Hi,
This change set adds support for binary and ascii modes in 
SocketStreams, and implements the methods nextAvailable and 
nextAvailable:. I've been using it for about 2 weeks and seems to work 
fine, but I think it needs more testing.

http://community.corest.com/~luciano/etc/SocketStreamEnh.cs.gz
http://map1.squeakfoundation.org/sm/package/6ecdc10e-292c-4da5-bfb9-a93e930bea07