0025568: SIGSEGV in thrusections with edge without 3D curve

-Set algorithm flag NotDone if there is a non-degenerated edge with absent 3D curve.
-Check IsDone flag in thrusection command.
-Add test case bugs/modalg_5/bug25568.

Small correction of test case for issue CR25568

src/BRepFill/BRepFill_Generator.cxx

@@ -61,7 +61,7 @@
 
 #include <BRepTools_WireExplorer.hxx>
 #include <BRepTools.hxx>
-
+#include <Standard_NullObject.hxx>
 
 
 //=======================================================================
@@ -96,6 +96,8 @@ Standard_Integer DetectKPart(const TopoDS_Edge& Edge1,
   }
   else {
     curv1 = BRep_Tool::Curve(Edge1, loc, first1, last1);
+    if (curv1.IsNull())
+      Standard_NullObject::Raise("Null 3D curve in edge");
     curv1 = 
       Handle(Geom_Curve)::DownCast(curv1->Transformed(loc.Transformation()));
     ff = first1;
@@ -161,6 +163,8 @@ Standard_Integer DetectKPart(const TopoDS_Edge& Edge1,
     }
     else {
       curv = BRep_Tool::Curve(Edge2, loc, first2, last2);
+      if (curv.IsNull())
+        Standard_NullObject::Raise("Null 3D curve in edge");
       curv = 
 	Handle(Geom_Curve)::DownCast(curv->Transformed(loc.Transformation()));
       ff = first2;
@@ -339,6 +343,8 @@ void CreateKPart(const TopoDS_Edge& Edge1,const TopoDS_Edge& Edge2,
   }
   else {
     C1 = BRep_Tool::Curve(Edge1, loc, a1, b1);
+    if (C1.IsNull())
+      Standard_NullObject::Raise("Null 3D curve in edge");
     C1 = Handle(Geom_Curve)::DownCast(C1->Transformed(loc.Transformation()));
     aa = a1;
     bb = b1;
@@ -362,6 +368,8 @@ void CreateKPart(const TopoDS_Edge& Edge1,const TopoDS_Edge& Edge2,
   }
   else {
     C2 = BRep_Tool::Curve(Edge2, loc, a1, b1);
+    if (C2.IsNull())
+      Standard_NullObject::Raise("Null 3D curve in edge");
     C2 = Handle(Geom_Curve)::DownCast(C2->Transformed(loc.Transformation()));
     if (Edge2.Orientation() == TopAbs_REVERSED) {
       C2->Reverse();
@@ -663,6 +671,8 @@ void BRepFill_Generator::Perform()
 	}
 	else {
 	  C1 = BRep_Tool::Curve(Edge1,L1,f1,l1);
+          if (C1.IsNull())
+            Standard_NullObject::Raise("Null 3D curve in edge");
 	}
 	if (degen2) {
 	  Extremities(1) = BRep_Tool::Pnt(V2l);
@@ -671,6 +681,8 @@ void BRepFill_Generator::Perform()
 	}
 	else {
 	  C2 = BRep_Tool::Curve(Edge2,L2,f2,l2);
+          if (C2.IsNull())
+            Standard_NullObject::Raise("Null 3D curve in edge");
 	}
 	
 	// compute the location

src/BRepOffsetAPI/BRepOffsetAPI_ThruSections.cxx

@@ -96,6 +96,7 @@
 
 #include <BRepBuilderAPI_MakeFace.hxx>
 #include <BRepBuilderAPI_FindPlane.hxx>
+#include <Standard_NullObject.hxx>
 
 
 //=======================================================================
@@ -391,18 +392,24 @@ void BRepOffsetAPI_ThruSections::Build()
     myWires = WorkingSections;
   }
 
-  // Calculate the resulting shape
-  if (myWires.Length() == 2 || myIsRuled) {
-    // create a ruled shell
-    CreateRuled();
+  try {
+    // Calculate the resulting shape
+    if (myWires.Length() == 2 || myIsRuled) {
+      // create a ruled shell
+      CreateRuled();
+    }
+    else {
+      // create a smoothed shell
+      CreateSmoothed();
+    }
   }
-  else {
-    // create a smoothed shell
-    CreateSmoothed();
+  catch (Standard_Failure)
+  {
+    NotDone();
+    return;
   }
   // Encode the Regularities
   BRepLib::EncodeRegularity(myShape);
-
 }
 
 
@@ -882,6 +889,8 @@ static Handle(Geom_BSplineCurve) EdgeToBSpline (const TopoDS_Edge& theEdge)
     TopLoc_Location aLoc;
     Standard_Real aFirst, aLast;
     Handle(Geom_Curve) aCurve = BRep_Tool::Curve (theEdge, aLoc, aFirst, aLast);
+    if (aCurve.IsNull())
+      Standard_NullObject::Raise("Null 3D curve in edge");
 
     // convert its part used by edge to bspline; note that if edge curve is bspline,
     // conversion made via trimmed curve is still needed -- it will copy it, segment 

src/BRepTest/BRepTest_SweepCommands.cxx

@@ -408,10 +408,13 @@ Standard_Integer thrusections(Draw_Interpretor&, Standard_Integer n, const char*
 
   Generator.Build();
 
-  TopoDS_Shape Shell = Generator.Shape();
-  
-  DBRep::Set(a[index-1], Shell);
-
+  if (Generator.IsDone()) {
+    TopoDS_Shape Shell = Generator.Shape();
+    DBRep::Set(a[index-1], Shell);
+  }
+  else {
+    cout << "Algorithm is not done" << endl;
+  }
   return 0;
 }
 

tests/bugs/modalg_5/bug25568

@@ -0,0 +1,26 @@
+puts "============"
+puts "OCC25568"
+puts "============"
+puts ""
+#########################################################################
+# SIGSEGV in thrusections with edge without 3D curve
+#########################################################################
+
+restore [locate_data_file bug25568_loft-inv1-draw-Loft-00-section.brep] Loft-00-section
+restore [locate_data_file bug25568_loft-inv1-draw-Loft-01-section.brep] Loft-01-section
+
+if [info exists result] {unset result}
+
+thrusections result 0 0 Loft-00-section Loft-01-section
+
+if ![isdraw result] {
+  if {[info commands fixshape] == ""} {pload XSDRAW}
+  fixshape Loft-00-section_fixed Loft-00-section
+  thrusections result 0 0 Loft-00-section_fixed Loft-01-section
+  if ![isdraw result] {
+    puts "Error : thrusection is failed even after fixing arguments"
+  }
+}
+
+set square 25.236
+set 2dviewer 0