OW_ByteSwap.hpp

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00001 /*******************************************************************************
00002 * Copyright (C) 2001-2004 Vintela, Inc. All rights reserved.
00003 *
00004 * Redistribution and use in source and binary forms, with or without
00005 * modification, are permitted provided that the following conditions are met:
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00007 *  - Redistributions of source code must retain the above copyright notice,
00008 *    this list of conditions and the following disclaimer.
00009 *
00010 *  - Redistributions in binary form must reproduce the above copyright notice,
00011 *    this list of conditions and the following disclaimer in the documentation
00012 *    and/or other materials provided with the distribution.
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00014 *  - Neither the name of Vintela, Inc. nor the names of its
00015 *    contributors may be used to endorse or promote products derived from this
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00018 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
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00030 
00035 #ifndef OW_BYTE_SWAP_HPP_
00036 #define OW_BYTE_SWAP_HPP_
00037 #include "OW_config.h"
00038 #include "OW_Types.hpp"
00039 
00040 #if !defined(OW_WORDS_BIGENDIAN) && defined(OW_HAVE_BYTESWAP_H) && !defined(OW_DEBUG_MEMORY)
00041 #include <byteswap.h>
00042 #endif
00043 
00044 namespace OW_NAMESPACE
00045 {
00046 
00047 // this will be defined by the configure script.
00048 #ifndef OW_WORDS_BIGENDIAN
00049 #if defined(OW_HAVE_BYTESWAP_H) && !defined(OW_DEBUG_MEMORY)
00050 
00051 inline UInt16 hton16(UInt16 v) { return __bswap_16(v); }
00052 inline UInt32 hton32(UInt32 v) { return __bswap_32(v); }
00053 inline UInt64 hton64(UInt64 v) { return __bswap_64(v); }
00054 inline UInt16 ntoh16(UInt16 v) { return __bswap_16(v); }
00055 inline UInt32 ntoh32(UInt32 v) { return __bswap_32(v); }
00056 inline UInt64 ntoh64(UInt64 v) { return __bswap_64(v); }
00057 #else
00058 inline UInt16 hton16(UInt16 v)
00059 {
00060    UInt16 rval;
00061    (reinterpret_cast<unsigned char*>(&rval))[1] = (reinterpret_cast<unsigned char*>(&v))[0];
00062    (reinterpret_cast<unsigned char*>(&rval))[0] = (reinterpret_cast<unsigned char*>(&v))[1];
00063    return rval;
00064 }
00065 inline UInt32 hton32(UInt32 v)
00066 {
00067    UInt32 rval;
00068    (reinterpret_cast<unsigned char*>(&rval))[3] = (reinterpret_cast<unsigned char*>(&v))[0];
00069    (reinterpret_cast<unsigned char*>(&rval))[2] = (reinterpret_cast<unsigned char*>(&v))[1];
00070    (reinterpret_cast<unsigned char*>(&rval))[1] = (reinterpret_cast<unsigned char*>(&v))[2];
00071    (reinterpret_cast<unsigned char*>(&rval))[0] = (reinterpret_cast<unsigned char*>(&v))[3];
00072    return rval;
00073 }
00074 inline UInt64 hton64(UInt64 v)
00075 {
00076    UInt64 rval;
00077    (reinterpret_cast<unsigned char*>(&rval))[7] = (reinterpret_cast<unsigned char*>(&v))[0];
00078    (reinterpret_cast<unsigned char*>(&rval))[6] = (reinterpret_cast<unsigned char*>(&v))[1];
00079    (reinterpret_cast<unsigned char*>(&rval))[5] = (reinterpret_cast<unsigned char*>(&v))[2];
00080    (reinterpret_cast<unsigned char*>(&rval))[4] = (reinterpret_cast<unsigned char*>(&v))[3];
00081    (reinterpret_cast<unsigned char*>(&rval))[3] = (reinterpret_cast<unsigned char*>(&v))[4];
00082    (reinterpret_cast<unsigned char*>(&rval))[2] = (reinterpret_cast<unsigned char*>(&v))[5];
00083    (reinterpret_cast<unsigned char*>(&rval))[1] = (reinterpret_cast<unsigned char*>(&v))[6];
00084    (reinterpret_cast<unsigned char*>(&rval))[0] = (reinterpret_cast<unsigned char*>(&v))[7];
00085    return rval;
00086 }
00087 inline UInt16 ntoh16(UInt16 v)
00088 {
00089    return hton16(v);
00090 }
00091 inline UInt32 ntoh32(UInt32 v)
00092 {
00093    return hton32(v);
00094 }
00095 inline UInt64 ntoh64(UInt64 v)
00096 {
00097    return hton64(v);
00098 }
00099 #endif
00100 #else // we're big-endian, just pass-thru
00101 inline UInt16 hton16(UInt16 v) { return v; }
00102 inline UInt32 hton32(UInt32 v) { return v; }
00103 inline UInt64 hton64(UInt64 v) { return v; }
00104 inline UInt16 ntoh16(UInt16 v) { return v; }
00105 inline UInt32 ntoh32(UInt32 v) { return v; }
00106 inline UInt64 ntoh64(UInt64 v) { return v; }
00107 #endif
00108 
00109 } // end namespace OW_NAMESPACE
00110 
00111 #endif

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