dict.c
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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 "avstring.h"
22 #include "dict.h"
23 #include "internal.h"
24 #include "mem.h"
25 
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  char *oldval = NULL;
55 
56  if(!m)
57  m = *pm = av_mallocz(sizeof(*m));
58 
59  if(tag) {
60  if (flags & AV_DICT_DONT_OVERWRITE)
61  return 0;
62  if (flags & AV_DICT_APPEND)
63  oldval = tag->value;
64  else
65  av_free(tag->value);
66  av_free(tag->key);
67  *tag = m->elems[--m->count];
68  } else {
69  AVDictionaryEntry *tmp = av_realloc(m->elems, (m->count+1) * sizeof(*m->elems));
70  if(tmp) {
71  m->elems = tmp;
72  } else
73  return AVERROR(ENOMEM);
74  }
75  if (value) {
76  if (flags & AV_DICT_DONT_STRDUP_KEY) {
77  m->elems[m->count].key = key;
78  } else
79  m->elems[m->count].key = av_strdup(key );
80  if (flags & AV_DICT_DONT_STRDUP_VAL) {
81  m->elems[m->count].value = value;
82  } else if (oldval && flags & AV_DICT_APPEND) {
83  int len = strlen(oldval) + strlen(value) + 1;
84  if (!(oldval = av_realloc(oldval, len)))
85  return AVERROR(ENOMEM);
86  av_strlcat(oldval, value, len);
87  m->elems[m->count].value = oldval;
88  } else
89  m->elems[m->count].value = av_strdup(value);
90  m->count++;
91  }
92  if (!m->count) {
93  av_free(m->elems);
94  av_freep(pm);
95  }
96 
97  return 0;
98 }
99 
101 {
102  AVDictionary *m = *pm;
103 
104  if (m) {
105  while(m->count--) {
106  av_free(m->elems[m->count].key);
107  av_free(m->elems[m->count].value);
108  }
109  av_free(m->elems);
110  }
111  av_freep(pm);
112 }
113 
115 {
117 
118  while ((t = av_dict_get(src, "", t, AV_DICT_IGNORE_SUFFIX)))
119  av_dict_set(dst, t->key, t->value, flags);
120 }