Re: Solving the compression dilema when rsync-ing Debian versions
No, this won't work with very many compression algorithms. Most algorithms update their dictionaries/probability tables dynamically based on input. There isn't just one static table that could be used for another file, since the table is automatically updated after every (or near every) transmitted or decoded symbol. Further, the algorithms start with blank tables on both ends (compression and decompression), the algorithm doesn't transmit the tables (which can be quite large for higher order statistical models). Well the table is perfectly static when the compression ends. Even if the table isn't transmitted itself, its information is contained in the compressed file, otherwise the file couldn't be decompressed either. But the tables you have at the end of the compression are NOT what you want to use for the entire process. The point of a dynamic table is to allow the probabilities of different symbols to change dynamically as the compression happens. The tables used by the end of the file may be very different than those used early in the file, to the point where they are useless for the early part of the file. Without fear of sounding redundent, EACH symbol is encoded with a different set of tables. That is the probability tables or dictionaries are different for EACH and EVERY character of the file. And as I said before, the tables from latter in the compression (which you propose using all the time) will not even generate the same compressed file as the one they are based on nor will they be anywhere near optimal for the file. That is, gzip --compress-like=foo.gz foo would generate a entirely different foo.gz than gzip foo would. I really suggets you investigate LZW based algorithms. You would find they do not behave as you think. Only incredibly simple static compression algorithms have the properties you desire. Andrew Lenharth
Re: Solving the compression dilema when rsync-ing Debian versions
No, I want rsync not even to be mentioned. All I want is something similar to gzip --compress-like=old-foo foo where foo will be compressed as old-foo was or as aquivalent as possible. Gzip does not need to know anything about foo except how it was compressed. The switch --compress-like could be added to any compression algorithmus (bzip?) as long as it's easy to retrieve the compression scheme. Besides the following is completly legal but probably not very sensible No, this won't work with very many compression algorithms. Most algorithms update their dictionaries/probability tables dynamically based on input. There isn't just one static table that could be used for another file, since the table is automatically updated after every (or near every) transmitted or decoded symbol. Further, the algorithms start with blank tables on both ends (compression and decompression), the algorithm doesn't transmit the tables (which can be quite large for higher order statistical models). I suggest you read about LZW and arithmetic encoding with higher order stitistical models. Try The Data Compression Book by Nelson (?) for a fairly good overview of how these work. What is better and easier is to ensure that the compression is deturministic (gzip by default is not, bzip2 seems to be), so that rsync can decompress, rsync, compress, and get the exact file back on the other side. Andrew Lenharth
Re: Bochs / VGA-Bios license question / freebios anyone?
I originally ITPed bochs. Unfortunately it would have to go in non-free. the VGA-BIOS included is licensed only for use and distribution with bochs. It therefor cannot be seperated into a seperate package from bochs (and if bochs is packaged, it should ge removed from the source archive. Andrew Lenharth Remember, never ask a geek why; just nod your head and back away slowly... -- Given infinite time, 100 monkeys could type out the complete works of Shakespeare. Win 98 source code? Eight monkeys, five minutes. -- On 14 Aug 2000, Peter Makholm wrote: Adrian Bunk [EMAIL PROTECTED] writes: That sounds as if non-free is the right place. Or the best is you make two packages: A vga-bios package in non-free and a bochs package in contrib. But why would this be better that a complete package in contrib. Is bochs useable without the vga-bios or is the vga-bios useable for other things than bochs? I was about to package bochs a couple of months ago but this was one of the things stopping me. And then it neither booted my QNX, Eros or Plan9 boot disks. -- Peter -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
how about a real unstable?
I know others have expressed this, but a big reason we wind up with slower release cycles is we have a stable unstable. i.e. unstable is rather stable. Most of the other distributions start with the software that will be released by the time they release and start working with it early. What I really mean: unstable should (as soon as work on potato is finished), have the new perl, xfree, apache, kernel, etc. Even if they are still release canidates. the sooner we have everything working with the new packages, the sooner we can release. For example, to wait till perl 5.6 is out to try to integrate it could take longer that to start the integration process with a perl release canidate. It is the unstable branch, lets take advantage of it and make it unstable to start out with. The sooner we can find problems and fix them, the shorter our release cycles will be, and the more upto-date our main packages will be. Andrew Lenharth Remember, never ask a geek why; just nod your head and back away slowly... -- Given infinite time, 100 monkeys could type out the complete works of Shakespeare. Win 98 source code? Eight monkeys, five minutes. --
