src/gromacs/utility/inmemoryserializer.cpp

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  35 /*! \internal \file
  36  * \brief
  37  * Defines gmx::ISerializer implementation for in-memory serialization.
  38  *
  39  * \author Teemu Murtola <teemu.murtola@gmail.com>
  40  * \ingroup module_utility
  41  */
  42 #include "gmxpre.h"
  43
  44 #include "inmemoryserializer.h"
  45
  46 #include "config.h"
  47
  48 #include <algorithm>
  49 #include <vector>
  50
  51 namespace gmx
  52 {
  53
  54 namespace
  55 {
  56
  57 template<typename T>
  58 class CharBuffer
  59 {
  60 public:
  61     static constexpr size_t ValueSize = sizeof(T);
  62
  63     explicit CharBuffer(T value) { u.v = value; }
  64     explicit CharBuffer(const char buffer[]) { std::copy(buffer, buffer + ValueSize, u.c); }
  65
  66     T value() const { return u.v; }
  67
  68     void appendTo(std::vector<char>* buffer)
  69     {
  70         buffer->insert(buffer->end(), u.c, u.c + ValueSize);
  71     }
  72
  73 private:
  74     union {
  75         char c[ValueSize];
  76         T    v;
  77     } u;
  78 };
  79
  80 //! Return \c value with the byte order swapped.
  81 template<typename T>
  82 T swapEndian(const T& value)
  83 {
  84     union {
  85         T                           value_;
  86         std::array<char, sizeof(T)> valueAsCharArray_;
  87     } endianessSwappedValue;
  88
  89     endianessSwappedValue.value_ = value;
  90     int hiByte                   = sizeof(T) - 1;
  91     for (int loByte = 0; hiByte > loByte; loByte++, hiByte--)
  92     {
  93         std::swap(endianessSwappedValue.valueAsCharArray_[loByte],
  94                   endianessSwappedValue.valueAsCharArray_[hiByte]);
  95     }
  96
  97     return endianessSwappedValue.value_;
  98 }
  99
 100 /*! \brief Change the host-dependent endian settings to either Swap or DoNotSwap.
 101  *
 102  * \param endianSwapBehavior input swap behavior, might depend on host.
 103  *
 104  * \return Host-independent setting, either Swap or DoNotSwap. */
 105 EndianSwapBehavior setEndianSwapBehaviorFromHost(EndianSwapBehavior endianSwapBehavior)
 106 {
 107     if (endianSwapBehavior == EndianSwapBehavior::SwapIfHostIsBigEndian)
 108     {
 109         return GMX_INTEGER_BIG_ENDIAN ? EndianSwapBehavior::Swap : EndianSwapBehavior::DoNotSwap;
 110     }
 111     else if (endianSwapBehavior == EndianSwapBehavior::SwapIfHostIsLittleEndian)
 112     {
 113         return GMX_INTEGER_BIG_ENDIAN ? EndianSwapBehavior::DoNotSwap : EndianSwapBehavior::Swap;
 114     }
 115     else
 116     {
 117         return endianSwapBehavior;
 118     }
 119 }
 120
 121 } // namespace
 122
 123 /********************************************************************
 124  * InMemorySerializer
 125  */
 126
 127 class InMemorySerializer::Impl
 128 {
 129 public:
 130     Impl(EndianSwapBehavior endianSwapBehavior) :
 131         endianSwapBehavior_(setEndianSwapBehaviorFromHost(endianSwapBehavior))
 132     {
 133     }
 134
 135     template<typename T>
 136     void doValue(T value)
 137     {
 138         if (endianSwapBehavior_ == EndianSwapBehavior::Swap)
 139         {
 140             CharBuffer<T>(swapEndian(value)).appendTo(&buffer_);
 141         }
 142         else
 143         {
 144             CharBuffer<T>(value).appendTo(&buffer_);
 145         }
 146     }
 147     void doString(const std::string& value)
 148     {
 149         doValue<uint64_t>(value.size());
 150         buffer_.insert(buffer_.end(), value.begin(), value.end());
 151     }
 152     void doOpaque(const char* data, std::size_t size)
 153     {
 154         buffer_.insert(buffer_.end(), data, data + size);
 155     }
 156
 157     std::vector<char>  buffer_;
 158     EndianSwapBehavior endianSwapBehavior_;
 159 };
 160
 161 InMemorySerializer::InMemorySerializer(EndianSwapBehavior endianSwapBehavior) :
 162     impl_(new Impl(endianSwapBehavior))
 163 {
 164 }
 165
 166 InMemorySerializer::~InMemorySerializer() = default;
 167
 168 std::vector<char> InMemorySerializer::finishAndGetBuffer()
 169 {
 170     return std::move(impl_->buffer_);
 171 }
 172
 173 void InMemorySerializer::doBool(bool* value)
 174 {
 175     impl_->doValue(*value);
 176 }
 177
 178 void InMemorySerializer::doUChar(unsigned char* value)
 179 {
 180     impl_->doValue(*value);
 181 }
 182
 183 void InMemorySerializer::doChar(char* value)
 184 {
 185     impl_->doValue(*value);
 186 }
 187
 188 void InMemorySerializer::doUShort(unsigned short* value)
 189 {
 190     impl_->doValue(*value);
 191 }
 192
 193 void InMemorySerializer::doInt(int* value)
 194 {
 195     impl_->doValue(*value);
 196 }
 197
 198 void InMemorySerializer::doInt32(int32_t* value)
 199 {
 200     impl_->doValue(*value);
 201 }
 202
 203 void InMemorySerializer::doInt64(int64_t* value)
 204 {
 205     impl_->doValue(*value);
 206 }
 207
 208 void InMemorySerializer::doFloat(float* value)
 209 {
 210     impl_->doValue(*value);
 211 }
 212
 213 void InMemorySerializer::doDouble(double* value)
 214 {
 215     impl_->doValue(*value);
 216 }
 217
 218 void InMemorySerializer::doReal(real* value)
 219 {
 220     impl_->doValue(*value);
 221 }
 222
 223 void InMemorySerializer::doRvec(rvec* value)
 224 {
 225     for (int d = 0; d < DIM; d++)
 226     {
 227         doReal(&(*value)[d]);
 228     }
 229 }
 230
 231 void InMemorySerializer::doIvec(ivec* value)
 232 {
 233     for (int d = 0; d < DIM; d++)
 234     {
 235         doInt(&(*value)[d]);
 236     }
 237 }
 238
 239 void InMemorySerializer::doString(std::string* value)
 240 {
 241     impl_->doString(*value);
 242 }
 243
 244 void InMemorySerializer::doOpaque(char* data, std::size_t size)
 245 {
 246     impl_->doOpaque(data, size);
 247 }
 248
 249 /********************************************************************
 250  * InMemoryDeserializer
 251  */
 252
 253 class InMemoryDeserializer::Impl
 254 {
 255 public:
 256     explicit Impl(ArrayRef<const char> buffer, bool sourceIsDouble, EndianSwapBehavior endianSwapBehavior) :
 257         buffer_(buffer),
 258         sourceIsDouble_(sourceIsDouble),
 259         pos_(0),
 260         endianSwapBehavior_(setEndianSwapBehaviorFromHost(endianSwapBehavior))
 261     {
 262     }
 263
 264     template<typename T>
 265     void doValue(T* value)
 266     {
 267         if (endianSwapBehavior_ == EndianSwapBehavior::Swap)
 268         {
 269             *value = swapEndian(CharBuffer<T>(&buffer_[pos_]).value());
 270         }
 271         else
 272         {
 273             *value = CharBuffer<T>(&buffer_[pos_]).value();
 274         }
 275         pos_ += CharBuffer<T>::ValueSize;
 276     }
 277     void doString(std::string* value)
 278     {
 279         uint64_t size;
 280         doValue<uint64_t>(&size);
 281         *value = std::string(&buffer_[pos_], size);
 282         pos_ += size;
 283     }
 284     void doOpaque(char* data, std::size_t size)
 285     {
 286         std::copy(&buffer_[pos_], &buffer_[pos_ + size], data);
 287         pos_ += size;
 288     }
 289
 290     ArrayRef<const char> buffer_;
 291     bool                 sourceIsDouble_;
 292     size_t               pos_;
 293     EndianSwapBehavior   endianSwapBehavior_;
 294 };
 295
 296 InMemoryDeserializer::InMemoryDeserializer(ArrayRef<const char> buffer,
 297                                            bool                 sourceIsDouble,
 298                                            EndianSwapBehavior   endianSwapBehavior) :
 299     impl_(new Impl(buffer, sourceIsDouble, endianSwapBehavior))
 300 {
 301 }
 302
 303 InMemoryDeserializer::~InMemoryDeserializer() = default;
 304
 305 bool InMemoryDeserializer::sourceIsDouble() const
 306 {
 307     return impl_->sourceIsDouble_;
 308 }
 309
 310 void InMemoryDeserializer::doBool(bool* value)
 311 {
 312     impl_->doValue(value);
 313 }
 314
 315 void InMemoryDeserializer::doUChar(unsigned char* value)
 316 {
 317     impl_->doValue(value);
 318 }
 319
 320 void InMemoryDeserializer::doChar(char* value)
 321 {
 322     impl_->doValue(value);
 323 }
 324
 325 void InMemoryDeserializer::doUShort(unsigned short* value)
 326 {
 327     impl_->doValue(value);
 328 }
 329
 330 void InMemoryDeserializer::doInt(int* value)
 331 {
 332     impl_->doValue(value);
 333 }
 334
 335 void InMemoryDeserializer::doInt32(int32_t* value)
 336 {
 337     impl_->doValue(value);
 338 }
 339
 340 void InMemoryDeserializer::doInt64(int64_t* value)
 341 {
 342     impl_->doValue(value);
 343 }
 344
 345 void InMemoryDeserializer::doFloat(float* value)
 346 {
 347     impl_->doValue(value);
 348 }
 349
 350 void InMemoryDeserializer::doDouble(double* value)
 351 {
 352     impl_->doValue(value);
 353 }
 354
 355 void InMemoryDeserializer::doReal(real* value)
 356 {
 357     if (sourceIsDouble())
 358     {
 359         double temp = 0.0;
 360         doDouble(&temp);
 361         *value = temp;
 362     }
 363     else
 364     {
 365         float temp = 0.0;
 366         doFloat(&temp);
 367         *value = temp;
 368     }
 369 }
 370
 371 void InMemoryDeserializer::doRvec(rvec* value)
 372 {
 373     for (int d = 0; d < DIM; d++)
 374     {
 375         doReal(&(*value)[d]);
 376     }
 377 }
 378
 379 void InMemoryDeserializer::doIvec(ivec* value)
 380 {
 381     for (int d = 0; d < DIM; d++)
 382     {
 383         doInt(&(*value)[d]);
 384     }
 385 }
 386
 387 void InMemoryDeserializer::doString(std::string* value)
 388 {
 389     impl_->doString(value);
 390 }
 391
 392 void InMemoryDeserializer::doOpaque(char* data, std::size_t size)
 393 {
 394     impl_->doOpaque(data, size);
 395 }
 396
 397 } // namespace gmx