1 files changed, 234 insertions, 0 deletions

diff --git a/CPP/Windows/TimeUtils.cpp b/CPP/Windows/TimeUtils.cpp
new file mode 100644
index 0000000..1f1335f
--- /dev/null
+++ b/CPP/Windows/TimeUtils.cpp
@@ -0,0 +1,234 @@
+// Windows/TimeUtils.cpp
+
+#include "StdAfx.h"
+
+#ifndef _WIN32
+#include <sys/time.h>
+#endif
+
+#include "Defs.h"
+#include "TimeUtils.h"
+
+namespace NWindows {
+namespace NTime {
+
+static const UInt32 kNumTimeQuantumsInSecond = 10000000;
+static const UInt32 kFileTimeStartYear = 1601;
+#if !defined(_WIN32) || defined(UNDER_CE)
+static const UInt32 kDosTimeStartYear = 1980;
+#endif
+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;
+
+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
+
+#define PERIOD_4 (4 * 365 + 1)
+#define PERIOD_100 (PERIOD_4 * 25 - 1)
+#define PERIOD_400 (PERIOD_100 * 4 + 1)
+
+  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;
+}
+
+UInt64 UnixTimeToFileTime64(UInt32 unixTime) throw()
+{
+  return (kUnixTimeOffset + (UInt64)unixTime) * kNumTimeQuantumsInSecond;
+}
+
+void UnixTimeToFileTime(UInt32 unixTime, FILETIME &ft) throw()
+{
+  UInt64 v = UnixTimeToFileTime64(unixTime);
+  ft.dwLowDateTime = (DWORD)v;
+  ft.dwHighDateTime = (DWORD)(v >> 32);
+}
+
+UInt64 UnixTime64ToFileTime64(Int64 unixTime) throw()
+{
+  return (UInt64)((Int64)kUnixTimeOffset + unixTime) * kNumTimeQuantumsInSecond;
+}
+
+bool UnixTime64ToFileTime(Int64 unixTime, FILETIME &ft) throw()
+{
+  if (unixTime > (Int64)(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) - (Int64)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 _WIN32
+
+  #ifdef UNDER_CE
+  SYSTEMTIME st;
+  GetSystemTime(&st);
+  SystemTimeToFileTime(&st, &ft);
+  #else
+  GetSystemTimeAsFileTime(&ft);
+  #endif
+
+  #else
+  
+  UInt64 v = 0;
+  struct timeval now;
+  if (gettimeofday(&now, 0 ) == 0)
+  {
+    v = ((UInt64)now.tv_sec + kUnixTimeOffset) *
+      kNumTimeQuantumsInSecond + (UInt64)now.tv_usec * 10;
+  }
+  ft.dwLowDateTime  = (DWORD)v;
+  ft.dwHighDateTime = (DWORD)(v >> 32);
+
+  #endif
+}
+
+}}