def code_to_num(assetno):
"""Convert an alphanumeric asset code to a uid/pid combo"""
assetno = str(assetno).upper()
if not luhn.is_valid(assetno, alphabet_lut):
raise Exception("""Asset code "%s" is not valid""" % assetno)
# Remove checkdigit
assetno = assetno[:-1]
field = [0, 0]
fieldno = 0
i = 0
for c in assetno:
if fieldno == 2:
raise Exception("""Error in asset code "%s", too many fields""" %
assetno)
num = alphabet_lut.index(c)
if num > 15:
field[fieldno] = field[fieldno] + (num - 16) * (16**i)
else:
field[fieldno] = field[fieldno] + num * (16**i)
fieldno += 1
i = -1
i += 1
return (field[0], field[1])
def code_to_num(assetno):
"""Convert an alphanumeric asset code to a uid/pid combo"""
assetno = str(assetno).upper()
if not luhn.is_valid(assetno, alphabet_lut):
raise Exception("""Asset code "%s" is not valid""" % assetno)
# Remove checkdigit
assetno = assetno[:-1]
field = [0, 0]
fieldno = 0
i = 0
for c in assetno:
if fieldno == 2:
raise Exception("""Error in asset code "%s", too many fields""" % assetno)
num = alphabet_lut.index(c)
if num > 15:
field[fieldno] = field[fieldno] + (num-16)*(16**i)
else:
field[fieldno] = field[fieldno] + num*(16**i)
fieldno += 1
i = -1
i += 1
return (field[0], field[1])
def num_to_code(uid, pid):
"""Convert a uid/pid number combo to an alphanumeric asset code"""
uid = int(uid)
pid = int(pid)
if uid < 0 or pid < 0:
raise ValueError("""User/Part ID cannot be negative. UID: %i, PID: %i""" % (uid, pid))
assetno = ""
for num in (uid, pid):
while 1:
if num > 15:
r = num % 16
assetno = assetno + alphabet_lut[r+16]
num = num/16
else:
assetno = assetno + alphabet_lut[num]
break
checkdigit = luhn.calc_check_digit(assetno, alphabet_lut)
assetno = assetno + checkdigit
assert(luhn.is_valid(assetno, alphabet_lut))
return assetno
def num_to_code(uid, pid):
"""Convert a uid/pid number combo to an alphanumeric asset code"""
uid = int(uid)
pid = int(pid)
if uid < 0 or pid < 0:
raise ValueError(
"""User/Part ID cannot be negative. UID: %i, PID: %i""" %
(uid, pid))
assetno = ""
for num in (uid, pid):
while 1:
if num > 15:
r = num % 16
assetno = assetno + alphabet_lut[r + 16]
num = num / 16
else:
assetno = assetno + alphabet_lut[num]
break
checkdigit = luhn.calc_check_digit(assetno, alphabet_lut)
assetno = assetno + checkdigit
assert (luhn.is_valid(assetno, alphabet_lut))
return assetno
def is_valid(self):
length_of_card = len(self.card_no)
print length_of_card
return (length_of_card == 14 or length_of_card == 16) and luhn.is_valid(self.card_no)
