/* * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> * * 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 */ /** * @file tree.h * A tree container. * @author Michael Niedermayer <michaelni@gmx.at> */ #ifndef TREE_H #define TREE_H struct AVTreeNode; /** * Finds an element. * @param root a pointer to the root node of the tree * @param next If next is not NULL then next[0] will contain the previous * element and next[1] the next element if either does not exist * then the corresponding entry in next is unchanged. * @return An element with cmp(key, elem)==0 or NULL if no such element exists in * the tree. */ void *av_tree_find(const struct AVTreeNode *root, void *key, int (*cmp)(void *key, const void *b), void *next[2]); /** * Finds a element for which cmp(key, elem)==0, if no such element is found key * is inserted into the tree. * @param rootp A pointer to a pointer to the root node of the tree. Note that * the root node can change during insertions, this is required * to keep the tree balanced. * * @return If no insertion happened, the found element. * If an insertion happened, then either key or NULL will be returned. * Which one it is depends on the tree state and the implementation. You * should make no assumptions that it's one or the other in the code. */ void *av_tree_insert(struct AVTreeNode **rootp, void *key, int (*cmp)(void *key, const void *b)); void av_tree_destroy(struct AVTreeNode *t); #endif /* TREE_H */