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#ifndef __CRAMFS_H
#define __CRAMFS_H
#define CRAMFS_MAGIC 0x28cd3d45 /* some random number */
#define CRAMFS_SIGNATURE "Compressed ROMFS"
/*
* Reasonably terse representation of the inode data.
*/
struct cramfs_inode {
u32 mode:16, uid:16;
/* SIZE for device files is i_rdev */
u32 size:24, gid:8;
/* 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:6, offset:26;
};
/*
* Superblock information at the beginning of the FS.
*/
struct cramfs_super {
u32 magic; /* 0x28cd3d45 - random number */
u32 size; /* Not used. mkcramfs currently
writes a constant 1<<16 here. */
u32 flags; /* 0 */
u32 future; /* 0 */
u8 signature[16]; /* "Compressed ROMFS" */
u8 fsid[16]; /* random number */
u8 name[16]; /* user-defined name */
struct cramfs_inode root; /* Root inode data */
};
/*
* 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 (0xff)
/* 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
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