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
26AVDictionaryEntry *
27av_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
50int 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
100void av_dict_free(AVDictionary **pm)
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
114void av_dict_copy(AVDictionary **dst, AVDictionary *src, int flags)
115{
116    AVDictionaryEntry *t = NULL;
117
118    while ((t = av_dict_get(src, "", t, AV_DICT_IGNORE_SUFFIX)))
119        av_dict_set(dst, t->key, t->value, flags);
120}
121