pySim-prog: use functions to derive MCC/MNC from IMSI
In case the MCC/MNC are not supplied with a CSV file we cut out the
missing values from the IMSI string. Lets use a function to do this and
also check the input parameters.
Change-Id: I98e5bf8f9ff2a852efb190cc789edf42c5075bf8
diff --git a/pySim/utils.py b/pySim/utils.py
index a68af0a..e8dd531 100644
--- a/pySim/utils.py
+++ b/pySim/utils.py
@@ -206,3 +206,30 @@
num = map(int, str(cc))
check_digit = 10 - sum(num[-2::-2] + [sum(divmod(d * 2, 10)) for d in num[::-2]]) % 10
return 0 if check_digit == 10 else check_digit
+
+def mcc_from_imsi(imsi):
+ """
+ Derive the MCC (Mobile Country Code) from the first three digits of an IMSI
+ """
+ if imsi == None:
+ return None
+
+ if len(imsi) > 3:
+ return imsi[:3]
+ else:
+ return None
+
+def mnc_from_imsi(imsi, long=False):
+ """
+ Derive the MNC (Mobile Country Code) from the 4th to 6th digit of an IMSI
+ """
+ if imsi == None:
+ return None
+
+ if len(imsi) > 3:
+ if long:
+ return imsi[3:6]
+ else:
+ return imsi[3:5]
+ else:
+ return None