gsm_04_08: add parser for Mobile Station Classmark 3
3GPP TS 24.008 section 10.5.1.7 describes a Mobile Station Classmark 3
IE, which is encoded as CSN.1 struct. This means that it can not be
parsed by just casting a memory location to a struct pointer, so lets
add a parser to parse the CM3 IE.
This is fixed version of Ic8b2bfd00330235f5bed00771e421588abfaac1f,
which got reverted because it used the keyword "class" as struct member,
which lead into problems with c++ builds. This is now fixed.
Change-Id: Id8732551b33616227609cd6fcf6c3133751a89eb
Related: OS#4796 SYS#5114
diff --git a/include/osmocom/gsm/gsm48_ie.h b/include/osmocom/gsm/gsm48_ie.h
index 339aa13..b79cbfc 100644
--- a/include/osmocom/gsm/gsm48_ie.h
+++ b/include/osmocom/gsm/gsm48_ie.h
@@ -119,3 +119,7 @@
/* decode "Cell Channel Description" (10.5.2.1b) and other frequency lists */
int gsm48_decode_freq_list(struct gsm_sysinfo_freq *f, uint8_t *cd,
uint8_t len, uint8_t mask, uint8_t frqt);
+
+/* decode "CSN.1 encoded Classmark 3" (10.5.1.7) */
+int gsm48_decode_classmark3(struct gsm48_classmark3 *classmark3_out,
+ const uint8_t *classmark3, size_t classmark3_len);