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70 lines
2.7 KiB
C
70 lines
2.7 KiB
C
/*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* 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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* FFmpeg 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
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* GNU 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 License
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* along with FFmpeg; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVUTIL_DYNARRAY_H
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#define AVUTIL_DYNARRAY_H
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#include "log.h"
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#include "mem.h"
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/**
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* Add an element of to a dynamic array.
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*
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* The array is reallocated when its number of elements reaches powers of 2.
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* Therefore, the amortized cost of adding an element is constant.
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*
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* In case of success, the pointer to the array is updated in order to
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* point to the new grown array, and the size is incremented.
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*
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* @param av_size_max maximum size of the array, usually the MAX macro of
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* the type of the size
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* @param av_elt_size size of the elements in the array, in bytes
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* @param av_array pointer to the array, must be a lvalue
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* @param av_size size of the array, must be an integer lvalue
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* @param av_success statement to execute on success; at this point, the
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* size variable is not yet incremented
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* @param av_failure statement to execute on failure; if this happens, the
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* array and size are not changed; the statement can end
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* with a return or a goto
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*/
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#define FF_DYNARRAY_ADD(av_size_max, av_elt_size, av_array, av_size, \
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av_success, av_failure) \
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do { \
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size_t av_size_new = (av_size); \
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if (!((av_size) & ((av_size) - 1))) { \
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av_size_new = (av_size) ? (av_size) << 1 : 1; \
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if (av_size_new > (av_size_max) / (av_elt_size)) { \
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av_size_new = 0; \
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} else { \
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void *av_array_new = \
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av_realloc((av_array), av_size_new * (av_elt_size)); \
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if (!av_array_new) \
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av_size_new = 0; \
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else \
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(av_array) = av_array_new; \
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} \
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} \
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if (av_size_new) { \
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{ av_success } \
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(av_size)++; \
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} else { \
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av_failure \
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} \
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} while (0)
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#endif /* AVUTIL_DYNARRAY_H */
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