1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/classes/com/sun/tools/javac/util/ByteBuffer.java Wed Apr 27 01:34:52 2016 +0800
1.3 @@ -0,0 +1,161 @@
1.4 +/*
1.5 + * Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation. Oracle designates this
1.11 + * particular file as subject to the "Classpath" exception as provided
1.12 + * by Oracle in the LICENSE file that accompanied this code.
1.13 + *
1.14 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.15 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.16 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.17 + * version 2 for more details (a copy is included in the LICENSE file that
1.18 + * accompanied this code).
1.19 + *
1.20 + * You should have received a copy of the GNU General Public License version
1.21 + * 2 along with this work; if not, write to the Free Software Foundation,
1.22 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.23 + *
1.24 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.25 + * or visit www.oracle.com if you need additional information or have any
1.26 + * questions.
1.27 + */
1.28 +
1.29 +package com.sun.tools.javac.util;
1.30 +
1.31 +import java.io.*;
1.32 +
1.33 +/** A byte buffer is a flexible array which grows when elements are
1.34 + * appended. There are also methods to append names to byte buffers
1.35 + * and to convert byte buffers to names.
1.36 + *
1.37 + * <p><b>This is NOT part of any supported API.
1.38 + * If you write code that depends on this, you do so at your own risk.
1.39 + * This code and its internal interfaces are subject to change or
1.40 + * deletion without notice.</b>
1.41 + */
1.42 +public class ByteBuffer {
1.43 +
1.44 + /** An array holding the bytes in this buffer; can be grown.
1.45 + */
1.46 + public byte[] elems;
1.47 +
1.48 + /** The current number of defined bytes in this buffer.
1.49 + */
1.50 + public int length;
1.51 +
1.52 + /** Create a new byte buffer.
1.53 + */
1.54 + public ByteBuffer() {
1.55 + this(64);
1.56 + }
1.57 +
1.58 + /** Create a new byte buffer with an initial elements array
1.59 + * of given size.
1.60 + */
1.61 + public ByteBuffer(int initialSize) {
1.62 + elems = new byte[initialSize];
1.63 + length = 0;
1.64 + }
1.65 +
1.66 + /** Append byte to this buffer.
1.67 + */
1.68 + public void appendByte(int b) {
1.69 + elems = ArrayUtils.ensureCapacity(elems, length);
1.70 + elems[length++] = (byte)b;
1.71 + }
1.72 +
1.73 + /** Append `len' bytes from byte array,
1.74 + * starting at given `start' offset.
1.75 + */
1.76 + public void appendBytes(byte[] bs, int start, int len) {
1.77 + elems = ArrayUtils.ensureCapacity(elems, length + len);
1.78 + System.arraycopy(bs, start, elems, length, len);
1.79 + length += len;
1.80 + }
1.81 +
1.82 + /** Append all bytes from given byte array.
1.83 + */
1.84 + public void appendBytes(byte[] bs) {
1.85 + appendBytes(bs, 0, bs.length);
1.86 + }
1.87 +
1.88 + /** Append a character as a two byte number.
1.89 + */
1.90 + public void appendChar(int x) {
1.91 + elems = ArrayUtils.ensureCapacity(elems, length + 1);
1.92 + elems[length ] = (byte)((x >> 8) & 0xFF);
1.93 + elems[length+1] = (byte)((x ) & 0xFF);
1.94 + length = length + 2;
1.95 + }
1.96 +
1.97 + /** Append an integer as a four byte number.
1.98 + */
1.99 + public void appendInt(int x) {
1.100 + elems = ArrayUtils.ensureCapacity(elems, length + 3);
1.101 + elems[length ] = (byte)((x >> 24) & 0xFF);
1.102 + elems[length+1] = (byte)((x >> 16) & 0xFF);
1.103 + elems[length+2] = (byte)((x >> 8) & 0xFF);
1.104 + elems[length+3] = (byte)((x ) & 0xFF);
1.105 + length = length + 4;
1.106 + }
1.107 +
1.108 + /** Append a long as an eight byte number.
1.109 + */
1.110 + public void appendLong(long x) {
1.111 + ByteArrayOutputStream buffer = new ByteArrayOutputStream(8);
1.112 + DataOutputStream bufout = new DataOutputStream(buffer);
1.113 + try {
1.114 + bufout.writeLong(x);
1.115 + appendBytes(buffer.toByteArray(), 0, 8);
1.116 + } catch (IOException e) {
1.117 + throw new AssertionError("write");
1.118 + }
1.119 + }
1.120 +
1.121 + /** Append a float as a four byte number.
1.122 + */
1.123 + public void appendFloat(float x) {
1.124 + ByteArrayOutputStream buffer = new ByteArrayOutputStream(4);
1.125 + DataOutputStream bufout = new DataOutputStream(buffer);
1.126 + try {
1.127 + bufout.writeFloat(x);
1.128 + appendBytes(buffer.toByteArray(), 0, 4);
1.129 + } catch (IOException e) {
1.130 + throw new AssertionError("write");
1.131 + }
1.132 + }
1.133 +
1.134 + /** Append a double as a eight byte number.
1.135 + */
1.136 + public void appendDouble(double x) {
1.137 + ByteArrayOutputStream buffer = new ByteArrayOutputStream(8);
1.138 + DataOutputStream bufout = new DataOutputStream(buffer);
1.139 + try {
1.140 + bufout.writeDouble(x);
1.141 + appendBytes(buffer.toByteArray(), 0, 8);
1.142 + } catch (IOException e) {
1.143 + throw new AssertionError("write");
1.144 + }
1.145 + }
1.146 +
1.147 + /** Append a name.
1.148 + */
1.149 + public void appendName(Name name) {
1.150 + appendBytes(name.getByteArray(), name.getByteOffset(), name.getByteLength());
1.151 + }
1.152 +
1.153 + /** Reset to zero length.
1.154 + */
1.155 + public void reset() {
1.156 + length = 0;
1.157 + }
1.158 +
1.159 + /** Convert contents to name.
1.160 + */
1.161 + public Name toName(Names names) {
1.162 + return names.fromUtf(elems, 0, length);
1.163 + }
1.164 +}
