[PATCH] gsm48: factor out MCC+MNC BCD parsing for re-use in UMTS

This is merely a historical archive of years 2008-2021, before the migration to mailman3.

A maintained and still updated list archive can be found at https://lists.osmocom.org/hyperkitty/list/OpenBSC@lists.osmocom.org/.

Neels Hofmeyr nhofmeyr at sysmocom.de
Wed Mar 16 22:40:45 UTC 2016


On Wed, Mar 16, 2016 at 11:46:01AM +0100, Harald Welte wrote:
> Hi Neels,
> 
> On Tue, Mar 15, 2016 at 01:28:10PM +0100, Neels Hofmeyr wrote:
> > So create new functions to take on the MCC+MNC BCD handling and call those
> > from gsm48_generate_lai() and gsm48_decode_lai(). In this way, the 3G code
> > in openbsc can use only the BCD functionality without code duplication.
> 
> fine.  As this kind of bit/nibble shifting is something that can easily
> get wrong, and we don't have a test case yet, it should be best to add a
> test case testing gsm48_generate_lai() first, then perform the
> factoring-out and confirm that the test result doesn't change.

I agree on that. I didn't check hence wasn't aware that no test for
gsm48_generate_lai() exists. Nevertheless, when Holger and I went thru the
patch review, we broke the BCD generation/parsing code on purpose and
actually managed to provoke a test failure with that. So these functions
seem to be tested, at least indirectly. I hope that's sufficient...?

~Neels

-- 
- Neels Hofmeyr <nhofmeyr at sysmocom.de>          http://www.sysmocom.de/
=======================================================================
* sysmocom - systems for mobile communications GmbH
* Alt-Moabit 93
* 10559 Berlin, Germany
* Sitz / Registered office: Berlin, HRB 134158 B
* Geschäftsführer / Managing Directors: Holger Freyther, Harald Welte
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 819 bytes
Desc: Digital signature
URL: <http://lists.osmocom.org/pipermail/openbsc/attachments/20160316/e913244c/attachment.bin>


More information about the OpenBSC mailing list