Re: tvb_composite

[Jeff Morriss <jeff.morriss.ws () gmail com>]

Yosi Saggi wrote:
> Hi
>
> I have a question about the “tvb_composite…” functions.
>
> I have an Ethernet message that comes in chunks. All of the payload is 
> in the Ethernet message, just divided to several chunks of data.
>
> I have used “tvb_composite_append” function to collect all the chunks 
> into one tvb. And used the “tvb_composite_finalize” to finalize the tvb.
>
> The problem is that the new tvb has no “real_data” inside. Therefore I 
> can’t use any “tvb_get..” functions.
>
> I have also noticed that the (tvbuff_t*)new_tvb->used_in->data is the 
> end of the buffer and not the beginning. If it was the beginning I could 
> have used that. It doesn’t matter if I use prepend or append the result 
> is the same.
>
> I have 3 chunks’ meaning the usage count is = 4. The beginning of the 
> data is at (tvbuff_t*)new_tvb->used_in->next->next->data, why is that?
>
> Is there a way to use the finialized new_tvb buffer as I would use any 
> subset_tvb ?

epan/tvbtest.c says:

~~~
#if 0
        /* Composite tvbuffs don't work at the moment -- tests 
commented out until
         * they do. */
~~~

I've never heard of anyone successfully using composite TVBs so I'm 
guessing the comment (from 2007) is still accurate.
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