1/*
2 * Copyright (c) 2006 Apple Computer, Inc. All rights reserved.
3 *
4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. The rights granted to you under the License
10 * may not be used to create, or enable the creation or redistribution of,
11 * unlawful or unlicensed copies of an Apple operating system, or to
12 * circumvent, violate, or enable the circumvention or violation of, any
13 * terms of an Apple operating system software license agreement.
14 *
15 * Please obtain a copy of the License at
16 * http://www.opensource.apple.com/apsl/ and read it before using this file.
17 *
18 * The Original Code and all software distributed under the License are
19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23 * Please see the License for the specific language governing rights and
24 * limitations under the License.
25 *
26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27 */
28
29#ifndef _OS__OSBYTEORDER_H
30#define _OS__OSBYTEORDER_H
31
32/*
33 * This header is normally included from <libkern/OSByteOrder.h>.  However,
34 * <sys/_endian.h> also includes this in the case of little-endian
35 * architectures, so that we can map OSByteOrder routines to the hton* and ntoh*
36 * macros.  This results in the asymmetry below; we only include
37 * <libkern/arch/_OSByteOrder.h> for little-endian architectures.
38 */
39
40#include <sys/_types.h>
41
42/* Macros for swapping constant values in the preprocessing stage. */
43#define __DARWIN_OSSwapConstInt16(x) \
44    ((__uint16_t)((((__uint16_t)(x) & 0xff00) >> 8) | \
45                (((__uint16_t)(x) & 0x00ff) << 8)))
46
47#define __DARWIN_OSSwapConstInt32(x) \
48    ((__uint32_t)((((__uint32_t)(x) & 0xff000000) >> 24) | \
49                (((__uint32_t)(x) & 0x00ff0000) >>  8) | \
50                (((__uint32_t)(x) & 0x0000ff00) <<  8) | \
51                (((__uint32_t)(x) & 0x000000ff) << 24)))
52
53#define __DARWIN_OSSwapConstInt64(x) \
54    ((__uint64_t)((((__uint64_t)(x) & 0xff00000000000000ULL) >> 56) | \
55                (((__uint64_t)(x) & 0x00ff000000000000ULL) >> 40) | \
56                (((__uint64_t)(x) & 0x0000ff0000000000ULL) >> 24) | \
57                (((__uint64_t)(x) & 0x000000ff00000000ULL) >>  8) | \
58                (((__uint64_t)(x) & 0x00000000ff000000ULL) <<  8) | \
59                (((__uint64_t)(x) & 0x0000000000ff0000ULL) << 24) | \
60                (((__uint64_t)(x) & 0x000000000000ff00ULL) << 40) | \
61                (((__uint64_t)(x) & 0x00000000000000ffULL) << 56)))
62
63#if defined(__GNUC__)
64
65#if defined(__i386__) || defined(__x86_64__)
66#include <libkern/i386/_OSByteOrder.h>
67#endif
68
69
70
71#define __DARWIN_OSSwapInt16(x) \
72    ((__uint16_t)(__builtin_constant_p(x) ? __DARWIN_OSSwapConstInt16(x) : _OSSwapInt16(x)))
73
74#define __DARWIN_OSSwapInt32(x) \
75    (__builtin_constant_p(x) ? __DARWIN_OSSwapConstInt32(x) : _OSSwapInt32(x))
76
77#define __DARWIN_OSSwapInt64(x) \
78    (__builtin_constant_p(x) ? __DARWIN_OSSwapConstInt64(x) : _OSSwapInt64(x))
79
80#else /* ! __GNUC__ */
81
82#if defined(__i386__) || defined(__x86_64__)
83
84#if !defined(__DARWIN_OS_INLINE)
85# if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
86#        define __DARWIN_OS_INLINE static inline
87# elif defined(__MWERKS__) || defined(__cplusplus)
88#        define __DARWIN_OS_INLINE static inline
89# else
90#        define __DARWIN_OS_INLINE static __inline__
91# endif
92#endif
93
94__DARWIN_OS_INLINE
95uint16_t
96_OSSwapInt16(
97    uint16_t			data
98)
99{
100    return __DARWIN_OSSwapConstInt16(data);
101}
102
103__DARWIN_OS_INLINE
104uint32_t
105_OSSwapInt32(
106    uint32_t			data
107)
108{
109    return __DARWIN_OSSwapConstInt32(data);
110}
111
112__DARWIN_OS_INLINE
113uint64_t
114_OSSwapInt64(
115    uint64_t			data
116)
117{
118    return __DARWIN_OSSwapConstInt64(data);
119}
120#endif
121
122#define __DARWIN_OSSwapInt16(x) _OSSwapInt16(x)
123
124#define __DARWIN_OSSwapInt32(x) _OSSwapInt32(x)
125
126#define __DARWIN_OSSwapInt64(x) _OSSwapInt64(x)
127
128#endif /* __GNUC__ */
129
130#endif /* ! _OS__OSBYTEORDER_H */
131