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annotate libs/assimp/ByteSwap.h @ 3:c179c72369be

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author John Tsiombikas <nuclear@member.fsf.org>
date Mon, 03 Feb 2014 08:52:13 +0200
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nuclear@0 1 /*
nuclear@0 2 Open Asset Import Library (assimp)
nuclear@0 3 ----------------------------------------------------------------------
nuclear@0 4
nuclear@0 5 Copyright (c) 2006-2012, assimp team
nuclear@0 6 All rights reserved.
nuclear@0 7
nuclear@0 8 Redistribution and use of this software in source and binary forms,
nuclear@0 9 with or without modification, are permitted provided that the
nuclear@0 10 following conditions are met:
nuclear@0 11
nuclear@0 12 * Redistributions of source code must retain the above
nuclear@0 13 copyright notice, this list of conditions and the
nuclear@0 14 following disclaimer.
nuclear@0 15
nuclear@0 16 * Redistributions in binary form must reproduce the above
nuclear@0 17 copyright notice, this list of conditions and the
nuclear@0 18 following disclaimer in the documentation and/or other
nuclear@0 19 materials provided with the distribution.
nuclear@0 20
nuclear@0 21 * Neither the name of the assimp team, nor the names of its
nuclear@0 22 contributors may be used to endorse or promote products
nuclear@0 23 derived from this software without specific prior
nuclear@0 24 written permission of the assimp team.
nuclear@0 25
nuclear@0 26 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
nuclear@0 27 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
nuclear@0 28 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
nuclear@0 29 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
nuclear@0 30 OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
nuclear@0 31 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
nuclear@0 32 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
nuclear@0 33 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
nuclear@0 34 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
nuclear@0 35 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
nuclear@0 36 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
nuclear@0 37
nuclear@0 38 ----------------------------------------------------------------------
nuclear@0 39 */
nuclear@0 40
nuclear@0 41 /** @file Helper class tp perform various byte oder swappings
nuclear@0 42 (e.g. little to big endian) */
nuclear@0 43 #ifndef AI_BYTESWAP_H_INC
nuclear@0 44 #define AI_BYTESWAP_H_INC
nuclear@0 45
nuclear@0 46 #include "assimp/ai_assert.h"
nuclear@0 47 #include "assimp/types.h"
nuclear@0 48
nuclear@0 49 #if _MSC_VER >= 1400
nuclear@0 50 #include <stdlib.h>
nuclear@0 51 #endif
nuclear@0 52
nuclear@0 53 namespace Assimp {
nuclear@0 54 // --------------------------------------------------------------------------------------
nuclear@0 55 /** Defines some useful byte order swap routines.
nuclear@0 56 *
nuclear@0 57 * This is required to read big-endian model formats on little-endian machines,
nuclear@0 58 * and vice versa. Direct use of this class is DEPRECATED. Use #StreamReader instead. */
nuclear@0 59 // --------------------------------------------------------------------------------------
nuclear@0 60 class ByteSwap
nuclear@0 61 {
nuclear@0 62 ByteSwap() {}
nuclear@0 63
nuclear@0 64 public:
nuclear@0 65
nuclear@0 66 // ----------------------------------------------------------------------
nuclear@0 67 /** Swap two bytes of data
nuclear@0 68 * @param[inout] _szOut A void* to save the reintcasts for the caller. */
nuclear@0 69 static inline void Swap2(void* _szOut)
nuclear@0 70 {
nuclear@0 71 ai_assert(_szOut);
nuclear@0 72
nuclear@0 73 #if _MSC_VER >= 1400
nuclear@0 74 uint16_t* const szOut = reinterpret_cast<uint16_t*>(_szOut);
nuclear@0 75 *szOut = _byteswap_ushort(*szOut);
nuclear@0 76 #else
nuclear@0 77 uint8_t* const szOut = reinterpret_cast<uint8_t*>(_szOut);
nuclear@0 78 std::swap(szOut[0],szOut[1]);
nuclear@0 79 #endif
nuclear@0 80 }
nuclear@0 81
nuclear@0 82 // ----------------------------------------------------------------------
nuclear@0 83 /** Swap four bytes of data
nuclear@0 84 * @param[inout] _szOut A void* to save the reintcasts for the caller. */
nuclear@0 85 static inline void Swap4(void* _szOut)
nuclear@0 86 {
nuclear@0 87 ai_assert(_szOut);
nuclear@0 88
nuclear@0 89 #if _MSC_VER >= 1400
nuclear@0 90 uint32_t* const szOut = reinterpret_cast<uint32_t*>(_szOut);
nuclear@0 91 *szOut = _byteswap_ulong(*szOut);
nuclear@0 92 #else
nuclear@0 93 uint8_t* const szOut = reinterpret_cast<uint8_t*>(_szOut);
nuclear@0 94 std::swap(szOut[0],szOut[3]);
nuclear@0 95 std::swap(szOut[1],szOut[2]);
nuclear@0 96 #endif
nuclear@0 97 }
nuclear@0 98
nuclear@0 99 // ----------------------------------------------------------------------
nuclear@0 100 /** Swap eight bytes of data
nuclear@0 101 * @param[inout] _szOut A void* to save the reintcasts for the caller. */
nuclear@0 102 static inline void Swap8(void* _szOut)
nuclear@0 103 {
nuclear@0 104 ai_assert(_szOut);
nuclear@0 105
nuclear@0 106 #if _MSC_VER >= 1400
nuclear@0 107 uint64_t* const szOut = reinterpret_cast<uint64_t*>(_szOut);
nuclear@0 108 *szOut = _byteswap_uint64(*szOut);
nuclear@0 109 #else
nuclear@0 110 uint8_t* const szOut = reinterpret_cast<uint8_t*>(_szOut);
nuclear@0 111 std::swap(szOut[0],szOut[7]);
nuclear@0 112 std::swap(szOut[1],szOut[6]);
nuclear@0 113 std::swap(szOut[2],szOut[5]);
nuclear@0 114 std::swap(szOut[3],szOut[4]);
nuclear@0 115 #endif
nuclear@0 116 }
nuclear@0 117
nuclear@0 118 // ----------------------------------------------------------------------
nuclear@0 119 /** ByteSwap a float. Not a joke.
nuclear@0 120 * @param[inout] fOut ehm. .. */
nuclear@0 121 static inline void Swap(float* fOut) {
nuclear@0 122 Swap4(fOut);
nuclear@0 123 }
nuclear@0 124
nuclear@0 125 // ----------------------------------------------------------------------
nuclear@0 126 /** ByteSwap a double. Not a joke.
nuclear@0 127 * @param[inout] fOut ehm. .. */
nuclear@0 128 static inline void Swap(double* fOut) {
nuclear@0 129 Swap8(fOut);
nuclear@0 130 }
nuclear@0 131
nuclear@0 132
nuclear@0 133 // ----------------------------------------------------------------------
nuclear@0 134 /** ByteSwap an int16t. Not a joke.
nuclear@0 135 * @param[inout] fOut ehm. .. */
nuclear@0 136 static inline void Swap(int16_t* fOut) {
nuclear@0 137 Swap2(fOut);
nuclear@0 138 }
nuclear@0 139
nuclear@0 140 static inline void Swap(uint16_t* fOut) {
nuclear@0 141 Swap2(fOut);
nuclear@0 142 }
nuclear@0 143
nuclear@0 144 // ----------------------------------------------------------------------
nuclear@0 145 /** ByteSwap an int32t. Not a joke.
nuclear@0 146 * @param[inout] fOut ehm. .. */
nuclear@0 147 static inline void Swap(int32_t* fOut){
nuclear@0 148 Swap4(fOut);
nuclear@0 149 }
nuclear@0 150
nuclear@0 151 static inline void Swap(uint32_t* fOut){
nuclear@0 152 Swap4(fOut);
nuclear@0 153 }
nuclear@0 154
nuclear@0 155 // ----------------------------------------------------------------------
nuclear@0 156 /** ByteSwap an int64t. Not a joke.
nuclear@0 157 * @param[inout] fOut ehm. .. */
nuclear@0 158 static inline void Swap(int64_t* fOut) {
nuclear@0 159 Swap8(fOut);
nuclear@0 160 }
nuclear@0 161
nuclear@0 162 static inline void Swap(uint64_t* fOut) {
nuclear@0 163 Swap8(fOut);
nuclear@0 164 }
nuclear@0 165
nuclear@0 166 // ----------------------------------------------------------------------
nuclear@0 167 //! Templatized ByteSwap
nuclear@0 168 //! \returns param tOut as swapped
nuclear@0 169 template<typename Type>
nuclear@0 170 static inline Type Swapped(Type tOut)
nuclear@0 171 {
nuclear@0 172 return _swapper<Type,sizeof(Type)>()(tOut);
nuclear@0 173 }
nuclear@0 174
nuclear@0 175 private:
nuclear@0 176
nuclear@0 177 template <typename T, size_t size> struct _swapper;
nuclear@0 178 };
nuclear@0 179
nuclear@0 180 template <typename T> struct ByteSwap::_swapper<T,2> {
nuclear@0 181 T operator() (T tOut) {
nuclear@0 182 Swap2(&tOut);
nuclear@0 183 return tOut;
nuclear@0 184 }
nuclear@0 185 };
nuclear@0 186
nuclear@0 187 template <typename T> struct ByteSwap::_swapper<T,4> {
nuclear@0 188 T operator() (T tOut) {
nuclear@0 189 Swap4(&tOut);
nuclear@0 190 return tOut;
nuclear@0 191 }
nuclear@0 192 };
nuclear@0 193
nuclear@0 194 template <typename T> struct ByteSwap::_swapper<T,8> {
nuclear@0 195 T operator() (T tOut) {
nuclear@0 196 Swap8(&tOut);
nuclear@0 197 return tOut;
nuclear@0 198 }
nuclear@0 199 };
nuclear@0 200
nuclear@0 201
nuclear@0 202 // --------------------------------------------------------------------------------------
nuclear@0 203 // ByteSwap macros for BigEndian/LittleEndian support
nuclear@0 204 // --------------------------------------------------------------------------------------
nuclear@0 205 #if (defined AI_BUILD_BIG_ENDIAN)
nuclear@0 206 # define AI_LE(t) (t)
nuclear@0 207 # define AI_BE(t) ByteSwap::Swapped(t)
nuclear@0 208 # define AI_LSWAP2(p)
nuclear@0 209 # define AI_LSWAP4(p)
nuclear@0 210 # define AI_LSWAP8(p)
nuclear@0 211 # define AI_LSWAP2P(p)
nuclear@0 212 # define AI_LSWAP4P(p)
nuclear@0 213 # define AI_LSWAP8P(p)
nuclear@0 214 # define LE_NCONST const
nuclear@0 215 # define AI_SWAP2(p) ByteSwap::Swap2(&(p))
nuclear@0 216 # define AI_SWAP4(p) ByteSwap::Swap4(&(p))
nuclear@0 217 # define AI_SWAP8(p) ByteSwap::Swap8(&(p))
nuclear@0 218 # define AI_SWAP2P(p) ByteSwap::Swap2((p))
nuclear@0 219 # define AI_SWAP4P(p) ByteSwap::Swap4((p))
nuclear@0 220 # define AI_SWAP8P(p) ByteSwap::Swap8((p))
nuclear@0 221 # define BE_NCONST
nuclear@0 222 #else
nuclear@0 223 # define AI_BE(t) (t)
nuclear@0 224 # define AI_LE(t) ByteSwap::Swapped(t)
nuclear@0 225 # define AI_SWAP2(p)
nuclear@0 226 # define AI_SWAP4(p)
nuclear@0 227 # define AI_SWAP8(p)
nuclear@0 228 # define AI_SWAP2P(p)
nuclear@0 229 # define AI_SWAP4P(p)
nuclear@0 230 # define AI_SWAP8P(p)
nuclear@0 231 # define BE_NCONST const
nuclear@0 232 # define AI_LSWAP2(p) ByteSwap::Swap2(&(p))
nuclear@0 233 # define AI_LSWAP4(p) ByteSwap::Swap4(&(p))
nuclear@0 234 # define AI_LSWAP8(p) ByteSwap::Swap8(&(p))
nuclear@0 235 # define AI_LSWAP2P(p) ByteSwap::Swap2((p))
nuclear@0 236 # define AI_LSWAP4P(p) ByteSwap::Swap4((p))
nuclear@0 237 # define AI_LSWAP8P(p) ByteSwap::Swap8((p))
nuclear@0 238 # define LE_NCONST
nuclear@0 239 #endif
nuclear@0 240
nuclear@0 241
nuclear@0 242 namespace Intern {
nuclear@0 243
nuclear@0 244 // --------------------------------------------------------------------------------------------
nuclear@0 245 template <typename T, bool doit>
nuclear@0 246 struct ByteSwapper {
nuclear@0 247 void operator() (T* inout) {
nuclear@0 248 ByteSwap::Swap(inout);
nuclear@0 249 }
nuclear@0 250 };
nuclear@0 251
nuclear@0 252 template <typename T>
nuclear@0 253 struct ByteSwapper<T,false> {
nuclear@0 254 void operator() (T*) {
nuclear@0 255 }
nuclear@0 256 };
nuclear@0 257
nuclear@0 258 // --------------------------------------------------------------------------------------------
nuclear@0 259 template <bool SwapEndianess, typename T, bool RuntimeSwitch>
nuclear@0 260 struct Getter {
nuclear@0 261 void operator() (T* inout, bool le) {
nuclear@0 262 #ifdef AI_BUILD_BIG_ENDIAN
nuclear@0 263 le = le;
nuclear@0 264 #else
nuclear@0 265 le = !le;
nuclear@0 266 #endif
nuclear@0 267 if (le) {
nuclear@0 268 ByteSwapper<T,(sizeof(T)>1?true:false)> () (inout);
nuclear@0 269 }
nuclear@0 270 else ByteSwapper<T,false> () (inout);
nuclear@0 271 }
nuclear@0 272 };
nuclear@0 273
nuclear@0 274 template <bool SwapEndianess, typename T>
nuclear@0 275 struct Getter<SwapEndianess,T,false> {
nuclear@0 276
nuclear@0 277 void operator() (T* inout, bool /*le*/) {
nuclear@0 278 // static branch
nuclear@0 279 ByteSwapper<T,(SwapEndianess && sizeof(T)>1)> () (inout);
nuclear@0 280 }
nuclear@0 281 };
nuclear@0 282 } // end Intern
nuclear@0 283 } // end Assimp
nuclear@0 284
nuclear@0 285 #endif //!! AI_BYTESWAP_H_INC