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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" | |
f6fa7814 | 27 | #include "bprint.h" |
2ba45a60 DM |
28 | |
29 | struct AVDictionary { | |
30 | int count; | |
31 | AVDictionaryEntry *elems; | |
32 | }; | |
33 | ||
34 | int av_dict_count(const AVDictionary *m) | |
35 | { | |
36 | return m ? m->count : 0; | |
37 | } | |
38 | ||
f6fa7814 | 39 | AVDictionaryEntry *av_dict_get(const AVDictionary *m, const char *key, |
2ba45a60 DM |
40 | const AVDictionaryEntry *prev, int flags) |
41 | { | |
42 | unsigned int i, j; | |
43 | ||
44 | if (!m) | |
45 | return NULL; | |
46 | ||
47 | if (prev) | |
48 | i = prev - m->elems + 1; | |
49 | else | |
50 | i = 0; | |
51 | ||
52 | for (; i < m->count; i++) { | |
53 | const char *s = m->elems[i].key; | |
54 | if (flags & AV_DICT_MATCH_CASE) | |
55 | for (j = 0; s[j] == key[j] && key[j]; j++) | |
56 | ; | |
57 | else | |
58 | for (j = 0; av_toupper(s[j]) == av_toupper(key[j]) && key[j]; j++) | |
59 | ; | |
60 | if (key[j]) | |
61 | continue; | |
62 | if (s[j] && !(flags & AV_DICT_IGNORE_SUFFIX)) | |
63 | continue; | |
64 | return &m->elems[i]; | |
65 | } | |
66 | return NULL; | |
67 | } | |
68 | ||
69 | int av_dict_set(AVDictionary **pm, const char *key, const char *value, | |
70 | int flags) | |
71 | { | |
72 | AVDictionary *m = *pm; | |
73 | AVDictionaryEntry *tag = av_dict_get(m, key, NULL, flags); | |
74 | char *oldval = NULL; | |
75 | ||
76 | if (!m) | |
77 | m = *pm = av_mallocz(sizeof(*m)); | |
78 | ||
79 | if (tag) { | |
80 | if (flags & AV_DICT_DONT_OVERWRITE) { | |
81 | if (flags & AV_DICT_DONT_STRDUP_KEY) av_free((void*)key); | |
82 | if (flags & AV_DICT_DONT_STRDUP_VAL) av_free((void*)value); | |
83 | return 0; | |
84 | } | |
85 | if (flags & AV_DICT_APPEND) | |
86 | oldval = tag->value; | |
87 | else | |
88 | av_free(tag->value); | |
89 | av_free(tag->key); | |
90 | *tag = m->elems[--m->count]; | |
91 | } else { | |
92 | AVDictionaryEntry *tmp = av_realloc(m->elems, | |
93 | (m->count + 1) * sizeof(*m->elems)); | |
94 | if (!tmp) | |
95 | goto err_out; | |
96 | m->elems = tmp; | |
97 | } | |
98 | if (value) { | |
99 | if (flags & AV_DICT_DONT_STRDUP_KEY) | |
100 | m->elems[m->count].key = (char*)(intptr_t)key; | |
101 | else | |
102 | m->elems[m->count].key = av_strdup(key); | |
103 | if (flags & AV_DICT_DONT_STRDUP_VAL) { | |
104 | m->elems[m->count].value = (char*)(intptr_t)value; | |
105 | } else if (oldval && flags & AV_DICT_APPEND) { | |
106 | int len = strlen(oldval) + strlen(value) + 1; | |
107 | char *newval = av_mallocz(len); | |
108 | if (!newval) | |
109 | goto err_out; | |
110 | av_strlcat(newval, oldval, len); | |
111 | av_freep(&oldval); | |
112 | av_strlcat(newval, value, len); | |
113 | m->elems[m->count].value = newval; | |
114 | } else | |
115 | m->elems[m->count].value = av_strdup(value); | |
116 | m->count++; | |
117 | } | |
118 | if (!m->count) { | |
119 | av_free(m->elems); | |
120 | av_freep(pm); | |
121 | } | |
122 | ||
123 | return 0; | |
124 | ||
125 | err_out: | |
126 | if (!m->count) { | |
127 | av_free(m->elems); | |
128 | av_freep(pm); | |
129 | } | |
130 | if (flags & AV_DICT_DONT_STRDUP_KEY) av_free((void*)key); | |
131 | if (flags & AV_DICT_DONT_STRDUP_VAL) av_free((void*)value); | |
132 | return AVERROR(ENOMEM); | |
133 | } | |
134 | ||
135 | int av_dict_set_int(AVDictionary **pm, const char *key, int64_t value, | |
136 | int flags) | |
137 | { | |
138 | char valuestr[22]; | |
139 | snprintf(valuestr, sizeof(valuestr), "%"PRId64, value); | |
140 | return av_dict_set(pm, key, valuestr, flags); | |
141 | } | |
142 | ||
143 | static int parse_key_value_pair(AVDictionary **pm, const char **buf, | |
144 | const char *key_val_sep, const char *pairs_sep, | |
145 | int flags) | |
146 | { | |
147 | char *key = av_get_token(buf, key_val_sep); | |
148 | char *val = NULL; | |
149 | int ret; | |
150 | ||
151 | if (key && *key && strspn(*buf, key_val_sep)) { | |
152 | (*buf)++; | |
153 | val = av_get_token(buf, pairs_sep); | |
154 | } | |
155 | ||
156 | if (key && *key && val && *val) | |
157 | ret = av_dict_set(pm, key, val, flags); | |
158 | else | |
159 | ret = AVERROR(EINVAL); | |
160 | ||
161 | av_freep(&key); | |
162 | av_freep(&val); | |
163 | ||
164 | return ret; | |
165 | } | |
166 | ||
167 | int av_dict_parse_string(AVDictionary **pm, const char *str, | |
168 | const char *key_val_sep, const char *pairs_sep, | |
169 | int flags) | |
170 | { | |
171 | int ret; | |
172 | ||
173 | if (!str) | |
174 | return 0; | |
175 | ||
176 | /* ignore STRDUP flags */ | |
177 | flags &= ~(AV_DICT_DONT_STRDUP_KEY | AV_DICT_DONT_STRDUP_VAL); | |
178 | ||
179 | while (*str) { | |
180 | if ((ret = parse_key_value_pair(pm, &str, key_val_sep, pairs_sep, flags)) < 0) | |
181 | return ret; | |
182 | ||
183 | if (*str) | |
184 | str++; | |
185 | } | |
186 | ||
187 | return 0; | |
188 | } | |
189 | ||
190 | void av_dict_free(AVDictionary **pm) | |
191 | { | |
192 | AVDictionary *m = *pm; | |
193 | ||
194 | if (m) { | |
195 | while (m->count--) { | |
196 | av_free(m->elems[m->count].key); | |
197 | av_free(m->elems[m->count].value); | |
198 | } | |
199 | av_free(m->elems); | |
200 | } | |
201 | av_freep(pm); | |
202 | } | |
203 | ||
f6fa7814 | 204 | void av_dict_copy(AVDictionary **dst, const AVDictionary *src, int flags) |
2ba45a60 DM |
205 | { |
206 | AVDictionaryEntry *t = NULL; | |
207 | ||
208 | while ((t = av_dict_get(src, "", t, AV_DICT_IGNORE_SUFFIX))) | |
209 | av_dict_set(dst, t->key, t->value, flags); | |
210 | } | |
f6fa7814 DM |
211 | |
212 | int av_dict_get_string(const AVDictionary *m, char **buffer, | |
213 | const char key_val_sep, const char pairs_sep) | |
214 | { | |
215 | AVDictionaryEntry *t = NULL; | |
216 | AVBPrint bprint; | |
217 | int cnt = 0; | |
218 | char special_chars[] = {pairs_sep, key_val_sep, '\0'}; | |
219 | ||
220 | if (!buffer || pairs_sep == '\0' || key_val_sep == '\0' || pairs_sep == key_val_sep || | |
221 | pairs_sep == '\\' || key_val_sep == '\\') | |
222 | return AVERROR(EINVAL); | |
223 | ||
224 | if (!av_dict_count(m)) { | |
225 | *buffer = av_strdup(""); | |
226 | return *buffer ? 0 : AVERROR(ENOMEM); | |
227 | } | |
228 | ||
229 | av_bprint_init(&bprint, 64, AV_BPRINT_SIZE_UNLIMITED); | |
230 | while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX))) { | |
231 | if (cnt++) | |
232 | av_bprint_append_data(&bprint, &pairs_sep, 1); | |
233 | av_bprint_escape(&bprint, t->key, special_chars, AV_ESCAPE_MODE_BACKSLASH, 0); | |
234 | av_bprint_append_data(&bprint, &key_val_sep, 1); | |
235 | av_bprint_escape(&bprint, t->value, special_chars, AV_ESCAPE_MODE_BACKSLASH, 0); | |
236 | } | |
237 | return av_bprint_finalize(&bprint, buffer); | |
238 | } | |
239 | ||
240 | #ifdef TEST | |
241 | static void print_dict(const AVDictionary *m) | |
242 | { | |
243 | AVDictionaryEntry *t = NULL; | |
244 | while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX))) | |
245 | printf("%s %s ", t->key, t->value); | |
246 | printf("\n"); | |
247 | } | |
248 | ||
249 | static void test_separators(const AVDictionary *m, const char pair, const char val) | |
250 | { | |
251 | AVDictionary *dict = NULL; | |
252 | char pairs[] = {pair , '\0'}; | |
253 | char vals[] = {val, '\0'}; | |
254 | ||
255 | char *buffer = NULL; | |
256 | av_dict_copy(&dict, m, 0); | |
257 | print_dict(dict); | |
258 | av_dict_get_string(dict, &buffer, val, pair); | |
259 | printf("%s\n", buffer); | |
260 | av_dict_free(&dict); | |
261 | av_dict_parse_string(&dict, buffer, vals, pairs, 0); | |
262 | av_freep(&buffer); | |
263 | print_dict(dict); | |
264 | av_dict_free(&dict); | |
265 | } | |
266 | ||
267 | int main(void) | |
268 | { | |
269 | AVDictionary *dict = NULL; | |
270 | char *buffer = NULL; | |
271 | ||
272 | printf("Testing av_dict_get_string() and av_dict_parse_string()\n"); | |
273 | av_dict_get_string(dict, &buffer, '=', ','); | |
274 | printf("%s\n", buffer); | |
275 | av_freep(&buffer); | |
276 | av_dict_set(&dict, "aaa", "aaa", 0); | |
277 | av_dict_set(&dict, "b,b", "bbb", 0); | |
278 | av_dict_set(&dict, "c=c", "ccc", 0); | |
279 | av_dict_set(&dict, "ddd", "d,d", 0); | |
280 | av_dict_set(&dict, "eee", "e=e", 0); | |
281 | av_dict_set(&dict, "f,f", "f=f", 0); | |
282 | av_dict_set(&dict, "g=g", "g,g", 0); | |
283 | test_separators(dict, ',', '='); | |
284 | av_dict_free(&dict); | |
285 | av_dict_set(&dict, "aaa", "aaa", 0); | |
286 | av_dict_set(&dict, "bbb", "bbb", 0); | |
287 | av_dict_set(&dict, "ccc", "ccc", 0); | |
288 | av_dict_set(&dict, "\\,=\'\"", "\\,=\'\"", 0); | |
289 | test_separators(dict, '"', '='); | |
290 | test_separators(dict, '\'', '='); | |
291 | test_separators(dict, ',', '"'); | |
292 | test_separators(dict, ',', '\''); | |
293 | test_separators(dict, '\'', '"'); | |
294 | test_separators(dict, '"', '\''); | |
295 | av_dict_free(&dict); | |
296 | ||
297 | return 0; | |
298 | } | |
299 | #endif |