1 // Windows/Time.h

     2 

     3 #ifndef __WINDOWS_TIME_H

     4 #define __WINDOWS_TIME_H

     5 

     6 #include "Common/Types.h"

     7 #include "Windows/Defs.h"

     8 

     9 namespace NWindows {

    10 namespace NTime {

    11 

    12 inline bool DosTimeToFileTime(UInt32 dosTime, FILETIME &fileTime)

    13 {

    14   return BOOLToBool(::DosDateTimeToFileTime(UInt16(dosTime >> 16), 

    15       UInt16(dosTime & 0xFFFF), &fileTime));

    16 }

    17 

    18 const UInt32 kHighDosTime = 0xFF9FBF7D;

    19 const UInt32 kLowDosTime = 0x210000;

    20 

    21 inline bool FileTimeToDosTime(const FILETIME &fileTime, UInt32 &dosTime)

    22 {

    23   WORD datePart, timePart;

    24   if (!::FileTimeToDosDateTime(&fileTime, &datePart, &timePart))

    25   {

    26     if (fileTime.dwHighDateTime >= 0x01C00000) // 2000

    27       dosTime = kHighDosTime;

    28     else

    29       dosTime = kLowDosTime;

    30     return false;

    31   }

    32   dosTime = (((UInt32)datePart) << 16) + timePart;

    33   return true;

    34 }

    35 

    36 const UInt32 kNumTimeQuantumsInSecond = 10000000;

    37 const UInt64 kUnixTimeStartValue = ((UInt64)kNumTimeQuantumsInSecond) * 60 * 60 * 24 * 134774;

    38 

    39 inline void UnixTimeToFileTime(UInt32 unixTime, FILETIME &fileTime)

    40 {

    41   UInt64 v = kUnixTimeStartValue + ((UInt64)unixTime) * kNumTimeQuantumsInSecond;

    42   fileTime.dwLowDateTime = (DWORD)v;

    43   fileTime.dwHighDateTime = (DWORD)(v >> 32);

    44 }

    45 

    46 inline bool FileTimeToUnixTime(const FILETIME &fileTime, UInt32 &unixTime)

    47 {

    48   UInt64 winTime = (((UInt64)fileTime.dwHighDateTime) << 32) + fileTime.dwLowDateTime;

    49   if (winTime < kUnixTimeStartValue)

    50   {

    51     unixTime = 0;

    52     return false;

    53   }

    54   winTime = (winTime - kUnixTimeStartValue) / kNumTimeQuantumsInSecond;

    55   if (winTime > 0xFFFFFFFF)

    56   {

    57     unixTime = 0xFFFFFFFF;

    58     return false;

    59   }

    60   unixTime = (UInt32)winTime;

    61   return true;

    62 }

    63 

    64 }}

    65 

    66 #endif