target/linux/generic-2.6/patches-2.6.27/003-squashfs_lzma.patch

   1 --- a/fs/squashfs/inode.c
   2 +++ b/fs/squashfs/inode.c
   3 @@ -4,6 +4,9 @@
   4   * Copyright (c) 2002, 2003, 2004, 2005, 2006
   5   * Phillip Lougher <phillip@lougher.org.uk>
   6   *
   7 + * LZMA decompressor support added by Oleg I. Vdovikin
   8 + * Copyright (c) 2005 Oleg I.Vdovikin <oleg@cs.msu.su>
   9 + *
  10   * This program is free software; you can redistribute it and/or
  11   * modify it under the terms of the GNU General Public License
  12   * as published by the Free Software Foundation; either version 2,
  13 @@ -21,6 +24,7 @@
  14   * inode.c
  15   */
  16
  17 +#define SQUASHFS_LZMA
  18  #include <linux/types.h>
  19  #include <linux/squashfs_fs.h>
  20  #include <linux/module.h>
  21 @@ -44,6 +48,19 @@
  22
  23  #include "squashfs.h"
  24
  25 +#ifdef SQUASHFS_LZMA
  26 +#include <linux/LzmaDecode.h>
  27 +
  28 +/* default LZMA settings, should be in sync with mksquashfs */
  29 +#define LZMA_LC 3
  30 +#define LZMA_LP 0
  31 +#define LZMA_PB 2
  32 +
  33 +#define LZMA_WORKSPACE_SIZE ((LZMA_BASE_SIZE + \
  34 +      (LZMA_LIT_SIZE << (LZMA_LC + LZMA_LP))) * sizeof(CProb))
  35 +
  36 +#endif
  37 +
  38  static void squashfs_put_super(struct super_block *);
  39  static int squashfs_statfs(struct dentry *, struct kstatfs *);
  40  static int squashfs_symlink_readpage(struct file *file, struct page *page);
  41 @@ -64,7 +81,11 @@ static int squashfs_get_sb(struct file_s
  42                         const char *, void *, struct vfsmount *);
  43
  44
  45 +#ifdef SQUASHFS_LZMA
  46 +static unsigned char lzma_workspace[LZMA_WORKSPACE_SIZE];
  47 +#else
  48  static z_stream stream;
  49 +#endif
  50
  51  static struct file_system_type squashfs_fs_type = {
  52         .owner = THIS_MODULE,
  53 @@ -249,6 +270,15 @@ SQSH_EXTERN unsigned int squashfs_read_d
  54         if (compressed) {
  55                 int zlib_err;
  56
  57 +#ifdef SQUASHFS_LZMA
  58 +               if ((zlib_err = LzmaDecode(lzma_workspace,
  59 +                       LZMA_WORKSPACE_SIZE, LZMA_LC, LZMA_LP, LZMA_PB,
  60 +                       c_buffer, c_byte, buffer, msblk->read_size, &bytes)) != LZMA_RESULT_OK)
  61 +               {
  62 +                       ERROR("lzma returned unexpected result 0x%x\n", zlib_err);
  63 +                       bytes = 0;
  64 +               }
  65 +#else
  66                 stream.next_in = c_buffer;
  67                 stream.avail_in = c_byte;
  68                 stream.next_out = buffer;
  69 @@ -263,7 +293,7 @@ SQSH_EXTERN unsigned int squashfs_read_d
  70                         bytes = 0;
  71                 } else
  72                         bytes = stream.total_out;
  73 -
  74 +#endif
  75                 up(&msblk->read_data_mutex);
  76         }
  77
  78 @@ -2045,15 +2075,19 @@ static int __init init_squashfs_fs(void)
  79         printk(KERN_INFO "squashfs: version 3.0 (2006/03/15) "
  80                 "Phillip Lougher\n");
  81
  82 +#ifndef SQUASHFS_LZMA
  83         if (!(stream.workspace = vmalloc(zlib_inflate_workspacesize()))) {
  84                 ERROR("Failed to allocate zlib workspace\n");
  85                 destroy_inodecache();
  86                 err = -ENOMEM;
  87                 goto out;
  88         }
  89 +#endif
  90
  91         if ((err = register_filesystem(&squashfs_fs_type))) {
  92 +#ifndef SQUASHFS_LZMA
  93                 vfree(stream.workspace);
  94 +#endif
  95                 destroy_inodecache();
  96         }
  97
  98 @@ -2064,7 +2098,9 @@ out:
  99
 100  static void __exit exit_squashfs_fs(void)
 101  {
 102 +#ifndef SQUASHFS_LZMA
 103         vfree(stream.workspace);
 104 +#endif
 105         unregister_filesystem(&squashfs_fs_type);
 106         destroy_inodecache();
 107  }