misc/libphysfs/lzma/CPP/Windows/Time.h
author Wuzzy <almikes@aol.com>
Sat, 15 Apr 2017 23:21:13 +0200
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// Windows/Time.h
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#ifndef __WINDOWS_TIME_H
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#define __WINDOWS_TIME_H
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#include "Common/Types.h"
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#include "Windows/Defs.h"
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namespace NWindows {
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namespace NTime {
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inline bool DosTimeToFileTime(UInt32 dosTime, FILETIME &fileTime)
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{
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  return BOOLToBool(::DosDateTimeToFileTime(UInt16(dosTime >> 16), 
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      UInt16(dosTime & 0xFFFF), &fileTime));
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}
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const UInt32 kHighDosTime = 0xFF9FBF7D;
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const UInt32 kLowDosTime = 0x210000;
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inline bool FileTimeToDosTime(const FILETIME &fileTime, UInt32 &dosTime)
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{
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  WORD datePart, timePart;
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  if (!::FileTimeToDosDateTime(&fileTime, &datePart, &timePart))
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  {
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    if (fileTime.dwHighDateTime >= 0x01C00000) // 2000
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      dosTime = kHighDosTime;
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    else
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      dosTime = kLowDosTime;
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    return false;
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  }
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  dosTime = (((UInt32)datePart) << 16) + timePart;
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  return true;
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}
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const UInt32 kNumTimeQuantumsInSecond = 10000000;
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const UInt64 kUnixTimeStartValue = ((UInt64)kNumTimeQuantumsInSecond) * 60 * 60 * 24 * 134774;
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inline void UnixTimeToFileTime(UInt32 unixTime, FILETIME &fileTime)
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{
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  UInt64 v = kUnixTimeStartValue + ((UInt64)unixTime) * kNumTimeQuantumsInSecond;
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  fileTime.dwLowDateTime = (DWORD)v;
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  fileTime.dwHighDateTime = (DWORD)(v >> 32);
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}
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inline bool FileTimeToUnixTime(const FILETIME &fileTime, UInt32 &unixTime)
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{
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  UInt64 winTime = (((UInt64)fileTime.dwHighDateTime) << 32) + fileTime.dwLowDateTime;
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  if (winTime < kUnixTimeStartValue)
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  {
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    unixTime = 0;
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    return false;
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  }
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  winTime = (winTime - kUnixTimeStartValue) / kNumTimeQuantumsInSecond;
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  if (winTime > 0xFFFFFFFF)
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  {
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    unixTime = 0xFFFFFFFF;
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    return false;
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  }
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  unixTime = (UInt32)winTime;
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  return true;
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}
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}}
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#endif