/* $NetBSD: ext2fs_bswap.c,v 1.25 2023/08/26 05:22:50 riastradh Exp $ */

/* $NetBSD: ext2fs_bswap.c,v 1.25 2023/08/26 05:22:50 riastradh 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ext2fs_bswap.c,v 1.25 2023/08/26 05:22:50 riastradh Exp $");

#include <sys/types.h>
#include <ufs/ext2fs/ext2fs.h>
#include <ufs/ext2fs/ext2fs_dinode.h>

#if defined(_KERNEL)
#include <sys/systm.h>
#else
#include <string.h>
#endif

/* These functions are only needed if native byte order is not little endian */
#if BYTE_ORDER == BIG_ENDIAN
void
e2fs_sb_bswap(struct ext2fs *old, struct ext2fs *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);
new->e2fs_reserved_ngdb = bswap16(old->e2fs_reserved_ngdb);
new->e4fs_want_extra_isize = bswap16(old->e4fs_want_extra_isize);
}

void
e2fs_i_bswap(struct ext2fs_dinode *old, struct ext2fs_dinode *new, size_t isize)
{
/* preserve non-swapped and unused fields */
memcpy(new, old, isize);

/* swap what needs to be swapped */
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_version = bswap32(old->e2di_version);
new->e2di_gen = bswap32(old->e2di_gen);
new->e2di_facl = bswap32(old->e2di_facl);
new->e2di_size_high = bswap32(old->e2di_size_high);
new->e2di_nblock_high = bswap16(old->e2di_nblock_high);
new->e2di_facl_high = bswap16(old->e2di_facl_high);
new->e2di_uid_high = bswap16(old->e2di_uid_high);
new->e2di_gid_high = bswap16(old->e2di_gid_high);
new->e2di_checksum_low = bswap16(old->e2di_checksum_low);

/*
* Following fields are only supported for inode sizes bigger
* than the old ext2 one
*/
if (isize == EXT2_REV0_DINODE_SIZE)
return;

new->e2di_extra_isize = bswap16(old->e2di_extra_isize);
new->e2di_checksum_high = bswap16(old->e2di_checksum_high);

/* Following fields are ext4, might not be actually present */
if (EXT2_DINODE_FITS(new, e2di_ctime_extra, isize))
new->e2di_ctime_extra = bswap32(old->e2di_ctime_extra);
if (EXT2_DINODE_FITS(new, e2di_mtime_extra, isize))
new->e2di_mtime_extra = bswap32(old->e2di_mtime_extra);
if (EXT2_DINODE_FITS(new, e2di_atime_extra, isize))
new->e2di_atime_extra = bswap32(old->e2di_atime_extra);
if (EXT2_DINODE_FITS(new, e2di_crtime, isize))
new->e2di_crtime = bswap32(old->e2di_crtime);
if (EXT2_DINODE_FITS(new, e2di_crtime_extra, isize))
new->e2di_crtime_extra = bswap32(old->e2di_crtime_extra);
if (EXT2_DINODE_FITS(new, e2di_version_high, isize))
new->e2di_version_high = bswap32(old->e2di_version_high);
if (EXT2_DINODE_FITS(new, e2di_projid, isize))
new->e2di_projid = bswap32(old->e2di_projid);
}
#endif