Wireshark mailing list archives
Re: Simplifying (and fixing) tvbuff [Long]
From: Bill Meier <wmeier () newsguy com>
Date: Tue, 13 Dec 2011 10:38:03 -0500
On 12/12/2011 4:55 PM, Bill Meier wrote:
Summary ------- I've recently been digging into the tvbuff code. <snip> ... and then describe how tvbuff can be simplified.
> <snip> I think the long description boils down to the following: Consider the collection of tvbs (chain) as a stack of tvbs.packet.c pushes the initial tvb onto the stack then calls next dissector; After the dissection is complete, the stack is eventually free'd via a call to tvb_free_chain in epan_dissect_cleanup.
A dissector: - can add new tvbs (real, subset, composite) to the stack handed to it; (Subset and Composite tvbs should reference only tvbs which are towards the beginning of the same stack). - must not save a pointer to a tvb from that stack (handed to it) for use when dissecting another frame (since a higher level function may very well free the stack); - can create its own tvb stack which the dissector is free to manage as desired. ___________________________________________________________________________ Sent via: Wireshark-dev mailing list <wireshark-dev () wireshark org> Archives: http://www.wireshark.org/lists/wireshark-dev Unsubscribe: https://wireshark.org/mailman/options/wireshark-dev mailto:wireshark-dev-request () wireshark org?subject=unsubscribe
Current thread:
- Simplifying (and fixing) tvbuff [Long] Bill Meier (Dec 12)
- Re: Simplifying (and fixing) tvbuff [Long] Bill Meier (Dec 12)
- Re: Simplifying (and fixing) tvbuff [Long] Bill Meier (Dec 13)
- Re: Simplifying (and fixing) tvbuff [Long] Chris Maynard (Dec 14)
- Re: Simplifying (and fixing) tvbuff [Long] Jaap Keuter (Dec 14)
- Re: Simplifying (and fixing) tvbuff [Long] Chris Maynard (Dec 14)
- Re: Simplifying (and fixing) tvbuff [Long] Bill Meier (Dec 21)
- Re: Simplifying (and fixing) tvbuff [Long] Bill Meier (Dec 21)
- Re: Simplifying (and fixing) tvbuff [Long] Jaap Keuter (Dec 24)
- Re: Simplifying (and fixing) tvbuff [Long] Bill Meier (Dec 21)