-----Original Message-----
From: wireshark-dev-bounces@xxxxxxxxxxxxx [mailto:wireshark-dev-bounces@xxxxxxxxxxxxx] On Behalf Of didier
Sent: den 18 november 2009 05:51
To: Developer support list for Wireshark
Subject: Re: [Wireshark-dev] Optimization - accumulative filters?
Hi,
Le jeudi 05 novembre 2009 à 23:48 +0800, yami a écrit :
>> I once implemented a quite usable prototype with similar idea, but
>> more general.
>>
>> You may be interested in it:
>> http://wiki.wireshark.org/Development/FastFiltering
>>
>> (Oooh, I have not update the patch for a long time...)
>If there's an interest I can extract my stuff based on Yami's work.
>
>Patches would be:
>1) don't decode packets when clearing the filter expression.
>
>2) use copy by value rather than by reference for fvalues in expression syntax tree. It's needed later and
>anyway:
>- It's not in the fast path.
>- It close a trivial memory leak.
>
>3) Minor change in filter compilation: define a check only syntax function.
>
>4) Use Yami work for finding and saving common subexpressions in filters, saved in a 64 bits field in frame
>data.
>
>Notes:
>- It doesn't use Yami SAT but builds a true table and checks against it.
>Ex:
>tcp.stream==0 ==> save as v1
>!(tcp.stream==0) ==> reduce to '!v1', save as v2 True table for !v1
>v1 S
>0 1
>1 0
>No need to decode packets
>
>'!(tcp.stream==0) && tcp.port==foo' ==> reduce to 'v2 && tcp.port==foo'
>True table
>v2 tcp.port==foo S
>0 unknown 0
>1 unknown 2
>0 unknown 0
>1 unknown 2
>Only have to decode packet if S == 2
>
>Didier
I had a much simpler aproach in mind
- Add a new filter box in the filter toolbar.
- When a filter is added "run" it on the vissible packets e.g the ones that pased the previous filter
using the new_packet_list's "vissible packets list"
Regards
Anders
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