annotate src/org/eclipse/jetty/io/BufferUtil.java @ 1039:a7319f14ba1e

remove Buffer.isImmutable()
author Franklin Schmidt <fschmidt@gmail.com>
date Thu, 03 Nov 2016 22:55:28 -0600
parents e350c11242be
children a8c92b0a08ed
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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.io;
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20
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21
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22 /* ------------------------------------------------------------------------------- */
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23 /** Buffer utility methods.
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24 *
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25 *
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26 */
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27 public final class BufferUtil
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28 {
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29 static final byte SPACE= 0x20;
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30 static final byte MINUS= '-';
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31 static final byte[] DIGIT=
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32 {(byte)'0',(byte)'1',(byte)'2',(byte)'3',(byte)'4',(byte)'5',(byte)'6',(byte)'7',(byte)'8',(byte)'9',(byte)'A',(byte)'B',(byte)'C',(byte)'D',(byte)'E',(byte)'F'};
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33
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34 /**
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35 * Convert buffer to an integer.
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36 * Parses up to the first non-numeric character. If no number is found an
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37 * IllegalArgumentException is thrown
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38 * @param buffer A buffer containing an integer. The position is not changed.
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39 * @return an int
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40 */
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41 public static int toInt(Buffer buffer)
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42 {
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43 int val= 0;
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44 boolean started= false;
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45 boolean minus= false;
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46 for (int i= buffer.getIndex(); i < buffer.putIndex(); i++)
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47 {
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48 byte b= buffer.peek(i);
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49 if (b <= SPACE)
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50 {
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51 if (started)
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52 break;
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53 }
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54 else if (b >= '0' && b <= '9')
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55 {
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56 val= val * 10 + (b - '0');
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57 started= true;
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58 }
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59 else if (b == MINUS && !started)
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60 {
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61 minus= true;
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62 }
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63 else
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64 break;
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65 }
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66
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67 if (started)
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68 return minus ? (-val) : val;
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69 throw new NumberFormatException(buffer.toString());
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70 }
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71
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72 /**
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73 * Convert string to an long.
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74 * Parses up to the first non-numeric character. If no number is found an
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75 * IllegalArgumentException is thrown
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76 */
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77 public static long toLong(String s)
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78 {
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79 long val = 0;
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80 boolean started= false;
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81 boolean minus= false;
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82 for (int i = 0; i < s.length(); i++)
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83 {
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84 char c = s.charAt(i);
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85 if (c <= ' ')
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86 {
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87 if (started)
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88 break;
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89 }
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90 else if (c >= '0' && c <= '9')
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91 {
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92 val= val * 10L + (c - '0');
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93 started= true;
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94 }
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95 else if (c == '-' && !started)
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96 {
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97 minus= true;
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98 }
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99 else
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100 break;
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101 }
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102
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103 if (started)
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104 return minus ? (-val) : val;
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105 throw new NumberFormatException(s);
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106 }
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107
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108 public static void putHexInt(Buffer buffer, int n)
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109 {
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110
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111 if (n < 0)
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112 {
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113 buffer.put((byte)'-');
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114
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115 if (n == Integer.MIN_VALUE)
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116 {
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117 buffer.put((byte)(0x7f&'8'));
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118 buffer.put((byte)(0x7f&'0'));
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119 buffer.put((byte)(0x7f&'0'));
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120 buffer.put((byte)(0x7f&'0'));
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121 buffer.put((byte)(0x7f&'0'));
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122 buffer.put((byte)(0x7f&'0'));
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123 buffer.put((byte)(0x7f&'0'));
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124 buffer.put((byte)(0x7f&'0'));
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125
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126 return;
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127 }
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128 n= -n;
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129 }
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130
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131 if (n < 0x10)
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132 {
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133 buffer.put(DIGIT[n]);
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134 }
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135 else
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136 {
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137 boolean started= false;
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138 // This assumes constant time int arithmatic
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139 for (int i= 0; i < hexDivisors.length; i++)
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140 {
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141 if (n < hexDivisors[i])
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142 {
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143 if (started)
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144 buffer.put((byte)'0');
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145 continue;
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146 }
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147
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148 started= true;
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149 int d= n / hexDivisors[i];
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150 buffer.put(DIGIT[d]);
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151 n= n - d * hexDivisors[i];
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152 }
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153 }
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154 }
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155
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156 /* ------------------------------------------------------------ */
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157 /**
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158 * Add hex integer BEFORE current getIndex.
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159 * @param buffer
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160 * @param n
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161 */
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162 public static void prependHexInt(Buffer buffer, int n)
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163 {
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164 if (n==0)
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165 {
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166 int gi=buffer.getIndex();
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167 buffer.poke(--gi,(byte)'0');
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168 buffer.setGetIndex(gi);
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169 }
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170 else
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171 {
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172 boolean minus=false;
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173 if (n<0)
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174 {
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175 minus=true;
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176 n=-n;
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177 }
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178
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179 int gi=buffer.getIndex();
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180 while(n>0)
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181 {
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182 int d = 0xf&n;
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183 n=n>>4;
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184 buffer.poke(--gi,DIGIT[d]);
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185 }
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186
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187 if (minus)
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188 buffer.poke(--gi,(byte)'-');
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189 buffer.setGetIndex(gi);
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190 }
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191 }
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192
802
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193
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194 public static void putDecLong(Buffer buffer, long n)
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195 {
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196 if (n < 0)
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197 {
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198 buffer.put((byte)'-');
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199
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200 if (n == Long.MIN_VALUE)
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201 {
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202 buffer.put((byte)'9');
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203 n= 223372036854775808L;
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204 }
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205 else
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206 n= -n;
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207 }
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208
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209 if (n < 10)
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210 {
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211 buffer.put(DIGIT[(int)n]);
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212 }
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213 else
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214 {
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215 boolean started= false;
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216 // This assumes constant time int arithmatic
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217 for (int i= 0; i < decDivisorsL.length; i++)
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218 {
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219 if (n < decDivisorsL[i])
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220 {
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221 if (started)
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222 buffer.put((byte)'0');
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223 continue;
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224 }
802
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225
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226 started= true;
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227 long d= n / decDivisorsL[i];
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228 buffer.put(DIGIT[(int)d]);
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229 n= n - d * decDivisorsL[i];
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230 }
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231 }
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232 }
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233
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234 private final static int[] hexDivisors=
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235 {
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236 0x10000000,
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237 0x1000000,
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238 0x100000,
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239 0x10000,
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240 0x1000,
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241 0x100,
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242 0x10,
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243 0x1
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244 };
802
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245
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246 private final static long[] decDivisorsL=
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247 {
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248 1000000000000000000L,
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249 100000000000000000L,
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250 10000000000000000L,
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251 1000000000000000L,
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252 100000000000000L,
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253 10000000000000L,
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254 1000000000000L,
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255 100000000000L,
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256 10000000000L,
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257 1000000000L,
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258 100000000L,
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259 10000000L,
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260 1000000L,
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261 100000L,
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262 10000L,
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263 1000L,
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264 100L,
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265 10L,
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266 1L
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267 };
802
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268
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269
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270 public static void putCRLF(Buffer buffer)
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271 {
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272 buffer.put((byte)13);
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273 buffer.put((byte)10);
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274 }
1021
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275
802
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276 }