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-rw-r--r--include/osmocom/gsm/gsm48.h2
-rw-r--r--src/gsm/gsm48.c14
2 files changed, 16 insertions, 0 deletions
diff --git a/include/osmocom/gsm/gsm48.h b/include/osmocom/gsm/gsm48.h
index 16a625aa..1e7498a9 100644
--- a/include/osmocom/gsm/gsm48.h
+++ b/include/osmocom/gsm/gsm48.h
@@ -20,6 +20,8 @@ const char *gsm48_cc_state_name(uint8_t state);
const char *gsm48_cc_msg_name(uint8_t msgtype);
const char *rr_cause_name(uint8_t cause);
+int gsm48_decode_lai(struct gsm48_loc_area_id *lai, uint16_t *mcc,
+ uint16_t *mnc, uint16_t *lac);
void gsm48_generate_lai(struct gsm48_loc_area_id *lai48, uint16_t mcc,
uint16_t mnc, uint16_t lac);
int gsm48_generate_mid_from_tmsi(uint8_t *buf, uint32_t tmsi);
diff --git a/src/gsm/gsm48.c b/src/gsm/gsm48.c
index 379ed65c..61e5d2cb 100644
--- a/src/gsm/gsm48.c
+++ b/src/gsm/gsm48.c
@@ -285,6 +285,20 @@ void gsm48_generate_lai(struct gsm48_loc_area_id *lai48, uint16_t mcc,
lai48->lac = htons(lac);
}
+int gsm48_decode_lai(struct gsm48_loc_area_id *lai, uint16_t *mcc,
+ uint16_t *mnc, uint16_t *lac)
+{
+ *mcc = ((lai->digits[0] & 0x0f) << 8)
+ | (lai->digits[0] & 0xf0)
+ | (lai->digits[1] & 0x0f);
+ *mnc = ((lai->digits[2] & 0x0f) << 8)
+ | (lai->digits[2] & 0xf0)
+ | ((lai->digits[1] & 0xf0) >> 4);
+ *lac = ntohs(lai->lac);
+
+ return 0;
+}
+
int gsm48_generate_mid_from_tmsi(uint8_t *buf, uint32_t tmsi)
{
uint32_t *tptr = (uint32_t *) &buf[3];