Re: pack v4 status

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Hi,

On Tue, 27 Feb 2007, Linus Torvalds wrote:

> On Tue, 27 Feb 2007, Shawn O. Pearce wrote:
> > 
> > We have thus far reformatted OBJ_TREEs with a new dictionary based
> > compression scheme.  In this scheme we pool the filenames and modes
> > that appear within trees into a single table within the packfile.
> > All trees are then converted to use a 22 byte record format:
> > 
> >   - 2 byte network byte order index into the string pool
> >   - 20 byte SHA-1
> 
> Umm. Am I missing something, or is this totally braindamaged?
> 
> Are you really expecting there to never be more than 64k basenames? 
> Trust me, that's a totally broken assumption. Anything that tracks 
> generated stuff will _easily_ have several tens of thousands of random 
> filenames even in a single tree, much less over the whole history of the 
> repository.

The sane thing, of course, is to use some sort of prefix coding, together 
with an escape code.

Ciao,
Dscho

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