On Oct 20, 2009, at 11:00 AM, David Aggeler wrote:

> Is a dissector supposed to be able to handle something like this, i.e.
> being called with tree specified somewhere in the middle of the  
> stream?

Yes.  A dissector is expected to be able to handle being called with  
tree null or non-null at any point; it's up to the Wireshark/TShark/ 
etc. core to choose whether it needs, and hence asks for, a protocol  
tree or not.
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