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70 lines
2.7 KiB
70 lines
2.7 KiB
/* |
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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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