aboutsummaryrefslogtreecommitdiffstats
path: root/libavutil/dict.c
blob: 3c3194c1bc3914f44f31ba2c73edd934e3d92552 (plain) (blame)
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
/*
 * copyright (c) 2009 Michael Niedermayer
 *
 * This file is part of Libav.
 *
 * Libav 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.
 *
 * Libav 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 Libav; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <ctype.h>
#include <string.h>

#include "avstring.h"
#include "dict.h"
#include "internal.h"
#include "mem.h"

struct AVDictionary {
    int count;
    AVDictionaryEntry *elems;
};

int av_dict_count(const AVDictionary *m)
{
    return m ? m->count : 0;
}

AVDictionaryEntry *
av_dict_get(AVDictionary *m, const char *key, const AVDictionaryEntry *prev, int flags)
{
    unsigned int i, j;

    if(!m)
        return NULL;

    if(prev) i= prev - m->elems + 1;
    else     i= 0;

    for(; i<m->count; i++){
        const char *s= m->elems[i].key;
        if(flags & AV_DICT_MATCH_CASE) for(j=0;         s[j]  ==         key[j]  && key[j]; j++);
        else                               for(j=0; toupper(s[j]) == toupper(key[j]) && key[j]; j++);
        if(key[j])
            continue;
        if(s[j] && !(flags & AV_DICT_IGNORE_SUFFIX))
            continue;
        return &m->elems[i];
    }
    return NULL;
}

int av_dict_set(AVDictionary **pm, const char *key, const char *value, int flags)
{
    AVDictionary      *m = *pm;
    AVDictionaryEntry *tag = av_dict_get(m, key, NULL, flags);
    char *oldval = NULL;

    if(!m)
        m = *pm = av_mallocz(sizeof(*m));

    if(tag) {
        if (flags & AV_DICT_DONT_OVERWRITE)
            return 0;
        if (flags & AV_DICT_APPEND)
            oldval = tag->value;
        else
            av_free(tag->value);
        av_free(tag->key);
        *tag = m->elems[--m->count];
    } else {
        AVDictionaryEntry *tmp = av_realloc(m->elems, (m->count+1) * sizeof(*m->elems));
        if(tmp) {
            m->elems = tmp;
        } else
            return AVERROR(ENOMEM);
    }
    if (value) {
        if (flags & AV_DICT_DONT_STRDUP_KEY) {
            m->elems[m->count].key  = key;
        } else
        m->elems[m->count].key  = av_strdup(key  );
        if (flags & AV_DICT_DONT_STRDUP_VAL) {
            m->elems[m->count].value = value;
        } else if (oldval && flags & AV_DICT_APPEND) {
            int len = strlen(oldval) + strlen(value) + 1;
            if (!(oldval = av_realloc(oldval, len)))
                return AVERROR(ENOMEM);
            av_strlcat(oldval, value, len);
            m->elems[m->count].value = oldval;
        } else
            m->elems[m->count].value = av_strdup(value);
        m->count++;
    }
    if (!m->count) {
        av_free(m->elems);
        av_freep(pm);
    }

    return 0;
}

void av_dict_free(AVDictionary **pm)
{
    AVDictionary *m = *pm;

    if (m) {
        while(m->count--) {
            av_free(m->elems[m->count].key);
            av_free(m->elems[m->count].value);
        }
        av_free(m->elems);
    }
    av_freep(pm);
}

void av_dict_copy(AVDictionary **dst, AVDictionary *src, int flags)
{
    AVDictionaryEntry *t = NULL;

    while ((t = av_dict_get(src, "", t, AV_DICT_IGNORE_SUFFIX)))
        av_dict_set(dst, t->key, t->value, flags);
}