172 lines
3.7 KiB
C
172 lines
3.7 KiB
C
/*++
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Copyright (c) 1998 Microsoft Corporation
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Module Name:
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rtl.c
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Abstract:
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All routines are copied from NT sources tree (NTOS\rtl)
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Author:
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Rong Chen [RONGC] 26-Oct-1998
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Environment:
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Pure utility routine
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--*/
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#define _NTSYSTEM_ 1 // see ntdef.h. We can't use DECLSPEC_IMPORT here
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#include <nt.h>
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#include <ntdef.h>
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#include <ntrtl.h>
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#include <nturtl.h>
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#include <string.h>
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#include <windows.h>
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NTSYSAPI NTSTATUS NTAPI
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RtlInitializeCriticalSection(PRTL_CRITICAL_SECTION CriticalSection)
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{
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// HACK - Win9x might go nuts as we can't check error return (who cares?)
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//
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InitializeCriticalSection(CriticalSection);
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return STATUS_SUCCESS;
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}
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NTSYSAPI NTSTATUS NTAPI
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RtlDeleteCriticalSection(PRTL_CRITICAL_SECTION CriticalSection)
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{
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DeleteCriticalSection(CriticalSection);
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return STATUS_SUCCESS;
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}
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NTSYSAPI VOID NTAPI
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RtlInitAnsiString(
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OUT PANSI_STRING DestinationString,
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IN PCSZ SourceString OPTIONAL
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)
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/*++
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Routine Description:
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The RtlInitAnsiString function initializes an NT counted string.
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The DestinationString is initialized to point to the SourceString
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and the Length and MaximumLength fields of DestinationString are
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initialized to the length of the SourceString, which is zero if
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SourceString is not specified.
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Arguments:
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DestinationString - Pointer to the counted string to initialize
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SourceString - Optional pointer to a null terminated string that
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the counted string is to point to.
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Return Value:
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None.
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--*/
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{
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ULONG Length;
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DestinationString->Buffer = (PCHAR)SourceString;
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if (ARGUMENT_PRESENT( SourceString )) {
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Length = strlen(SourceString);
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DestinationString->Length = (USHORT)Length;
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DestinationString->MaximumLength = (USHORT)(Length+1);
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}
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else {
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DestinationString->Length = 0;
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DestinationString->MaximumLength = 0;
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}
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}
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LARGE_INTEGER SecondsToStartOf1980 = {0xc8df3700, 0x00000002};
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LARGE_INTEGER Magic10000000 = {0xe57a42bd, 0xd6bf94d5};
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#define SHIFT10000000 23
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#define Convert100nsToSeconds(LARGE_INTEGER) ( \
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RtlExtendedMagicDivide( (LARGE_INTEGER), Magic10000000, SHIFT10000000 ) \
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)
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NTSYSAPI BOOLEAN NTAPI
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RtlTimeToSecondsSince1980 (
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IN PLARGE_INTEGER Time,
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OUT PULONG ElapsedSeconds
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)
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/*++
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Routine Description:
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This routine converts an input 64-bit NT Time variable to the
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number of seconds since the start of 1980. The NT time must be
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within the range 1980 to around 2115.
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Arguments:
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Time - Supplies the Time to convert from
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ElapsedSeconds - Receives the number of seconds since the start of 1980
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denoted by Time
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Return Value:
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BOOLEAN - TRUE if the input Time is within a range expressible by
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ElapsedSeconds and FALSE otherwise
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--*/
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{
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LARGE_INTEGER Seconds;
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//
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// First convert time to seconds since 1601
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//
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Seconds = Convert100nsToSeconds( *(PLARGE_INTEGER)Time );
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//
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// Then subtract the number of seconds from 1601 to 1980.
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//
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Seconds.QuadPart = Seconds.QuadPart - SecondsToStartOf1980.QuadPart;
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//
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// If the results is negative then the date was before 1980 or if
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// the results is greater than a ulong then its too far in the
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// future so we return FALSE
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//
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if (Seconds.HighPart != 0) {
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return FALSE;
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}
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//
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// Otherwise we have the answer
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//
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*ElapsedSeconds = Seconds.LowPart;
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//
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// And return to our caller
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//
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return TRUE;
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}
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