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path: root/libavutil/dict.c (plain)
blob: 0ea71386e5aeaaeae40dcf7b656b3e36872bc164
1/*
2 * copyright (c) 2009 Michael Niedermayer
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 <string.h>
22
23#include "avstring.h"
24#include "dict.h"
25#include "internal.h"
26#include "mem.h"
27#include "time_internal.h"
28#include "bprint.h"
29
30struct AVDictionary {
31 int count;
32 AVDictionaryEntry *elems;
33};
34
35int av_dict_count(const AVDictionary *m)
36{
37 return m ? m->count : 0;
38}
39
40AVDictionaryEntry *av_dict_get(const AVDictionary *m, const char *key,
41 const AVDictionaryEntry *prev, int flags)
42{
43 unsigned int i, j;
44
45 if (!m)
46 return NULL;
47
48 if (prev)
49 i = prev - m->elems + 1;
50 else
51 i = 0;
52
53 for (; i < m->count; i++) {
54 const char *s = m->elems[i].key;
55 if (flags & AV_DICT_MATCH_CASE)
56 for (j = 0; s[j] == key[j] && key[j]; j++)
57 ;
58 else
59 for (j = 0; av_toupper(s[j]) == av_toupper(key[j]) && key[j]; j++)
60 ;
61 if (key[j])
62 continue;
63 if (s[j] && !(flags & AV_DICT_IGNORE_SUFFIX))
64 continue;
65 return &m->elems[i];
66 }
67 return NULL;
68}
69
70int av_dict_set(AVDictionary **pm, const char *key, const char *value,
71 int flags)
72{
73 AVDictionary *m = *pm;
74 AVDictionaryEntry *tag = NULL;
75 char *oldval = NULL, *copy_key = NULL, *copy_value = NULL;
76
77 if (!(flags & AV_DICT_MULTIKEY)) {
78 tag = av_dict_get(m, key, NULL, flags);
79 }
80 if (flags & AV_DICT_DONT_STRDUP_KEY)
81 copy_key = (void *)key;
82 else
83 copy_key = av_strdup(key);
84 if (flags & AV_DICT_DONT_STRDUP_VAL)
85 copy_value = (void *)value;
86 else if (copy_key)
87 copy_value = av_strdup(value);
88 if (!m)
89 m = *pm = av_mallocz(sizeof(*m));
90 if (!m || (key && !copy_key) || (value && !copy_value))
91 goto err_out;
92
93 if (tag) {
94 if (flags & AV_DICT_DONT_OVERWRITE) {
95 av_free(copy_key);
96 av_free(copy_value);
97 return 0;
98 }
99 if (flags & AV_DICT_APPEND)
100 oldval = tag->value;
101 else
102 av_free(tag->value);
103 av_free(tag->key);
104 *tag = m->elems[--m->count];
105 } else if (copy_value) {
106 AVDictionaryEntry *tmp = av_realloc(m->elems,
107 (m->count + 1) * sizeof(*m->elems));
108 if (!tmp)
109 goto err_out;
110 m->elems = tmp;
111 }
112 if (copy_value) {
113 m->elems[m->count].key = copy_key;
114 m->elems[m->count].value = copy_value;
115 if (oldval && flags & AV_DICT_APPEND) {
116 size_t len = strlen(oldval) + strlen(copy_value) + 1;
117 char *newval = av_mallocz(len);
118 if (!newval)
119 goto err_out;
120 av_strlcat(newval, oldval, len);
121 av_freep(&oldval);
122 av_strlcat(newval, copy_value, len);
123 m->elems[m->count].value = newval;
124 av_freep(&copy_value);
125 }
126 m->count++;
127 } else {
128 av_freep(&copy_key);
129 }
130 if (!m->count) {
131 av_freep(&m->elems);
132 av_freep(pm);
133 }
134
135 return 0;
136
137err_out:
138 if (m && !m->count) {
139 av_freep(&m->elems);
140 av_freep(pm);
141 }
142 av_free(copy_key);
143 av_free(copy_value);
144 return AVERROR(ENOMEM);
145}
146
147int av_dict_set_int(AVDictionary **pm, const char *key, int64_t value,
148 int flags)
149{
150 char valuestr[22];
151 snprintf(valuestr, sizeof(valuestr), "%"PRId64, value);
152 flags &= ~AV_DICT_DONT_STRDUP_VAL;
153 return av_dict_set(pm, key, valuestr, flags);
154}
155
156static int parse_key_value_pair(AVDictionary **pm, const char **buf,
157 const char *key_val_sep, const char *pairs_sep,
158 int flags)
159{
160 char *key = av_get_token(buf, key_val_sep);
161 char *val = NULL;
162 int ret;
163
164 if (key && *key && strspn(*buf, key_val_sep)) {
165 (*buf)++;
166 val = av_get_token(buf, pairs_sep);
167 }
168
169 if (key && *key && val && *val)
170 ret = av_dict_set(pm, key, val, flags);
171 else
172 ret = AVERROR(EINVAL);
173
174 av_freep(&key);
175 av_freep(&val);
176
177 return ret;
178}
179
180int av_dict_parse_string(AVDictionary **pm, const char *str,
181 const char *key_val_sep, const char *pairs_sep,
182 int flags)
183{
184 int ret;
185
186 if (!str)
187 return 0;
188
189 /* ignore STRDUP flags */
190 flags &= ~(AV_DICT_DONT_STRDUP_KEY | AV_DICT_DONT_STRDUP_VAL);
191
192 while (*str) {
193 if ((ret = parse_key_value_pair(pm, &str, key_val_sep, pairs_sep, flags)) < 0)
194 return ret;
195
196 if (*str)
197 str++;
198 }
199
200 return 0;
201}
202
203void av_dict_free(AVDictionary **pm)
204{
205 AVDictionary *m = *pm;
206
207 if (m) {
208 while (m->count--) {
209 av_freep(&m->elems[m->count].key);
210 av_freep(&m->elems[m->count].value);
211 }
212 av_freep(&m->elems);
213 }
214 av_freep(pm);
215}
216
217int av_dict_copy(AVDictionary **dst, const AVDictionary *src, int flags)
218{
219 AVDictionaryEntry *t = NULL;
220
221 while ((t = av_dict_get(src, "", t, AV_DICT_IGNORE_SUFFIX))) {
222 int ret = av_dict_set(dst, t->key, t->value, flags);
223 if (ret < 0)
224 return ret;
225 }
226
227 return 0;
228}
229
230int av_dict_get_string(const AVDictionary *m, char **buffer,
231 const char key_val_sep, const char pairs_sep)
232{
233 AVDictionaryEntry *t = NULL;
234 AVBPrint bprint;
235 int cnt = 0;
236 char special_chars[] = {pairs_sep, key_val_sep, '\0'};
237
238 if (!buffer || pairs_sep == '\0' || key_val_sep == '\0' || pairs_sep == key_val_sep ||
239 pairs_sep == '\\' || key_val_sep == '\\')
240 return AVERROR(EINVAL);
241
242 if (!av_dict_count(m)) {
243 *buffer = av_strdup("");
244 return *buffer ? 0 : AVERROR(ENOMEM);
245 }
246
247 av_bprint_init(&bprint, 64, AV_BPRINT_SIZE_UNLIMITED);
248 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX))) {
249 if (cnt++)
250 av_bprint_append_data(&bprint, &pairs_sep, 1);
251 av_bprint_escape(&bprint, t->key, special_chars, AV_ESCAPE_MODE_BACKSLASH, 0);
252 av_bprint_append_data(&bprint, &key_val_sep, 1);
253 av_bprint_escape(&bprint, t->value, special_chars, AV_ESCAPE_MODE_BACKSLASH, 0);
254 }
255 return av_bprint_finalize(&bprint, buffer);
256}
257
258int avpriv_dict_set_timestamp(AVDictionary **dict, const char *key, int64_t timestamp)
259{
260 time_t seconds = timestamp / 1000000;
261 struct tm *ptm, tmbuf;
262 ptm = gmtime_r(&seconds, &tmbuf);
263 if (ptm) {
264 char buf[32];
265 if (!strftime(buf, sizeof(buf), "%Y-%m-%dT%H:%M:%S", ptm))
266 return AVERROR_EXTERNAL;
267 av_strlcatf(buf, sizeof(buf), ".%06dZ", (int)(timestamp % 1000000));
268 return av_dict_set(dict, key, buf, 0);
269 } else {
270 return AVERROR_EXTERNAL;
271 }
272}
273
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