| 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 "bprint.h" |
| 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 | |
| 39 | AVDictionaryEntry *av_dict_get(const AVDictionary *m, const char *key, |
| 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 | |
| 204 | void av_dict_copy(AVDictionary **dst, const AVDictionary *src, int flags) |
| 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 | } |
| 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 |