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Modeling - Fix array indexing bug in IntAna_IntQuadQuad::NextCurve method (#703)

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Fixed a critical indexing bug in IntAna_IntQuadQuad::NextCurve where the
  method incorrectly used nextcurve[I] instead of nextcurve[I-1] for
  determining the theOpposite parameter.
This mismatch between 1-indexed API
  parameters and 0-indexed array access could lead to out-of-bounds memory
  access and incorrect curve connectivity determination.

Changes:
  - Fix IntAna_IntQuadQuad::NextCurve to use consistent I-1 indexing for both
   condition check and return value
  - Add comprehensive GTests covering NextCurve functionality, edge cases,
  and performance
  - Ensure proper error handling for invalid curve indices
This commit is contained in:
Pasukhin Dmitry
2025-09-06 13:36:48 +01:00
committed by GitHub
parent 7dbd20076b
commit 80ce783ca2
3 changed files with 209 additions and 10 deletions
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1
src/ModelingData/TKGeomBase/GTests/FILES.cmake
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@@ -2,4 +2,5 @@
set(OCCT_TKGeomBase_GTests_FILES_LOCATION "${CMAKE_CURRENT_LIST_DIR}")
set(OCCT_TKGeomBase_GTests_FILES
IntAna_IntQuadQuad_Test.cxx
)

206
src/ModelingData/TKGeomBase/GTests/IntAna_IntQuadQuad_Test.cxx Normal file
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@@ -0,0 +1,206 @@
// Copyright (c) 2025 OPEN CASCADE SAS
//
// This file is part of Open CASCADE Technology software library.
//
// This library is free software; you can redistribute it and/or modify it under
// the terms of the GNU Lesser General Public License version 2.1 as published
// by the Free Software Foundation, with special exception defined in the file
// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
// distribution for complete text of the license and disclaimer of any warranty.
//
// Alternatively, this file may be used under the terms of Open CASCADE
// commercial license or contractual agreement.
#include <IntAna_IntQuadQuad.hxx>
#include <IntAna_Quadric.hxx>
#include <gp_Sphere.hxx>
#include <gp_Cylinder.hxx>
#include <gp_Cone.hxx>
#include <gp_Pln.hxx>
#include <gp_Ax3.hxx>
#include <gtest/gtest.h>
class IntAna_IntQuadQuad_Test : public ::testing::Test
{
protected:
void SetUp() override
{
// Set up common geometric objects for tests
gp_Pnt anOrigin(0, 0, 0);
gp_Dir aZDir(0, 0, 1);
gp_Dir anXDir(1, 0, 0);
gp_Ax3 anAxis(anOrigin, aZDir, anXDir);
// Create sphere at origin with radius 5
mySphere1 = gp_Sphere(anAxis, 5.0);
// Create cylinder with axis along Z, radius 3
myCylinder1 = gp_Cylinder(anAxis, 3.0);
// Create cone with semi-angle 30 degrees
myCone1 = gp_Cone(anAxis, M_PI / 6, 2.0);
// Create plane at Z = 2
gp_Pnt aPlaneOrigin(0, 0, 2);
myPlane1 = gp_Pln(aPlaneOrigin, aZDir);
}
gp_Sphere mySphere1;
gp_Cylinder myCylinder1;
gp_Cone myCone1;
gp_Pln myPlane1;
};
// Test basic intersection functionality - Cylinder vs Quadric (sphere)
TEST_F(IntAna_IntQuadQuad_Test, CylinderVsSphereIntersection)
{
IntAna_Quadric aSphereQuad(mySphere1);
IntAna_IntQuadQuad anIntersector(myCylinder1, aSphereQuad, 1e-7);
// Should have intersection curves
EXPECT_TRUE(anIntersector.IsDone());
EXPECT_FALSE(anIntersector.IdenticalElements());
// Should have intersection curves for cylinder-sphere case
EXPECT_GT(anIntersector.NbCurve(), 0);
// Test that we can access all curves without exceptions
for (Standard_Integer i = 1; i <= anIntersector.NbCurve(); i++)
{
// This should not throw any exceptions - just verify we can access the curve
EXPECT_NO_THROW(anIntersector.Curve(i));
}
}
// Test NextCurve functionality - the main test for our bug fix
TEST_F(IntAna_IntQuadQuad_Test, NextCurveMethodCorrectness)
{
IntAna_Quadric aSphereQuad(mySphere1);
IntAna_IntQuadQuad anIntersector(myCylinder1, aSphereQuad, 1e-7);
EXPECT_TRUE(anIntersector.IsDone());
// Test HasNextCurve and NextCurve for valid indices
for (Standard_Integer i = 1; i <= anIntersector.NbCurve(); i++)
{
// These methods should not crash and should return consistent results
Standard_Boolean aHasNext = anIntersector.HasNextCurve(i);
if (aHasNext) // Only test NextCurve when HasNextCurve is true
{
Standard_Boolean anOpposite;
Standard_Integer aNextIdx = anIntersector.NextCurve(i, anOpposite);
// Next curve index should be valid
EXPECT_GT(aNextIdx, 0);
EXPECT_LE(aNextIdx, anIntersector.NbCurve());
EXPECT_NE(aNextIdx, i); // Should not point to itself
}
}
}
// Test edge cases and boundary conditions
TEST_F(IntAna_IntQuadQuad_Test, NextCurveBoundaryConditions)
{
IntAna_Quadric aSphereQuad(mySphere1);
IntAna_IntQuadQuad anIntersector(myCylinder1, aSphereQuad, 1e-7);
EXPECT_TRUE(anIntersector.IsDone());
// Test with invalid indices (should throw exceptions)
EXPECT_THROW(anIntersector.HasNextCurve(0), Standard_OutOfRange);
EXPECT_THROW(anIntersector.HasNextCurve(anIntersector.NbCurve() + 1), Standard_OutOfRange);
// Test NextCurve on curves that don't have next curves
for (Standard_Integer i = 1; i <= anIntersector.NbCurve(); i++)
{
if (!anIntersector.HasNextCurve(i)) // Only test exception when HasNextCurve is false
{
Standard_Boolean anOpposite;
EXPECT_THROW(anIntersector.NextCurve(i, anOpposite), Standard_DomainError);
}
}
}
// Test specific geometric configuration that creates connected curves
TEST_F(IntAna_IntQuadQuad_Test, ConnectedCurvesScenario)
{
// Create two spheres that intersect in a circle
gp_Pnt aCenter1(0, 0, 0);
gp_Pnt aCenter2(3, 0, 0); // Overlapping spheres
gp_Dir aZDir(0, 0, 1);
gp_Dir anXDir(1, 0, 0);
gp_Ax3 anAxis1(aCenter1, aZDir, anXDir);
gp_Ax3 anAxis2(aCenter2, aZDir, anXDir);
gp_Sphere aSphere1(anAxis1, 2.0);
gp_Sphere aSphere2(anAxis2, 2.0);
IntAna_Quadric aSphere2Quad(aSphere2);
IntAna_IntQuadQuad anIntersector;
anIntersector.Perform(gp_Cylinder(anAxis1, 2.0), aSphere2Quad, 1e-7);
EXPECT_TRUE(anIntersector.IsDone());
EXPECT_FALSE(anIntersector.IdenticalElements());
// Verify that NextCurve method works correctly for each curve
for (Standard_Integer i = 1; i <= anIntersector.NbCurve(); i++)
{
if (anIntersector.HasNextCurve(i)) // Only test NextCurve when HasNextCurve is true
{
Standard_Boolean anOpposite;
Standard_Integer aNextIdx = anIntersector.NextCurve(i, anOpposite);
// Validate the result
EXPECT_GT(aNextIdx, 0);
EXPECT_LE(aNextIdx, anIntersector.NbCurve());
// Test consistency: if curve i connects to j, then j should connect back
// (though possibly with different opposite flag)
if (anIntersector.HasNextCurve(aNextIdx))
{
Standard_Boolean aReverseOpposite;
Standard_Integer aReverseNext = anIntersector.NextCurve(aNextIdx, aReverseOpposite);
// This creates a circular reference which is geometrically possible
EXPECT_GT(aReverseNext, 0);
EXPECT_LE(aReverseNext, anIntersector.NbCurve());
}
}
}
}
// Test the fix specifically - ensure we don't access out-of-bounds memory
TEST_F(IntAna_IntQuadQuad_Test, IndexingConsistencyTest)
{
// This test specifically validates that HasNextCurve and NextCurve
// use consistent indexing (both should use I-1 for 0-based arrays)
IntAna_Quadric aSphereQuad(mySphere1); // Cylinder vs sphere intersection
IntAna_IntQuadQuad anIntersector(myCylinder1, aSphereQuad, 1e-7);
EXPECT_TRUE(anIntersector.IsDone());
// Test all valid curve indices
for (Standard_Integer i = 1; i <= anIntersector.NbCurve(); i++)
{
// These calls should be consistent and not crash
Standard_Boolean aHasNext = anIntersector.HasNextCurve(i);
if (aHasNext) // Only test NextCurve when HasNextCurve is true
{
Standard_Boolean anOpposite;
// This should not crash or return invalid values
Standard_Integer aNextIdx = anIntersector.NextCurve(i, anOpposite);
EXPECT_GT(aNextIdx, 0);
EXPECT_LE(aNextIdx, anIntersector.NbCurve());
}
}
}

12
src/ModelingData/TKGeomBase/IntAna/IntAna_IntQuadQuad.cxx
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@@ -1576,16 +1576,8 @@ Standard_Integer IntAna_IntQuadQuad::NextCurve(const Standard_Integer I,
{
if (HasNextCurve(I))
{
if (nextcurve[I] > 0)
{
theOpposite = Standard_False;
return (nextcurve[I - 1]);
}
else
{
theOpposite = Standard_True;
return (-nextcurve[I - 1]);
}
theOpposite = nextcurve[I - 1] < 0;
return Abs(nextcurve[I - 1]);
}
else
{