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/*
* squashfs_fs.h
*
* Copyright (c) 2012 Phillip Lougher <phillip@squashfs.org.uk>
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef SQUASHFS_FS
#define SQUASHFS_FS
#ifdef HAVE_LINUX_TYPES_LE16
#include <linux/types.h>
#else
#include <stdint.h>
typedef uint16_t __le16;
typedef uint32_t __le32;
typedef uint64_t __le64;
#endif
#define SQUASHFS_MAGIC 0x73717368
#define SQUASHFS_CACHED_FRAGMENTS CONFIG_SQUASHFS_FRAGMENT_CACHE_SIZE
#define SQUASHFS_MAJOR 4
#define SQUASHFS_MINOR 0
#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_LOG 17
#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_FRAG (0xffffffffU)
#define SQUASHFS_INVALID_XATTR (0xffffffffU)
#define SQUASHFS_INVALID_BLK ((int64_t)-1)
/* Filesystem flags */
#define SQUASHFS_NOI 0
#define SQUASHFS_NOD 1
#define SQUASHFS_NOF 3
#define SQUASHFS_NO_FRAG 4
#define SQUASHFS_ALWAYS_FRAG 5
#define SQUASHFS_DUPLICATE 6
#define SQUASHFS_EXPORT 7
#define SQUASHFS_COMP_OPT 10
/* Max number of types and file types */
#define SQUASHFS_DIR_TYPE 1
#define SQUASHFS_REG_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
#define SQUASHFS_COMPRESSED_BIT (1 << 15)
#define SQUASHFS_COMPRESSED_BIT_BLOCK (1 << 24)
/* cached data constants for filesystem */
#ifdef SQFS_MULTITHREADED
# define SQUASHFS_CACHED_BLKS 128
#else
# define SQUASHFS_CACHED_BLKS 8
#endif
#define SQUASHFS_MAX_FILE_SIZE_LOG 64
#define SQUASHFS_MAX_FILE_SIZE (1LL << \
(SQUASHFS_MAX_FILE_SIZE_LOG - 2))
/* meta index cache */
#define SQUASHFS_META_INDEXES (SQUASHFS_METADATA_SIZE / sizeof(unsigned int))
#define SQUASHFS_META_ENTRIES 127
#define SQUASHFS_META_SLOTS 8
/*
* definitions for structures on disk
*/
#define ZLIB_COMPRESSION 1
#define LZMA_COMPRESSION 2
#define LZO_COMPRESSION 3
#define XZ_COMPRESSION 4
#define LZ4_COMPRESSION 5
#define ZSTD_COMPRESSION 6
struct squashfs_super_block {
__le32 s_magic;
__le32 inodes;
__le32 mkfs_time;
__le32 block_size;
__le32 fragments;
__le16 compression;
__le16 block_log;
__le16 flags;
__le16 no_ids;
__le16 s_major;
__le16 s_minor;
__le64 root_inode;
__le64 bytes_used;
__le64 id_table_start;
__le64 xattr_id_table_start;
__le64 inode_table_start;
__le64 directory_table_start;
__le64 fragment_table_start;
__le64 lookup_table_start;
};
struct squashfs_dir_index {
__le32 index;
__le32 start_block;
__le32 size;
};
struct squashfs_base_inode {
__le16 inode_type;
__le16 mode;
__le16 uid;
__le16 guid;
__le32 mtime;
__le32 inode_number;
};
struct squashfs_ipc_inode {
__le16 inode_type;
__le16 mode;
__le16 uid;
__le16 guid;
__le32 mtime;
__le32 inode_number;
__le32 nlink;
};
struct squashfs_lipc_inode {
__le16 inode_type;
__le16 mode;
__le16 uid;
__le16 guid;
__le32 mtime;
__le32 inode_number;
__le32 nlink;
__le32 xattr;
};
struct squashfs_dev_inode {
__le16 inode_type;
__le16 mode;
__le16 uid;
__le16 guid;
__le32 mtime;
__le32 inode_number;
__le32 nlink;
__le32 rdev;
};
struct squashfs_ldev_inode {
__le16 inode_type;
__le16 mode;
__le16 uid;
__le16 guid;
__le32 mtime;
__le32 inode_number;
__le32 nlink;
__le32 rdev;
__le32 xattr;
};
struct squashfs_symlink_inode {
__le16 inode_type;
__le16 mode;
__le16 uid;
__le16 guid;
__le32 mtime;
__le32 inode_number;
__le32 nlink;
__le32 symlink_size;
};
struct squashfs_reg_inode {
__le16 inode_type;
__le16 mode;
__le16 uid;
__le16 guid;
__le32 mtime;
__le32 inode_number;
__le32 start_block;
__le32 fragment;
__le32 offset;
__le32 file_size;
};
struct squashfs_lreg_inode {
__le16 inode_type;
__le16 mode;
__le16 uid;
__le16 guid;
__le32 mtime;
__le32 inode_number;
__le64 start_block;
__le64 file_size;
__le64 sparse;
__le32 nlink;
__le32 fragment;
__le32 offset;
__le32 xattr;
};
struct squashfs_dir_inode {
__le16 inode_type;
__le16 mode;
__le16 uid;
__le16 guid;
__le32 mtime;
__le32 inode_number;
__le32 start_block;
__le32 nlink;
__le16 file_size;
__le16 offset;
__le32 parent_inode;
};
struct squashfs_ldir_inode {
__le16 inode_type;
__le16 mode;
__le16 uid;
__le16 guid;
__le32 mtime;
__le32 inode_number;
__le32 nlink;
__le32 file_size;
__le32 start_block;
__le32 parent_inode;
__le16 i_count;
__le16 offset;
__le32 xattr;
};
struct squashfs_dir_entry {
__le16 offset;
__le16 inode_number;
__le16 type;
__le16 size;
};
struct squashfs_dir_header {
__le32 count;
__le32 start_block;
__le32 inode_number;
};
struct squashfs_fragment_entry {
__le64 start_block;
__le32 size;
unsigned int unused;
};
struct squashfs_xattr_entry {
__le16 type;
__le16 size;
};
struct squashfs_xattr_val {
__le32 vsize;
};
struct squashfs_xattr_id {
__le64 xattr;
__le32 count;
__le32 size;
};
struct squashfs_xattr_id_table {
__le64 xattr_table_start;
__le32 xattr_ids;
__le32 unused;
};
#endif
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