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 32 package com.android.tv.tuner.util; 33 34 /** 35 * An expandable byte buffer built on byte array. 36 */ 37 public 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
