public void bytestream_to_headerobj(byte[] buffer, int offset)
 {
     optype       = RCS_OP.NO_OP + DEFSX.get_int(buffer, offset + 0);
     payload_size = DEFSX.get_int(buffer, offset + 4);
     driveid      = DEFSX.get_int(buffer, offset + 8);
     driveoffset  = DEFSX.get_long(buffer, offset + 12);
     datasize     = DEFSX.get_int(buffer, offset + 20);
     seq_num      = DEFSX.get_long(buffer, offset + 24);
 }