Lua stringz

["Maynard, Christopher via Wireshark-dev" <wireshark-dev () wireshark org>]

Hi list,

I was successfully using tvbrange:stringz() to retrieve a NULL-terminated string from a tvb, that is until I recently 
encountered a string containing extended-ASCII characters, at which point things starting failing because the length of 
the string returned was too long.  To work around the problem, I switched to using tvbrange:strsize() instead.

To help illustrate the problem, I've attached a simple Lua dissector and pcap file.  The Lua dissector has a preference 
for switching between using stringz() or strsize().  I've also attached the exported textual representations, both with 
"use_stringz" enabled and with it disabled (so it's using strsize() instead).

Is this expected, or is this perhaps a bug?  Has anyone else encountered something like this?

Thanks.
- Chris
Ref:
11.8.3.21. tvbrange:stringz([encoding])
11.8.3.22. tvbrange:strsize([encoding])
https://www.wireshark.org/docs/wsdg_html_chunked/lua_module_Tvb.html












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Attachment: foo_stringz_false.txt
Description: foo_stringz_false.txt

Attachment: foo_stringz_true.txt
Description: foo_stringz_true.txt

Attachment: foo.lua
Description: foo.lua

Attachment: foo_stringz.pcap
Description: foo_stringz.pcap

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