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/*

    File: ext2.h

    Copyright (C) 1998-2004,2006 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.

 */
#ifdef __cplusplus
extern "C" {
#endif

#define EXT2_SUPERBLOCK_SIZE 1024

#define EXT2_SB(sb)     (sb)

/*
 * The second extended file system magic number
 */
#define EXT2_SUPER_MAGIC	0xEF53
#define EXT2_MIN_BLOCK_SIZE		1024
#define	EXT2_MAX_BLOCK_SIZE		4096
#define EXT2_MIN_BLOCK_LOG_SIZE		  10

#define EXT2_MIN_BLOCK (EXT2_MIN_BLOCK_SIZE/DEFAULT_SECTOR_SIZE)

/*
 * File system states
 */
#define	EXT2_VALID_FS			0x0001	/* Unmounted cleanly */
#define	EXT2_ERROR_FS			0x0002	/* Errors detected */

/*
 * Behaviour when detecting errors
 */
#define EXT2_ERRORS_CONTINUE		1	/* Continue execution */
#define EXT2_ERRORS_RO			2	/* Remount fs read-only */
#define EXT2_ERRORS_PANIC		3	/* Panic */
#define EXT2_ERRORS_DEFAULT		EXT2_ERRORS_CONTINUE

/*
 * Feature set definitions
 */
#define EXT2_HAS_COMPAT_FEATURE(sb,mask)                        \
        ( le32(EXT2_SB(sb)->s_feature_compat) & (mask) )
#define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask)                     \
        ( le32(EXT2_SB(sb)->s_feature_ro_compat) & (mask) )
#define EXT2_HAS_INCOMPAT_FEATURE(sb,mask)                      \
        ( le32(EXT2_SB(sb)->s_feature_incompat) & (mask) )

#define EXT2_FEATURE_COMPAT_DIR_PREALLOC        0x0001
#define EXT2_FEATURE_COMPAT_IMAGIC_INODES	0x0002
#define EXT3_FEATURE_COMPAT_HAS_JOURNAL		0x0004
#define EXT2_FEATURE_COMPAT_EXT_ATTR		0x0008
#define EXT2_FEATURE_COMPAT_RESIZE_INO		0x0010
#define EXT2_FEATURE_COMPAT_DIR_INDEX		0x0020
#define EXT2_FEATURE_COMPAT_LAZY_BG		0x0040
#define EXT2_FEATURE_COMPAT_ANY			0xffffffff


#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
//#define EXT2_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE	0x0008
#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM		0x0010
#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK	0x0020
#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE	0x0040
#define EXT2_FEATURE_RO_COMPAT_ANY		0xffffffff

#define EXT2_FEATURE_INCOMPAT_COMPRESSION       0x0001
#define EXT2_FEATURE_INCOMPAT_FILETYPE          0x0002
#define EXT3_FEATURE_INCOMPAT_RECOVER		0x0004
#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV	0x0008
#define EXT2_FEATURE_INCOMPAT_META_BG		0x0010
#define EXT3_FEATURE_INCOMPAT_EXTENTS		0x0040
#define EXT4_FEATURE_INCOMPAT_64BIT		0x0080
#define EXT4_FEATURE_INCOMPAT_MMP		0x0100
#define EXT2_FEATURE_INCOMPAT_ANY		0xffffffff
                                                    
/*
 * Structure of the super block
 */
struct ext2_super_block {
	uint32_t	s_inodes_count;		/* Inodes count */
	uint32_t	s_blocks_count;		/* Blocks count */
	uint32_t	s_r_blocks_count;	/* Reserved blocks count */
	uint32_t	s_free_blocks_count;	/* Free blocks count */
	uint32_t	s_free_inodes_count;	/* Free inodes count */
	uint32_t	s_first_data_block;	/* First Data Block */
	uint32_t	s_log_block_size;	/* Block size */
	int32_t	s_log_frag_size;	/* Fragment size */
	uint32_t	s_blocks_per_group;	/* # Blocks per group */
	uint32_t	s_frags_per_group;	/* # Fragments per group */
	uint32_t	s_inodes_per_group;	/* # Inodes per group */
	uint32_t	s_mtime;		/* Mount time */
	uint32_t	s_wtime;		/* Write time */
	uint16_t	s_mnt_count;		/* Mount count */
	int16_t	s_max_mnt_count;	/* Maximal mount count */
	uint16_t	s_magic;		/* Magic signature */
	uint16_t	s_state;		/* File system state */
	uint16_t	s_errors;		/* Behaviour when detecting errors */
	uint16_t	s_minor_rev_level; 	/* minor revision level */
	uint32_t	s_lastcheck;		/* time of last check */
	uint32_t	s_checkinterval;	/* max. time between checks */
	uint32_t	s_creator_os;		/* OS */
	uint32_t	s_rev_level;		/* Revision level */
	uint16_t	s_def_resuid;		/* Default uid for reserved blocks */
	uint16_t	s_def_resgid;		/* Default gid for reserved blocks */
	/*
	 * These fields are for EXT2_DYNAMIC_REV superblocks only.
	 *
	 * Note: the difference between the compatible feature set and
	 * the incompatible feature set is that if there is a bit set
	 * in the incompatible feature set that the kernel doesn't
	 * know about, it should refuse to mount the filesystem.
	 * 
	 * e2fsck's requirements are more strict; if it doesn't know
	 * about a feature in either the compatible or incompatible
	 * feature set, it must abort and not try to meddle with
	 * things it doesn't understand...
	 */
	uint32_t	s_first_ino; 		/* First non-reserved inode */
	uint16_t   s_inode_size; 		/* size of inode structure */
	uint16_t	s_block_group_nr; 	/* block group # of this superblock */
	uint32_t	s_feature_compat; 	/* compatible feature set */
	uint32_t	s_feature_incompat; 	/* incompatible feature set */
	uint32_t	s_feature_ro_compat; 	/* readonly-compatible feature set */
	uint8_t	s_uuid[16];		/* 128-bit uuid for volume */
	char	s_volume_name[16]; 	/* volume name */
	char	s_last_mounted[64]; 	/* directory where last mounted */
	uint32_t	s_algorithm_usage_bitmap; /* For compression */
	/*
	 * Performance hints.  Directory preallocation should only
	 * happen if the EXT2_COMPAT_PREALLOC flag is on.
	 */
	uint8_t	s_prealloc_blocks;	/* Nr of blocks to try to preallocate*/
	uint8_t	s_prealloc_dir_blocks;	/* Nr to preallocate for dirs */
	uint16_t	s_padding1;
	uint32_t	s_reserved[204];	/* Padding to the end of the block */
};
int check_EXT2(disk_t *disk_car,partition_t *partition,const int verbose);
int recover_EXT2(disk_t *disk_car, const struct ext2_super_block *sb,partition_t *partition,const int verbose, const int dump_ind);

#ifdef __cplusplus
} /* closing brace for extern "C" */
#endif