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libavutil/dict.c

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00001 /*
00002  * copyright (c) 2009 Michael Niedermayer
00003  *
00004  * This file is part of FFmpeg.
00005  *
00006  * FFmpeg is free software; you can redistribute it and/or
00007  * modify it under the terms of the GNU Lesser General Public
00008  * License as published by the Free Software Foundation; either
00009  * version 2.1 of the License, or (at your option) any later version.
00010  *
00011  * FFmpeg is distributed in the hope that it will be useful,
00012  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00013  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014  * Lesser General Public License for more details.
00015  *
00016  * You should have received a copy of the GNU Lesser General Public
00017  * License along with FFmpeg; if not, write to the Free Software
00018  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00019  */
00020 
00021 #include <strings.h>
00022 #include "avstring.h"
00023 #include "dict.h"
00024 #include "internal.h"
00025 #include "mem.h"
00026 
00027 AVDictionaryEntry *
00028 av_dict_get(AVDictionary *m, const char *key, const AVDictionaryEntry *prev, int flags)
00029 {
00030     unsigned int i, j;
00031 
00032     if(!m)
00033         return NULL;
00034 
00035     if(prev) i= prev - m->elems + 1;
00036     else     i= 0;
00037 
00038     for(; i<m->count; i++){
00039         const char *s= m->elems[i].key;
00040         if(flags & AV_DICT_MATCH_CASE) for(j=0;         s[j]  ==         key[j]  && key[j]; j++);
00041         else                               for(j=0; toupper(s[j]) == toupper(key[j]) && key[j]; j++);
00042         if(key[j])
00043             continue;
00044         if(s[j] && !(flags & AV_DICT_IGNORE_SUFFIX))
00045             continue;
00046         return &m->elems[i];
00047     }
00048     return NULL;
00049 }
00050 
00051 int av_dict_set(AVDictionary **pm, const char *key, const char *value, int flags)
00052 {
00053     AVDictionary      *m = *pm;
00054     AVDictionaryEntry *tag = av_dict_get(m, key, NULL, flags);
00055     char *oldval = NULL;
00056 
00057     if(!m)
00058         m = *pm = av_mallocz(sizeof(*m));
00059 
00060     if(tag) {
00061         if (flags & AV_DICT_DONT_OVERWRITE)
00062             return 0;
00063         if (flags & AV_DICT_APPEND)
00064             oldval = tag->value;
00065         else
00066             av_free(tag->value);
00067         av_free(tag->key);
00068         *tag = m->elems[--m->count];
00069     } else {
00070         AVDictionaryEntry *tmp = av_realloc(m->elems, (m->count+1) * sizeof(*m->elems));
00071         if(tmp) {
00072             m->elems = tmp;
00073         } else
00074             return AVERROR(ENOMEM);
00075     }
00076     if (value) {
00077         if (flags & AV_DICT_DONT_STRDUP_KEY) {
00078             m->elems[m->count].key  = key;
00079         } else
00080         m->elems[m->count].key  = av_strdup(key  );
00081         if (flags & AV_DICT_DONT_STRDUP_VAL) {
00082             m->elems[m->count].value = value;
00083         } else if (oldval && flags & AV_DICT_APPEND) {
00084             int len = strlen(oldval) + strlen(value) + 1;
00085             if (!(oldval = av_realloc(oldval, len)))
00086                 return AVERROR(ENOMEM);
00087             av_strlcat(oldval, value, len);
00088             m->elems[m->count].value = oldval;
00089         } else
00090             m->elems[m->count].value = av_strdup(value);
00091         m->count++;
00092     }
00093     if (!m->count) {
00094         av_free(m->elems);
00095         av_freep(pm);
00096     }
00097 
00098     return 0;
00099 }
00100 
00101 void av_dict_free(AVDictionary **pm)
00102 {
00103     AVDictionary *m = *pm;
00104 
00105     if (m) {
00106         while(m->count--) {
00107             av_free(m->elems[m->count].key);
00108             av_free(m->elems[m->count].value);
00109         }
00110         av_free(m->elems);
00111     }
00112     av_freep(pm);
00113 }
00114 
00115 void av_dict_copy(AVDictionary **dst, AVDictionary *src, int flags)
00116 {
00117     AVDictionaryEntry *t = NULL;
00118 
00119     while ((t = av_dict_get(src, "", t, AV_DICT_IGNORE_SUFFIX)))
00120         av_dict_set(dst, t->key, t->value, flags);
00121 }

Generated on Wed Apr 11 2012 07:31:37 for FFmpeg by  doxygen 1.7.1