--- old/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/objects/NativeArrayBuffer.java 2020-04-15 18:48:35.000000000 +0530 +++ /dev/null 2020-04-15 18:48:35.000000000 +0530 @@ -1,241 +0,0 @@ -/* - * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved. - * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. - * - * This code is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License version 2 only, as - * published by the Free Software Foundation. Oracle designates this - * particular file as subject to the "Classpath" exception as provided - * by Oracle in the LICENSE file that accompanied this code. - * - * This code is distributed in the hope that it will be useful, but WITHOUT - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License - * version 2 for more details (a copy is included in the LICENSE file that - * accompanied this code). - * - * You should have received a copy of the GNU General Public License version - * 2 along with this work; if not, write to the Free Software Foundation, - * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. - * - * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA - * or visit www.oracle.com if you need additional information or have any - * questions. - */ - -package jdk.nashorn.internal.objects; - -import static jdk.nashorn.internal.runtime.ECMAErrors.typeError; - -import java.nio.ByteBuffer; - -import jdk.nashorn.internal.objects.annotations.Attribute; -import jdk.nashorn.internal.objects.annotations.Constructor; -import jdk.nashorn.internal.objects.annotations.Function; -import jdk.nashorn.internal.objects.annotations.Getter; -import jdk.nashorn.internal.objects.annotations.ScriptClass; -import jdk.nashorn.internal.objects.annotations.SpecializedFunction; -import jdk.nashorn.internal.objects.annotations.Where; -import jdk.nashorn.internal.runtime.JSType; -import jdk.nashorn.internal.runtime.PropertyMap; -import jdk.nashorn.internal.runtime.ScriptObject; -import jdk.nashorn.internal.runtime.ScriptRuntime; - -/** - * NativeArrayBuffer - ArrayBuffer as described in the JS typed - * array spec - */ -@ScriptClass("ArrayBuffer") -public final class NativeArrayBuffer extends ScriptObject { - private final ByteBuffer nb; - - // initialized by nasgen - private static PropertyMap $nasgenmap$; - - /** - * Constructor - * @param nb native byte buffer to wrap - * @param global global instance - */ - protected NativeArrayBuffer(final ByteBuffer nb, final Global global) { - super(global.getArrayBufferPrototype(), $nasgenmap$); - this.nb = nb; - } - - /** - * Constructor - * @param nb native byte buffer to wrap - */ - protected NativeArrayBuffer(final ByteBuffer nb) { - this(nb, Global.instance()); - } - - /** - * Constructor - * @param byteLength byteLength for buffer - */ - protected NativeArrayBuffer(final int byteLength) { - this(ByteBuffer.allocateDirect(byteLength)); - } - - /** - * Clone constructor - * Used only for slice - * @param other original buffer - * @param begin begin byte index - * @param end end byte index - */ - protected NativeArrayBuffer(final NativeArrayBuffer other, final int begin, final int end) { - this(cloneBuffer(other.getNioBuffer(), begin, end)); - } - - /** - * Constructor - * @param newObj is this invoked with new - * @param self self reference - * @param args arguments to constructor - * @return new NativeArrayBuffer - */ - @Constructor(arity = 1) - public static NativeArrayBuffer constructor(final boolean newObj, final Object self, final Object... args) { - if (!newObj) { - throw typeError("constructor.requires.new", "ArrayBuffer"); - } - - if (args.length == 0) { - return new NativeArrayBuffer(0); - } - - final Object arg0 = args[0]; - if (arg0 instanceof ByteBuffer) { - return new NativeArrayBuffer((ByteBuffer)arg0); - } else { - return new NativeArrayBuffer(JSType.toInt32(arg0)); - } - } - - private static ByteBuffer cloneBuffer(final ByteBuffer original, final int begin, final int end) { - final ByteBuffer clone = ByteBuffer.allocateDirect(original.capacity()); - original.rewind();//copy from the beginning - clone.put(original); - original.rewind(); - clone.flip(); - clone.position(begin); - clone.limit(end); - return clone.slice(); - } - - ByteBuffer getNioBuffer() { - return nb; - } - - @Override - public String getClassName() { - return "ArrayBuffer"; - } - - /** - * Byte length for native array buffer - * @param self native array buffer - * @return byte length - */ - @Getter(attributes = Attribute.NOT_ENUMERABLE | Attribute.NOT_WRITABLE | Attribute.NOT_CONFIGURABLE) - public static int byteLength(final Object self) { - return ((NativeArrayBuffer)self).getByteLength(); - } - - /** - * Returns true if an object is an ArrayBufferView - * - * @param self self - * @param obj object to check - * - * @return true if obj is an ArrayBufferView - */ - @Function(attributes = Attribute.NOT_ENUMERABLE, where = Where.CONSTRUCTOR) - public static boolean isView(final Object self, final Object obj) { - return obj instanceof ArrayBufferView; - } - - /** - * Slice function - * @param self native array buffer - * @param begin0 start byte index - * @param end0 end byte index - * @return new array buffer, sliced - */ - @Function(attributes = Attribute.NOT_ENUMERABLE) - public static NativeArrayBuffer slice(final Object self, final Object begin0, final Object end0) { - final NativeArrayBuffer arrayBuffer = (NativeArrayBuffer)self; - final int byteLength = arrayBuffer.getByteLength(); - final int begin = adjustIndex(JSType.toInt32(begin0), byteLength); - final int end = adjustIndex(end0 != ScriptRuntime.UNDEFINED ? JSType.toInt32(end0) : byteLength, byteLength); - return new NativeArrayBuffer(arrayBuffer, begin, Math.max(end, begin)); - } - - /** - * Specialized slice function - * @param self native array buffer - * @param begin start byte index - * @param end end byte index - * @return new array buffer, sliced - */ - @SpecializedFunction - public static Object slice(final Object self, final int begin, final int end) { - final NativeArrayBuffer arrayBuffer = (NativeArrayBuffer)self; - final int byteLength = arrayBuffer.getByteLength(); - return new NativeArrayBuffer(arrayBuffer, adjustIndex(begin, byteLength), Math.max(adjustIndex(end, byteLength), begin)); - } - - /** - * Specialized slice function - * @param self native array buffer - * @param begin start byte index - * @return new array buffer, sliced - */ - @SpecializedFunction - public static Object slice(final Object self, final int begin) { - return slice(self, begin, ((NativeArrayBuffer)self).getByteLength()); - } - - /** - * If index is negative, it refers to an index from the end of the array, as - * opposed to from the beginning. The index is clamped to the valid index - * range for the array. - * - * @param index The index. - * @param length The length of the array. - * @return valid index index in the range [0, length). - */ - static int adjustIndex(final int index, final int length) { - return index < 0 ? clamp(index + length, length) : clamp(index, length); - } - - /** - * Clamp index into the range [0, length). - */ - private static int clamp(final int index, final int length) { - if (index < 0) { - return 0; - } else if (index > length) { - return length; - } - return index; - } - - int getByteLength() { - return nb.limit(); - } - - ByteBuffer getBuffer() { - return nb; - } - - ByteBuffer getBuffer(final int offset) { - return nb.duplicate().position(offset); - } - - ByteBuffer getBuffer(final int offset, final int length) { - return getBuffer(offset).limit(length); - } -}