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/*
File: cramfs.h
Copyright (C) 2004-2006 Christophe GRENIER <grenier@cgsecurity.org>
This software is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write the Free Software Foundation, Inc., 51
Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef _CRAMFS_H
#define _CRAMFS_H
#ifdef __cplusplus
extern "C" {
#endif
/* real size is 76 */
#define CRAMFS_SUPERBLOCK_SIZE 512
#define CRAMFS_MAGIC 0x28cd3d45 /* some random number */
#define CRAMFS_SIGNATURE "Compressed ROMFS"
struct cramfs_info {
uint32_t crc;
uint32_t edition;
uint32_t blocks;
uint32_t files;
};
/*
* 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 {
uint32_t mode:CRAMFS_MODE_WIDTH, uid:CRAMFS_UID_WIDTH;
/* SIZE for device files is i_rdev */
uint32_t 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. */
uint32_t namelen:CRAMFS_NAMELEN_WIDTH, offset:CRAMFS_OFFSET_WIDTH;
};
struct cramfs_super {
uint32_t magic; /* 0x28cd3d45 - random number */
uint32_t size; /* length in bytes */
uint32_t flags; /* feature flags */
uint32_t future; /* reserved for future use */
uint8_t signature[16]; /* "Compressed ROMFS" */
struct cramfs_info fsid; /* unique filesystem info */
uint8_t name[16]; /* user-defined name */
struct cramfs_inode root; /* root inode data */
};
/*@
@ requires \valid(disk_car);
@ requires valid_disk(disk_car);
@ requires \valid(partition);
@ requires \separated(disk_car, partition);
@ decreases 0;
@*/
int check_cramfs(disk_t *disk_car,partition_t *partition,const int verbose);
/*@
@ requires \valid(disk_car);
@ requires valid_disk(disk_car);
@ requires \valid(partition);
@ requires \separated(disk_car, partition, sb);
@ requires \valid_read(sb);
@*/
int recover_cramfs(const disk_t *disk_car, const struct cramfs_super *sb, partition_t *partition, const int verbose, const int dump_ind);
#ifdef __cplusplus
} /* closing brace for extern "C" */
#endif
#endif
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