ole32: Accept STG_E_UNIMPLEMENTEDFUNCTION when ILockBytes implementation doesn't support locking.

[Dmitry Timoshkov]

Nikolay Sivov <bunglehead at gmail.com> wrote:

> >       /* If the ILockBytes doesn't support locking that's ok. */
> > -    if (hr == STG_E_INVALIDFUNCTION) return S_OK;
> > +    if (hr == STG_E_INVALIDFUNCTION || hr == STG_E_UNIMPLEMENTEDFUNCTION) return S_OK;
> >       else if (FAILED(hr)) return hr;
> >
> >       hr = S_OK;
> >
> 
> It looks like StorageImpl_LockRegionSync should be fixed instead to 
> filter some error codes. Could you add a test with external ILockBytes 
> implementation that does that?

Thers is no any comment or a test case about accepting ILockByte failures
neither in the original commit 65887802c502c4eeeb3fc905990e3e2f4548a482,
nor in the next one 1645f7b9e30e01bc92a8bfd1febe76d4856e046e which limits
accepted error codes to STG_E_INVALIDFUNCTION.

Besides, my patch fixes a regression caused by IStorage locking rewrite,
and should be pretty obvious without a test case. With this regression
fixed an application that I have here can open its database files again
as it was before.

If you really insist on a test case, please ask Vincent, he is the original
authour of this implementation.

-- 
Dmitry.