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/*
* Copyright 2013-2019 Max Kellermann <max.kellermann@gmail.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef FILE_TIME_HXX
#define FILE_TIME_HXX
#include <fileapi.h>
#include <chrono>
#include <cstdint>
constexpr uint64_t
ConstructUint64(DWORD lo, DWORD hi) noexcept
{
return uint64_t(lo) | (uint64_t(hi) << 32);
}
constexpr uint64_t
ToUint64(FILETIME ft) noexcept
{
return ConstructUint64(ft.dwLowDateTime, ft.dwHighDateTime);
}
constexpr time_t
FileTimeToTimeT(FILETIME ft) noexcept
{
return (ToUint64(ft) - 116444736000000000) / 10000000;
}
inline std::chrono::system_clock::time_point
FileTimeToChrono(FILETIME ft) noexcept
{
// TODO: eliminate the time_t roundtrip, preserve sub-second resolution
return std::chrono::system_clock::from_time_t(FileTimeToTimeT(ft));
}
constexpr std::chrono::seconds
DeltaFileTimeS(FILETIME a, FILETIME b) noexcept
{
return std::chrono::seconds((ToUint64(a) - ToUint64(b)) / 10000000);
}
#endif
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