FreeBSD/Linux Kernel Cross Reference
sys/libkern/libkern/_OSByteOrder.h

     /*
      * Copyright (c) 2006 Apple Computer, Inc. All rights reserved.
      *
      * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
      * 
      * This file contains Original Code and/or Modifications of Original Code
      * as defined in and that are subject to the Apple Public Source License
      * Version 2.0 (the 'License'). You may not use this file except in
      * compliance with the License. The rights granted to you under the License
     * may not be used to create, or enable the creation or redistribution of,
     * unlawful or unlicensed copies of an Apple operating system, or to
     * circumvent, violate, or enable the circumvention or violation of, any
     * terms of an Apple operating system software license agreement.
     * 
     * Please obtain a copy of the License at
     * http://www.opensource.apple.com/apsl/ and read it before using this file.
     * 
     * The Original Code and all software distributed under the License are
     * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
     * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
     * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
     * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
     * Please see the License for the specific language governing rights and
     * limitations under the License.
     * 
     * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
     */
    
    #ifndef _OS__OSBYTEORDER_H
    #define _OS__OSBYTEORDER_H
    
    /*
     * This header is normally included from <libkern/OSByteOrder.h>.  However,
     * <sys/_endian.h> also includes this in the case of little-endian
     * architectures, so that we can map OSByteOrder routines to the hton* and ntoh*
     * macros.  This results in the asymmetry below; we only include
     * <libkern/arch/_OSByteOrder.h> for little-endian architectures.
     */
    
    #include <sys/_types.h>
    
    /* Macros for swapping constant values in the preprocessing stage. */
    #define __DARWIN_OSSwapConstInt16(x) \
        ((__uint16_t)((((__uint16_t)(x) & 0xff00) >> 8) | \
                    (((__uint16_t)(x) & 0x00ff) << 8)))
    
    #define __DARWIN_OSSwapConstInt32(x) \
        ((__uint32_t)((((__uint32_t)(x) & 0xff000000) >> 24) | \
                    (((__uint32_t)(x) & 0x00ff0000) >>  8) | \
                    (((__uint32_t)(x) & 0x0000ff00) <<  8) | \
                    (((__uint32_t)(x) & 0x000000ff) << 24)))
    
    #define __DARWIN_OSSwapConstInt64(x) \
        ((__uint64_t)((((__uint64_t)(x) & 0xff00000000000000ULL) >> 56) | \
                    (((__uint64_t)(x) & 0x00ff000000000000ULL) >> 40) | \
                    (((__uint64_t)(x) & 0x0000ff0000000000ULL) >> 24) | \
                    (((__uint64_t)(x) & 0x000000ff00000000ULL) >>  8) | \
                    (((__uint64_t)(x) & 0x00000000ff000000ULL) <<  8) | \
                    (((__uint64_t)(x) & 0x0000000000ff0000ULL) << 24) | \
                    (((__uint64_t)(x) & 0x000000000000ff00ULL) << 40) | \
                    (((__uint64_t)(x) & 0x00000000000000ffULL) << 56)))
    
    #if defined(__GNUC__)
    
    #if defined(__i386__) || defined(__x86_64__)
    #include <libkern/i386/_OSByteOrder.h>
    #endif
    
    
    
    #define __DARWIN_OSSwapInt16(x) \
        (__builtin_constant_p(x) ? __DARWIN_OSSwapConstInt16(x) : _OSSwapInt16(x))
    
    #define __DARWIN_OSSwapInt32(x) \
        (__builtin_constant_p(x) ? __DARWIN_OSSwapConstInt32(x) : _OSSwapInt32(x))
    
    #define __DARWIN_OSSwapInt64(x) \
        (__builtin_constant_p(x) ? __DARWIN_OSSwapConstInt64(x) : _OSSwapInt64(x))
    
    #else /* ! __GNUC__ */
    
    #if defined(__i386__) || defined(__x86_64__)
    
    #if !defined(__DARWIN_OS_INLINE)
    # if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
    #        define __DARWIN_OS_INLINE static inline
    # elif defined(__MWERKS__) || defined(__cplusplus)
    #        define __DARWIN_OS_INLINE static inline
    # else
    #        define __DARWIN_OS_INLINE static __inline__
    # endif
    #endif
    
    __DARWIN_OS_INLINE
    uint16_t
    _OSSwapInt16(
        uint16_t                    data
    )
    {
       return __DARWIN_OSSwapConstInt16(data);
   }
   
   __DARWIN_OS_INLINE
   uint32_t
   _OSSwapInt32(
       uint32_t                    data
   )
   {
       return __DARWIN_OSSwapConstInt32(data);
   }
   
   __DARWIN_OS_INLINE
   uint64_t
   _OSSwapInt64(
       uint64_t                    data
   )
   {
       return __DARWIN_OSSwapConstInt64(data);
   }
   #endif
   
   #define __DARWIN_OSSwapInt16(x) _OSSwapInt16(x)
   
   #define __DARWIN_OSSwapInt32(x) _OSSwapInt32(x)
   
   #define __DARWIN_OSSwapInt64(x) _OSSwapInt64(x)
   
   #endif /* __GNUC__ */
   
   #endif /* ! _OS__OSBYTEORDER_H */

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