squashfs_operations *read_filesystem_tables_3()
{
	long long table_start;

	/* Read uid and gid lookup tables */

	/* Sanity check super block contents */
	if(sBlk.no_guids) {
		if(sBlk.guid_start >= sBlk.s.bytes_used) {
			ERROR("read_filesystem_tables: gid start too large in super block\n");
			goto corrupted;
		}

		if(read_ids(sBlk.no_guids, sBlk.guid_start, sBlk.s.bytes_used, &guid_table) == FALSE)
			goto corrupted;

		table_start = sBlk.guid_start;
	} else {
		/* no guids, guid_start should be 0 */
		if(sBlk.guid_start != 0) {
			ERROR("read_filesystem_tables: gid start too large in super block\n");
			goto corrupted;
		}

		table_start = sBlk.s.bytes_used;
	}

	if(sBlk.uid_start >= table_start) {
		ERROR("read_filesystem_tables: uid start too large in super block\n");
		goto corrupted;
	}

	/* There should be at least one uid */
	if(sBlk.no_uids == 0) {
		ERROR("read_filesystem_tables: uid count bad in super block\n");
		goto corrupted;
	}

	if(read_ids(sBlk.no_uids, sBlk.uid_start, table_start, &uid_table) == FALSE)
		goto corrupted;

	table_start = sBlk.uid_start;

	/* Read exports table */
	if(sBlk.s.lookup_table_start != SQUASHFS_INVALID_BLK) {

		/* sanity check super block contents */
		if(sBlk.s.lookup_table_start >= table_start) {
			ERROR("read_filesystem_tables: lookup table start too large in super block\n");
			goto corrupted;
		}

		if(parse_exports_table(&table_start) == FALSE)
			goto corrupted;
	}

	/* Read fragment table */
	if(sBlk.s.fragments != 0) {

		/* Sanity check super block contents */
		if(sBlk.s.fragment_table_start >= table_start) {
			ERROR("read_filesystem_tables: fragment table start too large in super block\n");
			goto corrupted;
		}

		/* The number of fragments should not exceed the number of inodes */
		if(sBlk.s.fragments > sBlk.s.inodes) {
			ERROR("read_filesystem_tables: Bad fragment count in super block\n");
			goto corrupted;
		}

		if(read_fragment_table(&table_start) == FALSE)
			goto corrupted;
	} else {
		/*
		 * Sanity check super block contents - with 0 fragments,
		 * the fragment table should be empty
		 */
		if(sBlk.s.fragment_table_start != table_start) {
			ERROR("read_filesystem_tables: fragment table start invalid in super block\n");
			goto corrupted;
		}
	}

	/* Read directory table */

	/* Sanity check super block contents */
	if(sBlk.s.directory_table_start > table_start) {
		ERROR("read_filesystem_tables: directory table start too large in super block\n");
		goto corrupted;
	}

	directory_table = read_directory_table(sBlk.s.directory_table_start,
				table_start);
	if(directory_table == NULL)
		goto corrupted;

	/* Read inode table */

	/* Sanity check super block contents */
	if(sBlk.s.inode_table_start >= sBlk.s.directory_table_start) {
		ERROR("read_filesystem_tables: inode table start too large in super block\n");
		goto corrupted;
	}

	inode_table = read_inode_table(sBlk.s.inode_table_start,
				sBlk.s.directory_table_start);
	if(inode_table == NULL)
		goto corrupted;

	alloc_index_table(0);
	salloc_index_table(0);

	return &ops;

corrupted:
	ERROR("File system corruption detected\n");
	alloc_index_table(0);
	salloc_index_table(0);

	return NULL;
}
squashfs_operations *read_filesystem_tables_3()
{
	long long table_start;

	 

	 
	if(sBlk.no_guids) {
		if(sBlk.guid_start >= sBlk.s.bytes_used) {
			ERROR("read_filesystem_tables: gid start too large in super block\n");
			goto corrupted;
		}

		if(read_ids(sBlk.no_guids, sBlk.guid_start, sBlk.s.bytes_used, &guid_table) == FALSE)
			goto corrupted;

		table_start = sBlk.guid_start;
	} else {
		 
		if(sBlk.guid_start != 0) {
			ERROR("read_filesystem_tables: gid start too large in super block\n");
			goto corrupted;
		}

		table_start = sBlk.s.bytes_used;
	}

	if(sBlk.uid_start >= table_start) {
		ERROR("read_filesystem_tables: uid start too large in super block\n");
		goto corrupted;
	}

	 
	if(sBlk.no_uids == 0) {
		ERROR("read_filesystem_tables: uid count bad in super block\n");
		goto corrupted;
	}

	if(read_ids(sBlk.no_uids, sBlk.uid_start, table_start, &uid_table) == FALSE)
		goto corrupted;

	table_start = sBlk.uid_start;

	 
	if(sBlk.s.lookup_table_start != SQUASHFS_INVALID_BLK) {

		 
		if(sBlk.s.lookup_table_start >= table_start) {
			ERROR("read_filesystem_tables: lookup table start too large in super block\n");
			goto corrupted;
		}

		if(parse_exports_table(&table_start) == FALSE)
			goto corrupted;
	}

	 
	if(sBlk.s.fragments != 0) {

		 
		if(sBlk.s.fragment_table_start >= table_start) {
			ERROR("read_filesystem_tables: fragment table start too large in super block\n");
			goto corrupted;
		}

		 
		if(sBlk.s.fragments > sBlk.s.inodes) {
			ERROR("read_filesystem_tables: Bad fragment count in super block\n");
			goto corrupted;
		}

		if(read_fragment_table(&table_start) == FALSE)
			goto corrupted;
	} else {
		 
		if(sBlk.s.fragment_table_start != table_start) {
			ERROR("read_filesystem_tables: fragment table start invalid in super block\n");
			goto corrupted;
		}
	}

	 

	 
	if(sBlk.s.directory_table_start > table_start) {
		ERROR("read_filesystem_tables: directory table start too large in super block\n");
		goto corrupted;
	}

	directory_table = read_directory_table(sBlk.s.directory_table_start,
				table_start);
	if(directory_table == NULL)
		goto corrupted;

	 

	 
	if(sBlk.s.inode_table_start >= sBlk.s.directory_table_start) {
		ERROR("read_filesystem_tables: inode table start too large in super block\n");
		goto corrupted;
	}

	inode_table = read_inode_table(sBlk.s.inode_table_start,
				sBlk.s.directory_table_start);
	if(inode_table == NULL)
		goto corrupted;

	alloc_index_table(0);
	salloc_index_table(0);

	return &ops;

corrupted:
	ERROR("File system corruption detected\n");
	alloc_index_table(0);
	salloc_index_table(0);

	return NULL;
}