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Squashfs: add a decompressor framework

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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>
This commit is contained in:
Phillip Lougher
2009-10-06 04:04:15 +01:00
parent f1a40359f8
commit 4c0f0bb235
8 changed files with 184 additions and 51 deletions
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fs/squashfs/decompressor.h Normal file
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#ifndef DECOMPRESSOR_H
#define DECOMPRESSOR_H
/*
* 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.h
*/
struct squashfs_decompressor {
void *(*init)(struct squashfs_sb_info *);
void (*free)(void *);
int (*decompress)(struct squashfs_sb_info *, void **,
struct buffer_head **, int, int, int, int, int);
int id;
char *name;
int supported;
};
static inline void *squashfs_decompressor_init(struct squashfs_sb_info *msblk)
{
return msblk->decompressor->init(msblk);
}
static inline void squashfs_decompressor_free(struct squashfs_sb_info *msblk,
void *s)
{
if (msblk->decompressor)
msblk->decompressor->free(s);
}
static inline int squashfs_decompress(struct squashfs_sb_info *msblk,
void **buffer, struct buffer_head **bh, int b, int offset, int length,
int srclength, int pages)
{
return msblk->decompressor->decompress(msblk, buffer, bh, b, offset,
length, srclength, pages);
}
#endif