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annotate src/org/eclipse/jetty/util/StringUtil.java @ 1012:8d0bdd357e6e

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simplify StringUtil
author Franklin Schmidt <fschmidt@gmail.com>
date Mon, 24 Oct 2016 00:47:24 -0600
parents 3242aff51053
children 6939226e0ac4
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rev   line source
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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.UnsupportedEncodingException;
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22 import java.nio.charset.Charset;
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23
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24 import org.slf4j.Logger;
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25 import org.slf4j.LoggerFactory;
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26
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27 /** Fast String Utilities.
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28 *
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29 * These string utilities provide both conveniance methods and
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30 * performance improvements over most standard library versions. The
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31 * main aim of the optimizations is to avoid object creation unless
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32 * absolutely required.
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33 *
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34 *
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35 */
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36 public final class StringUtil
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37 {
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38 private static final Logger LOG = LoggerFactory.getLogger(StringUtil.class);
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39
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40 public static final String ALL_INTERFACES="0.0.0.0";
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41
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42 public static final String __ISO_8859_1="ISO-8859-1";
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43 public final static String __UTF8="UTF-8";
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44 public final static String __UTF16="UTF-16";
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45
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46 public final static Charset __UTF8_CHARSET;
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47 public final static Charset __ISO_8859_1_CHARSET;
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48
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49 static
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50 {
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51 __UTF8_CHARSET=Charset.forName(__UTF8);
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52 __ISO_8859_1_CHARSET=Charset.forName(__ISO_8859_1);
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53 }
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54
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55 private static char[] lowercases = {
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56 '\000','\001','\002','\003','\004','\005','\006','\007',
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57 '\010','\011','\012','\013','\014','\015','\016','\017',
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58 '\020','\021','\022','\023','\024','\025','\026','\027',
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59 '\030','\031','\032','\033','\034','\035','\036','\037',
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60 '\040','\041','\042','\043','\044','\045','\046','\047',
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61 '\050','\051','\052','\053','\054','\055','\056','\057',
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62 '\060','\061','\062','\063','\064','\065','\066','\067',
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63 '\070','\071','\072','\073','\074','\075','\076','\077',
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64 '\100','\141','\142','\143','\144','\145','\146','\147',
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65 '\150','\151','\152','\153','\154','\155','\156','\157',
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66 '\160','\161','\162','\163','\164','\165','\166','\167',
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67 '\170','\171','\172','\133','\134','\135','\136','\137',
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68 '\140','\141','\142','\143','\144','\145','\146','\147',
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69 '\150','\151','\152','\153','\154','\155','\156','\157',
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70 '\160','\161','\162','\163','\164','\165','\166','\167',
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71 '\170','\171','\172','\173','\174','\175','\176','\177' };
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72
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73 /* ------------------------------------------------------------ */
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74 /**
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75 * fast lower case conversion. Only works on ascii (not unicode)
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76 * @param s the string to convert
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77 * @return a lower case version of s
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78 */
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79 public static String asciiToLowerCase(String s)
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80 {
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81 char[] c = null;
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82 int i=s.length();
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83
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84 // look for first conversion
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85 while (i-->0)
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86 {
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87 char c1=s.charAt(i);
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88 if (c1<=127)
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89 {
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90 char c2=lowercases[c1];
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91 if (c1!=c2)
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92 {
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93 c=s.toCharArray();
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94 c[i]=c2;
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95 break;
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96 }
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97 }
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98 }
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99
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100 while (i-->0)
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101 {
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102 if(c[i]<=127)
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103 c[i] = lowercases[c[i]];
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104 }
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105
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106 return c==null?s:new String(c);
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107 }
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108
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109 /* ------------------------------------------------------------ */
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110 /**
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111 * replace substrings within string.
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112 */
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113 public static String replace(String s, String sub, String with)
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114 {
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115 int c=0;
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116 int i=s.indexOf(sub,c);
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117 if (i == -1)
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118 return s;
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119
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120 StringBuilder buf = new StringBuilder(s.length()+with.length());
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121
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122 do
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123 {
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124 buf.append(s.substring(c,i));
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125 buf.append(with);
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126 c=i+sub.length();
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127 } while ((i=s.indexOf(sub,c))!=-1);
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128
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129 if (c<s.length())
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130 buf.append(s.substring(c,s.length()));
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131
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132 return buf.toString();
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133
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134 }
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135
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136
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137 /* ------------------------------------------------------------ */
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138 /**
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139 * append hex digit
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140 *
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141 */
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142 public static void append(StringBuilder buf,byte b,int base)
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143 {
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144 int bi=0xff&b;
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145 int c='0'+(bi/base)%base;
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146 if (c>'9')
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147 c= 'a'+(c-'0'-10);
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148 buf.append((char)c);
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149 c='0'+bi%base;
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150 if (c>'9')
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151 c= 'a'+(c-'0'-10);
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152 buf.append((char)c);
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153 }
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154
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155 public static void append2digits(StringBuilder buf,int i)
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156 {
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157 if (i<100)
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158 {
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159 buf.append((char)(i/10+'0'));
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160 buf.append((char)(i%10+'0'));
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161 }
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162 }
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163
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164 public static String toString(byte[] b,int offset,int length,String charset)
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165 {
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166 try
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167 {
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168 return new String(b,offset,length,charset);
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169 }
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170 catch (UnsupportedEncodingException e)
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171 {
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172 throw new IllegalArgumentException(e);
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173 }
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174 }
802
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175
853
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176 public static boolean isUTF8(String charset)
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177 {
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178 return __UTF8.equalsIgnoreCase(charset)||__UTF8Alt.equalsIgnoreCase(charset);
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179 }
802
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180
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181
853
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182 public static byte[] getBytes(String s)
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183 {
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184 try
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185 {
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186 return s.getBytes(__ISO_8859_1);
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187 }
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188 catch(Exception e)
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189 {
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190 LOG.warn("",e);
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191 return s.getBytes();
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192 }
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193 }
802
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194
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195 }