293 lines
8.6 KiB
C++
293 lines
8.6 KiB
C++
/*
|
|
Open Asset Import Library (assimp)
|
|
----------------------------------------------------------------------
|
|
|
|
Copyright (c) 2006-2019, 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 oder 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 <stdint.h>
|
|
|
|
#if _MSC_VER >= 1400
|
|
#include <stdlib.h>
|
|
#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) 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) ByteSwap::Swap2(&(p))
|
|
# define AI_SWAP4(p) ByteSwap::Swap4(&(p))
|
|
# define AI_SWAP8(p) ByteSwap::Swap8(&(p))
|
|
# define AI_SWAP2P(p) ByteSwap::Swap2((p))
|
|
# define AI_SWAP4P(p) ByteSwap::Swap4((p))
|
|
# define AI_SWAP8P(p) ByteSwap::Swap8((p))
|
|
# define BE_NCONST
|
|
#else
|
|
# define AI_BE(t) (t)
|
|
# define AI_LE(t) 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) ByteSwap::Swap2(&(p))
|
|
# define AI_LSWAP4(p) ByteSwap::Swap4(&(p))
|
|
# define AI_LSWAP8(p) ByteSwap::Swap8(&(p))
|
|
# define AI_LSWAP2P(p) ByteSwap::Swap2((p))
|
|
# define AI_LSWAP4P(p) ByteSwap::Swap4((p))
|
|
# define AI_LSWAP8P(p) 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
|