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452 lines
10 KiB
452 lines
10 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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#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 <[email protected]> |
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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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#define SQUASHFS_BLOCK_OFFSET 2 |
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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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static inline int squashfs_block_size(__le32 raw) |
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{ |
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u32 size = le32_to_cpu(raw); |
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return (size >> 25) ? -EIO : size; |
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} |
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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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#define ZSTD_COMPRESSION 6 |
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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[]; |
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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[]; |
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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[]; |
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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[]; |
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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[]; |
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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[]; |
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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[]; |
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}; |
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struct squashfs_xattr_val { |
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__le32 vsize; |
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char value[]; |
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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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