def test_MSB_LSB(self):
data = NumberMask(random.randint(1, 0xFF), 8)
crcSize = 8
crcMax = 2**crcSize - 1
inputPoly = NumberMask(random.randint(1, crcMax), crcSize)
regInit = random.randint(0, crcMax)
xorOut = random.randint(0, crcMax)
crcProc = DivisionCRC()
crcProc.setRegisterInitValue(regInit)
crcProc.setXorOutValue(xorOut)
crc = crcProc.calculateMSB(data, inputPoly)
revData = data.reversed()
revPoly = inputPoly.reversed()
revRegInit = reverse_number(regInit, crcSize)
revXorOut = reverse_number(xorOut, crcSize)
revCrcProc = DivisionCRC()
revCrcProc.setReversed()
revCrcProc.setRegisterInitValue(revRegInit)
revCrcProc.setXorOutValue(revXorOut)
crc2 = revCrcProc.calculateLSB(revData, revPoly)
revCrc = reverse_number(crc2, crcSize)
# print "values: data:{} poly:{:X} init:{:X} xorOut:{:08b} crc:{:08b} revcrc:{:08b}".format( data, inputPoly, regInit, xorOut, crc, revCrc )
self.assertEqual(crc, revCrc)
def test_crcmod_c8d16_revB(self):
data = NumberMask(0xE3F2, 16)
inputPoly = NumberMask(0x1F0, 8)
regInit = 0x0
xorOut = 0x0
reverse = True
revInputPoly = inputPoly.reversed()
revData = data.reorderedBytes()
crc_func = crcmod.mkCrcFun(revInputPoly.masterData(),
rev=reverse,
initCrc=regInit,
xorOut=xorOut)
crcLib = crc_func(revData.toASCII())
# print "crc: {:X} {:X}".format( crc, crc2 )
crcProc = DivisionCRC()
crcProc.setReversed(reverse)
crcProc.setXorOutValue(xorOut)
crcProc.setRegisterInitValue(regInit)
# crcProc.setInitCRC( regInit )
crc = crcProc.calculate3(data, inputPoly)
# print "values: {} poly:{:X} init:{:X} xorOut:{:08b} rev:{} crc:{:08b} crcmod:{:08b} crcxor:{:08b}".format( data, inputPoly, regInit, xorOut, reverse, crc, crcLib, crc^crcLib )
self.assertEqual(crc, crcLib)
def test_crcmod_8rev_symm(self):
data = NumberMask(0xFF, 8)
inputPoly = NumberMask(0x181, 8) ## leave symmetric
regInit = 0x0
xorOut = 0x0
crc_func = crcmod.mkCrcFun(inputPoly.masterData(),
initCrc=regInit,
rev=True,
xorOut=xorOut)
crcLib = crc_func(data.toASCII())
crcProc = ModCRC()
crcProc.setReversed()
crcProc.setRegisterInitValue(regInit)
crcProc.setXorOutValue(xorOut)
revData = data.reorderedBytes()
revPoly = inputPoly.reversed()
crc = crcProc.calculate3(revData, revPoly)
# print "crcx: {:b} {:b}".format( crc, crcLib )
self.assertEqual(crc, crcLib)