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author | Phillip Lougher <phillip@lougher.demon.co.uk> | 2009-10-06 05:04:15 +0200 |
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committer | Phillip Lougher <phillip@lougher.demon.co.uk> | 2010-01-20 22:47:47 +0100 |
commit | 4c0f0bb2351bee3de8dd7715ee199454a59f1230 (patch) | |
tree | c552993587a8e87f7ebc0fe0955efdde94cc8884 /fs/squashfs/decompressor.c | |
parent | Squashfs: factor out remaining zlib dependencies into separate wrapper file (diff) | |
download | linux-4c0f0bb2351bee3de8dd7715ee199454a59f1230.tar.xz linux-4c0f0bb2351bee3de8dd7715ee199454a59f1230.zip |
Squashfs: add a decompressor framework
This adds a decompressor framework which allows multiple compression
algorithms to be cleanly supported.
Also update zlib wrapper and other code to use the new framework.
Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
Diffstat (limited to 'fs/squashfs/decompressor.c')
-rw-r--r-- | fs/squashfs/decompressor.c | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/fs/squashfs/decompressor.c b/fs/squashfs/decompressor.c new file mode 100644 index 000000000000..0072ccdac1e2 --- /dev/null +++ b/fs/squashfs/decompressor.c @@ -0,0 +1,58 @@ +/* + * Squashfs - a compressed read only filesystem for Linux + * + * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 + * Phillip Lougher <phillip@lougher.demon.co.uk> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2, + * or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * + * decompressor.c + */ + +#include <linux/types.h> +#include <linux/mutex.h> +#include <linux/buffer_head.h> + +#include "squashfs_fs.h" +#include "squashfs_fs_sb.h" +#include "squashfs_fs_i.h" +#include "decompressor.h" +#include "squashfs.h" + +/* + * This file (and decompressor.h) implements a decompressor framework for + * Squashfs, allowing multiple decompressors to be easily supported + */ + +static const struct squashfs_decompressor squashfs_unknown_comp_ops = { + NULL, NULL, NULL, 0, "unknown", 0 +}; + +static const struct squashfs_decompressor *decompressor[] = { + &squashfs_zlib_comp_ops, + &squashfs_unknown_comp_ops +}; + + +const struct squashfs_decompressor *squashfs_lookup_decompressor(int id) +{ + int i; + + for (i = 0; decompressor[i]->id; i++) + if (id == decompressor[i]->id) + break; + + return decompressor[i]; +} |