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#ifndef __CRAMFS_H #define __CRAMFS_H #ifndef __KERNEL__ typedef unsigned char u8; typedef unsigned short u16; typedef unsigned int u32; #endif #define CRAMFS_MAGIC 0x28cd3d45 /* some random number */ #define CRAMFS_SIGNATURE "Compressed ROMFS" /* * Width of various bitfields in struct cramfs_inode. * Primarily used to generate warnings in mkcramfs. */ #define CRAMFS_MODE_WIDTH 16 #define CRAMFS_UID_WIDTH 16 #define CRAMFS_SIZE_WIDTH 24 #define CRAMFS_GID_WIDTH 8 #define CRAMFS_NAMELEN_WIDTH 6 #define CRAMFS_OFFSET_WIDTH 26 /* * Since inode.namelen is a unsigned 6-bit number, the maximum cramfs * path length is 63 << 2 = 252. */ #define CRAMFS_MAXPATHLEN (((1 << CRAMFS_NAMELEN_WIDTH) - 1) << 2) /* * Reasonably terse representation of the inode data. */ struct cramfs_inode { u32 mode:CRAMFS_MODE_WIDTH, uid:CRAMFS_UID_WIDTH; /* SIZE for device files is i_rdev */ u32 size:CRAMFS_SIZE_WIDTH, gid:CRAMFS_GID_WIDTH; /* NAMELEN is the length of the file name, divided by 4 and rounded up. (cramfs doesn't support hard links.) */ /* OFFSET: For symlinks and non-empty regular files, this contains the offset (divided by 4) of the file data in compressed form (starting with an array of block pointers; see README). For non-empty directories it is the offset (divided by 4) of the inode of the first file in that directory. For anything else, offset is zero. */ u32 namelen:CRAMFS_NAMELEN_WIDTH, offset:CRAMFS_OFFSET_WIDTH; }; struct cramfs_info { u32 crc; u32 edition; u32 blocks; u32 files; }; /* * Superblock information at the beginning of the FS. */ struct cramfs_super { u32 magic; /* 0x28cd3d45 - random number */ u32 size; /* length in bytes */ u32 flags; /* feature flags */ u32 future; /* reserved for future use */ u8 signature[16]; /* "Compressed ROMFS" */ struct cramfs_info fsid; /* unique filesystem info */ u8 name[16]; /* user-defined name */ struct cramfs_inode root; /* root inode data */ }; /* * Feature flags * * 0x00000000 - 0x000000ff: features that work for all past kernels * 0x00000100 - 0xffffffff: features that don't work for past kernels */ #define CRAMFS_FLAG_FSID_VERSION_2 0x00000001 /* fsid version #2 */ #define CRAMFS_FLAG_SORTED_DIRS 0x00000002 /* sorted dirs */ #define CRAMFS_FLAG_HOLES 0x00000100 /* support for holes */ #define CRAMFS_FLAG_WRONG_SIGNATURE 0x00000200 /* reserved */ #define CRAMFS_FLAG_SHIFTED_ROOT_OFFSET 0x00000400 /* shifted root fs */ /* * Valid values in super.flags. Currently we refuse to mount * if (flags & ~CRAMFS_SUPPORTED_FLAGS). Maybe that should be * changed to test super.future instead. */ #define CRAMFS_SUPPORTED_FLAGS ( 0x000000ff \ | CRAMFS_FLAG_HOLES \ | CRAMFS_FLAG_WRONG_SIGNATURE \ | CRAMFS_FLAG_SHIFTED_ROOT_OFFSET ) /* Uncompression interfaces to the underlying zlib */ int cramfs_uncompress_block(void *dst, int dstlen, void *src, int srclen); int cramfs_uncompress_init(void); int cramfs_uncompress_exit(void); #endif