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annotate src/org/eclipse/jetty/util/Utf8Appendable.java @ 955:6f49b8dfffe6

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simplify SelectChannelEndPoint
author Franklin Schmidt <fschmidt@gmail.com>
date Thu, 13 Oct 2016 16:55:53 -0600
parents 8e9db0bbf4f9
children
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1 //
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2 // ========================================================================
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3 // Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd.
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4 // ------------------------------------------------------------------------
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5 // All rights reserved. This program and the accompanying materials
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6 // are made available under the terms of the Eclipse Public License v1.0
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7 // and Apache License v2.0 which accompanies this distribution.
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8 //
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9 // The Eclipse Public License is available at
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10 // http://www.eclipse.org/legal/epl-v10.html
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11 //
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12 // The Apache License v2.0 is available at
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13 // http://www.opensource.org/licenses/apache2.0.php
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14 //
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15 // You may elect to redistribute this code under either of these licenses.
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16 // ========================================================================
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17 //
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18
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19 package org.eclipse.jetty.util;
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20
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21 import java.io.IOException;
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22
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23 import org.slf4j.Logger;
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24 import org.slf4j.LoggerFactory;
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25
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26 /* ------------------------------------------------------------ */
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27 /**
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28 * Utf8 Appendable abstract base class
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29 *
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30 * This abstract class wraps a standard {@link java.lang.Appendable} and provides methods to append UTF-8 encoded bytes, that are converted into characters.
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31 *
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32 * This class is stateful and up to 4 calls to {@link #append(byte)} may be needed before state a character is appended to the string buffer.
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33 *
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34 * The UTF-8 decoding is done by this class and no additional buffers or Readers are used. The UTF-8 code was inspired by
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35 * http://bjoern.hoehrmann.de/utf-8/decoder/dfa/
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36 *
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37 * License information for Bjoern Hoehrmann's code:
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38 *
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39 * Copyright (c) 2008-2009 Bjoern Hoehrmann <bjoern@hoehrmann.de>
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40 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal
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41 * in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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42 * copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
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43 *
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44 * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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45 *
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46 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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47 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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48 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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49 **/
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50 public abstract class Utf8Appendable
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51 {
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52 protected static final Logger LOG = LoggerFactory.getLogger(Utf8Appendable.class);
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53 public static final char REPLACEMENT = '\ufffd';
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54 private static final int UTF8_ACCEPT = 0;
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55 private static final int UTF8_REJECT = 12;
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56
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57 protected final Appendable _appendable;
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58 protected int _state = UTF8_ACCEPT;
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59
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60 private static final byte[] BYTE_TABLE =
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61 {
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62 // The first part of the table maps bytes to character classes that
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63 // to reduce the size of the transition table and create bitmasks.
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64 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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65 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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66 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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67 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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68 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,
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69 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
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70 8,8,2,2,2,2,2,2,2,2,2,2,2,2,2,2, 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
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71 10,3,3,3,3,3,3,3,3,3,3,3,3,4,3,3, 11,6,6,6,5,8,8,8,8,8,8,8,8,8,8,8
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72 };
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73
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74 private static final byte[] TRANS_TABLE =
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75 {
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76 // The second part is a transition table that maps a combination
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77 // of a state of the automaton and a character class to a state.
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78 0,12,24,36,60,96,84,12,12,12,48,72, 12,12,12,12,12,12,12,12,12,12,12,12,
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79 12, 0,12,12,12,12,12, 0,12, 0,12,12, 12,24,12,12,12,12,12,24,12,24,12,12,
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80 12,12,12,12,12,12,12,24,12,12,12,12, 12,24,12,12,12,12,12,12,12,24,12,12,
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81 12,12,12,12,12,12,12,36,12,36,12,12, 12,36,12,12,12,12,12,36,12,36,12,12,
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82 12,36,12,12,12,12,12,12,12,12,12,12
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83 };
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84
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85 private int _codep;
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86
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87 public Utf8Appendable(Appendable appendable)
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88 {
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89 _appendable = appendable;
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90 }
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91
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92 public abstract int length();
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93
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94 protected void reset()
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95 {
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96 _state = UTF8_ACCEPT;
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97 }
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98
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99 public void append(byte b)
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100 {
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101 try
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102 {
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103 appendByte(b);
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104 }
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105 catch (IOException e)
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106 {
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107 throw new RuntimeException(e);
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108 }
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109 }
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110
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111 public void append(byte[] b, int offset, int length)
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112 {
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113 try
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114 {
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115 int end = offset + length;
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116 for (int i = offset; i < end; i++)
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117 appendByte(b[i]);
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118 }
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119 catch (IOException e)
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120 {
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121 throw new RuntimeException(e);
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122 }
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123 }
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124
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125 public boolean append(byte[] b, int offset, int length, int maxChars)
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126 {
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127 try
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128 {
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129 int end = offset + length;
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130 for (int i = offset; i < end; i++)
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131 {
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132 if (length() > maxChars)
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133 return false;
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134 appendByte(b[i]);
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135 }
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136 return true;
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137 }
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138 catch (IOException e)
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139 {
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140 throw new RuntimeException(e);
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141 }
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142 }
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143
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144 protected void appendByte(byte b) throws IOException
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145 {
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146
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147 if (b > 0 && _state == UTF8_ACCEPT)
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148 {
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149 _appendable.append((char)(b & 0xFF));
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150 }
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151 else
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152 {
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153 int i = b & 0xFF;
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154 int type = BYTE_TABLE[i];
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155 _codep = _state == UTF8_ACCEPT ? (0xFF >> type) & i : (i & 0x3F) | (_codep << 6);
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156 int next = TRANS_TABLE[_state + type];
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157
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158 switch(next)
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159 {
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160 case UTF8_ACCEPT:
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161 _state=next;
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162 if (_codep < Character.MIN_HIGH_SURROGATE)
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163 {
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164 _appendable.append((char)_codep);
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165 }
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166 else
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167 {
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168 for (char c : Character.toChars(_codep))
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169 _appendable.append(c);
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170 }
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171 break;
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172
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173 case UTF8_REJECT:
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174 String reason = "byte "+TypeUtil.toHexString(b)+" in state "+(_state/12);
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175 _codep=0;
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176 _state = UTF8_ACCEPT;
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177 _appendable.append(REPLACEMENT);
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178 throw new NotUtf8Exception(reason);
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179
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180 default:
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181 _state=next;
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182
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183 }
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184 }
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185 }
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186
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187 public boolean isUtf8SequenceComplete()
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188 {
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189 return _state == UTF8_ACCEPT;
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190 }
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191
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192 public static class NotUtf8Exception extends IllegalArgumentException
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193 {
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194 public NotUtf8Exception(String reason)
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195 {
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196 super("Not valid UTF8! "+reason);
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197 }
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198 }
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199
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200 protected void checkState()
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201 {
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202 if (!isUtf8SequenceComplete())
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203 {
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204 _codep=0;
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205 _state = UTF8_ACCEPT;
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206 try
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207 {
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208 _appendable.append(REPLACEMENT);
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209 }
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210 catch(IOException e)
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211 {
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212 throw new RuntimeException(e);
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213 }
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214 throw new NotUtf8Exception("incomplete UTF8 sequence");
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215 }
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216 }
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217
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218 public String toReplacedString()
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219 {
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220 if (!isUtf8SequenceComplete())
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221 {
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222 _codep=0;
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223 _state = UTF8_ACCEPT;
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224 try
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225 {
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226 _appendable.append(REPLACEMENT);
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227 }
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228 catch(IOException e)
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229 {
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230 throw new RuntimeException(e);
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231 }
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232 Throwable th= new NotUtf8Exception("incomplete UTF8 sequence");
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233 LOG.warn(th.toString());
820
8e9db0bbf4f9 remove org.eclipse.jetty.util.log and upgrade slf4j
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234 LOG.debug("",th);
802
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235 }
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236 return _appendable.toString();
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237 }
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238 }