[people/ms/u-boot.git] / include / cramfs / cramfs_fs.h

#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 )

#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))

/* 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 */
Commit	Line	Data
dd875c76 WD	1	#ifndef __CRAMFS_H
	2	#define __CRAMFS_H
	3
dd875c76 WD	4	#define CRAMFS_MAGIC 0x28cd3d45 /* some random number */
	5	#define CRAMFS_SIGNATURE "Compressed ROMFS"
	6
	7	/*
	8	* Width of various bitfields in struct cramfs_inode.
	9	* Primarily used to generate warnings in mkcramfs.
	10	*/
180d3f74 WD	11	#define CRAMFS_MODE_WIDTH 16
	12	#define CRAMFS_UID_WIDTH 16
	13	#define CRAMFS_SIZE_WIDTH 24
	14	#define CRAMFS_GID_WIDTH 8
	15	#define CRAMFS_NAMELEN_WIDTH 6
	16	#define CRAMFS_OFFSET_WIDTH 26
dd875c76 WD	17
	18	/*
	19	* Since inode.namelen is a unsigned 6-bit number, the maximum cramfs
	20	* path length is 63 << 2 = 252.
	21	*/
	22	#define CRAMFS_MAXPATHLEN (((1 << CRAMFS_NAMELEN_WIDTH) - 1) << 2)
	23
	24	/*
	25	* Reasonably terse representation of the inode data.
	26	*/
	27	struct cramfs_inode {
	28	u32 mode:CRAMFS_MODE_WIDTH, uid:CRAMFS_UID_WIDTH;
180d3f74	29
dd875c76 WD	30	/* SIZE for device files is i_rdev */
dd875c76 WD	31	u32 size:CRAMFS_SIZE_WIDTH, gid:CRAMFS_GID_WIDTH;
180d3f74	32
dd875c76 WD	33	/* NAMELEN is the length of the file name, divided by 4 and
	34	rounded up. (cramfs doesn't support hard links.) */
	35	/* OFFSET: For symlinks and non-empty regular files, this
	36	contains the offset (divided by 4) of the file data in
	37	compressed form (starting with an array of block pointers;
	38	see README). For non-empty directories it is the offset
	39	(divided by 4) of the inode of the first file in that
	40	directory. For anything else, offset is zero. */
	41	u32 namelen:CRAMFS_NAMELEN_WIDTH, offset:CRAMFS_OFFSET_WIDTH;
	42	};
	43
	44	struct cramfs_info {
	45	u32 crc;
	46	u32 edition;
	47	u32 blocks;
	48	u32 files;
	49	};
	50
	51	/*
	52	* Superblock information at the beginning of the FS.
	53	*/
	54	struct cramfs_super {
	55	u32 magic; /* 0x28cd3d45 - random number */
	56	u32 size; /* length in bytes */
	57	u32 flags; /* feature flags */
	58	u32 future; /* reserved for future use */
	59	u8 signature[16]; /* "Compressed ROMFS" */
	60	struct cramfs_info fsid; /* unique filesystem info */
	61	u8 name[16]; /* user-defined name */
	62	struct cramfs_inode root; /* root inode data */
	63	};
	64
	65	/*
	66	* Feature flags
	67	*
	68	* 0x00000000 - 0x000000ff: features that work for all past kernels
	69	* 0x00000100 - 0xffffffff: features that don't work for past kernels
	70	*/
	71	#define CRAMFS_FLAG_FSID_VERSION_2 0x00000001 /* fsid version #2 */
	72	#define CRAMFS_FLAG_SORTED_DIRS 0x00000002 /* sorted dirs */
	73	#define CRAMFS_FLAG_HOLES 0x00000100 /* support for holes */
	74	#define CRAMFS_FLAG_WRONG_SIGNATURE 0x00000200 /* reserved */
	75	#define CRAMFS_FLAG_SHIFTED_ROOT_OFFSET 0x00000400 /* shifted root fs */
	76
	77	/*
	78	* Valid values in super.flags. Currently we refuse to mount
	79	* if (flags & ~CRAMFS_SUPPORTED_FLAGS). Maybe that should be
	80	* changed to test super.future instead.
	81	*/
	82	#define CRAMFS_SUPPORTED_FLAGS ( 0x000000ff \
	83	\| CRAMFS_FLAG_HOLES \
	84	\| CRAMFS_FLAG_WRONG_SIGNATURE \
	85	\| CRAMFS_FLAG_SHIFTED_ROOT_OFFSET )
	86
180d3f74 WD	87	#define CRAMFS_16(x) (x)
	88	#define CRAMFS_24(x) (x)
	89	#define CRAMFS_32(x) (x)
	90	#define CRAMFS_GET_NAMELEN(x) ((x)->namelen)
	91	#define CRAMFS_GET_OFFSET(x) ((x)->offset)
	92	#define CRAMFS_SET_OFFSET(x,y) ((x)->offset = (y))
	93	#define CRAMFS_SET_NAMELEN(x,y) ((x)->namelen = (y))
180d3f74	94
dd875c76	95	/* Uncompression interfaces to the underlying zlib */
180d3f74	96	int cramfs_uncompress_block(void dst, void src, int srclen);
dd875c76 WD	97	int cramfs_uncompress_init(void);
	98	int cramfs_uncompress_exit(void);
	99
180d3f74	100	#endif /* __CRAMFS_H */