mirror of
https://github.com/ventoy/Ventoy.git
synced 2024-12-30 17:13:24 -05:00
500 lines
13 KiB
C
500 lines
13 KiB
C
#ifndef SQUASHFS_FS
|
|
#define SQUASHFS_FS
|
|
/*
|
|
* Squashfs
|
|
*
|
|
* Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012,
|
|
* 2013, 2014, 2017, 2019
|
|
* 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
|
|
|
|
/* Max value for directory header count */
|
|
#define SQUASHFS_DIR_COUNT 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_NOID 11
|
|
|
|
#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_UNCOMPRESSED_IDS(flags) SQUASHFS_BIT(flags, \
|
|
SQUASHFS_NOID)
|
|
|
|
#define SQUASHFS_MKFLAGS(noi, nod, nof, nox, noid, 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) | (noid << 11))
|
|
|
|
/* 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
|
|
#define ZSTD_COMPRESSION 6
|
|
|
|
struct squashfs_super_block {
|
|
unsigned int s_magic;
|
|
unsigned int inodes;
|
|
unsigned 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;
|
|
unsigned int mtime;
|
|
unsigned int inode_number;
|
|
};
|
|
|
|
struct squashfs_ipc_inode_header {
|
|
unsigned short inode_type;
|
|
unsigned short mode;
|
|
unsigned short uid;
|
|
unsigned short guid;
|
|
unsigned 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;
|
|
unsigned 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;
|
|
unsigned 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;
|
|
unsigned 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;
|
|
unsigned 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;
|
|
unsigned 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;
|
|
unsigned 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;
|
|
unsigned 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;
|
|
unsigned 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
|