cellular-infrastructure
/
osmo-bsc
mirror of https://gerrit.osmocom.org/osmo-bsc
9
0
Fork 0
Code Issues Releases Wiki Activity

import gsm48_mi_to_string() from OpenBSC

This commit is contained in:
Harald Welte 2010-03-28 18:14:50 +08:00
parent a3b844cf45
commit 9bb553ee40
2 changed files with 47 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
include/osmocore/gsm48.h
View File

@ -14,4 +14,8 @@ void gsm48_generate_lai(struct gsm48_loc_area_id *lai48, uint16_t mcc,
int gsm48_generate_mid_from_tmsi(uint8_t *buf, uint32_t tmsi);
int gsm48_generate_mid_from_imsi(uint8_t *buf, const char *imsi);
/* Convert Mobile Identity (10.5.1.4) to string */
int gsm48_mi_to_string(char *string, const int str_len,
const u_int8_t *mi, const int mi_len);
#endif

43
src/gsm48.c
View File

@ -261,3 +261,46 @@ int gsm48_generate_mid_from_imsi(uint8_t *buf, const char *imsi)
return 2 + buf[1];
}
/* Convert Mobile Identity (10.5.1.4) to string */
int gsm48_mi_to_string(char *string, const int str_len, const u_int8_t *mi, const int mi_len)
{
int i;
u_int8_t mi_type;
char *str_cur = string;
u_int32_t tmsi;
mi_type = mi[0] & GSM_MI_TYPE_MASK;
switch (mi_type) {
case GSM_MI_TYPE_NONE:
break;
case GSM_MI_TYPE_TMSI:
/* Table 10.5.4.3, reverse generate_mid_from_tmsi */
if (mi_len == GSM48_TMSI_LEN && mi[0] == (0xf0 | GSM_MI_TYPE_TMSI)) {
memcpy(&tmsi, &mi[1], 4);
tmsi = ntohl(tmsi);
return snprintf(string, str_len, "%u", tmsi);
}
break;
case GSM_MI_TYPE_IMSI:
case GSM_MI_TYPE_IMEI:
case GSM_MI_TYPE_IMEISV:
*str_cur++ = bcd2char(mi[0] >> 4);
for (i = 1; i < mi_len; i++) {
if (str_cur + 2 >= string + str_len)
return str_cur - string;
*str_cur++ = bcd2char(mi[i] & 0xf);
/* skip last nibble in last input byte when GSM_EVEN */
if( (i != mi_len-1) || (mi[0] & GSM_MI_ODD))
*str_cur++ = bcd2char(mi[i] >> 4);
}
break;
default:
break;
}
*str_cur++ = '\0';
return str_cur - string;
}