288 lines
8.5 KiB
C++
288 lines
8.5 KiB
C++
/*
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Open Asset Import Library (assimp)
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----------------------------------------------------------------------
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Copyright (c) 2006-2019, assimp team
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All rights reserved.
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Redistribution and use of this software in source and binary forms,
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with or without modification, are permitted provided that the
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following conditions are met:
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* Redistributions of source code must retain the above
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copyright notice, this list of conditions and the
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following disclaimer.
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* Redistributions in binary form must reproduce the above
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copyright notice, this list of conditions and the
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following disclaimer in the documentation and/or other
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materials provided with the distribution.
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* Neither the name of the assimp team, nor the names of its
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contributors may be used to endorse or promote products
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derived from this software without specific prior
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written permission of the assimp team.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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----------------------------------------------------------------------
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*/
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/** @file Helper class tp perform various byte oder swappings
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(e.g. little to big endian) */
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#ifndef AI_BYTESWAPPER_H_INC
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#define AI_BYTESWAPPER_H_INC
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#include <assimp/ai_assert.h>
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#include <assimp/types.h>
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#include <stdint.h>
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#if _MSC_VER >= 1400
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#include <stdlib.h>
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#endif
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namespace Assimp {
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// --------------------------------------------------------------------------------------
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/** Defines some useful byte order swap routines.
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*
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* This is required to read big-endian model formats on little-endian machines,
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* and vice versa. Direct use of this class is DEPRECATED. Use #StreamReader instead. */
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// --------------------------------------------------------------------------------------
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class ByteSwap {
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ByteSwap() AI_NO_EXCEPT {}
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public:
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// ----------------------------------------------------------------------
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/** Swap two bytes of data
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* @param[inout] _szOut A void* to save the reintcasts for the caller. */
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static inline void Swap2(void* _szOut)
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{
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ai_assert(_szOut);
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#if _MSC_VER >= 1400
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uint16_t* const szOut = reinterpret_cast<uint16_t*>(_szOut);
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*szOut = _byteswap_ushort(*szOut);
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#else
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uint8_t* const szOut = reinterpret_cast<uint8_t*>(_szOut);
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std::swap(szOut[0],szOut[1]);
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#endif
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}
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// ----------------------------------------------------------------------
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/** Swap four bytes of data
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* @param[inout] _szOut A void* to save the reintcasts for the caller. */
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static inline void Swap4(void* _szOut)
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{
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ai_assert(_szOut);
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#if _MSC_VER >= 1400
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uint32_t* const szOut = reinterpret_cast<uint32_t*>(_szOut);
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*szOut = _byteswap_ulong(*szOut);
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#else
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uint8_t* const szOut = reinterpret_cast<uint8_t*>(_szOut);
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std::swap(szOut[0],szOut[3]);
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std::swap(szOut[1],szOut[2]);
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#endif
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}
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// ----------------------------------------------------------------------
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/** Swap eight bytes of data
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* @param[inout] _szOut A void* to save the reintcasts for the caller. */
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static inline void Swap8(void* _szOut)
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{
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ai_assert(_szOut);
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#if _MSC_VER >= 1400
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uint64_t* const szOut = reinterpret_cast<uint64_t*>(_szOut);
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*szOut = _byteswap_uint64(*szOut);
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#else
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uint8_t* const szOut = reinterpret_cast<uint8_t*>(_szOut);
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std::swap(szOut[0],szOut[7]);
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std::swap(szOut[1],szOut[6]);
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std::swap(szOut[2],szOut[5]);
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std::swap(szOut[3],szOut[4]);
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#endif
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}
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// ----------------------------------------------------------------------
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/** ByteSwap a float. Not a joke.
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* @param[inout] fOut ehm. .. */
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static inline void Swap(float* fOut) {
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Swap4(fOut);
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}
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// ----------------------------------------------------------------------
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/** ByteSwap a double. Not a joke.
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* @param[inout] fOut ehm. .. */
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static inline void Swap(double* fOut) {
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Swap8(fOut);
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}
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// ----------------------------------------------------------------------
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/** ByteSwap an int16t. Not a joke.
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* @param[inout] fOut ehm. .. */
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static inline void Swap(int16_t* fOut) {
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Swap2(fOut);
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}
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static inline void Swap(uint16_t* fOut) {
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Swap2(fOut);
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}
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// ----------------------------------------------------------------------
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/** ByteSwap an int32t. Not a joke.
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* @param[inout] fOut ehm. .. */
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static inline void Swap(int32_t* fOut){
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Swap4(fOut);
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}
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static inline void Swap(uint32_t* fOut){
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Swap4(fOut);
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}
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// ----------------------------------------------------------------------
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/** ByteSwap an int64t. Not a joke.
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* @param[inout] fOut ehm. .. */
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static inline void Swap(int64_t* fOut) {
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Swap8(fOut);
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}
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static inline void Swap(uint64_t* fOut) {
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Swap8(fOut);
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}
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// ----------------------------------------------------------------------
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//! Templatized ByteSwap
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//! \returns param tOut as swapped
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template<typename Type>
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static inline Type Swapped(Type tOut)
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{
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return _swapper<Type,sizeof(Type)>()(tOut);
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}
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private:
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template <typename T, size_t size> struct _swapper;
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};
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template <typename T> struct ByteSwap::_swapper<T,2> {
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T operator() (T tOut) {
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Swap2(&tOut);
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return tOut;
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}
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};
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template <typename T> struct ByteSwap::_swapper<T,4> {
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T operator() (T tOut) {
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Swap4(&tOut);
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return tOut;
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}
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};
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template <typename T> struct ByteSwap::_swapper<T,8> {
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T operator() (T tOut) {
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Swap8(&tOut);
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return tOut;
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}
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};
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// --------------------------------------------------------------------------------------
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// ByteSwap macros for BigEndian/LittleEndian support
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// --------------------------------------------------------------------------------------
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#if (defined AI_BUILD_BIG_ENDIAN)
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# define AI_LE(t) (t)
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# define AI_BE(t) ByteSwap::Swapped(t)
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# define AI_LSWAP2(p)
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# define AI_LSWAP4(p)
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# define AI_LSWAP8(p)
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# define AI_LSWAP2P(p)
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# define AI_LSWAP4P(p)
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# define AI_LSWAP8P(p)
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# define LE_NCONST const
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# define AI_SWAP2(p) ByteSwap::Swap2(&(p))
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# define AI_SWAP4(p) ByteSwap::Swap4(&(p))
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# define AI_SWAP8(p) ByteSwap::Swap8(&(p))
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# define AI_SWAP2P(p) ByteSwap::Swap2((p))
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# define AI_SWAP4P(p) ByteSwap::Swap4((p))
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# define AI_SWAP8P(p) ByteSwap::Swap8((p))
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# define BE_NCONST
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#else
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# define AI_BE(t) (t)
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# define AI_LE(t) ByteSwap::Swapped(t)
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# define AI_SWAP2(p)
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# define AI_SWAP4(p)
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# define AI_SWAP8(p)
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# define AI_SWAP2P(p)
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# define AI_SWAP4P(p)
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# define AI_SWAP8P(p)
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# define BE_NCONST const
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# define AI_LSWAP2(p) ByteSwap::Swap2(&(p))
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# define AI_LSWAP4(p) ByteSwap::Swap4(&(p))
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# define AI_LSWAP8(p) ByteSwap::Swap8(&(p))
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# define AI_LSWAP2P(p) ByteSwap::Swap2((p))
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# define AI_LSWAP4P(p) ByteSwap::Swap4((p))
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# define AI_LSWAP8P(p) ByteSwap::Swap8((p))
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# define LE_NCONST
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#endif
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namespace Intern {
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// --------------------------------------------------------------------------------------------
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template <typename T, bool doit>
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struct ByteSwapper {
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void operator() (T* inout) {
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ByteSwap::Swap(inout);
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}
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};
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template <typename T>
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struct ByteSwapper<T,false> {
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void operator() (T*) {
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}
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};
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// --------------------------------------------------------------------------------------------
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template <bool SwapEndianess, typename T, bool RuntimeSwitch>
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struct Getter {
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void operator() (T* inout, bool le) {
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#ifdef AI_BUILD_BIG_ENDIAN
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le = le;
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#else
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le = !le;
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#endif
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if (le) {
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ByteSwapper<T,(sizeof(T)>1?true:false)> () (inout);
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}
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else ByteSwapper<T,false> () (inout);
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}
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};
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template <bool SwapEndianess, typename T>
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struct Getter<SwapEndianess,T,false> {
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void operator() (T* inout, bool /*le*/) {
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// static branch
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ByteSwapper<T,(SwapEndianess && sizeof(T)>1)> () (inout);
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}
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};
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} // end Intern
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} // end Assimp
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#endif //!! AI_BYTESWAPPER_H_INC
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