move the lzma decompressor out of squashfs-lzma patch and into a new patch (i want to use it for initramfs in the future)

SVN-Revision: 7001

1 files changed, 109 insertions, 0 deletions

diff --git a/target/linux/generic-2.6/patches/003-squashfs_lzma.patch b/target/linux/generic-2.6/patches/003-squashfs_lzma.patch
new file mode 100644
index 0000000000..6a21227dcb
--- /dev/null
+++ b/target/linux/generic-2.6/patches/003-squashfs_lzma.patch
@@ -0,0 +1,109 @@
+diff -urN linux-2.6.19.old/fs/squashfs/inode.c linux-2.6.19.dev/fs/squashfs/inode.c
+--- linux-2.6.19.old/fs/squashfs/inode.c	2006-12-14 03:13:20.000000000 +0100
++++ linux-2.6.19.dev/fs/squashfs/inode.c	2006-12-14 03:13:20.000000000 +0100
+@@ -4,6 +4,9 @@
+  * Copyright (c) 2002, 2003, 2004, 2005, 2006
+  * Phillip Lougher <phillip@lougher.org.uk>
+  *
++ * LZMA decompressor support added by Oleg I. Vdovikin
++ * Copyright (c) 2005 Oleg I.Vdovikin <oleg@cs.msu.su>
++ *
+  * 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,
+@@ -21,6 +24,7 @@
+  * inode.c
+  */
+ 
++#define SQUASHFS_LZMA
+ #include <linux/types.h>
+ #include <linux/squashfs_fs.h>
+ #include <linux/module.h>
+@@ -44,6 +48,19 @@
+ 
+ #include "squashfs.h"
+ 
++#ifdef SQUASHFS_LZMA
++#include <linux/LzmaDecode.h>
++
++/* default LZMA settings, should be in sync with mksquashfs */
++#define LZMA_LC 3
++#define LZMA_LP 0
++#define LZMA_PB 2
++
++#define LZMA_WORKSPACE_SIZE ((LZMA_BASE_SIZE + \
++      (LZMA_LIT_SIZE << (LZMA_LC + LZMA_LP))) * sizeof(CProb))
++
++#endif
++
+ static void squashfs_put_super(struct super_block *);
+ static int squashfs_statfs(struct dentry *, struct kstatfs *);
+ static int squashfs_symlink_readpage(struct file *file, struct page *page);
+@@ -64,7 +81,11 @@
+ 			const char *, void *, struct vfsmount *);
+ 
+ 
++#ifdef SQUASHFS_LZMA
++static unsigned char lzma_workspace[LZMA_WORKSPACE_SIZE];
++#else
+ static z_stream stream;
++#endif
+ 
+ static struct file_system_type squashfs_fs_type = {
+ 	.owner = THIS_MODULE,
+@@ -249,6 +270,15 @@
+ 	if (compressed) {
+ 		int zlib_err;
+ 
++#ifdef SQUASHFS_LZMA
++		if ((zlib_err = LzmaDecode(lzma_workspace,
++			LZMA_WORKSPACE_SIZE, LZMA_LC, LZMA_LP, LZMA_PB,
++			c_buffer, c_byte, buffer, msblk->read_size, &bytes)) != LZMA_RESULT_OK)
++		{
++			ERROR("lzma returned unexpected result 0x%x\n", zlib_err);
++			bytes = 0;
++		}
++#else
+ 		stream.next_in = c_buffer;
+ 		stream.avail_in = c_byte;
+ 		stream.next_out = buffer;
+@@ -263,7 +293,7 @@
+ 			bytes = 0;
+ 		} else
+ 			bytes = stream.total_out;
+-
++#endif
+ 		up(&msblk->read_data_mutex);
+ 	}
+ 
+@@ -2045,15 +2075,19 @@
+ 	printk(KERN_INFO "squashfs: version 3.0 (2006/03/15) "
+ 		"Phillip Lougher\n");
+ 
++#ifndef SQUASHFS_LZMA
+ 	if (!(stream.workspace = vmalloc(zlib_inflate_workspacesize()))) {
+ 		ERROR("Failed to allocate zlib workspace\n");
+ 		destroy_inodecache();
+ 		err = -ENOMEM;
+ 		goto out;
+ 	}
++#endif
+ 
+ 	if ((err = register_filesystem(&squashfs_fs_type))) {
++#ifndef SQUASHFS_LZMA
+ 		vfree(stream.workspace);
++#endif
+ 		destroy_inodecache();
+ 	}
+ 
+@@ -2064,7 +2098,9 @@
+ 
+ static void __exit exit_squashfs_fs(void)
+ {
++#ifndef SQUASHFS_LZMA
+ 	vfree(stream.workspace);
++#endif
+ 	unregister_filesystem(&squashfs_fs_type);
+ 	destroy_inodecache();
+ }
+