0029478: Crash because bSplineSurfaceWithKnots is NULL

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Date Submitted

Last Update

0029478

Community

[OCCT] OCCT:Data Exchange

public

2018-02-03 04:08

Reporter

stefan

Assigned To

gka

Priority

normal

Severity

crash

Status

new

Resolution

open

Platform

Visual Studio 2017 32 bit

Windows

OS Version

Product Version

[OCCT] 7.1.0

Target Version

Fixed in Version

Summary

0029478: Crash because bSplineSurfaceWithKnots is NULL

Description

I created a simplified STP file(see attachment) using WorkXplore 2018.1.0 x64.

The crash happens here:

BS = BSR->BSplineSurfaceWithKnots(); // returns NULL
...
const Standard_Integer UDeg = BS->UDegree(); // crashes here

Here is the full code:

Handle(Geom_BSplineSurface) StepToGeom::MakeBSplineSurface (const Handle(StepGeom_BSplineSurface)& SS)
{
  Standard_Integer i, j;
  Handle(StepGeom_BSplineSurfaceWithKnots) BS;
  Handle(StepGeom_BSplineSurfaceWithKnotsAndRationalBSplineSurface) BSR;

  if (SS->
      IsKind(STANDARD_TYPE(StepGeom_BSplineSurfaceWithKnotsAndRationalBSplineSurface))) {
    BSR =
      Handle(StepGeom_BSplineSurfaceWithKnotsAndRationalBSplineSurface)
    ::DownCast(SS);
    BS = BSR->BSplineSurfaceWithKnots();
  }
  else
    BS = Handle(StepGeom_BSplineSurfaceWithKnots)::DownCast(SS);

  const Standard_Integer UDeg = BS->UDegree();
...

Steps To Reproduce

This is how I'm using the Step Reader. The software crashes in TransferRoots() everytime.

// Remove std::cout from the printer list of OpenCASCADE
// More precisely, remove ALL printers from the list.
Message::DefaultMessenger()->ChangePrinters().Clear();

// Install our own error printer
std::string error_message;
Message::DefaultMessenger()->AddPrinter(Handle_Message_Printer(new STEPErrorPrinter(&error_message, STEPErrorLevel::FAILURE)));

auto reader = STEPControl_Reader();
reader.ReadFile(d_filename.c_str());
reader.TransferRoots();

Issue History
Date Modified	Username	Field	Change
2018-02-03 04:08	stefan	New Issue
2018-02-03 04:08	stefan	Assigned To	=> gka
2018-02-03 04:08	stefan	File Added: Toy Test 6 d_ok rough_no_groups.stp

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