1 files changed, 291 insertions, 0 deletions
diff --git a/tools/source/datetime/datetime.cxx b/tools/source/datetime/datetime.cxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+#include <tools/datetime.hxx>
+#include <tools/duration.hxx>
+#include <rtl/math.hxx>
+#include <sal/log.hxx>
+
+#include <systemdatetime.hxx>
+
+DateTime::DateTime(DateTimeInitSystem)
+    : Date( Date::EMPTY )
+    , Time( Time::EMPTY )
+{
+    sal_Int32 nD = 0;
+    sal_Int64 nT = 0;
+    if ( GetSystemDateTime( &nD, &nT ) )
+    {
+        Date::operator=( Date( nD ) );
+        SetTime( nT );
+    }
+    else
+        Date::operator=( Date( 1, 1, 1900 ) ); // Time::nTime is already 0
+}
+
+DateTime::DateTime( const css::util::DateTime& rDateTime )
+  : Date( rDateTime.Day, rDateTime.Month, rDateTime.Year ),
+    Time( rDateTime.Hours, rDateTime.Minutes, rDateTime.Seconds, rDateTime.NanoSeconds )
+{
+}
+
+DateTime& DateTime::operator =( const css::util::DateTime& rUDateTime )
+{
+    Date::operator=( Date( rUDateTime.Day, rUDateTime.Month, rUDateTime.Year));
+    Time::operator=( Time( rUDateTime));
+    return *this;
+}
+
+bool DateTime::IsBetween( const DateTime& rFrom, const DateTime& rTo ) const
+{
+    return (*this >= rFrom) && (*this <= rTo);
+}
+
+bool DateTime::operator >( const DateTime& rDateTime ) const
+{
+    return (Date::operator>( rDateTime )) ||
+         (Date::operator==( rDateTime ) && tools::Time::operator>( rDateTime ));
+}
+
+bool DateTime::operator <( const DateTime& rDateTime ) const
+{
+    return (Date::operator<( rDateTime )) ||
+         (Date::operator==( rDateTime ) && tools::Time::operator<( rDateTime ));
+}
+
+bool DateTime::operator >=( const DateTime& rDateTime ) const
+{
+    return (Date::operator>( rDateTime )) ||
+         (Date::operator==( rDateTime ) && tools::Time::operator>=( rDateTime ));
+}
+
+bool DateTime::operator <=( const DateTime& rDateTime ) const
+{
+    return (Date::operator<( rDateTime )) ||
+         (Date::operator==( rDateTime ) && tools::Time::operator<=( rDateTime ));
+}
+
+sal_Int64 DateTime::GetSecFromDateTime( const Date& rDate ) const
+{
+    if ( Date::operator<( rDate ) )
+        return 0;
+    else
+    {
+        sal_Int64 nSec = Date( *this ) - rDate;
+        nSec *= 24UL*60*60;
+        sal_Int64 nHour = GetHour();
+        sal_Int64 nMin  = GetMin();
+        nSec += (nHour*3600)+(nMin*60)+GetSec();
+        return nSec;
+    }
+}
+
+void DateTime::NormalizeTimeRemainderAndApply( tools::Time& rTime )
+{
+    sal_uInt16 nHours = rTime.GetHour();
+    if ( rTime.GetTime() > 0 )
+    {
+        if (nHours >= 24)
+        {
+            AddDays( nHours / 24 );
+            nHours %= 24;
+            rTime.SetHour( nHours );
+        }
+    }
+    else if ( rTime.GetTime() != 0 )
+    {
+        if (nHours >= 24)
+        {
+            AddDays( -static_cast<sal_Int32>(nHours) / 24 );
+            nHours %= 24;
+            rTime.SetHour( nHours );
+        }
+        Date::operator--();
+        rTime = Time( 24, 0, 0 ) + rTime;
+    }
+    tools::Time::operator=( rTime );
+}
+
+DateTime& DateTime::operator +=( const tools::Time& rTime )
+{
+    tools::Time aTime = *this;
+    aTime += rTime;
+    NormalizeTimeRemainderAndApply(aTime);
+    return *this;
+}
+
+DateTime& DateTime::operator -=( const tools::Time& rTime )
+{
+    tools::Time aTime = *this;
+    aTime -= rTime;
+    NormalizeTimeRemainderAndApply(aTime);
+    return *this;
+}
+
+DateTime& DateTime::operator +=( const tools::Duration& rDuration )
+{
+    AddDays(rDuration.GetDays());
+    operator+=(rDuration.GetTime());
+    return *this;
+}
+
+DateTime operator +( const DateTime& rDateTime, sal_Int32 nDays )
+{
+    DateTime aDateTime( rDateTime );
+    aDateTime.AddDays( nDays );
+    return aDateTime;
+}
+
+DateTime operator -( const DateTime& rDateTime, sal_Int32 nDays )
+{
+    DateTime aDateTime( rDateTime );
+    aDateTime.AddDays( -nDays );
+    return aDateTime;
+}
+
+DateTime operator +( const DateTime& rDateTime, const tools::Time& rTime )
+{
+    DateTime aDateTime( rDateTime );
+    aDateTime += rTime;
+    return aDateTime;
+}
+
+DateTime operator -( const DateTime& rDateTime, const tools::Time& rTime )
+{
+    DateTime aDateTime( rDateTime );
+    aDateTime -= rTime;
+    return aDateTime;
+}
+
+DateTime operator +( const DateTime& rDateTime, const tools::Duration& rDuration )
+{
+    DateTime aDateTime(rDateTime);
+    aDateTime.AddDays( rDuration.GetDays());
+    aDateTime += rDuration.GetTime();
+    return aDateTime;
+}
+
+void DateTime::AddTime( double fTimeInDays )
+{
+    // Use Duration to diminish floating point accuracy errors.
+    tools::Duration aDuration(fTimeInDays);
+    operator+=(aDuration);
+}
+
+DateTime operator +( const DateTime& rDateTime, double fTimeInDays )
+{
+    DateTime aDateTime( rDateTime );
+    aDateTime.AddTime( fTimeInDays );
+    return aDateTime;
+}
+
+tools::Duration operator -( const DateTime& rDateTime1, const DateTime& rDateTime2 )
+{
+    return tools::Duration( rDateTime2, rDateTime1);
+}
+
+// static
+double DateTime::Sub( const DateTime& rDateTime1, const DateTime& rDateTime2 )
+{
+    if (static_cast<const tools::Time&>(rDateTime1) != static_cast<const tools::Time&>(rDateTime2))
+    {
+        // Use Duration to diminish floating point accuracy errors.
+        const tools::Duration aDuration( rDateTime2, rDateTime1);
+        return aDuration.GetInDays();
+    }
+    return static_cast<const Date&>(rDateTime1) - static_cast<const Date&>(rDateTime2);
+}
+
+void DateTime::GetWin32FileDateTime( sal_uInt32 & rLower, sal_uInt32 & rUpper ) const
+{
+    const sal_Int64 a100nPerSecond = SAL_CONST_INT64( 10000000 );
+    const sal_Int64 a100nPerDay = a100nPerSecond * sal_Int64( 60 * 60 * 24 );
+
+    // FILETIME is indirectly documented as uint64, see
+    // https://msdn.microsoft.com/en-us/library/windows/desktop/ms724284.aspx
+    // mentioning the ULARGE_INTEGER structure.
+    // https://msdn.microsoft.com/en-us/library/windows/desktop/ms724280.aspx
+    // mentions that if FILETIME is not less than 0x8000000000000000 then the
+    // FileTimeToSystemTime function fails, which is another indicator.
+    // Unless there's evidence that FILETIME can represent a signed offset from
+    // 1601-01-01 truncate at 0. (reading part below in
+    // CreateFromWin32FileDateTime() would had to be adapted to signed as
+    // well).
+    sal_Int16 nYear = GetYear();
+    SAL_WARN_IF( nYear < 1601, "tools.datetime", "DateTime::GetWin32FileDateTime - year < 1601: " << nYear);
+
+    sal_Int64 aTime = (nYear < 1601 ? 0 : (
+        a100nPerDay * (*this - Date(1,1,1601)) +
+        GetNSFromTime()/100));
+
+    rLower = sal_uInt32( aTime % SAL_CONST_UINT64( 0x100000000 ) );
+    rUpper = sal_uInt32( aTime / SAL_CONST_UINT64( 0x100000000 ) );
+}
+
+DateTime DateTime::CreateFromWin32FileDateTime( sal_uInt32 rLower, sal_uInt32 rUpper )
+{
+    // (rUpper|rLower) = 100-nanosecond intervals since 1601-01-01 00:00
+    const sal_uInt64 a100nPerSecond = SAL_CONST_UINT64( 10000000 );
+    const sal_uInt64 a100nPerDay = a100nPerSecond * sal_uInt64( 60 * 60 * 24 );
+
+    sal_uInt64 aTime =
+            sal_uInt64( rUpper ) * SAL_CONST_UINT64( 0x100000000 ) +
+            sal_uInt64( rLower );
+
+    SAL_WARN_IF( static_cast<sal_Int64>(aTime) < 0, "tools.datetime",
+            "DateTime::CreateFromWin32FileDateTime - absurdly high value expected?");
+
+    sal_uInt64 nDays = aTime / a100nPerDay;
+
+    Date aDate(1,1,1601);
+    // (0xffffffffffffffff / a100nPerDay = 21350398) fits into sal_Int32
+    // (0x7fffffff = 2147483647)
+    aDate.AddDays(nDays);
+
+    SAL_WARN_IF( aDate - Date(1,1,1601) != static_cast<sal_Int32>(nDays), "tools.datetime",
+            "DateTime::CreateFromWin32FileDateTime - date truncated to max");
+
+    sal_uInt64 nNanos = (aTime - (nDays * a100nPerDay)) * 100;
+    return DateTime( aDate, tools::Time(
+                static_cast<sal_uInt32>((nNanos / tools::Time::nanoSecPerHour)   % sal_uInt64( 24 )),
+                static_cast<sal_uInt32>((nNanos / tools::Time::nanoSecPerMinute) % sal_uInt64( 60 )),
+                static_cast<sal_uInt32>((nNanos / tools::Time::nanoSecPerSec)    % sal_uInt64( 60 )),
+                static_cast<sal_uInt64>( nNanos % tools::Time::nanoSecPerSec)));
+}
+
+DateTime DateTime::CreateFromUnixTime(const double fSecondsSinceEpoch)
+{
+    double fValue = fSecondsSinceEpoch / Time::secondPerDay;
+    const sal_Int32 nDays = static_cast <sal_Int32>(::rtl::math::approxFloor(fValue));
+
+    Date aDate (1, 1, 1970);
+    aDate.AddDays(nDays);
+    SAL_WARN_IF(aDate - Date(1, 1, 1970) != nDays, "tools.datetime",
+                "DateTime::CreateFromUnixTime - date truncated to max");
+
+    fValue -= nDays;
+
+    const sal_uInt64 nNanos = fValue * tools::Time::nanoSecPerDay;
+    return DateTime( aDate, tools::Time(
+                static_cast<sal_uInt32>((nNanos / tools::Time::nanoSecPerHour)   % sal_uInt64( 24 )),
+                static_cast<sal_uInt32>((nNanos / tools::Time::nanoSecPerMinute) % sal_uInt64( 60 )),
+                static_cast<sal_uInt32>((nNanos / tools::Time::nanoSecPerSec)    % sal_uInt64( 60 )),
+                static_cast<sal_uInt64>( nNanos % tools::Time::nanoSecPerSec)));
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */