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Re: Migrations to xorriso
From: |
Thomas Schmitt |
Subject: |
Re: Migrations to xorriso |
Date: |
Wed, 19 May 2010 21:34:28 +0200 |
Hi,
Isaac Dupree wrote:
> What size range are the whole images?
The minimum output of grub-mkrescue 1.98 with
xorriso is 1544192 bytes.
grub-mkisofs: 1550336
genisoimage: 1859584 (-307200 with -no-pad)
One may add lots of other files, of course.
> Also I guess no one compresses whole ISOs
It makes few sense to compress the ISO as a
whole. But one could compress some files in it.
One could implement a reader for H. Peter Anvin's
zisofs format in GRUB's ISO 9660 reader - if not
present already.
zisofs is a transparent content compression of
single files. A reader is implemented in the
Linux kernel. See macro CONFIG_ZISOFS in
fs/isofs/*.[ch].
An authorised description is given in
doc/zisofs_format.txt of xorriso resp. in
http://bazaar.launchpad.net/~libburnia-team/libisofs/scdbackup/annotate/head:/doc/zisofs_format.txt
The ISO 9660 directory tree stays uncompressed.
Compressed and uncompressed files can be mixed.
xorriso can produce zisofs compressed data files
on the fly (needs zlib).
A grub-mkrescue 1.98 image with all files
compressed has 884736 bytes. But one would have
to leave those files uncompressed which are
needed for reading ISO 9660 and zisofs
compression.
Have a nice day :)
Thomas
- Re: Migrations to xorriso, (continued)
Re: Migrations to xorriso, Vladimir 'φ-coder/phcoder' Serbinenko, 2010/05/19
Re: Migrations to xorriso, Thomas Schmitt, 2010/05/20