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Diffstat (limited to 'ffmpeg1/libavutil/mem.h')
| -rw-r--r-- | ffmpeg1/libavutil/mem.h | 235 |
1 files changed, 0 insertions, 235 deletions
diff --git a/ffmpeg1/libavutil/mem.h b/ffmpeg1/libavutil/mem.h deleted file mode 100644 index ced9453..0000000 --- a/ffmpeg1/libavutil/mem.h +++ /dev/null @@ -1,235 +0,0 @@ -/* - * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> - * - * This file is part of FFmpeg. - * - * FFmpeg is free software; you can redistribute it and/or - * modify it under the terms of the GNU Lesser General Public - * License as published by the Free Software Foundation; either - * version 2.1 of the License, or (at your option) any later version. - * - * FFmpeg is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * Lesser General Public License for more details. - * - * You should have received a copy of the GNU Lesser General Public - * License along with FFmpeg; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA - */ - -/** - * @file - * memory handling functions - */ - -#ifndef AVUTIL_MEM_H -#define AVUTIL_MEM_H - -#include <limits.h> -#include <stdint.h> - -#include "attributes.h" -#include "error.h" -#include "avutil.h" - -/** - * @addtogroup lavu_mem - * @{ - */ - - -#if defined(__INTEL_COMPILER) && __INTEL_COMPILER < 1110 || defined(__SUNPRO_C) - #define DECLARE_ALIGNED(n,t,v) t __attribute__ ((aligned (n))) v - #define DECLARE_ASM_CONST(n,t,v) const t __attribute__ ((aligned (n))) v -#elif defined(__TI_COMPILER_VERSION__) - #define DECLARE_ALIGNED(n,t,v) \ - AV_PRAGMA(DATA_ALIGN(v,n)) \ - t __attribute__((aligned(n))) v - #define DECLARE_ASM_CONST(n,t,v) \ - AV_PRAGMA(DATA_ALIGN(v,n)) \ - static const t __attribute__((aligned(n))) v -#elif defined(__GNUC__) - #define DECLARE_ALIGNED(n,t,v) t __attribute__ ((aligned (n))) v - #define DECLARE_ASM_CONST(n,t,v) static const t av_used __attribute__ ((aligned (n))) v -#elif defined(_MSC_VER) - #define DECLARE_ALIGNED(n,t,v) __declspec(align(n)) t v - #define DECLARE_ASM_CONST(n,t,v) __declspec(align(n)) static const t v -#else - #define DECLARE_ALIGNED(n,t,v) t v - #define DECLARE_ASM_CONST(n,t,v) static const t v -#endif - -#if AV_GCC_VERSION_AT_LEAST(3,1) - #define av_malloc_attrib __attribute__((__malloc__)) -#else - #define av_malloc_attrib -#endif - -#if AV_GCC_VERSION_AT_LEAST(4,3) - #define av_alloc_size(...) __attribute__((alloc_size(__VA_ARGS__))) -#else - #define av_alloc_size(...) -#endif - -/** - * Allocate a block of size bytes with alignment suitable for all - * memory accesses (including vectors if available on the CPU). - * @param size Size in bytes for the memory block to be allocated. - * @return Pointer to the allocated block, NULL if the block cannot - * be allocated. - * @see av_mallocz() - */ -void *av_malloc(size_t size) av_malloc_attrib av_alloc_size(1); - -/** - * Helper function to allocate a block of size * nmemb bytes with - * using av_malloc() - * @param nmemb Number of elements - * @param size Size of the single element - * @return Pointer to the allocated block, NULL if the block cannot - * be allocated. - * @see av_malloc() - */ -av_alloc_size(1, 2) static inline void *av_malloc_array(size_t nmemb, size_t size) -{ - if (size <= 0 || nmemb >= INT_MAX / size) - return NULL; - return av_malloc(nmemb * size); -} - -/** - * Allocate or reallocate a block of memory. - * If ptr is NULL and size > 0, allocate a new block. If - * size is zero, free the memory block pointed to by ptr. - * @param ptr Pointer to a memory block already allocated with - * av_malloc(z)() or av_realloc() or NULL. - * @param size Size in bytes for the memory block to be allocated or - * reallocated. - * @return Pointer to a newly reallocated block or NULL if the block - * cannot be reallocated or the function is used to free the memory block. - * @see av_fast_realloc() - */ -void *av_realloc(void *ptr, size_t size) av_alloc_size(2); - -/** - * Allocate or reallocate a block of memory. - * This function does the same thing as av_realloc, except: - * - It takes two arguments and checks the result of the multiplication for - * integer overflow. - * - It frees the input block in case of failure, thus avoiding the memory - * leak with the classic "buf = realloc(buf); if (!buf) return -1;". - */ -void *av_realloc_f(void *ptr, size_t nelem, size_t elsize); - -/** - * Free a memory block which has been allocated with av_malloc(z)() or - * av_realloc(). - * @param ptr Pointer to the memory block which should be freed. - * @note ptr = NULL is explicitly allowed. - * @note It is recommended that you use av_freep() instead. - * @see av_freep() - */ -void av_free(void *ptr); - -/** - * Allocate a block of size bytes with alignment suitable for all - * memory accesses (including vectors if available on the CPU) and - * zero all the bytes of the block. - * @param size Size in bytes for the memory block to be allocated. - * @return Pointer to the allocated block, NULL if it cannot be allocated. - * @see av_malloc() - */ -void *av_mallocz(size_t size) av_malloc_attrib av_alloc_size(1); - -/** - * Allocate a block of nmemb * size bytes with alignment suitable for all - * memory accesses (including vectors if available on the CPU) and - * zero all the bytes of the block. - * The allocation will fail if nmemb * size is greater than or equal - * to INT_MAX. - * @param nmemb - * @param size - * @return Pointer to the allocated block, NULL if it cannot be allocated. - */ -void *av_calloc(size_t nmemb, size_t size) av_malloc_attrib; - -/** - * Helper function to allocate a block of size * nmemb bytes with - * using av_mallocz() - * @param nmemb Number of elements - * @param size Size of the single element - * @return Pointer to the allocated block, NULL if the block cannot - * be allocated. - * @see av_mallocz() - * @see av_malloc_array() - */ -av_alloc_size(1, 2) static inline void *av_mallocz_array(size_t nmemb, size_t size) -{ - if (size <= 0 || nmemb >= INT_MAX / size) - return NULL; - return av_mallocz(nmemb * size); -} - -/** - * Duplicate the string s. - * @param s string to be duplicated - * @return Pointer to a newly allocated string containing a - * copy of s or NULL if the string cannot be allocated. - */ -char *av_strdup(const char *s) av_malloc_attrib; - -/** - * Free a memory block which has been allocated with av_malloc(z)() or - * av_realloc() and set the pointer pointing to it to NULL. - * @param ptr Pointer to the pointer to the memory block which should - * be freed. - * @see av_free() - */ -void av_freep(void *ptr); - -/** - * Add an element to a dynamic array. - * - * @param tab_ptr Pointer to the array. - * @param nb_ptr Pointer to the number of elements in the array. - * @param elem Element to be added. - */ -void av_dynarray_add(void *tab_ptr, int *nb_ptr, void *elem); - -/** - * Multiply two size_t values checking for overflow. - * @return 0 if success, AVERROR(EINVAL) if overflow. - */ -static inline int av_size_mult(size_t a, size_t b, size_t *r) -{ - size_t t = a * b; - /* Hack inspired from glibc: only try the division if nelem and elsize - * are both greater than sqrt(SIZE_MAX). */ - if ((a | b) >= ((size_t)1 << (sizeof(size_t) * 4)) && a && t / a != b) - return AVERROR(EINVAL); - *r = t; - return 0; -} - -/** - * Set the maximum size that may me allocated in one block. - */ -void av_max_alloc(size_t max); - -/** - * @brief deliberately overlapping memcpy implementation - * @param dst destination buffer - * @param back how many bytes back we start (the initial size of the overlapping window), must be > 0 - * @param cnt number of bytes to copy, must be >= 0 - * - * cnt > back is valid, this will copy the bytes we just copied, - * thus creating a repeating pattern with a period length of back. - */ -void av_memcpy_backptr(uint8_t *dst, int back, int cnt); - -/** - * @} - */ - -#endif /* AVUTIL_MEM_H */ |