port rest octets encoding code from osmo-bsc

As part of fixing issue OS#3075, we want to migrate support
for encoding system information from osmo-bsc to libosmocore.

This change ports osmo-bsc code for encoding SI rest octets.

The conversion was a bit tricky in some places because some
functions receive a 'struct gsm_bts' parameter in osmo-bsc.
In this libosmocore version, such functions expect parameters
which correspond to the individual fields of 'struct gsm_bts'
which are used by these functions.

Several structs from osmo-bsc's system_information.h are now
also declared in libosmocore headers, with an added osmo_ prefix
to avoid collisions with existing definitions in osmo-bsc.

Some helpers were ported from osmo-bsc's system_information.c
to libosmocore's gsm48_rest_octets.c. Contrary to osmo-bsc's
implementation they are now only visible within this file.

Unfortunately, this code ported from osmo-bsc lacks unit tests.

Change-Id: I47888965ab11bba1186c21987f1365c9270abeab
Related: OS#3075

1 files changed, 8 insertions, 0 deletions

diff --git a/src/gsm/libosmogsm.map b/src/gsm/libosmogsm.map
index 922ac01f..a9037870 100644
--- a/src/gsm/libosmogsm.map
+++ b/src/gsm/libosmogsm.map
@@ -273,6 +273,14 @@ gsm414_msgt_names;
 gsm48_push_l3hdr;
 gsm48_att_tlvdef;
 gsm48_cc_msg_name;
+gsm48_rest_octets_si1;
+gsm48_rest_octets_si2quater;
+gsm48_rest_octets_si2ter;
+gsm48_rest_octets_si2bis;
+gsm48_rest_octets_si6;
+gsm48_rest_octets_si3;
+gsm48_rest_octets_si4;
+gsm48_rest_octets_si13;
 gsm48_rr_msg_name;
 gsm48_cc_state_name;
 gsm48_construct_ra;