+++ /dev/null
-/*
- * 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);
-
-/**
- * Allocate a block of size * nmemb bytes with 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 || 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_realloc() or NULL.
- * @param size Size in bytes of 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.
- * @warning Pointers originating from the av_malloc() family of functions must
- * not be passed to av_realloc(). The former can be implemented using
- * memalign() (or other functions), and there is no guarantee that
- * pointers from such functions can be passed to realloc() at all.
- * The situation is undefined according to POSIX and may crash with
- * some libc implementations.
- * @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);
-
-/**
- * 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 pointer to a memory block already allocated
- * with av_realloc(), or pointer to a pointer to NULL.
- * The pointer is updated on success, or freed on failure.
- * @param size Size in bytes for the memory block to be allocated or
- * reallocated
- * @return Zero on success, an AVERROR error code on failure.
- * @warning Pointers originating from the av_malloc() family of functions must
- * not be passed to av_reallocp(). The former can be implemented using
- * memalign() (or other functions), and there is no guarantee that
- * pointers from such functions can be passed to realloc() at all.
- * The situation is undefined according to POSIX and may crash with
- * some libc implementations.
- */
-av_warn_unused_result
-int av_reallocp(void *ptr, size_t size);
-
-/**
- * Allocate or reallocate an array.
- * If ptr is NULL and nmemb > 0, allocate a new block. If
- * nmemb is zero, free the memory block pointed to by ptr.
- * @param ptr Pointer to a memory block already allocated with
- * av_realloc() or NULL.
- * @param nmemb Number of elements
- * @param size Size of the single element
- * @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.
- * @warning Pointers originating from the av_malloc() family of functions must
- * not be passed to av_realloc(). The former can be implemented using
- * memalign() (or other functions), and there is no guarantee that
- * pointers from such functions can be passed to realloc() at all.
- * The situation is undefined according to POSIX and may crash with
- * some libc implementations.
- */
-av_alloc_size(2, 3) void *av_realloc_array(void *ptr, size_t nmemb, size_t size);
-
-/**
- * Allocate or reallocate an array through a pointer to a pointer.
- * If *ptr is NULL and nmemb > 0, allocate a new block. If
- * nmemb is zero, free the memory block pointed to by ptr.
- * @param ptr Pointer to a pointer to a memory block already allocated
- * with av_realloc(), or pointer to a pointer to NULL.
- * The pointer is updated on success, or freed on failure.
- * @param nmemb Number of elements
- * @param size Size of the single element
- * @return Zero on success, an AVERROR error code on failure.
- * @warning Pointers originating from the av_malloc() family of functions must
- * not be passed to av_realloc(). The former can be implemented using
- * memalign() (or other functions), and there is no guarantee that
- * pointers from such functions can be passed to realloc() at all.
- * The situation is undefined according to POSIX and may crash with
- * some libc implementations.
- */
-av_alloc_size(2, 3) int av_reallocp_array(void *ptr, size_t nmemb, size_t size);
-
-/**
- * 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;
-
-/**
- * Allocate a block of size * nmemb bytes with 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 || 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;
-
-/**
- * Duplicate a substring of the string s.
- * @param s string to be duplicated
- * @param len the maximum length of the resulting string (not counting the
- * terminating byte).
- * @return Pointer to a newly-allocated string containing a
- * copy of s or NULL if the string cannot be allocated.
- */
-char *av_strndup(const char *s, size_t len) av_malloc_attrib;
-
-/**
- * Duplicate the buffer p.
- * @param p buffer to be duplicated
- * @return Pointer to a newly allocated buffer containing a
- * copy of p or NULL if the buffer cannot be allocated.
- */
-void *av_memdup(const void *p, size_t size);
-
-/**
- * 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.
- * @note passing a pointer to a NULL pointer is safe and leads to no action.
- * @see av_free()
- */
-void av_freep(void *ptr);
-
-/**
- * Add an element to a dynamic array.
- *
- * The array to grow is supposed to be an array of pointers to
- * structures, and the element to add must be a pointer to an already
- * allocated structure.
- *
- * The array is reallocated when its size reaches powers of 2.
- * Therefore, the amortized cost of adding an element is constant.
- *
- * In case of success, the pointer to the array is updated in order to
- * point to the new grown array, and the number pointed to by nb_ptr
- * is incremented.
- * In case of failure, the array is freed, *tab_ptr is set to NULL and
- * *nb_ptr is set to 0.
- *
- * @param tab_ptr pointer to the array to grow
- * @param nb_ptr pointer to the number of elements in the array
- * @param elem element to add
- * @see av_dynarray_add_nofree(), av_dynarray2_add()
- */
-void av_dynarray_add(void *tab_ptr, int *nb_ptr, void *elem);
-
-/**
- * Add an element to a dynamic array.
- *
- * Function has the same functionality as av_dynarray_add(),
- * but it doesn't free memory on fails. It returns error code
- * instead and leave current buffer untouched.
- *
- * @param tab_ptr pointer to the array to grow
- * @param nb_ptr pointer to the number of elements in the array
- * @param elem element to add
- * @return >=0 on success, negative otherwise.
- * @see av_dynarray_add(), av_dynarray2_add()
- */
-av_warn_unused_result
-int av_dynarray_add_nofree(void *tab_ptr, int *nb_ptr, void *elem);
-
-/**
- * Add an element of size elem_size to a dynamic array.
- *
- * The array is reallocated when its number of elements reaches powers of 2.
- * Therefore, the amortized cost of adding an element is constant.
- *
- * In case of success, the pointer to the array is updated in order to
- * point to the new grown array, and the number pointed to by nb_ptr
- * is incremented.
- * In case of failure, the array is freed, *tab_ptr is set to NULL and
- * *nb_ptr is set to 0.
- *
- * @param tab_ptr pointer to the array to grow
- * @param nb_ptr pointer to the number of elements in the array
- * @param elem_size size in bytes of the elements in the array
- * @param elem_data pointer to the data of the element to add. If NULL, the space of
- * the new added element is not filled.
- * @return pointer to the data of the element to copy in the new allocated space.
- * If NULL, the new allocated space is left uninitialized."
- * @see av_dynarray_add(), av_dynarray_add_nofree()
- */
-void *av_dynarray2_add(void **tab_ptr, int *nb_ptr, size_t elem_size,
- const uint8_t *elem_data);
-
-/**
- * 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);
-
-/**
- * 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);
-
-/**
- * Reallocate the given block if it is not large enough, otherwise do nothing.
- *
- * @see av_realloc
- */
-void *av_fast_realloc(void *ptr, unsigned int *size, size_t min_size);
-
-/**
- * Allocate a buffer, reusing the given one if large enough.
- *
- * Contrary to av_fast_realloc the current buffer contents might not be
- * preserved and on error the old buffer is freed, thus no special
- * handling to avoid memleaks is necessary.
- *
- * @param ptr pointer to pointer to already allocated buffer, overwritten with pointer to new buffer
- * @param size size of the buffer *ptr points to
- * @param min_size minimum size of *ptr buffer after returning, *ptr will be NULL and
- * *size 0 if an error occurred.
- */
-void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size);
-
-/**
- * Allocate a buffer, reusing the given one if large enough.
- *
- * All newly allocated space is initially cleared
- * Contrary to av_fast_realloc the current buffer contents might not be
- * preserved and on error the old buffer is freed, thus no special
- * handling to avoid memleaks is necessary.
- *
- * @param ptr pointer to pointer to already allocated buffer, overwritten with pointer to new buffer
- * @param size size of the buffer *ptr points to
- * @param min_size minimum size of *ptr buffer after returning, *ptr will be NULL and
- * *size 0 if an error occurred.
- */
-void av_fast_mallocz(void *ptr, unsigned int *size, size_t min_size);
-
-/**
- * @}
- */
-
-#endif /* AVUTIL_MEM_H */
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