// function like DosDateTimeToFileTime
BOOLEAN
FsdDosDateTimeToSystemTime (PDEVICE_EXTENSION DeviceExt, USHORT DosDate, USHORT DosTime, PLARGE_INTEGER SystemTime)
{
PDOSTIME pdtime = (PDOSTIME) &DosTime;
PDOSDATE pddate = (PDOSDATE) &DosDate;
TIME_FIELDS TimeFields;
LARGE_INTEGER LocalTime;
if (SystemTime == NULL)
return FALSE;
TimeFields.Milliseconds = 0;
TimeFields.Second = pdtime->Second * 2;
TimeFields.Minute = pdtime->Minute;
TimeFields.Hour = pdtime->Hour;
TimeFields.Day = pddate->Day;
TimeFields.Month = pddate->Month;
TimeFields.Year = (CSHORT)(DeviceExt->BaseDateYear + pddate->Year);
RtlTimeFieldsToTime (&TimeFields, &LocalTime);
ExLocalTimeToSystemTime(&LocalTime, SystemTime);
return TRUE;
}
LARGE_INTEGER
FatFatDateToNtTime (
IN PIRP_CONTEXT IrpContext,
IN FAT_DATE FatDate
)
/*++
Routine Description:
This routine converts a Fat datev value to its corresponding Nt GMT
Time value.
Arguments:
FatDate - Supplies the Fat Date to convert from
Return Value:
LARGE_INTEGER - Receives the corresponding Nt Time value
--*/
{
TIME_FIELDS TimeFields;
LARGE_INTEGER Time;
//
// Pack the input time/date into a time field record
//
TimeFields.Year = (USHORT)(FatDate.Year + 1980);
TimeFields.Month = (USHORT)(FatDate.Month);
TimeFields.Day = (USHORT)(FatDate.Day);
TimeFields.Hour = (USHORT)0;
TimeFields.Minute = (USHORT)0;
TimeFields.Second = (USHORT)0;
TimeFields.Milliseconds = (USHORT)0;
//
// Convert the time field record to Nt LARGE_INTEGER, and set it to zero
// if we were given a bogus time.
//
if (!RtlTimeFieldsToTime( &TimeFields, &Time )) {
Time.LowPart = 0;
Time.HighPart = 0;
} else {
ExLocalTimeToSystemTime( &Time, &Time );
}
return Time;
UNREFERENCED_PARAMETER( IrpContext );
}
NTSTATUS
ExpSetTimeZoneInformation(PTIME_ZONE_INFORMATION TimeZoneInformation)
{
LARGE_INTEGER LocalTime, SystemTime, OldTime;
TIME_FIELDS TimeFields;
DPRINT("ExpSetTimeZoneInformation() called\n");
DPRINT("Old time zone bias: %d minutes\n", ExpTimeZoneInfo.Bias);
DPRINT("Old time zone standard bias: %d minutes\n",
ExpTimeZoneInfo.StandardBias);
DPRINT("New time zone bias: %d minutes\n", TimeZoneInformation->Bias);
DPRINT("New time zone standard bias: %d minutes\n",
TimeZoneInformation->StandardBias);
/* Get the local time */
HalQueryRealTimeClock(&TimeFields);
RtlTimeFieldsToTime(&TimeFields, &LocalTime);
/* FIXME: Calculate transition dates */
/* Calculate the bias and set the ID */
ExpTimeZoneBias.QuadPart = ((LONGLONG)(TimeZoneInformation->Bias +
TimeZoneInformation->StandardBias)) *
TICKSPERMINUTE;
ExpTimeZoneId = TIME_ZONE_ID_STANDARD;
/* Copy the timezone information */
RtlCopyMemory(&ExpTimeZoneInfo,
TimeZoneInformation,
sizeof(TIME_ZONE_INFORMATION));
/* Set the new time zone information */
SharedUserData->TimeZoneBias.High1Time = ExpTimeZoneBias.u.HighPart;
SharedUserData->TimeZoneBias.High2Time = ExpTimeZoneBias.u.HighPart;
SharedUserData->TimeZoneBias.LowPart = ExpTimeZoneBias.u.LowPart;
SharedUserData->TimeZoneId = ExpTimeZoneId;
DPRINT("New time zone bias: %I64d minutes\n",
ExpTimeZoneBias.QuadPart / TICKSPERMINUTE);
/* Calculate the new system time */
ExLocalTimeToSystemTime(&LocalTime, &SystemTime);
/* Set the new system time */
KeSetSystemTime(&SystemTime, &OldTime, FALSE, NULL);
/* Return success */
DPRINT("ExpSetTimeZoneInformation() done\n");
return STATUS_SUCCESS;
}
FORCEINLINE
VOID
FatDateTimeToSystemTime(OUT PLARGE_INTEGER SystemTime,
IN PFAT_DATETIME FatDateTime,
IN UCHAR TenMs OPTIONAL)
{
TIME_FIELDS TimeFields;
/* Setup time fields */
TimeFields.Year = FatDateTime->Date.Year + 1980;
TimeFields.Month = FatDateTime->Date.Month;
TimeFields.Day = FatDateTime->Date.Day;
TimeFields.Hour = FatDateTime->Time.Hour;
TimeFields.Minute = FatDateTime->Time.Minute;
TimeFields.Second = (FatDateTime->Time.DoubleSeconds << 1);
/* Adjust up to 10 milliseconds
* if the parameter was supplied
*/
if (ARGUMENT_PRESENT(TenMs))
{
TimeFields.Second += TenMs / 100;
TimeFields.Milliseconds = (TenMs % 100) * 10;
}
else
{
TimeFields.Milliseconds = 0;
}
/* Fix seconds value that might get beyoud the bound */
if (TimeFields.Second > 59) TimeFields.Second = 0;
/* Perform ceonversion to system time if possible */
if (RtlTimeFieldsToTime(&TimeFields, SystemTime))
{
/* Convert to system time */
ExLocalTimeToSystemTime(SystemTime, SystemTime);
}
else
{
/* Set to default time if conversion failed */
*SystemTime = FatGlobalData.DefaultFileTime;
}
}
BOOLEAN
FatNtTimeToFatTime (
IN PIRP_CONTEXT IrpContext,
IN PLARGE_INTEGER NtTime,
IN BOOLEAN Rounding,
OUT PFAT_TIME_STAMP FatTime,
OUT OPTIONAL PCHAR TenMsecs
)
/*++
Routine Description:
This routine converts an NtTime value to its corresponding Fat time value.
Arguments:
NtTime - Supplies the Nt GMT Time value to convert from
Rounding - Indicates whether the NT time should be rounded up to a FAT boundary.
This should only be done *once* in the lifetime of a timestamp (important
for tunneling, which will cause a timestamp to pass through at least twice).
If true, rounded up. If false, rounded down to 10ms boundary. This obeys
the rules for non-creation time and creation times (respectively).
FatTime - Receives the equivalent Fat time value
TenMsecs - Optionally receive the number of tens of milliseconds the NtTime, after
any rounding, is greater than the FatTime
Return Value:
BOOLEAN - TRUE if the Nt time value is within the range of Fat's
time range, and FALSE otherwise
--*/
{
TIME_FIELDS TimeFields;
//
// Convert the input to the a time field record.
//
if (Rounding) {
//
// Add almost two seconds to round up to the nearest double second.
//
NtTime->QuadPart = NtTime->QuadPart + AlmostTwoSeconds;
}
ExSystemTimeToLocalTime( NtTime, NtTime );
RtlTimeToTimeFields( NtTime, &TimeFields );
//
// Check the range of the date found in the time field record
//
if ((TimeFields.Year < 1980) || (TimeFields.Year > (1980 + 127))) {
ExLocalTimeToSystemTime( NtTime, NtTime );
return FALSE;
}
//
// The year will fit in Fat so simply copy over the information
//
FatTime->Time.DoubleSeconds = (USHORT)(TimeFields.Second / 2);
FatTime->Time.Minute = (USHORT)(TimeFields.Minute);
FatTime->Time.Hour = (USHORT)(TimeFields.Hour);
FatTime->Date.Year = (USHORT)(TimeFields.Year - 1980);
FatTime->Date.Month = (USHORT)(TimeFields.Month);
FatTime->Date.Day = (USHORT)(TimeFields.Day);
if (TenMsecs) {
if (!Rounding) {
//
// If the number of seconds was not divisible by two, then there
// is another second of time (1 sec, 3 sec, etc.) Note we round down
// the number of milleconds onto tens of milleseconds boundaries.
//
*TenMsecs = (TimeFields.Milliseconds / 10) +
((TimeFields.Second % 2) * 100);
} else {
//
// If we rounded up, we have in effect changed the NT time. Therefore,
// it does not differ from the FAT time.
//
*TenMsecs = 0;
}
}
if (Rounding) {
//
// Slice off non-FAT boundary time and convert back to 64bit form
//
TimeFields.Milliseconds = 0;
TimeFields.Second -= TimeFields.Second % 2;
} else {
//
// Round down to 10ms boundary
//
TimeFields.Milliseconds -= TimeFields.Milliseconds % 10;
}
//
// Convert back to NT time
//
(VOID) RtlTimeFieldsToTime(&TimeFields, NtTime);
ExLocalTimeToSystemTime( NtTime, NtTime );
UNREFERENCED_PARAMETER( IrpContext );
return TRUE;
}
LARGE_INTEGER
FatFatTimeToNtTime (
IN PIRP_CONTEXT IrpContext,
IN FAT_TIME_STAMP FatTime,
IN UCHAR TenMilliSeconds
)
/*++
Routine Description:
This routine converts a Fat time value pair to its corresponding Nt GMT
Time value.
Arguments:
FatTime - Supplies the Fat Time to convert from
TenMilliSeconds - A 10 Milisecond resolution
Return Value:
LARGE_INTEGER - Receives the corresponding Nt GMT Time value
--*/
{
TIME_FIELDS TimeFields;
LARGE_INTEGER Time;
//
// Pack the input time/date into a time field record
//
TimeFields.Year = (USHORT)(FatTime.Date.Year + 1980);
TimeFields.Month = (USHORT)(FatTime.Date.Month);
TimeFields.Day = (USHORT)(FatTime.Date.Day);
TimeFields.Hour = (USHORT)(FatTime.Time.Hour);
TimeFields.Minute = (USHORT)(FatTime.Time.Minute);
TimeFields.Second = (USHORT)(FatTime.Time.DoubleSeconds * 2);
if (TenMilliSeconds != 0) {
TimeFields.Second += (USHORT)(TenMilliSeconds / 100);
TimeFields.Milliseconds = (USHORT)((TenMilliSeconds % 100) * 10);
} else {
TimeFields.Milliseconds = (USHORT)0;
}
//
// If the second value is greater than 59 then we truncate it to 0.
// Note that this can't happen with a proper FAT timestamp.
//
if (TimeFields.Second > 59) {
TimeFields.Second = 0;
}
//
// Convert the time field record to Nt LARGE_INTEGER, and set it to zero
// if we were given a bogus time.
//
if (!RtlTimeFieldsToTime( &TimeFields, &Time )) {
Time.LowPart = 0;
Time.HighPart = 0;
} else {
ExLocalTimeToSystemTime( &Time, &Time );
}
return Time;
UNREFERENCED_PARAMETER( IrpContext );
}
