Carsten Fuchs wrote:
However, I was wondering how I best read zero-terminated strings?
Of course it is possible to loop over i until
buffer(offset+i, 1):uint8() == 0
then
i = i + 1 -- Read the zero as well.
subtree:add(CafuProto.fields.MyString, buffer(offset, i));
offset = offset + i
But I was wondering if there is a more direct and/or more elegant way?
Btw., what is the difference between ProtoField.string and
ProtoField.stringz as mentioned at
http://www.wireshark.org/docs/wsug_html_chunked/lua_module_Proto.html#lua_class_ProtoField
?
To use 'string' fields you'll need to determine the string length first.
'stringz' fields are strings that you're sure are NULL-terminated and so
you should be able to use a length of -1 (which means "continue to the
NULL terminator") but I'm not sure how that can be done in the Lua API
(maybe you can just past -1 to the length in buffer()?).