79 lines
2.7 KiB
C++
Executable File
79 lines
2.7 KiB
C++
Executable File
#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: 2008-02-27 15:00:24 -0500 (Wed, 27 Feb 2008) $
|
|
*/
|
|
|
|
/*! @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 <windows.h>
|
|
#include <boost/cstdint.hpp>
|
|
#include <boost/date_time/time.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 FILETIME's sub second value
|
|
* will be truncated. Nanosecond resolution has no truncation. */
|
|
template<class time_type>
|
|
inline
|
|
time_type time_from_ftime(const FILETIME& ft){
|
|
typedef typename time_type::date_type date_type;
|
|
typedef typename time_type::date_duration_type date_duration_type;
|
|
typedef typename time_type::time_duration_type time_duration_type;
|
|
|
|
/* OFFSET is difference between 1970-Jan-01 & 1601-Jan-01
|
|
* in 100-nanosecond intervals */
|
|
uint64_t c1 = 27111902UL;
|
|
uint64_t c2 = 3577643008UL; // issues warning without 'UL'
|
|
const uint64_t OFFSET = (c1 << 32) + c2;
|
|
const long sec_pr_day = 86400; // seconds per day
|
|
|
|
uint64_t filetime = ft.dwHighDateTime;
|
|
filetime <<= 32;
|
|
filetime += ft.dwLowDateTime;
|
|
filetime -= OFFSET; // filetime is now 100-nanos since 1970-Jan-01
|
|
|
|
uint64_t sec = filetime / 10000000;
|
|
#if defined(BOOST_DATE_TIME_POSIX_TIME_STD_CONFIG)
|
|
uint64_t sub_sec = (filetime % 10000000) * 100; // nanoseconds
|
|
#else
|
|
uint64_t sub_sec = (filetime % 10000000) / 10; // truncate to microseconds
|
|
#endif
|
|
|
|
// split sec into usable chunks: days, hours, minutes, & seconds
|
|
long _d = sec / sec_pr_day;
|
|
long tmp = sec % sec_pr_day;
|
|
long _h = tmp / 3600; // sec_pr_hour
|
|
tmp %= 3600;
|
|
long _m = tmp / 60; // sec_pr_min
|
|
tmp %= 60;
|
|
long _s = tmp; // seconds
|
|
|
|
date_duration_type dd(_d);
|
|
date_type d = date_type(1970, Jan, 01) + dd;
|
|
return time_type(d, time_duration_type(_h, _m, _s, sub_sec));
|
|
}
|
|
|
|
}} // boost::date_time
|
|
|
|
#endif // BOOST_HAS_FTIME
|
|
|
|
#endif // DATE_TIME_FILETIME_FUNCTIONS_HPP__
|