Compressed backup

[Rusty Russell]

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.