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@lougher.demon.co.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 *);
  28         void    (*free)(void *);
  29         int     (*decompress)(struct squashfs_sb_info *, void **,
  30                 struct buffer_head **, int, int, int, int, int);
  31         int     id;
  32         char    *name;
  33         int     supported;
  34 };
  35
  36 static inline void *squashfs_decompressor_init(struct squashfs_sb_info *msblk)
  37 {
  38         return msblk->decompressor->init(msblk);
  39 }
  40
  41 static inline void squashfs_decompressor_free(struct squashfs_sb_info *msblk,
  42         void *s)
  43 {
  44         if (msblk->decompressor)
  45                 msblk->decompressor->free(s);
  46 }
  47
  48 static inline int squashfs_decompress(struct squashfs_sb_info *msblk,
  49         void **buffer, struct buffer_head **bh, int b, int offset, int length,
  50         int srclength, int pages)
  51 {
  52         return msblk->decompressor->decompress(msblk, buffer, bh, b, offset,
  53                 length, srclength, pages);
  54 }
  55
  56 #ifdef CONFIG_SQUASHFS_XZ
  57 extern const struct squashfs_decompressor squashfs_xz_comp_ops;
  58 #endif
  59
  60 #ifdef CONFIG_SQUASHFS_LZO
  61 extern const struct squashfs_decompressor squashfs_lzo_comp_ops;
  62 #endif
  63
  64 #endif