def __check_crc(self, cmd, result):
""" Calculate the CRC of the data for a certain master command.
:param cmd: instance of MasterCommandSpec.
:param result: A dict containing the result of the master command.
:returns: boolean
"""
crc = 0
for field in cmd.output_fields:
if Field.is_crc(field):
break
else:
for byte in field.encode(result[field.name]):
crc += ord(byte)
return result['crc'] == [67, (crc / 256), (crc % 256)]
def __check_crc(cmd, result, extended_crc=False):
""" Calculate the CRC of the data for a certain master command.
:param cmd: instance of MasterCommandSpec.
:param result: A dict containing the result of the master command.
:param extended_crc: Indicates whether the action should be included in the crc
:returns: boolean
"""
crc = 0
if extended_crc:
crc += ord(cmd.action[0])
crc += ord(cmd.action[1])
for field in cmd.output_fields:
if Field.is_crc(field):
break
else:
for byte in field.encode(result[field.name]):
crc += ord(byte)
return result['crc'] == [67, (crc / 256), (crc % 256)]
