coverity#1250406 Division or modulo by float zero

and

coverity#1250407 Division or modulo by float zero
coverity#1250408 Division or modulo by float zero

Change-Id: I77e4483356f7c0b287a29637cf6b958ee665ffec

svtools/source/brwbox/brwbox1.cxx

@@ -19,6 +19,7 @@
 
 #include <svtools/brwbox.hxx>
 #include <svtools/brwhead.hxx>
+#include <o3tl/numeric.hxx>
 #include "datwin.hxx"
 #include <tools/debug.hxx>
 #include <tools/stream.hxx>
@@ -2418,7 +2419,6 @@ long BrowseBox::GetTitleHeight() const
     return nTitleLines ? nTitleLines * nHeight + 4 : 0;
 }
 
-
 long BrowseBox::CalcReverseZoom(long nVal)
 {
     if (IsZoom())
@@ -2426,6 +2426,8 @@ long BrowseBox::CalcReverseZoom(long nVal)
         const Fraction& rZoom = GetZoom();
         double n = (double)nVal;
         n *= (double)rZoom.GetDenominator();
+        if (!rZoom.GetNumerator())
+            throw o3tl::divide_by_zero();
         n /= (double)rZoom.GetNumerator();
         nVal = n>0 ? (long)(n + 0.5) : -(long)(-n + 0.5);
     }
@@ -2445,8 +2447,6 @@ void BrowseBox::CursorMoved()
         );
 }
 
-
-
 void BrowseBox::LoseFocus()
 {
     OSL_TRACE( "BrowseBox: %p->LoseFocus", this );

svtools/source/brwbox/datwin.cxx

@@ -19,9 +19,8 @@
 
 
 #include "datwin.hxx"
-
+#include <o3tl/numeric.hxx>
 #include <vcl/svapp.hxx>
-
 #include <vcl/help.hxx>
 #include <vcl/image.hxx>
 #include <vcl/settings.hxx>
@@ -101,8 +100,6 @@ void ButtonFrame::Draw( OutputDevice& rDev )
     rDev.SetFillColor( aOldFillColor );
 }
 
-
-
 BrowserColumn::BrowserColumn( sal_uInt16 nItemId, const class Image &rImage,
                               const OUString& rTitle, sal_uLong nWidthPixel, const Fraction& rCurrentZoom )
 :   _nId( nItemId ),
@@ -114,6 +111,8 @@ BrowserColumn::BrowserColumn( sal_uInt16 nItemId, const class Image &rImage,
     double n = (double)_nWidth;
     n *= (double)rCurrentZoom.GetDenominator();
     n /= (double)rCurrentZoom.GetNumerator();
+    if (!rCurrentZoom.GetNumerator())
+        throw o3tl::divide_by_zero();
     _nOriginalWidth = n>0 ? (long)(n+0.5) : -(long)(-n+0.5);
 }
 
@@ -121,19 +120,17 @@ BrowserColumn::~BrowserColumn()
 {
 }
 
-
-
 void BrowserColumn::SetWidth(sal_uLong nNewWidthPixel, const Fraction& rCurrentZoom)
 {
     _nWidth = nNewWidthPixel;
     double n = (double)_nWidth;
     n *= (double)rCurrentZoom.GetDenominator();
+    if (!rCurrentZoom.GetNumerator())
+        throw o3tl::divide_by_zero();
     n /= (double)rCurrentZoom.GetNumerator();
     _nOriginalWidth = n>0 ? (long)(n+0.5) : -(long)(-n+0.5);
 }
 
-
-
 void BrowserColumn::Draw( BrowseBox& rBox, OutputDevice& rDev, const Point& rPos, bool bCurs  )
 {
     if ( _nId == 0 )