annotate src/org/eclipse/jetty/io/BufferUtil.java @ 1052:4a2489f1d5fe

remove JBuffer.peek()
author Franklin Schmidt <fschmidt@gmail.com>
date Tue, 08 Nov 2016 00:27:16 -0700
parents 2b769da7f67d
children 87275900646e
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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 import java.nio.ByteBuffer;
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22 import org.eclipse.jetty.util.StringUtil;
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23
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24
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25 /* ------------------------------------------------------------------------------- */
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26 /** Buffer utility methods.
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27 *
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28 *
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29 */
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30 public final class BufferUtil
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31 {
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32 static final byte SPACE= 0x20;
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33 static final byte MINUS= '-';
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34 static final byte[] DIGIT=
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35 {(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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36
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37 /**
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38 * Convert buffer to an integer.
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39 * Parses up to the first non-numeric character. If no number is found an
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40 * IllegalArgumentException is thrown
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41 * @param buffer A buffer containing an integer. The position is not changed.
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42 * @return an int
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43 */
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44 public static int toInt(JBuffer buffer)
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45 {
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46 int val= 0;
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47 boolean started= false;
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48 boolean minus= false;
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49 for (int i= buffer.getIndex(); i < buffer.putIndex(); i++)
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50 {
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51 byte b = buffer.get(i);
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52 if (b <= SPACE)
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53 {
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54 if (started)
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55 break;
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56 }
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57 else if (b >= '0' && b <= '9')
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58 {
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59 val= val * 10 + (b - '0');
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60 started= true;
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61 }
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62 else if (b == MINUS && !started)
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63 {
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64 minus= true;
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65 }
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66 else
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67 break;
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68 }
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69
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70 if (started)
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71 return minus ? (-val) : val;
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72 throw new NumberFormatException(buffer.toString());
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73 }
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74
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75 /**
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76 * Convert string to an long.
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77 * Parses up to the first non-numeric character. If no number is found an
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78 * IllegalArgumentException is thrown
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79 */
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80 public static long toLong(String s)
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81 {
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82 long val = 0;
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83 boolean started= false;
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84 boolean minus= false;
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85 for (int i = 0; i < s.length(); i++)
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86 {
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87 char c = s.charAt(i);
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88 if (c <= ' ')
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89 {
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90 if (started)
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91 break;
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92 }
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93 else if (c >= '0' && c <= '9')
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94 {
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95 val= val * 10L + (c - '0');
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96 started= true;
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97 }
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98 else if (c == '-' && !started)
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99 {
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100 minus= true;
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101 }
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102 else
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103 break;
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104 }
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105
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106 if (started)
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107 return minus ? (-val) : val;
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108 throw new NumberFormatException(s);
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109 }
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110
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111 public static void putHexInt(JBuffer buffer, int n)
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112 {
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113
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114 if (n < 0)
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115 {
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116 buffer.put((byte)'-');
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117
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118 if (n == Integer.MIN_VALUE)
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119 {
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120 buffer.put((byte)(0x7f&'8'));
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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 buffer.put((byte)(0x7f&'0'));
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126 buffer.put((byte)(0x7f&'0'));
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127 buffer.put((byte)(0x7f&'0'));
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128
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129 return;
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130 }
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131 n= -n;
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132 }
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133
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134 if (n < 0x10)
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135 {
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136 buffer.put(DIGIT[n]);
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137 }
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138 else
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139 {
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140 boolean started= false;
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141 // This assumes constant time int arithmatic
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142 for (int i= 0; i < hexDivisors.length; i++)
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143 {
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144 if (n < hexDivisors[i])
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145 {
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146 if (started)
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147 buffer.put((byte)'0');
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148 continue;
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149 }
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150
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151 started= true;
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152 int d= n / hexDivisors[i];
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153 buffer.put(DIGIT[d]);
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154 n= n - d * hexDivisors[i];
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155 }
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156 }
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157 }
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158
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159 /* ------------------------------------------------------------ */
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160 /**
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161 * Add hex integer BEFORE current getIndex.
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162 * @param buffer
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163 * @param n
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164 */
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165 public static void prependHexInt(JBuffer buffer, int n)
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166 {
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167 if (n==0)
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168 {
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169 int gi=buffer.getIndex();
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170 buffer.poke(--gi,(byte)'0');
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171 buffer.setGetIndex(gi);
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172 }
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173 else
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174 {
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175 boolean minus=false;
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176 if (n<0)
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177 {
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178 minus=true;
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179 n=-n;
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180 }
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181
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182 int gi=buffer.getIndex();
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183 while(n>0)
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184 {
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185 int d = 0xf&n;
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186 n=n>>4;
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187 buffer.poke(--gi,DIGIT[d]);
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188 }
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189
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190 if (minus)
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191 buffer.poke(--gi,(byte)'-');
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192 buffer.setGetIndex(gi);
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193 }
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194 }
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195
802
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196
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197 public static void putDecLong(JBuffer buffer, long n)
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198 {
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199 if (n < 0)
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200 {
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201 buffer.put((byte)'-');
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202
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203 if (n == Long.MIN_VALUE)
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204 {
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205 buffer.put((byte)'9');
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206 n= 223372036854775808L;
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207 }
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208 else
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209 n= -n;
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210 }
802
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211
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212 if (n < 10)
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213 {
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214 buffer.put(DIGIT[(int)n]);
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215 }
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216 else
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217 {
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218 boolean started= false;
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219 // This assumes constant time int arithmatic
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220 for (int i= 0; i < decDivisorsL.length; i++)
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221 {
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222 if (n < decDivisorsL[i])
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223 {
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224 if (started)
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225 buffer.put((byte)'0');
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226 continue;
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227 }
802
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228
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229 started= true;
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230 long d= n / decDivisorsL[i];
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231 buffer.put(DIGIT[(int)d]);
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232 n= n - d * decDivisorsL[i];
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233 }
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234 }
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235 }
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236
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237 private final static int[] hexDivisors=
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238 {
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239 0x10000000,
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240 0x1000000,
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241 0x100000,
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242 0x10000,
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243 0x1000,
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244 0x100,
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245 0x10,
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246 0x1
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247 };
802
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248
1018
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249 private final static long[] decDivisorsL=
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250 {
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251 1000000000000000000L,
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diff changeset
252 100000000000000000L,
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diff changeset
253 10000000000000000L,
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diff changeset
254 1000000000000000L,
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diff changeset
255 100000000000000L,
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diff changeset
256 10000000000000L,
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diff changeset
257 1000000000000L,
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diff changeset
258 100000000000L,
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diff changeset
259 10000000000L,
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diff changeset
260 1000000000L,
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diff changeset
261 100000000L,
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diff changeset
262 10000000L,
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diff changeset
263 1000000L,
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diff changeset
264 100000L,
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diff changeset
265 10000L,
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266 1000L,
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diff changeset
267 100L,
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268 10L,
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269 1L
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270 };
802
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271
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272
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273 public static void putCRLF(JBuffer buffer)
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274 {
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275 buffer.put((byte)13);
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276 buffer.put((byte)10);
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277 }
1021
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diff changeset
278
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279
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280 public static final JBuffer EMPTY_BUFFER = new JBuffer(ByteBuffer.allocate(0));
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281
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282 public static JBuffer wrap(byte[] array,int offset,int length) {
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283 return new JBuffer(ByteBuffer.wrap(array,offset,length));
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284 }
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285
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286 public static JBuffer wrap(byte[] array) {
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287 return new JBuffer(ByteBuffer.wrap(array));
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288 }
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289
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290 public static JBuffer wrap(String s) {
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291 byte[] bytes = StringUtil.getBytes(s);
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292 ByteBuffer bb = ByteBuffer.wrap(bytes).asReadOnlyBuffer();
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293 return new JBuffer(bb);
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294 }
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295
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diff changeset
296 public static JBuffer newBuffer(int size) {
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297 ByteBuffer bb = ByteBuffer.allocate(size);
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298 bb.limit(0);
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299 return new JBuffer(bb);
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300 }
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diff changeset
301
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diff changeset
302 public static JBuffer newDirectBuffer(int size) {
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diff changeset
303 ByteBuffer bb = ByteBuffer.allocateDirect(size);
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304 bb.limit(0);
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diff changeset
305 return new JBuffer(bb);
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diff changeset
306 }
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diff changeset
307
802
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diff changeset
308 }