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DECT-NWK: Fix IPEI string formatting

master
Bernhard Dick 2022-11-23 20:30:42 +01:00 committed by Alexis La Goutte
parent 1272bd3c2d
commit cc86a34c90
1 changed files with 5 additions and 4 deletions
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9
epan/dissectors/packet-dect-nwk.c
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@ -2746,7 +2746,7 @@ where:
* PPPPPPP is the decimal representation of the last 20 bits
* C is calculated based on the digits by multiplying the digit with its position
(starting with 1 on the leftmost one), and taking the sum of those multiply results
module 11. If the result is 10 a '*' is displayed insted.
modulo 11. If the result is 10 a '*' is displayed instead.
*/
static void fmt_dect_nwk_ipei(gchar *ipei_string, guint64 ipei) {
guint16 emc, check_digit;
@ -2757,18 +2757,19 @@ static void fmt_dect_nwk_ipei(gchar *ipei_string, guint64 ipei) {
psn = ipei & 0xFFFFF;
digit_divisor = 100000000000;
ipei_digits = emc * 100000000 + psn;
ipei_digits = emc * 10000000 + psn;
check_digit = 0;
for(int i = 1; i <= 12; i++) {
check_digit += ( ipei_digits / digit_divisor ) * i;
ipei_digits = ipei_digits % digit_divisor;
digit_divisor /= 10;
}
check_digit = check_digit % 11;
if ( check_digit == 10) {
snprintf(ipei_string, 15, "%05d %07d *", emc, psn);
snprintf(ipei_string, 16, "%05d %07d *", emc, psn);
} else {
snprintf(ipei_string, 15, "%05d %07d %d", emc, psn, check_digit);
snprintf(ipei_string, 16, "%05d %07d %d", emc, psn, check_digit);
}
}