Make tools::Time ctor taking sal_Int64 private

This ctor is meant to set the value of nTime directly; and that value
is not nanoseconds, but an encoded value, using SEC_/MIN_/HOUR_MASK.
But in some places, this ctor was misused for setting of nanoseconds,
which would only accidentally work for values less than one second.
All places that initialized tools::Time with 0, now use EMPTY.

This makes the ctor private; and for the very few cases where really
the encoded value of nTime is stored / restored, fromEncodedTime is
introduced.

Change-Id: I1f1994bd9aab1b51a41b1de637619049fe820da4
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/175283
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>

3 files changed, 6 insertions, 3 deletions

diff --git a/include/tools/datetime.hxx b/include/tools/datetime.hxx
index f50db1049a77..29dbc80d2ed1 100644
--- a/include/tools/datetime.hxx
+++ b/include/tools/datetime.hxx
@@ -48,7 +48,7 @@ public:
                     explicit DateTime( DateTimeInitSystem );
                     DateTime( const DateTime& rDateTime ) :
                         Date( rDateTime ), Time( rDateTime ) {}
-                    explicit DateTime( const Date& rDate ) : Date( rDate ), Time(0) {}
+                    explicit DateTime( const Date& rDate ) : Date( rDate ), Time(Time::EMPTY) {}
                     explicit DateTime( const tools::Time& rTime ) : Date(0), Time( rTime ) {}
                     DateTime( const Date& rDate, const tools::Time& rTime ) :
                         Date( rDate ), Time( rTime ) {}
diff --git a/include/tools/duration.hxx b/include/tools/duration.hxx
index 9f032539e142..ca0d7088b7e1 100644
--- a/include/tools/duration.hxx
+++ b/include/tools/duration.hxx
@@ -96,7 +96,7 @@ private:
     void SetTimeDiff(const Time& rStart, const Time& rEnd);
 
 private:
-    Time maTime = Time(0);
+    Time maTime = Time(Time::EMPTY);
     sal_Int32 mnDays = 0;
 };
 }
diff --git a/include/tools/time.hxx b/include/tools/time.hxx
index c92bdd9aee05..9b3d15f5ec22 100644
--- a/include/tools/time.hxx
+++ b/include/tools/time.hxx
@@ -40,6 +40,7 @@ class SAL_WARN_UNUSED TOOLS_DLLPUBLIC Time
 {
 private:
     sal_Int64       nTime;
+    explicit Time(sal_Int64 _nTime) { nTime = _nTime; }
     static sal_Int64 assemble(sal_uInt32 h, sal_uInt32 m, sal_uInt32 s, sal_uInt64 ns);
     short GetSign() const { return (nTime >= 0) ? +1 : -1; }
 
@@ -78,13 +79,15 @@ public:
                     explicit Time( TimeInitEmpty )
                         { nTime = 0; }
                     explicit Time( TimeInitSystem );
-                    explicit Time( sal_Int64 _nTime ) { Time::nTime = _nTime; }
                     Time( const tools::Time& rTime ) = default;
                     explicit Time( const css::util::Time& rTime );
                     explicit Time( const css::util::DateTime& rDateTime );
                     Time( sal_uInt32 nHour, sal_uInt32 nMin,
                           sal_uInt32 nSec = 0, sal_uInt64 nNanoSec = 0 );
 
+    // The argument is not nanoseconds, it's what nTime must contain!
+    static Time fromEncodedTime(sal_Int64 _nTime) { return Time(_nTime); }
+
     void            SetTime( sal_Int64 nNewTime ) { nTime = nNewTime; }
     sal_Int64       GetTime() const { return nTime; }
     css::util::Time GetUNOTime() const { return css::util::Time(GetNanoSec(),GetSec(),GetMin(),GetHour(),false); }