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 java.nio.ByteBuffer;
29 import java.util.Arrays;
30 import jdk.nashorn.internal.objects.annotations.Attribute;
31 import jdk.nashorn.internal.objects.annotations.Constructor;
32 import jdk.nashorn.internal.objects.annotations.Function;
33 import jdk.nashorn.internal.objects.annotations.Getter;
34 import jdk.nashorn.internal.objects.annotations.ScriptClass;
35 import jdk.nashorn.internal.runtime.JSType;
36 import jdk.nashorn.internal.runtime.PropertyMap;
37 import jdk.nashorn.internal.runtime.ScriptObject;
38 import jdk.nashorn.internal.runtime.ScriptRuntime;
39
40 @ScriptClass("ArrayBuffer")
41 final class NativeArrayBuffer extends ScriptObject {
42 private final byte[] buffer;
43
44 // initialized by nasgen
45 private static PropertyMap $nasgenmap$;
46
47 @Constructor(arity = 1)
48 public static Object constructor(final boolean newObj, final Object self, final Object... args) {
49 if (args.length == 0) {
50 throw new RuntimeException("missing length argument");
51 }
52
53 return new NativeArrayBuffer(JSType.toInt32(args[0]));
54 }
55
56 protected NativeArrayBuffer(final byte[] byteArray, final Global global) {
57 super(global.getArrayBufferPrototype(), $nasgenmap$);
58 this.buffer = byteArray;
59 }
60
61 protected NativeArrayBuffer(final byte[] byteArray) {
62 this(byteArray, Global.instance());
63 }
64
65 protected NativeArrayBuffer(final int byteLength) {
66 this(new byte[byteLength]);
67 }
68
69 protected NativeArrayBuffer(final NativeArrayBuffer other, final int begin, final int end) {
70 this(Arrays.copyOfRange(other.buffer, begin, end));
71 }
72
73 @Override
74 public String getClassName() {
75 return "ArrayBuffer";
76 }
77
78 @Getter(attributes = Attribute.NOT_ENUMERABLE | Attribute.NOT_WRITABLE | Attribute.NOT_CONFIGURABLE)
79 public static Object byteLength(final Object self) {
80 return ((NativeArrayBuffer)self).buffer.length;
81 }
82
83 @Function(attributes = Attribute.NOT_ENUMERABLE)
84 public static Object slice(final Object self, final Object begin0, final Object end0) {
85 final NativeArrayBuffer arrayBuffer = (NativeArrayBuffer)self;
86 int begin = JSType.toInt32(begin0);
87 int end = end0 != ScriptRuntime.UNDEFINED ? JSType.toInt32(end0) : arrayBuffer.getByteLength();
88 begin = adjustIndex(begin, arrayBuffer.getByteLength());
89 end = adjustIndex(end, arrayBuffer.getByteLength());
90 return new NativeArrayBuffer((NativeArrayBuffer) self, begin, Math.max(end, begin));
91 }
92
93 /**
94 * If index is negative, it refers to an index from the end of the array, as
95 * opposed to from the beginning. The index is clamped to the valid index
96 * range for the array.
97 *
98 * @param index The index.
99 * @param length The length of the array.
100 * @return valid index index in the range [0, length).
101 */
102 static int adjustIndex(final int index, final int length) {
103 if (index < 0) {
104 return clamp(index + length, length);
105 }
106 return clamp(index, length);
107 }
108
109 /**
110 * Clamp index into the range [0, length).
111 */
112 private static int clamp(final int index, final int length) {
113 if (index < 0) {
114 return 0;
115 } else if (index > length) {
116 return length;
117 }
118 return index;
119 }
120
121 public byte[] getByteArray() {
122 return buffer;
123 }
124
125 public int getByteLength() {
126 return buffer.length;
127 }
128
129 ByteBuffer getBuffer() {
130 return ByteBuffer.wrap(buffer);
131 }
132
133 ByteBuffer getBuffer(final int offset) {
134 return ByteBuffer.wrap(buffer, offset, buffer.length - offset);
135 }
136
137 ByteBuffer getBuffer(final int offset, final int length) {
138 return ByteBuffer.wrap(buffer, offset, length);
139 }
140 }
--- EOF ---