#ifndef __CRAMFS_H#define __CRAMFS_H#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 )#if __BYTE_ORDER == __LITTLE_ENDIAN#define CRAMFS_16(x)	(x)#define CRAMFS_24(x)	(x)#define CRAMFS_32(x)	(x)#define CRAMFS_GET_NAMELEN(x)	((x)->namelen)#define CRAMFS_GET_OFFSET(x)	((x)->offset)#define CRAMFS_SET_OFFSET(x,y)	((x)->offset = (y))#define CRAMFS_SET_NAMELEN(x,y) ((x)->namelen = (y))#elif __BYTE_ORDER == __BIG_ENDIAN#ifdef __KERNEL__#define CRAMFS_16(x)	swab16(x)#define CRAMFS_24(x)	((swab32(x)) >> 8)#define CRAMFS_32(x)	swab32(x)#else /* not __KERNEL__ */#define CRAMFS_16(x)	bswap_16(x)#define CRAMFS_24(x)	((bswap_32(x)) >> 8)#define CRAMFS_32(x)	bswap_32(x)#endif /* not __KERNEL__ */#define CRAMFS_GET_NAMELEN(x)	(((u8*)(x))[8] & 0x3f)#define CRAMFS_GET_OFFSET(x)	((CRAMFS_24(((u32*)(x))[2] & 0xffffff) << 2) |\				 ((((u32*)(x))[2] & 0xc0000000) >> 30))#define CRAMFS_SET_NAMELEN(x,y)	(((u8*)(x))[8] = (((0x3f & (y))) | \						  (0xc0 & ((u8*)(x))[8])))#define CRAMFS_SET_OFFSET(x,y)	(((u32*)(x))[2] = (((y) & 3) << 30) | \				 CRAMFS_24((((y) & 0x03ffffff) >> 2)) | \				 (((u32)(((u8*)(x))[8] & 0x3f)) << 24))#else#error "__BYTE_ORDER must be __LITTLE_ENDIAN or __BIG_ENDIAN"#endif/* Uncompression interfaces to the underlying zlib */int cramfs_uncompress_block(void *dst, void *src, int srclen);int cramfs_uncompress_init(void);int cramfs_uncompress_exit(void);#endif	/* __CRAMFS_H */