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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 | |
| 21 /** | |
| 22 * @file libavutil/mem.h | |
| 23 * memory handling functions | |
| 24 */ | |
| 25 | |
| 26 #ifndef AVUTIL_MEM_H | |
| 27 #define AVUTIL_MEM_H | |
| 28 | |
| 29 #include "common.h" | |
| 30 | |
| 31 #if AV_GCC_VERSION_AT_LEAST(3,1) | |
| 32 #define av_malloc_attrib __attribute__((__malloc__)) | |
| 33 #else | |
| 34 #define av_malloc_attrib | |
| 35 #endif | |
| 36 | |
| 37 #if (!defined(__ICC) || __ICC > 1100) && AV_GCC_VERSION_AT_LEAST(4,3) | |
| 38 #define av_alloc_size(n) __attribute__((alloc_size(n))) | |
| 39 #else | |
| 40 #define av_alloc_size(n) | |
| 41 #endif | |
| 42 | |
| 43 /** | |
| 44 * Allocates a block of \p size bytes with alignment suitable for all | |
| 45 * memory accesses (including vectors if available on the CPU). | |
| 46 * @param size Size in bytes for the memory block to be allocated. | |
| 47 * @return Pointer to the allocated block, NULL if the block cannot | |
| 48 * be allocated. | |
| 49 * @see av_mallocz() | |
| 50 */ | |
| 51 void *av_malloc(unsigned int size) av_malloc_attrib av_alloc_size(1); | |
| 52 | |
| 53 /** | |
| 54 * Allocates or reallocates a block of memory. | |
| 55 * If \p ptr is NULL and \p size > 0, allocates a new block. If \p | |
| 56 * size is zero, frees the memory block pointed to by \p ptr. | |
| 57 * @param size Size in bytes for the memory block to be allocated or | |
| 58 * reallocated. | |
| 59 * @param ptr Pointer to a memory block already allocated with | |
| 60 * av_malloc(z)() or av_realloc() or NULL. | |
| 61 * @return Pointer to a newly reallocated block or NULL if the block | |
| 62 * cannot be reallocated or the function is used to free the memory block. | |
| 63 * @see av_fast_realloc() | |
| 64 */ | |
| 65 void *av_realloc(void *ptr, unsigned int size) av_alloc_size(2); | |
| 66 | |
| 67 /** | |
| 68 * Frees a memory block which has been allocated with av_malloc(z)() or | |
| 69 * av_realloc(). | |
| 70 * @param ptr Pointer to the memory block which should be freed. | |
| 71 * @note ptr = NULL is explicitly allowed. | |
| 72 * @note It is recommended that you use av_freep() instead. | |
| 73 * @see av_freep() | |
| 74 */ | |
| 75 void av_free(void *ptr); | |
| 76 | |
| 77 /** | |
| 78 * Allocates a block of \p size bytes with alignment suitable for all | |
| 79 * memory accesses (including vectors if available on the CPU) and | |
| 80 * zeroes all the bytes of the block. | |
| 81 * @param size Size in bytes for the memory block to be allocated. | |
| 82 * @return Pointer to the allocated block, NULL if it cannot be allocated. | |
| 83 * @see av_malloc() | |
| 84 */ | |
| 85 void *av_mallocz(unsigned int size) av_malloc_attrib av_alloc_size(1); | |
| 86 | |
| 87 /** | |
| 88 * Duplicates the string \p s. | |
| 89 * @param s string to be duplicated | |
| 90 * @return Pointer to a newly allocated string containing a | |
| 91 * copy of \p s or NULL if the string cannot be allocated. | |
| 92 */ | |
| 93 char *av_strdup(const char *s) av_malloc_attrib; | |
| 94 | |
| 95 /** | |
| 96 * Frees a memory block which has been allocated with av_malloc(z)() or | |
| 97 * av_realloc() and set the pointer pointing to it to NULL. | |
| 98 * @param ptr Pointer to the pointer to the memory block which should | |
| 99 * be freed. | |
| 100 * @see av_free() | |
| 101 */ | |
| 102 void av_freep(void *ptr); | |
| 103 | |
| 104 #endif /* AVUTIL_MEM_H */ | |
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