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
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