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ffmpeg / libavformat / metadata.c @ 4815e246

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/*
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 * copyright (c) 2009 Michael Niedermayer
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#include "metadata.h"
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AVMetadataTag *
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av_metadata_get(AVMetadata *m, const char *key, const AVMetadataTag *prev, int flags)
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{
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    unsigned int i, j;
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    if(!m)
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        return NULL;
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    if(prev) i= prev - m->elems + 1;
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    else     i= 0;
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    for(; i<m->count; i++){
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        const char *s= m->elems[i].key;
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        if(flags & AV_METADATA_MATCH_CASE) for(j=0;         s[j]  ==         key[j]  && key[j]; j++);
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        else                               for(j=0; toupper(s[j]) == toupper(key[j]) && key[j]; j++);
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        if(key[j])
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            continue;
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        if(s[j] && !(flags & AV_METADATA_IGNORE_SUFFIX))
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            continue;
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        return &m->elems[i];
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    }
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    return NULL;
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}
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int av_metadata_set(AVMetadata **pm, AVMetadataTag elem)
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{
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    AVMetadata *m= *pm;
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    AVMetadataTag *tag= av_metadata_get(m, elem.key, NULL, AV_METADATA_MATCH_CASE);
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    if(!m)
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        m=*pm= av_mallocz(sizeof(*m));
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    if(tag){
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        av_free(tag->value);
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        av_free(tag->key);
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        *tag= m->elems[--m->count];
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    }else{
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        AVMetadataTag *tmp= av_realloc(m->elems, (m->count+1) * sizeof(*m->elems));
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        if(tmp){
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            m->elems= tmp;
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        }else
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            return AVERROR(ENOMEM);
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    }
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    if(elem.value){
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        elem.key  = av_strdup(elem.key  );
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        elem.value= av_strdup(elem.value);
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        m->elems[m->count++]= elem;
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    }
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    if(!m->count)
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        av_freep(pm);
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    return 0;
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}
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void av_metadata_free(AVMetadata **pm)
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{
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    AVMetadata *m= *pm;
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    if(m){
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        while(m->count--){
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            av_free(m->elems[m->count].key);
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            av_free(m->elems[m->count].value);
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        }
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        av_free(m->elems);
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    }
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    av_freep(pm);
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}