FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavutil/tree.c
Date: 2024-02-16 17:37:06
Exec Total Coverage
Lines: 77 77 100.0%
Functions: 5 5 100.0%
Branches: 39 44 88.6%

Line Branch Exec Source
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 "error.h"
22 #include "log.h"
23 #include "mem.h"
24 #include "tree.h"
25
26 typedef struct AVTreeNode {
27 struct AVTreeNode *child[2];
28 void *elem;
29 int state;
30 } AVTreeNode;
31
32 const int av_tree_node_size = sizeof(AVTreeNode);
33
34 14576 struct AVTreeNode *av_tree_node_alloc(void)
35 {
36 14576 return av_mallocz(sizeof(struct AVTreeNode));
37 }
38
39 149606 void *av_tree_find(const AVTreeNode *t, void *key,
40 int (*cmp)(const void *key, const void *b), void *next[2])
41 {
42
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149606 if (t) {
43 132924 unsigned int v = cmp(key, t->elem);
44
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132924 if (v) {
45
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130960 if (next)
46 11034 next[v >> 31] = t->elem;
47 130960 return av_tree_find(t->child[(v >> 31) ^ 1], key, cmp, next);
48 } else {
49
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1964 if (next) {
50 1964 av_tree_find(t->child[0], key, cmp, next);
51 1964 av_tree_find(t->child[1], key, cmp, next);
52 }
53 1964 return t->elem;
54 }
55 }
56 16682 return NULL;
57 }
58
59 273746 void *av_tree_insert(AVTreeNode **tp, void *key,
60 int (*cmp)(const void *key, const void *b), AVTreeNode **next)
61 {
62 273746 AVTreeNode *t = *tp;
63
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273746 if (t) {
64 249742 unsigned int v = cmp(t->elem, key);
65 void *ret;
66
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249742 if (!v) {
67
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1412 if (*next)
68 510 return t->elem;
69
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902 else if (t->child[0] || t->child[1]) {
70 353 int i = !t->child[0];
71 void *next_elem[2];
72 353 av_tree_find(t->child[i], key, cmp, next_elem);
73 353 key = t->elem = next_elem[i];
74 353 v = -i;
75 } else {
76 549 *next = t;
77 549 *tp = NULL;
78 549 return NULL;
79 }
80 }
81 248683 ret = av_tree_insert(&t->child[v >> 31], key, cmp, next);
82
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248683 if (!ret) {
83 33728 int i = (v >> 31) ^ !!*next;
84 33728 AVTreeNode **child = &t->child[i];
85 33728 t->state += 2 * i - 1;
86
87
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33728 if (!(t->state & 1)) {
88
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12037 if (t->state) {
89 /* The following code is equivalent to
90 * if ((*child)->state * 2 == -t->state)
91 * rotate(child, i ^ 1);
92 * rotate(tp, i);
93 *
94 * with rotate():
95 * static void rotate(AVTreeNode **tp, int i)
96 * {
97 * AVTreeNode *t= *tp;
98 *
99 * *tp = t->child[i];
100 * t->child[i] = t->child[i]->child[i ^ 1];
101 * (*tp)->child[i ^ 1] = t;
102 * i = 4 * t->state + 2 * (*tp)->state + 12;
103 * t->state = ((0x614586 >> i) & 3) - 1;
104 * (*tp)->state = ((0x400EEA >> i) & 3) - 1 +
105 * ((*tp)->state >> 1);
106 * }
107 * but such a rotate function is both bigger and slower
108 */
109
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6557 if ((*child)->state * 2 == -t->state) {
110 2289 *tp = (*child)->child[i ^ 1];
111 2289 (*child)->child[i ^ 1] = (*tp)->child[i];
112 2289 (*tp)->child[i] = *child;
113 2289 *child = (*tp)->child[i ^ 1];
114 2289 (*tp)->child[i ^ 1] = t;
115
116 2289 (*tp)->child[0]->state = -((*tp)->state > 0);
117 2289 (*tp)->child[1]->state = (*tp)->state < 0;
118 2289 (*tp)->state = 0;
119 } else {
120 4268 *tp = *child;
121 4268 *child = (*child)->child[i ^ 1];
122 4268 (*tp)->child[i ^ 1] = t;
123
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4268 if ((*tp)->state)
124 4224 t->state = 0;
125 else
126 44 t->state >>= 1;
127 4268 (*tp)->state = -t->state;
128 }
129 }
130 }
131
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33728 if (!(*tp)->state ^ !!*next)
132 12015 return key;
133 }
134 236668 return ret;
135 } else {
136 24004 *tp = *next;
137 24004 *next = NULL;
138
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24004 if (*tp) {
139 14553 (*tp)->elem = key;
140 14553 return NULL;
141 } else
142 9451 return key;
143 }
144 }
145
146 30411 void av_tree_destroy(AVTreeNode *t)
147 {
148
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30411 if (t) {
149 14004 av_tree_destroy(t->child[0]);
150 14004 av_tree_destroy(t->child[1]);
151 14004 av_free(t);
152 }
153 30411 }
154
155 12482 void av_tree_enumerate(AVTreeNode *t, void *opaque,
156 int (*cmp)(void *opaque, void *elem),
157 int (*enu)(void *opaque, void *elem))
158 {
159
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12482 if (t) {
160
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5040 int v = cmp ? cmp(opaque, t->elem) : 0;
161
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5040 if (v >= 0)
162 5040 av_tree_enumerate(t->child[0], opaque, cmp, enu);
163
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5040 if (v == 0)
164 5040 enu(opaque, t->elem);
165
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5040 if (v <= 0)
166 5040 av_tree_enumerate(t->child[1], opaque, cmp, enu);
167 }
168 12482 }
169