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Annotation of XNU/EXTERNAL_HEADERS/architecture/ppc/byte_order.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /*
        !            23:  * Copyright (c) 1996 NeXT Software, Inc.
        !            24:  *
        !            25:  * Byte ordering conversion (for ppc).
        !            26:  *
        !            27:  * HISTORY
        !            28:  *
        !            29:  * 29-Dec-96  Umesh Vaishampayan  ([email protected])
        !            30:  *     Ported from m98k.
        !            31:  *
        !            32:  * 8 October 1992 ? at NeXT
        !            33:  *     Converted to NXxxx versions.  Condensed history.
        !            34:  *
        !            35:  * 28 August 1992 Bruce Martin @NeXT
        !            36:  *     Created.
        !            37:  */
        !            38: 
        !            39: static __inline__
        !            40: unsigned short
        !            41: NXSwapShort(
        !            42:     unsigned short     inv
        !            43: )
        !            44: {
        !            45:     union sconv {
        !            46:        unsigned short  us;
        !            47:        unsigned char   uc[2];
        !            48:     } *inp, outv;
        !            49:     
        !            50:     inp = (union sconv *)&inv;
        !            51:     
        !            52:     outv.uc[0] = inp->uc[1];
        !            53:     outv.uc[1] = inp->uc[0];
        !            54:     
        !            55:     return (outv.us);
        !            56: }
        !            57: 
        !            58: static __inline__
        !            59: unsigned int
        !            60: NXSwapInt(
        !            61:     unsigned int       inv
        !            62: )
        !            63: {
        !            64:     union iconv {
        !            65:        unsigned int    ui;
        !            66:        unsigned char   uc[4];
        !            67:     } *inp, outv;
        !            68:     
        !            69:     inp = (union iconv *)&inv;
        !            70:     
        !            71:     outv.uc[0] = inp->uc[3];
        !            72:     outv.uc[1] = inp->uc[2];
        !            73:     outv.uc[2] = inp->uc[1];
        !            74:     outv.uc[3] = inp->uc[0];
        !            75:     
        !            76:     return (outv.ui);
        !            77: }
        !            78: 
        !            79: static __inline__
        !            80: unsigned long
        !            81: NXSwapLong(
        !            82:     unsigned long      inv
        !            83: )
        !            84: {
        !            85:     union lconv {
        !            86:        unsigned long   ul;
        !            87:        unsigned char   uc[4];
        !            88:     } *inp, outv;
        !            89:     
        !            90:     inp = (union lconv *)&inv;
        !            91:     
        !            92:     outv.uc[0] = inp->uc[3];
        !            93:     outv.uc[1] = inp->uc[2];
        !            94:     outv.uc[2] = inp->uc[1];
        !            95:     outv.uc[3] = inp->uc[0];
        !            96:     
        !            97:     return (outv.ul);
        !            98: }
        !            99: 
        !           100: static __inline__
        !           101: unsigned long long
        !           102: NXSwapLongLong(
        !           103:     unsigned long long inv
        !           104: )
        !           105: {
        !           106:     union llconv {
        !           107:        unsigned long long      ull;
        !           108:        unsigned char           uc[8];
        !           109:     } *inp, outv;
        !           110:     
        !           111:     inp = (union llconv *)&inv;
        !           112:     
        !           113:     outv.uc[0] = inp->uc[7];
        !           114:     outv.uc[1] = inp->uc[6];
        !           115:     outv.uc[2] = inp->uc[5];
        !           116:     outv.uc[3] = inp->uc[4];
        !           117:     outv.uc[4] = inp->uc[3];
        !           118:     outv.uc[5] = inp->uc[2];
        !           119:     outv.uc[6] = inp->uc[1];
        !           120:     outv.uc[7] = inp->uc[0];
        !           121:     
        !           122:     return (outv.ull);
        !           123: }
        !           124: 
        !           125: #ifndef KERNEL
        !           126: 
        !           127: static __inline__ NXSwappedFloat
        !           128: NXConvertHostFloatToSwapped(float x)
        !           129: {
        !           130:     union fconv {
        !           131:        float number;
        !           132:        NXSwappedFloat sf;
        !           133:     };
        !           134:     return ((union fconv *)&x)->sf;
        !           135: }
        !           136: 
        !           137: static __inline__ float
        !           138: NXConvertSwappedFloatToHost(NXSwappedFloat x)
        !           139: {
        !           140:     union fconv {
        !           141:        float number;
        !           142:        NXSwappedFloat sf;
        !           143:     };
        !           144:     return ((union fconv *)&x)->number;
        !           145: }
        !           146: 
        !           147: static __inline__ NXSwappedDouble
        !           148: NXConvertHostDoubleToSwapped(double x)
        !           149: {
        !           150:     union dconv {
        !           151:        double number;
        !           152:        NXSwappedDouble sd;
        !           153:     };
        !           154:     return ((union dconv *)&x)->sd;
        !           155: }
        !           156: 
        !           157: static __inline__ double
        !           158: NXConvertSwappedDoubleToHost(NXSwappedDouble x)
        !           159: {
        !           160:     union dconv {
        !           161:        double number;
        !           162:        NXSwappedDouble sd;
        !           163:     };
        !           164:     return ((union dconv *)&x)->number;
        !           165: }
        !           166: 
        !           167: static __inline__ NXSwappedFloat
        !           168: NXSwapFloat(NXSwappedFloat x)
        !           169: {
        !           170:     return NXSwapLong(x);
        !           171: }
        !           172: 
        !           173: static __inline__ NXSwappedDouble
        !           174: NXSwapDouble(NXSwappedDouble x)
        !           175: {
        !           176:     return NXSwapLongLong(x);
        !           177: }
        !           178: 
        !           179: #endif /* ! KERNEL */

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