winmm/tests: waveOutGetDevCaps called with invalid size

Robert Reif reif at
Wed Apr 23 05:38:21 CDT 2008

>> There are only two options:
>> only pass the number of bytes requested or return an error for unreasonable
>> sizes.  What is Terminal Server doing?  
> It's returning an error. 
And what is the error?  If you know the error code returned, Ill add it 
to the code so
we can end this discussion.
>> waveOutGetDevCapsW lets the driver do the copy (just like old versions of
>> windows).  The driver should be checking the size and only copying that much.
>> If it doesn't, then it broken.
> Any references for this claim?
Read the code.
> You are saying that the driver "should only copy that much", but *what* 
> should it copy? In other words: If the size doesn't match the size of any 
> should the driver then just *assume* some structure? Which one? As far as 
> I know, there's no guarantee that, for example, the first 
> sizeof(WAVEOUTCAPSW) bytes of WAVEOUTCAPSW are the same as WAVEOUTCAPS2W. 
Again, read the code. WAVEOUTCAPS2 is a superset of WAVEOUTCAPS
so it doesn't matter when the length is shorter than WAVEOUTCAPS.  The
drivers only support W so mixing A and W is not an issue.

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