time.h

/*++

Copyright (c) 2019 changeofpace. All rights reserved.

Use of this source code is governed by the MIT license. See the 'LICENSE' file
for more information.

--*/

#pragma once

#if defined(_KERNEL_MODE)
#include <fltKernel.h>
#else
#include <Windows.h>
#endif

//
// NT time is measured in units of 100-nanosecond intervals.
//
#define SYSTEM_TIME_UNIT_MICROSECOND    ((LONGLONG)(10))
#define SYSTEM_TIME_UNIT_MILLISECOND    ((LONGLONG)(10000))
#define SYSTEM_TIME_UNIT_SECOND         ((LONGLONG)(10000000))

#define RELATIVE_INTERVAL(Interval)     (-Interval)

FORCEINLINE
VOID
MakeRelativeIntervalSeconds(
    _Inout_ PLARGE_INTEGER pInterval,
    _In_ LONGLONG Seconds
)
{
    pInterval->QuadPart = RELATIVE_INTERVAL(Seconds * SYSTEM_TIME_UNIT_SECOND);
}

FORCEINLINE
VOID
MakeRelativeIntervalMilliseconds(
    _Inout_ PLARGE_INTEGER pInterval,
    _In_ LONGLONG Milliseconds
)
{
    pInterval->QuadPart =
        RELATIVE_INTERVAL(Milliseconds * SYSTEM_TIME_UNIT_MILLISECOND);
}