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annotate src/org/eclipse/jetty/io/BufferUtil.java @ 1036:b87f97f6418a
minor
| author | Franklin Schmidt <fschmidt@gmail.com> |
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| date | Thu, 03 Nov 2016 21:42:41 -0600 |
| parents | e350c11242be |
| children | a8c92b0a08ed |
| 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 */ |
| 1018 | 27 public final class BufferUtil |
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28 { |
| 1018 | 29 static final byte SPACE= 0x20; |
| 30 static final byte MINUS= '-'; | |
| 31 static final byte[] DIGIT= | |
| 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 |
| 1018 | 34 /** |
| 35 * Convert buffer to an integer. | |
| 36 * Parses up to the first non-numeric character. If no number is found an | |
| 37 * IllegalArgumentException is thrown | |
| 38 * @param buffer A buffer containing an integer. The position is not changed. | |
| 39 * @return an int | |
| 40 */ | |
| 41 public static int toInt(Buffer buffer) | |
| 42 { | |
| 43 int val= 0; | |
| 44 boolean started= false; | |
| 45 boolean minus= false; | |
| 46 for (int i= buffer.getIndex(); i < buffer.putIndex(); i++) | |
| 47 { | |
| 48 byte b= buffer.peek(i); | |
| 49 if (b <= SPACE) | |
| 50 { | |
| 51 if (started) | |
| 52 break; | |
| 53 } | |
| 54 else if (b >= '0' && b <= '9') | |
| 55 { | |
| 56 val= val * 10 + (b - '0'); | |
| 57 started= true; | |
| 58 } | |
| 59 else if (b == MINUS && !started) | |
| 60 { | |
| 61 minus= true; | |
| 62 } | |
| 63 else | |
| 64 break; | |
| 65 } | |
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66 |
| 1018 | 67 if (started) |
| 68 return minus ? (-val) : val; | |
| 69 throw new NumberFormatException(buffer.toString()); | |
| 70 } | |
| 71 | |
| 72 /** | |
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73 * Convert string to an long. |
| 1018 | 74 * Parses up to the first non-numeric character. If no number is found an |
| 75 * IllegalArgumentException is thrown | |
| 76 */ | |
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77 public static long toLong(String s) |
| 1018 | 78 { |
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79 long val = 0; |
| 1018 | 80 boolean started= false; |
| 81 boolean minus= false; | |
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82 for (int i = 0; i < s.length(); i++) |
| 1018 | 83 { |
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84 char c = s.charAt(i); |
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85 if (c <= ' ') |
| 1018 | 86 { |
| 87 if (started) | |
| 88 break; | |
| 89 } | |
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90 else if (c >= '0' && c <= '9') |
| 1018 | 91 { |
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92 val= val * 10L + (c - '0'); |
| 1018 | 93 started= true; |
| 94 } | |
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95 else if (c == '-' && !started) |
| 1018 | 96 { |
| 97 minus= true; | |
| 98 } | |
| 99 else | |
| 100 break; | |
| 101 } | |
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102 |
| 1018 | 103 if (started) |
| 104 return minus ? (-val) : val; | |
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105 throw new NumberFormatException(s); |
| 1018 | 106 } |
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107 |
| 1018 | 108 public static void putHexInt(Buffer buffer, int n) |
| 109 { | |
| 110 | |
| 111 if (n < 0) | |
| 112 { | |
| 113 buffer.put((byte)'-'); | |
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114 |
| 1018 | 115 if (n == Integer.MIN_VALUE) |
| 116 { | |
| 117 buffer.put((byte)(0x7f&'8')); | |
| 118 buffer.put((byte)(0x7f&'0')); | |
| 119 buffer.put((byte)(0x7f&'0')); | |
| 120 buffer.put((byte)(0x7f&'0')); | |
| 121 buffer.put((byte)(0x7f&'0')); | |
| 122 buffer.put((byte)(0x7f&'0')); | |
| 123 buffer.put((byte)(0x7f&'0')); | |
| 124 buffer.put((byte)(0x7f&'0')); | |
| 125 | |
| 126 return; | |
| 127 } | |
| 128 n= -n; | |
| 129 } | |
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130 |
| 1018 | 131 if (n < 0x10) |
| 132 { | |
| 133 buffer.put(DIGIT[n]); | |
| 134 } | |
| 135 else | |
| 136 { | |
| 137 boolean started= false; | |
| 138 // This assumes constant time int arithmatic | |
| 139 for (int i= 0; i < hexDivisors.length; i++) | |
| 140 { | |
| 141 if (n < hexDivisors[i]) | |
| 142 { | |
| 143 if (started) | |
| 144 buffer.put((byte)'0'); | |
| 145 continue; | |
| 146 } | |
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147 |
| 1018 | 148 started= true; |
| 149 int d= n / hexDivisors[i]; | |
| 150 buffer.put(DIGIT[d]); | |
| 151 n= n - d * hexDivisors[i]; | |
| 152 } | |
| 153 } | |
| 154 } | |
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155 |
| 1018 | 156 /* ------------------------------------------------------------ */ |
| 157 /** | |
| 158 * Add hex integer BEFORE current getIndex. | |
| 159 * @param buffer | |
| 160 * @param n | |
| 161 */ | |
| 162 public static void prependHexInt(Buffer buffer, int n) | |
| 163 { | |
| 164 if (n==0) | |
| 165 { | |
| 166 int gi=buffer.getIndex(); | |
| 167 buffer.poke(--gi,(byte)'0'); | |
| 168 buffer.setGetIndex(gi); | |
| 169 } | |
| 170 else | |
| 171 { | |
| 172 boolean minus=false; | |
| 173 if (n<0) | |
| 174 { | |
| 175 minus=true; | |
| 176 n=-n; | |
| 177 } | |
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178 |
| 1018 | 179 int gi=buffer.getIndex(); |
| 180 while(n>0) | |
| 181 { | |
| 182 int d = 0xf&n; | |
| 183 n=n>>4; | |
| 184 buffer.poke(--gi,DIGIT[d]); | |
| 185 } | |
| 186 | |
| 187 if (minus) | |
| 188 buffer.poke(--gi,(byte)'-'); | |
| 189 buffer.setGetIndex(gi); | |
| 190 } | |
| 191 } | |
| 192 | |
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193 |
| 1018 | 194 public static void putDecLong(Buffer buffer, long n) |
| 195 { | |
| 196 if (n < 0) | |
| 197 { | |
| 198 buffer.put((byte)'-'); | |
| 199 | |
| 200 if (n == Long.MIN_VALUE) | |
| 201 { | |
| 202 buffer.put((byte)'9'); | |
| 203 n= 223372036854775808L; | |
| 204 } | |
| 205 else | |
| 206 n= -n; | |
| 207 } | |
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208 |
| 1018 | 209 if (n < 10) |
| 210 { | |
| 211 buffer.put(DIGIT[(int)n]); | |
| 212 } | |
| 213 else | |
| 214 { | |
| 215 boolean started= false; | |
| 216 // This assumes constant time int arithmatic | |
| 217 for (int i= 0; i < decDivisorsL.length; i++) | |
| 218 { | |
| 219 if (n < decDivisorsL[i]) | |
| 220 { | |
| 221 if (started) | |
| 222 buffer.put((byte)'0'); | |
| 223 continue; | |
| 224 } | |
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225 |
| 1018 | 226 started= true; |
| 227 long d= n / decDivisorsL[i]; | |
| 228 buffer.put(DIGIT[(int)d]); | |
| 229 n= n - d * decDivisorsL[i]; | |
| 230 } | |
| 231 } | |
| 232 } | |
| 233 | |
| 234 private final static int[] hexDivisors= | |
| 235 { | |
| 236 0x10000000, | |
| 237 0x1000000, | |
| 238 0x100000, | |
| 239 0x10000, | |
| 240 0x1000, | |
| 241 0x100, | |
| 242 0x10, | |
| 243 0x1 | |
| 244 }; | |
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245 |
| 1018 | 246 private final static long[] decDivisorsL= |
| 247 { | |
| 248 1000000000000000000L, | |
| 249 100000000000000000L, | |
| 250 10000000000000000L, | |
| 251 1000000000000000L, | |
| 252 100000000000000L, | |
| 253 10000000000000L, | |
| 254 1000000000000L, | |
| 255 100000000000L, | |
| 256 10000000000L, | |
| 257 1000000000L, | |
| 258 100000000L, | |
| 259 10000000L, | |
| 260 1000000L, | |
| 261 100000L, | |
| 262 10000L, | |
| 263 1000L, | |
| 264 100L, | |
| 265 10L, | |
| 266 1L | |
| 267 }; | |
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268 |
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269 |
| 1018 | 270 public static void putCRLF(Buffer buffer) |
| 271 { | |
| 272 buffer.put((byte)13); | |
| 273 buffer.put((byte)10); | |
| 274 } | |
| 1021 | 275 |
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276 } |