Re: [lwip-users] p->payload == iphdr failed...

[Jonathan Larmour]

Ed Sutter wrote:
> Jonathan Larmour wrote:
> > Ah I see in the implementation of pbuf_header, that it can't expand
> > PBUF_REFs to the front. That will be your problem.
> >
> > I think the only reason it doesn't do it is because there's no way to
> > sanity check that it's a valid thing to do.
>
> Hmmmm...
> If I can't use PBUF_RAW/PBUF_REF to allocate the pbuf, then does that
> mean I have no choice but to do the loop of memcpy's like this...
[snip]
> Or is there some other way to avoid that copy loop?

I think the better answer for you would be to adjust the PBUF_REF case in 
pbuf_header() to allow PBUF_REF pbufs to be expanded to the front.

I'm undecided whether that would be a good change to have in the master 
code base.

Jifl
--
eCosCentric Limited      http://www.eCosCentric.com/     The eCos experts
Barnwell House, Barnwell Drive, Cambridge, UK.       Tel: +44 1223 245571
Registered in England and Wales: Reg No 4422071.
------["The best things in life aren't things."]------      Opinions==mine