1 | /**************************************************************** |
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2 | * Licensed to the Apache Software Foundation (ASF) under one * |
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3 | * or more contributor license agreements. See the NOTICE file * |
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4 | * distributed with this work for additional information * |
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5 | * regarding copyright ownership. The ASF licenses this file * |
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6 | * to you under the Apache License, Version 2.0 (the * |
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7 | * "License"); you may not use this file except in compliance * |
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8 | * with the License. You may obtain a copy of the License at * |
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9 | * * |
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10 | * http://www.apache.org/licenses/LICENSE-2.0 * |
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11 | * * |
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12 | * Unless required by applicable law or agreed to in writing, * |
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13 | * software distributed under the License is distributed on an * |
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14 | * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * |
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15 | * KIND, either express or implied. See the License for the * |
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16 | * specific language governing permissions and limitations * |
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17 | * under the License. * |
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18 | ****************************************************************/ |
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19 | |
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20 | package org.apache.james.mime4j.util; |
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21 | |
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22 | |
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23 | /** |
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24 | * A resizable byte array. |
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25 | */ |
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26 | public final class ByteArrayBuffer implements ByteSequence { |
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27 | |
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28 | private byte[] buffer; |
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29 | private int len; |
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30 | |
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31 | public ByteArrayBuffer(int capacity) { |
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32 | super(); |
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33 | if (capacity < 0) { |
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34 | throw new IllegalArgumentException("Buffer capacity may not be negative"); |
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35 | } |
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36 | this.buffer = new byte[capacity]; |
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37 | } |
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38 | |
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39 | public ByteArrayBuffer(byte[] bytes, boolean dontCopy) { |
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40 | this(bytes, bytes.length, dontCopy); |
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41 | } |
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42 | |
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43 | public ByteArrayBuffer(byte[] bytes, int len, boolean dontCopy) { |
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44 | if (bytes == null) |
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45 | throw new IllegalArgumentException(); |
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46 | if (len < 0 || len > bytes.length) |
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47 | throw new IllegalArgumentException(); |
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48 | |
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49 | if (dontCopy) { |
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50 | this.buffer = bytes; |
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51 | } else { |
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52 | this.buffer = new byte[len]; |
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53 | System.arraycopy(bytes, 0, this.buffer, 0, len); |
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54 | } |
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55 | |
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56 | this.len = len; |
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57 | } |
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58 | |
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59 | private void expand(int newlen) { |
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60 | byte newbuffer[] = new byte[Math.max(this.buffer.length << 1, newlen)]; |
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61 | System.arraycopy(this.buffer, 0, newbuffer, 0, this.len); |
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62 | this.buffer = newbuffer; |
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63 | } |
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64 | |
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65 | public void append(final byte[] b, int off, int len) { |
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66 | if (b == null) { |
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67 | return; |
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68 | } |
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69 | if ((off < 0) || (off > b.length) || (len < 0) || |
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70 | ((off + len) < 0) || ((off + len) > b.length)) { |
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71 | throw new IndexOutOfBoundsException(); |
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72 | } |
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73 | if (len == 0) { |
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74 | return; |
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75 | } |
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76 | int newlen = this.len + len; |
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77 | if (newlen > this.buffer.length) { |
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78 | expand(newlen); |
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79 | } |
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80 | System.arraycopy(b, off, this.buffer, this.len, len); |
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81 | this.len = newlen; |
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82 | } |
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83 | |
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84 | public void append(int b) { |
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85 | int newlen = this.len + 1; |
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86 | if (newlen > this.buffer.length) { |
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87 | expand(newlen); |
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88 | } |
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89 | this.buffer[this.len] = (byte)b; |
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90 | this.len = newlen; |
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91 | } |
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92 | |
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93 | public void clear() { |
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94 | this.len = 0; |
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95 | } |
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96 | |
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97 | public byte[] toByteArray() { |
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98 | byte[] b = new byte[this.len]; |
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99 | if (this.len > 0) { |
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100 | System.arraycopy(this.buffer, 0, b, 0, this.len); |
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101 | } |
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102 | return b; |
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103 | } |
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104 | |
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105 | public byte byteAt(int i) { |
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106 | if (i < 0 || i >= this.len) |
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107 | throw new IndexOutOfBoundsException(); |
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108 | |
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109 | return this.buffer[i]; |
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110 | } |
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111 | |
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112 | public int capacity() { |
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113 | return this.buffer.length; |
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114 | } |
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115 | |
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116 | public int length() { |
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117 | return this.len; |
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118 | } |
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119 | |
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120 | public byte[] buffer() { |
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121 | return this.buffer; |
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122 | } |
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123 | |
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124 | public int indexOf(byte b) { |
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125 | return indexOf(b, 0, this.len); |
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126 | } |
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127 | |
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128 | public int indexOf(byte b, int beginIndex, int endIndex) { |
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129 | if (beginIndex < 0) { |
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130 | beginIndex = 0; |
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131 | } |
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132 | if (endIndex > this.len) { |
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133 | endIndex = this.len; |
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134 | } |
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135 | if (beginIndex > endIndex) { |
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136 | return -1; |
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137 | } |
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138 | for (int i = beginIndex; i < endIndex; i++) { |
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139 | if (this.buffer[i] == b) { |
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140 | return i; |
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141 | } |
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142 | } |
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143 | return -1; |
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144 | } |
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145 | |
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146 | public void setLength(int len) { |
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147 | if (len < 0 || len > this.buffer.length) { |
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148 | throw new IndexOutOfBoundsException(); |
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149 | } |
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150 | this.len = len; |
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151 | } |
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152 | |
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153 | public void remove(int off, int len) { |
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154 | if ((off < 0) || (off > this.len) || (len < 0) || |
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155 | ((off + len) < 0) || ((off + len) > this.len)) { |
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156 | throw new IndexOutOfBoundsException(); |
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157 | } |
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158 | if (len == 0) { |
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159 | return; |
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160 | } |
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161 | int remaining = this.len - off - len; |
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162 | if (remaining > 0) { |
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163 | System.arraycopy(this.buffer, off + len, this.buffer, off, remaining); |
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164 | } |
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165 | this.len -= len; |
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166 | } |
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167 | |
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168 | public boolean isEmpty() { |
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169 | return this.len == 0; |
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170 | } |
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171 | |
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172 | public boolean isFull() { |
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173 | return this.len == this.buffer.length; |
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174 | } |
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175 | |
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176 | @Override |
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177 | public String toString() { |
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178 | return new String(toByteArray()); |
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179 | } |
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180 | |
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181 | } |
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