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AK: Make to_packed_dos_date() use days_since_epoch_to_date()

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implicitfield authored and Nico Weber committed 2025-08-31 14:04:15 -04:00
1 parent 5cadef3c8a
commit 10d2a31d26
1 file changed
+3 -19
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AK/DOSPackedTime.cpp
+3 -19
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@@ -39,33 +39,17 @@ DOSPackedTime to_packed_dos_time(unsigned hour, unsigned minute, unsigned second
return time;
}
// FIXME: Improve these naive algorithms.
ErrorOr<DOSPackedDate> to_packed_dos_date(UnixDateTime const& unix_date_time)
{
auto truncated_seconds_since_epoch = unix_date_time.truncated_seconds_since_epoch();
if (truncated_seconds_since_epoch < first_dos_representable_unix_timestamp || truncated_seconds_since_epoch > static_cast<i64>(last_dos_representable_unix_timestamp))
return EINVAL;
auto years_since_epoch = 0;
auto leftover_seconds = truncated_seconds_since_epoch;
while (leftover_seconds >= days_in_year(years_since_epoch + 1970) * seconds_per_day) {
leftover_seconds -= days_in_year(years_since_epoch + 1970) * seconds_per_day;
++years_since_epoch;
}
u64 days_since_epoch = truncated_seconds_since_epoch / seconds_per_day;
auto month_of_year = 1;
for (; month_of_year <= 12; ++month_of_year) {
auto seconds_in_current_month = days_in_month(years_since_epoch + 1970, month_of_year) * seconds_per_day;
if (leftover_seconds < seconds_in_current_month)
break;
leftover_seconds -= seconds_in_current_month;
}
auto [year, month, day] = days_since_epoch_to_date(days_since_epoch);
VERIFY(month_of_year <= 12);
auto day = leftover_seconds / seconds_per_day + 1;
return to_packed_dos_date(years_since_epoch + 1970, month_of_year, day);
return to_packed_dos_date(year, month, day);
}
ErrorOr<DOSPackedTime> to_packed_dos_time(UnixDateTime const& unix_date_time)