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9c06a46f15
Add support for reading file systems compressed with the LZ4 compression algorithm. This patch adds the LZ4 decompressor wrapper code. Signed-off-by: Phillip Lougher <phillip@squashfs.org.uk>
458 lines
11 KiB
C
458 lines
11 KiB
C
#ifndef SQUASHFS_FS
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#define SQUASHFS_FS
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/*
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* Squashfs
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*
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* Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008
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* Phillip Lougher <phillip@squashfs.org.uk>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2,
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* or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* squashfs_fs.h
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*/
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#define SQUASHFS_CACHED_FRAGMENTS CONFIG_SQUASHFS_FRAGMENT_CACHE_SIZE
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#define SQUASHFS_MAJOR 4
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#define SQUASHFS_MINOR 0
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#define SQUASHFS_START 0
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/* size of metadata (inode and directory) blocks */
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#define SQUASHFS_METADATA_SIZE 8192
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/* default size of block device I/O */
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#ifdef CONFIG_SQUASHFS_4K_DEVBLK_SIZE
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#define SQUASHFS_DEVBLK_SIZE 4096
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#else
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#define SQUASHFS_DEVBLK_SIZE 1024
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#endif
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#define SQUASHFS_FILE_MAX_SIZE 1048576
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#define SQUASHFS_FILE_MAX_LOG 20
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/* Max length of filename (not 255) */
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#define SQUASHFS_NAME_LEN 256
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/* Max value for directory header count*/
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#define SQUASHFS_DIR_COUNT 256
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#define SQUASHFS_INVALID_FRAG (0xffffffffU)
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#define SQUASHFS_INVALID_XATTR (0xffffffffU)
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#define SQUASHFS_INVALID_BLK (-1LL)
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/* Filesystem flags */
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#define SQUASHFS_NOI 0
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#define SQUASHFS_NOD 1
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#define SQUASHFS_NOF 3
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#define SQUASHFS_NO_FRAG 4
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#define SQUASHFS_ALWAYS_FRAG 5
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#define SQUASHFS_DUPLICATE 6
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#define SQUASHFS_EXPORT 7
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#define SQUASHFS_COMP_OPT 10
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#define SQUASHFS_BIT(flag, bit) ((flag >> bit) & 1)
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#define SQUASHFS_UNCOMPRESSED_INODES(flags) SQUASHFS_BIT(flags, \
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SQUASHFS_NOI)
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#define SQUASHFS_UNCOMPRESSED_DATA(flags) SQUASHFS_BIT(flags, \
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SQUASHFS_NOD)
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#define SQUASHFS_UNCOMPRESSED_FRAGMENTS(flags) SQUASHFS_BIT(flags, \
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SQUASHFS_NOF)
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#define SQUASHFS_NO_FRAGMENTS(flags) SQUASHFS_BIT(flags, \
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SQUASHFS_NO_FRAG)
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#define SQUASHFS_ALWAYS_FRAGMENTS(flags) SQUASHFS_BIT(flags, \
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SQUASHFS_ALWAYS_FRAG)
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#define SQUASHFS_DUPLICATES(flags) SQUASHFS_BIT(flags, \
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SQUASHFS_DUPLICATE)
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#define SQUASHFS_EXPORTABLE(flags) SQUASHFS_BIT(flags, \
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SQUASHFS_EXPORT)
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#define SQUASHFS_COMP_OPTS(flags) SQUASHFS_BIT(flags, \
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SQUASHFS_COMP_OPT)
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/* Inode types including extended types */
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#define SQUASHFS_DIR_TYPE 1
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#define SQUASHFS_REG_TYPE 2
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#define SQUASHFS_SYMLINK_TYPE 3
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#define SQUASHFS_BLKDEV_TYPE 4
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#define SQUASHFS_CHRDEV_TYPE 5
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#define SQUASHFS_FIFO_TYPE 6
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#define SQUASHFS_SOCKET_TYPE 7
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#define SQUASHFS_LDIR_TYPE 8
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#define SQUASHFS_LREG_TYPE 9
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#define SQUASHFS_LSYMLINK_TYPE 10
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#define SQUASHFS_LBLKDEV_TYPE 11
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#define SQUASHFS_LCHRDEV_TYPE 12
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#define SQUASHFS_LFIFO_TYPE 13
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#define SQUASHFS_LSOCKET_TYPE 14
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/* Max type value stored in directory entry */
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#define SQUASHFS_MAX_DIR_TYPE 7
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/* Xattr types */
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#define SQUASHFS_XATTR_USER 0
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#define SQUASHFS_XATTR_TRUSTED 1
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#define SQUASHFS_XATTR_SECURITY 2
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#define SQUASHFS_XATTR_VALUE_OOL 256
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#define SQUASHFS_XATTR_PREFIX_MASK 0xff
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/* Flag whether block is compressed or uncompressed, bit is set if block is
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* uncompressed */
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#define SQUASHFS_COMPRESSED_BIT (1 << 15)
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#define SQUASHFS_COMPRESSED_SIZE(B) (((B) & ~SQUASHFS_COMPRESSED_BIT) ? \
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(B) & ~SQUASHFS_COMPRESSED_BIT : SQUASHFS_COMPRESSED_BIT)
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#define SQUASHFS_COMPRESSED(B) (!((B) & SQUASHFS_COMPRESSED_BIT))
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#define SQUASHFS_COMPRESSED_BIT_BLOCK (1 << 24)
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#define SQUASHFS_COMPRESSED_SIZE_BLOCK(B) ((B) & \
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~SQUASHFS_COMPRESSED_BIT_BLOCK)
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#define SQUASHFS_COMPRESSED_BLOCK(B) (!((B) & SQUASHFS_COMPRESSED_BIT_BLOCK))
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/*
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* Inode number ops. Inodes consist of a compressed block number, and an
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* uncompressed offset within that block
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*/
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#define SQUASHFS_INODE_BLK(A) ((unsigned int) ((A) >> 16))
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#define SQUASHFS_INODE_OFFSET(A) ((unsigned int) ((A) & 0xffff))
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#define SQUASHFS_MKINODE(A, B) ((long long)(((long long) (A)\
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<< 16) + (B)))
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/* fragment and fragment table defines */
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#define SQUASHFS_FRAGMENT_BYTES(A) \
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((A) * sizeof(struct squashfs_fragment_entry))
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#define SQUASHFS_FRAGMENT_INDEX(A) (SQUASHFS_FRAGMENT_BYTES(A) / \
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SQUASHFS_METADATA_SIZE)
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#define SQUASHFS_FRAGMENT_INDEX_OFFSET(A) (SQUASHFS_FRAGMENT_BYTES(A) % \
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SQUASHFS_METADATA_SIZE)
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#define SQUASHFS_FRAGMENT_INDEXES(A) ((SQUASHFS_FRAGMENT_BYTES(A) + \
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SQUASHFS_METADATA_SIZE - 1) / \
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SQUASHFS_METADATA_SIZE)
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#define SQUASHFS_FRAGMENT_INDEX_BYTES(A) (SQUASHFS_FRAGMENT_INDEXES(A) *\
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sizeof(u64))
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/* inode lookup table defines */
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#define SQUASHFS_LOOKUP_BYTES(A) ((A) * sizeof(u64))
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#define SQUASHFS_LOOKUP_BLOCK(A) (SQUASHFS_LOOKUP_BYTES(A) / \
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SQUASHFS_METADATA_SIZE)
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#define SQUASHFS_LOOKUP_BLOCK_OFFSET(A) (SQUASHFS_LOOKUP_BYTES(A) % \
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SQUASHFS_METADATA_SIZE)
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#define SQUASHFS_LOOKUP_BLOCKS(A) ((SQUASHFS_LOOKUP_BYTES(A) + \
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SQUASHFS_METADATA_SIZE - 1) / \
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SQUASHFS_METADATA_SIZE)
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#define SQUASHFS_LOOKUP_BLOCK_BYTES(A) (SQUASHFS_LOOKUP_BLOCKS(A) *\
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sizeof(u64))
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/* uid/gid lookup table defines */
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#define SQUASHFS_ID_BYTES(A) ((A) * sizeof(unsigned int))
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#define SQUASHFS_ID_BLOCK(A) (SQUASHFS_ID_BYTES(A) / \
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SQUASHFS_METADATA_SIZE)
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#define SQUASHFS_ID_BLOCK_OFFSET(A) (SQUASHFS_ID_BYTES(A) % \
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SQUASHFS_METADATA_SIZE)
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#define SQUASHFS_ID_BLOCKS(A) ((SQUASHFS_ID_BYTES(A) + \
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SQUASHFS_METADATA_SIZE - 1) / \
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SQUASHFS_METADATA_SIZE)
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#define SQUASHFS_ID_BLOCK_BYTES(A) (SQUASHFS_ID_BLOCKS(A) *\
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sizeof(u64))
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/* xattr id lookup table defines */
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#define SQUASHFS_XATTR_BYTES(A) ((A) * sizeof(struct squashfs_xattr_id))
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#define SQUASHFS_XATTR_BLOCK(A) (SQUASHFS_XATTR_BYTES(A) / \
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SQUASHFS_METADATA_SIZE)
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#define SQUASHFS_XATTR_BLOCK_OFFSET(A) (SQUASHFS_XATTR_BYTES(A) % \
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SQUASHFS_METADATA_SIZE)
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#define SQUASHFS_XATTR_BLOCKS(A) ((SQUASHFS_XATTR_BYTES(A) + \
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SQUASHFS_METADATA_SIZE - 1) / \
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SQUASHFS_METADATA_SIZE)
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#define SQUASHFS_XATTR_BLOCK_BYTES(A) (SQUASHFS_XATTR_BLOCKS(A) *\
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sizeof(u64))
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#define SQUASHFS_XATTR_BLK(A) ((unsigned int) ((A) >> 16))
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#define SQUASHFS_XATTR_OFFSET(A) ((unsigned int) ((A) & 0xffff))
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/* cached data constants for filesystem */
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#define SQUASHFS_CACHED_BLKS 8
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/* meta index cache */
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#define SQUASHFS_META_INDEXES (SQUASHFS_METADATA_SIZE / sizeof(unsigned int))
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#define SQUASHFS_META_ENTRIES 127
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#define SQUASHFS_META_SLOTS 8
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struct meta_entry {
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u64 data_block;
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unsigned int index_block;
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unsigned short offset;
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unsigned short pad;
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};
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struct meta_index {
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unsigned int inode_number;
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unsigned int offset;
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unsigned short entries;
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unsigned short skip;
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unsigned short locked;
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unsigned short pad;
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struct meta_entry meta_entry[SQUASHFS_META_ENTRIES];
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};
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/*
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* definitions for structures on disk
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*/
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#define ZLIB_COMPRESSION 1
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#define LZMA_COMPRESSION 2
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#define LZO_COMPRESSION 3
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#define XZ_COMPRESSION 4
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#define LZ4_COMPRESSION 5
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struct squashfs_super_block {
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__le32 s_magic;
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__le32 inodes;
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__le32 mkfs_time;
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__le32 block_size;
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__le32 fragments;
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__le16 compression;
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__le16 block_log;
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__le16 flags;
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__le16 no_ids;
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__le16 s_major;
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__le16 s_minor;
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__le64 root_inode;
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__le64 bytes_used;
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__le64 id_table_start;
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__le64 xattr_id_table_start;
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__le64 inode_table_start;
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__le64 directory_table_start;
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__le64 fragment_table_start;
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__le64 lookup_table_start;
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};
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struct squashfs_dir_index {
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__le32 index;
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__le32 start_block;
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__le32 size;
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unsigned char name[0];
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};
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struct squashfs_base_inode {
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__le16 inode_type;
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__le16 mode;
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__le16 uid;
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__le16 guid;
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__le32 mtime;
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__le32 inode_number;
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};
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struct squashfs_ipc_inode {
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__le16 inode_type;
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__le16 mode;
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__le16 uid;
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__le16 guid;
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__le32 mtime;
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__le32 inode_number;
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__le32 nlink;
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};
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struct squashfs_lipc_inode {
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__le16 inode_type;
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__le16 mode;
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__le16 uid;
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__le16 guid;
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__le32 mtime;
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__le32 inode_number;
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__le32 nlink;
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__le32 xattr;
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};
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struct squashfs_dev_inode {
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__le16 inode_type;
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__le16 mode;
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__le16 uid;
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__le16 guid;
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__le32 mtime;
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__le32 inode_number;
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__le32 nlink;
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__le32 rdev;
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};
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struct squashfs_ldev_inode {
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__le16 inode_type;
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__le16 mode;
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__le16 uid;
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__le16 guid;
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__le32 mtime;
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__le32 inode_number;
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__le32 nlink;
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__le32 rdev;
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__le32 xattr;
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};
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struct squashfs_symlink_inode {
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__le16 inode_type;
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__le16 mode;
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__le16 uid;
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__le16 guid;
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__le32 mtime;
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__le32 inode_number;
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__le32 nlink;
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__le32 symlink_size;
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char symlink[0];
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};
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struct squashfs_reg_inode {
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__le16 inode_type;
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__le16 mode;
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__le16 uid;
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__le16 guid;
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__le32 mtime;
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__le32 inode_number;
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__le32 start_block;
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__le32 fragment;
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__le32 offset;
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__le32 file_size;
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__le16 block_list[0];
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};
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struct squashfs_lreg_inode {
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__le16 inode_type;
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__le16 mode;
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__le16 uid;
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__le16 guid;
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__le32 mtime;
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__le32 inode_number;
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__le64 start_block;
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__le64 file_size;
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__le64 sparse;
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__le32 nlink;
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__le32 fragment;
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__le32 offset;
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__le32 xattr;
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__le16 block_list[0];
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};
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struct squashfs_dir_inode {
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__le16 inode_type;
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__le16 mode;
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__le16 uid;
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__le16 guid;
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__le32 mtime;
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__le32 inode_number;
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__le32 start_block;
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__le32 nlink;
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__le16 file_size;
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__le16 offset;
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__le32 parent_inode;
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};
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struct squashfs_ldir_inode {
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__le16 inode_type;
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__le16 mode;
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__le16 uid;
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__le16 guid;
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__le32 mtime;
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__le32 inode_number;
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__le32 nlink;
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__le32 file_size;
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__le32 start_block;
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__le32 parent_inode;
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__le16 i_count;
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__le16 offset;
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__le32 xattr;
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struct squashfs_dir_index index[0];
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};
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union squashfs_inode {
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struct squashfs_base_inode base;
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struct squashfs_dev_inode dev;
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struct squashfs_ldev_inode ldev;
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struct squashfs_symlink_inode symlink;
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struct squashfs_reg_inode reg;
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struct squashfs_lreg_inode lreg;
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struct squashfs_dir_inode dir;
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struct squashfs_ldir_inode ldir;
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struct squashfs_ipc_inode ipc;
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struct squashfs_lipc_inode lipc;
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};
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struct squashfs_dir_entry {
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__le16 offset;
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__le16 inode_number;
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__le16 type;
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__le16 size;
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char name[0];
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};
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struct squashfs_dir_header {
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__le32 count;
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__le32 start_block;
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__le32 inode_number;
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};
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struct squashfs_fragment_entry {
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__le64 start_block;
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__le32 size;
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unsigned int unused;
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};
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struct squashfs_xattr_entry {
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__le16 type;
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__le16 size;
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char data[0];
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};
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struct squashfs_xattr_val {
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__le32 vsize;
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char value[0];
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};
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struct squashfs_xattr_id {
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__le64 xattr;
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__le32 count;
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__le32 size;
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};
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struct squashfs_xattr_id_table {
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__le64 xattr_table_start;
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__le32 xattr_ids;
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__le32 unused;
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};
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#endif
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