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 #define __DARWIN_OSSwapInt16(x) \
66 ((__uint16_t)(__builtin_constant_p(x) ? __DARWIN_OSSwapConstInt16(x) : _OSSwapInt16(x)))
67
68 #define __DARWIN_OSSwapInt32(x) \
69 (__builtin_constant_p(x) ? __DARWIN_OSSwapConstInt32(x) : _OSSwapInt32(x))
70
71 #define __DARWIN_OSSwapInt64(x) \
72 (__builtin_constant_p(x) ? __DARWIN_OSSwapConstInt64(x) : _OSSwapInt64(x))
73
74 #else /* ! __GNUC__ */
75
76 #if defined(__i386__) || defined(__x86_64__)
77
78 #if !defined(__DARWIN_OS_INLINE)
79 # if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
80 # define __DARWIN_OS_INLINE static inline
81 # elif defined(__MWERKS__) || defined(__cplusplus)
82 # define __DARWIN_OS_INLINE static inline
83 # else
84 # define __DARWIN_OS_INLINE static __inline__
85 # endif
86 #endif
87 #endif
88
89 #define __DARWIN_OSSwapInt16(x) _OSSwapInt16(x)
90
91 #define __DARWIN_OSSwapInt32(x) _OSSwapInt32(x)
92
93 #define __DARWIN_OSSwapInt64(x) _OSSwapInt64(x)
94
95 #endif /* __GNUC__ */
96
97 static inline
98 uint16_t
_OSSwapInt16(uint16_t data)99 _OSSwapInt16(
100 uint16_t data
101 )
102 {
103 return __DARWIN_OSSwapConstInt16(data);
104 }
105
106 static inline
107 uint32_t
_OSSwapInt32(uint32_t data)108 _OSSwapInt32(
109 uint32_t data
110 )
111 {
112 return __DARWIN_OSSwapConstInt32(data);
113 }
114
115 static inline
116 uint64_t
_OSSwapInt64(uint64_t data)117 _OSSwapInt64(
118 uint64_t data
119 )
120 {
121 return __DARWIN_OSSwapConstInt64(data);
122 }
123
124
125
126 #endif /* ! _OS__OSBYTEORDER_H */
127