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/*
* 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 mem.h
* Memory handling functions.
*/
#ifndef AVUTIL_MEM_H
#define AVUTIL_MEM_H
#include "common.h"
#if defined(__ICC) || defined(__SUNPRO_C)
#define DECLARE_ALIGNED(n,t,v) t v __attribute__ ((aligned (n)))
#define DECLARE_ASM_CONST(n,t,v) const t __attribute__ ((aligned (n))) v
#elif defined(__GNUC__)
#define DECLARE_ALIGNED(n,t,v) t v __attribute__ ((aligned (n)))
#define DECLARE_ASM_CONST(n,t,v) static const t v attribute_used __attribute__ ((aligned (n)))
#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
#elif defined(HAVE_INLINE_ASM)
#error The asm code needs alignment, but we do not know how to do it for this compiler.
#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(n) __attribute__((alloc_size(n)))
#else
#define av_alloc_size(n)
#endif
/**
* Allocate a block of \p 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 it cannot allocate
* it.
* @see av_mallocz()
*/
void *av_malloc(unsigned int size) av_malloc_attrib av_alloc_size(1);
/**
* Allocate or reallocate a block of memory.
* If \p ptr is NULL and \p size > 0, allocate a new block. If \p
* size is zero, free the memory block pointed by \p ptr.
* @param size Size in bytes for the memory block to be allocated or
* reallocated.
* @param ptr Pointer to a memory block already allocated with
* av_malloc(z)() or av_realloc() or NULL.
* @return Pointer to a newly reallocated block or NULL if it cannot
* reallocate or the function is used to free the memory block.
* @see av_fast_realloc()
*/
void *av_realloc(void *ptr, unsigned int size) av_alloc_size(2);
/**
* 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 \p size bytes with alignment suitable for all
* memory accesses (including vectors if available on the CPU) and
* set to zeroes 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 allocate
* it.
* @see av_malloc()
*/
void *av_mallocz(unsigned int size) av_malloc_attrib av_alloc_size(1);
/**
* Duplicate the string \p s.
* @param s String to be duplicated.
* @return Pointer to a newly allocated string containing a
* copy of \p s or NULL if it 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 to NULL the pointer to it.
* @param ptr Pointer to the pointer to the memory block which should
* be freed.
* @see av_free()
*/
void av_freep(void *ptr);
#endif /* AVUTIL_MEM_H */
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