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_OSByteOrder.h (3989B) - Raw

      1 /*
      2  * Copyright (c) 2006-2023 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 #include <sys/_types.h>
     33 
     34 /* Macros for swapping constant values in the preprocessing stage. */
     35 #define __DARWIN_OSSwapConstInt16(x) \
     36     ((__uint16_t)((((__uint16_t)(x) & 0xff00U) >> 8) | \
     37 	        (((__uint16_t)(x) & 0x00ffU) << 8)))
     38 
     39 #define __DARWIN_OSSwapConstInt32(x) \
     40     ((__uint32_t)((((__uint32_t)(x) & 0xff000000U) >> 24) | \
     41 	        (((__uint32_t)(x) & 0x00ff0000U) >>  8) | \
     42 	        (((__uint32_t)(x) & 0x0000ff00U) <<  8) | \
     43 	        (((__uint32_t)(x) & 0x000000ffU) << 24)))
     44 
     45 #define __DARWIN_OSSwapConstInt64(x) \
     46     ((__uint64_t)((((__uint64_t)(x) & 0xff00000000000000ULL) >> 56) | \
     47 	        (((__uint64_t)(x) & 0x00ff000000000000ULL) >> 40) | \
     48 	        (((__uint64_t)(x) & 0x0000ff0000000000ULL) >> 24) | \
     49 	        (((__uint64_t)(x) & 0x000000ff00000000ULL) >>  8) | \
     50 	        (((__uint64_t)(x) & 0x00000000ff000000ULL) <<  8) | \
     51 	        (((__uint64_t)(x) & 0x0000000000ff0000ULL) << 24) | \
     52 	        (((__uint64_t)(x) & 0x000000000000ff00ULL) << 40) | \
     53 	        (((__uint64_t)(x) & 0x00000000000000ffULL) << 56)))
     54 
     55 #if defined(__GNUC__)
     56 
     57 #if defined(__i386__) || defined(__x86_64__)
     58 #include <libkern/i386/_OSByteOrder.h>
     59 #endif
     60 
     61 #if defined (__arm__) || defined(__arm64__)
     62 #include <libkern/arm/_OSByteOrder.h>
     63 #endif
     64 
     65 
     66 #define __DARWIN_OSSwapInt16(x) \
     67     ((__uint16_t)(__builtin_constant_p(x) ? __DARWIN_OSSwapConstInt16(x) : _OSSwapInt16(x)))
     68 
     69 #define __DARWIN_OSSwapInt32(x) \
     70     (__builtin_constant_p(x) ? __DARWIN_OSSwapConstInt32(x) : _OSSwapInt32(x))
     71 
     72 #define __DARWIN_OSSwapInt64(x) \
     73     (__builtin_constant_p(x) ? __DARWIN_OSSwapConstInt64(x) : _OSSwapInt64(x))
     74 
     75 #else /* ! __GNUC__ */
     76 
     77 #if defined(__i386__) || defined(__x86_64__)
     78 
     79 #if !defined(__DARWIN_OS_INLINE)
     80 # if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
     81 #        define __DARWIN_OS_INLINE static inline
     82 # elif defined(__MWERKS__) || defined(__cplusplus)
     83 #        define __DARWIN_OS_INLINE static inline
     84 # else
     85 #        define __DARWIN_OS_INLINE static __inline__
     86 # endif
     87 #endif
     88 
     89 __DARWIN_OS_INLINE
     90 __uint16_t
     91 _OSSwapInt16(
     92 	__uint16_t                    data
     93 	)
     94 {
     95 	return __DARWIN_OSSwapConstInt16(data);
     96 }
     97 
     98 __DARWIN_OS_INLINE
     99 __uint32_t
    100 _OSSwapInt32(
    101 	__uint32_t                    data
    102 	)
    103 {
    104 	return __DARWIN_OSSwapConstInt32(data);
    105 }
    106 
    107 __DARWIN_OS_INLINE
    108 __uint64_t
    109 _OSSwapInt64(
    110 	__uint64_t                    data
    111 	)
    112 {
    113 	return __DARWIN_OSSwapConstInt64(data);
    114 }
    115 #endif
    116 
    117 #define __DARWIN_OSSwapInt16(x) _OSSwapInt16(x)
    118 
    119 #define __DARWIN_OSSwapInt32(x) _OSSwapInt32(x)
    120 
    121 #define __DARWIN_OSSwapInt64(x) _OSSwapInt64(x)
    122 
    123 #endif /* __GNUC__ */
    124 
    125 #endif /* ! _OS__OSBYTEORDER_H */