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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 422 | giacomo | 1 | #ifndef __CRAMFS_H |
| 2 | #define __CRAMFS_H |
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| 3 | |||
| 4 | #ifndef __KERNEL__ |
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| 5 | |||
| 6 | typedef unsigned char u8; |
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| 7 | typedef unsigned short u16; |
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| 8 | typedef unsigned int u32; |
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| 9 | |||
| 10 | #endif |
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| 11 | |||
| 12 | #define CRAMFS_MAGIC 0x28cd3d45 /* some random number */ |
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| 13 | #define CRAMFS_SIGNATURE "Compressed ROMFS" |
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| 14 | |||
| 15 | /* |
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| 16 | * Width of various bitfields in struct cramfs_inode. |
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| 17 | * Primarily used to generate warnings in mkcramfs. |
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| 18 | */ |
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| 19 | #define CRAMFS_MODE_WIDTH 16 |
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| 20 | #define CRAMFS_UID_WIDTH 16 |
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| 21 | #define CRAMFS_SIZE_WIDTH 24 |
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| 22 | #define CRAMFS_GID_WIDTH 8 |
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| 23 | #define CRAMFS_NAMELEN_WIDTH 6 |
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| 24 | #define CRAMFS_OFFSET_WIDTH 26 |
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| 25 | |||
| 26 | /* |
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| 27 | * Since inode.namelen is a unsigned 6-bit number, the maximum cramfs |
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| 28 | * path length is 63 << 2 = 252. |
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| 29 | */ |
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| 30 | #define CRAMFS_MAXPATHLEN (((1 << CRAMFS_NAMELEN_WIDTH) - 1) << 2) |
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| 31 | |||
| 32 | /* |
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| 33 | * Reasonably terse representation of the inode data. |
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| 34 | */ |
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| 35 | struct cramfs_inode { |
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| 36 | u32 mode:CRAMFS_MODE_WIDTH, uid:CRAMFS_UID_WIDTH; |
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| 37 | /* SIZE for device files is i_rdev */ |
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| 38 | u32 size:CRAMFS_SIZE_WIDTH, gid:CRAMFS_GID_WIDTH; |
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| 39 | /* NAMELEN is the length of the file name, divided by 4 and |
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| 40 | rounded up. (cramfs doesn't support hard links.) */ |
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| 41 | /* OFFSET: For symlinks and non-empty regular files, this |
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| 42 | contains the offset (divided by 4) of the file data in |
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| 43 | compressed form (starting with an array of block pointers; |
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| 44 | see README). For non-empty directories it is the offset |
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| 45 | (divided by 4) of the inode of the first file in that |
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| 46 | directory. For anything else, offset is zero. */ |
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| 47 | u32 namelen:CRAMFS_NAMELEN_WIDTH, offset:CRAMFS_OFFSET_WIDTH; |
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| 48 | }; |
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| 49 | |||
| 50 | struct cramfs_info { |
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| 51 | u32 crc; |
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| 52 | u32 edition; |
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| 53 | u32 blocks; |
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| 54 | u32 files; |
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| 55 | }; |
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| 56 | |||
| 57 | /* |
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| 58 | * Superblock information at the beginning of the FS. |
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| 59 | */ |
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| 60 | struct cramfs_super { |
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| 61 | u32 magic; /* 0x28cd3d45 - random number */ |
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| 62 | u32 size; /* length in bytes */ |
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| 63 | u32 flags; /* feature flags */ |
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| 64 | u32 future; /* reserved for future use */ |
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| 65 | u8 signature[16]; /* "Compressed ROMFS" */ |
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| 66 | struct cramfs_info fsid; /* unique filesystem info */ |
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| 67 | u8 name[16]; /* user-defined name */ |
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| 68 | struct cramfs_inode root; /* root inode data */ |
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| 69 | }; |
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| 70 | |||
| 71 | /* |
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| 72 | * Feature flags |
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| 73 | * |
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| 74 | * 0x00000000 - 0x000000ff: features that work for all past kernels |
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| 75 | * 0x00000100 - 0xffffffff: features that don't work for past kernels |
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| 76 | */ |
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| 77 | #define CRAMFS_FLAG_FSID_VERSION_2 0x00000001 /* fsid version #2 */ |
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| 78 | #define CRAMFS_FLAG_SORTED_DIRS 0x00000002 /* sorted dirs */ |
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| 79 | #define CRAMFS_FLAG_HOLES 0x00000100 /* support for holes */ |
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| 80 | #define CRAMFS_FLAG_WRONG_SIGNATURE 0x00000200 /* reserved */ |
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| 81 | #define CRAMFS_FLAG_SHIFTED_ROOT_OFFSET 0x00000400 /* shifted root fs */ |
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| 82 | |||
| 83 | /* |
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| 84 | * Valid values in super.flags. Currently we refuse to mount |
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| 85 | * if (flags & ~CRAMFS_SUPPORTED_FLAGS). Maybe that should be |
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| 86 | * changed to test super.future instead. |
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| 87 | */ |
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| 88 | #define CRAMFS_SUPPORTED_FLAGS ( 0x000000ff \ |
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| 89 | | CRAMFS_FLAG_HOLES \ |
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| 90 | | CRAMFS_FLAG_WRONG_SIGNATURE \ |
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| 91 | | CRAMFS_FLAG_SHIFTED_ROOT_OFFSET ) |
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| 92 | |||
| 93 | /* Uncompression interfaces to the underlying zlib */ |
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| 94 | int cramfs_uncompress_block(void *dst, int dstlen, void *src, int srclen); |
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| 95 | int cramfs_uncompress_init(void); |
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| 96 | int cramfs_uncompress_exit(void); |
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| 97 | |||
| 98 | #endif |