1 | /* $NetBSD: ext2fs_bswap.c,v 1.24 2016/08/20 19:47:44 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 1.24 2016/08/20 19:47:44 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 | new->e4fs_want_extra_isize = bswap16(old->e4fs_want_extra_isize); |
83 | } |
84 | |
85 | void |
86 | e2fs_i_bswap(struct ext2fs_dinode *old, struct ext2fs_dinode *new, size_t isize) |
87 | { |
88 | /* preserve non-swapped and unused fields */ |
89 | memcpy(new, old, isize); |
90 | |
91 | /* swap what needs to be swapped */ |
92 | new->e2di_mode = bswap16(old->e2di_mode); |
93 | new->e2di_uid = bswap16(old->e2di_uid); |
94 | new->e2di_gid = bswap16(old->e2di_gid); |
95 | new->e2di_nlink = bswap16(old->e2di_nlink); |
96 | new->e2di_size = bswap32(old->e2di_size); |
97 | new->e2di_atime = bswap32(old->e2di_atime); |
98 | new->e2di_ctime = bswap32(old->e2di_ctime); |
99 | new->e2di_mtime = bswap32(old->e2di_mtime); |
100 | new->e2di_dtime = bswap32(old->e2di_dtime); |
101 | new->e2di_nblock = bswap32(old->e2di_nblock); |
102 | new->e2di_flags = bswap32(old->e2di_flags); |
103 | new->e2di_version = bswap32(old->e2di_version); |
104 | new->e2di_gen = bswap32(old->e2di_gen); |
105 | new->e2di_facl = bswap32(old->e2di_facl); |
106 | new->e2di_size_high = bswap32(old->e2di_size_high); |
107 | new->e2di_nblock_high = bswap16(old->e2di_nblock_high); |
108 | new->e2di_facl_high = bswap16(old->e2di_facl_high); |
109 | new->e2di_uid_high = bswap16(old->e2di_uid_high); |
110 | new->e2di_gid_high = bswap16(old->e2di_gid_high); |
111 | new->e2di_checksum_low = bswap16(old->e2di_checksum_low); |
112 | |
113 | /* |
114 | * Following fields are only supported for inode sizes bigger |
115 | * than the old ext2 one |
116 | */ |
117 | if (isize == EXT2_REV0_DINODE_SIZE) |
118 | return; |
119 | |
120 | new->e2di_extra_isize = bswap16(old->e2di_extra_isize); |
121 | new->e2di_checksum_high = bswap16(old->e2di_checksum_high); |
122 | |
123 | /* Following fields are ext4, might not be actually present */ |
124 | if (EXT2_DINODE_FITS(new, e2di_ctime_extra, isize)) |
125 | new->e2di_ctime_extra = bswap32(old->e2di_ctime_extra); |
126 | if (EXT2_DINODE_FITS(new, e2di_mtime_extra, isize)) |
127 | new->e2di_mtime_extra = bswap32(old->e2di_mtime_extra); |
128 | if (EXT2_DINODE_FITS(new, e2di_atime_extra, isize)) |
129 | new->e2di_atime_extra = bswap32(old->e2di_atime_extra); |
130 | if (EXT2_DINODE_FITS(new, e2di_crtime, isize)) |
131 | new->e2di_crtime = bswap32(old->e2di_crtime); |
132 | if (EXT2_DINODE_FITS(new, e2di_crtime_extra, isize)) |
133 | new->e2di_crtime_extra = bswap32(old->e2di_crtime_extra); |
134 | if (EXT2_DINODE_FITS(new, e2di_version_high, isize)) |
135 | new->e2di_version_high = bswap32(old->e2di_version_high); |
136 | if (EXT2_DINODE_FITS(new, e2di_projid, isize)) |
137 | new->e2di_projid = bswap32(old->e2di_projid); |
138 | } |
139 | #endif |
140 | |