diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/gsm48.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/src/gsm48.c b/src/gsm48.c index 5761c67b..d024109b 100644 --- a/src/gsm48.c +++ b/src/gsm48.c @@ -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; +} |