When CCP is originally negotiated, the only thing we can be
sure about is that we've started adding data to the inflate
dictionary either before or at the same time as the peer. This
is ok, 'cos DEFLATE is a `sliding window' compressor.
We must call inflate again in case there's any pending output
despite our input buffer being empty. If the output buffer
is in fact already flushed, inflate() returns Z_BUF_ERROR.
There isn't really an error !
(I *really* meant to do this *before* committing the
deflate changes in the first place - oops).
Pppd is horribly broken in this respect - refer to the
ppp man page for details. Ppp *WON'T* negotiate deflate
with pppd by default - you must ``enable'' and ``accept''
``pppd-deflate'' in your config.
While I'm in there, update the cftypes in ccp.c so that
we recognise some more protocols (we don't actually do
anything with them - just send a REJ).
