def setPayloadId(self, id):
'''Set payload id'''
if isinstance(id, list):
id = protocols.from8bit(id)
self._payload_id = id
def setPayloadLengthParsed(self, length):
'''Save parsed payload length'''
if isinstance(length, list):
length = protocols.from8bit(length)
self._payload_parsed_length = length
def processIncomingPacket(self, packet):
'''Takes a raw packet, checks it and returns the correct packet class'''
# Quick checks to make sure this is a legitimate packet
if not isinstance(packet, list):
raise TypeError, 'Expected a list'
if packet[0] != START_BYTE or packet[-1] != END_BYTE:
raise Exception, 'Start and/or end byte missing'
packet = self._unEscape(packet)
contents = {}
contents['flags'] = None
contents['payload_id'] = None
contents['payload'] = []
contents['checksum'] = None
index = 1
# Grab flags
contents['flags'] = flags = packet[index]
index += 1
# Grab payload id
contents['payload_id'] = protocols.from8bit(packet[index:index+2])
index += 2
# Grab payload
contents['payload'] = payload = packet[index:(len(packet) - 2)]
index += len(payload)
# Grab checksum
contents['checksum'] = checksum = packet[index]
index += 1
# Check checksum
gen_checksum = getChecksum(packet[1:index-1])
if checksum != gen_checksum:
raise Exception, 'Checksum is incorrect! Provided: %d, generated: %d' % (checksum, gen_checksum)
# Just double check we only have one byte left
if index != (len(packet) - 1):
raise Exception, 'Packet incorrectly processed, %d bytes left' % (len(packet) - 1 - index)
# Create response packet object
if contents['flags'] & HEADER_IS_PROTO:
packet_types = self._response_protocol_packets
else:
packet_types = self._response_firmware_packets
try:
type = packet_types[contents['payload_id']]
except KeyError:
type = 'responseGeneric'
if not hasattr(self, type):
type = 'responseGeneric'
response = getattr(self, type)()
# Populate data
response.parseHeaderFlags(contents['flags'])
response.setPayloadId(contents['payload_id'])
response.parsePayload(contents['payload'])
response.validate()
return response
