1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
|
/*
* 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
*/
#include "common.h"
#include "log.h"
#include "tree.h"
typedef struct AVTreeNode{
struct AVTreeNode *child[2];
void *elem;
int state;
}AVTreeNode;
void *av_tree_find(const AVTreeNode *t, void *key, int (*cmp)(void *key, const void *b), void *next[2]){
if(t){
unsigned int v= cmp(t->elem, key);
if(v){
if(next) next[(v>>31)^1]= t->elem;
return av_tree_find(t->child[v>>31], key, cmp, next);
}else{
if(next){
av_tree_find(t->child[0], key, cmp, next);
av_tree_find(t->child[1], key, cmp, next);
}
return t->elem;
}
}
return NULL;
}
void *av_tree_insert(AVTreeNode **tp, void *key, int (*cmp)(void *key, const void *b)){
AVTreeNode *t= *tp;
if(t){
unsigned int v= cmp(t->elem, key);
if(v){
int i= v>>31;
AVTreeNode **child= &t->child[i];
void *ret= av_tree_insert(child, key, cmp);
if(!ret){
t->state -= ((int)v>>31)|1;
if(!(t->state&1)){
if(t->state){
if((*child)->state*2 == t->state){
*tp= *child;
*child= (*child)->child[i^1];
(*tp)->child[i^1]= t;
t->state= 0;
}else{
*tp= (*child)->child[i^1];
(*child)->child[i^1]= (*tp)->child[i];
(*tp)->child[i]= *child;
*child= (*tp)->child[i^1];
(*tp)->child[i^1]= t;
i= (*tp)->state > 0;
(*tp)->child[i ]->state= 0;
(*tp)->child[i^1]->state= -(*tp)->state;
}
(*tp)->state=0;
}
return key;
}
}
return ret;
}else{
return t->elem;
}
}else{
*tp= av_mallocz(sizeof(AVTreeNode));
(*tp)->elem= key;
return NULL;
}
}
void av_tree_destroy(AVTreeNode *t){
av_tree_destroy(t->child[0]);
av_tree_destroy(t->child[1]);
av_free(t);
}
#if 0
void av_tree_enumerate(AVTreeNode *t, void *opaque, int (*f)(void *opaque, void *elem)){
int v= f(opaque, t->elem);
if(v>=0) av_tree_enumerate(t->child[0], opaque, f);
if(v<=0) av_tree_enumerate(t->child[1], opaque, f);
}
#endif
#ifdef TEST
static int check(AVTreeNode *t){
if(t){
int left= check(t->child[0]);
int right= check(t->child[1]);
if(left>999 || right>999)
return 1000;
if(right - left != t->state)
return 1000;
if(t->state>1 || t->state<-1)
return 1000;
return FFMAX(left, right)+1;
}
return 0;
}
static void print(AVTreeNode *t, int depth){
int i;
for(i=0; i<depth*4; i++) av_log(NULL, AV_LOG_ERROR, " ");
if(t){
av_log(NULL, AV_LOG_ERROR, "Node %p %2d %4d\n", t, t->state, t->elem);
print(t->child[0], depth+1);
print(t->child[1], depth+1);
}else
av_log(NULL, AV_LOG_ERROR, "NULL\n");
}
int cmp(const void *a, const void *b){
return a-b;
}
int main(void){
int i,j,k;
AVTreeNode *root= NULL;
for(i=0; i<10000; i++){
int j= (random()%863294);
if(check(root) > 999){
av_log(NULL, AV_LOG_ERROR, "FATAL error %d\n", i);
print(root, 0);
return -1;
}
av_log(NULL, AV_LOG_ERROR, "inserting %4d\n", j);
av_tree_insert(&root, (void*)(j+1), cmp);
}
return 0;
}
#endif
|
