Re: Dissector callback definition

[Stephen Fisher <steve () stephen-fisher com>]

On Dec 2, 2009, at 11:08 AM, Joshua Wright wrote:

> The README.developer sample code shows the dissector callback function
> as shown:
>
> /* Code to actually dissect the packets */
> static int
> dissect_PROTOABBREV(tvbuff_t *tvb, packet_info *pinfo, proto_tree  
> *tree)
> {
>
> /* ... */
>
> /* Return the amount of data this dissector was able to dissect */
>       return tvb_length(tvb);
> }
>
> However, other source shows this function as having return type static
> void.  Is it not necessary to return the number of bytes the dissector
> processed any longer?

Returning the number of bytes dissected is the new and preferred  
method of handling dissectors.  In order to have the number of bytes  
dissected handled, the dissector needs to be registered as a new style  
one such as is shown in README.developer:

         PROTOABBREV_handle =  
new_create_dissector_handle(dissect_PROTOABBREV,
                                                           
proto_PROTOABBREV);


Steve

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