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/**************************************************************************
**
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Installer Framework.
**
** $QT_BEGIN_LICENSE:GPL-EXCEPT$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
**************************************************************************/
#include "windows.h"
#include <QDateTime>
#include <chrono>
/*
MSDN description about FILETIME structure:
The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals
since January 1, 1601 (UTC).
The DeltaToEpochInMsec can be calculated like this:
\code
quint64 delta = quint64(QDateTime(QDate(1601, 1, 1)).msecsTo(QDateTime(QDate(1970, 1, 1))))
* 10000ULL;
\endcode
But since the value is static, we use a precalculated number here.
*/
static const ULONGLONG DeltaToEpochInMsec = 116444736000000000ULL;
inline void LocalDateTimeToFileTime(const QDateTime &dt, ULONGLONG utcOffsetInMsec, FILETIME *ft)
{
const ULONGLONG msec = dt.toMSecsSinceEpoch() + utcOffsetInMsec;
const ULONGLONG nano100 = (msec * 10000ULL) + DeltaToEpochInMsec;
ft->dwLowDateTime = nano100;
ft->dwHighDateTime = nano100 >> 32;
}
inline void UTCDateTimeToSystemTime(const QDateTime &dt, SYSTEMTIME *st)
{
const QDate date = dt.date();
const QTime time = dt.time();
st->wYear = date.year();
st->wMonth = date.month();
st->wDayOfWeek = date.dayOfWeek();
st->wDay = date.day();
st->wHour = time.hour();
st->wMinute = time.minute();
st->wSecond = time.second();
st->wMilliseconds = time.msec();
}
// -- WINAPI
BOOL WINAPI FileTimeToSystemTime(CONST FILETIME *source,SYSTEMTIME *target)
{
const QDateTime dt = QDateTime(QDate(1601, 1, 1), QTime(0, 0, 0, 1), Qt::UTC).addMSecs
((ULONGLONG(source->dwLowDateTime) + (ULONGLONG(source->dwHighDateTime) << 32)) / 10000ULL);
UTCDateTimeToSystemTime(dt.toUTC(), target);
return TRUE;
}
BOOL WINAPI FileTimeToLocalFileTime(CONST FILETIME *source,FILETIME *target)
{
const QDateTime dt = QDateTime(QDate(1601, 1, 1), QTime(0, 0, 0, 1), Qt::UTC).addMSecs
((ULONGLONG(source->dwLowDateTime) + (ULONGLONG(source->dwHighDateTime) << 32)) / 10000ULL);
LocalDateTimeToFileTime(dt.toLocalTime(), ULONGLONG(QDateTime::currentDateTime()
.offsetFromUtc()) * 1000ULL, target);
return TRUE;
}
BOOLEAN WINAPI RtlTimeToSecondsSince1970(const LARGE_INTEGER *Time, DWORD *Seconds)
{
/*
MSDN suggests to implement the function like this:
1. Call SystemTimeToFileTime to copy the system time to a FILETIME structure. Call
GetSystemTime to get the current system time to pass to SystemTimeToFileTime.
2. Copy the contents of the FILETIME structure to a ULARGE_INTEGER structure.
3. Initialize a SYSTEMTIME structure with the date and time of the first second of
January 1, 1970.
4. Call SystemTimeToFileTime, passing the SYSTEMTIME structure initialized in Step 3
to the call.
5. Copy the contents of the FILETIME structure returned by SystemTimeToFileTime in Step 4
to a second ULARGE_INTEGER. The copied value should be less than or equal to the value
copied in Step 2.
6. Subtract the 64-bit value in the ULARGE_INTEGER structure initialized in Step 5
(January 1, 1970) from the 64-bit value of the ULARGE_INTEGER structure initialized
in Step 2 (the current system time). This produces a value in 100-nanosecond intervals
since January 1, 1970. To convert this value to seconds, divide by 10,000,000.
We can omit step 1 and 2, cause we get the LARGE_INTEGER passed as function argument.
*/
SYSTEMTIME stFirstSecondOf1979;
stFirstSecondOf1979.wSecond = 1;
stFirstSecondOf1979.wMinute = 0;
stFirstSecondOf1979.wHour = 0;
stFirstSecondOf1979.wDay = 1;
stFirstSecondOf1979.wMonth = 1;
stFirstSecondOf1979.wYear = 1970;
stFirstSecondOf1979.wDayOfWeek = 4;
FILETIME ftFirstSecondOf1979;
SystemTimeToFileTime(&stFirstSecondOf1979, &ftFirstSecondOf1979);
LARGE_INTEGER liFirstSecondOf1979;
liFirstSecondOf1979.LowPart = ftFirstSecondOf1979.dwLowDateTime;
liFirstSecondOf1979.HighPart = ftFirstSecondOf1979.dwHighDateTime;
const ULONGLONG diffNano100 = Time->QuadPart - liFirstSecondOf1979.QuadPart;
*Seconds = diffNano100 / 10000000ULL;
return TRUE;
}
void WINAPI RtlSecondsSince1970ToFileTime(DWORD Seconds, FILETIME *ft)
{
const ULONGLONG nano100 = (ULONGLONG(Seconds) * 10000000ULL) + DeltaToEpochInMsec;
ft->dwLowDateTime = nano100;
ft->dwHighDateTime = nano100 >> 32;
}
VOID WINAPI GetSystemTime(SYSTEMTIME *st)
{
UTCDateTimeToSystemTime(QDateTime::currentDateTimeUtc(), st);
}
VOID WINAPI GetSystemTimeAsFileTime(FILETIME *time)
{
SYSTEMTIME st;
GetSystemTime(&st);
SystemTimeToFileTime(&st, time);
}
DWORD WINAPI GetTickCount()
{
using namespace std::chrono;
return duration_cast<milliseconds>(steady_clock::now().time_since_epoch()).count();
}
BOOL WINAPI SystemTimeToFileTime(const SYSTEMTIME *lpSystemTime, FILETIME *lpFileTime)
{
const QDateTime dt(QDate(lpSystemTime->wYear, lpSystemTime->wMonth, lpSystemTime->wDay),
QTime(lpSystemTime->wHour, lpSystemTime->wMinute, lpSystemTime->wSecond,
lpSystemTime->wMilliseconds), Qt::UTC);
LocalDateTimeToFileTime(dt.toLocalTime(), 0ULL, lpFileTime);
return TRUE;
}
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