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133 lines
4.5 KiB
C
133 lines
4.5 KiB
C
/*
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* copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#pragma once
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#include <limits.h>
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#include <stdint.h>
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#include <errno.h>
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#include <stddef.h>
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#include "compat.h"
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/**
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* Allocate a block of size bytes with alignment suitable for all
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* memory accesses (including vectors if available on the CPU).
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* @param size Size in bytes for the memory block to be allocated.
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* @return Pointer to the allocated block, NULL if the block cannot
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* be allocated.
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* @see av_mallocz()
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*/
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void *av_malloc(size_t size);
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/**
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* Allocate a block of size * nmemb bytes with av_malloc().
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* @param nmemb Number of elements
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* @param size Size of the single element
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* @return Pointer to the allocated block, NULL if the block cannot
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* be allocated.
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* @see av_malloc()
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*/
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static inline void *av_malloc_array(size_t nmemb, size_t size)
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{
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if (!size || nmemb >= INT_MAX / size)
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return NULL;
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return av_malloc(nmemb * size);
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}
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/**
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* Allocate or reallocate a block of memory.
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* If ptr is NULL and size > 0, allocate a new block. If
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* size is zero, free the memory block pointed to by ptr.
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* @param ptr Pointer to a memory block already allocated with
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* av_realloc() or NULL.
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* @param size Size in bytes of the memory block to be allocated or
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* reallocated.
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* @return Pointer to a newly-reallocated block or NULL if the block
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* cannot be reallocated or the function is used to free the memory block.
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* @warning Pointers originating from the av_malloc() family of functions must
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* not be passed to av_realloc(). The former can be implemented using
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* memalign() (or other functions), and there is no guarantee that
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* pointers from such functions can be passed to realloc() at all.
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* The situation is undefined according to POSIX and may crash with
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* some libc implementations.
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*/
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void *av_realloc(void *ptr, size_t size);
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/**
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* Allocate or reallocate a block of memory.
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* This function does the same thing as av_realloc, except:
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* - It takes two arguments and checks the result of the multiplication for
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* integer overflow.
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* - It frees the input block in case of failure, thus avoiding the memory
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* leak with the classic "buf = realloc(buf); if (!buf) return -1;".
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*/
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void *av_realloc_f(void *ptr, size_t nelem, size_t elsize);
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/**
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* Free a memory block which has been allocated with av_malloc(z)() or
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* av_realloc().
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* @param ptr Pointer to the memory block which should be freed.
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* @note ptr = NULL is explicitly allowed.
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* @note It is recommended that you use av_freep() instead.
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* @see av_freep()
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*/
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void av_free(void *ptr);
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/**
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* Allocate a block of size bytes with alignment suitable for all
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* memory accesses (including vectors if available on the CPU) and
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* zero all the bytes of the block.
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* @param size Size in bytes for the memory block to be allocated.
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* @return Pointer to the allocated block, NULL if it cannot be allocated.
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* @see av_malloc()
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*/
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void *av_mallocz(size_t size);
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/**
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* Allocate a block of size * nmemb bytes with av_mallocz().
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* @param nmemb Number of elements
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* @param size Size of the single element
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* @return Pointer to the allocated block, NULL if the block cannot
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* be allocated.
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* @see av_mallocz()
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* @see av_malloc_array()
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*/
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static inline void *av_mallocz_array(size_t nmemb, size_t size)
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{
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if (!size || nmemb >= INT_MAX / size)
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return NULL;
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return av_mallocz(nmemb * size);
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}
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/**
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* Free a memory block which has been allocated with av_malloc(z)() or
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* av_realloc() and set the pointer pointing to it to NULL.
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* @param ptr Pointer to the pointer to the memory block which should
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* be freed.
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* @note passing a pointer to a NULL pointer is safe and leads to no action.
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* @see av_free()
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*/
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void av_freep(void *ptr);
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/**
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* @}
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*/
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