1 /*
   2  * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package jdk.nashorn.internal.objects;
  27 
  28 import static jdk.nashorn.internal.runtime.ECMAErrors.rangeError;
  29 
  30 import jdk.nashorn.internal.objects.annotations.Attribute;
  31 import jdk.nashorn.internal.objects.annotations.Getter;
  32 import jdk.nashorn.internal.objects.annotations.ScriptClass;
  33 import jdk.nashorn.internal.runtime.JSType;
  34 import jdk.nashorn.internal.runtime.PropertyMap;
  35 import jdk.nashorn.internal.runtime.ScriptObject;
  36 import jdk.nashorn.internal.runtime.ScriptRuntime;
  37 import jdk.nashorn.internal.runtime.arrays.ArrayData;
  38 
  39 @ScriptClass("ArrayBufferView")
  40 abstract class ArrayBufferView extends ScriptObject {
  41 
  42     // initialized by nasgen
  43     private static PropertyMap $nasgenmap$;
  44 
  45     static PropertyMap getInitialMap() {
  46         return $nasgenmap$;
  47     }
  48 
  49     private ArrayBufferView(final NativeArrayBuffer buffer, final int byteOffset, final int elementLength, final Global global) {
  50         super(getInitialMap());
  51         checkConstructorArgs(buffer, byteOffset, elementLength);
  52         this.setProto(getPrototype(global));
  53         this.setArray(factory().createArrayData(buffer, byteOffset, elementLength));
  54     }
  55 
  56     ArrayBufferView(final NativeArrayBuffer buffer, final int byteOffset, final int elementLength) {
  57         this(buffer, byteOffset, elementLength, Global.instance());
  58     }
  59 
  60     private void checkConstructorArgs(final NativeArrayBuffer buffer, final int byteOffset, final int elementLength) {
  61         if (byteOffset < 0 || elementLength < 0) {
  62             throw new RuntimeException("byteOffset or length must not be negative");
  63         }
  64         if (byteOffset + elementLength * bytesPerElement() > buffer.getByteLength()) {
  65             throw new RuntimeException("byteOffset + byteLength out of range");
  66         }
  67         if (byteOffset % bytesPerElement() != 0) {
  68             throw new RuntimeException("byteOffset must be a multiple of the element size");
  69         }
  70     }
  71 
  72     private int bytesPerElement() {
  73         return factory().bytesPerElement;
  74     }
  75 
  76     @Getter(attributes = Attribute.NOT_ENUMERABLE | Attribute.NOT_WRITABLE | Attribute.NOT_CONFIGURABLE)
  77     public static Object buffer(final Object self) {
  78         return ((ArrayDataImpl)((ArrayBufferView)self).getArray()).buffer;
  79     }
  80 
  81     @Getter(attributes = Attribute.NOT_ENUMERABLE | Attribute.NOT_WRITABLE | Attribute.NOT_CONFIGURABLE)
  82     public static Object byteOffset(final Object self) {
  83         return ((ArrayDataImpl)((ArrayBufferView)self).getArray()).byteOffset;
  84     }
  85 
  86     @Getter(attributes = Attribute.NOT_ENUMERABLE | Attribute.NOT_WRITABLE | Attribute.NOT_CONFIGURABLE)
  87     public static Object byteLength(final Object self) {
  88         final ArrayBufferView view = (ArrayBufferView)self;
  89         return ((ArrayDataImpl)view.getArray()).elementLength * view.bytesPerElement();
  90     }
  91 
  92     @Getter(attributes = Attribute.NOT_ENUMERABLE | Attribute.NOT_WRITABLE | Attribute.NOT_CONFIGURABLE)
  93     public static Object length(final Object self) {
  94         return ((ArrayBufferView)self).elementLength();
  95     }
  96 
  97     @Override
  98     public final Object getLength() {
  99         return elementLength();
 100     }
 101 
 102     private int elementLength() {
 103         return ((ArrayDataImpl)getArray()).elementLength;
 104     }
 105 
 106     protected static abstract class ArrayDataImpl extends ArrayData {
 107         protected final NativeArrayBuffer buffer;
 108         protected final int byteOffset;
 109         private final int elementLength;
 110 
 111         protected ArrayDataImpl(final NativeArrayBuffer buffer, final int byteOffset, final int elementLength) {
 112             super(elementLength);
 113             this.buffer = buffer;
 114             this.byteOffset = byteOffset;
 115             this.elementLength = elementLength;
 116         }
 117 
 118         @Override
 119         public ArrayData copy() {
 120             throw new UnsupportedOperationException();   // Not used for ArrayBuffers
 121         }
 122 
 123         @Override
 124         public Object[] asObjectArray() {
 125             final Object[] array = new Object[elementLength];
 126             for (int i = 0; i < elementLength; i++) {
 127                 array[i] = getObjectImpl(i);
 128             }
 129             return array;
 130         }
 131 
 132         @Override
 133         public ArrayData ensure(final long safeIndex) {
 134             return this;
 135         }
 136 
 137         @Override
 138         public void setLength(final long length) {
 139             //empty?
 140             //TODO is this right?
 141         }
 142 
 143         @Override
 144         public ArrayData shrink(final long newLength) {
 145             return this;
 146         }
 147 
 148         @Override
 149         public ArrayData set(final int index, final Object value, final boolean strict) {
 150             if (has(index)) {
 151                 setImpl(index, value);
 152             }
 153             return this;
 154         }
 155 
 156         @Override
 157         public ArrayData set(final int index, final int value, final boolean strict) {
 158             if (has(index)) {
 159                 setImpl(index, value);
 160             }
 161             return this;
 162         }
 163 
 164         @Override
 165         public ArrayData set(final int index, final long value, final boolean strict) {
 166             if (has(index)) {
 167                 setImpl(index, value);
 168             }
 169             return this;
 170         }
 171 
 172         @Override
 173         public ArrayData set(final int index, final double value, final boolean strict) {
 174             if (has(index)) {
 175                 setImpl(index, value);
 176             }
 177             return this;
 178         }
 179 
 180         @Override
 181         public int getInt(final int index) {
 182             return getIntImpl(index);
 183         }
 184 
 185         @Override
 186         public long getLong(final int index) {
 187             return getLongImpl(index);
 188         }
 189 
 190         @Override
 191         public double getDouble(final int index) {
 192             return getDoubleImpl(index);
 193         }
 194 
 195         @Override
 196         public Object getObject(final int index) {
 197             return getObjectImpl(index);
 198         }
 199 
 200         @Override
 201         public boolean has(final int index) {
 202             return index >= 0 && index < elementLength;
 203         }
 204 
 205         @Override
 206         public boolean canDelete(final int index, final boolean strict) {
 207             return false;
 208         }
 209 
 210         @Override
 211         public boolean canDelete(final long fromIndex, final long toIndex, final boolean strict) {
 212             return false;
 213         }
 214 
 215         @Override
 216         public ArrayData delete(final int index) {
 217             return this;
 218         }
 219 
 220         @Override
 221         public ArrayData delete(final long fromIndex, final long toIndex) {
 222             return this;
 223         }
 224 
 225         @Override
 226         protected ArrayData convert(final Class<?> type) {
 227             return this;
 228         }
 229 
 230         @Override
 231         public void shiftLeft(final int by) {
 232             throw new UnsupportedOperationException();
 233         }
 234 
 235         @Override
 236         public ArrayData shiftRight(final int by) {
 237             throw new UnsupportedOperationException();
 238         }
 239 
 240         @Override
 241         public Object pop() {
 242             throw new UnsupportedOperationException();
 243         }
 244 
 245         @Override
 246         public ArrayData slice(final long from, final long to) {
 247             throw new UnsupportedOperationException();
 248         }
 249 
 250         protected abstract int getIntImpl(int key);
 251 
 252         protected long getLongImpl(final int key) {
 253             return getIntImpl(key);
 254         }
 255 
 256         protected double getDoubleImpl(final int key) {
 257             return getIntImpl(key);
 258         }
 259 
 260         protected Object getObjectImpl(final int key) {
 261             return getIntImpl(key);
 262         }
 263 
 264         protected abstract void setImpl(int key, int value);
 265 
 266         protected void setImpl(final int key, final long value) {
 267             setImpl(key, (int)value);
 268         }
 269 
 270         protected void setImpl(final int key, final double value) {
 271             setImpl(key, JSType.toInt32(value));
 272         }
 273 
 274         protected void setImpl(final int key, final Object value) {
 275             setImpl(key, JSType.toInt32(value));
 276         }
 277 
 278         protected abstract int byteIndex(int index);
 279     }
 280 
 281     protected static abstract class Factory {
 282         final int bytesPerElement;
 283         final int maxElementLength;
 284 
 285         public Factory(final int bytesPerElement) {
 286             this.bytesPerElement = bytesPerElement;
 287             this.maxElementLength = Integer.MAX_VALUE / bytesPerElement;
 288         }
 289 
 290         public final ArrayBufferView construct(final int elementLength) {
 291             if(elementLength > maxElementLength) {
 292                 throw rangeError("inappropriate.array.buffer.length", JSType.toString(elementLength));
 293             }
 294             return construct(new NativeArrayBuffer(elementLength * bytesPerElement), 0, elementLength);
 295         }
 296 
 297         public abstract ArrayBufferView construct(NativeArrayBuffer buffer, int byteOffset, int elementLength);
 298 
 299         public abstract ArrayData createArrayData(NativeArrayBuffer buffer, int byteOffset, int elementLength);
 300     }
 301 
 302     protected abstract Factory factory();
 303 
 304     protected abstract ScriptObject getPrototype(final Global global);
 305 
 306     protected boolean isFloatArray() {
 307         return false;
 308     }
 309 
 310     protected static ArrayBufferView constructorImpl(final Object[] args, final Factory factory) {
 311         final Object arg0 = args.length != 0 ? args[0] : 0;
 312         final ArrayBufferView dst;
 313         final int length;
 314         if (arg0 instanceof NativeArrayBuffer) {
 315             // Constructor(ArrayBuffer buffer, optional unsigned long byteOffset, optional unsigned long length)
 316             final NativeArrayBuffer buffer = (NativeArrayBuffer) arg0;
 317             final int byteOffset = args.length > 1 ? JSType.toInt32(args[1]) : 0;
 318             if (args.length > 2) {
 319                 length = JSType.toInt32(args[2]);
 320             } else {
 321                 if ((buffer.getByteLength() - byteOffset) % factory.bytesPerElement != 0) {
 322                     throw new RuntimeException("buffer.byteLength - byteOffset must be a multiple of the element size");
 323                 }
 324                 length = (buffer.getByteLength() - byteOffset) / factory.bytesPerElement;
 325             }
 326             return factory.construct(buffer, byteOffset, length);
 327         } else if (arg0 instanceof ArrayBufferView) {
 328             // Constructor(TypedArray array)
 329             length = ((ArrayBufferView)arg0).elementLength();
 330             dst = factory.construct(length);
 331         } else if (arg0 instanceof NativeArray) {
 332             // Constructor(type[] array)
 333             length = lengthToInt(((NativeArray) arg0).getArray().length());
 334             dst = factory.construct(length);
 335         } else {
 336             // Constructor(unsigned long length)
 337             length = lengthToInt(JSType.toInt64(arg0));
 338             return factory.construct(length);
 339         }
 340 
 341         copyElements(dst, length, (ScriptObject)arg0, 0);
 342         return dst;
 343     }
 344 
 345     protected static Object setImpl(final Object self, final Object array, final Object offset0) {
 346         final ArrayBufferView dest = ((ArrayBufferView)self);
 347         final int length;
 348         if (array instanceof ArrayBufferView) {
 349             // void set(TypedArray array, optional unsigned long offset)
 350             length = ((ArrayBufferView)array).elementLength();
 351         } else if (array instanceof NativeArray) {
 352             // void set(type[] array, optional unsigned long offset)
 353             length = (int) (((NativeArray) array).getArray().length() & 0x7fff_ffff);
 354         } else {
 355             throw new RuntimeException("argument is not of array type");
 356         }
 357 
 358         final ScriptObject source = (ScriptObject) array;
 359         final int offset = JSType.toInt32(offset0); // default=0
 360 
 361         if (dest.elementLength() < length + offset || offset < 0) {
 362             throw new RuntimeException("offset or array length out of bounds");
 363         }
 364 
 365         copyElements(dest, length, source, offset);
 366 
 367         return ScriptRuntime.UNDEFINED;
 368     }
 369 
 370     private static void copyElements(final ArrayBufferView dest, final int length, final ScriptObject source, final int offset) {
 371         if (!dest.isFloatArray()) {
 372             for (int i = 0, j = offset; i < length; i++, j++) {
 373                 dest.set(j, source.getInt(i), false);
 374             }
 375         } else {
 376             for (int i = 0, j = offset; i < length; i++, j++) {
 377                 dest.set(j, source.getDouble(i), false);
 378             }
 379         }
 380     }
 381 
 382     private static int lengthToInt(final long length) {
 383         if (length > Integer.MAX_VALUE || length < 0) {
 384             throw rangeError("inappropriate.array.buffer.length", JSType.toString(length));
 385         }
 386         return (int) (length & Integer.MAX_VALUE);
 387     }
 388 
 389     protected static Object subarrayImpl(final Object self, final Object begin0, final Object end0) {
 390         final ArrayBufferView arrayView = ((ArrayBufferView)self);
 391         final int elementLength = arrayView.elementLength();
 392         final int begin = NativeArrayBuffer.adjustIndex(JSType.toInt32(begin0), elementLength);
 393         final int end = NativeArrayBuffer.adjustIndex(end0 != ScriptRuntime.UNDEFINED ? JSType.toInt32(end0) : elementLength, elementLength);
 394         final ArrayDataImpl arrayData = (ArrayDataImpl)arrayView.getArray();
 395         return arrayView.factory().construct(arrayData.buffer, arrayData.byteIndex(begin), Math.max(end - begin, 0));
 396     }
 397 }
--- EOF ---