def _unmask_crc(masked_crc):
 rot = ((masked_crc - _CRC_MASK_DELTA) & 4294967295L)
 return (((rot >> 17) | (rot << 15)) & 4294967295L)

def _unmask_crc ( masked_crc ) : rot = ( ( masked_crc - _CRC_MASK_DELTA ) & 4294967295 L ) return ( ( ( rot >> 17 ) | ( rot << 15 ) ) & 4294967295 L )
unmask crc .