Perhaps you can try (I do not test):
temparray.tvb()
I found this from epan/wslua/wslua_tvb.c by searching new_real.
Perhaps
http://www.wireshark.org/docs/wsug_html_chunked/wsluarm_modules.html
is outdated?
On Tue, Jun 16, 2009 at 9:34 PM, cyril leguienne <[email protected]>wrote:
> Hello everybody,
> I don't know if it is the right place to ask the question, let me know
> if not.
> I am currently writting a simple dissector using lua for a proprietary
> protocol.
> This protocol is quite basic ,i.e : frame start character+ data + frame
> stop character .
> But the problem is that the data field can contain frame start or stop
> characters that must be escaped with an escape character.
> In order to pass the data field to another dissector I have to remove
> the escape characters from the tvb before. But there are no function to
> remove data from a tvb nor a tvbrange nor byte array.
> I then wrote the following code:
> function netx_proto.dissector(buffer,pinfo,tree)
> pinfo.cols.protocol = "NetX"
> packetnum = pinfo.number
> local subtree_packet = tree:add(netx_proto,buffer(),"NetX Protocol
> ("..buffer:len()..")")
> local msgbufferarray = buffer(1,buffer:len()-2):bytes()--Here I get
> a byte array containing the data section from the frame
> local temparray=ByteArray.new()--allocation for a buffering byte array
> local offset=0
> for i=0,msgbufferarray:len()-2 do -- I go through the array
> if (msgbufferarray:get_index(i+1)==0x5C
> or msgbufferarray:get_index(i+1)==0x10
> or msgbufferarray:get_index(i+1)==0x13)
> and msgbufferarray:get_index(i)==0x5C then--here I m looking
> for escape sequences
> temparray.append(msgbufferarray:subset(offset,i+1))--if
> found I get a subset for the array that I append to the buffering array
> offset=offset+i+1
> end
> end
> msgbuffer = Tvb.new_real(temparray)--Here I try to create a new tvb
> without escape sequence from the temporary bytearray
>
> I then have an runtime error telling me "attempt to call field
> 'new_real'(a nil value)". I'm quite puzzled as I can't find an example
> of Tvb creation in the documentation and in forums.
> If someone could give me a clue about how to solve my problem.
> Thanks
>
> Cyril
>
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