140 lines
5.8 KiB
C
140 lines
5.8 KiB
C
/* $NetBSD: ext2fs_bswap.c,v 1.24 2016/08/20 19:47:44 jdolecek Exp $ */
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/*
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* Copyright (c) 1997 Manuel Bouyer.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: ext2fs_bswap.c,v 1.24 2016/08/20 19:47:44 jdolecek Exp $");
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#include <sys/types.h>
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#include <ufs/ext2fs/ext2fs.h>
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#include <ufs/ext2fs/ext2fs_dinode.h>
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#if defined(_KERNEL)
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#include <sys/systm.h>
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#else
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#include <string.h>
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#endif
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/* These functions are only needed if native byte order is not little endian */
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#if BYTE_ORDER == BIG_ENDIAN
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void
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e2fs_sb_bswap(struct ext2fs *old, struct ext2fs *new)
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{
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/* preserve unused fields */
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memcpy(new, old, sizeof(struct ext2fs));
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new->e2fs_icount = bswap32(old->e2fs_icount);
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new->e2fs_bcount = bswap32(old->e2fs_bcount);
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new->e2fs_rbcount = bswap32(old->e2fs_rbcount);
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new->e2fs_fbcount = bswap32(old->e2fs_fbcount);
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new->e2fs_ficount = bswap32(old->e2fs_ficount);
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new->e2fs_first_dblock = bswap32(old->e2fs_first_dblock);
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new->e2fs_log_bsize = bswap32(old->e2fs_log_bsize);
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new->e2fs_fsize = bswap32(old->e2fs_fsize);
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new->e2fs_bpg = bswap32(old->e2fs_bpg);
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new->e2fs_fpg = bswap32(old->e2fs_fpg);
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new->e2fs_ipg = bswap32(old->e2fs_ipg);
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new->e2fs_mtime = bswap32(old->e2fs_mtime);
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new->e2fs_wtime = bswap32(old->e2fs_wtime);
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new->e2fs_mnt_count = bswap16(old->e2fs_mnt_count);
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new->e2fs_max_mnt_count = bswap16(old->e2fs_max_mnt_count);
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new->e2fs_magic = bswap16(old->e2fs_magic);
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new->e2fs_state = bswap16(old->e2fs_state);
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new->e2fs_beh = bswap16(old->e2fs_beh);
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new->e2fs_minrev = bswap16(old->e2fs_minrev);
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new->e2fs_lastfsck = bswap32(old->e2fs_lastfsck);
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new->e2fs_fsckintv = bswap32(old->e2fs_fsckintv);
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new->e2fs_creator = bswap32(old->e2fs_creator);
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new->e2fs_rev = bswap32(old->e2fs_rev);
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new->e2fs_ruid = bswap16(old->e2fs_ruid);
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new->e2fs_rgid = bswap16(old->e2fs_rgid);
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new->e2fs_first_ino = bswap32(old->e2fs_first_ino);
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new->e2fs_inode_size = bswap16(old->e2fs_inode_size);
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new->e2fs_block_group_nr = bswap16(old->e2fs_block_group_nr);
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new->e2fs_features_compat = bswap32(old->e2fs_features_compat);
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new->e2fs_features_incompat = bswap32(old->e2fs_features_incompat);
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new->e2fs_features_rocompat = bswap32(old->e2fs_features_rocompat);
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new->e2fs_algo = bswap32(old->e2fs_algo);
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new->e2fs_reserved_ngdb = bswap16(old->e2fs_reserved_ngdb);
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new->e4fs_want_extra_isize = bswap16(old->e4fs_want_extra_isize);
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}
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void
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e2fs_i_bswap(struct ext2fs_dinode *old, struct ext2fs_dinode *new, size_t isize)
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{
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/* preserve non-swapped and unused fields */
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memcpy(new, old, isize);
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/* swap what needs to be swapped */
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new->e2di_mode = bswap16(old->e2di_mode);
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new->e2di_uid = bswap16(old->e2di_uid);
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new->e2di_gid = bswap16(old->e2di_gid);
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new->e2di_nlink = bswap16(old->e2di_nlink);
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new->e2di_size = bswap32(old->e2di_size);
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new->e2di_atime = bswap32(old->e2di_atime);
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new->e2di_ctime = bswap32(old->e2di_ctime);
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new->e2di_mtime = bswap32(old->e2di_mtime);
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new->e2di_dtime = bswap32(old->e2di_dtime);
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new->e2di_nblock = bswap32(old->e2di_nblock);
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new->e2di_flags = bswap32(old->e2di_flags);
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new->e2di_version = bswap32(old->e2di_version);
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new->e2di_gen = bswap32(old->e2di_gen);
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new->e2di_facl = bswap32(old->e2di_facl);
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new->e2di_size_high = bswap32(old->e2di_size_high);
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new->e2di_nblock_high = bswap16(old->e2di_nblock_high);
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new->e2di_facl_high = bswap16(old->e2di_facl_high);
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new->e2di_uid_high = bswap16(old->e2di_uid_high);
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new->e2di_gid_high = bswap16(old->e2di_gid_high);
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new->e2di_checksum_low = bswap16(old->e2di_checksum_low);
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/*
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* Following fields are only supported for inode sizes bigger
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* than the old ext2 one
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*/
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if (isize == EXT2_REV0_DINODE_SIZE)
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return;
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new->e2di_extra_isize = bswap16(old->e2di_extra_isize);
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new->e2di_checksum_high = bswap16(old->e2di_checksum_high);
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/* Following fields are ext4, might not be actually present */
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if (EXT2_DINODE_FITS(new, e2di_ctime_extra, isize))
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new->e2di_ctime_extra = bswap32(old->e2di_ctime_extra);
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if (EXT2_DINODE_FITS(new, e2di_mtime_extra, isize))
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new->e2di_mtime_extra = bswap32(old->e2di_mtime_extra);
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if (EXT2_DINODE_FITS(new, e2di_atime_extra, isize))
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new->e2di_atime_extra = bswap32(old->e2di_atime_extra);
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if (EXT2_DINODE_FITS(new, e2di_crtime, isize))
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new->e2di_crtime = bswap32(old->e2di_crtime);
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if (EXT2_DINODE_FITS(new, e2di_crtime_extra, isize))
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new->e2di_crtime_extra = bswap32(old->e2di_crtime_extra);
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if (EXT2_DINODE_FITS(new, e2di_version_high, isize))
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new->e2di_version_high = bswap32(old->e2di_version_high);
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if (EXT2_DINODE_FITS(new, e2di_projid, isize))
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new->e2di_projid = bswap32(old->e2di_projid);
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}
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#endif
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