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Speed up RtlTimeToTimeFields.

This commit is contained in:
Huw Davies 2004-02-24 01:01:27 +00:00 committed by Alexandre Julliard
parent 4fe98c5af0
commit 166faa455d
1 changed files with 19 additions and 11 deletions
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30
dlls/ntdll/time.c
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@ -272,6 +272,9 @@ static const struct tagTZ_INFO TZ_INFO[] =
#define DAYSPERNORMALYEAR 365
#define DAYSPERLEAPYEAR 366
#define MONSPERYEAR 12
#define DAYSPERQUADRICENTENNIUM (365 * 400 + 97)
#define DAYSPERNORMALCENTURY (365 * 100 + 24)
#define DAYSPERNORMALQUADRENNIUM (365 * 4 + 1)
/* 1601 to 1970 is 369 years plus 89 leap days */
#define SECS_1601_TO_1970 ((369 * 365 + 89) * (ULONGLONG)SECSPERDAY)
@ -350,7 +353,7 @@ VOID WINAPI RtlTimeToTimeFields(
PTIME_FIELDS TimeFields)
{
const int *Months;
int SecondsInDay, CurYear;
int SecondsInDay, DeltaYear;
int LeapYear, CurMonth;
long int Days;
LONGLONG Time = liTime->QuadPart;
@ -376,17 +379,22 @@ VOID WINAPI RtlTimeToTimeFields(
TimeFields->Weekday = (CSHORT) ((EPOCHWEEKDAY + Days) % DAYSPERWEEK);
/* compute year */
CurYear = EPOCHYEAR;
/* FIXME: handle calendar modifications */
while (1)
{ LeapYear = IsLeapYear(CurYear);
if (Days < (long) YearLengths[LeapYear])
{ break;
}
CurYear++;
Days = Days - (long) YearLengths[LeapYear];
}
TimeFields->Year = (CSHORT) CurYear;
TimeFields->Year = EPOCHYEAR;
DeltaYear = Days / DAYSPERQUADRICENTENNIUM;
TimeFields->Year += DeltaYear * 400;
Days -= DeltaYear * DAYSPERQUADRICENTENNIUM;
DeltaYear = Days / DAYSPERNORMALCENTURY;
TimeFields->Year += DeltaYear * 100;
Days -= DeltaYear * DAYSPERNORMALCENTURY;
DeltaYear = Days / DAYSPERNORMALQUADRENNIUM;
TimeFields->Year += DeltaYear * 4;
Days -= DeltaYear * DAYSPERNORMALQUADRENNIUM;
DeltaYear = Days / DAYSPERNORMALYEAR;
TimeFields->Year += DeltaYear;
Days -= DeltaYear * DAYSPERNORMALYEAR;
LeapYear = IsLeapYear(TimeFields->Year);
/* Compute month of year */
Months = MonthLengths[LeapYear];