Adding bsdiff to the base system

[John Polstra]

On 07-Apr-2005 Colin Percival wrote:
> The reason portsnap is more efficient lies in how portsnap and CVSup
> determine which files need to be updated.  The ports tree contains
> roughly 71000 files, and the first thing the CVSup client does is list
> all of these files and send that list to the server.
> 
> In contrast, portsnap has an index file -- containing, roughly speaking,
> that same list -- and the portsnap client merely sends the sha256 hash of
> this index file to the server, which responds with either "I recognize
> that index -- here's a patch which will turn it into the latest index"
> or "I don't recognize that -- here's the new index".

Nice!

John