private var _buffer:ByteArray;

protected var urlStream:URLStream = new URLStream();

 

protected function urlStreamProgressHandler(event:ProgressEvent):void

{

   event.target.readBytes(_buffer,0,urlStream.bytesAvailable);

   _buffer.position = 0;

   if(_buffer.bytesAvailable > 0)

   {

      _stream.appendBytes(_buffer);

      _elapsed_bytes += _buffer.length;

      _buffer.clear();

   }

}