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