FFmpeg: libavutil/dict.c Source File

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libavutil

dict.c

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1 /*

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 */

21 #include <string.h>

23 #include "avstring.h"

24 #include "dict.h"

25 #include "internal.h"

26 #include "mem.h"

28 struct AVDictionary {

29 int count;

30 AVDictionaryEntry *elems;

31 };

33 int av_dict_count(const AVDictionary *m)

34 {

35 return m ? m->count : 0;

36 }

38 AVDictionaryEntry *

39 av_dict_get(AVDictionary *m, const char *key, const AVDictionaryEntry *prev, int flags)

40 {

41 unsigned int i, j;

43 if(!m)

44 return NULL;

46 if(prev) i= prev - m->elems + 1;

47 else i= 0;

49 for(; i<m->count; i++){

50 const char *s= m->elems[i].key;

51 if(flags & AV_DICT_MATCH_CASE) for(j=0; s[j] == key[j] && key[j]; j++);

52 else for(j=0; av_toupper(s[j]) == av_toupper(key[j]) && key[j]; j++);

53 if(key[j])

54 continue;

55 if(s[j] && !(flags & AV_DICT_IGNORE_SUFFIX))

56 continue;

57 return &m->elems[i];

58 }

59 return NULL;

60 }

62 int av_dict_set(AVDictionary **pm, const char *key, const char *value, int flags)

63 {

64 AVDictionary *m = *pm;

65 AVDictionaryEntry *tag = av_dict_get(m, key, NULL, flags);

66 char *oldval = NULL;

68 if(!m)

69 m = *pm = av_mallocz(sizeof(*m));

71 if(tag) {

72 if (flags & AV_DICT_DONT_OVERWRITE)

73 return 0;

74 if (flags & AV_DICT_APPEND)

75 oldval = tag->value;

76 else

77 av_free(tag->value);

78 av_free(tag->key);

79 *tag = m->elems[--m->count];

80 } else {

81 AVDictionaryEntry *tmp = av_realloc(m->elems, (m->count+1) * sizeof(*m->elems));

82 if(tmp) {

83 m->elems = tmp;

84 } else

85 return AVERROR(ENOMEM);

86 }

87 if (value) {

88 if (flags & AV_DICT_DONT_STRDUP_KEY) {

89 m->elems[m->count].key = (char*)(intptr_t)key;

90 } else

91 m->elems[m->count].key = av_strdup(key);

92 if (flags & AV_DICT_DONT_STRDUP_VAL) {

93 m->elems[m->count].value = (char*)(intptr_t)value;

94 } else if (oldval && flags & AV_DICT_APPEND) {

95 int len = strlen(oldval) + strlen(value) + 1;

96 char *newval = av_mallocz(len);

97 if (!newval)

98 return AVERROR(ENOMEM);

99 av_strlcat(newval, oldval, len);

100 av_freep(&oldval);

101 av_strlcat(newval, value, len);

102 m->elems[m->count].value = newval;

103 } else

104 m->elems[m->count].value = av_strdup(value);

105 m->count++;

106 }

107 if (!m->count) {

108 av_free(m->elems);

109 av_freep(pm);

110 }

111

112 return 0;

113 }

114

115 static int parse_key_value_pair(AVDictionary **pm, const char **buf,

116 const char *key_val_sep, const char *pairs_sep,

117 int flags)

118 {

119 char *key = av_get_token(buf, key_val_sep);

120 char *val = NULL;

121 int ret;

122

123 if (key && *key && strspn(*buf, key_val_sep)) {

124 (*buf)++;

125 val = av_get_token(buf, pairs_sep);

126 }

127

128 if (key && *key && val && *val)

129 ret = av_dict_set(pm, key, val, flags);

130 else

131 ret = AVERROR(EINVAL);

132

133 av_freep(&key);

134 av_freep(&val);

135

136 return ret;

137 }

138

139 int av_dict_parse_string(AVDictionary **pm, const char *str,

140 const char *key_val_sep, const char *pairs_sep,

141 int flags)

142 {

143 int ret;

144

145 if (!str)

146 return 0;

147

148 /* ignore STRDUP flags */

149 flags &= ~(AV_DICT_DONT_STRDUP_KEY | AV_DICT_DONT_STRDUP_VAL);

150

151 while (*str) {

152 if ((ret = parse_key_value_pair(pm, &str, key_val_sep, pairs_sep, flags)) < 0)

153 return ret;

154

155 if (*str)

156 str++;

157 }

158

159 return 0;

160 }

161

162 void av_dict_free(AVDictionary **pm)

163 {

164 AVDictionary *m = *pm;

165

166 if (m) {

167 while(m->count--) {

168 av_free(m->elems[m->count].key);

169 av_free(m->elems[m->count].value);

170 }

171 av_free(m->elems);

172 }

173 av_freep(pm);

174 }

175

176 void av_dict_copy(AVDictionary **dst, AVDictionary *src, int flags)

177 {

178 AVDictionaryEntry *t = NULL;

179

180 while ((t = av_dict_get(src, "", t, AV_DICT_IGNORE_SUFFIX)))

181 av_dict_set(dst, t->key, t->value, flags);

182 }

Generated on Wed Jul 10 2013 23:48:15 for FFmpeg by doxygen 1.8.2