VirtualBox

source: vbox/trunk/src/VBox/Devices/Storage/swab.h@ 82254

Last change on this file since 82254 was 76565, checked in by vboxsync, 6 years ago

Devices: Use VBOX_INCLUDED_SRC_ as header guard prefix with scm.

  • Property svn:eol-style set to native
  • Property svn:keywords set to Author Date Id Revision
File size: 2.2 KB
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1/* $Id: swab.h 76565 2019-01-01 04:23:20Z vboxsync $ */
2/** @file
3 *
4 * VBox storage devices:
5 * C++-safe replacements for some Linux byte order macros
6 *
7 * On Linux, DrvHostDVD.cpp includes <linux/cdrom.h>, which in turn
8 * includes <linux/byteorder/swab.h>. Unfortunately, that file is not very
9 * C++ friendly, and our C++ compiler refuses to look at it. The solution
10 * is to define _LINUX_BYTEORDER_SWAB_H, which prevents that file's contents
11 * from getting included at all, and to provide, in this file, our own
12 * C++-proof versions of the macros which are needed by <linux/cdrom.h>
13 * before we include that file. We actually provide them as inline
14 * functions, due to the way they get resolved in the original.
15 */
16
17/*
18 * Copyright (C) 2006-2019 Oracle Corporation
19 *
20 * This file is part of VirtualBox Open Source Edition (OSE), as
21 * available from http://www.virtualbox.org. This file is free software;
22 * you can redistribute it and/or modify it under the terms of the GNU
23 * General Public License (GPL) as published by the Free Software
24 * Foundation, in version 2 as it comes in the "COPYING" file of the
25 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
26 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
27 */
28
29#ifndef VBOX_INCLUDED_SRC_Storage_swab_h
30#define VBOX_INCLUDED_SRC_Storage_swab_h
31#ifndef RT_WITHOUT_PRAGMA_ONCE
32# pragma once
33#endif
34
35#define _LINUX_BYTEORDER_SWAB_H
36#define _LINUX_BYTEORDER_SWABB_H
37
38#include <asm/types.h>
39
40/* Sorry for the unnecessary brackets here, but I really think
41 readability requires them */
42static __inline__ __u16 __swab16p(const __u16 *px)
43{
44 __u16 x = *px;
45 return ((x & 0xff) << 8) | ((x >> 8) & 0xff);
46}
47
48static __inline__ __u32 __swab32p(const __u32 *px)
49{
50 __u32 x = *px;
51 return ((x & 0xff) << 24) | ((x & 0xff00) << 8)
52 | ((x >> 8) & 0xff00) | ((x >> 24) & 0xff);
53}
54
55static __inline__ __u64 __swab64p(const __u64 *px)
56{
57 __u64 x = *px;
58 return ((x & 0xff) << 56) | ((x & 0xff00) << 40)
59 | ((x & 0xff0000) << 24) | ((x & 0xff000000) << 8)
60 | ((x >> 8) & 0xff000000) | ((x >> 24) & 0xff0000)
61 | ((x >> 40) & 0xff00) | ((x >> 56) & 0xff);
62}
63
64#endif /* !VBOX_INCLUDED_SRC_Storage_swab_h */
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