mirror of https://git.ffmpeg.org/ffmpeg.git
266 lines
10 KiB
C
266 lines
10 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 Libav.
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*
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* Libav 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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* Libav 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 Libav; 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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/**
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* @file
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* memory handling functions
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*/
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#ifndef AVUTIL_MEM_H
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#define AVUTIL_MEM_H
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#include <limits.h>
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#include <stdint.h>
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#include "attributes.h"
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#include "avutil.h"
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/**
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* @addtogroup lavu_mem
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* @{
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*/
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#if defined(__ICC) && __ICC < 1200 || defined(__SUNPRO_C)
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#define DECLARE_ALIGNED(n,t,v) t __attribute__ ((aligned (n))) v
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#define DECLARE_ASM_CONST(n,t,v) const t __attribute__ ((aligned (n))) v
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#elif defined(__TI_COMPILER_VERSION__)
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#define DECLARE_ALIGNED(n,t,v) \
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AV_PRAGMA(DATA_ALIGN(v,n)) \
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t __attribute__((aligned(n))) v
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#define DECLARE_ASM_CONST(n,t,v) \
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AV_PRAGMA(DATA_ALIGN(v,n)) \
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static const t __attribute__((aligned(n))) v
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#elif defined(__GNUC__) || defined(__clang__)
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#define DECLARE_ALIGNED(n,t,v) t __attribute__ ((aligned (n))) v
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#define DECLARE_ASM_CONST(n,t,v) static const t av_used __attribute__ ((aligned (n))) v
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#elif defined(_MSC_VER)
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#define DECLARE_ALIGNED(n,t,v) __declspec(align(n)) t v
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#define DECLARE_ASM_CONST(n,t,v) __declspec(align(n)) static const t v
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#else
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#define DECLARE_ALIGNED(n,t,v) t v
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#define DECLARE_ASM_CONST(n,t,v) static const t v
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#endif
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#if AV_GCC_VERSION_AT_LEAST(3,1)
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#define av_malloc_attrib __attribute__((__malloc__))
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#else
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#define av_malloc_attrib
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#endif
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#if AV_GCC_VERSION_AT_LEAST(4,3)
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#define av_alloc_size(...) __attribute__((alloc_size(__VA_ARGS__)))
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#else
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#define av_alloc_size(...)
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#endif
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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) av_malloc_attrib av_alloc_size(1);
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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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av_alloc_size(1, 2) void *av_malloc_array(size_t nmemb, size_t size);
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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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* @see av_fast_realloc()
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*/
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void *av_realloc(void *ptr, size_t size) av_alloc_size(2);
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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 pointer to a memory block already allocated
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* with av_realloc(), or pointer to a pointer to NULL.
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* The pointer is updated on success, or freed on failure.
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* @param size Size in bytes for the memory block to be allocated or
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* reallocated
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* @return Zero on success, an AVERROR error code on failure.
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* @warning Pointers originating from the av_malloc() family of functions must
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* not be passed to av_reallocp(). 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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int av_reallocp(void *ptr, size_t size);
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/**
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* Allocate or reallocate an array.
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* If ptr is NULL and nmemb > 0, allocate a new block. If
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* nmemb 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 nmemb Number of elements
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* @param size Size of the single element
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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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av_alloc_size(2, 3) void *av_realloc_array(void *ptr, size_t nmemb, size_t size);
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/**
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* Allocate or reallocate an array through a pointer to a pointer.
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* If *ptr is NULL and nmemb > 0, allocate a new block. If
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* nmemb is zero, free the memory block pointed to by ptr.
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* @param ptr Pointer to a pointer to a memory block already allocated
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* with av_realloc(), or pointer to a pointer to NULL.
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* The pointer is updated on success, or freed on failure.
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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 Zero on success, an AVERROR error code on failure.
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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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av_alloc_size(2, 3) int av_reallocp_array(void *ptr, size_t nmemb, size_t size);
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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) av_malloc_attrib av_alloc_size(1);
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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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av_alloc_size(1, 2) void *av_mallocz_array(size_t nmemb, size_t size);
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/**
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* Duplicate the string s.
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* @param s string to be duplicated
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* @return Pointer to a newly-allocated string containing a
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* copy of s or NULL if the string cannot be allocated.
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*/
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char *av_strdup(const char *s) av_malloc_attrib;
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/**
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* Duplicate a substring of the string s.
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* @param s string to be duplicated
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* @param len the maximum length of the resulting string (not counting the
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* terminating byte).
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* @return Pointer to a newly-allocated string containing a
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* copy of s or NULL if the string cannot be allocated.
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*/
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char *av_strndup(const char *s, size_t len) av_malloc_attrib;
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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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* @see av_free()
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*/
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void av_freep(void *ptr);
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/**
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* deliberately overlapping memcpy implementation
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* @param dst destination buffer
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* @param back how many bytes back we start (the initial size of the overlapping window)
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* @param cnt number of bytes to copy, must be >= 0
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*
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* cnt > back is valid, this will copy the bytes we just copied,
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* thus creating a repeating pattern with a period length of back.
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*/
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void av_memcpy_backptr(uint8_t *dst, int back, int cnt);
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/**
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* Reallocate the given block if it is not large enough, otherwise do nothing.
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*
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* @see av_realloc
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*/
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void *av_fast_realloc(void *ptr, unsigned int *size, size_t min_size);
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/**
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* Allocate a buffer, reusing the given one if large enough.
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*
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* Contrary to av_fast_realloc the current buffer contents might not be
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* preserved and on error the old buffer is freed, thus no special
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* handling to avoid memleaks is necessary.
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*
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* @param ptr pointer to pointer to already allocated buffer, overwritten with pointer to new buffer
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* @param size size of the buffer *ptr points to
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* @param min_size minimum size of *ptr buffer after returning, *ptr will be NULL and
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* *size 0 if an error occurred.
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*/
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void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size);
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/**
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* @}
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*/
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#endif /* AVUTIL_MEM_H */
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