处理ID3 乱码问题

package org.study.code
{
import flash.utils.ByteArray;
public class EncodeUtf8
{
public function EncodeUtf8():void
{
}
public function parseEncodeUtf8(str:String):String
{
if (str != null)
{
var oriByteArr:ByteArray=new ByteArray();
oriByteArr.writeUTFBytes(str);
var needEncode:Boolean=false;
for (var i=0; i<oriByteArr.length; i+= 2)
{

      if (oriByteArr[i] == 195 || oriByteArr[i] == 194)
{
needEncode=true;
break;
}
if (oriByteArr[i] == 32)
{
i--;
}
}
if (needEncode)
{
var tempByteArr:ByteArray=new ByteArray;
for (i=0; i<oriByteArr.length; i++)
{
if (oriByteArr[i] == 194)
{
tempByteArr.writeByte(oriByteArr[i + 1]);
i++;
} else if (oriByteArr[i] == 195)
{
tempByteArr.writeByte(oriByteArr[i + 1] + 64);
i++;
} else
{
tempByteArr.writeByte(oriByteArr[i]);
}
}
tempByteArr.position=0;
return tempByteArr.readMultiByte(tempByteArr.bytesAvailable,"chinese");
} else
{
return str;
}
} else
{
return "";
}
}
}
}