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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" | |
27 | ||
28 | struct AVDictionary { | |
29 | int count; | |
30 | AVDictionaryEntry *elems; | |
31 | }; | |
32 | ||
33 | int av_dict_count(const AVDictionary *m) | |
34 | { | |
35 | return m ? m->count : 0; | |
36 | } | |
37 | ||
38 | AVDictionaryEntry *av_dict_get(FF_CONST_AVUTIL53 AVDictionary *m, const char *key, | |
39 | const AVDictionaryEntry *prev, int flags) | |
40 | { | |
41 | unsigned int i, j; | |
42 | ||
43 | if (!m) | |
44 | return NULL; | |
45 | ||
46 | if (prev) | |
47 | i = prev - m->elems + 1; | |
48 | else | |
49 | i = 0; | |
50 | ||
51 | for (; i < m->count; i++) { | |
52 | const char *s = m->elems[i].key; | |
53 | if (flags & AV_DICT_MATCH_CASE) | |
54 | for (j = 0; s[j] == key[j] && key[j]; j++) | |
55 | ; | |
56 | else | |
57 | for (j = 0; av_toupper(s[j]) == av_toupper(key[j]) && key[j]; j++) | |
58 | ; | |
59 | if (key[j]) | |
60 | continue; | |
61 | if (s[j] && !(flags & AV_DICT_IGNORE_SUFFIX)) | |
62 | continue; | |
63 | return &m->elems[i]; | |
64 | } | |
65 | return NULL; | |
66 | } | |
67 | ||
68 | int av_dict_set(AVDictionary **pm, const char *key, const char *value, | |
69 | int flags) | |
70 | { | |
71 | AVDictionary *m = *pm; | |
72 | AVDictionaryEntry *tag = av_dict_get(m, key, NULL, flags); | |
73 | char *oldval = NULL; | |
74 | ||
75 | if (!m) | |
76 | m = *pm = av_mallocz(sizeof(*m)); | |
77 | ||
78 | if (tag) { | |
79 | if (flags & AV_DICT_DONT_OVERWRITE) { | |
80 | if (flags & AV_DICT_DONT_STRDUP_KEY) av_free((void*)key); | |
81 | if (flags & AV_DICT_DONT_STRDUP_VAL) av_free((void*)value); | |
82 | return 0; | |
83 | } | |
84 | if (flags & AV_DICT_APPEND) | |
85 | oldval = tag->value; | |
86 | else | |
87 | av_free(tag->value); | |
88 | av_free(tag->key); | |
89 | *tag = m->elems[--m->count]; | |
90 | } else { | |
91 | AVDictionaryEntry *tmp = av_realloc(m->elems, | |
92 | (m->count + 1) * sizeof(*m->elems)); | |
93 | if (!tmp) | |
94 | goto err_out; | |
95 | m->elems = tmp; | |
96 | } | |
97 | if (value) { | |
98 | if (flags & AV_DICT_DONT_STRDUP_KEY) | |
99 | m->elems[m->count].key = (char*)(intptr_t)key; | |
100 | else | |
101 | m->elems[m->count].key = av_strdup(key); | |
102 | if (flags & AV_DICT_DONT_STRDUP_VAL) { | |
103 | m->elems[m->count].value = (char*)(intptr_t)value; | |
104 | } else if (oldval && flags & AV_DICT_APPEND) { | |
105 | int len = strlen(oldval) + strlen(value) + 1; | |
106 | char *newval = av_mallocz(len); | |
107 | if (!newval) | |
108 | goto err_out; | |
109 | av_strlcat(newval, oldval, len); | |
110 | av_freep(&oldval); | |
111 | av_strlcat(newval, value, len); | |
112 | m->elems[m->count].value = newval; | |
113 | } else | |
114 | m->elems[m->count].value = av_strdup(value); | |
115 | m->count++; | |
116 | } | |
117 | if (!m->count) { | |
118 | av_free(m->elems); | |
119 | av_freep(pm); | |
120 | } | |
121 | ||
122 | return 0; | |
123 | ||
124 | err_out: | |
125 | if (!m->count) { | |
126 | av_free(m->elems); | |
127 | av_freep(pm); | |
128 | } | |
129 | if (flags & AV_DICT_DONT_STRDUP_KEY) av_free((void*)key); | |
130 | if (flags & AV_DICT_DONT_STRDUP_VAL) av_free((void*)value); | |
131 | return AVERROR(ENOMEM); | |
132 | } | |
133 | ||
134 | int av_dict_set_int(AVDictionary **pm, const char *key, int64_t value, | |
135 | int flags) | |
136 | { | |
137 | char valuestr[22]; | |
138 | snprintf(valuestr, sizeof(valuestr), "%"PRId64, value); | |
139 | return av_dict_set(pm, key, valuestr, flags); | |
140 | } | |
141 | ||
142 | static int parse_key_value_pair(AVDictionary **pm, const char **buf, | |
143 | const char *key_val_sep, const char *pairs_sep, | |
144 | int flags) | |
145 | { | |
146 | char *key = av_get_token(buf, key_val_sep); | |
147 | char *val = NULL; | |
148 | int ret; | |
149 | ||
150 | if (key && *key && strspn(*buf, key_val_sep)) { | |
151 | (*buf)++; | |
152 | val = av_get_token(buf, pairs_sep); | |
153 | } | |
154 | ||
155 | if (key && *key && val && *val) | |
156 | ret = av_dict_set(pm, key, val, flags); | |
157 | else | |
158 | ret = AVERROR(EINVAL); | |
159 | ||
160 | av_freep(&key); | |
161 | av_freep(&val); | |
162 | ||
163 | return ret; | |
164 | } | |
165 | ||
166 | int av_dict_parse_string(AVDictionary **pm, const char *str, | |
167 | const char *key_val_sep, const char *pairs_sep, | |
168 | int flags) | |
169 | { | |
170 | int ret; | |
171 | ||
172 | if (!str) | |
173 | return 0; | |
174 | ||
175 | /* ignore STRDUP flags */ | |
176 | flags &= ~(AV_DICT_DONT_STRDUP_KEY | AV_DICT_DONT_STRDUP_VAL); | |
177 | ||
178 | while (*str) { | |
179 | if ((ret = parse_key_value_pair(pm, &str, key_val_sep, pairs_sep, flags)) < 0) | |
180 | return ret; | |
181 | ||
182 | if (*str) | |
183 | str++; | |
184 | } | |
185 | ||
186 | return 0; | |
187 | } | |
188 | ||
189 | void av_dict_free(AVDictionary **pm) | |
190 | { | |
191 | AVDictionary *m = *pm; | |
192 | ||
193 | if (m) { | |
194 | while (m->count--) { | |
195 | av_free(m->elems[m->count].key); | |
196 | av_free(m->elems[m->count].value); | |
197 | } | |
198 | av_free(m->elems); | |
199 | } | |
200 | av_freep(pm); | |
201 | } | |
202 | ||
203 | void av_dict_copy(AVDictionary **dst, FF_CONST_AVUTIL53 AVDictionary *src, int flags) | |
204 | { | |
205 | AVDictionaryEntry *t = NULL; | |
206 | ||
207 | while ((t = av_dict_get(src, "", t, AV_DICT_IGNORE_SUFFIX))) | |
208 | av_dict_set(dst, t->key, t->value, flags); | |
209 | } |