mem.h

См. документацию.

/*
 * 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
 */
 
#ifndef AVUTIL_MEM_H
#define AVUTIL_MEM_H
 
#include <limits.h>
#include <stdint.h>
 
#include "attributes.h"
#include "error.h"
#include "avutil.h"
 
#if defined(__INTEL_COMPILER) && __INTEL_COMPILER < 1110 || defined(__SUNPRO_C)
    #define DECLARE_ALIGNED(n,t,v)      t __attribute__ ((aligned (n))) v
    #define DECLARE_ASM_ALIGNED(n,t,v)  t __attribute__ ((aligned (n))) v
    #define DECLARE_ASM_CONST(n,t,v)    const t __attribute__ ((aligned (n))) v
#elif defined(__DJGPP__)
    #define DECLARE_ALIGNED(n,t,v)      t __attribute__ ((aligned (FFMIN(n, 16)))) v
    #define DECLARE_ASM_ALIGNED(n,t,v)  t av_used __attribute__ ((aligned (FFMIN(n, 16)))) v
    #define DECLARE_ASM_CONST(n,t,v)    static const t av_used __attribute__ ((aligned (FFMIN(n, 16)))) v
#elif defined(__GNUC__) || defined(__clang__)
    #define DECLARE_ALIGNED(n,t,v)      t __attribute__ ((aligned (n))) v
    #define DECLARE_ASM_ALIGNED(n,t,v)  t av_used __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_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_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
 
void *av_malloc(size_t size) av_malloc_attrib av_alloc_size(1);
 
void *av_mallocz(size_t size) av_malloc_attrib av_alloc_size(1);
 
av_alloc_size(1, 2) void *av_malloc_array(size_t nmemb, size_t size);
 
av_alloc_size(1, 2) void *av_mallocz_array(size_t nmemb, size_t size);
 
void *av_calloc(size_t nmemb, size_t size) av_malloc_attrib;
 
void *av_realloc(void *ptr, size_t size) av_alloc_size(2);
 
av_warn_unused_result
int av_reallocp(void *ptr, size_t size);
 
void *av_realloc_f(void *ptr, size_t nelem, size_t elsize);
 
av_alloc_size(2, 3) void *av_realloc_array(void *ptr, size_t nmemb, size_t size);
 
int av_reallocp_array(void *ptr, size_t nmemb, size_t size);
 
void *av_fast_realloc(void *ptr, unsigned int *size, size_t min_size);
 
void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size);
 
void av_fast_mallocz(void *ptr, unsigned int *size, size_t min_size);
 
void av_free(void *ptr);
 
void av_freep(void *ptr);
 
char *av_strdup(const char *s) av_malloc_attrib;
 
char *av_strndup(const char *s, size_t len) av_malloc_attrib;
 
void *av_memdup(const void *p, size_t size);
 
void av_memcpy_backptr(uint8_t *dst, int back, int cnt);
 
void av_dynarray_add(void *tab_ptr, int *nb_ptr, void *elem);
 
av_warn_unused_result
int av_dynarray_add_nofree(void *tab_ptr, int *nb_ptr, void *elem);
 
void *av_dynarray2_add(void **tab_ptr, int *nb_ptr, size_t elem_size,
                       const uint8_t *elem_data);
 
static inline int av_size_mult(size_t a, size_t b, size_t *r)
{
    size_t t = a * b;
    /* Hack inspired from glibc: don't try the division if nelem and elsize
     * are both less 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;
}
 
void av_max_alloc(size_t max);
 
#endif /* AVUTIL_MEM_H */