4.59 beta

CPP/Windows/Time.cpp

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+// Windows/Time.cpp
+
+#include "StdAfx.h"
+
+#include "Time.h"
+#include "Windows/Defs.h"
+
+namespace NWindows {
+namespace NTime {
+
+bool DosTimeToFileTime(UInt32 dosTime, FILETIME &fileTime)
+{
+  return BOOLToBool(::DosDateTimeToFileTime((UInt16)(dosTime >> 16), (UInt16)(dosTime & 0xFFFF), &fileTime));
+}
+
+static const UInt32 kHighDosTime = 0xFF9FBF7D;
+static const UInt32 kLowDosTime = 0x210000;
+
+bool FileTimeToDosTime(const FILETIME &fileTime, UInt32 &dosTime)
+{
+  WORD datePart, timePart;
+  if (!::FileTimeToDosDateTime(&fileTime, &datePart, &timePart))
+  {
+    dosTime = (fileTime.dwHighDateTime >= 0x01C00000) ? kHighDosTime : kLowDosTime;
+    return false;
+  }
+  dosTime = (((UInt32)datePart) << 16) + timePart;
+  return true;
+}
+
+static const UInt32 kNumTimeQuantumsInSecond = 10000000;
+static const UInt64 kUnixTimeStartValue = ((UInt64)kNumTimeQuantumsInSecond) * 60 * 60 * 24 * 134774;
+
+void UnixTimeToFileTime(UInt32 unixTime, FILETIME &fileTime)
+{
+  UInt64 v = kUnixTimeStartValue + ((UInt64)unixTime) * kNumTimeQuantumsInSecond;
+  fileTime.dwLowDateTime = (DWORD)v;
+  fileTime.dwHighDateTime = (DWORD)(v >> 32);
+}
+
+bool FileTimeToUnixTime(const FILETIME &fileTime, UInt32 &unixTime)
+{
+  UInt64 winTime = (((UInt64)fileTime.dwHighDateTime) << 32) + fileTime.dwLowDateTime;
+  if (winTime < kUnixTimeStartValue)
+  {
+    unixTime = 0;
+    return false;
+  }
+  winTime = (winTime - kUnixTimeStartValue) / kNumTimeQuantumsInSecond;
+  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)
+{
+  resSeconds = 0;
+  if (year < 1601 || year >= 10000 || month < 1 || month > 12 ||
+      day < 1 || day > 31 || hour > 23 || min > 59 || sec > 59)
+    return false;
+  UInt32 numYears = year - 1601;
+  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)
+{
+  SYSTEMTIME st;
+  GetSystemTime(&st);
+  SystemTimeToFileTime(&st, &ft);
+}
+
+}}