1  /*
  2   * Copyright (C) 2013-2019 Apple Inc. All rights reserved.
  3   *
  4   * Redistribution and use in source and binary forms, with or without
  5   * modification, are permitted provided that the following conditions
  6   * are met:
  7   * 1. Redistributions of source code must retain the above copyright
  8   *    notice, this list of conditions and the following disclaimer.
  9   * 2. Redistributions in binary form must reproduce the above copyright
 10   *    notice, this list of conditions and the following disclaimer in the
 11   *    documentation and/or other materials provided with the distribution.
 12   *
 13   * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
 14   * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 15   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 16   * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
 17   * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 18   * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 19   * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 20   * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 21   * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 22   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 23   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 24   */
 25  
 26  #pragma once
 27  
 28  #include "JSCJSValue.h"
 29  #include "MathCommon.h"
 30  #include "TypedArrayType.h"
 31  #include <wtf/MathExtras.h>
 32  
 33  namespace JSC {
 34  
 35  template<
 36      typename TypeArg, typename ViewTypeArg, typename JSViewTypeArg,
 37      TypedArrayType typeValueArg>
 38  struct IntegralTypedArrayAdaptor {
 39      typedef TypeArg Type;
 40      typedef ViewTypeArg ViewType;
 41      typedef JSViewTypeArg JSViewType;
 42      static const TypedArrayType typeValue = typeValueArg;
 43      constexpr static const TypeArg minValue = std::numeric_limits<TypeArg>::lowest();
 44      constexpr static const TypeArg maxValue = std::numeric_limits<TypeArg>::max();
 45  
 46      static JSValue toJSValue(Type value)
 47      {
 48          static_assert(!std::is_floating_point<Type>::value, "");
 49          return jsNumber(value);
 50      }
 51      
 52      static double toDouble(Type value)
 53      {
 54          return static_cast<double>(value);
 55      }
 56      
 57      static Type toNativeFromInt32(int32_t value)
 58      {
 59          return static_cast<Type>(value);
 60      }
 61      
 62      static Type toNativeFromUint32(uint32_t value)
 63      {
 64          return static_cast<Type>(value);
 65      }
 66      
 67      static Type toNativeFromDouble(double value)
 68      {
 69          int32_t result = static_cast<int32_t>(value);
 70          if (static_cast<double>(result) != value)
 71              result = toInt32(value);
 72          return static_cast<Type>(result);
 73      }
 74      
 75      template<typename OtherAdaptor>
 76      static typename OtherAdaptor::Type convertTo(Type value)
 77      {
 78          if (typeValue == TypeUint32)
 79              return OtherAdaptor::toNativeFromUint32(value);
 80          return OtherAdaptor::toNativeFromInt32(value);
 81      }
 82  
 83      static Optional<Type> toNativeFromInt32WithoutCoercion(int32_t value)
 84      {
 85          if ((value >= 0 && static_cast<uint32_t>(value) > static_cast<uint32_t>(maxValue)) || value < static_cast<int32_t>(minValue))
 86              return WTF::nullopt;
 87          return static_cast<Type>(value);
 88      }
 89  
 90      static Optional<Type> toNativeFromUint32WithoutCoercion(uint32_t value)
 91      {
 92          if (value > static_cast<uint32_t>(maxValue))
 93              return WTF::nullopt;
 94  
 95          return static_cast<Type>(value);
 96      }
 97  
 98      static Optional<Type> toNativeFromDoubleWithoutCoercion(double value)
 99      {
100          Type integer = static_cast<Type>(value);
101          if (static_cast<double>(integer) != value)
102              return WTF::nullopt;
103  
104          if (value < 0)
105              return toNativeFromInt32WithoutCoercion(static_cast<int32_t>(value));
106          
107          return toNativeFromUint32WithoutCoercion(static_cast<uint32_t>(value));
108      }
109  };
110  
111  template<
112      typename TypeArg, typename ViewTypeArg, typename JSViewTypeArg,
113      TypedArrayType typeValueArg>
114  struct FloatTypedArrayAdaptor {
115      typedef TypeArg Type;
116      typedef ViewTypeArg ViewType;
117      typedef JSViewTypeArg JSViewType;
118      static const TypedArrayType typeValue = typeValueArg;
119      constexpr static const TypeArg minValue = std::numeric_limits<TypeArg>::lowest();
120      constexpr static const TypeArg maxValue = std::numeric_limits<TypeArg>::max();
121  
122      static JSValue toJSValue(Type value)
123      {
124          return jsDoubleNumber(purifyNaN(value));
125      }
126  
127      static double toDouble(Type value)
128      {
129          return static_cast<double>(value);
130      }
131  
132      static Type toNativeFromInt32(int32_t value)
133      {
134          return static_cast<Type>(value);
135      }
136  
137      static Type toNativeFromUint32(uint32_t value)
138      {
139          return static_cast<Type>(value);
140      }
141  
142      static Type toNativeFromDouble(double value)
143      {
144          return static_cast<Type>(value);
145      }
146  
147      template<typename OtherAdaptor>
148      static typename OtherAdaptor::Type convertTo(Type value)
149      {
150          return OtherAdaptor::toNativeFromDouble(value);
151      }
152  
153      static Optional<Type> toNativeFromInt32WithoutCoercion(int32_t value)
154      {
155          return static_cast<Type>(value);
156      }
157  
158      static Optional<Type> toNativeFromDoubleWithoutCoercion(double value)
159      {
160          if (std::isnan(value) || std::isinf(value))
161              return static_cast<Type>(value);
162  
163          Type valueResult = static_cast<Type>(value);
164  
165          if (static_cast<double>(valueResult) != value)
166              return WTF::nullopt;
167  
168          if (value < minValue || value > maxValue)
169              return WTF::nullopt;
170  
171          return valueResult;
172      }
173  };
174  
175  struct Int8Adaptor;
176  struct Int16Adaptor;
177  struct Int32Adaptor;
178  struct Uint8Adaptor;
179  struct Uint8ClampedAdaptor;
180  struct Uint16Adaptor;
181  struct Uint32Adaptor;
182  struct Float32Adaptor;
183  struct Float64Adaptor;
184  
185  template<typename Adaptor> class GenericTypedArrayView;
186  typedef GenericTypedArrayView<Int8Adaptor> Int8Array;
187  typedef GenericTypedArrayView<Int16Adaptor> Int16Array;
188  typedef GenericTypedArrayView<Int32Adaptor> Int32Array;
189  typedef GenericTypedArrayView<Uint8Adaptor> Uint8Array;
190  typedef GenericTypedArrayView<Uint8ClampedAdaptor> Uint8ClampedArray;
191  typedef GenericTypedArrayView<Uint16Adaptor> Uint16Array;
192  typedef GenericTypedArrayView<Uint32Adaptor> Uint32Array;
193  typedef GenericTypedArrayView<Float32Adaptor> Float32Array;
194  typedef GenericTypedArrayView<Float64Adaptor> Float64Array;
195  
196  template<typename Adaptor> class JSGenericTypedArrayView;
197  using JSInt8Array = JSGenericTypedArrayView<Int8Adaptor>;
198  using JSInt16Array = JSGenericTypedArrayView<Int16Adaptor>;
199  using JSInt32Array = JSGenericTypedArrayView<Int32Adaptor>;
200  using JSUint8Array = JSGenericTypedArrayView<Uint8Adaptor>;
201  using JSUint8ClampedArray = JSGenericTypedArrayView<Uint8ClampedAdaptor>;
202  using JSUint16Array = JSGenericTypedArrayView<Uint16Adaptor>;
203  using JSUint32Array = JSGenericTypedArrayView<Uint32Adaptor>;
204  using JSFloat32Array = JSGenericTypedArrayView<Float32Adaptor>;
205  using JSFloat64Array = JSGenericTypedArrayView<Float64Adaptor>;
206  
207  struct Int8Adaptor : IntegralTypedArrayAdaptor<int8_t, Int8Array, JSInt8Array, TypeInt8> { };
208  struct Int16Adaptor : IntegralTypedArrayAdaptor<int16_t, Int16Array, JSInt16Array, TypeInt16> { };
209  struct Int32Adaptor : IntegralTypedArrayAdaptor<int32_t, Int32Array, JSInt32Array, TypeInt32> { };
210  struct Uint8Adaptor : IntegralTypedArrayAdaptor<uint8_t, Uint8Array, JSUint8Array, TypeUint8> { };
211  struct Uint16Adaptor : IntegralTypedArrayAdaptor<uint16_t, Uint16Array, JSUint16Array, TypeUint16> { };
212  struct Uint32Adaptor : IntegralTypedArrayAdaptor<uint32_t, Uint32Array, JSUint32Array, TypeUint32> { };
213  struct Float32Adaptor : FloatTypedArrayAdaptor<float, Float32Array, JSFloat32Array, TypeFloat32> { };
214  struct Float64Adaptor : FloatTypedArrayAdaptor<double, Float64Array, JSFloat64Array, TypeFloat64> { };
215  
216  struct Uint8ClampedAdaptor {
217      typedef uint8_t Type;
218      typedef Uint8ClampedArray ViewType;
219      typedef JSUint8ClampedArray JSViewType;
220      static const TypedArrayType typeValue = TypeUint8Clamped;
221      constexpr static const uint8_t minValue = std::numeric_limits<uint8_t>::lowest();
222      constexpr static const uint8_t maxValue = std::numeric_limits<uint8_t>::max();
223  
224      static JSValue toJSValue(uint8_t value)
225      {
226          return jsNumber(value);
227      }
228  
229      static double toDouble(uint8_t value)
230      {
231          return static_cast<double>(value);
232      }
233  
234      static Type toNativeFromInt32(int32_t value)
235      {
236          return clamp(value);
237      }
238  
239      static Type toNativeFromUint32(uint32_t value)
240      {
241          return std::min(static_cast<uint32_t>(255), value);
242      }
243  
244      static Type toNativeFromDouble(double value)
245      {
246          if (std::isnan(value) || value < 0)
247              return 0;
248          if (value > 255)
249              return 255;
250          return static_cast<uint8_t>(lrint(value));
251      }
252  
253      template<typename OtherAdaptor>
254      static typename OtherAdaptor::Type convertTo(uint8_t value)
255      {
256          return OtherAdaptor::toNativeFromInt32(value);
257      }
258      
259      static Optional<Type> toNativeFromInt32WithoutCoercion(int32_t value)
260      {
261          if (value > maxValue || value < minValue)
262              return WTF::nullopt;
263  
264          return static_cast<Type>(value);
265      }
266  
267      static Optional<Type> toNativeFromDoubleWithoutCoercion(double value)
268      {
269          uint8_t integer = static_cast<uint8_t>(value);
270          if (static_cast<double>(integer) != value)
271              return WTF::nullopt;
272  
273          return integer;
274      }
275  
276  private:
277      static uint8_t clamp(int32_t value)
278      {
279          if (value < 0)
280              return 0;
281          if (value > 255)
282              return 255;
283          return static_cast<uint8_t>(value);
284      }
285  };
286  
287  } // namespace JSC