EXTERNAL_HEADERS/architecture/ppc/byte_order.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * Copyright (c) 1996 NeXT Software, Inc.
  27  *
  28  * Byte ordering conversion (for ppc).
  29  *
  30  * HISTORY
  31  *
  32  * 29-Dec-96  Umesh Vaishampayan  (umeshv@NeXT.com)
  33  *      Ported from m98k.
  34  *
  35  * 8 October 1992 ? at NeXT
  36  *      Converted to NXxxx versions.  Condensed history.
  37  *
  38  * 28 August 1992 Bruce Martin @NeXT
  39  *      Created.
  40  */
  41
  42 static __inline__
  43 unsigned short
  44 NXSwapShort(
  45     unsigned short      inv
  46 )
  47 {
  48     union sconv {
  49         unsigned short  us;
  50         unsigned char   uc[2];
  51     } *inp, outv;
  52
  53     inp = (union sconv *)&inv;
  54
  55     outv.uc[0] = inp->uc[1];
  56     outv.uc[1] = inp->uc[0];
  57
  58     return (outv.us);
  59 }
  60
  61 static __inline__
  62 unsigned int
  63 NXSwapInt(
  64     unsigned int        inv
  65 )
  66 {
  67     union iconv {
  68         unsigned int    ui;
  69         unsigned char   uc[4];
  70     } *inp, outv;
  71
  72     inp = (union iconv *)&inv;
  73
  74     outv.uc[0] = inp->uc[3];
  75     outv.uc[1] = inp->uc[2];
  76     outv.uc[2] = inp->uc[1];
  77     outv.uc[3] = inp->uc[0];
  78
  79     return (outv.ui);
  80 }
  81
  82 static __inline__
  83 unsigned long
  84 NXSwapLong(
  85     unsigned long       inv
  86 )
  87 {
  88     union lconv {
  89         unsigned long   ul;
  90         unsigned char   uc[4];
  91     } *inp, outv;
  92
  93     inp = (union lconv *)&inv;
  94
  95     outv.uc[0] = inp->uc[3];
  96     outv.uc[1] = inp->uc[2];
  97     outv.uc[2] = inp->uc[1];
  98     outv.uc[3] = inp->uc[0];
  99
 100     return (outv.ul);
 101 }
 102
 103 static __inline__
 104 unsigned long long
 105 NXSwapLongLong(
 106     unsigned long long  inv
 107 )
 108 {
 109     union llconv {
 110         unsigned long long      ull;
 111         unsigned char           uc[8];
 112     } *inp, outv;
 113
 114     inp = (union llconv *)&inv;
 115
 116     outv.uc[0] = inp->uc[7];
 117     outv.uc[1] = inp->uc[6];
 118     outv.uc[2] = inp->uc[5];
 119     outv.uc[3] = inp->uc[4];
 120     outv.uc[4] = inp->uc[3];
 121     outv.uc[5] = inp->uc[2];
 122     outv.uc[6] = inp->uc[1];
 123     outv.uc[7] = inp->uc[0];
 124
 125     return (outv.ull);
 126 }
 127
 128 #ifndef KERNEL
 129
 130 static __inline__ NXSwappedFloat
 131 NXConvertHostFloatToSwapped(float x)
 132 {
 133     union fconv {
 134         float number;
 135         NXSwappedFloat sf;
 136     };
 137     return ((union fconv *)&x)->sf;
 138 }
 139
 140 static __inline__ float
 141 NXConvertSwappedFloatToHost(NXSwappedFloat x)
 142 {
 143     union fconv {
 144         float number;
 145         NXSwappedFloat sf;
 146     };
 147     return ((union fconv *)&x)->number;
 148 }
 149
 150 static __inline__ NXSwappedDouble
 151 NXConvertHostDoubleToSwapped(double x)
 152 {
 153     union dconv {
 154         double number;
 155         NXSwappedDouble sd;
 156     };
 157     return ((union dconv *)&x)->sd;
 158 }
 159
 160 static __inline__ double
 161 NXConvertSwappedDoubleToHost(NXSwappedDouble x)
 162 {
 163     union dconv {
 164         double number;
 165         NXSwappedDouble sd;
 166     };
 167     return ((union dconv *)&x)->number;
 168 }
 169
 170 static __inline__ NXSwappedFloat
 171 NXSwapFloat(NXSwappedFloat x)
 172 {
 173     return NXSwapLong(x);
 174 }
 175
 176 static __inline__ NXSwappedDouble
 177 NXSwapDouble(NXSwappedDouble x)
 178 {
 179     return NXSwapLongLong(x);
 180 }
 181
 182 #endif /* ! KERNEL */