assimp.assimp/code/ByteSwap.h

/*
Open Asset Import Library (ASSIMP)
----------------------------------------------------------------------

Copyright (c) 2006-2008, ASSIMP Development Team
All rights reserved.

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  copyright notice, this list of conditions and the
  following disclaimer.

* Redistributions in binary form must reproduce the above
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  following disclaimer in the documentation and/or other
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  written permission of the ASSIMP Development Team.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
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*/

/** @file Helper class tp perform various byte oder swappings 
   (e.g. little to big endian) */
#ifndef AI_BYTESWAP_H_INC
#define AI_BYTESWAP_H_INC

#include "../include/aiAssert.h"

namespace Assimp
{

// ---------------------------------------------------------------------------
/** \brief Defines some useful byte order swap routines.
 * 
 * This can e.g. be used for the conversion from and to littel and big endian.
 * This is required by some loaders since some model formats
 */
class ByteSwap
{
	ByteSwap() {}

public:
	//! Swap the byte oder of 2 byte of data
	//! \param szOut Buffer to be swapped
	static inline void Swap2(char* szOut)
	{
		ai_assert(NULL != szOut);
		std::swap(szOut[0],szOut[1]);
	}

	//! Swap the byte oder of 4 byte of data
	//! \param szOut Buffer to be swapped
	static inline void Swap4(char* szOut)
	{
		ai_assert(NULL != szOut);
		std::swap(szOut[0],szOut[3]);
		std::swap(szOut[1],szOut[2]);
	}

	//! Swap the byte oder of 8 byte of data
	//! \param szOut Buffer to be swapped
	static inline void Swap8(char* szOut)
	{
		ai_assert(NULL != szOut);
		std::swap(szOut[0],szOut[7]);
		std::swap(szOut[1],szOut[6]);
		std::swap(szOut[2],szOut[5]);
		std::swap(szOut[3],szOut[4]);
	}

	//! Swap a single precision float
	//! \param fOut Float value to be swapped
	static inline void Swap(float* fOut)
	{
		Swap4((char*)fOut);
	}

	//! Swap a double precision float
	//! \param fOut Double value to be swapped
	static inline void Swap(double* fOut)
	{
		Swap8((char*)fOut);
	}

	//! Swap a 16 bit integer
	//! \param fOut Integer to be swapped
	static inline void Swap(int16_t* fOut)
	{
		Swap2((char*)fOut);
	}

	//! Swap a 32 bit integer
	//! \param fOut Integer to be swapped
	static inline void Swap(int32_t* fOut)	
	{
		Swap4((char*)fOut);
	}

	//! Swap a 64 bit integer
	//! \param fOut Integer to be swapped
	static inline void Swap(int64_t* fOut)
	{
		Swap8((char*)fOut);
	}
};
};


#endif //!! AI_BYTESWAP_H_INC