Compressed backup
Rusty Russell
rusty at rustcorp.com.au
Tue Jun 4 18:03:02 EST 2002
In message <20020604174317.A26097 at beernut.flames.org.au> you write:
> window of the data in the file (so that it is position-independent, but
> data-dependent). You simply perform a compression reset whenever this
> heuristic is true (and N should be a number that's large enough so that you
> don't reset too often, yet small enough so that rsync can find the most
> matching data). I was thinking a heuristic along the lines of "the least
> significant bits of the previous 12 bytes are 101111010101" (a number derived
> from my initials), giving an N of 4096. This would allow the compression
> resets to sync up at the first run of 12 identical bytes after the change in
> the source text.
No, it would allow you to sync up after the first 12 bytes which had
those LSBs, ie. after about 4096 bytes.
So, you don't win,
Rusty.
--
Anyone who quotes me in their sig is an idiot. -- Rusty Russell.
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