ufs_bswap.h revision 196696
1249259Sdim/*	$NetBSD: ufs_bswap.h,v 1.13 2003/10/05 17:48:50 bouyer Exp $	*/
2249259Sdim
3249259Sdim/*
4249259Sdim * Copyright (c) 1998 Manuel Bouyer.
5249259Sdim *
6249259Sdim * Redistribution and use in source and binary forms, with or without
7249259Sdim * modification, are permitted provided that the following conditions
8249259Sdim * are met:
9249259Sdim * 1. Redistributions of source code must retain the above copyright
10249259Sdim *    notice, this list of conditions and the following disclaimer.
11249259Sdim * 2. Redistributions in binary form must reproduce the above copyright
12249259Sdim *    notice, this list of conditions and the following disclaimer in the
13249259Sdim *    documentation and/or other materials provided with the distribution.
14249259Sdim * 3. All advertising materials mentioning features or use of this software
15249259Sdim *    must display the following acknowledgement:
16249259Sdim *	This product includes software developed by Manuel Bouyer.
17249259Sdim * 4. The name of the author may not be used to endorse or promote products
18249259Sdim *    derived from this software without specific prior written permission.
19249259Sdim *
20249259Sdim * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
21249259Sdim * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
22249259Sdim * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
23249259Sdim * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
24249259Sdim * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
25249259Sdim * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26249259Sdim * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27249259Sdim * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28249259Sdim * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
29249259Sdim * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30249259Sdim *
31249259Sdim * $FreeBSD: head/usr.sbin/makefs/ffs/ufs_bswap.h 196696 2009-08-31 13:23:55Z jhb $
32249259Sdim */
33249259Sdim
34249259Sdim#ifndef _UFS_UFS_BSWAP_H_
35249259Sdim#define _UFS_UFS_BSWAP_H_
36249259Sdim
37249259Sdim#if defined(_KERNEL_OPT)
38251662Sdim#include "opt_ffs.h"
39251662Sdim#endif
40249259Sdim
41249259Sdim#include <sys/endian.h>
42249259Sdim
43249259Sdim/* Macros to access UFS flags */
44249259Sdim#ifdef FFS_EI
45249259Sdim#define	UFS_MPNEEDSWAP(mp)	(VFSTOUFS(mp)->um_flags & UFS_NEEDSWAP)
46249259Sdim#define UFS_FSNEEDSWAP(fs)	((fs)->fs_flags & FS_SWAPPED)
47249259Sdim#define	UFS_IPNEEDSWAP(ip)	UFS_MPNEEDSWAP(ITOV(ip)->v_mount)
48249259Sdim#else
49249259Sdim#define	UFS_MPNEEDSWAP(mp) (0)
50249259Sdim#define UFS_FSNEEDSWAP(fs) (0)
51251662Sdim#define	UFS_IPNEEDSWAP(ip) (0)
52251662Sdim#endif
53249259Sdim
54249259Sdim#if !defined(_KERNEL) || defined(FFS_EI)
55249259Sdim/* inlines for access to swapped data */
56249259Sdimstatic __inline u_int16_t ufs_rw16 __P((u_int16_t, int));
57249259Sdimstatic __inline u_int32_t ufs_rw32 __P((u_int32_t, int));
58static __inline u_int64_t ufs_rw64 __P((u_int64_t, int));
59
60static __inline u_int16_t
61ufs_rw16(u_int16_t a, int ns)
62{
63	return ((ns) ?  bswap16(a) : (a));
64}
65static __inline u_int32_t
66ufs_rw32(u_int32_t a, int ns)
67{
68	return ((ns) ?  bswap32(a) : (a));
69}
70static __inline u_int64_t
71ufs_rw64(u_int64_t a, int ns)
72{
73	return ((ns) ?  bswap64(a) : (a));
74}
75#else
76#define ufs_rw16(a, ns) ((uint16_t)(a))
77#define ufs_rw32(a, ns) ((uint32_t)(a))
78#define ufs_rw64(a, ns) ((uint64_t)(a))
79#endif
80
81#define ufs_add16(a, b, ns) \
82	(a) = ufs_rw16(ufs_rw16((a), (ns)) + (b), (ns))
83#define ufs_add32(a, b, ns) \
84	(a) = ufs_rw32(ufs_rw32((a), (ns)) + (b), (ns))
85#define ufs_add64(a, b, ns) \
86	(a) = ufs_rw64(ufs_rw64((a), (ns)) + (b), (ns))
87
88#endif /* !_UFS_UFS_BSWAP_H_ */
89