/*      $NetBSD: ext2fs_bswap.c,v 1.26 2025/12/24 15:06:59 nia 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 1.26 2025/12/24 15:06:59 nia Exp $");

#include <sys/types.h>
#include <sys/endian.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