Fix test program compilation: Add missing #include and update the call
[libav.git] / libavutil / tree.c
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1/*
2 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21#include "common.h"
22#include "log.h"
23#include "tree.h"
24
25typedef struct AVTreeNode{
26 struct AVTreeNode *child[2];
27 void *elem;
28 int state;
29}AVTreeNode;
30
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31const int av_tree_node_size = sizeof(AVTreeNode);
32
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33void *av_tree_find(const AVTreeNode *t, void *key, int (*cmp)(void *key, const void *b), void *next[2]){
34 if(t){
2e1d2873 35 unsigned int v= cmp(key, t->elem);
9eb88fde 36 if(v){
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37 if(next) next[v>>31]= t->elem;
38 return av_tree_find(t->child[(v>>31)^1], key, cmp, next);
9eb88fde 39 }else{
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40 if(next){
41 av_tree_find(t->child[0], key, cmp, next);
42 av_tree_find(t->child[1], key, cmp, next);
43 }
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44 return t->elem;
45 }
46 }
47 return NULL;
48}
49
6e8b982b 50void *av_tree_insert(AVTreeNode **tp, void *key, int (*cmp)(void *key, const void *b), AVTreeNode **next){
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51 AVTreeNode *t= *tp;
52 if(t){
53 unsigned int v= cmp(t->elem, key);
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54 void *ret;
55 if(!v){
56 if(*next)
57 return t->elem;
58 else if(t->child[0]||t->child[1]){
59 int i= !t->child[0];
f05dda3b 60 void *next_elem[2];
3f161c7e 61 av_tree_find(t->child[i], key, cmp, next_elem);
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62 key= t->elem= next_elem[i];
63 v= -i;
64 }else{
65 *next= t;
66 *tp=NULL;
67 return NULL;
68 }
69 }
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70 ret= av_tree_insert(&t->child[v>>31], key, cmp, next);
71 if(!ret){
72 int i= (v>>31) ^ !!*next;
73 AVTreeNode **child= &t->child[i];
74 t->state += 2*i - 1;
f05dda3b 75
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76 if(!(t->state&1)){
77 if(t->state){
78 if((*child)->state*2 == -t->state){
79 *tp= (*child)->child[i^1];
80 (*child)->child[i^1]= (*tp)->child[i];
81 (*tp)->child[i]= *child;
82 *child= (*tp)->child[i^1];
83 (*tp)->child[i^1]= t;
9eb88fde 84
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85 (*tp)->child[0]->state= -((*tp)->state>0);
86 (*tp)->child[1]->state= (*tp)->state<0 ;
87 (*tp)->state=0;
88 }else{
89 *tp= *child;
90 *child= (*child)->child[i^1];
91 (*tp)->child[i^1]= t;
92 if((*tp)->state) t->state = 0;
93 else t->state>>= 1;
94 (*tp)->state= -t->state;
9eb88fde 95 }
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96 }
97 }
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98 if(!(*tp)->state ^ !!*next)
99 return key;
100 }
101 return ret;
9eb88fde 102 }else{
6e8b982b 103 *tp= *next; *next= NULL;
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104 (*tp)->elem= key;
105 return NULL;
106 }
107}
108
109void av_tree_destroy(AVTreeNode *t){
110 av_tree_destroy(t->child[0]);
111 av_tree_destroy(t->child[1]);
112 av_free(t);
113}
114
115#if 0
116void av_tree_enumerate(AVTreeNode *t, void *opaque, int (*f)(void *opaque, void *elem)){
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117 int v= f(opaque, t->elem);
118 if(v>=0) av_tree_enumerate(t->child[0], opaque, f);
119 if(v<=0) av_tree_enumerate(t->child[1], opaque, f);
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120}
121#endif
122
123#ifdef TEST
d5cb5fe8 124#undef random
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125static int check(AVTreeNode *t){
126 if(t){
127 int left= check(t->child[0]);
128 int right= check(t->child[1]);
129
130 if(left>999 || right>999)
131 return 1000;
132 if(right - left != t->state)
133 return 1000;
134 if(t->state>1 || t->state<-1)
135 return 1000;
136 return FFMAX(left, right)+1;
137 }
138 return 0;
139}
140
141static void print(AVTreeNode *t, int depth){
142 int i;
143 for(i=0; i<depth*4; i++) av_log(NULL, AV_LOG_ERROR, " ");
144 if(t){
145 av_log(NULL, AV_LOG_ERROR, "Node %p %2d %4d\n", t, t->state, t->elem);
146 print(t->child[0], depth+1);
147 print(t->child[1], depth+1);
148 }else
149 av_log(NULL, AV_LOG_ERROR, "NULL\n");
150}
151
152int cmp(const void *a, const void *b){
153 return a-b;
154}
155
f8a80fd6 156int main(void){
a005768d 157 int i,k;
f05dda3b 158 AVTreeNode *root= NULL, *node=NULL;
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159
160 for(i=0; i<10000; i++){
f05dda3b 161 int j= (random()%86294);
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162 if(check(root) > 999){
163 av_log(NULL, AV_LOG_ERROR, "FATAL error %d\n", i);
164 print(root, 0);
165 return -1;
166 }
167 av_log(NULL, AV_LOG_ERROR, "inserting %4d\n", j);
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168 if(!node)
169 node= av_mallocz(av_tree_node_size);
170 av_tree_insert(&root, (void*)(j+1), cmp, &node);
171
172 j= (random()%86294);
173 k= av_tree_find(root, (void*)(j+1), cmp, NULL);
174 if(k){
175 AVTreeNode *node2=NULL;
5d1e3d22 176 av_log(NULL, AV_LOG_ERROR, "removing %4d\n", j);
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177 av_tree_insert(&root, (void*)(j+1), cmp, &node2);
178 k= av_tree_find(root, (void*)(j+1), cmp, NULL);
179 if(k)
180 av_log(NULL, AV_LOG_ERROR, "removial failure %d\n", i);
181 }
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182 }
183 return 0;
184}
185#endif