setup RFC: Ditch homegrown http/ftp code and use a library?

[Max Bowsher]

I'm looking at the networking code in setup at the moment, as part of the 
grand "Disentangle logic and GUI code" project.

The current code is extremely bare-bones. At some point, it would be nice to 
add resumable downloading, and I'm wondering whether it would be more 
sensible to grab and integrate some pre-existing library, rather then 
re-implement that functionality ourselves.

The other motivation for this is that if we do not bring in a library to 
replace this code, then it will need to be significantly rewritten to break 
the ties between GUI and logic, and probably also needs an audit of the C 
string manipulation and error handling.

So, I'm looking for comments, and suggestions for candidate http/ftp client 
libraries to investigate.

Max.