squashfs-tools/squashfs-tools/squashfs_fs.h - nest-cam/4320010/squashfs-tools - Git at Google

 #ifndef SQUASHFS_FS
 #define SQUASHFS_FS
 /*
  * Squashfs
  *
  * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012,
  * 2013, 2014
  * Phillip Lougher <phillip@squashfs.org.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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  *
  * squashfs_fs.h
  */

 #define SQUASHFS_CACHED_FRAGMENTS	CONFIG_SQUASHFS_FRAGMENT_CACHE_SIZE
 #define SQUASHFS_MAJOR			4
 #define SQUASHFS_MINOR			0
 #define SQUASHFS_MAGIC			0x73717368
 #define SQUASHFS_MAGIC_SWAP		0x68737173
 #define SQUASHFS_START			0

 /* size of metadata (inode and directory) blocks */
 #define SQUASHFS_METADATA_SIZE		8192
 #define SQUASHFS_METADATA_LOG		13

 /* default size of data blocks */
 #define SQUASHFS_FILE_SIZE		131072

 #define SQUASHFS_FILE_MAX_SIZE		1048576
 #define SQUASHFS_FILE_MAX_LOG		20

 /* Max number of uids and gids */
 #define SQUASHFS_IDS			65536

 /* Max length of filename (not 255) */
 #define SQUASHFS_NAME_LEN		256

 #define SQUASHFS_INVALID		((long long) 0xffffffffffff)
 #define SQUASHFS_INVALID_FRAG		((unsigned int) 0xffffffff)
 #define SQUASHFS_INVALID_XATTR		((unsigned int) 0xffffffff)
 #define SQUASHFS_INVALID_BLK		((long long) -1)
 #define SQUASHFS_USED_BLK		((long long) -2)

 /* Filesystem flags */
 #define SQUASHFS_NOI			0
 #define SQUASHFS_NOD			1
 #define SQUASHFS_CHECK			2
 #define SQUASHFS_NOF			3
 #define SQUASHFS_NO_FRAG		4
 #define SQUASHFS_ALWAYS_FRAG		5
 #define SQUASHFS_DUPLICATE		6
 #define SQUASHFS_EXPORT			7
 #define SQUASHFS_NOX			8
 #define SQUASHFS_NO_XATTR		9
 #define SQUASHFS_COMP_OPT		10

 #define SQUASHFS_BIT(flag, bit)		((flag >> bit) & 1)

 #define SQUASHFS_UNCOMPRESSED_INODES(flags)	SQUASHFS_BIT(flags, \
 						SQUASHFS_NOI)

 #define SQUASHFS_UNCOMPRESSED_DATA(flags)	SQUASHFS_BIT(flags, \
 						SQUASHFS_NOD)

 #define SQUASHFS_UNCOMPRESSED_FRAGMENTS(flags)	SQUASHFS_BIT(flags, \
 						SQUASHFS_NOF)

 #define SQUASHFS_NO_FRAGMENTS(flags)		SQUASHFS_BIT(flags, \
 						SQUASHFS_NO_FRAG)

 #define SQUASHFS_ALWAYS_FRAGMENTS(flags)	SQUASHFS_BIT(flags, \
 						SQUASHFS_ALWAYS_FRAG)

 #define SQUASHFS_DUPLICATES(flags)		SQUASHFS_BIT(flags, \
 						SQUASHFS_DUPLICATE)

 #define SQUASHFS_EXPORTABLE(flags)		SQUASHFS_BIT(flags, \
 						SQUASHFS_EXPORT)

 #define SQUASHFS_UNCOMPRESSED_XATTRS(flags)	SQUASHFS_BIT(flags, \
 						SQUASHFS_NOX)

 #define SQUASHFS_NO_XATTRS(flags)		SQUASHFS_BIT(flags, \
 						SQUASHFS_NO_XATTR)

 #define SQUASHFS_COMP_OPTS(flags)		SQUASHFS_BIT(flags, \
 						SQUASHFS_COMP_OPT)

 #define SQUASHFS_MKFLAGS(noi, nod, nof, nox, no_frag, always_frag, \
 		duplicate_checking, exportable, no_xattr, comp_opt) (noi | \
 		(nod << 1) | (nof << 3) | (no_frag << 4) | \
 		(always_frag << 5) | (duplicate_checking << 6) | \
 		(exportable << 7) | (nox << 8) | (no_xattr << 9) | \
 		(comp_opt << 10))

 /* Max number of types and file types */
 #define SQUASHFS_DIR_TYPE		1
 #define SQUASHFS_FILE_TYPE		2
 #define SQUASHFS_SYMLINK_TYPE		3
 #define SQUASHFS_BLKDEV_TYPE		4
 #define SQUASHFS_CHRDEV_TYPE		5
 #define SQUASHFS_FIFO_TYPE		6
 #define SQUASHFS_SOCKET_TYPE		7
 #define SQUASHFS_LDIR_TYPE		8
 #define SQUASHFS_LREG_TYPE		9
 #define SQUASHFS_LSYMLINK_TYPE		10
 #define SQUASHFS_LBLKDEV_TYPE		11
 #define SQUASHFS_LCHRDEV_TYPE		12
 #define SQUASHFS_LFIFO_TYPE		13
 #define SQUASHFS_LSOCKET_TYPE		14

 /* Xattr types */
 #define SQUASHFS_XATTR_USER		0
 #define SQUASHFS_XATTR_TRUSTED		1
 #define SQUASHFS_XATTR_SECURITY		2
 #define SQUASHFS_XATTR_VALUE_OOL	256
 #define SQUASHFS_XATTR_PREFIX_MASK	0xff

 /* Flag whether block is compressed or uncompressed, bit is set if block is
  * uncompressed */
 #define SQUASHFS_COMPRESSED_BIT		(1 << 15)

 #define SQUASHFS_COMPRESSED_SIZE(B)	(((B) & ~SQUASHFS_COMPRESSED_BIT) ? \
 		(B) & ~SQUASHFS_COMPRESSED_BIT :  SQUASHFS_COMPRESSED_BIT)

 #define SQUASHFS_COMPRESSED(B)		(!((B) & SQUASHFS_COMPRESSED_BIT))

 #define SQUASHFS_COMPRESSED_BIT_BLOCK		(1 << 24)

 #define SQUASHFS_COMPRESSED_SIZE_BLOCK(B)	((B) & \
 	~SQUASHFS_COMPRESSED_BIT_BLOCK)

 #define SQUASHFS_COMPRESSED_BLOCK(B)	(!((B) & SQUASHFS_COMPRESSED_BIT_BLOCK))

 /*
  * Inode number ops.  Inodes consist of a compressed block number, and an
  * uncompressed  offset within that block
  */
 #define SQUASHFS_INODE_BLK(a)		((unsigned int) ((a) >> 16))

 #define SQUASHFS_INODE_OFFSET(a)	((unsigned int) ((a) & 0xffff))

 #define SQUASHFS_MKINODE(A, B)		((squashfs_inode)(((squashfs_inode) (A)\
 					<< 16) + (B)))

 /* Compute 32 bit VFS inode number from squashfs inode number */
 #define SQUASHFS_MK_VFS_INODE(a, b)	((unsigned int) (((a) << 8) + \
 					((b) >> 2) + 1))

 /* Translate between VFS mode and squashfs mode */
 #define SQUASHFS_MODE(a)		((a) & 0xfff)

 /* fragment and fragment table defines */
 #define SQUASHFS_FRAGMENT_BYTES(A)	((A) * \
 					sizeof(struct squashfs_fragment_entry))

 #define SQUASHFS_FRAGMENT_INDEX(A)	(SQUASHFS_FRAGMENT_BYTES(A) / \
 					SQUASHFS_METADATA_SIZE)

 #define SQUASHFS_FRAGMENT_INDEX_OFFSET(A)	(SQUASHFS_FRAGMENT_BYTES(A) % \
 						SQUASHFS_METADATA_SIZE)

 #define SQUASHFS_FRAGMENT_INDEXES(A)	((SQUASHFS_FRAGMENT_BYTES(A) + \
 					SQUASHFS_METADATA_SIZE - 1) / \
 					SQUASHFS_METADATA_SIZE)

 #define SQUASHFS_FRAGMENT_INDEX_BYTES(A)	(SQUASHFS_FRAGMENT_INDEXES(A) *\
 						sizeof(long long))

 /* inode lookup table defines */
 #define SQUASHFS_LOOKUP_BYTES(A)	((A) * sizeof(squashfs_inode))

 #define SQUASHFS_LOOKUP_BLOCK(A)		(SQUASHFS_LOOKUP_BYTES(A) / \
 						SQUASHFS_METADATA_SIZE)

 #define SQUASHFS_LOOKUP_BLOCK_OFFSET(A)		(SQUASHFS_LOOKUP_BYTES(A) % \
 						SQUASHFS_METADATA_SIZE)

 #define SQUASHFS_LOOKUP_BLOCKS(A)	((SQUASHFS_LOOKUP_BYTES(A) + \
 					SQUASHFS_METADATA_SIZE - 1) / \
 					SQUASHFS_METADATA_SIZE)

 #define SQUASHFS_LOOKUP_BLOCK_BYTES(A)	(SQUASHFS_LOOKUP_BLOCKS(A) *\
 					sizeof(long long))

 /* uid lookup table defines */
 #define SQUASHFS_ID_BYTES(A)	((A) * sizeof(unsigned int))

 #define SQUASHFS_ID_BLOCK(A)		(SQUASHFS_ID_BYTES(A) / \
 						SQUASHFS_METADATA_SIZE)

 #define SQUASHFS_ID_BLOCK_OFFSET(A)		(SQUASHFS_ID_BYTES(A) % \
 						SQUASHFS_METADATA_SIZE)

 #define SQUASHFS_ID_BLOCKS(A)	((SQUASHFS_ID_BYTES(A) + \
 					SQUASHFS_METADATA_SIZE - 1) / \
 					SQUASHFS_METADATA_SIZE)

 #define SQUASHFS_ID_BLOCK_BYTES(A)	(SQUASHFS_ID_BLOCKS(A) *\
 					sizeof(long long))

 /* xattr id lookup table defines */
 #define SQUASHFS_XATTR_BYTES(A)		((A) * sizeof(struct squashfs_xattr_id))

 #define SQUASHFS_XATTR_BLOCK(A)		(SQUASHFS_XATTR_BYTES(A) / \
 					SQUASHFS_METADATA_SIZE)

 #define SQUASHFS_XATTR_BLOCK_OFFSET(A)	(SQUASHFS_XATTR_BYTES(A) % \
 					SQUASHFS_METADATA_SIZE)

 #define SQUASHFS_XATTR_BLOCKS(A)	((SQUASHFS_XATTR_BYTES(A) + \
 					SQUASHFS_METADATA_SIZE - 1) / \
 					SQUASHFS_METADATA_SIZE)

 #define SQUASHFS_XATTR_BLOCK_BYTES(A)	(SQUASHFS_XATTR_BLOCKS(A) *\
 					sizeof(long long))

 #define SQUASHFS_XATTR_BLK(A)		((unsigned int) ((A) >> 16))

 #define SQUASHFS_XATTR_OFFSET(A)	((unsigned int) ((A) & 0xffff))

 /* cached data constants for filesystem */
 #define SQUASHFS_CACHED_BLKS		8

 #define SQUASHFS_MAX_FILE_SIZE_LOG	64

 #define SQUASHFS_MAX_FILE_SIZE		((long long) 1 << \
 					(SQUASHFS_MAX_FILE_SIZE_LOG - 2))

 #define SQUASHFS_MARKER_BYTE		0xff

 /* meta index cache */
 #define SQUASHFS_META_INDEXES	(SQUASHFS_METADATA_SIZE / sizeof(unsigned int))
 #define SQUASHFS_META_ENTRIES	31
 #define SQUASHFS_META_NUMBER	8
 #define SQUASHFS_SLOTS		4

 struct meta_entry {
 	long long		data_block;
 	unsigned int		index_block;
 	unsigned short		offset;
 	unsigned short		pad;
 };

 struct meta_index {
 	unsigned int		inode_number;
 	unsigned int		offset;
 	unsigned short		entries;
 	unsigned short		skip;
 	unsigned short		locked;
 	unsigned short		pad;
 	struct meta_entry	meta_entry[SQUASHFS_META_ENTRIES];
 };


 /*
  * definitions for structures on disk
  */

 typedef long long		squashfs_block;
 typedef long long		squashfs_inode;

 #define ZLIB_COMPRESSION	1
 #define LZMA_COMPRESSION	2
 #define LZO_COMPRESSION		3
 #define XZ_COMPRESSION		4
 #define LZ4_COMPRESSION		5

 struct squashfs_super_block {
 	unsigned int		s_magic;
 	unsigned int		inodes;
 	int			mkfs_time /* time of filesystem creation */;
 	unsigned int		block_size;
 	unsigned int		fragments;
 	unsigned short		compression;
 	unsigned short		block_log;
 	unsigned short		flags;
 	unsigned short		no_ids;
 	unsigned short		s_major;
 	unsigned short		s_minor;
 	squashfs_inode		root_inode;
 	long long		bytes_used;
 	long long		id_table_start;
 	long long		xattr_id_table_start;
 	long long		inode_table_start;
 	long long		directory_table_start;
 	long long		fragment_table_start;
 	long long		lookup_table_start;
 };

 struct squashfs_dir_index {
 	unsigned int		index;
 	unsigned int		start_block;
 	unsigned int		size;
 	unsigned char		name[0];
 };

 struct squashfs_base_inode_header {
 	unsigned short		inode_type;
 	unsigned short		mode;
 	unsigned short		uid;
 	unsigned short		guid;
 	int			mtime;
 	unsigned int 		inode_number;
 };

 struct squashfs_ipc_inode_header {
 	unsigned short		inode_type;
 	unsigned short		mode;
 	unsigned short		uid;
 	unsigned short		guid;
 	int			mtime;
 	unsigned int 		inode_number;
 	unsigned int		nlink;
 };

 struct squashfs_lipc_inode_header {
 	unsigned short		inode_type;
 	unsigned short		mode;
 	unsigned short		uid;
 	unsigned short		guid;
 	int			mtime;
 	unsigned int 		inode_number;
 	unsigned int		nlink;
 	unsigned int		xattr;
 };

 struct squashfs_dev_inode_header {
 	unsigned short		inode_type;
 	unsigned short		mode;
 	unsigned short		uid;
 	unsigned short		guid;
 	int			mtime;
 	unsigned int 		inode_number;
 	unsigned int		nlink;
 	unsigned int		rdev;
 };

 struct squashfs_ldev_inode_header {
 	unsigned short		inode_type;
 	unsigned short		mode;
 	unsigned short		uid;
 	unsigned short		guid;
 	int			mtime;
 	unsigned int 		inode_number;
 	unsigned int		nlink;
 	unsigned int		rdev;
 	unsigned int		xattr;
 };

 struct squashfs_symlink_inode_header {
 	unsigned short		inode_type;
 	unsigned short		mode;
 	unsigned short		uid;
 	unsigned short		guid;
 	int			mtime;
 	unsigned int 		inode_number;
 	unsigned int		nlink;
 	unsigned int		symlink_size;
 	char			symlink[0];
 };

 struct squashfs_reg_inode_header {
 	unsigned short		inode_type;
 	unsigned short		mode;
 	unsigned short		uid;
 	unsigned short		guid;
 	int			mtime;
 	unsigned int 		inode_number;
 	unsigned int		start_block;
 	unsigned int		fragment;
 	unsigned int		offset;
 	unsigned int		file_size;
 	unsigned int		block_list[0];
 };

 struct squashfs_lreg_inode_header {
 	unsigned short		inode_type;
 	unsigned short		mode;
 	unsigned short		uid;
 	unsigned short		guid;
 	int			mtime;
 	unsigned int 		inode_number;
 	squashfs_block		start_block;
 	long long		file_size;
 	long long		sparse;
 	unsigned int		nlink;
 	unsigned int		fragment;
 	unsigned int		offset;
 	unsigned int		xattr;
 	unsigned int		block_list[0];
 };

 struct squashfs_dir_inode_header {
 	unsigned short		inode_type;
 	unsigned short		mode;
 	unsigned short		uid;
 	unsigned short		guid;
 	int			mtime;
 	unsigned int 		inode_number;
 	unsigned int		start_block;
 	unsigned int		nlink;
 	unsigned short		file_size;
 	unsigned short		offset;
 	unsigned int		parent_inode;
 };

 struct squashfs_ldir_inode_header {
 	unsigned short		inode_type;
 	unsigned short		mode;
 	unsigned short		uid;
 	unsigned short		guid;
 	int			mtime;
 	unsigned int 		inode_number;
 	unsigned int		nlink;
 	unsigned int		file_size;
 	unsigned int		start_block;
 	unsigned int		parent_inode;
 	unsigned short		i_count;
 	unsigned short		offset;
 	unsigned int		xattr;
 	struct squashfs_dir_index	index[0];
 };

 union squashfs_inode_header {
 	struct squashfs_base_inode_header	base;
 	struct squashfs_dev_inode_header	dev;
 	struct squashfs_ldev_inode_header	ldev;
 	struct squashfs_symlink_inode_header	symlink;
 	struct squashfs_reg_inode_header	reg;
 	struct squashfs_lreg_inode_header	lreg;
 	struct squashfs_dir_inode_header	dir;
 	struct squashfs_ldir_inode_header	ldir;
 	struct squashfs_ipc_inode_header	ipc;
 	struct squashfs_lipc_inode_header	lipc;
 };

 struct squashfs_dir_entry {
 	unsigned short		offset;
 	short			inode_number;
 	unsigned short		type;
 	unsigned short		size;
 	char			name[0];
 };

 struct squashfs_dir_header {
 	unsigned int		count;
 	unsigned int		start_block;
 	unsigned int		inode_number;
 };

 struct squashfs_fragment_entry {
 	long long		start_block;
 	unsigned int		size;
 	unsigned int		unused;
 };

 struct squashfs_xattr_entry {
 	unsigned short		type;
 	unsigned short		size;
 };

 struct squashfs_xattr_val {
 	unsigned int		vsize;
 };

 struct squashfs_xattr_id {
 	long long		xattr;
 	unsigned int		count;
 	unsigned int		size;
 };

 struct squashfs_xattr_table {
 	long long		xattr_table_start;
 	unsigned int		xattr_ids;
 	unsigned int		unused;
 };

 #endif
	#ifndef SQUASHFS_FS
	#define SQUASHFS_FS
	/*
	* Squashfs
	*
	* Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012,
	* 2013, 2014
	* Phillip Lougher <phillip@squashfs.org.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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	*
	* squashfs_fs.h
	*/

	#define SQUASHFS_CACHED_FRAGMENTS CONFIG_SQUASHFS_FRAGMENT_CACHE_SIZE
	#define SQUASHFS_MAJOR 4
	#define SQUASHFS_MINOR 0
	#define SQUASHFS_MAGIC 0x73717368
	#define SQUASHFS_MAGIC_SWAP 0x68737173
	#define SQUASHFS_START 0

	/* size of metadata (inode and directory) blocks */
	#define SQUASHFS_METADATA_SIZE 8192
	#define SQUASHFS_METADATA_LOG 13

	/* default size of data blocks */
	#define SQUASHFS_FILE_SIZE 131072

	#define SQUASHFS_FILE_MAX_SIZE 1048576
	#define SQUASHFS_FILE_MAX_LOG 20

	/* Max number of uids and gids */
	#define SQUASHFS_IDS 65536

	/* Max length of filename (not 255) */
	#define SQUASHFS_NAME_LEN 256

	#define SQUASHFS_INVALID ((long long) 0xffffffffffff)
	#define SQUASHFS_INVALID_FRAG ((unsigned int) 0xffffffff)
	#define SQUASHFS_INVALID_XATTR ((unsigned int) 0xffffffff)
	#define SQUASHFS_INVALID_BLK ((long long) -1)
	#define SQUASHFS_USED_BLK ((long long) -2)

	/* Filesystem flags */
	#define SQUASHFS_NOI 0
	#define SQUASHFS_NOD 1
	#define SQUASHFS_CHECK 2
	#define SQUASHFS_NOF 3
	#define SQUASHFS_NO_FRAG 4
	#define SQUASHFS_ALWAYS_FRAG 5
	#define SQUASHFS_DUPLICATE 6
	#define SQUASHFS_EXPORT 7
	#define SQUASHFS_NOX 8
	#define SQUASHFS_NO_XATTR 9
	#define SQUASHFS_COMP_OPT 10

	#define SQUASHFS_BIT(flag, bit) ((flag >> bit) & 1)

	#define SQUASHFS_UNCOMPRESSED_INODES(flags) SQUASHFS_BIT(flags, \
	SQUASHFS_NOI)

	#define SQUASHFS_UNCOMPRESSED_DATA(flags) SQUASHFS_BIT(flags, \
	SQUASHFS_NOD)

	#define SQUASHFS_UNCOMPRESSED_FRAGMENTS(flags) SQUASHFS_BIT(flags, \
	SQUASHFS_NOF)

	#define SQUASHFS_NO_FRAGMENTS(flags) SQUASHFS_BIT(flags, \
	SQUASHFS_NO_FRAG)

	#define SQUASHFS_ALWAYS_FRAGMENTS(flags) SQUASHFS_BIT(flags, \
	SQUASHFS_ALWAYS_FRAG)

	#define SQUASHFS_DUPLICATES(flags) SQUASHFS_BIT(flags, \
	SQUASHFS_DUPLICATE)

	#define SQUASHFS_EXPORTABLE(flags) SQUASHFS_BIT(flags, \
	SQUASHFS_EXPORT)

	#define SQUASHFS_UNCOMPRESSED_XATTRS(flags) SQUASHFS_BIT(flags, \
	SQUASHFS_NOX)

	#define SQUASHFS_NO_XATTRS(flags) SQUASHFS_BIT(flags, \
	SQUASHFS_NO_XATTR)

	#define SQUASHFS_COMP_OPTS(flags) SQUASHFS_BIT(flags, \
	SQUASHFS_COMP_OPT)

	#define SQUASHFS_MKFLAGS(noi, nod, nof, nox, no_frag, always_frag, \
	duplicate_checking, exportable, no_xattr, comp_opt) (noi \| \
	(nod << 1) \| (nof << 3) \| (no_frag << 4) \| \
	(always_frag << 5) \| (duplicate_checking << 6) \| \
	(exportable << 7) \| (nox << 8) \| (no_xattr << 9) \| \
	(comp_opt << 10))

	/* Max number of types and file types */
	#define SQUASHFS_DIR_TYPE 1
	#define SQUASHFS_FILE_TYPE 2
	#define SQUASHFS_SYMLINK_TYPE 3
	#define SQUASHFS_BLKDEV_TYPE 4
	#define SQUASHFS_CHRDEV_TYPE 5
	#define SQUASHFS_FIFO_TYPE 6
	#define SQUASHFS_SOCKET_TYPE 7
	#define SQUASHFS_LDIR_TYPE 8
	#define SQUASHFS_LREG_TYPE 9
	#define SQUASHFS_LSYMLINK_TYPE 10
	#define SQUASHFS_LBLKDEV_TYPE 11
	#define SQUASHFS_LCHRDEV_TYPE 12
	#define SQUASHFS_LFIFO_TYPE 13
	#define SQUASHFS_LSOCKET_TYPE 14

	/* Xattr types */
	#define SQUASHFS_XATTR_USER 0
	#define SQUASHFS_XATTR_TRUSTED 1
	#define SQUASHFS_XATTR_SECURITY 2
	#define SQUASHFS_XATTR_VALUE_OOL 256
	#define SQUASHFS_XATTR_PREFIX_MASK 0xff

	/* Flag whether block is compressed or uncompressed, bit is set if block is
	* uncompressed */
	#define SQUASHFS_COMPRESSED_BIT (1 << 15)

	#define SQUASHFS_COMPRESSED_SIZE(B) (((B) & ~SQUASHFS_COMPRESSED_BIT) ? \
	(B) & ~SQUASHFS_COMPRESSED_BIT : SQUASHFS_COMPRESSED_BIT)

	#define SQUASHFS_COMPRESSED(B) (!((B) & SQUASHFS_COMPRESSED_BIT))

	#define SQUASHFS_COMPRESSED_BIT_BLOCK (1 << 24)

	#define SQUASHFS_COMPRESSED_SIZE_BLOCK(B) ((B) & \
	~SQUASHFS_COMPRESSED_BIT_BLOCK)

	#define SQUASHFS_COMPRESSED_BLOCK(B) (!((B) & SQUASHFS_COMPRESSED_BIT_BLOCK))

	/*
	* Inode number ops. Inodes consist of a compressed block number, and an
	* uncompressed offset within that block
	*/
	#define SQUASHFS_INODE_BLK(a) ((unsigned int) ((a) >> 16))

	#define SQUASHFS_INODE_OFFSET(a) ((unsigned int) ((a) & 0xffff))

	#define SQUASHFS_MKINODE(A, B) ((squashfs_inode)(((squashfs_inode) (A)\
	<< 16) + (B)))

	/* Compute 32 bit VFS inode number from squashfs inode number */
	#define SQUASHFS_MK_VFS_INODE(a, b) ((unsigned int) (((a) << 8) + \
	((b) >> 2) + 1))

	/* Translate between VFS mode and squashfs mode */
	#define SQUASHFS_MODE(a) ((a) & 0xfff)

	/* fragment and fragment table defines */
	#define SQUASHFS_FRAGMENT_BYTES(A) ((A) * \
	sizeof(struct squashfs_fragment_entry))

	#define SQUASHFS_FRAGMENT_INDEX(A) (SQUASHFS_FRAGMENT_BYTES(A) / \
	SQUASHFS_METADATA_SIZE)

	#define SQUASHFS_FRAGMENT_INDEX_OFFSET(A) (SQUASHFS_FRAGMENT_BYTES(A) % \
	SQUASHFS_METADATA_SIZE)

	#define SQUASHFS_FRAGMENT_INDEXES(A) ((SQUASHFS_FRAGMENT_BYTES(A) + \
	SQUASHFS_METADATA_SIZE - 1) / \
	SQUASHFS_METADATA_SIZE)

	#define SQUASHFS_FRAGMENT_INDEX_BYTES(A) (SQUASHFS_FRAGMENT_INDEXES(A) *\
	sizeof(long long))

	/* inode lookup table defines */
	#define SQUASHFS_LOOKUP_BYTES(A) ((A) * sizeof(squashfs_inode))

	#define SQUASHFS_LOOKUP_BLOCK(A) (SQUASHFS_LOOKUP_BYTES(A) / \
	SQUASHFS_METADATA_SIZE)

	#define SQUASHFS_LOOKUP_BLOCK_OFFSET(A) (SQUASHFS_LOOKUP_BYTES(A) % \
	SQUASHFS_METADATA_SIZE)

	#define SQUASHFS_LOOKUP_BLOCKS(A) ((SQUASHFS_LOOKUP_BYTES(A) + \
	SQUASHFS_METADATA_SIZE - 1) / \
	SQUASHFS_METADATA_SIZE)

	#define SQUASHFS_LOOKUP_BLOCK_BYTES(A) (SQUASHFS_LOOKUP_BLOCKS(A) *\
	sizeof(long long))

	/* uid lookup table defines */
	#define SQUASHFS_ID_BYTES(A) ((A) * sizeof(unsigned int))

	#define SQUASHFS_ID_BLOCK(A) (SQUASHFS_ID_BYTES(A) / \
	SQUASHFS_METADATA_SIZE)

	#define SQUASHFS_ID_BLOCK_OFFSET(A) (SQUASHFS_ID_BYTES(A) % \
	SQUASHFS_METADATA_SIZE)

	#define SQUASHFS_ID_BLOCKS(A) ((SQUASHFS_ID_BYTES(A) + \
	SQUASHFS_METADATA_SIZE - 1) / \
	SQUASHFS_METADATA_SIZE)

	#define SQUASHFS_ID_BLOCK_BYTES(A) (SQUASHFS_ID_BLOCKS(A) *\
	sizeof(long long))

	/* xattr id lookup table defines */
	#define SQUASHFS_XATTR_BYTES(A) ((A) * sizeof(struct squashfs_xattr_id))

	#define SQUASHFS_XATTR_BLOCK(A) (SQUASHFS_XATTR_BYTES(A) / \
	SQUASHFS_METADATA_SIZE)

	#define SQUASHFS_XATTR_BLOCK_OFFSET(A) (SQUASHFS_XATTR_BYTES(A) % \
	SQUASHFS_METADATA_SIZE)

	#define SQUASHFS_XATTR_BLOCKS(A) ((SQUASHFS_XATTR_BYTES(A) + \
	SQUASHFS_METADATA_SIZE - 1) / \
	SQUASHFS_METADATA_SIZE)

	#define SQUASHFS_XATTR_BLOCK_BYTES(A) (SQUASHFS_XATTR_BLOCKS(A) *\
	sizeof(long long))

	#define SQUASHFS_XATTR_BLK(A) ((unsigned int) ((A) >> 16))

	#define SQUASHFS_XATTR_OFFSET(A) ((unsigned int) ((A) & 0xffff))

	/* cached data constants for filesystem */
	#define SQUASHFS_CACHED_BLKS 8

	#define SQUASHFS_MAX_FILE_SIZE_LOG 64

	#define SQUASHFS_MAX_FILE_SIZE ((long long) 1 << \
	(SQUASHFS_MAX_FILE_SIZE_LOG - 2))

	#define SQUASHFS_MARKER_BYTE 0xff

	/* meta index cache */
	#define SQUASHFS_META_INDEXES (SQUASHFS_METADATA_SIZE / sizeof(unsigned int))
	#define SQUASHFS_META_ENTRIES 31
	#define SQUASHFS_META_NUMBER 8
	#define SQUASHFS_SLOTS 4

	struct meta_entry {
	long long data_block;
	unsigned int index_block;
	unsigned short offset;
	unsigned short pad;
	};

	struct meta_index {
	unsigned int inode_number;
	unsigned int offset;
	unsigned short entries;
	unsigned short skip;
	unsigned short locked;
	unsigned short pad;
	struct meta_entry meta_entry[SQUASHFS_META_ENTRIES];
	};


	/*
	* definitions for structures on disk
	*/

	typedef long long squashfs_block;
	typedef long long squashfs_inode;

	#define ZLIB_COMPRESSION 1
	#define LZMA_COMPRESSION 2
	#define LZO_COMPRESSION 3
	#define XZ_COMPRESSION 4
	#define LZ4_COMPRESSION 5

	struct squashfs_super_block {
	unsigned int s_magic;
	unsigned int inodes;
	int mkfs_time /* time of filesystem creation */;
	unsigned int block_size;
	unsigned int fragments;
	unsigned short compression;
	unsigned short block_log;
	unsigned short flags;
	unsigned short no_ids;
	unsigned short s_major;
	unsigned short s_minor;
	squashfs_inode root_inode;
	long long bytes_used;
	long long id_table_start;
	long long xattr_id_table_start;
	long long inode_table_start;
	long long directory_table_start;
	long long fragment_table_start;
	long long lookup_table_start;
	};

	struct squashfs_dir_index {
	unsigned int index;
	unsigned int start_block;
	unsigned int size;
	unsigned char name[0];
	};

	struct squashfs_base_inode_header {
	unsigned short inode_type;
	unsigned short mode;
	unsigned short uid;
	unsigned short guid;
	int mtime;
	unsigned int inode_number;
	};

	struct squashfs_ipc_inode_header {
	unsigned short inode_type;
	unsigned short mode;
	unsigned short uid;
	unsigned short guid;
	int mtime;
	unsigned int inode_number;
	unsigned int nlink;
	};

	struct squashfs_lipc_inode_header {
	unsigned short inode_type;
	unsigned short mode;
	unsigned short uid;
	unsigned short guid;
	int mtime;
	unsigned int inode_number;
	unsigned int nlink;
	unsigned int xattr;
	};

	struct squashfs_dev_inode_header {
	unsigned short inode_type;
	unsigned short mode;
	unsigned short uid;
	unsigned short guid;
	int mtime;
	unsigned int inode_number;
	unsigned int nlink;
	unsigned int rdev;
	};

	struct squashfs_ldev_inode_header {
	unsigned short inode_type;
	unsigned short mode;
	unsigned short uid;
	unsigned short guid;
	int mtime;
	unsigned int inode_number;
	unsigned int nlink;
	unsigned int rdev;
	unsigned int xattr;
	};

	struct squashfs_symlink_inode_header {
	unsigned short inode_type;
	unsigned short mode;
	unsigned short uid;
	unsigned short guid;
	int mtime;
	unsigned int inode_number;
	unsigned int nlink;
	unsigned int symlink_size;
	char symlink[0];
	};

	struct squashfs_reg_inode_header {
	unsigned short inode_type;
	unsigned short mode;
	unsigned short uid;
	unsigned short guid;
	int mtime;
	unsigned int inode_number;
	unsigned int start_block;
	unsigned int fragment;
	unsigned int offset;
	unsigned int file_size;
	unsigned int block_list[0];
	};

	struct squashfs_lreg_inode_header {
	unsigned short inode_type;
	unsigned short mode;
	unsigned short uid;
	unsigned short guid;
	int mtime;
	unsigned int inode_number;
	squashfs_block start_block;
	long long file_size;
	long long sparse;
	unsigned int nlink;
	unsigned int fragment;
	unsigned int offset;
	unsigned int xattr;
	unsigned int block_list[0];
	};

	struct squashfs_dir_inode_header {
	unsigned short inode_type;
	unsigned short mode;
	unsigned short uid;
	unsigned short guid;
	int mtime;
	unsigned int inode_number;
	unsigned int start_block;
	unsigned int nlink;
	unsigned short file_size;
	unsigned short offset;
	unsigned int parent_inode;
	};

	struct squashfs_ldir_inode_header {
	unsigned short inode_type;
	unsigned short mode;
	unsigned short uid;
	unsigned short guid;
	int mtime;
	unsigned int inode_number;
	unsigned int nlink;
	unsigned int file_size;
	unsigned int start_block;
	unsigned int parent_inode;
	unsigned short i_count;
	unsigned short offset;
	unsigned int xattr;
	struct squashfs_dir_index index[0];
	};

	union squashfs_inode_header {
	struct squashfs_base_inode_header base;
	struct squashfs_dev_inode_header dev;
	struct squashfs_ldev_inode_header ldev;
	struct squashfs_symlink_inode_header symlink;
	struct squashfs_reg_inode_header reg;
	struct squashfs_lreg_inode_header lreg;
	struct squashfs_dir_inode_header dir;
	struct squashfs_ldir_inode_header ldir;
	struct squashfs_ipc_inode_header ipc;
	struct squashfs_lipc_inode_header lipc;
	};

	struct squashfs_dir_entry {
	unsigned short offset;
	short inode_number;
	unsigned short type;
	unsigned short size;
	char name[0];
	};

	struct squashfs_dir_header {
	unsigned int count;
	unsigned int start_block;
	unsigned int inode_number;
	};

	struct squashfs_fragment_entry {
	long long start_block;
	unsigned int size;
	unsigned int unused;
	};

	struct squashfs_xattr_entry {
	unsigned short type;
	unsigned short size;
	};

	struct squashfs_xattr_val {
	unsigned int vsize;
	};

	struct squashfs_xattr_id {
	long long xattr;
	unsigned int count;
	unsigned int size;
	};

	struct squashfs_xattr_table {
	long long xattr_table_start;
	unsigned int xattr_ids;
	unsigned int unused;
	};

	#endif