Mercurial > jdk8-mips64-public > langtools / file comparison

comparison: src/share/classes/com/sun/tools/javac/util/ByteBuffer.java

src/share/classes/com/sun/tools/javac/util/ByteBuffer.java

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1 /*
2 * Copyright 1999-2005 Sun Microsystems, Inc. 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. Sun designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22 * CA 95054 USA or visit www.sun.com if you need additional information or
23 * have any questions.
24 */
25
26 package com.sun.tools.javac.util;
27
28 import java.io.*;
29
30 /** A byte buffer is a flexible array which grows when elements are
31 * appended. There are also methods to append names to byte buffers
32 * and to convert byte buffers to names.
33 *
34 * <p><b>This is NOT part of any API supported by Sun Microsystems. If
35 * you write code that depends on this, you do so at your own risk.
36 * This code and its internal interfaces are subject to change or
37 * deletion without notice.</b>
38 */
39 public class ByteBuffer {
40
41 /** An array holding the bytes in this buffer; can be grown.
42 */
43 public byte[] elems;
44
45 /** The current number of defined bytes in this buffer.
46 */
47 public int length;
48
49 /** Create a new byte buffer.
50 */
51 public ByteBuffer() {
52 this(64);
53 }
54
55 /** Create a new byte buffer with an initial elements array
56 * of given size.
57 */
58 public ByteBuffer(int initialSize) {
59 elems = new byte[initialSize];
60 length = 0;
61 }
62
63 private void copy(int size) {
64 byte[] newelems = new byte[size];
65 System.arraycopy(elems, 0, newelems, 0, elems.length);
66 elems = newelems;
67 }
68
69 /** Append byte to this buffer.
70 */
71 public void appendByte(int b) {
72 if (length >= elems.length) copy(elems.length * 2);
73 elems[length++] = (byte)b;
74 }
75
76 /** Append `len' bytes from byte array,
77 * starting at given `start' offset.
78 */
79 public void appendBytes(byte[] bs, int start, int len) {
80 while (length + len > elems.length) copy(elems.length * 2);
81 System.arraycopy(bs, start, elems, length, len);
82 length += len;
83 }
84
85 /** Append all bytes from given byte array.
86 */
87 public void appendBytes(byte[] bs) {
88 appendBytes(bs, 0, bs.length);
89 }
90
91 /** Append a character as a two byte number.
92 */
93 public void appendChar(int x) {
94 while (length + 1 >= elems.length) copy(elems.length * 2);
95 elems[length ] = (byte)((x >> 8) & 0xFF);
96 elems[length+1] = (byte)((x ) & 0xFF);
97 length = length + 2;
98 }
99
100 /** Append an integer as a four byte number.
101 */
102 public void appendInt(int x) {
103 while (length + 3 >= elems.length) copy(elems.length * 2);
104 elems[length ] = (byte)((x >> 24) & 0xFF);
105 elems[length+1] = (byte)((x >> 16) & 0xFF);
106 elems[length+2] = (byte)((x >> 8) & 0xFF);
107 elems[length+3] = (byte)((x ) & 0xFF);
108 length = length + 4;
109 }
110
111 /** Append a long as an eight byte number.
112 */
113 public void appendLong(long x) {
114 ByteArrayOutputStream buffer = new ByteArrayOutputStream(8);
115 DataOutputStream bufout = new DataOutputStream(buffer);
116 try {
117 bufout.writeLong(x);
118 appendBytes(buffer.toByteArray(), 0, 8);
119 } catch (IOException e) {
120 throw new AssertionError("write");
121 }
122 }
123
124 /** Append a float as a four byte number.
125 */
126 public void appendFloat(float x) {
127 ByteArrayOutputStream buffer = new ByteArrayOutputStream(4);
128 DataOutputStream bufout = new DataOutputStream(buffer);
129 try {
130 bufout.writeFloat(x);
131 appendBytes(buffer.toByteArray(), 0, 4);
132 } catch (IOException e) {
133 throw new AssertionError("write");
134 }
135 }
136
137 /** Append a double as a eight byte number.
138 */
139 public void appendDouble(double x) {
140 ByteArrayOutputStream buffer = new ByteArrayOutputStream(8);
141 DataOutputStream bufout = new DataOutputStream(buffer);
142 try {
143 bufout.writeDouble(x);
144 appendBytes(buffer.toByteArray(), 0, 8);
145 } catch (IOException e) {
146 throw new AssertionError("write");
147 }
148 }
149
150 /** Append a name.
151 */
152 public void appendName(Name name) {
153 appendBytes(name.table.names, name.index, name.len);
154 }
155
156 /** Reset to zero length.
157 */
158 public void reset() {
159 length = 0;
160 }
161
162 /** Convert contents to name.
163 */
164 public Name toName(Name.Table names) {
165 return names.fromUtf(elems, 0, length);
166 }
167 }

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