|
|
|
|
/*
|
|
|
|
|
* 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
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
#ifndef AVUTIL_DYNARRAY_H
|
|
|
|
|
#define AVUTIL_DYNARRAY_H
|
|
|
|
|
|
|
|
|
|
#include "log.h"
|
|
|
|
|
#include "mem.h"
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* Add an element of 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 size is incremented.
|
|
|
|
|
*
|
|
|
|
|
* @param av_size_max maximum size of the array, usually the MAX macro of
|
|
|
|
|
* the type of the size
|
|
|
|
|
* @param av_elt_size size of the elements in the array, in bytes
|
|
|
|
|
* @param av_array pointer to the array, must be a lvalue
|
|
|
|
|
* @param av_size size of the array, must be an integer lvalue
|
|
|
|
|
* @param av_success statement to execute on success; at this point, the
|
|
|
|
|
* size variable is not yet incremented
|
|
|
|
|
* @param av_failure statement to execute on failure; if this happens, the
|
|
|
|
|
* array and size are not changed; the statement can end
|
|
|
|
|
* with a return or a goto
|
|
|
|
|
*/
|
|
|
|
|
#define AV_DYNARRAY_ADD(av_size_max, av_elt_size, av_array, av_size, \
|
|
|
|
|
av_success, av_failure) \
|
|
|
|
|
do { \
|
|
|
|
|
size_t av_size_new = (av_size); \
|
|
|
|
|
if (!((av_size) & ((av_size) - 1))) { \
|
|
|
|
|
av_size_new = (av_size) ? (av_size) << 1 : 1; \
|
|
|
|
|
if (av_size_new > (av_size_max) / (av_elt_size)) { \
|
|
|
|
|
av_size_new = 0; \
|
|
|
|
|
} else { \
|
|
|
|
|
void *av_array_new = \
|
|
|
|
|
av_realloc((av_array), av_size_new * (av_elt_size)); \
|
|
|
|
|
if (!av_array_new) \
|
|
|
|
|
av_size_new = 0; \
|
|
|
|
|
else \
|
|
|
|
|
(av_array) = av_array_new; \
|
|
|
|
|
} \
|
|
|
|
|
} \
|
|
|
|
|
if (av_size_new) { \
|
|
|
|
|
{ av_success } \
|
|
|
|
|
(av_size)++; \
|
|
|
|
|
} else { \
|
|
|
|
|
av_failure \
|
|
|
|
|
} \
|
|
|
|
|
} while (0)
|
|
|
|
|
|
|
|
|
|
#endif /* AVUTIL_DYNARRAY_H */
|
