1 files changed, 2 insertions, 2 deletions
@@ -524,9 +524,9 @@ public: /// \brief Get parent device type for ROM search /// - /// Impement this member in a derived class to declare the parent + /// Implement this member in a derived class to declare the parent /// device type for the purpose of searching for ROMs. Only one pre { line-height: 125%; }
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// copyright-holders:Vas Crabb, Nathan Woods
/*********************************************************************
timeconv.cpp
Time conversion utility code
***************************************************************************/
#include "timeconv.h"
#include <ctime>
namespace util {
namespace {
/***************************************************************************
PROTOTYPES
***************************************************************************/
util::ntfs_duration calculate_ntfs_offset();
/***************************************************************************
GLOBAL VARIABLES
***************************************************************************/
util::ntfs_duration f_ntfs_offset(calculate_ntfs_offset());
/***************************************************************************
IMPLEMENTATION
***************************************************************************/
util::ntfs_duration calculate_ntfs_offset()
{
constexpr auto days_in_year(365);
constexpr auto days_in_four_years((days_in_year * 4) + 1);
constexpr auto days_in_century((days_in_four_years * 25) - 1);
constexpr auto days_in_four_centuries((days_in_century * 4) + 1);
constexpr ntfs_duration day(std::chrono::hours(24));
constexpr ntfs_duration year(day * days_in_year);
constexpr ntfs_duration four_years(day * days_in_four_years);
constexpr ntfs_duration century(day * days_in_century);
constexpr ntfs_duration four_centuries(day * days_in_four_centuries);
std::time_t const zero(0);
std::tm const epoch(*std::gmtime(&zero));
ntfs_duration result(day * epoch.tm_yday);
result += std::chrono::hours(epoch.tm_hour);
result += std::chrono::minutes(epoch.tm_min);
result += std::chrono::seconds(epoch.tm_sec);
int years(1900 - 1601 + epoch.tm_year);
result += four_centuries * (years / 400);
years %= 400;
result += century * (years / 100);
years %= 100;
result += four_years * (years / 4);
years %= 4;
result += year * years;
return result;
}
} // anonymous namespace
// -------------------------------------------------
// system_clock_time_point_from_ntfs_duration
// -------------------------------------------------
std::chrono::system_clock::time_point system_clock_time_point_from_ntfs_duration(ntfs_duration d)
{
return std::chrono::system_clock::from_time_t(0) + std::chrono::duration_cast<std::chrono::system_clock::duration>(d - f_ntfs_offset);
}
} // namespace util
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