| 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 | } |