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lavu/mem: add av_dynarray2_add()

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Based on a patch by Clément Bœsch.

See thread:
From: Clément Bœsch <ubitux@gmail.com>
Subject: [FFmpeg-devel] [PATCH 1/5] lavu: add av_dynarray_alloc_elem().
Date: Sun, 14 Apr 2013 03:07:54 +0200
This commit is contained in:
Stefano Sabatini
2013-04-14 03:07:54 +02:00
parent 84be806982
commit e3984166a4
4 changed files with 62 additions and 1 deletions
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25
libavutil/mem.h
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@@ -215,9 +215,34 @@ void av_freep(void *ptr);
* @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_dynarray2_add()
*/
void av_dynarray_add(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()
*/
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.