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mirror of https://git.dev.opencascade.org/repos/occt.git synced 2025-04-21 10:13:43 +03:00
occt/src/StepData/StepData_UndefinedEntity.cxx
msv ef59b5e064 0031292: Data Exchange - SIGSEGV on reading STEP file with references to invalid entities
Changes:

- in StepData_StepReaderData::ReadEntity, make sure that entity handle is not null before calling IsKind() of it.

- in StepData_StepReaderData::SetEntityNumbers, do not invert the sign of entity number of referenced parameter if the second pass is not required. Otherwise, the number -1 (obviously invalid) becomes 1 (invalid, but not obviously) without further correction of it.

- in StepData_UndefinedEntity::ReadRecord, consider the case when the entity number is positive but refers to non-existing entity. In this case literal value will be used instead of null entity for the problematic parameter.
2020-01-13 16:16:48 +03:00

167 lines
5.8 KiB
C++

// Copyright (c) 1999-2014 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 <Interface_Check.hxx>
#include <Interface_CopyTool.hxx>
#include <Interface_EntityIterator.hxx>
#include <Interface_Macros.hxx>
#include <Interface_ParamType.hxx>
#include <Interface_UndefinedContent.hxx>
#include <Standard_Type.hxx>
#include <StepData_StepReaderData.hxx>
#include <StepData_StepWriter.hxx>
#include <StepData_UndefinedEntity.hxx>
#include <TCollection_AsciiString.hxx>
#include <TCollection_HAsciiString.hxx>
IMPLEMENT_STANDARD_RTTIEXT(StepData_UndefinedEntity,Standard_Transient)
StepData_UndefinedEntity::StepData_UndefinedEntity ()
{ thecont = new Interface_UndefinedContent; thesub = Standard_False; }
StepData_UndefinedEntity::StepData_UndefinedEntity
(const Standard_Boolean issub)
{ thesub = issub; thecont = new Interface_UndefinedContent; }
Handle(Interface_UndefinedContent)
StepData_UndefinedEntity::UndefinedContent () const
{ return thecont; }
Standard_Boolean StepData_UndefinedEntity::IsSub () const
{ return thesub; }
Standard_Boolean StepData_UndefinedEntity::IsComplex () const
{ return (!thenext.IsNull()); }
Handle(StepData_UndefinedEntity) StepData_UndefinedEntity::Next () const
{ return thenext; }
Standard_CString StepData_UndefinedEntity::StepType () const
{ if (thetype.IsNull()) return ""; return thetype->ToCString(); }
void StepData_UndefinedEntity::ReadRecord(const Handle(StepData_StepReaderData)& SR,
const Standard_Integer num,
Handle(Interface_Check)& ach)
{
thetype = new TCollection_HAsciiString(SR->RecordType(num));
Standard_Integer nb = SR->NbParams(num);
thecont->Reservate (nb,4);
for (Standard_Integer i = 1; i <= nb; i ++) {
Handle(Standard_Transient) anent;
Handle(TCollection_HAsciiString) hval;
Standard_CString val = SR->ParamCValue(num,i);
Interface_ParamType partyp = SR->ParamType(num,i);
Standard_Integer nume = 0;
if (partyp == Interface_ParamIdent) {
nume = SR->ParamNumber(num,i);
if (nume > 0) {
anent = SR->BoundEntity(nume);
if (anent.IsNull()) {
nume = 0;
}
}
if (nume <= 0) {
ach->AddFail("A reference to another entity is unresolved");
partyp = Interface_ParamVoid;
}
}
else if (partyp == Interface_ParamSub) {
nume = SR->ParamNumber(num,i);
Handle(StepData_UndefinedEntity) und = new StepData_UndefinedEntity (Standard_True);
anent = und;
und->ReadRecord(SR,nume,ach);
}
else if (partyp == Interface_ParamText) {
// Return integre a supprimer silya
Standard_Integer lval = (Standard_Integer)strlen(val); Standard_Integer mval = -1;
for (Standard_Integer j = 0; j < lval; j ++) {
if (val[j] == '\n') { mval = i; break; }
}
if (mval > 0) {
nume = -1;
hval = new TCollection_HAsciiString (val);
hval->RemoveAll('\n');
}
}
if (nume == 0) hval = new TCollection_HAsciiString (val);
if (nume > 0) thecont->AddEntity(partyp,anent);
else thecont->AddLiteral (partyp,hval);
}
Standard_Integer nextyp = SR->NextForComplex(num);
if (nextyp == 0) return;
thenext = new StepData_UndefinedEntity;
thenext->ReadRecord(SR,nextyp,ach);
}
void StepData_UndefinedEntity::WriteParams (StepData_StepWriter& SW) const
{
if (!IsSub()) SW.StartEntity(TCollection_AsciiString(StepType()));
Standard_Integer nb = thecont->NbParams();
Handle(Standard_Transient) anent;
for (Standard_Integer i = 1; i <= nb; i ++) {
Interface_ParamType partyp = thecont->ParamType(i);
if (partyp == Interface_ParamSub) {
DeclareAndCast(StepData_UndefinedEntity,und,thecont->ParamEntity(i));
und->StepType(); //svv #2
if (und->IsSub()) SW.OpenTypedSub (und->StepType());
und->WriteParams(SW);
if (und->IsSub()) SW.CloseSub();
}
else if (partyp == Interface_ParamIdent) {
anent = thecont->ParamEntity(i);
SW.Send(anent);
}
else SW.SendString (thecont->ParamValue(i)->ToCString());
}
// if (IsSub()) return;
// SW.NewLine(Standard_True);
if (thenext.IsNull()) return;
thenext->WriteParams(SW);
}
void StepData_UndefinedEntity::GetFromAnother
(const Handle(StepData_UndefinedEntity)& another,
Interface_CopyTool& TC)
{
// DeclareAndCast(StepData_UndefinedEntity,another,other);
thetype = new TCollection_HAsciiString (another->StepType());
thecont = new Interface_UndefinedContent;
thecont->GetFromAnother(another->UndefinedContent(),TC);
thesub = another->IsSub();
if (another->IsComplex()) thenext =
GetCasted(StepData_UndefinedEntity,TC.Transferred(another->Next()));
else thenext.Nullify();
}
void StepData_UndefinedEntity::FillShared
(Interface_EntityIterator& list) const
{
Standard_Integer i, nb = thecont->NbParams();
for (i = 1; i <= nb; i ++) {
Interface_ParamType ptype = thecont->ParamType(i);
if (ptype == Interface_ParamSub) {
DeclareAndCast(StepData_UndefinedEntity,subent,thecont->ParamEntity(i));
subent->FillShared (list);
} else if (ptype == Interface_ParamIdent) {
list.AddItem(thecont->ParamEntity(i));
}
}
if (!thenext.IsNull()) thenext->FillShared (list);
}