media/libtheora/lib/dec/info.c

   1 /********************************************************************
   2  *                                                                  *
   3  * THIS FILE IS PART OF THE OggTheora SOFTWARE CODEC SOURCE CODE.   *
   4  * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
   5  * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
   6  * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
   7  *                                                                  *
   8  * THE Theora SOURCE CODE IS COPYRIGHT (C) 2002-2007                *
   9  * by the Xiph.Org Foundation http://www.xiph.org/                  *
  10  *                                                                  *
  11  ********************************************************************
  12
  13   function:
  14     last mod: $Id: info.c 13884 2007-09-22 08:38:10Z giles $
  15
  16  ********************************************************************/
  17
  18 #include <stdlib.h>
  19 #include <ctype.h>
  20 #include <string.h>
  21 #include "../internal.h"
  22
  23
  24
  25 /*This is more or less the same as strncasecmp, but that doesn't exist
  26    everywhere, and this is a fairly trivial function, so we include it.
  27   Note: We take advantage of the fact that we know _n is less than or equal to
  28    the length of at least one of the strings.*/
  29 static int oc_tagcompare(const char *_s1,const char *_s2,int _n){
  30   int c;
  31   for(c=0;c<_n;c++){
  32     if(toupper(_s1[c])!=toupper(_s2[c]))return !0;
  33   }
  34   return _s1[c]!='=';
  35 }
  36
  37
  38
  39 void th_info_init(th_info *_info){
  40   memset(_info,0,sizeof(*_info));
  41   _info->version_major=TH_VERSION_MAJOR;
  42   _info->version_minor=TH_VERSION_MINOR;
  43   _info->version_subminor=TH_VERSION_SUB;
  44   _info->keyframe_granule_shift=6;
  45 }
  46
  47 void th_info_clear(th_info *_info){
  48   memset(_info,0,sizeof(*_info));
  49 }
  50
  51
  52
  53 void th_comment_init(th_comment *_tc){
  54   memset(_tc,0,sizeof(*_tc));
  55 }
  56
  57 void th_comment_add(th_comment *_tc,char *_comment){
  58   int comment_len;
  59   _tc->user_comments=_ogg_realloc(_tc->user_comments,
  60    (_tc->comments+2)*sizeof(*_tc->user_comments));
  61   _tc->comment_lengths=_ogg_realloc(_tc->comment_lengths,
  62    (_tc->comments+2)*sizeof(*_tc->comment_lengths));
  63   comment_len=strlen(_comment);
  64   _tc->comment_lengths[_tc->comments]=comment_len;
  65   _tc->user_comments[_tc->comments]=_ogg_malloc(comment_len+1);
  66   memcpy(_tc->user_comments[_tc->comments],_comment,comment_len+1);
  67   _tc->comments++;
  68   _tc->user_comments[_tc->comments]=NULL;
  69 }
  70
  71 void th_comment_add_tag(th_comment *_tc,char *_tag,char *_val){
  72   char *comment;
  73   int   tag_len;
  74   int   val_len;
  75   tag_len=strlen(_tag);
  76   val_len=strlen(_val);
  77   /*+2 for '=' and '\0'.*/
  78   comment=_ogg_malloc(tag_len+val_len+2);
  79   memcpy(comment,_tag,tag_len);
  80   comment[tag_len]='=';
  81   memcpy(comment+tag_len+1,_val,val_len+1);
  82   th_comment_add(_tc,comment);
  83   _ogg_free(comment);
  84 }
  85
  86 char *th_comment_query(th_comment *_tc,char *_tag,int _count){
  87   long i;
  88   int  found;
  89   int  tag_len;
  90   tag_len=strlen(_tag);
  91   found=0;
  92   for(i=0;i<_tc->comments;i++){
  93     if(!oc_tagcompare(_tc->user_comments[i],_tag,tag_len)){
  94       /*We return a pointer to the data, not a copy.*/
  95       if(_count==found++)return _tc->user_comments[i]+tag_len+1;
  96     }
  97   }
  98   /*Didn't find anything.*/
  99   return NULL;
 100 }
 101
 102 int th_comment_query_count(th_comment *_tc,char *_tag){
 103   long i;
 104   int  tag_len;
 105   int  count;
 106   tag_len=strlen(_tag);
 107   count=0;
 108   for(i=0;i<_tc->comments;i++){
 109     if(!oc_tagcompare(_tc->user_comments[i],_tag,tag_len))count++;
 110   }
 111   return count;
 112 }
 113
 114 void th_comment_clear(th_comment *_tc){
 115   if(_tc!=NULL){
 116     long i;
 117     for(i=0;i<_tc->comments;i++)_ogg_free(_tc->user_comments[i]);
 118     _ogg_free(_tc->user_comments);
 119     _ogg_free(_tc->comment_lengths);
 120     _ogg_free(_tc->vendor);
 121     memset(_tc,0,sizeof(*_tc));
 122   }
 123 }