Wireshark · Wireshark-dev: Re: [Wireshark-dev] LUA Development Issue - Pulling a Character

[LEGO <luis.ontanon@xxxxxxxxx>]

It depends in how you want the char:

- a one byte unsigned integer can be taken with u = tvb(offset,1):get_uint()
- a string containing just one char (supposing it's printable) would
be taken with str = tvb(offset,1):get_string()
- a bytearray that contains just one char would be ba =
tvb(offset,1):get_bytes()
    the you can fetch the value of the first byte with ba[0]

Luis
On 9/28/06, Ahad L. Amdani <ahad.amdani@xxxxxxxx> wrote:
> Ahad L. Amdani <ahad.amdani@...> writes:
>
> >
> > Hello,
> >
> > I'm doing some extension development on Wireshark through LUA and I can't
> seem
> > to find out how to pull just a single character from the packet. The packet
> is
> > encoded in little endian format, so I can use the tvbrange:le_uint and
> > tvbrange:le_float functions to pull those types of values, but there doesn't
> > seem to be a tvbrange:char() -- there is a tvbrange:string() but it doesn't
> > work correctly, or at least, in my experience. I also tried the bytes() and
> > tried to print out the bytearray, but that didn't work either.
> >
>
> I've just read that LUA also supports calling functions written in C. Is there
> a C-based function pre-defined that takes specified amount of bytes or
> characters from the packet? Possibly one that assumes little endian format,
> such as the le_uint() and le_float() functions?
>
> Thanks in advance,
>  Ahad
>
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