diff options
Diffstat (limited to 'src/shared/libosmocore/src/gsm/gsm48.c')
| -rw-r--r-- | src/shared/libosmocore/src/gsm/gsm48.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/src/shared/libosmocore/src/gsm/gsm48.c b/src/shared/libosmocore/src/gsm/gsm48.c index 379ed65c..fe62dee7 100644 --- a/src/shared/libosmocore/src/gsm/gsm48.c +++ b/src/shared/libosmocore/src/gsm/gsm48.c @@ -285,6 +285,27 @@ void gsm48_generate_lai(struct gsm48_loc_area_id *lai48, uint16_t mcc, lai48->lac = htons(lac); } +/* Attention: this function retunrs true integers, not hex! */ +int gsm48_decode_lai(struct gsm48_loc_area_id *lai, uint16_t *mcc, + uint16_t *mnc, uint16_t *lac) +{ + *mcc = (lai->digits[0] & 0x0f) * 100 + + (lai->digits[0] >> 4) * 10 + + (lai->digits[1] & 0x0f); + + if ((lai->digits[1] & 0xf0) == 0xf0) { + *mnc = (lai->digits[2] & 0x0f) * 10 + + (lai->digits[2] >> 4); + } else { + *mnc = (lai->digits[2] & 0x0f) * 100 + + (lai->digits[2] >> 4) * 10 + + (lai->digits[1] >> 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]; |