On Thu, Oct 20, 2005 at 05:25:07PM -0700, Andy Tai wrote: > Previously there were discussions of how to efficiently store binary > files, like using xdelta or such.
I found "rzip" the other day: The principal advantage of rzip is that it has an effective history buffer of 900 Mbyte. This means it can find matching pieces of the input file over huge distances compared to other commonly used compression programs. The gzip program by comparison uses a history buffer of 32 kbyte and bzip2 uses a history buffer of 900 kbyte. Biggest disadvantage is that it isn't streamable; presumably, it has to work on seekable datasets. But if one replaced zlib with rzip for compressing the tarballs, presumably one could get similar or even better performance to a binary delta without losing information or changing the format. Mind you, a binary delta would be more in keeping with tla's ASCII tradition, where a file is a sum of its patches.
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