Wireshark · Wireshark-dev: Re: [Wireshark-dev] How to get absolute frame/packet index in buffer?

[Guy Harris <guy@xxxxxxxxxxxx>]

Sebastien Dubois wrote:

>   I'm currently developping a plugin and I have a little question:  Is 
> it possible, from a given dissector, to get the number of bytes already 
> dissected by lower-layer dissectors ?  In other words, can I get the 
> index relative to start of a frame/packet buffer?  From my dissector 
> point of view, for instance, the relative index to the start of the 
> tvbuff passed to it is of course 0, which could be let's say index 50 
> relative to the absolute start of the ethernet frame/packet.

What if the packet your dissector has been given has been reassembled 
from data in multiple link-layer frames?  In that case, it's not clear 
the question you're trying to ask in your dissector *has* an answer.

What are you planning to do with that value?