Parsing Packets

mat999 · 2016-08-17T20:44:03+00:00

Hello! On Tue, Aug 16, 2016 at 10:04 AM, Robert Paprocki wrote: > Exciting to see this come out! > Thanks. > > There was some brief discussion...

Parsing Packets

mat999

Anyone know a good way to parse a binary packet into something like a struct?

Lets say I have string returned from sock:receive() (or anything) and a C like definition:

struct packet_format {
uint32_t field1;
uint16_t blah2;
char[12] str;
... etc
}

How would I cleanly go about parsing it? Is there any libraries that could make this clean & easy?

Thoughts please.

james_9172

This worked well for me: https://github.com/ToxicFrog/vstruct

On 17 August 2016 at 13:44, Mathew Heard <ma...@gmail.com> wrote:

Anyone know a good way to parse a binary packet into something like a struct?

Lets say I have string returned from sock:receive() (or anything) and a C like definition:

struct packet_format {
uint32_t field1;
uint16_t blah2;
char[12] str;
... etc
}

How would I cleanly go about parsing it? Is there any libraries that could make this clean & easy?

Thoughts please.

.

James Hurst

ja...@pintsized.co.uk

javier

On 17 August 2016 at 13:44, Mathew Heard <ma...@gmail.com> wrote:
> Lets say I have string returned from sock:receive() (or anything) and a C
> like definition:
>
> struct packet_format {
>     uint32_t field1;
>     uint16_t blah2;
>     char[12] str;
> ... etc
> }
>
>
> How would I cleanly go about parsing it?


that's clearly a job for the FFI

-- 
Javier

mat999

I'd rather not sock:receive -> lua string -> ffi and then convert with tonumber / tostring etc.

If I could receive to FFI I'd jump on it, but I think its less optimal in this case.

vstruct looks interesting, I'm looking at it now.

On Wednesday, August 17, 2016 at 11:31:00 PM UTC+10, Javier Guerra wrote:

On 17 August 2016 at 13:44, Mathew Heard <mat...@gmail.com> wrote:
> Lets say I have string returned from sock:receive() (or anything) and a C
> like definition:
>
> struct packet_format {
> uint32_t field1;
> uint16_t blah2;
> char[12] str;
> ... etc
> }
>
>
> How would I cleanly go about parsing it?

that's clearly a job for the FFI

--
Javier

luis.gasca

Try http://www.inf.puc-rio.br/~roberto/struct/