def send(self, payload, roa=False, eot=True):
"""
Encapsulate the payload in a X.224 Data PDU and send it to the transport (previous) layer.
:type payload: bytes
:param eot: End of transmission.
:param roa: Request of acknowledgement
"""
pdu = X224DataPDU(roa, eot, payload)
self.previous.send(self.mainParser.write(pdu))
def sendBytes(self, data: bytes, roa: bool = False, eot: bool = True):
"""
Encapsulate the payload in a X.224 Data PDU and send it to the previous layer.
:param data: bytes to send.
:param eot: End of transmission.
:param roa: Request of acknowledgement
"""
pdu = X224DataPDU(roa, eot, data)
self.previous.sendBytes(self.mainParser.write(pdu))
def parseData(self, data, length):
"""
Parse a Data PDU from the raw bytes
:type data: bytes
:param length: The length in bytes of the Data PDU.
:return: X224DataPDU
"""
if length != 2:
raise ParsingError("Invalid X224 Data PDU length indicator: expected = 2, indicator = %d" % length)
code = Uint8.unpack(data[1]) & 0xf
sequence = Uint8.unpack(data[2])
payload = data[3 :]
return X224DataPDU(code & 1 == 1, sequence & 0x80 == 0x80, payload)