#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 #if defined(BOOST_USE_WINDOWS_H) # include <windows.h> #endif #include <boost/cstdint.hpp> #include <boost/date_time/time.hpp> #include <boost/date_time/date_defs.hpp> namespace boost { namespace date_time { namespace winapi { #if !defined(BOOST_USE_WINDOWS_H) extern "C" { struct FILETIME { boost::uint32_t dwLowDateTime; boost::uint32_t dwHighDateTime; }; struct SYSTEMTIME { boost::uint16_t wYear; boost::uint16_t wMonth; boost::uint16_t wDayOfWeek; boost::uint16_t wDay; boost::uint16_t wHour; boost::uint16_t wMinute; boost::uint16_t wSecond; boost::uint16_t wMilliseconds; }; __declspec(dllimport) void __stdcall GetSystemTimeAsFileTime(FILETIME* lpFileTime); __declspec(dllimport) int __stdcall FileTimeToLocalFileTime(const FILETIME* lpFileTime, FILETIME* lpLocalFileTime); __declspec(dllimport) void __stdcall GetSystemTime(SYSTEMTIME* lpSystemTime); __declspec(dllimport) int __stdcall SystemTimeToFileTime(const SYSTEMTIME* lpSystemTime, FILETIME* lpFileTime); } // extern "C" #endif // defined(BOOST_USE_WINDOWS_H) typedef FILETIME file_time; typedef SYSTEMTIME system_time; inline void get_system_time_as_file_time(file_time& ft) { #if BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3205)) // Some runtime library implementations expect local times as the norm for ctime. file_time ft_utc; GetSystemTimeAsFileTime(&ft_utc); FileTimeToLocalFileTime(&ft_utc, &ft); #elif defined(BOOST_HAS_GETSYSTEMTIMEASFILETIME) GetSystemTimeAsFileTime(&ft); #else system_time st; GetSystemTime(&st); SystemTimeToFileTime(&st, &ft); #endif } /*! * The function converts file_time into number of microseconds elapsed since 1970-Jan-01 * * \note Only dates after 1970-Jan-01 are supported. Dates before will be wrapped. * * \note The function is templated on the FILETIME type, so that * it can be used with both native FILETIME and the ad-hoc * boost::date_time::winapi::file_time type. */ template< typename FileTimeT > inline boost::uint64_t file_time_to_microseconds(FileTimeT const& ft) { /* shift is difference between 1970-Jan-01 & 1601-Jan-01 * in 100-nanosecond intervals */ const uint64_t shift = 116444736000000000ULL; // (27111902 << 32) + 3577643008 union { FileTimeT as_file_time; uint64_t as_integer; // 100-nanos since 1601-Jan-01 } caster; caster.as_file_time = ft; caster.as_integer -= shift; // filetime is now 100-nanos since 1970-Jan-01 return (caster.as_integer / 10); // truncate to microseconds } } // namespace winapi //! 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::date_time::winapi::file_time 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 file_time_to_microseconds function. This allows to // avoid integer wrapping for dates before 1970-Jan-01. union { FileTimeT as_file_time; uint64_t as_integer; // 100-nanos since 1601-Jan-01 } caster; caster.as_file_time = ft; uint64_t sec = caster.as_integer / 10000000UL; uint32_t sub_sec = (caster.as_integer % 10000000UL) // 100-nanoseconds since the last second #if !defined(BOOST_DATE_TIME_POSIX_TIME_STD_CONFIG) / 10; // microseconds since the last second #else * 100; // 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__