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NFC: Saflok parser Date Rollover (#201)

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* Date Rollover

Update the saflok parser to properly handle date rollovers.

* Format

---------

Co-authored-by: Willy-JL <49810075+Willy-JL@users.noreply.github.com>
This commit is contained in:
Kara Zajac
2024-09-03 00:29:07 +00:00
committed by GitHub
parent 47f740d214
commit 67ffec5cc6
1 changed files with 26 additions and 0 deletions
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applications/main/nfc/plugins/supported_cards/saflok.c
+26
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@@ -360,6 +360,32 @@ bool saflok_parse(const NfcDevice* device, FuriString* parsed_data) {
uint8_t expire_hour = interval_hour;
uint8_t expire_minute = interval_minute;
// Handle month rollover
while(expire_month > 12) {
expire_month -= 12;
expire_year++;
}
// Handle day rollover
static const uint8_t days_in_month[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
while(true) {
uint8_t max_days = days_in_month[expire_month - 1];
// Adjust for leap years
if(expire_month == 2 &&
(expire_year % 4 == 0 && (expire_year % 100 != 0 || expire_year % 400 == 0))) {
max_days = 29;
}
if(expire_day <= max_days) {
break;
}
expire_day -= max_days;
expire_month++;
if(expire_month > 12) {
expire_month = 1;
expire_year++;
}
}
// Byte 16: Checksum
uint8_t checksum = decodedBA[16];
uint8_t checksum_calculated = CalculateCheckSum(decodedBA);