def test_create_header(self):
# tests the .rep property to ensure that
# a new XIPacketHeader can be created by
# the string rep of an existing header.
header1 = xi.XIPacketHeader(type=xi.PACKET_TYPE.ACK, payloadLength=0)
header2 = xi.XIPacketHeader.createXIPacketHeader(header1.rep)
self.assertEqual(header1.rep, header2.rep)
header1 = xi.XIPacketHeader(type=xi.PACKET_TYPE.DATA,
payloadLength=xi.XIPacket.maxPayload())
header2 = xi.XIPacketHeader.createXIPacketHeader(header1.rep)
self.assertEqual(header1.rep, header2.rep)
header1 = xi.XIPacketHeader(type=xi.PACKET_TYPE.CONNECTION,
payloadLength=2**2)
header2 = xi.XIPacketHeader.createXIPacketHeader(header1.rep)
self.assertEqual(header1.rep, header2.rep)
def test_non_default_values(self):
srcBits = xi.XIPacketHeader()._src_bit_length
dstBits = xi.XIPacketHeader()._dst_bit_length
seqNumBits = xi.XIPacketHeader()._seq_num_bit_length
# test all possible type, src, dst, seq num combinations
for _type in [
xi.PACKET_TYPE.ACK, xi.PACKET_TYPE.CONNECTION,
xi.PACKET_TYPE.DATA
]:
for src in range(2**srcBits):
for dst in range(2**dstBits):
for seqNum in range(2**seqNumBits):
header1 = xi.XIPacketHeader(type=_type,
payloadLength=0,
seqNum=seqNum,
src=src,
dst=dst)
header2 = xi.XIPacketHeader.createXIPacketHeader(
header1.rep)
self.assertEqual(header1.rep, header2.rep)
def test_crc_default(self):
header1 = xi.XIPacketHeader()
header2 = xi.XIPacketHeader()
self.assertEqual(header1.crc, header2.crc)
header1 = xi.XIPacketHeader(type=xi.PACKET_TYPE.CONNECTION)
header2 = xi.XIPacketHeader(type=xi.PACKET_TYPE.CONNECTION)
self.assertEqual(header1.crc, header2.crc)
header1 = xi.XIPacketHeader(type=xi.PACKET_TYPE.ACK)
header2 = xi.XIPacketHeader(type=xi.PACKET_TYPE.ACK)
self.assertEqual(header1.crc, header2.crc)
header1 = xi.XIPacketHeader(type=xi.PACKET_TYPE.DATA)
header2 = xi.XIPacketHeader(type=xi.PACKET_TYPE.DATA)
self.assertEqual(header1.crc, header2.crc)
def test_non_default_values(self):
seqNumBits = xi.XIPacketHeader()._seq_num_bit_length
# test all possible type, src, dst, seq num combinations
for _type in [
xi.PACKET_TYPE.ACK, xi.PACKET_TYPE.CONNECTION,
xi.PACKET_TYPE.DATA
]:
for seqNum in range(2**seqNumBits):
payloadLength = xi.XIPacket.maxPayload()
packet1 = xi.XIPacket(type=_type,
seqNum=seqNum,
buffer="".join([
chr(x % 0xFF)
for x in range(payloadLength)
]))
packet2 = xi.XIPacket.createXIPacket(packet1.rep)
self.assertEqual(packet1.rep, packet2.rep)
def test_crc_different_headers(self):
header1 = xi.XIPacketHeader(type=xi.PACKET_TYPE.ACK, payloadLength=0)
header2 = xi.XIPacketHeader(type=xi.PACKET_TYPE.CONNECTION,
payloadLength=0)
header3 = xi.XIPacketHeader(type=xi.PACKET_TYPE.DATA, payloadLength=0)
self.assertNotEqual(header1.crc, header2.crc)
self.assertNotEqual(header1.crc, header3.crc)
self.assertNotEqual(header2.crc, header3.crc)
header1 = xi.XIPacketHeader(type=xi.PACKET_TYPE.CONNECTION,
payloadLength=300)
header2 = xi.XIPacketHeader(type=xi.PACKET_TYPE.CONNECTION,
payloadLength=3)
header3 = xi.XIPacketHeader(type=xi.PACKET_TYPE.CONNECTION,
payloadLength=2)
self.assertNotEqual(header1.crc, header2.crc)
self.assertNotEqual(header1.crc, header3.crc)
self.assertNotEqual(header2.crc, header3.crc)
def test_init(self):
self.assertNotEqual(xi.XIPacketHeader(), None)