56f1513d32283224cc9377670a133682b823b588
[libav.git] / libavutil / dict.c
1 /*
2 * copyright (c) 2009 Michael Niedermayer
3 *
4 * This file is part of Libav.
5 *
6 * Libav 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 * Libav 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 Libav; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #include <strings.h>
22 #include "dict.h"
23 #include "internal.h"
24 #include "mem.h"
25
26 AVDictionaryEntry *
27 av_dict_get(AVDictionary *m, const char *key, const AVDictionaryEntry *prev, int flags)
28 {
29 unsigned int i, j;
30
31 if(!m)
32 return NULL;
33
34 if(prev) i= prev - m->elems + 1;
35 else i= 0;
36
37 for(; i<m->count; i++){
38 const char *s= m->elems[i].key;
39 if(flags & AV_DICT_MATCH_CASE) for(j=0; s[j] == key[j] && key[j]; j++);
40 else for(j=0; toupper(s[j]) == toupper(key[j]) && key[j]; j++);
41 if(key[j])
42 continue;
43 if(s[j] && !(flags & AV_DICT_IGNORE_SUFFIX))
44 continue;
45 return &m->elems[i];
46 }
47 return NULL;
48 }
49
50 int av_dict_set(AVDictionary **pm, const char *key, const char *value, int flags)
51 {
52 AVDictionary *m = *pm;
53 AVDictionaryEntry *tag = av_dict_get(m, key, NULL, flags);
54
55 if(!m)
56 m = *pm = av_mallocz(sizeof(*m));
57
58 if(tag) {
59 if (flags & AV_DICT_DONT_OVERWRITE)
60 return 0;
61 av_free(tag->value);
62 av_free(tag->key);
63 *tag = m->elems[--m->count];
64 } else {
65 AVDictionaryEntry *tmp = av_realloc(m->elems, (m->count+1) * sizeof(*m->elems));
66 if(tmp) {
67 m->elems = tmp;
68 } else
69 return AVERROR(ENOMEM);
70 }
71 if (value) {
72 if (flags & AV_DICT_DONT_STRDUP_KEY) {
73 m->elems[m->count].key = key;
74 } else
75 m->elems[m->count].key = av_strdup(key );
76 if (flags & AV_DICT_DONT_STRDUP_VAL) {
77 m->elems[m->count].value = value;
78 } else
79 m->elems[m->count].value = av_strdup(value);
80 m->count++;
81 }
82 if (!m->count) {
83 av_free(m->elems);
84 av_freep(pm);
85 }
86
87 return 0;
88 }
89
90 void av_dict_free(AVDictionary **pm)
91 {
92 AVDictionary *m = *pm;
93
94 if (m) {
95 while(m->count--) {
96 av_free(m->elems[m->count].key);
97 av_free(m->elems[m->count].value);
98 }
99 av_free(m->elems);
100 }
101 av_freep(pm);
102 }
103
104 void av_dict_copy(AVDictionary **dst, AVDictionary *src, int flags)
105 {
106 AVDictionaryEntry *t = NULL;
107
108 while ((t = av_dict_get(src, "", t, AV_DICT_IGNORE_SUFFIX)))
109 av_dict_set(dst, t->key, t->value, flags);
110 }