class CRCCCITTTest(unittest.TestCase):
def setUp(self):
self.crc_1 = CRCCCITT(version='XModem')
self.crc_2 = CRCCCITT(version='FFFF')
self.crc_3 = CRCCCITT(version='1D0F')
def testNoVersionInit(self):
msg = ("Providing no version at initialization should result "
"in an Exception")
self.assertRaises(Exception, CRCCCITT(version=None), msg)
def testWrongVersionInit(self):
msg = ("Providing wrong version at initialization should result "
"in an Exception")
self.assertRaises(Exception, CRCCCITT(version='WrongVersion'), msg)
def testNoneArgCalculate(self):
msg = ("Providing calculate method with argument set to None should "
"result in an Exception")
self.assertRaises(Exception, self.crc_1.calculate(None), msg)
def testNoArgCalculate(self):
msg = ("Providing calculate method with no argument should return "
"result in an Exception")
self.assertRaises(Exception, self.crc_1.calculate(), msg)
def testCalculateVersion3(self):
msg = "Calculated CRC CCITT (0x1D0F) for 0123456789 should be 0x18A1"
self.assertEqual(
self.crc_3.calculate("0123456789"), int('0x18A1', 0), msg)
def testCalculateVersion2(self):
msg = "Calculated CRC CCITT (0xFFFF) for 0123456789 should be 0x7D61"
self.assertEqual(
self.crc_2.calculate("0123456789"), int('0x7D61', 0), msg)
def testCalculateVersion1(self):
msg = "Calculated CRC CCITT (XModem) for 0123456789 should be 0x9C58"
self.assertEqual(
self.crc_1.calculate("0123456789"), int('0x9C58', 0), msg)
def testTableItem42(self):
msg = "The precalculated table's item #42 should be 0x8528"
self.assertEqual(self.crc_1.crc_ccitt_tab[42], '0x8528', msg)
def testTableItem10(self):
msg = "The precalculated table's item #10 should be 0xa14a"
self.assertEqual(self.crc_1.crc_ccitt_tab[10], '0xa14a', msg)
def testTableItems(self):
msg = ("After creating a CRC CCITT object we must have a "
"precalculated table with 256 items")
self.assertEqual(len(self.crc_1.crc_ccitt_tab), 256, msg)
def testTableNotEmpty(self):
msg = ("After creating a CRC CCITT object we must have a "
"precalculated table not empty")
self.assertIsNot(self.crc_1.crc_ccitt_tab, [], msg)
class CRCCCITTTest(unittest.TestCase):
def setUp(self):
self.crc_1 = CRCCCITT(version='XModem')
self.crc_2 = CRCCCITT(version='FFFF')
self.crc_3 = CRCCCITT(version='1D0F')
def testNoVersionInit(self):
msg = ("Providing no version at initialization should result "
"in an Exception")
self.assertRaises(Exception, CRCCCITT(version=None), msg)
def testWrongVersionInit(self):
msg = ("Providing wrong version at initialization should result "
"in an Exception")
self.assertRaises(Exception, CRCCCITT(version='WrongVersion'), msg)
def testNoneArgCalculate(self):
msg = ("Providing calculate method with argument set to None should "
"result in an Exception")
self.assertRaises(Exception, self.crc_1.calculate(None), msg)
def testNoArgCalculate(self):
msg = ("Providing calculate method with no argument should return "
"result in an Exception")
self.assertRaises(Exception, self.crc_1.calculate(), msg)
def testCalculateVersion3(self):
msg = "Calculated CRC CCITT (0x1D0F) for 0123456789 should be 0x18A1"
self.assertEqual(self.crc_3.calculate("0123456789"), int('0x18A1', 0),
msg)
def testCalculateVersion2(self):
msg = "Calculated CRC CCITT (0xFFFF) for 0123456789 should be 0x7D61"
self.assertEqual(self.crc_2.calculate("0123456789"), int('0x7D61', 0),
msg)
def testCalculateVersion1(self):
msg = "Calculated CRC CCITT (XModem) for 0123456789 should be 0x9C58"
self.assertEqual(self.crc_1.calculate("0123456789"), int('0x9C58', 0),
msg)
def testTableItem42(self):
msg = "The precalculated table's item #42 should be 0x8528"
self.assertEqual(self.crc_1.crc_ccitt_tab[42], '0x8528', msg)
def testTableItem10(self):
msg = "The precalculated table's item #10 should be 0xa14a"
self.assertEqual(self.crc_1.crc_ccitt_tab[10], '0xa14a', msg)
def testTableItems(self):
msg = ("After creating a CRC CCITT object we must have a "
"precalculated table with 256 items")
self.assertEqual(len(self.crc_1.crc_ccitt_tab), 256, msg)
def testTableNotEmpty(self):
msg = ("After creating a CRC CCITT object we must have a "
"precalculated table not empty")
self.assertIsNot(self.crc_1.crc_ccitt_tab, [], msg)
class PromptPayQR:
fields = {
}
def __init__(self):
self.crc_obj = CRCCCITT('FFFF')
self.addField('version', '01', '00')
self.addField('onetime', '12', '01')
self.addField('currency', '764', '53')
self.addField('country', 'TH', '58')
def setAmount(self, amount):
self.addField('amount', '%.2f' % round(amount, 2), '54')
def addField(self, name, value, code):
self.fields[code] = PromptPayField(code, name, value)
def __str__(self):
return self.toString()
def toString(self):
outStr = ''
for code, field in sorted(self.fields.items()):
outStr += str(field)
crc = self.crc_obj.calculate(outStr+'6304')
crchex = hex(crc)[2:].upper()
crcField = PromptPayField('63', 'crc16', crchex)
outStr += str(crcField)
return outStr
def genCrc(self):
"""Generate CRC-CCITT"""
crcCalc = CRCCCITT('FFFF')
frameInBytes = bytes.fromhex(self.fullFrameHexStr)
theCrc = hex(crcCalc.calculate(frameInBytes))[2:].zfill(4)
self.crc = theCrc.upper()
def genChk(self, crcInputData):
"""Generate CRC-CCITT based on command frame"""
crcCalc = CRCCCITT('FFFF')
frameInBytes = bytes.fromhex(crcInputData)
theCrc = hex(crcCalc.calculate(frameInBytes))[2:].zfill(4)
self.chk = theCrc.upper()
def checksum(self, byte_string): return CRCCCITT.calculate(byte_string)