blocxx

ByteSwap.hpp

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00001 /*******************************************************************************
00002 * Copyright (C) 2005, Vintela, Inc. All rights reserved.
00003 * Copyright (C) 2006, Novell, Inc. All rights reserved.
00004 * 
00005 * Redistribution and use in source and binary forms, with or without
00006 * modification, are permitted provided that the following conditions are met:
00007 * 
00008 *     * Redistributions of source code must retain the above copyright notice,
00009 *       this list of conditions and the following disclaimer.
00010 *     * Redistributions in binary form must reproduce the above copyright
00011 *       notice, this list of conditions and the following disclaimer in the
00012 *       documentation and/or other materials provided with the distribution.
00013 *     * Neither the name of 
00014 *       Vintela, Inc., 
00015 *       nor Novell, Inc., 
00016 *       nor the names of its contributors or employees may be used to 
00017 *       endorse or promote products derived from this software without 
00018 *       specific prior written permission.
00019 * 
00020 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
00021 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00022 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00023 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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00026 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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00032 
00033 
00038 #ifndef BLOCXX_BYTE_SWAP_HPP_
00039 #define BLOCXX_BYTE_SWAP_HPP_
00040 #include "blocxx/BLOCXX_config.h"
00041 #include "blocxx/Types.hpp"
00042 
00043 #if !defined(BLOCXX_WORDS_BIGENDIAN) && defined(BLOCXX_HAVE_BYTESWAP_H) && !defined(BLOCXX_DEBUG_MEMORY)
00044 #include <byteswap.h>
00045 #endif
00046 
00047 namespace BLOCXX_NAMESPACE
00048 {
00049 
00050 // this will be defined by the configure script.
00051 #ifndef BLOCXX_WORDS_BIGENDIAN
00052 #if defined(BLOCXX_HAVE_BYTESWAP_H) && !defined(BLOCXX_DEBUG_MEMORY)
00053 
00059 inline UInt16 hton16(UInt16 v) { return __bswap_16(v); }
00065 inline UInt32 hton32(UInt32 v) { return __bswap_32(v); }
00071 inline UInt64 hton64(UInt64 v) { return __bswap_64(v); }
00077 inline UInt16 ntoh16(UInt16 v) { return __bswap_16(v); }
00083 inline UInt32 ntoh32(UInt32 v) { return __bswap_32(v); }
00089 inline UInt64 ntoh64(UInt64 v) { return __bswap_64(v); }
00090 #else
00091 inline UInt16 hton16(UInt16 v)
00092 {
00093    UInt16 rval;
00094    (reinterpret_cast<unsigned char*>(&rval))[1] = (reinterpret_cast<unsigned char*>(&v))[0];
00095    (reinterpret_cast<unsigned char*>(&rval))[0] = (reinterpret_cast<unsigned char*>(&v))[1];
00096    return rval;
00097 }
00098 inline UInt32 hton32(UInt32 v)
00099 {
00100    UInt32 rval;
00101    (reinterpret_cast<unsigned char*>(&rval))[3] = (reinterpret_cast<unsigned char*>(&v))[0];
00102    (reinterpret_cast<unsigned char*>(&rval))[2] = (reinterpret_cast<unsigned char*>(&v))[1];
00103    (reinterpret_cast<unsigned char*>(&rval))[1] = (reinterpret_cast<unsigned char*>(&v))[2];
00104    (reinterpret_cast<unsigned char*>(&rval))[0] = (reinterpret_cast<unsigned char*>(&v))[3];
00105    return rval;
00106 }
00107 inline UInt64 hton64(UInt64 v)
00108 {
00109    UInt64 rval;
00110    (reinterpret_cast<unsigned char*>(&rval))[7] = (reinterpret_cast<unsigned char*>(&v))[0];
00111    (reinterpret_cast<unsigned char*>(&rval))[6] = (reinterpret_cast<unsigned char*>(&v))[1];
00112    (reinterpret_cast<unsigned char*>(&rval))[5] = (reinterpret_cast<unsigned char*>(&v))[2];
00113    (reinterpret_cast<unsigned char*>(&rval))[4] = (reinterpret_cast<unsigned char*>(&v))[3];
00114    (reinterpret_cast<unsigned char*>(&rval))[3] = (reinterpret_cast<unsigned char*>(&v))[4];
00115    (reinterpret_cast<unsigned char*>(&rval))[2] = (reinterpret_cast<unsigned char*>(&v))[5];
00116    (reinterpret_cast<unsigned char*>(&rval))[1] = (reinterpret_cast<unsigned char*>(&v))[6];
00117    (reinterpret_cast<unsigned char*>(&rval))[0] = (reinterpret_cast<unsigned char*>(&v))[7];
00118    return rval;
00119 }
00120 inline UInt16 ntoh16(UInt16 v)
00121 {
00122    return hton16(v);
00123 }
00124 inline UInt32 ntoh32(UInt32 v)
00125 {
00126    return hton32(v);
00127 }
00128 inline UInt64 ntoh64(UInt64 v)
00129 {
00130    return hton64(v);
00131 }
00132 #endif
00133 #else // we're big-endian, just pass-thru
00134 inline UInt16 hton16(UInt16 v) { return v; }
00135 inline UInt32 hton32(UInt32 v) { return v; }
00136 inline UInt64 hton64(UInt64 v) { return v; }
00137 inline UInt16 ntoh16(UInt16 v) { return v; }
00138 inline UInt32 ntoh32(UInt32 v) { return v; }
00139 inline UInt64 ntoh64(UInt64 v) { return v; }
00140 #endif
00141 
00142 } // end namespace BLOCXX_NAMESPACE
00143 
00144 #endif