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

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