nuclear@0: /*
nuclear@0: Open Asset Import Library (assimp)
nuclear@0: ----------------------------------------------------------------------
nuclear@0: 
nuclear@0: Copyright (c) 2006-2012, assimp team
nuclear@0: All rights reserved.
nuclear@0: 
nuclear@0: Redistribution and use of this software in source and binary forms, 
nuclear@0: with or without modification, are permitted provided that the 
nuclear@0: following conditions are met:
nuclear@0: 
nuclear@0: * Redistributions of source code must retain the above
nuclear@0:   copyright notice, this list of conditions and the
nuclear@0:   following disclaimer.
nuclear@0: 
nuclear@0: * Redistributions in binary form must reproduce the above
nuclear@0:   copyright notice, this list of conditions and the
nuclear@0:   following disclaimer in the documentation and/or other
nuclear@0:   materials provided with the distribution.
nuclear@0: 
nuclear@0: * Neither the name of the assimp team, nor the names of its
nuclear@0:   contributors may be used to endorse or promote products
nuclear@0:   derived from this software without specific prior
nuclear@0:   written permission of the assimp team.
nuclear@0: 
nuclear@0: THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
nuclear@0: "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
nuclear@0: LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
nuclear@0: A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 
nuclear@0: OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
nuclear@0: SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
nuclear@0: LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
nuclear@0: DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
nuclear@0: THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
nuclear@0: (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
nuclear@0: OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
nuclear@0: 
nuclear@0: ----------------------------------------------------------------------
nuclear@0: */
nuclear@0: 
nuclear@0: /** @file Helper class tp perform various byte oder swappings 
nuclear@0:    (e.g. little to big endian) */
nuclear@0: #ifndef AI_BYTESWAP_H_INC
nuclear@0: #define AI_BYTESWAP_H_INC
nuclear@0: 
nuclear@0: #include "assimp/ai_assert.h"
nuclear@0: #include "assimp/types.h"
nuclear@0: 
nuclear@0: #if _MSC_VER >= 1400 
nuclear@0: #include <stdlib.h>
nuclear@0: #endif
nuclear@0: 
nuclear@0: namespace Assimp	{
nuclear@0: // --------------------------------------------------------------------------------------
nuclear@0: /** Defines some useful byte order swap routines.
nuclear@0:  * 
nuclear@0:  * This is required to read big-endian model formats on little-endian machines,
nuclear@0:  * and vice versa. Direct use of this class is DEPRECATED. Use #StreamReader instead. */
nuclear@0: // --------------------------------------------------------------------------------------
nuclear@0: class ByteSwap
nuclear@0: {
nuclear@0: 	ByteSwap() {}
nuclear@0: 
nuclear@0: public:
nuclear@0: 
nuclear@0: 	// ----------------------------------------------------------------------
nuclear@0: 	/** Swap two bytes of data
nuclear@0: 	 *  @param[inout] _szOut A void* to save the reintcasts for the caller. */
nuclear@0: 	static inline void Swap2(void* _szOut)
nuclear@0: 	{
nuclear@0: 		ai_assert(_szOut);
nuclear@0: 
nuclear@0: #if _MSC_VER >= 1400
nuclear@0: 		uint16_t* const szOut = reinterpret_cast<uint16_t*>(_szOut);
nuclear@0: 		*szOut = _byteswap_ushort(*szOut);
nuclear@0: #else
nuclear@0: 		uint8_t* const szOut = reinterpret_cast<uint8_t*>(_szOut);
nuclear@0: 		std::swap(szOut[0],szOut[1]);
nuclear@0: #endif
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	// ----------------------------------------------------------------------
nuclear@0: 	/** Swap four bytes of data
nuclear@0: 	 *  @param[inout] _szOut A void* to save the reintcasts for the caller. */
nuclear@0: 	static inline void Swap4(void* _szOut)
nuclear@0: 	{
nuclear@0: 		ai_assert(_szOut);
nuclear@0: 
nuclear@0: #if _MSC_VER >= 1400
nuclear@0: 		uint32_t* const szOut = reinterpret_cast<uint32_t*>(_szOut);
nuclear@0: 		*szOut = _byteswap_ulong(*szOut);
nuclear@0: #else
nuclear@0: 		uint8_t* const szOut = reinterpret_cast<uint8_t*>(_szOut);
nuclear@0: 		std::swap(szOut[0],szOut[3]);
nuclear@0: 		std::swap(szOut[1],szOut[2]);
nuclear@0: #endif
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	// ----------------------------------------------------------------------
nuclear@0: 	/** Swap eight bytes of data
nuclear@0: 	 *  @param[inout] _szOut A void* to save the reintcasts for the caller. */
nuclear@0: 	static inline void Swap8(void* _szOut)
nuclear@0: 	{
nuclear@0: 	ai_assert(_szOut);
nuclear@0: 
nuclear@0: #if _MSC_VER >= 1400
nuclear@0: 		uint64_t* const szOut = reinterpret_cast<uint64_t*>(_szOut);
nuclear@0: 		*szOut = _byteswap_uint64(*szOut);
nuclear@0: #else
nuclear@0: 		uint8_t* const szOut = reinterpret_cast<uint8_t*>(_szOut);
nuclear@0: 		std::swap(szOut[0],szOut[7]);
nuclear@0: 		std::swap(szOut[1],szOut[6]);
nuclear@0: 		std::swap(szOut[2],szOut[5]);
nuclear@0: 		std::swap(szOut[3],szOut[4]);
nuclear@0: #endif
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	// ----------------------------------------------------------------------
nuclear@0: 	/** ByteSwap a float. Not a joke.
nuclear@0: 	 *  @param[inout] fOut ehm. .. */
nuclear@0: 	static inline void Swap(float* fOut) {
nuclear@0: 		Swap4(fOut);
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	// ----------------------------------------------------------------------
nuclear@0: 	/** ByteSwap a double. Not a joke.
nuclear@0: 	 *  @param[inout] fOut ehm. .. */
nuclear@0: 	static inline void Swap(double* fOut) {
nuclear@0: 		Swap8(fOut);
nuclear@0: 	}
nuclear@0: 
nuclear@0: 
nuclear@0: 	// ----------------------------------------------------------------------
nuclear@0: 	/** ByteSwap an int16t. Not a joke.
nuclear@0: 	 *  @param[inout] fOut ehm. .. */
nuclear@0: 	static inline void Swap(int16_t* fOut) {
nuclear@0: 		Swap2(fOut);
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	static inline void Swap(uint16_t* fOut) {
nuclear@0: 		Swap2(fOut);
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	// ----------------------------------------------------------------------
nuclear@0: 	/** ByteSwap an int32t. Not a joke.
nuclear@0: 	 *  @param[inout] fOut ehm. .. */
nuclear@0: 	static inline void Swap(int32_t* fOut){
nuclear@0: 		Swap4(fOut);
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	static inline void Swap(uint32_t* fOut){
nuclear@0: 		Swap4(fOut);
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	// ----------------------------------------------------------------------
nuclear@0: 	/** ByteSwap an int64t. Not a joke.
nuclear@0: 	 *  @param[inout] fOut ehm. .. */
nuclear@0: 	static inline void Swap(int64_t* fOut) {
nuclear@0: 		Swap8(fOut);
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	static inline void Swap(uint64_t* fOut) {
nuclear@0: 		Swap8(fOut);
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	// ----------------------------------------------------------------------
nuclear@0: 	//! Templatized ByteSwap
nuclear@0: 	//! \returns param tOut as swapped
nuclear@0: 	template<typename Type> 
nuclear@0: 	static inline Type Swapped(Type tOut)
nuclear@0: 	{
nuclear@0: 		return _swapper<Type,sizeof(Type)>()(tOut);
nuclear@0: 	}
nuclear@0: 
nuclear@0: private:
nuclear@0: 
nuclear@0: 	template <typename T, size_t size> struct _swapper;
nuclear@0: };
nuclear@0: 
nuclear@0: template <typename T> struct ByteSwap::_swapper<T,2> {
nuclear@0: 	T operator() (T tOut) {
nuclear@0: 		Swap2(&tOut); 
nuclear@0: 		return tOut;
nuclear@0: 	}
nuclear@0: };
nuclear@0: 
nuclear@0: template <typename T> struct ByteSwap::_swapper<T,4> {
nuclear@0: 	T operator() (T tOut) {
nuclear@0: 		Swap4(&tOut); 
nuclear@0: 		return tOut;
nuclear@0: 	}
nuclear@0: };
nuclear@0: 
nuclear@0: template <typename T> struct ByteSwap::_swapper<T,8> {
nuclear@0: 	T operator() (T tOut) {
nuclear@0: 		Swap8(&tOut); 
nuclear@0: 		return tOut;
nuclear@0: 	}
nuclear@0: };
nuclear@0: 
nuclear@0: 
nuclear@0: // --------------------------------------------------------------------------------------
nuclear@0: // ByteSwap macros for BigEndian/LittleEndian support 
nuclear@0: // --------------------------------------------------------------------------------------
nuclear@0: #if (defined AI_BUILD_BIG_ENDIAN)
nuclear@0: #	define AI_LE(t)	(t)
nuclear@0: #	define AI_BE(t) ByteSwap::Swapped(t)
nuclear@0: #	define AI_LSWAP2(p)
nuclear@0: #	define AI_LSWAP4(p)
nuclear@0: #	define AI_LSWAP8(p)
nuclear@0: #	define AI_LSWAP2P(p)
nuclear@0: #	define AI_LSWAP4P(p)
nuclear@0: #	define AI_LSWAP8P(p)
nuclear@0: #	define LE_NCONST const
nuclear@0: #	define AI_SWAP2(p) ByteSwap::Swap2(&(p))
nuclear@0: #	define AI_SWAP4(p) ByteSwap::Swap4(&(p))
nuclear@0: #	define AI_SWAP8(p) ByteSwap::Swap8(&(p))
nuclear@0: #	define AI_SWAP2P(p) ByteSwap::Swap2((p))
nuclear@0: #	define AI_SWAP4P(p) ByteSwap::Swap4((p))
nuclear@0: #	define AI_SWAP8P(p) ByteSwap::Swap8((p))
nuclear@0: #	define BE_NCONST
nuclear@0: #else
nuclear@0: #	define AI_BE(t)	(t)
nuclear@0: #	define AI_LE(t) ByteSwap::Swapped(t)
nuclear@0: #	define AI_SWAP2(p)
nuclear@0: #	define AI_SWAP4(p)
nuclear@0: #	define AI_SWAP8(p)
nuclear@0: #	define AI_SWAP2P(p)
nuclear@0: #	define AI_SWAP4P(p)
nuclear@0: #	define AI_SWAP8P(p)
nuclear@0: #	define BE_NCONST const
nuclear@0: #	define AI_LSWAP2(p)		ByteSwap::Swap2(&(p))
nuclear@0: #	define AI_LSWAP4(p)		ByteSwap::Swap4(&(p))
nuclear@0: #	define AI_LSWAP8(p)		ByteSwap::Swap8(&(p))
nuclear@0: #	define AI_LSWAP2P(p)	ByteSwap::Swap2((p))
nuclear@0: #	define AI_LSWAP4P(p)	ByteSwap::Swap4((p))
nuclear@0: #	define AI_LSWAP8P(p)	ByteSwap::Swap8((p))
nuclear@0: #	define LE_NCONST
nuclear@0: #endif
nuclear@0: 
nuclear@0: 
nuclear@0: namespace Intern {
nuclear@0: 
nuclear@0: // --------------------------------------------------------------------------------------------
nuclear@0: template <typename T, bool doit>
nuclear@0: struct ByteSwapper	{
nuclear@0: 	void operator() (T* inout) {
nuclear@0: 		ByteSwap::Swap(inout);
nuclear@0: 	}
nuclear@0: };
nuclear@0: 
nuclear@0: template <typename T> 
nuclear@0: struct ByteSwapper<T,false>	{
nuclear@0: 	void operator() (T*) {
nuclear@0: 	}
nuclear@0: };
nuclear@0: 
nuclear@0: // --------------------------------------------------------------------------------------------
nuclear@0: template <bool SwapEndianess, typename T, bool RuntimeSwitch>
nuclear@0: struct Getter {
nuclear@0: 	void operator() (T* inout, bool le) {
nuclear@0: #ifdef AI_BUILD_BIG_ENDIAN
nuclear@0: 		le =  le;
nuclear@0: #else
nuclear@0: 		le =  !le;
nuclear@0: #endif
nuclear@0: 		if (le) {
nuclear@0: 			ByteSwapper<T,(sizeof(T)>1?true:false)> () (inout);
nuclear@0: 		}
nuclear@0: 		else ByteSwapper<T,false> () (inout);
nuclear@0: 	}
nuclear@0: };
nuclear@0: 
nuclear@0: template <bool SwapEndianess, typename T> 
nuclear@0: struct Getter<SwapEndianess,T,false> {
nuclear@0: 
nuclear@0: 	void operator() (T* inout, bool /*le*/) {
nuclear@0: 		// static branch
nuclear@0: 		ByteSwapper<T,(SwapEndianess && sizeof(T)>1)> () (inout);
nuclear@0: 	}
nuclear@0: };
nuclear@0: } // end Intern
nuclear@0: } // end Assimp
nuclear@0: 
nuclear@0: #endif //!! AI_BYTESWAP_H_INC