Move metadata API from lavf to lavu.

Rename it to AVDictionary, since it will be used as such.  Tags
documentation and metadata conversion API is lavf-specific, so remains
there.

1 files changed, 110 insertions, 0 deletions

diff --git a/libavutil/dict.c b/libavutil/dict.c
new file mode 100644
index 0000000000..56f1513d32
--- /dev/null
+++ b/libavutil/dict.c
@@ -0,0 +1,110 @@
+/*
+ * copyright (c) 2009 Michael Niedermayer
+ *
+ * This file is part of Libav.
+ *
+ * Libav is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * Libav is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <strings.h>
+#include "dict.h"
+#include "internal.h"
+#include "mem.h"
+
+AVDictionaryEntry *
+av_dict_get(AVDictionary *m, const char *key, const AVDictionaryEntry *prev, int flags)
+{
+    unsigned int i, j;
+
+    if(!m)
+        return NULL;
+
+    if(prev) i= prev - m->elems + 1;
+    else     i= 0;
+
+    for(; i<m->count; i++){
+        const char *s= m->elems[i].key;
+        if(flags & AV_DICT_MATCH_CASE) for(j=0;         s[j]  ==         key[j]  && key[j]; j++);
+        else                               for(j=0; toupper(s[j]) == toupper(key[j]) && key[j]; j++);
+        if(key[j])
+            continue;
+        if(s[j] && !(flags & AV_DICT_IGNORE_SUFFIX))
+            continue;
+        return &m->elems[i];
+    }
+    return NULL;
+}
+
+int av_dict_set(AVDictionary **pm, const char *key, const char *value, int flags)
+{
+    AVDictionary      *m = *pm;
+    AVDictionaryEntry *tag = av_dict_get(m, key, NULL, flags);
+
+    if(!m)
+        m = *pm = av_mallocz(sizeof(*m));
+
+    if(tag) {
+        if (flags & AV_DICT_DONT_OVERWRITE)
+            return 0;
+        av_free(tag->value);
+        av_free(tag->key);
+        *tag = m->elems[--m->count];
+    } else {
+        AVDictionaryEntry *tmp = av_realloc(m->elems, (m->count+1) * sizeof(*m->elems));
+        if(tmp) {
+            m->elems = tmp;
+        } else
+            return AVERROR(ENOMEM);
+    }
+    if (value) {
+        if (flags & AV_DICT_DONT_STRDUP_KEY) {
+            m->elems[m->count].key  = key;
+        } else
+        m->elems[m->count].key  = av_strdup(key  );
+        if (flags & AV_DICT_DONT_STRDUP_VAL) {
+            m->elems[m->count].value = value;
+        } else
+            m->elems[m->count].value = av_strdup(value);
+        m->count++;
+    }
+    if (!m->count) {
+        av_free(m->elems);
+        av_freep(pm);
+    }
+
+    return 0;
+}
+
+void av_dict_free(AVDictionary **pm)
+{
+    AVDictionary *m = *pm;
+
+    if (m) {
+        while(m->count--) {
+            av_free(m->elems[m->count].key);
+            av_free(m->elems[m->count].value);
+        }
+        av_free(m->elems);
+    }
+    av_freep(pm);
+}
+
+void av_dict_copy(AVDictionary **dst, AVDictionary *src, int flags)
+{
+    AVDictionaryEntry *t = NULL;
+
+    while ((t = av_dict_get(src, "", t, AV_DICT_IGNORE_SUFFIX)))
+        av_dict_set(dst, t->key, t->value, flags);
+}