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annotate src/org/eclipse/jetty/util/ByteArrayISO8859Writer.java @ 951:e542a9cc75ef

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author Franklin Schmidt <fschmidt@gmail.com>
date Wed, 12 Oct 2016 18:12:12 -0600
parents 3428c60d7cfc
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 import java.io.IOException;
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21 import java.io.OutputStream;
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22 import java.io.OutputStreamWriter;
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23 import java.io.Writer;
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24
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25
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26 /* ------------------------------------------------------------ */
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27 /** Byte Array ISO 8859 writer.
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28 * This class combines the features of a OutputStreamWriter for
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29 * ISO8859 encoding with that of a ByteArrayOutputStream. It avoids
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30 * many inefficiencies associated with these standard library classes.
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31 * It has been optimized for standard ASCII characters.
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32 *
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33 *
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34 */
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35 public class ByteArrayISO8859Writer extends Writer
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36 {
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37 private byte[] _buf;
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38 private int _size;
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39 private ByteArrayOutputStream2 _bout=null;
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40 private OutputStreamWriter _writer=null;
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41 private boolean _fixed=false;
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42
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43 /* ------------------------------------------------------------ */
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44 /** Constructor.
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45 */
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46 public ByteArrayISO8859Writer()
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47 {
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48 _buf=new byte[2048];
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49 }
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50
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51 /* ------------------------------------------------------------ */
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52 /** Constructor.
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53 * @param capacity Buffer capacity
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54 */
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55 public ByteArrayISO8859Writer(int capacity)
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56 {
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57 _buf=new byte[capacity];
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58 }
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59
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60 /* ------------------------------------------------------------ */
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61 public ByteArrayISO8859Writer(byte[] buf)
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62 {
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63 _buf=buf;
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64 _fixed=true;
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65 }
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66
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67 /* ------------------------------------------------------------ */
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68 public Object getLock()
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69 {
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70 return lock;
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71 }
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72
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73 /* ------------------------------------------------------------ */
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74 public int size()
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75 {
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76 return _size;
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77 }
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78
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79 /* ------------------------------------------------------------ */
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80 public int capacity()
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81 {
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82 return _buf.length;
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83 }
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84
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85 /* ------------------------------------------------------------ */
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86 public int spareCapacity()
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87 {
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88 return _buf.length-_size;
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89 }
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90
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91 /* ------------------------------------------------------------ */
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92 public void setLength(int l)
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93 {
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94 _size=l;
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95 }
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96
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97 /* ------------------------------------------------------------ */
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98 public byte[] getBuf()
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99 {
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100 return _buf;
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101 }
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102
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103 /* ------------------------------------------------------------ */
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104 public void writeTo(OutputStream out)
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105 throws IOException
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106 {
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107 out.write(_buf,0,_size);
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108 }
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109
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110 /* ------------------------------------------------------------ */
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111 public void write(char c)
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112 throws IOException
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113 {
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114 ensureSpareCapacity(1);
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115 if (c>=0&&c<=0x7f)
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116 _buf[_size++]=(byte)c;
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117 else
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118 {
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119 char[] ca ={c};
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120 writeEncoded(ca,0,1);
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121 }
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122 }
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123
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124 /* ------------------------------------------------------------ */
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125 @Override
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126 public void write(char[] ca)
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127 throws IOException
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128 {
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129 ensureSpareCapacity(ca.length);
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130 for (int i=0;i<ca.length;i++)
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131 {
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132 char c=ca[i];
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133 if (c>=0&&c<=0x7f)
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134 _buf[_size++]=(byte)c;
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135 else
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136 {
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137 writeEncoded(ca,i,ca.length-i);
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138 break;
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139 }
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140 }
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141 }
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142
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143 /* ------------------------------------------------------------ */
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144 @Override
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145 public void write(char[] ca,int offset, int length)
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146 throws IOException
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147 {
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148 ensureSpareCapacity(length);
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149 for (int i=0;i<length;i++)
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150 {
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151 char c=ca[offset+i];
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152 if (c>=0&&c<=0x7f)
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153 _buf[_size++]=(byte)c;
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154 else
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155 {
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156 writeEncoded(ca,offset+i,length-i);
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157 break;
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158 }
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159 }
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160 }
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161
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162 /* ------------------------------------------------------------ */
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163 @Override
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164 public void write(String s)
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165 throws IOException
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166 {
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167 if (s==null)
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168 {
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169 write("null",0,4);
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170 return;
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171 }
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172
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173 int length=s.length();
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174 ensureSpareCapacity(length);
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175 for (int i=0;i<length;i++)
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176 {
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177 char c=s.charAt(i);
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178 if (c>=0x0&&c<=0x7f)
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179 _buf[_size++]=(byte)c;
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180 else
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181 {
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182 writeEncoded(s.toCharArray(),i,length-i);
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183 break;
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184 }
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185 }
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186 }
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187
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188 /* ------------------------------------------------------------ */
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189 @Override
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190 public void write(String s,int offset, int length)
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191 throws IOException
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192 {
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193 ensureSpareCapacity(length);
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194 for (int i=0;i<length;i++)
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195 {
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196 char c=s.charAt(offset+i);
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197 if (c>=0&&c<=0x7f)
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198 _buf[_size++]=(byte)c;
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199 else
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200 {
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201 writeEncoded(s.toCharArray(),offset+i,length-i);
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202 break;
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203 }
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204 }
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205 }
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206
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207 /* ------------------------------------------------------------ */
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208 private void writeEncoded(char[] ca,int offset, int length)
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209 throws IOException
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210 {
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211 if (_bout==null)
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212 {
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213 _bout = new ByteArrayOutputStream2(2*length);
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214 _writer = new OutputStreamWriter(_bout,StringUtil.__ISO_8859_1);
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215 }
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216 else
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217 _bout.reset();
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218 _writer.write(ca,offset,length);
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219 _writer.flush();
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220 ensureSpareCapacity(_bout.getCount());
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221 System.arraycopy(_bout.getBuf(),0,_buf,_size,_bout.getCount());
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222 _size+=_bout.getCount();
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223 }
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224
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225 /* ------------------------------------------------------------ */
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226 @Override
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227 public void flush()
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228 {}
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229
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230 /* ------------------------------------------------------------ */
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231 public void resetWriter()
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232 {
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233 _size=0;
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234 }
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235
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236 /* ------------------------------------------------------------ */
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237 @Override
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238 public void close()
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239 {}
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240
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241 /* ------------------------------------------------------------ */
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242 public void destroy()
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243 {
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244 _buf=null;
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245 }
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246
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247 /* ------------------------------------------------------------ */
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248 public void ensureSpareCapacity(int n)
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249 throws IOException
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250 {
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251 if (_size+n>_buf.length)
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252 {
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253 if (_fixed)
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254 throw new IOException("Buffer overflow: "+_buf.length);
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255 byte[] buf = new byte[(_buf.length+n)*4/3];
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256 System.arraycopy(_buf,0,buf,0,_size);
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257 _buf=buf;
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258 }
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259 }
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260
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261
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262 /* ------------------------------------------------------------ */
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263 public byte[] getByteArray()
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264 {
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265 byte[] data=new byte[_size];
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266 System.arraycopy(_buf,0,data,0,_size);
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267 return data;
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268 }
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269
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270 }
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271
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272