| /* |
| * 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 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 */ |
