ext2fs_bswap.c revision 1.22
1 /* $NetBSD: ext2fs_bswap.c,v 1.22 2016/08/04 17:43:48 jdolecek Exp $ */ 2 3 /* 4 * Copyright (c) 1997 Manuel Bouyer. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 * 26 */ 27 28 #include <sys/cdefs.h> 29 __KERNEL_RCSID(0, "$NetBSD: ext2fs_bswap.c,v 1.22 2016/08/04 17:43:48 jdolecek Exp $"); 30 31 #include <sys/types.h> 32 #include <ufs/ext2fs/ext2fs.h> 33 #include <ufs/ext2fs/ext2fs_dinode.h> 34 35 #if defined(_KERNEL) 36 #include <sys/systm.h> 37 #else 38 #include <string.h> 39 #endif 40 41 /* These functions are only needed if native byte order is not little endian */ 42 #if BYTE_ORDER == BIG_ENDIAN 43 void 44 e2fs_sb_bswap(struct ext2fs *old, struct ext2fs *new) 45 { 46 47 /* preserve unused fields */ 48 memcpy(new, old, sizeof(struct ext2fs)); 49 new->e2fs_icount = bswap32(old->e2fs_icount); 50 new->e2fs_bcount = bswap32(old->e2fs_bcount); 51 new->e2fs_rbcount = bswap32(old->e2fs_rbcount); 52 new->e2fs_fbcount = bswap32(old->e2fs_fbcount); 53 new->e2fs_ficount = bswap32(old->e2fs_ficount); 54 new->e2fs_first_dblock = bswap32(old->e2fs_first_dblock); 55 new->e2fs_log_bsize = bswap32(old->e2fs_log_bsize); 56 new->e2fs_fsize = bswap32(old->e2fs_fsize); 57 new->e2fs_bpg = bswap32(old->e2fs_bpg); 58 new->e2fs_fpg = bswap32(old->e2fs_fpg); 59 new->e2fs_ipg = bswap32(old->e2fs_ipg); 60 new->e2fs_mtime = bswap32(old->e2fs_mtime); 61 new->e2fs_wtime = bswap32(old->e2fs_wtime); 62 new->e2fs_mnt_count = bswap16(old->e2fs_mnt_count); 63 new->e2fs_max_mnt_count = bswap16(old->e2fs_max_mnt_count); 64 new->e2fs_magic = bswap16(old->e2fs_magic); 65 new->e2fs_state = bswap16(old->e2fs_state); 66 new->e2fs_beh = bswap16(old->e2fs_beh); 67 new->e2fs_minrev = bswap16(old->e2fs_minrev); 68 new->e2fs_lastfsck = bswap32(old->e2fs_lastfsck); 69 new->e2fs_fsckintv = bswap32(old->e2fs_fsckintv); 70 new->e2fs_creator = bswap32(old->e2fs_creator); 71 new->e2fs_rev = bswap32(old->e2fs_rev); 72 new->e2fs_ruid = bswap16(old->e2fs_ruid); 73 new->e2fs_rgid = bswap16(old->e2fs_rgid); 74 new->e2fs_first_ino = bswap32(old->e2fs_first_ino); 75 new->e2fs_inode_size = bswap16(old->e2fs_inode_size); 76 new->e2fs_block_group_nr = bswap16(old->e2fs_block_group_nr); 77 new->e2fs_features_compat = bswap32(old->e2fs_features_compat); 78 new->e2fs_features_incompat = bswap32(old->e2fs_features_incompat); 79 new->e2fs_features_rocompat = bswap32(old->e2fs_features_rocompat); 80 new->e2fs_algo = bswap32(old->e2fs_algo); 81 new->e2fs_reserved_ngdb = bswap16(old->e2fs_reserved_ngdb); 82 } 83 84 void 85 e2fs_cg_bswap(struct ext2_gd *old, struct ext2_gd *new, int size) 86 { 87 int i; 88 89 for (i = 0; i < (size / (int)sizeof(struct ext2_gd)); i++) { 90 new[i].ext2bgd_b_bitmap = bswap32(old[i].ext2bgd_b_bitmap); 91 new[i].ext2bgd_i_bitmap = bswap32(old[i].ext2bgd_i_bitmap); 92 new[i].ext2bgd_i_tables = bswap32(old[i].ext2bgd_i_tables); 93 new[i].ext2bgd_nbfree = bswap16(old[i].ext2bgd_nbfree); 94 new[i].ext2bgd_nifree = bswap16(old[i].ext2bgd_nifree); 95 new[i].ext2bgd_ndirs = bswap16(old[i].ext2bgd_ndirs); 96 } 97 } 98 99 void 100 e2fs_i_bswap(struct ext2fs_dinode *old, struct ext2fs_dinode *new, size_t isize) 101 { 102 /* preserve non-swapped and unused fields */ 103 memcpy(new, old, isize); 104 105 /* swap what needs to be swapped */ 106 new->e2di_mode = bswap16(old->e2di_mode); 107 new->e2di_uid = bswap16(old->e2di_uid); 108 new->e2di_gid = bswap16(old->e2di_gid); 109 new->e2di_nlink = bswap16(old->e2di_nlink); 110 new->e2di_size = bswap32(old->e2di_size); 111 new->e2di_atime = bswap32(old->e2di_atime); 112 new->e2di_ctime = bswap32(old->e2di_ctime); 113 new->e2di_mtime = bswap32(old->e2di_mtime); 114 new->e2di_dtime = bswap32(old->e2di_dtime); 115 new->e2di_nblock = bswap32(old->e2di_nblock); 116 new->e2di_flags = bswap32(old->e2di_flags); 117 new->e2di_version = bswap32(old->e2di_version); 118 new->e2di_gen = bswap32(old->e2di_gen); 119 new->e2di_facl = bswap32(old->e2di_facl); 120 new->e2di_size_high = bswap32(old->e2di_size_high); 121 new->e2di_nblock_high = bswap16(old->e2di_nblock_high); 122 new->e2di_facl_high = bswap16(old->e2di_facl_high); 123 new->e2di_uid_high = bswap16(old->e2di_uid_high); 124 new->e2di_gid_high = bswap16(old->e2di_gid_high); 125 new->e2di_checksum_low = bswap16(old->e2di_checksum_low); 126 127 /* 128 * Following fields are only supported for inode sizes bigger 129 * than the old ext2 one 130 */ 131 if (isize == EXT2_REV0_DINODE_SIZE) 132 return; 133 134 new->e2di_extra_isize = bswap16(old->e2di_extra_isize); 135 new->e2di_checksum_high = bswap16(old->e2di_checksum_high); 136 137 /* Following fields are ext4, might not be actually present */ 138 if (EXT2_DINODE_FITS(new, e2di_ctime_extra, isize)) 139 new->e2di_ctime_extra = bswap32(old->e2di_ctime_extra); 140 if (EXT2_DINODE_FITS(new, e2di_mtime_extra, isize)) 141 new->e2di_mtime_extra = bswap32(old->e2di_mtime_extra); 142 if (EXT2_DINODE_FITS(new, e2di_atime_extra, isize)) 143 new->e2di_atime_extra = bswap32(old->e2di_atime_extra); 144 if (EXT2_DINODE_FITS(new, e2di_crtime, isize)) 145 new->e2di_crtime = bswap32(old->e2di_crtime); 146 if (EXT2_DINODE_FITS(new, e2di_crtime_extra, isize)) 147 new->e2di_crtime_extra = bswap32(old->e2di_crtime_extra); 148 if (EXT2_DINODE_FITS(new, e2di_version_high, isize)) 149 new->e2di_version_high = bswap32(old->e2di_version_high); 150 if (EXT2_DINODE_FITS(new, e2di_projid, isize)) 151 new->e2di_projid = bswap32(old->e2di_projid); 152 } 153 #endif 154
Indexes created Tue Sep 30 11:09:46 GMT 2025