| 1 | #ifndef DATE_TIME_FILETIME_FUNCTIONS_HPP__ |
|---|
| 2 | #define DATE_TIME_FILETIME_FUNCTIONS_HPP__ |
|---|
| 3 | |
|---|
| 4 | /* Copyright (c) 2004 CrystalClear Software, Inc. |
|---|
| 5 | * Use, modification and distribution is subject to the |
|---|
| 6 | * Boost Software License, Version 1.0. (See accompanying |
|---|
| 7 | * file LICENSE-1.0 or http://www.boost.org/LICENSE-1.0) |
|---|
| 8 | * Author: Jeff Garland, Bart Garst |
|---|
| 9 | * $Date: 2004/08/04 22:06:05 $ |
|---|
| 10 | */ |
|---|
| 11 | |
|---|
| 12 | /*! @file filetime_functions.hpp |
|---|
| 13 | * Function(s) for converting between a FILETIME structure and a |
|---|
| 14 | * time object. This file is only available on systems that have |
|---|
| 15 | * BOOST_HAS_FTIME defined. |
|---|
| 16 | */ |
|---|
| 17 | |
|---|
| 18 | #include <boost/date_time/compiler_config.hpp> |
|---|
| 19 | #if defined(BOOST_HAS_FTIME) // skip this file if no FILETIME |
|---|
| 20 | #include <windows.h> |
|---|
| 21 | #include <boost/cstdint.hpp> |
|---|
| 22 | #include <boost/date_time/time.hpp> |
|---|
| 23 | |
|---|
| 24 | |
|---|
| 25 | namespace boost { |
|---|
| 26 | namespace date_time { |
|---|
| 27 | |
|---|
| 28 | |
|---|
| 29 | //! Create a time object from an initialized FILETIME struct. |
|---|
| 30 | /*! Create a time object from an initialized FILETIME struct. |
|---|
| 31 | * A FILETIME struct holds 100-nanosecond units (0.0000001). When |
|---|
| 32 | * built with microsecond resolution the FILETIME's sub second value |
|---|
| 33 | * will be truncated. Nanosecond resolution has no truncation. */ |
|---|
| 34 | template<class time_type> |
|---|
| 35 | inline |
|---|
| 36 | time_type time_from_ftime(const FILETIME& ft){ |
|---|
| 37 | typedef typename time_type::date_type date_type; |
|---|
| 38 | typedef typename time_type::date_duration_type date_duration_type; |
|---|
| 39 | typedef typename time_type::time_duration_type time_duration_type; |
|---|
| 40 | |
|---|
| 41 | /* OFFSET is difference between 1970-Jan-01 & 1601-Jan-01 |
|---|
| 42 | * in 100-nanosecond intervals */ |
|---|
| 43 | uint64_t c1 = 27111902UL; |
|---|
| 44 | uint64_t c2 = 3577643008UL; // issues warning without 'UL' |
|---|
| 45 | const uint64_t OFFSET = (c1 << 32) + c2; |
|---|
| 46 | const long sec_pr_day = 86400; // seconds per day |
|---|
| 47 | |
|---|
| 48 | uint64_t filetime = ft.dwHighDateTime; |
|---|
| 49 | filetime <<= 32; |
|---|
| 50 | filetime += ft.dwLowDateTime; |
|---|
| 51 | filetime -= OFFSET; // filetime is now 100-nanos since 1970-Jan-01 |
|---|
| 52 | |
|---|
| 53 | uint64_t sec = filetime / 10000000; |
|---|
| 54 | #if defined(BOOST_DATE_TIME_POSIX_TIME_STD_CONFIG) |
|---|
| 55 | uint64_t sub_sec = (filetime % 10000000) * 100; // nanoseconds |
|---|
| 56 | #else |
|---|
| 57 | uint64_t sub_sec = (filetime % 10000000) / 10; // truncate to microseconds |
|---|
| 58 | #endif |
|---|
| 59 | |
|---|
| 60 | // split sec into usable chunks: days, hours, minutes, & seconds |
|---|
| 61 | long _d = sec / sec_pr_day; |
|---|
| 62 | long tmp = sec % sec_pr_day; |
|---|
| 63 | long _h = tmp / 3600; // sec_pr_hour |
|---|
| 64 | tmp %= 3600; |
|---|
| 65 | long _m = tmp / 60; // sec_pr_min |
|---|
| 66 | tmp %= 60; |
|---|
| 67 | long _s = tmp; // seconds |
|---|
| 68 | |
|---|
| 69 | date_duration_type dd(_d); |
|---|
| 70 | date_type d = date_type(1970, Jan, 01) + dd; |
|---|
| 71 | return time_type(d, time_duration_type(_h, _m, _s, sub_sec)); |
|---|
| 72 | } |
|---|
| 73 | |
|---|
| 74 | }} // boost::date_time |
|---|
| 75 | |
|---|
| 76 | #endif // BOOST_HAS_FTIME |
|---|
| 77 | |
|---|
| 78 | #endif // DATE_TIME_FILETIME_FUNCTIONS_HPP__ |
|---|
