Parsing variable length protocol trailer

["Edgar, Thomas" <thomas.edgar () pnl gov>]

I have a variable length protocol trailer (which is only known by the end devices) to parse and there is no way to 
figure it out during the framing process.  Is there a way to determine how many bytes the subdissectors actually used 
or how many bytes are left unused after a return from dissector_try_port/heuristic?  Is there something in the tvbuff, 
packet_info, or proto_tree structures that would work?

Thanks,

Thomas W. Edgar

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