fs/squashfs/decompressor.h

   1 #ifndef DECOMPRESSOR_H
   2 #define DECOMPRESSOR_H
   3 /*
   4  * Squashfs - a compressed read only filesystem for Linux
   5  *
   6  * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
   7  * Phillip Lougher <phillip@squashfs.org.uk>
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License
  11  * as published by the Free Software Foundation; either version 2,
  12  * or (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  22  *
  23  * decompressor.h
  24  */
  25
  26 struct squashfs_decompressor {
  27         void    *(*init)(struct squashfs_sb_info *, void *);
  28         void    *(*comp_opts)(struct squashfs_sb_info *, void *, int);
  29         void    (*free)(void *);
  30         int     (*decompress)(struct squashfs_sb_info *, void *,
  31                 struct buffer_head **, int, int, int,
  32                 struct squashfs_page_actor *);
  33         int     id;
  34         char    *name;
  35         int     supported;
  36 };
  37
  38 static inline void *squashfs_comp_opts(struct squashfs_sb_info *msblk,
  39                                                         void *buff, int length)
  40 {
  41         return msblk->decompressor->comp_opts ?
  42                 msblk->decompressor->comp_opts(msblk, buff, length) : NULL;
  43 }
  44
  45 #ifdef CONFIG_SQUASHFS_XZ
  46 extern const struct squashfs_decompressor squashfs_xz_comp_ops;
  47 #endif
  48
  49 #ifdef CONFIG_SQUASHFS_LZO
  50 extern const struct squashfs_decompressor squashfs_lzo_comp_ops;
  51 #endif
  52
  53 #ifdef CONFIG_SQUASHFS_ZLIB
  54 extern const struct squashfs_decompressor squashfs_zlib_comp_ops;
  55 #endif
  56
  57 #endif