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