On Wed, Nov 03, 2004 at 12:23:12PM -0600, John Goerzen wrote: > What about rdiff and librdiff? It seems like we already have this. > > It's even being used (see rdiff-backup)
rdiff is different in that it generates a delta between two version of the same file, you can then get the small delta and apply it to the old version. zsync generates a rolling checksum file from the new file (without an old file) which you can download and calculate the parts of the new file that you need to get to bring you old version up to date. this is better if you have multipe versions of the file (e.g. something that changes frequently), and (only) if your communication channel supports getting parts of a file (like http) hope that helps robert -- Robert Lemmen http://www.semistable.com
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