https://gitlab.com/wireshark/wireshark/-/issues/16451 Improve documentation for tvbrange:uncompress, and add similar methods for other compression algorithms
Is it a matter of adding Lua support for one of the existing compression algorithms ( https://gitlab.com/wireshark/wireshark/-/blob/master/epan/tvbuff.h)? On Thu, Jun 1, 2023 at 3:07 AM Ariel Burbaickij <ariel.burbaic...@gmail.com> wrote: > Hello Chuck, all, > yes, it is not a bad starter, indeed, the key line in this context is > this one, of course: > > if proto_zip.prefs.decompress and comp_method == 8 then > local data_tvb = tvb(offset, > data_len):uncompress("Decompressed data") > > so, it operates on DEFLATE (method 8 as per ZIP spec) method by default. > Which leads to the next question: can/should functions in LUA, uncompress > in this case, be overridden, it is a generic term but I guess you got an > idea -- same name/access to tvb but different functionality, as in my > specific case it is for sure not what is used for compression ? > > Kind Regards > Ariel Burbaickij > > > > > On Thu, Jun 1, 2023 at 7:47 AM chuck c <bubbas...@gmail.com> wrote: > >> https://wiki.wireshark.org/Contrib#file-formats >> file-zip.lua - 2016-12-22 - 1.11.3? - Dissects the structure of a Zip >> archive using heuristics. Hosted on git.lekensteyn.nl >> >> local data_tvb = tvb(offset, >> data_len):uncompress("Decompressed data") >> >> On Wed, May 31, 2023 at 3:52 PM Maynard, Chris via Wireshark-users < >> wireshark-users@wireshark.org> wrote: >> >>> I don’t have any examples to share, but Lua does have support for >>> compressed data in the form of tvbrange:uncompress(name). You could >>> searching at https://wiki.wireshark.org/Lua (as well as the examples >>> and contrib pages) to **possibly** find some examples using it. >>> >>> >>> >>> - Chris >>> >>> Ref: 11.6.3.28. tvbrange:uncompress(name): >>> https://www.wireshark.org/docs/wsdg_html/#lua_class_TvbRange >>> >>> >>> >>> >>> >>> *From:* Wireshark-users <wireshark-users-boun...@wireshark.org> *On >>> Behalf Of *Ariel Burbaickij >>> *Sent:* Wednesday, May 31, 2023 4:35 AM >>> *To:* Community support list for Wireshark < >>> wireshark-users@wireshark.org> >>> *Subject:* [Wireshark-users] LUA support for compressed protocols >>> >>> >>> >>> Hello community, >>> >>> Wireshark Developers' Guide in section 9.4 provides a rough guideline >>> for C dissector plugin. I am looking for some examples on how to handle >>> compressed protocols (in the specific case -- something V.42bis over TCP >>> inspired) in LUA. Are you aware of any such examples ? >>> >>> >>> >>> Kind Regards >>> >>> Ariel Burbaickij >>> CONFIDENTIALITY NOTICE: This message is the property of International >>> Game Technology PLC and/or its subsidiaries and may contain proprietary, >>> confidential or trade secret information. This message is intended solely >>> for the use of the addressee. If you are not the intended recipient and >>> have received this message in error, please delete this message from your >>> system. Any unauthorized reading, distribution, copying, or other use of >>> this message or its attachments is strictly prohibited. >>> >>> ___________________________________________________________________________ >>> Sent via: Wireshark-users mailing list <wireshark-users@wireshark.org >>> > >>> Archives: https://www.wireshark.org/lists/wireshark-users >>> Unsubscribe: https://www.wireshark.org/mailman/options/wireshark-users >>> mailto:wireshark-users-requ...@wireshark.org >>> ?subject=unsubscribe >>> >> >> ___________________________________________________________________________ >> Sent via: Wireshark-users mailing list <wireshark-users@wireshark.org> >> Archives: https://www.wireshark.org/lists/wireshark-users >> Unsubscribe: https://www.wireshark.org/mailman/options/wireshark-users >> mailto:wireshark-users-requ...@wireshark.org >> ?subject=unsubscribe >> > ___________________________________________________________________________ > Sent via: Wireshark-users mailing list <wireshark-users@wireshark.org> > Archives: https://www.wireshark.org/lists/wireshark-users > Unsubscribe: https://www.wireshark.org/mailman/options/wireshark-users > mailto:wireshark-users-requ...@wireshark.org > ?subject=unsubscribe >
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