#ifndef DATE_TIME_FILETIME_FUNCTIONS_HPP__
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#define DATE_TIME_FILETIME_FUNCTIONS_HPP__
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/* Copyright (c) 2004 CrystalClear Software, Inc.
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* Use, modification and distribution is subject to the
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* Boost Software License, Version 1.0. (See accompanying
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* file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
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* Author: Jeff Garland, Bart Garst
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* $Date$
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*/
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/*! @file filetime_functions.hpp
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* Function(s) for converting between a FILETIME structure and a
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* time object. This file is only available on systems that have
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* BOOST_HAS_FTIME defined.
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*/
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#include <boost/date_time/compiler_config.hpp>
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#if defined(BOOST_HAS_FTIME) // skip this file if no FILETIME
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#include <boost/cstdint.hpp>
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#include <boost/date_time/time.hpp>
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#include <boost/date_time/date_defs.hpp>
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namespace boost {
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namespace date_time {
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//! Create a time object from an initialized FILETIME struct.
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/*!
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* Create a time object from an initialized FILETIME struct.
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* A FILETIME struct holds 100-nanosecond units (0.0000001). When
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* built with microsecond resolution the file_time's sub second value
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* will be truncated. Nanosecond resolution has no truncation.
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*
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* \note The function is templated on the FILETIME type, so that
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* it can be used with both native FILETIME and the ad-hoc
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* boost::detail::winapi::FILETIME_ type.
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*/
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template< typename TimeT, typename FileTimeT >
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inline
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TimeT time_from_ftime(const FileTimeT& ft)
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{
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typedef typename TimeT::date_type date_type;
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typedef typename TimeT::date_duration_type date_duration_type;
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typedef typename TimeT::time_duration_type time_duration_type;
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// https://svn.boost.org/trac/boost/ticket/2523
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// Since this function can be called with arbitrary times, including ones that
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// are before 1970-Jan-01, we'll have to cast the time a bit differently,
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// than it is done in the microsec_clock::file_time_to_microseconds function. This allows to
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// avoid integer wrapping for dates before 1970-Jan-01.
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// 100-nanos since 1601-Jan-01
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uint64_t ft_as_integer = (static_cast< uint64_t >(ft.dwHighDateTime) << 32) | static_cast< uint64_t >(ft.dwLowDateTime);
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uint64_t sec = ft_as_integer / 10000000UL;
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uint32_t sub_sec = static_cast< uint32_t >(ft_as_integer % 10000000UL) // 100-nanoseconds since the last second
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#if !defined(BOOST_DATE_TIME_POSIX_TIME_STD_CONFIG)
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/ 10U; // microseconds since the last second
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#else
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* 100U; // nanoseconds since the last second
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#endif
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// split sec into usable chunks: days, hours, minutes, & seconds
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const uint32_t sec_per_day = 86400; // seconds per day
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uint32_t days = static_cast< uint32_t >(sec / sec_per_day);
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uint32_t tmp = static_cast< uint32_t >(sec % sec_per_day);
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uint32_t hours = tmp / 3600; // sec_per_hour
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tmp %= 3600;
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uint32_t minutes = tmp / 60; // sec_per_min
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tmp %= 60;
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uint32_t seconds = tmp; // seconds
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date_duration_type dd(days);
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date_type d = date_type(1601, Jan, 01) + dd;
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return TimeT(d, time_duration_type(hours, minutes, seconds, sub_sec));
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}
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}} // boost::date_time
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#endif // BOOST_HAS_FTIME
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#endif // DATE_TIME_FILETIME_FUNCTIONS_HPP__
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