[U-Boot] [PATCH 1/2] Add support for XZ decompression algorithm.

[Mike Frysinger <vapier@gentoo.org>]

On Monday, December 06, 2010 12:58:37 Peter Tyser wrote:
> On Sun, 2010-12-05 at 16:16 +0100, Luigi 'Comio' Mantellini wrote:
> > XZ (aka LZMA2) is the new version of lzma compression format.
> > The following patch add a cut-down version of XZ Embedded library
> > (v20100702) that supports only single-call API.
> > 
> > In order to enable XZ support, the CONFIG_XZ must be defined by board
> > configuration file.
> > 
> > For any details, please refer to XZ Embedded homesite
> > (http://tukaani.org/xz/embedded.html)
> 
> If I understand the xz format correctly, its nearly identical to lzma,
> and the 'xz' utility can decompress .lzma files too.  Any chance the xz
> code you're adding can be used to handle lzma-compressed archives?  If
> so, can we deprecate CONFIG_LZMA and have the new CONFIG_XZ support
> handle both .xz and .lzma archives?  Or at least share a significant
> chunk of code between the two formats?

my understanding is that the compression algorithm is the same, but the ".xz" 
file format adds nice/detectable header of metadata where as ".lzma" does not.

so yes, i believe the two should have quite a lot of [undesirable] overlap.
-mike
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