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// **************************************************************************
// * This file is part of the FreeFileSync project. It is distributed under *
// * GNU General Public License: http://www.gnu.org/licenses/gpl.html *
// * Copyright (C) Zenju (zenju AT gmx DOT de) - All Rights Reserved *
// **************************************************************************
#ifndef FFS_LARGE_64_BIT_INTEGER_H_INCLUDED
#define FFS_LARGE_64_BIT_INTEGER_H_INCLUDED
#include <cstdint>
#ifdef ZEN_WIN
#include "win.h"
#endif
namespace zen
{
#ifdef ZEN_WIN
inline
std::int64_t get64BitInt(DWORD low, LONG high)
{
static_assert(sizeof(low) + sizeof(high) == sizeof(std::int64_t), "");
LARGE_INTEGER cvt = {};
cvt.LowPart = low;
cvt.HighPart = high;
return cvt.QuadPart;
}
std::int64_t get64BitInt(std::uint64_t low, std::int64_t high) = delete;
inline
std::uint64_t get64BitUInt(DWORD low, DWORD high)
{
static_assert(sizeof(low) + sizeof(high) == sizeof(std::uint64_t), "");
ULARGE_INTEGER cvt = {};
cvt.LowPart = low;
cvt.HighPart = high;
return cvt.QuadPart;
}
std::int64_t get64BitUInt(std::uint64_t low, std::uint64_t high) = delete;
//convert FILETIME (number of 100-nanosecond intervals since January 1, 1601 UTC)
// to time_t (number of seconds since Jan. 1st 1970 UTC)
//
//FAT32 time is preserved exactly: FAT32 -> toTimeT -> tofiletime -> FAT32
inline
std::int64_t filetimeToTimeT(const FILETIME& ft)
{
return static_cast<std::int64_t>(get64BitUInt(ft.dwLowDateTime, ft.dwHighDateTime) / 10000000U) - get64BitInt(3054539008UL, 2); //caveat: signed/unsigned arithmetics!
//timeshift between ansi C time and FILETIME in seconds == 11644473600s
}
inline
FILETIME timetToFileTime(std::int64_t utcTime)
{
ULARGE_INTEGER cvt = {};
cvt.QuadPart = (utcTime + get64BitInt(3054539008UL, 2)) * 10000000U; //caveat: signed/unsigned arithmetics!
const FILETIME output = { cvt.LowPart, cvt.HighPart };
return output;
}
#endif
}
#endif //FFS_LARGE_64_BIT_INTEGER_H_INCLUDED
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