libkern/libkern/_OSByteOrder.h

   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
  95 uint16_t
  96 _OSSwapInt16(
  97     uint16_t                    data
  98 )
  99 {
 100     return __DARWIN_OSSwapConstInt16(data);
 101 }
 102
 103 __DARWIN_OS_INLINE
 104 uint32_t
 105 _OSSwapInt32(
 106     uint32_t                    data
 107 )
 108 {
 109     return __DARWIN_OSSwapConstInt32(data);
 110 }
 111
 112 __DARWIN_OS_INLINE
 113 uint64_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 */