1 /*
2  * $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk/module-main/src/main/java/org/apache/http/util/ByteArrayBuffer.java $
3  * $Revision: 496070 $
4  * $Date: 2007-01-14 04:18:34 -0800 (Sun, 14 Jan 2007) $
5  *
6  * ====================================================================
7  * Licensed to the Apache Software Foundation (ASF) under one
8  * or more contributor license agreements.  See the NOTICE file
9  * distributed with this work for additional information
10  * regarding copyright ownership.  The ASF licenses this file
11  * to you under the Apache License, Version 2.0 (the
12  * "License"); you may not use this file except in compliance
13  * with the License.  You may obtain a copy of the License at
14  *
15  *   http://www.apache.org/licenses/LICENSE-2.0
16  *
17  * Unless required by applicable law or agreed to in writing,
18  * software distributed under the License is distributed on an
19  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
20  * KIND, either express or implied.  See the License for the
21  * specific language governing permissions and limitations
22  * under the License.
23  * ====================================================================
24  *
25  * This software consists of voluntary contributions made by many
26  * individuals on behalf of the Apache Software Foundation.  For more
27  * information on the Apache Software Foundation, please see
28  * <http://www.apache.org/>.
29  *
30  * For the license checker
31  * Licensed under the Apache License, Version 2.0
32  *
33  */
34 
35 package com.android.tv.tuner.util;
36 
37 /** An expandable byte buffer built on byte array. */
38 public final class ByteArrayBuffer {
39 
40     private byte[] buffer;
41     private int len;
42 
ByteArrayBuffer(int capacity)43     public ByteArrayBuffer(int capacity) {
44         super();
45         if (capacity < 0) {
46             throw new IllegalArgumentException("Buffer capacity may not be negative");
47         }
48         this.buffer = new byte[capacity];
49     }
50 
expand(int newlen)51     private void expand(int newlen) {
52         byte newbuffer[] = new byte[Math.max(this.buffer.length << 1, newlen)];
53         System.arraycopy(this.buffer, 0, newbuffer, 0, this.len);
54         this.buffer = newbuffer;
55     }
56 
append(final byte[] b, int off, int len)57     public void append(final byte[] b, int off, int len) {
58         if (b == null) {
59             return;
60         }
61         if ((off < 0)
62                 || (off > b.length)
63                 || (len < 0)
64                 || ((off + len) < 0)
65                 || ((off + len) > b.length)) {
66             throw new IndexOutOfBoundsException();
67         }
68         if (len == 0) {
69             return;
70         }
71         int newlen = this.len + len;
72         if (newlen > this.buffer.length) {
73             expand(newlen);
74         }
75         System.arraycopy(b, off, this.buffer, this.len, len);
76         this.len = newlen;
77     }
78 
append(int b)79     public void append(int b) {
80         int newlen = this.len + 1;
81         if (newlen > this.buffer.length) {
82             expand(newlen);
83         }
84         this.buffer[this.len] = (byte) b;
85         this.len = newlen;
86     }
87 
append(final char[] b, int off, int len)88     public void append(final char[] b, int off, int len) {
89         if (b == null) {
90             return;
91         }
92         if ((off < 0)
93                 || (off > b.length)
94                 || (len < 0)
95                 || ((off + len) < 0)
96                 || ((off + len) > b.length)) {
97             throw new IndexOutOfBoundsException();
98         }
99         if (len == 0) {
100             return;
101         }
102         int oldlen = this.len;
103         int newlen = oldlen + len;
104         if (newlen > this.buffer.length) {
105             expand(newlen);
106         }
107         for (int i1 = off, i2 = oldlen; i2 < newlen; i1++, i2++) {
108             this.buffer[i2] = (byte) b[i1];
109         }
110         this.len = newlen;
111     }
112 
clear()113     public void clear() {
114         this.len = 0;
115     }
116 
toByteArray()117     public byte[] toByteArray() {
118         byte[] b = new byte[this.len];
119         if (this.len > 0) {
120             System.arraycopy(this.buffer, 0, b, 0, this.len);
121         }
122         return b;
123     }
124 
byteAt(int i)125     public int byteAt(int i) {
126         return this.buffer[i];
127     }
128 
capacity()129     public int capacity() {
130         return this.buffer.length;
131     }
132 
length()133     public int length() {
134         return this.len;
135     }
136 
buffer()137     public byte[] buffer() {
138         return this.buffer;
139     }
140 
setLength(int len)141     public void setLength(int len) {
142         if (len < 0 || len > this.buffer.length) {
143             throw new IndexOutOfBoundsException();
144         }
145         this.len = len;
146     }
147 
isEmpty()148     public boolean isEmpty() {
149         return this.len == 0;
150     }
151 
isFull()152     public boolean isFull() {
153         return this.len == this.buffer.length;
154     }
155 }
156