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From: | Paolo Bonzini |
Subject: | [Qemu-devel] Re: [PATCH] Add tar container format |
Date: | Mon, 17 Aug 2009 14:05:26 +0200 |
User-agent: | Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.1) Gecko/20090814 Fedora/3.0-2.6.b3.fc11 Lightning/1.0pre Thunderbird/3.0b3 |
Bzip2 is supposed to be chunkable, but I haven't found anyone who did this yet and my knowledge in compression is pretty small.
Bzip2 proceeds in chunks of approximately 100-900 KB size. However, the size is taken after an initial RLE compression pass. So bzip2 is only chunkable if you remove the initial RLE compression---this means hacking the bzip2 executable (see ADD_CHAR_TO_BLOCK and add_pair_to_block) in bzip2's bzlib.c.
Using GIO may have been a good idea a few years ago, but it seems a bit overengineered given that the block layer of qemu works well and it is pretty complex.
Paolo
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