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 */
31
32package com.android.tv.tuner.util;
33
34/**
35 * An expandable byte buffer built on byte array.
36 */
37public final class ByteArrayBuffer {
38
39    private byte[] buffer;
40    private int len;
41
42    public ByteArrayBuffer(int capacity) {
43        super();
44        if (capacity < 0) {
45            throw new IllegalArgumentException("Buffer capacity may not be negative");
46        }
47        this.buffer = new byte[capacity];
48    }
49
50    private void expand(int newlen) {
51        byte newbuffer[] = new byte[Math.max(this.buffer.length << 1, newlen)];
52        System.arraycopy(this.buffer, 0, newbuffer, 0, this.len);
53        this.buffer = newbuffer;
54    }
55
56    public void append(final byte[] b, int off, int len) {
57        if (b == null) {
58            return;
59        }
60        if ((off < 0) || (off > b.length) || (len < 0) ||
61                ((off + len) < 0) || ((off + len) > b.length)) {
62            throw new IndexOutOfBoundsException();
63        }
64        if (len == 0) {
65            return;
66        }
67        int newlen = this.len + len;
68        if (newlen > this.buffer.length) {
69            expand(newlen);
70        }
71        System.arraycopy(b, off, this.buffer, this.len, len);
72        this.len = newlen;
73    }
74
75    public void append(int b) {
76        int newlen = this.len + 1;
77        if (newlen > this.buffer.length) {
78            expand(newlen);
79        }
80        this.buffer[this.len] = (byte) b;
81        this.len = newlen;
82    }
83
84    public void append(final char[] b, int off, int len) {
85        if (b == null) {
86            return;
87        }
88        if ((off < 0) || (off > b.length) || (len < 0) ||
89                ((off + len) < 0) || ((off + len) > b.length)) {
90            throw new IndexOutOfBoundsException();
91        }
92        if (len == 0) {
93            return;
94        }
95        int oldlen = this.len;
96        int newlen = oldlen + len;
97        if (newlen > this.buffer.length) {
98            expand(newlen);
99        }
100        for (int i1 = off, i2 = oldlen; i2 < newlen; i1++, i2++) {
101            this.buffer[i2] = (byte) b[i1];
102        }
103        this.len = newlen;
104    }
105
106    public void clear() {
107        this.len = 0;
108    }
109
110    public byte[] toByteArray() {
111        byte[] b = new byte[this.len];
112        if (this.len > 0) {
113            System.arraycopy(this.buffer, 0, b, 0, this.len);
114        }
115        return b;
116    }
117
118    public int byteAt(int i) {
119        return this.buffer[i];
120    }
121
122    public int capacity() {
123        return this.buffer.length;
124    }
125
126    public int length() {
127        return this.len;
128    }
129
130    public byte[] buffer() {
131        return this.buffer;
132    }
133
134    public void setLength(int len) {
135        if (len < 0 || len > this.buffer.length) {
136            throw new IndexOutOfBoundsException();
137        }
138        this.len = len;
139    }
140
141    public boolean isEmpty() {
142        return this.len == 0;
143    }
144
145    public boolean isFull() {
146        return this.len == this.buffer.length;
147    }
148
149}
150