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Re: Subversion Idea

From: Tim Hill <drtimhill_at_comcast.net>
Date: 2006-12-07 02:44:58 CET

On Dec 6, 2006, at 5:14 PM, Andy Levy wrote:

> On 12/6/06, Tim Hill <drtimhill@comcast.net> wrote:
>>
>>
>>
>> Actually, it would probably work best if OOo stored the files using a
>> non-compressed ZIP format, since in general using things like LZW
>> compression pretty much defeats the xdelta algorithm used by
>> Subversion.
>
> We're sliding off-topic here, but isn't the ZIP compression part of
> the OpenDocument format in the first place?

Yes, and while normally this is good (imho), it creates havoc for
xdelta, or similar binary delta schemes. Essentially, the sequence:
unzip, edit, rezip will tend to generate a new binary that is only
marginally related to the original, since the nature of LZW is to
"smear" changes over the files bytes. It will work, of course (as in
no data loss), but it won't get a good delta compression.

--Tim

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Received on Thu Dec 7 02:47:05 2006

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