131 lines
3.9 KiB
C
131 lines
3.9 KiB
C
/********************************************************************
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* *
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* THIS FILE IS PART OF THE OggTheora SOFTWARE CODEC SOURCE CODE. *
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* USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
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* GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
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* IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
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* *
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* THE Theora SOURCE CODE IS COPYRIGHT (C) 2002-2009 *
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* by the Xiph.Org Foundation and contributors http://www.xiph.org/ *
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* *
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********************************************************************
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function:
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last mod: $Id: info.c 16503 2009-08-22 18:14:02Z giles $
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********************************************************************/
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#include <stdlib.h>
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#include <ctype.h>
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#include <string.h>
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#include "internal.h"
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/*This is more or less the same as strncasecmp, but that doesn't exist
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everywhere, and this is a fairly trivial function, so we include it.
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Note: We take advantage of the fact that we know _n is less than or equal to
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the length of at least one of the strings.*/
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static int oc_tagcompare(const char *_s1,const char *_s2,int _n){
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int c;
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for(c=0;c<_n;c++){
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if(toupper(_s1[c])!=toupper(_s2[c]))return !0;
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}
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return _s1[c]!='=';
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}
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void th_info_init(th_info *_info){
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memset(_info,0,sizeof(*_info));
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_info->version_major=TH_VERSION_MAJOR;
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_info->version_minor=TH_VERSION_MINOR;
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_info->version_subminor=TH_VERSION_SUB;
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_info->keyframe_granule_shift=6;
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}
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void th_info_clear(th_info *_info){
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memset(_info,0,sizeof(*_info));
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}
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void th_comment_init(th_comment *_tc){
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memset(_tc,0,sizeof(*_tc));
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}
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void th_comment_add(th_comment *_tc,char *_comment){
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char **user_comments;
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int *comment_lengths;
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int comment_len;
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user_comments=_ogg_realloc(_tc->user_comments,
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(_tc->comments+2)*sizeof(*_tc->user_comments));
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if(user_comments==NULL)return;
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_tc->user_comments=user_comments;
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comment_lengths=_ogg_realloc(_tc->comment_lengths,
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(_tc->comments+2)*sizeof(*_tc->comment_lengths));
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if(comment_lengths==NULL)return;
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_tc->comment_lengths=comment_lengths;
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comment_len=strlen(_comment);
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comment_lengths[_tc->comments]=comment_len;
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user_comments[_tc->comments]=_ogg_malloc(comment_len+1);
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if(user_comments[_tc->comments]==NULL)return;
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memcpy(_tc->user_comments[_tc->comments],_comment,comment_len+1);
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_tc->comments++;
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_tc->user_comments[_tc->comments]=NULL;
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}
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void th_comment_add_tag(th_comment *_tc,char *_tag,char *_val){
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char *comment;
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int tag_len;
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int val_len;
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tag_len=strlen(_tag);
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val_len=strlen(_val);
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/*+2 for '=' and '\0'.*/
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comment=_ogg_malloc(tag_len+val_len+2);
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if(comment==NULL)return;
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memcpy(comment,_tag,tag_len);
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comment[tag_len]='=';
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memcpy(comment+tag_len+1,_val,val_len+1);
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th_comment_add(_tc,comment);
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_ogg_free(comment);
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}
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char *th_comment_query(th_comment *_tc,char *_tag,int _count){
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long i;
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int found;
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int tag_len;
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tag_len=strlen(_tag);
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found=0;
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for(i=0;i<_tc->comments;i++){
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if(!oc_tagcompare(_tc->user_comments[i],_tag,tag_len)){
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/*We return a pointer to the data, not a copy.*/
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if(_count==found++)return _tc->user_comments[i]+tag_len+1;
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}
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}
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/*Didn't find anything.*/
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return NULL;
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}
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int th_comment_query_count(th_comment *_tc,char *_tag){
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long i;
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int tag_len;
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int count;
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tag_len=strlen(_tag);
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count=0;
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for(i=0;i<_tc->comments;i++){
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if(!oc_tagcompare(_tc->user_comments[i],_tag,tag_len))count++;
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}
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return count;
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}
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void th_comment_clear(th_comment *_tc){
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if(_tc!=NULL){
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long i;
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for(i=0;i<_tc->comments;i++)_ogg_free(_tc->user_comments[i]);
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_ogg_free(_tc->user_comments);
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_ogg_free(_tc->comment_lengths);
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_ogg_free(_tc->vendor);
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memset(_tc,0,sizeof(*_tc));
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}
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}
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