Merge commit '816e24cb4296d6b7110da4a89661bbac8dc7af21' into libosmocore

[osmocom-bb.git] / src / shared / libosmocore / src / gsm_utils.c

diff --git a/src/shared/libosmocore/src/gsm_utils.c b/src/shared/libosmocore/src/gsm_utils.c
index 593dd5c..913946e 100644 (file)
--- a/src/shared/libosmocore/src/gsm_utils.c
+++ b/src/shared/libosmocore/src/gsm_utils.c
@@ -359,3 +359,35 @@ uint32_t gsm_gsmtime2fn(struct gsm_time *time)
        /* TS 05.02 Chapter 4.3.3 TDMA frame number */
        return (51 * ((time->t3 - time->t2 + 26) % 26) + time->t3 + (26 * 51 * time->t1));
 }
+
+/* TS 03.03 Chapter 2.6 */
+int gprs_tlli_type(uint32_t tlli)
+{
+       if ((tlli & 0xc0000000) == 0xc0000000)
+               return TLLI_LOCAL;
+       else if ((tlli & 0xc0000000) == 0x80000000)
+               return TLLI_FOREIGN;
+       else if ((tlli & 0xf8000000) == 0x78000000)
+               return TLLI_RANDOM;
+       else if ((tlli & 0xf8000000) == 0x70000000)
+               return TLLI_AUXILIARY;
+
+       return TLLI_RESERVED;
+}
+
+uint32_t gprs_tmsi2tlli(uint32_t p_tmsi, enum gprs_tlli_type type)
+{
+       uint32_t tlli;
+       switch (type) {
+       case TLLI_LOCAL:
+               tlli = p_tmsi | 0xc0000000;
+               break;
+       case TLLI_FOREIGN:
+               tlli = (p_tmsi & 0x3fffffff) | 0x80000000;
+               break;
+       default:
+               tlli = 0;
+               break;
+       }
+       return tlli;
+}