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pySim-prog: fix handling of mnclen parameter.

The handling of the mnclen parameter does not work. Lets fix it so that
it can be used again with CSV and normal card programming. Lets ensure
that depending on the parameter and the defaults it is always ensured
that the mnc string has the correct length so that lower layers can
deduct the length of the mnc properly by the string length of the mnc.

Change-Id: I48a109296efcd7a3f37c183ff53c5fc9544e3cfc
Related: OS#5830
---
M pySim-prog.py
1 file changed, 30 insertions(+), 5 deletions(-)

diff --git a/pySim-prog.py b/pySim-prog.py
index 2981ada..1ea1425 100755
--- a/pySim-prog.py
+++ b/pySim-prog.py
@@ -114,8 +114,8 @@
                       )
     parser.add_option("--mnclen", dest="mnclen", type="choice",
                       help="Length of Mobile Network Code [default: %default]",
-                      default=2,
-                      choices=[2, 3],
+                      default="auto",
+                      choices=["2", "3", "auto"],
                       )
     parser.add_option("-m", "--smsc", dest="smsc",
                       help="SMSC number (Start with + for international no.) [default: '00 + country code + 5555']",
@@ -319,8 +319,15 @@
 
     # MCC always has 3 digits
     mcc = lpad(mcc, 3, "0")
-    # MNC must be at least 2 digits
-    mnc = lpad(mnc, 2, "0")
+
+    # The MNC must be at least 2 digits long. This is also the most common case.
+    # The user may specify an explicit length using the --mnclen option.
+    if opts.mnclen != "auto":
+        if len(mnc) > int(opts.mnclen):
+            raise ValueError('mcc is longer than specified in option --mnclen')
+        mnc = lpad(mnc, int(opts.mnclen), "0")
+    else:
+        mnc = lpad(mnc, 2, "0")
 
     # Digitize country code (2 or 3 digits)
     cc_digits = _cc_digits(opts.country)
@@ -580,7 +587,25 @@
     row = find_row_in_csv_file(opts.read_csv, opts.num, iccid=iccid, imsi=imsi)
     if row is not None:
         row['mcc'] = row.get('mcc', mcc_from_imsi(row.get('imsi')))
-        row['mnc'] = row.get('mnc', mnc_from_imsi(row.get('imsi')))
+
+        # We cannot determine the MNC length (2 or 3 digits?) from the IMSI
+        # alone. In cases where the user has specified an mnclen via the
+        # commandline options we can use that info, otherwise we guess that
+        # the length is 2, which is also the most common case.
+        if opts.mnclen != "auto":
+            if opts.mnclen is "2":
+                row['mnc'] = row.get('mnc', mnc_from_imsi(row.get('imsi'), False))
+            elif opts.mnclen is "3":
+                row['mnc'] = row.get('mnc', mnc_from_imsi(row.get('imsi'), True))
+            else:
+                raise ValueError("invalid parameter --mnclen, must be 2 or 3 or auto")
+        else:
+            row['mnc'] = row.get('mnc', mnc_from_imsi(row.get('imsi'), False))
+
+	# NOTE: We might concider to specify a new CSV field "mnclen" in our
+	# CSV files for a better automatization. However, this only makes sense
+	# when the tools and databases we export our files from will also add
+	# such a field.
 
         pin_adm = None
         # We need to escape the pin_adm we get from the csv

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