protected override void End()
{
binaryWriter.Seek(0, SeekOrigin.Begin);
buf.Position = 0;
UInt16 len = (UInt16)(buf.Length - buf.Position - 2);
binaryWriter.Write(len);
buf.Flush();
DEBUG.Info(BitConverter.ToString(buf.GetBuffer(), 0, (int)buf.Length));
// DEBUG.Info ("after end len=" + buf.Length + " p=" + buf.Position + " size=" + (len));
buf.Position = 0;
}