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