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+/*
+Open Asset Import Library (assimp)
+----------------------------------------------------------------------
+
+Copyright (c) 2006-2022, assimp team
+
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the
+following conditions are met:
+
+* Redistributions of source code must retain the above
+ copyright notice, this list of conditions and the
+ following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+ copyright notice, this list of conditions and the
+ following disclaimer in the documentation and/or other
+ materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+ contributors may be used to endorse or promote products
+ derived from this software without specific prior
+ written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+----------------------------------------------------------------------
+*/
+
+/** @file Helper class tp perform various byte order swappings
+ (e.g. little to big endian) */
+#pragma once
+#ifndef AI_BYTESWAPPER_H_INC
+#define AI_BYTESWAPPER_H_INC
+
+#ifdef __GNUC__
+# pragma GCC system_header
+#endif
+
+#include <assimp/ai_assert.h>
+#include <assimp/types.h>
+#include <cstdint>
+
+#if _MSC_VER >= 1400
+#include <cstdlib>
+#endif
+
+namespace Assimp {
+// --------------------------------------------------------------------------------------
+/** Defines some useful byte order swap routines.
+ *
+ * This is required to read big-endian model formats on little-endian machines,
+ * and vice versa. Direct use of this class is DEPRECATED. Use #StreamReader instead. */
+// --------------------------------------------------------------------------------------
+class ByteSwap {
+ ByteSwap() AI_NO_EXCEPT {}
+
+public:
+
+ // ----------------------------------------------------------------------
+ /** Swap two bytes of data
+ * @param[inout] _szOut A void* to save the reintcasts for the caller. */
+ static inline void Swap2(void* _szOut)
+ {
+ ai_assert(_szOut);
+
+#if _MSC_VER >= 1400
+ uint16_t* const szOut = reinterpret_cast<uint16_t*>(_szOut);
+ *szOut = _byteswap_ushort(*szOut);
+#else
+ uint8_t* const szOut = reinterpret_cast<uint8_t*>(_szOut);
+ std::swap(szOut[0],szOut[1]);
+#endif
+ }
+
+ // ----------------------------------------------------------------------
+ /** Swap four bytes of data
+ * @param[inout] _szOut A void* to save the reintcasts for the caller. */
+ static inline void Swap4(void* _szOut)
+ {
+ ai_assert(_szOut);
+
+#if _MSC_VER >= 1400
+ uint32_t* const szOut = reinterpret_cast<uint32_t*>(_szOut);
+ *szOut = _byteswap_ulong(*szOut);
+#else
+ uint8_t* const szOut = reinterpret_cast<uint8_t*>(_szOut);
+ std::swap(szOut[0],szOut[3]);
+ std::swap(szOut[1],szOut[2]);
+#endif
+ }
+
+ // ----------------------------------------------------------------------
+ /** Swap eight bytes of data
+ * @param[inout] _szOut A void* to save the reintcasts for the caller. */
+ static inline void Swap8(void* _szOut)
+ {
+ ai_assert(_szOut);
+
+#if _MSC_VER >= 1400
+ uint64_t* const szOut = reinterpret_cast<uint64_t*>(_szOut);
+ *szOut = _byteswap_uint64(*szOut);
+#else
+ uint8_t* const szOut = reinterpret_cast<uint8_t*>(_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]);
+#endif
+ }
+
+ // ----------------------------------------------------------------------
+ /** ByteSwap a float. Not a joke.
+ * @param[inout] fOut ehm. .. */
+ static inline void Swap(float* fOut) {
+ Swap4(fOut);
+ }
+
+ // ----------------------------------------------------------------------
+ /** ByteSwap a double. Not a joke.
+ * @param[inout] fOut ehm. .. */
+ static inline void Swap(double* fOut) {
+ Swap8(fOut);
+ }
+
+
+ // ----------------------------------------------------------------------
+ /** ByteSwap an int16t. Not a joke.
+ * @param[inout] fOut ehm. .. */
+ static inline void Swap(int16_t* fOut) {
+ Swap2(fOut);
+ }
+
+ static inline void Swap(uint16_t* fOut) {
+ Swap2(fOut);
+ }
+
+ // ----------------------------------------------------------------------
+ /** ByteSwap an int32t. Not a joke.
+ * @param[inout] fOut ehm. .. */
+ static inline void Swap(int32_t* fOut){
+ Swap4(fOut);
+ }
+
+ static inline void Swap(uint32_t* fOut){
+ Swap4(fOut);
+ }
+
+ // ----------------------------------------------------------------------
+ /** ByteSwap an int64t. Not a joke.
+ * @param[inout] fOut ehm. .. */
+ static inline void Swap(int64_t* fOut) {
+ Swap8(fOut);
+ }
+
+ static inline void Swap(uint64_t* fOut) {
+ Swap8(fOut);
+ }
+
+ // ----------------------------------------------------------------------
+ //! Templatized ByteSwap
+ //! \returns param tOut as swapped
+ template<typename Type>
+ static inline Type Swapped(Type tOut)
+ {
+ return _swapper<Type,sizeof(Type)>()(tOut);
+ }
+
+private:
+
+ template <typename T, size_t size> struct _swapper;
+};
+
+template <typename T> struct ByteSwap::_swapper<T,2> {
+ T operator() (T tOut) {
+ Swap2(&tOut);
+ return tOut;
+ }
+};
+
+template <typename T> struct ByteSwap::_swapper<T,4> {
+ T operator() (T tOut) {
+ Swap4(&tOut);
+ return tOut;
+ }
+};
+
+template <typename T> struct ByteSwap::_swapper<T,8> {
+ T operator() (T tOut) {
+ Swap8(&tOut);
+ return tOut;
+ }
+};
+
+
+// --------------------------------------------------------------------------------------
+// ByteSwap macros for BigEndian/LittleEndian support
+// --------------------------------------------------------------------------------------
+#if (defined AI_BUILD_BIG_ENDIAN)
+# define AI_LE(t) (t)
+# define AI_BE(t) Assimp::ByteSwap::Swapped(t)
+# define AI_LSWAP2(p)
+# define AI_LSWAP4(p)
+# define AI_LSWAP8(p)
+# define AI_LSWAP2P(p)
+# define AI_LSWAP4P(p)
+# define AI_LSWAP8P(p)
+# define LE_NCONST const
+# define AI_SWAP2(p) Assimp::ByteSwap::Swap2(&(p))
+# define AI_SWAP4(p) Assimp::ByteSwap::Swap4(&(p))
+# define AI_SWAP8(p) Assimp::ByteSwap::Swap8(&(p))
+# define AI_SWAP2P(p) Assimp::ByteSwap::Swap2((p))
+# define AI_SWAP4P(p) Assimp::ByteSwap::Swap4((p))
+# define AI_SWAP8P(p) Assimp::ByteSwap::Swap8((p))
+# define BE_NCONST
+#else
+# define AI_BE(t) (t)
+# define AI_LE(t) Assimp::ByteSwap::Swapped(t)
+# define AI_SWAP2(p)
+# define AI_SWAP4(p)
+# define AI_SWAP8(p)
+# define AI_SWAP2P(p)
+# define AI_SWAP4P(p)
+# define AI_SWAP8P(p)
+# define BE_NCONST const
+# define AI_LSWAP2(p) Assimp::ByteSwap::Swap2(&(p))
+# define AI_LSWAP4(p) Assimp::ByteSwap::Swap4(&(p))
+# define AI_LSWAP8(p) Assimp::ByteSwap::Swap8(&(p))
+# define AI_LSWAP2P(p) Assimp::ByteSwap::Swap2((p))
+# define AI_LSWAP4P(p) Assimp::ByteSwap::Swap4((p))
+# define AI_LSWAP8P(p) Assimp::ByteSwap::Swap8((p))
+# define LE_NCONST
+#endif
+
+
+namespace Intern {
+
+// --------------------------------------------------------------------------------------------
+template <typename T, bool doit>
+struct ByteSwapper {
+ void operator() (T* inout) {
+ ByteSwap::Swap(inout);
+ }
+};
+
+template <typename T>
+struct ByteSwapper<T,false> {
+ void operator() (T*) {
+ }
+};
+
+// --------------------------------------------------------------------------------------------
+template <bool SwapEndianess, typename T, bool RuntimeSwitch>
+struct Getter {
+ void operator() (T* inout, bool le) {
+#ifdef AI_BUILD_BIG_ENDIAN
+ le = le;
+#else
+ le = !le;
+#endif
+ if (le) {
+ ByteSwapper<T,(sizeof(T)>1?true:false)> () (inout);
+ }
+ else ByteSwapper<T,false> () (inout);
+ }
+};
+
+template <bool SwapEndianess, typename T>
+struct Getter<SwapEndianess,T,false> {
+
+ void operator() (T* inout, bool /*le*/) {
+ // static branch
+ ByteSwapper<T,(SwapEndianess && sizeof(T)>1)> () (inout);
+ }
+};
+} // end Intern
+} // end Assimp
+
+#endif //!! AI_BYTESWAPPER_H_INC
generated by cgit v1.2.1 (git 2.18.0) at 2024-12-25 03:01:37 +0000