[SMB2] buffer handling

[Stefan (metze) Metzmacher]

tridge at samba.org schrieb:
> Metze,
> 
>  > This allows us to distinguish between a NULL buffer and a zero length
>  > buffer. And it also handle padding of the buffers.
> 
> Following up to our discussion on IRC, what do you think about this
> approach?
> 
> Note in particulat the smb2_oob() change. We need that as we need to
> allow offsets pointing outside the packet, as long as the length is
> zero bytes.

That would at least work, I think it's much clearer to pass
DATA_BLOB *blob as NULL as looking at blob.data.

Maybe just commit this and we can may change it later to pass *blob...

metze

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