1426cd3b3a
As many open source projects have started doing it, we're removing the current year from the copyright notice, so that we don't need to bump it every year. It seems like only the first year of publication is technically relevant for copyright notices, and even that seems to be something that many companies stopped listing altogether (in a version controlled codebase, the commits are a much better source of date of publication than a hardcoded copyright statement). We also now list Godot Engine contributors first as we're collectively the current maintainers of the project, and we clarify that the "exclusive" copyright of the co-founders covers the timespan before opensourcing (their further contributions are included as part of Godot Engine contributors). Also fixed "cf." Frenchism - it's meant as "refer to / see". Backported from #70885.
283 lines
9.6 KiB
C++
283 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) 2014-present Godot Engine contributors (see AUTHORS.md). */
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/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
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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 to perform various byte order swappings
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(e.g. little to big endian) */
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#ifndef BYTESWAPPER_H
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#define BYTESWAPPER_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 // BYTESWAPPER_H
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