#ifndef __CRAMFS_H
  #define __CRAMFS_H

  #include <linux/types.h>

  #include <linux/magic.h>

  #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 )

  #ifdef __KERNEL__

  /* Uncompression interfaces to the underlying zlib */
  int cramfs_uncompress_block(void *dst, int dstlen, void *src, int srclen);
  int cramfs_uncompress_init(void);

  void cramfs_uncompress_exit(void);

  #endif /* __KERNEL__ */

  
  #endif