284 lines
9.6 KiB
C++
284 lines
9.6 KiB
C++
/*************************************************************************/
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/* ByteSwapper.h */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md). */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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/*
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Open Asset Import Library (assimp)
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----------------------------------------------------------------------
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Copyright (c) 2006-2020, 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 BYTE_SWAPPER_H
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#define BYTE_SWAPPER_H
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#include <stdint.h>
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#include <algorithm>
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#include <locale>
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namespace FBXDocParser {
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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() {}
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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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uint8_t *const szOut = reinterpret_cast<uint8_t *>(_szOut);
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std::swap(szOut[0], szOut[1]);
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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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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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}
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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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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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}
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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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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>
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struct _swapper;
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};
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template <typename T>
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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>
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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>
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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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le = !le;
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if (le) {
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ByteSwapper<T, (sizeof(T) > 1 ? true : false)>()(inout);
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} else {
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ByteSwapper<T, false>()(inout);
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}
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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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} // namespace Intern
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} // namespace FBXDocParser
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#endif // BYTE_SWAPPER_H
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