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// Windows/TimeUtils.cpp
#include "StdAfx.h"
#include "Defs.h"
#include "TimeUtils.h"
namespace NWindows {
namespace NTime {
static const UInt32 kNumTimeQuantumsInSecond = 10000000;
static const UInt32 kFileTimeStartYear = 1601;
static const UInt32 kDosTimeStartYear = 1980;
static const UInt32 kUnixTimeStartYear = 1970;
static const UInt64 kUnixTimeOffset =
(UInt64)60 * 60 * 24 * (89 + 365 * (kUnixTimeStartYear - kFileTimeStartYear));
static const UInt64 kNumSecondsInFileTime = (UInt64)(Int64)-1 / kNumTimeQuantumsInSecond;
bool DosTimeToFileTime(UInt32 dosTime, FILETIME &ft) throw()
{
#if defined(_WIN32) && !defined(UNDER_CE)
return BOOLToBool(::DosDateTimeToFileTime((UInt16)(dosTime >> 16), (UInt16)(dosTime & 0xFFFF), &ft));
#else
ft.dwLowDateTime = 0;
ft.dwHighDateTime = 0;
UInt64 res;
if (!GetSecondsSince1601(kDosTimeStartYear + (dosTime >> 25), (dosTime >> 21) & 0xF, (dosTime >> 16) & 0x1F,
(dosTime >> 11) & 0x1F, (dosTime >> 5) & 0x3F, (dosTime & 0x1F) * 2, res))
return false;
res *= kNumTimeQuantumsInSecond;
ft.dwLowDateTime = (UInt32)res;
ft.dwHighDateTime = (UInt32)(res >> 32);
return true;
#endif
}
static const UInt32 kHighDosTime = 0xFF9FBF7D;
static const UInt32 kLowDosTime = 0x210000;
#define PERIOD_4 (4 * 365 + 1)
#define PERIOD_100 (PERIOD_4 * 25 - 1)
#define PERIOD_400 (PERIOD_100 * 4 + 1)
bool FileTimeToDosTime(const FILETIME &ft, UInt32 &dosTime) throw()
{
#if defined(_WIN32) && !defined(UNDER_CE)
WORD datePart, timePart;
if (!::FileTimeToDosDateTime(&ft, &datePart, &timePart))
{
dosTime = (ft.dwHighDateTime >= 0x01C00000) ? kHighDosTime : kLowDosTime;
return false;
}
dosTime = (((UInt32)datePart) << 16) + timePart;
#else
unsigned year, mon, day, hour, min, sec;
UInt64 v64 = ft.dwLowDateTime | ((UInt64)ft.dwHighDateTime << 32);
Byte ms[] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
unsigned temp;
UInt32 v;
v64 += (kNumTimeQuantumsInSecond * 2 - 1);
v64 /= kNumTimeQuantumsInSecond;
sec = (unsigned)(v64 % 60);
v64 /= 60;
min = (unsigned)(v64 % 60);
v64 /= 60;
hour = (unsigned)(v64 % 24);
v64 /= 24;
v = (UInt32)v64;
year = (unsigned)(kFileTimeStartYear + v / PERIOD_400 * 400);
v %= PERIOD_400;
temp = (unsigned)(v / PERIOD_100);
if (temp == 4)
temp = 3;
year += temp * 100;
v -= temp * PERIOD_100;
temp = v / PERIOD_4;
if (temp == 25)
temp = 24;
year += temp * 4;
v -= temp * PERIOD_4;
temp = v / 365;
if (temp == 4)
temp = 3;
year += temp;
v -= temp * 365;
if (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0))
ms[1] = 29;
for (mon = 1; mon <= 12; mon++)
{
unsigned s = ms[mon - 1];
if (v < s)
break;
v -= s;
}
day = (unsigned)v + 1;
dosTime = kLowDosTime;
if (year < kDosTimeStartYear)
return false;
year -= kDosTimeStartYear;
dosTime = kHighDosTime;
if (year >= 128)
return false;
dosTime = (year << 25) | (mon << 21) | (day << 16) | (hour << 11) | (min << 5) | (sec >> 1);
#endif
return true;
}
void UnixTimeToFileTime(UInt32 unixTime, FILETIME &ft) throw()
{
UInt64 v = (kUnixTimeOffset + (UInt64)unixTime) * kNumTimeQuantumsInSecond;
ft.dwLowDateTime = (DWORD)v;
ft.dwHighDateTime = (DWORD)(v >> 32);
}
bool UnixTime64ToFileTime(Int64 unixTime, FILETIME &ft) throw()
{
if (unixTime > kNumSecondsInFileTime - kUnixTimeOffset)
{
ft.dwLowDateTime = ft.dwHighDateTime = (UInt32)(Int32)-1;
return false;
}
Int64 v = (Int64)kUnixTimeOffset + unixTime;
if (v < 0)
{
ft.dwLowDateTime = ft.dwHighDateTime = 0;
return false;
}
UInt64 v2 = (UInt64)v * kNumTimeQuantumsInSecond;
ft.dwLowDateTime = (DWORD)v2;
ft.dwHighDateTime = (DWORD)(v2 >> 32);
return true;
}
Int64 FileTimeToUnixTime64(const FILETIME &ft) throw()
{
UInt64 winTime = (((UInt64)ft.dwHighDateTime) << 32) + ft.dwLowDateTime;
return (Int64)(winTime / kNumTimeQuantumsInSecond) - kUnixTimeOffset;
}
bool FileTimeToUnixTime(const FILETIME &ft, UInt32 &unixTime) throw()
{
UInt64 winTime = (((UInt64)ft.dwHighDateTime) << 32) + ft.dwLowDateTime;
winTime /= kNumTimeQuantumsInSecond;
if (winTime < kUnixTimeOffset)
{
unixTime = 0;
return false;
}
winTime -= kUnixTimeOffset;
if (winTime > 0xFFFFFFFF)
{
unixTime = 0xFFFFFFFF;
return false;
}
unixTime = (UInt32)winTime;
return true;
}
bool GetSecondsSince1601(unsigned year, unsigned month, unsigned day,
unsigned hour, unsigned min, unsigned sec, UInt64 &resSeconds) throw()
{
resSeconds = 0;
if (year < kFileTimeStartYear || year >= 10000 || month < 1 || month > 12 ||
day < 1 || day > 31 || hour > 23 || min > 59 || sec > 59)
return false;
UInt32 numYears = year - kFileTimeStartYear;
UInt32 numDays = numYears * 365 + numYears / 4 - numYears / 100 + numYears / 400;
Byte ms[] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
if (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0))
ms[1] = 29;
month--;
for (unsigned i = 0; i < month; i++)
numDays += ms[i];
numDays += day - 1;
resSeconds = ((UInt64)(numDays * 24 + hour) * 60 + min) * 60 + sec;
return true;
}
void GetCurUtcFileTime(FILETIME &ft) throw()
{
// Both variants provide same low resolution on WinXP: about 15 ms.
// But GetSystemTimeAsFileTime is much faster.
#ifdef UNDER_CE
SYSTEMTIME st;
GetSystemTime(&st);
SystemTimeToFileTime(&st, &ft);
#else
GetSystemTimeAsFileTime(&ft);
#endif
}
}}
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