ext2fs_bswap.c   [plain text]


/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * The contents of this file constitute Original Code as defined in and
 * are subject to the Apple Public Source License Version 1.1 (the
 * "License").  You may not use this file except in compliance with the
 * License.  Please obtain a copy of the License at
 * http://www.apple.com/publicsource and read it before using this file.
 * 
 * This Original Code and all software distributed under the License are
 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/*	$NetBSD: ext2fs_bswap.c,v 1.4 2000/01/28 16:00:23 bouyer Exp $	*/
/*
 * Copyright (c) 1997 Manuel Bouyer.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 */
/*
 *  ext2fs_bswap.c - Functions for endian swapping Ext2 disk structures.
 *
 *  Copyright (c) 2000 Apple Computer, Inc.
 *
 *  DRI: Josh de Cesare
 */

#include <sl.h>

#include "ext2fs.h"
#include "ext2fs_dinode.h"

/* These functions are only needed if native byte order is not big endian */
#if BYTE_ORDER == BIG_ENDIAN
void
e2fs_sb_bswap(old, new)
	struct ext2fs *old, *new;
{
	/* preserve unused fields */
	memcpy(new, old, sizeof(struct ext2fs));
	new->e2fs_icount	=	bswap32(old->e2fs_icount);
	new->e2fs_bcount	=	bswap32(old->e2fs_bcount);
	new->e2fs_rbcount	=	bswap32(old->e2fs_rbcount);
	new->e2fs_fbcount	=	bswap32(old->e2fs_fbcount);
	new->e2fs_ficount	=	bswap32(old->e2fs_ficount);
	new->e2fs_first_dblock	=	bswap32(old->e2fs_first_dblock);
	new->e2fs_log_bsize	=	bswap32(old->e2fs_log_bsize);
	new->e2fs_fsize		=	bswap32(old->e2fs_fsize);
	new->e2fs_bpg		=	bswap32(old->e2fs_bpg);
	new->e2fs_fpg		=	bswap32(old->e2fs_fpg);
	new->e2fs_ipg		=	bswap32(old->e2fs_ipg);
	new->e2fs_mtime		=	bswap32(old->e2fs_mtime);
	new->e2fs_wtime		=	bswap32(old->e2fs_wtime);
	new->e2fs_mnt_count	=	bswap16(old->e2fs_mnt_count);
	new->e2fs_max_mnt_count	=	bswap16(old->e2fs_max_mnt_count);
	new->e2fs_magic		=	bswap16(old->e2fs_magic);
	new->e2fs_state		=	bswap16(old->e2fs_state);
	new->e2fs_beh		=	bswap16(old->e2fs_beh);
	new->e2fs_minrev	=	bswap16(old->e2fs_minrev);
	new->e2fs_lastfsck	=	bswap32(old->e2fs_lastfsck);
	new->e2fs_fsckintv	=	bswap32(old->e2fs_fsckintv);
	new->e2fs_creator	=	bswap32(old->e2fs_creator);
	new->e2fs_rev		=	bswap32(old->e2fs_rev);
	new->e2fs_ruid		=	bswap16(old->e2fs_ruid);
	new->e2fs_rgid		=	bswap16(old->e2fs_rgid);
	new->e2fs_first_ino	=	bswap32(old->e2fs_first_ino);
	new->e2fs_inode_size	=	bswap16(old->e2fs_inode_size);
	new->e2fs_block_group_nr =	bswap16(old->e2fs_block_group_nr);
	new->e2fs_features_compat =	bswap32(old->e2fs_features_compat);
	new->e2fs_features_incompat =	bswap32(old->e2fs_features_incompat);
	new->e2fs_features_rocompat =	bswap32(old->e2fs_features_rocompat);
	new->e2fs_algo		=	bswap32(old->e2fs_algo);
}

void e2fs_cg_bswap(old, new, size)
	struct  ext2_gd *old, *new;
	int size;
{
	int i;
	for (i=0; i < (size / sizeof(struct  ext2_gd)); i++) {
		new[i].ext2bgd_b_bitmap	= bswap32(old[i].ext2bgd_b_bitmap);
		new[i].ext2bgd_i_bitmap	= bswap32(old[i].ext2bgd_i_bitmap);
		new[i].ext2bgd_i_tables	= bswap32(old[i].ext2bgd_i_tables);
		new[i].ext2bgd_nbfree	= bswap16(old[i].ext2bgd_nbfree);
		new[i].ext2bgd_nifree	= bswap16(old[i].ext2bgd_nifree);
		new[i].ext2bgd_ndirs	= bswap16(old[i].ext2bgd_ndirs);
	}
}

void e2fs_i_bswap(old, new)
	struct ext2fs_dinode *old, *new;
{
	new->e2di_mode		=	bswap16(old->e2di_mode);
	new->e2di_uid		=	bswap16(old->e2di_uid);
	new->e2di_gid		=	bswap16(old->e2di_gid);
	new->e2di_nlink		=	bswap16(old->e2di_nlink);
	new->e2di_size		=	bswap32(old->e2di_size);
	new->e2di_atime		=	bswap32(old->e2di_atime);
	new->e2di_ctime		=	bswap32(old->e2di_ctime);
	new->e2di_mtime		=	bswap32(old->e2di_mtime);
	new->e2di_dtime		=	bswap32(old->e2di_dtime);
	new->e2di_nblock	=	bswap32(old->e2di_nblock);
	new->e2di_flags		=	bswap32(old->e2di_flags);
	new->e2di_gen		=	bswap32(old->e2di_gen);
	new->e2di_facl		=	bswap32(old->e2di_facl);
	new->e2di_dacl		=	bswap32(old->e2di_dacl);
	new->e2di_faddr		=	bswap32(old->e2di_faddr);
        memcpy(&new->e2di_blocks[0], &old->e2di_blocks[0],
		(NDADDR+NIADDR) * sizeof(int));
}
#endif