"Horst H. von Brand" <vonbrand@xxxxxxxxxxxx> wrote: > Shawn Pearce <spearce@xxxxxxxxxxx> wrote: > > [...] > > > And yet I get good delta compression on a number of ZIP formatted > > files which don't get good additional zlib compression (<3%). > > .zip is something like a tar of the compressed files, if the files inside > the archive don't change, the deltas will be small. Yes, especially when the new zip is made using the exact same software with the same parameters, so the resulting compressed file stream is identical for files whose content has not changed. :-) Since this is actually a JAR full of Java classes which have been recompiled, its even more interesting that javac produced an identical class file given the same input. I've seen times where it doesn't thanks to the automatic serialVersionUID field being somewhat randomly generated. -- Shawn. - To unsubscribe from this list: send the line "unsubscribe git" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html