Patch - no parameters validation, overly complex code

Hey.

Attached is an untested patch that addresses the following issues:
- pointers that are later dereferenced are not checked for being valid
- "out" parameters are not set on control paths that return S_FALSE or S_OK
- "class" with all public members is used instead of "struct"
- overly complex code

Also there's a "switch(m_State)" that has no "default:" branch - what should happen there semantically? Should execution continue or should the code signal an error?

Best wishes.
Dmitry.

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