mem.h
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1 /*
2  * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
3  *
4  * This file is part of Libav.
5  *
6  * Libav 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  * Libav 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 Libav; 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 "avutil.h"
34 
41 #if defined(__ICC) && __ICC < 1200 || defined(__SUNPRO_C)
42  #define DECLARE_ALIGNED(n,t,v) t __attribute__ ((aligned (n))) v
43  #define DECLARE_ASM_CONST(n,t,v) const t __attribute__ ((aligned (n))) v
44 #elif defined(__TI_COMPILER_VERSION__)
45  #define DECLARE_ALIGNED(n,t,v) \
46  AV_PRAGMA(DATA_ALIGN(v,n)) \
47  t __attribute__((aligned(n))) v
48  #define DECLARE_ASM_CONST(n,t,v) \
49  AV_PRAGMA(DATA_ALIGN(v,n)) \
50  static const t __attribute__((aligned(n))) v
51 #elif defined(__GNUC__)
52  #define DECLARE_ALIGNED(n,t,v) t __attribute__ ((aligned (n))) v
53  #define DECLARE_ASM_CONST(n,t,v) static const t av_used __attribute__ ((aligned (n))) v
54 #elif defined(_MSC_VER)
55  #define DECLARE_ALIGNED(n,t,v) __declspec(align(n)) t v
56  #define DECLARE_ASM_CONST(n,t,v) __declspec(align(n)) static const t v
57 #else
58  #define DECLARE_ALIGNED(n,t,v) t v
59  #define DECLARE_ASM_CONST(n,t,v) static const t v
60 #endif
61 
62 #if AV_GCC_VERSION_AT_LEAST(3,1)
63  #define av_malloc_attrib __attribute__((__malloc__))
64 #else
65  #define av_malloc_attrib
66 #endif
67 
68 #if AV_GCC_VERSION_AT_LEAST(4,3)
69  #define av_alloc_size(...) __attribute__((alloc_size(__VA_ARGS__)))
70 #else
71  #define av_alloc_size(...)
72 #endif
73 
83 
93 av_alloc_size(1, 2) static inline void *av_malloc_array(size_t nmemb, size_t size)
94 {
95  if (size <= 0 || nmemb >= INT_MAX / size)
96  return NULL;
97  return av_malloc(nmemb * size);
98 }
99 
112 void *av_realloc(void *ptr, size_t size) av_alloc_size(2);
113 
122 void av_free(void *ptr);
123 
133 
144 av_alloc_size(1, 2) static inline void *av_mallocz_array(size_t nmemb, size_t size)
145 {
146  if (size <= 0 || nmemb >= INT_MAX / size)
147  return NULL;
148  return av_mallocz(nmemb * size);
149 }
150 
157 char *av_strdup(const char *s) av_malloc_attrib;
158 
166 void av_freep(void *ptr);
167 
177 void av_memcpy_backptr(uint8_t *dst, int back, int cnt);
178 
183 #endif /* AVUTIL_MEM_H */