Re: [Lzip-bug] Re: performance: gzip, lzip, xz

[Antonio Diaz Diaz]

Jim Meyering wrote:
> Perhaps you're imagining that filters will be added willy-nilly,
> without a thought to long-term usability and the possibility of bloat.

Well, who guarantees filters will not be added willy-nilly? Or that a 
newly added filter won't interact badly with an existing one? Since the 
xz format allows many changes, I assume some changes will be made. Else 
its modifiability would be a waste.


> Can you name archiver formats that specify subblock-like filters?

Yes, RAR. See the file headers.hpp in unrar source.


> lzip 1.5 supports the version 1 file format, but it does not support the
> sync flush marker, which lzip 1.7 and later support.  Look for "Sync Flush
> marker" in decoder.cc.  Equivalent code is not present in 1.5.

This is not exactly a format change. I added that marker from lzlib for 
interoperability with lzlib, but lzip itself does not use the "Sync 
Flush marker" for anything.


Regards,
Antonio.