FFmpeg  1.2.12
mem.h
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1 /*
2  * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
26 #ifndef AVUTIL_MEM_H
27 #define AVUTIL_MEM_H
28 
29 #include <limits.h>
30 #include <stdint.h>
31 
32 #include "attributes.h"
33 #include "error.h"
34 #include "avutil.h"
35 
42 #if defined(__INTEL_COMPILER) && __INTEL_COMPILER < 1110 || defined(__SUNPRO_C)
43  #define DECLARE_ALIGNED(n,t,v) t __attribute__ ((aligned (n))) v
44  #define DECLARE_ASM_CONST(n,t,v) const t __attribute__ ((aligned (n))) v
45 #elif defined(__TI_COMPILER_VERSION__)
46  #define DECLARE_ALIGNED(n,t,v) \
47  AV_PRAGMA(DATA_ALIGN(v,n)) \
48  t __attribute__((aligned(n))) v
49  #define DECLARE_ASM_CONST(n,t,v) \
50  AV_PRAGMA(DATA_ALIGN(v,n)) \
51  static const t __attribute__((aligned(n))) v
52 #elif defined(__GNUC__)
53  #define DECLARE_ALIGNED(n,t,v) t __attribute__ ((aligned (n))) v
54  #define DECLARE_ASM_CONST(n,t,v) static const t av_used __attribute__ ((aligned (n))) v
55 #elif defined(_MSC_VER)
56  #define DECLARE_ALIGNED(n,t,v) __declspec(align(n)) t v
57  #define DECLARE_ASM_CONST(n,t,v) __declspec(align(n)) static const t v
58 #else
59  #define DECLARE_ALIGNED(n,t,v) t v
60  #define DECLARE_ASM_CONST(n,t,v) static const t v
61 #endif
62 
63 #if AV_GCC_VERSION_AT_LEAST(3,1)
64  #define av_malloc_attrib __attribute__((__malloc__))
65 #else
66  #define av_malloc_attrib
67 #endif
68 
69 #if AV_GCC_VERSION_AT_LEAST(4,3)
70  #define av_alloc_size(...) __attribute__((alloc_size(__VA_ARGS__)))
71 #else
72  #define av_alloc_size(...)
73 #endif
74 
84 
94 av_alloc_size(1, 2) static inline void *av_malloc_array(size_t nmemb, size_t size)
95 {
96  if (size <= 0 || nmemb >= INT_MAX / size)
97  return NULL;
98  return av_malloc(nmemb * size);
99 }
100 
113 void *av_realloc(void *ptr, size_t size) av_alloc_size(2);
114 
123 void *av_realloc_f(void *ptr, size_t nelem, size_t elsize);
124 
133 void av_free(void *ptr);
134 
144 
155 void *av_calloc(size_t nmemb, size_t size) av_malloc_attrib;
156 
167 av_alloc_size(1, 2) static inline void *av_mallocz_array(size_t nmemb, size_t size)
168 {
169  if (size <= 0 || nmemb >= INT_MAX / size)
170  return NULL;
171  return av_mallocz(nmemb * size);
172 }
173 
180 char *av_strdup(const char *s) av_malloc_attrib;
181 
189 void av_freep(void *ptr);
190 
198 void av_dynarray_add(void *tab_ptr, int *nb_ptr, void *elem);
199 
204 static inline int av_size_mult(size_t a, size_t b, size_t *r)
205 {
206  size_t t = a * b;
207  /* Hack inspired from glibc: only try the division if nelem and elsize
208  * are both greater than sqrt(SIZE_MAX). */
209  if ((a | b) >= ((size_t)1 << (sizeof(size_t) * 4)) && a && t / a != b)
210  return AVERROR(EINVAL);
211  *r = t;
212  return 0;
213 }
214 
218 void av_max_alloc(size_t max);
219 
229 void av_memcpy_backptr(uint8_t *dst, int back, int cnt);
230 
235 #endif /* AVUTIL_MEM_H */