 return -1;
291 state = (gz_statep)file;
292 strm = &(state->strm);
293
294 /* check that we're writing and that there's no error */
295 if (state->mode != GZ_WRITE31153 || state->err != Z_OK0)
296 return 0;
297
298 /* make sure we have some buffer space */
299 if (state->size == 0 && gz_init(state) == -1)
300 return 0;
301
302 /* check for seek request */
303 if (state->seek) {
304 state->seek = 0;
305 if (gz_zero(state, state->skip) == -1)
306 return 0;
307 }
308
309 /* consume whatever's left in the input buffer */
310 if (strm->avail_in && gz_comp(state, Z_NO_FLUSH0) == -1)
311 return 0;
312
313 /* do the printf() into the input buffer, put length in len */
314 size = (int)(state->size);
315 state->in[size - 1] = 0;
316 va_start(va, format)__builtin_va_start(va, format);
317#ifdef NO_vsnprintf
318# ifdef HAS_vsprintf_void
319 (void)vsprintf(state->in, format, va);
320 va_end(va)__builtin_va_end(va);
321 for (len = 0; len < size; len++)
322 if (state->in[len] == 0) break;
323# else
324 len = vsprintf(state->in, format, va);
325 va_end(va)__builtin_va_end(va);
326# endif
327#else
328# ifdef HAS_vsnprintf_void
329 (void)vsnprintf(state->in, size, format, va);
330 va_end(va)__builtin_va_end(va);
331 len = strlen(state->in);
332# else
333 len = vsnprintf((char *)(state->in), size, format, va);
334 va_end(va)__builtin_va_end(va);
335# endif
336#endif
337
338 /* check that printf() results fit in buffer */
339 if (len <= 0 || len >= (int)size || state->in[size - 1] != 0)
340 return 0;
341
342 /* update buffer and position, defer compression until needed */
343 strm->avail_in = (unsigned)len;
344 strm->next_in = state->in;
345 state->pos += len;
346 return len;
347}
348
349#else /* !STDC */
350
351/* -- see zlib.h -- */
352int ZEXPORTVA gzprintfz_gzprintf (file, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
353 a11, a12, a13, a14, a15, a16, a17, a18, a19, a20)
354 gzFilez_gzFile file;
355 const char *format;
356 int a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
357 a11, a12, a13, a14, a15, a16, a17, a18, a19, a20;
358{
359 int size, len;
360 gz_statep state;
361 z_streamp strm;
362
363 /* get internal structure */
364 if (file == NULL((void*)0))
365 return -1;
366 state = (gz_statep)file;
367 strm = &(state->strm);
368
369 /* check that we're writing and that there's no error */
370 if (state->mode != GZ_WRITE31153 || state->err != Z_OK0)
371 return 0;
372
373 /* make sure we have some buffer space */
374 if (state->size == 0 && gz_init(state) == -1)
375 return 0;
376
377 /* check for seek request */
378 if (state->seek) {
379 state->seek = 0;
380 if (gz_zero(state, state->skip) == -1)
381 return 0;
382 }
383
384 /* consume whatever's left in the input buffer */
385 if (strm->avail_in && gz_comp(state, Z_NO_FLUSH0) == -1)
386 return 0;
387
388 /* do the printf() into the input buffer, put length in len */
389 size = (int)(state->size);
390 state->in[size - 1] = 0;
391#ifdef NO_snprintf
392# ifdef HAS_sprintf_void
393 sprintf(state->in, format, a1, a2, a3, a4, a5, a6, a7, a8,
394 a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
395 for (len = 0; len < size; len++)
396 if (state->in[len] == 0) break;
397# else
398 len = sprintf(state->in, format, a1, a2, a3, a4, a5, a6, a7, a8,
399 a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
400# endif
401#else
402# ifdef HAS_snprintf_void
403 snprintf(state->in, size, format, a1, a2, a3, a4, a5, a6, a7, a8,
404 a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
405 len = strlen(state->in);
406# else
407 len = snprintf(state->in, size, format, a1, a2, a3, a4, a5, a6, a7, a8,
408 a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
409# endif
410#endif
411
412 /* check that printf() results fit in buffer */
413 if (len <= 0 || len >= (int)size || state->in[size - 1] != 0)
414 return 0;
415
416 /* update buffer and position, defer compression until needed */
417 strm->avail_in = (unsigned)len;
418 strm->next_in = state->in;
419 state->pos += len;
420 return len;
421}
422
423#endif
424
425/* -- see zlib.h -- */
426int ZEXPORT gzflushz_gzflush(file, flush)
427 gzFilez_gzFile file;
428 int flush;
429{
430 gz_statep state;
431
432 /* get internal structure */
433 if (file == NULL((void*)0))
434 return -1;
435 state = (gz_statep)file;
436
437 /* check that we're writing and that there's no error */
438 if (state->mode != GZ_WRITE31153 || state->err != Z_OK0)
439 return Z_STREAM_ERROR(-2);
440
441 /* check flush parameter */
442 if (flush < 0 || flush > Z_FINISH4)
443 return Z_STREAM_ERROR(-2);
444
445 /* check for seek request */
446 if (state->seek) {
447 state->seek = 0;
448 if (gz_zero(state, state->skip) == -1)
449 return -1;
450 }
451
452 /* compress remaining data with requested flush */
453 gz_comp(state, flush);
454 return state->err;
455}
456
457/* -- see zlib.h -- */
458int ZEXPORT gzsetparamsz_gzsetparams(file, level, strategy)
459 gzFilez_gzFile file;
460 int level;
461 int strategy;
462{
463 gz_statep state;
464 z_streamp strm;
465
466 /* get internal structure */
467 if (file == NULL((void*)0))
468 return Z_STREAM_ERROR(-2);
469 state = (gz_statep)file;
470 strm = &(state->strm);
471
472 /* check that we're writing and that there's no error */
473 if (state->mode != GZ_WRITE31153 || state->err != Z_OK0)
474 return Z_STREAM_ERROR(-2);
475
476 /* if no change is requested, then do nothing */
477 if (level == state->level && strategy == state->strategy)
478 return Z_OK0;
479
480 /* check for seek request */
481 if (state->seek) {
482 state->seek = 0;
483 if (gz_zero(state, state->skip) == -1)
484 return -1;
485 }
486
487 /* change compression parameters for subsequent input */
488 if (state->size) {
489 /* flush previous input with previous parameters before changing */
490 if (strm->avail_in && gz_comp(state, Z_PARTIAL_FLUSH1) == -1)
491 return state->err;
492 deflateParamsz_deflateParams(strm, level, strategy);
493 }
494 state->level = level;
495 state->strategy = strategy;
496 return Z_OK0;
497}
498
499/* -- see zlib.h -- */
500int ZEXPORT gzclose_wz_gzclose_w(file)
501 gzFilez_gzFile file;
502{
503 int ret = 0;
504 gz_statep state;
505
506 /* get internal structure */
507 if (file == NULL((void*)0))
508 return Z_STREAM_ERROR(-2);
509 state = (gz_statep)file;
510
511 /* check that we're writing */
512 if (state->mode != GZ_WRITE31153)
513 return Z_STREAM_ERROR(-2);
514
515 /* check for seek request */
516 if (state->seek) {
517 state->seek = 0;
518 ret += gz_zero(state, state->skip);
519 }
520
521 /* flush, free memory, and close file */
522 ret += gz_comp(state, Z_FINISH4);
523 (void)deflateEndz_deflateEnd(&(state->strm));
524 free(state->out);
525 free(state->in);
526 gz_errorz_gz_error(state, Z_OK0, NULL((void*)0));
527 free(state->path);
528 ret += close(state->fd);
529 free(state);
530 return ret ? Z_ERRNO(-1) : Z_OK0;
531}