/* * 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 FF_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 */