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aeadcaf515
Modified it so that it builds in trunk (with GCC, though). Not to be switched for now, as it doesn't work in ReactOS (yet?).
365 lines
7.9 KiB
C
365 lines
7.9 KiB
C
/*++
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Copyright (c) 1989-2000 Microsoft Corporation
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Module Name:
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TimeSup.c
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Abstract:
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This module implements the Fat Time conversion support routines
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--*/
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#include "fatprocs.h"
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text(PAGE, FatNtTimeToFatTime)
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#pragma alloc_text(PAGE, FatFatDateToNtTime)
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#pragma alloc_text(PAGE, FatFatTimeToNtTime)
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#pragma alloc_text(PAGE, FatGetCurrentFatTime)
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#endif
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BOOLEAN
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FatNtTimeToFatTime (
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IN PIRP_CONTEXT IrpContext,
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IN PLARGE_INTEGER NtTime,
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IN BOOLEAN Rounding,
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OUT PFAT_TIME_STAMP FatTime,
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#ifndef __REACTOS__
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OUT OPTIONAL PCHAR TenMsecs
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#else
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OUT OPTIONAL PUCHAR TenMsecs
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#endif
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)
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/*++
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Routine Description:
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This routine converts an NtTime value to its corresponding Fat time value.
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Arguments:
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NtTime - Supplies the Nt GMT Time value to convert from
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Rounding - Indicates whether the NT time should be rounded up to a FAT boundary.
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This should only be done *once* in the lifetime of a timestamp (important
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for tunneling, which will cause a timestamp to pass through at least twice).
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If true, rounded up. If false, rounded down to 10ms boundary. This obeys
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the rules for non-creation time and creation times (respectively).
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FatTime - Receives the equivalent Fat time value
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TenMsecs - Optionally receive the number of tens of milliseconds the NtTime, after
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any rounding, is greater than the FatTime
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Return Value:
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BOOLEAN - TRUE if the Nt time value is within the range of Fat's
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time range, and FALSE otherwise
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--*/
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{
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TIME_FIELDS TimeFields;
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//
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// Convert the input to the a time field record.
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//
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if (Rounding) {
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//
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// Add almost two seconds to round up to the nearest double second.
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//
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NtTime->QuadPart = NtTime->QuadPart + AlmostTwoSeconds;
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}
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ExSystemTimeToLocalTime( NtTime, NtTime );
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RtlTimeToTimeFields( NtTime, &TimeFields );
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//
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// Check the range of the date found in the time field record
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//
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if ((TimeFields.Year < 1980) || (TimeFields.Year > (1980 + 127))) {
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ExLocalTimeToSystemTime( NtTime, NtTime );
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return FALSE;
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}
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//
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// The year will fit in Fat so simply copy over the information
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//
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FatTime->Time.DoubleSeconds = (USHORT)(TimeFields.Second / 2);
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FatTime->Time.Minute = (USHORT)(TimeFields.Minute);
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FatTime->Time.Hour = (USHORT)(TimeFields.Hour);
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FatTime->Date.Year = (USHORT)(TimeFields.Year - 1980);
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FatTime->Date.Month = (USHORT)(TimeFields.Month);
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FatTime->Date.Day = (USHORT)(TimeFields.Day);
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if (TenMsecs) {
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if (!Rounding) {
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//
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// If the number of seconds was not divisible by two, then there
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// is another second of time (1 sec, 3 sec, etc.) Note we round down
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// the number of milleconds onto tens of milleseconds boundaries.
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//
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*TenMsecs = (TimeFields.Milliseconds / 10) +
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((TimeFields.Second % 2) * 100);
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} else {
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//
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// If we rounded up, we have in effect changed the NT time. Therefore,
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// it does not differ from the FAT time.
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//
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*TenMsecs = 0;
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}
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}
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if (Rounding) {
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//
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// Slice off non-FAT boundary time and convert back to 64bit form
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//
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TimeFields.Milliseconds = 0;
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TimeFields.Second -= TimeFields.Second % 2;
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} else {
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//
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// Round down to 10ms boundary
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//
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TimeFields.Milliseconds -= TimeFields.Milliseconds % 10;
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}
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//
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// Convert back to NT time
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//
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(VOID) RtlTimeFieldsToTime(&TimeFields, NtTime);
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ExLocalTimeToSystemTime( NtTime, NtTime );
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UNREFERENCED_PARAMETER( IrpContext );
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return TRUE;
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}
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LARGE_INTEGER
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FatFatDateToNtTime (
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IN PIRP_CONTEXT IrpContext,
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IN FAT_DATE FatDate
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)
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/*++
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Routine Description:
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This routine converts a Fat datev value to its corresponding Nt GMT
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Time value.
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Arguments:
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FatDate - Supplies the Fat Date to convert from
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Return Value:
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LARGE_INTEGER - Receives the corresponding Nt Time value
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--*/
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{
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TIME_FIELDS TimeFields;
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LARGE_INTEGER Time;
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//
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// Pack the input time/date into a time field record
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//
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TimeFields.Year = (USHORT)(FatDate.Year + 1980);
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TimeFields.Month = (USHORT)(FatDate.Month);
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TimeFields.Day = (USHORT)(FatDate.Day);
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TimeFields.Hour = (USHORT)0;
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TimeFields.Minute = (USHORT)0;
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TimeFields.Second = (USHORT)0;
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TimeFields.Milliseconds = (USHORT)0;
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//
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// Convert the time field record to Nt LARGE_INTEGER, and set it to zero
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// if we were given a bogus time.
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//
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if (!RtlTimeFieldsToTime( &TimeFields, &Time )) {
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Time.LowPart = 0;
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Time.HighPart = 0;
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} else {
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ExLocalTimeToSystemTime( &Time, &Time );
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}
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return Time;
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UNREFERENCED_PARAMETER( IrpContext );
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}
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LARGE_INTEGER
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FatFatTimeToNtTime (
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IN PIRP_CONTEXT IrpContext,
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IN FAT_TIME_STAMP FatTime,
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IN UCHAR TenMilliSeconds
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)
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/*++
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Routine Description:
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This routine converts a Fat time value pair to its corresponding Nt GMT
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Time value.
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Arguments:
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FatTime - Supplies the Fat Time to convert from
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TenMilliSeconds - A 10 Milisecond resolution
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Return Value:
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LARGE_INTEGER - Receives the corresponding Nt GMT Time value
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--*/
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{
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TIME_FIELDS TimeFields;
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LARGE_INTEGER Time;
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//
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// Pack the input time/date into a time field record
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//
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TimeFields.Year = (USHORT)(FatTime.Date.Year + 1980);
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TimeFields.Month = (USHORT)(FatTime.Date.Month);
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TimeFields.Day = (USHORT)(FatTime.Date.Day);
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TimeFields.Hour = (USHORT)(FatTime.Time.Hour);
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TimeFields.Minute = (USHORT)(FatTime.Time.Minute);
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TimeFields.Second = (USHORT)(FatTime.Time.DoubleSeconds * 2);
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if (TenMilliSeconds != 0) {
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TimeFields.Second += (USHORT)(TenMilliSeconds / 100);
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TimeFields.Milliseconds = (USHORT)((TenMilliSeconds % 100) * 10);
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} else {
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TimeFields.Milliseconds = (USHORT)0;
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}
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//
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// If the second value is greater than 59 then we truncate it to 0.
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// Note that this can't happen with a proper FAT timestamp.
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//
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if (TimeFields.Second > 59) {
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TimeFields.Second = 0;
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}
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//
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// Convert the time field record to Nt LARGE_INTEGER, and set it to zero
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// if we were given a bogus time.
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//
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if (!RtlTimeFieldsToTime( &TimeFields, &Time )) {
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Time.LowPart = 0;
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Time.HighPart = 0;
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} else {
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ExLocalTimeToSystemTime( &Time, &Time );
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}
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return Time;
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UNREFERENCED_PARAMETER( IrpContext );
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}
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FAT_TIME_STAMP
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FatGetCurrentFatTime (
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IN PIRP_CONTEXT IrpContext
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)
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/*++
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Routine Description:
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This routine returns the current system time in Fat time
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Arguments:
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Return Value:
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FAT_TIME_STAMP - Receives the current system time
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--*/
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{
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LARGE_INTEGER Time;
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TIME_FIELDS TimeFields;
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FAT_TIME_STAMP FatTime;
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//
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// Get the current system time, and map it into a time field record.
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//
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KeQuerySystemTime( &Time );
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ExSystemTimeToLocalTime( &Time, &Time );
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//
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// Always add almost two seconds to round up to the nearest double second.
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//
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Time.QuadPart = Time.QuadPart + AlmostTwoSeconds;
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(VOID)RtlTimeToTimeFields( &Time, &TimeFields );
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//
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// Now simply copy over the information
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//
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FatTime.Time.DoubleSeconds = (USHORT)(TimeFields.Second / 2);
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FatTime.Time.Minute = (USHORT)(TimeFields.Minute);
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FatTime.Time.Hour = (USHORT)(TimeFields.Hour);
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FatTime.Date.Year = (USHORT)(TimeFields.Year - 1980);
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FatTime.Date.Month = (USHORT)(TimeFields.Month);
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FatTime.Date.Day = (USHORT)(TimeFields.Day);
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UNREFERENCED_PARAMETER( IrpContext );
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return FatTime;
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}
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