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Re: Autoexpanding ZIP archives?

From: Peter Samuelson <peter_at_p12n.org>
Date: 2005-12-08 08:47:38 CET

[André Pönitz]
> There are basically two points coming up in the discussions:
> 1. (religious) Everybody should use text everywhere.
> 2. (semi-technical) One cannot trust clients to have proper
> filter installed, so interaction with clients may fail.

  3. (technical) For every compression codec, you need to have a way to
     make sure the subversion client or server can recompress to the
     original input. This is important for anyone who uses checksums
     or digital signatures. And with many if not all compression
     codecs, the exact compressed output is implementation-dependent,
     even if implementations are compatible and the *uncompressed* bits
     are lossless.

     So this proposal only works in a homogeneous world where everyone
     is using the same copy of zlib, and always uses gzip -9. I don't
     think we live in that world, though for some codecs we might. For
     other types of codecs, this is even dicier - would you like to
     assert that you can get a bit-for-bit identical copy of a Word
     document after opening and saving it, for instance? (I'd bet
     serious money you won't.)

Received on Thu Dec 8 08:48:33 2005

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