ByteSwap.hpp

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* Copyright (C) 2005, Vintela, Inc. All rights reserved.
* Copyright (C) 2006, Novell, Inc. All rights reserved.
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#ifndef BLOCXX_BYTE_SWAP_HPP_
#define BLOCXX_BYTE_SWAP_HPP_
#include "blocxx/BLOCXX_config.h"
#include "blocxx/Types.hpp"
 
#if !defined(BLOCXX_WORDS_BIGENDIAN) && defined(BLOCXX_HAVE_BYTESWAP_H) && !defined(BLOCXX_DEBUG_MEMORY)
#include <byteswap.h>
#endif
 
namespace BLOCXX_NAMESPACE
{
 
// this will be defined by the configure script.
#ifndef BLOCXX_WORDS_BIGENDIAN
#if defined(BLOCXX_HAVE_BYTESWAP_H) && !defined(BLOCXX_DEBUG_MEMORY)
 
inline UInt16 hton16(UInt16 v) { return __bswap_16(v); }
inline UInt32 hton32(UInt32 v) { return __bswap_32(v); }
inline UInt64 hton64(UInt64 v) { return __bswap_64(v); }
inline UInt16 ntoh16(UInt16 v) { return __bswap_16(v); }
inline UInt32 ntoh32(UInt32 v) { return __bswap_32(v); }
inline UInt64 ntoh64(UInt64 v) { return __bswap_64(v); }
#else
inline UInt16 hton16(UInt16 v)
{
   UInt16 rval;
   (reinterpret_cast<unsigned char*>(&rval))[1] = (reinterpret_cast<unsigned char*>(&v))[0];
   (reinterpret_cast<unsigned char*>(&rval))[0] = (reinterpret_cast<unsigned char*>(&v))[1];
   return rval;
}
inline UInt32 hton32(UInt32 v)
{
   UInt32 rval;
   (reinterpret_cast<unsigned char*>(&rval))[3] = (reinterpret_cast<unsigned char*>(&v))[0];
   (reinterpret_cast<unsigned char*>(&rval))[2] = (reinterpret_cast<unsigned char*>(&v))[1];
   (reinterpret_cast<unsigned char*>(&rval))[1] = (reinterpret_cast<unsigned char*>(&v))[2];
   (reinterpret_cast<unsigned char*>(&rval))[0] = (reinterpret_cast<unsigned char*>(&v))[3];
   return rval;
}
inline UInt64 hton64(UInt64 v)
{
   UInt64 rval;
   (reinterpret_cast<unsigned char*>(&rval))[7] = (reinterpret_cast<unsigned char*>(&v))[0];
   (reinterpret_cast<unsigned char*>(&rval))[6] = (reinterpret_cast<unsigned char*>(&v))[1];
   (reinterpret_cast<unsigned char*>(&rval))[5] = (reinterpret_cast<unsigned char*>(&v))[2];
   (reinterpret_cast<unsigned char*>(&rval))[4] = (reinterpret_cast<unsigned char*>(&v))[3];
   (reinterpret_cast<unsigned char*>(&rval))[3] = (reinterpret_cast<unsigned char*>(&v))[4];
   (reinterpret_cast<unsigned char*>(&rval))[2] = (reinterpret_cast<unsigned char*>(&v))[5];
   (reinterpret_cast<unsigned char*>(&rval))[1] = (reinterpret_cast<unsigned char*>(&v))[6];
   (reinterpret_cast<unsigned char*>(&rval))[0] = (reinterpret_cast<unsigned char*>(&v))[7];
   return rval;
}
inline UInt16 ntoh16(UInt16 v)
{
   return hton16(v);
}
inline UInt32 ntoh32(UInt32 v)
{
   return hton32(v);
}
inline UInt64 ntoh64(UInt64 v)
{
   return hton64(v);
}
#endif
#else // we're big-endian, just pass-thru
inline UInt16 hton16(UInt16 v) { return v; }
inline UInt32 hton32(UInt32 v) { return v; }
inline UInt64 hton64(UInt64 v) { return v; }
inline UInt16 ntoh16(UInt16 v) { return v; }
inline UInt32 ntoh32(UInt32 v) { return v; }
inline UInt64 ntoh64(UInt64 v) { return v; }
#endif
 
} // end namespace BLOCXX_NAMESPACE
 
#endif