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annotate src/org/eclipse/jetty/io/BufferUtil.java @ 1056:7d872cc72ec2
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| author | Franklin Schmidt <fschmidt@gmail.com> |
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| date | Tue, 08 Nov 2016 01:19:36 -0700 |
| parents | e6ca3cb52837 |
| children | 013939bfc9e8 |
| 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 |
| 1046 | 21 import java.nio.ByteBuffer; |
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22 import java.nio.charset.Charset; |
| 1046 | 23 import org.eclipse.jetty.util.StringUtil; |
| 24 | |
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25 |
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26 /* ------------------------------------------------------------------------------- */ |
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27 /** Buffer utility methods. |
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28 * |
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29 * |
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30 */ |
| 1018 | 31 public final class BufferUtil |
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32 { |
| 1056 | 33 private static final byte[] DIGIT= |
| 1018 | 34 {(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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35 |
| 1018 | 36 |
| 37 /** | |
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38 * Convert string to an long. |
| 1018 | 39 * Parses up to the first non-numeric character. If no number is found an |
| 40 * IllegalArgumentException is thrown | |
| 41 */ | |
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42 public static long toLong(String s) |
| 1018 | 43 { |
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44 long val = 0; |
| 1018 | 45 boolean started= false; |
| 46 boolean minus= false; | |
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47 for (int i = 0; i < s.length(); i++) |
| 1018 | 48 { |
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49 char c = s.charAt(i); |
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50 if (c <= ' ') |
| 1018 | 51 { |
| 52 if (started) | |
| 53 break; | |
| 54 } | |
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55 else if (c >= '0' && c <= '9') |
| 1018 | 56 { |
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57 val= val * 10L + (c - '0'); |
| 1018 | 58 started= true; |
| 59 } | |
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60 else if (c == '-' && !started) |
| 1018 | 61 { |
| 62 minus= true; | |
| 63 } | |
| 64 else | |
| 65 break; | |
| 66 } | |
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67 |
| 1018 | 68 if (started) |
| 69 return minus ? (-val) : val; | |
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70 throw new NumberFormatException(s); |
| 1018 | 71 } |
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72 |
| 1048 | 73 public static void putHexInt(JBuffer buffer, int n) |
| 1018 | 74 { |
| 75 | |
| 76 if (n < 0) | |
| 77 { | |
| 78 buffer.put((byte)'-'); | |
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79 |
| 1018 | 80 if (n == Integer.MIN_VALUE) |
| 81 { | |
| 82 buffer.put((byte)(0x7f&'8')); | |
| 83 buffer.put((byte)(0x7f&'0')); | |
| 84 buffer.put((byte)(0x7f&'0')); | |
| 85 buffer.put((byte)(0x7f&'0')); | |
| 86 buffer.put((byte)(0x7f&'0')); | |
| 87 buffer.put((byte)(0x7f&'0')); | |
| 88 buffer.put((byte)(0x7f&'0')); | |
| 89 buffer.put((byte)(0x7f&'0')); | |
| 90 | |
| 91 return; | |
| 92 } | |
| 93 n= -n; | |
| 94 } | |
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95 |
| 1018 | 96 if (n < 0x10) |
| 97 { | |
| 98 buffer.put(DIGIT[n]); | |
| 99 } | |
| 100 else | |
| 101 { | |
| 102 boolean started= false; | |
| 103 // This assumes constant time int arithmatic | |
| 104 for (int i= 0; i < hexDivisors.length; i++) | |
| 105 { | |
| 106 if (n < hexDivisors[i]) | |
| 107 { | |
| 108 if (started) | |
| 109 buffer.put((byte)'0'); | |
| 110 continue; | |
| 111 } | |
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112 |
| 1018 | 113 started= true; |
| 1056 | 114 int d = n / hexDivisors[i]; |
| 1018 | 115 buffer.put(DIGIT[d]); |
| 116 n= n - d * hexDivisors[i]; | |
| 117 } | |
| 118 } | |
| 119 } | |
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120 |
| 1018 | 121 /* ------------------------------------------------------------ */ |
| 122 /** | |
| 123 * Add hex integer BEFORE current getIndex. | |
| 124 * @param buffer | |
| 125 * @param n | |
| 126 */ | |
| 1048 | 127 public static void prependHexInt(JBuffer buffer, int n) |
| 1018 | 128 { |
| 129 if (n==0) | |
| 130 { | |
| 131 int gi=buffer.getIndex(); | |
| 132 buffer.poke(--gi,(byte)'0'); | |
| 133 buffer.setGetIndex(gi); | |
| 134 } | |
| 135 else | |
| 136 { | |
| 137 boolean minus=false; | |
| 138 if (n<0) | |
| 139 { | |
| 140 minus=true; | |
| 141 n=-n; | |
| 142 } | |
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143 |
| 1018 | 144 int gi=buffer.getIndex(); |
| 145 while(n>0) | |
| 146 { | |
| 147 int d = 0xf&n; | |
| 148 n=n>>4; | |
| 149 buffer.poke(--gi,DIGIT[d]); | |
| 150 } | |
| 151 | |
| 152 if (minus) | |
| 153 buffer.poke(--gi,(byte)'-'); | |
| 154 buffer.setGetIndex(gi); | |
| 155 } | |
| 156 } | |
| 157 | |
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158 |
| 1048 | 159 public static void putDecLong(JBuffer buffer, long n) |
| 1018 | 160 { |
| 161 if (n < 0) | |
| 162 { | |
| 163 buffer.put((byte)'-'); | |
| 164 | |
| 165 if (n == Long.MIN_VALUE) | |
| 166 { | |
| 167 buffer.put((byte)'9'); | |
| 1056 | 168 n = 223372036854775808L; |
| 1018 | 169 } |
| 170 else | |
| 1056 | 171 n = -n; |
| 1018 | 172 } |
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173 |
| 1018 | 174 if (n < 10) |
| 175 { | |
| 176 buffer.put(DIGIT[(int)n]); | |
| 177 } | |
| 178 else | |
| 179 { | |
| 180 boolean started= false; | |
| 181 // This assumes constant time int arithmatic | |
| 182 for (int i= 0; i < decDivisorsL.length; i++) | |
| 183 { | |
| 184 if (n < decDivisorsL[i]) | |
| 185 { | |
| 186 if (started) | |
| 187 buffer.put((byte)'0'); | |
| 188 continue; | |
| 189 } | |
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190 |
| 1018 | 191 started= true; |
| 192 long d= n / decDivisorsL[i]; | |
| 193 buffer.put(DIGIT[(int)d]); | |
| 194 n= n - d * decDivisorsL[i]; | |
| 195 } | |
| 196 } | |
| 197 } | |
| 198 | |
| 199 private final static int[] hexDivisors= | |
| 200 { | |
| 201 0x10000000, | |
| 202 0x1000000, | |
| 203 0x100000, | |
| 204 0x10000, | |
| 205 0x1000, | |
| 206 0x100, | |
| 207 0x10, | |
| 208 0x1 | |
| 209 }; | |
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210 |
| 1018 | 211 private final static long[] decDivisorsL= |
| 212 { | |
| 213 1000000000000000000L, | |
| 214 100000000000000000L, | |
| 215 10000000000000000L, | |
| 216 1000000000000000L, | |
| 217 100000000000000L, | |
| 218 10000000000000L, | |
| 219 1000000000000L, | |
| 220 100000000000L, | |
| 221 10000000000L, | |
| 222 1000000000L, | |
| 223 100000000L, | |
| 224 10000000L, | |
| 225 1000000L, | |
| 226 100000L, | |
| 227 10000L, | |
| 228 1000L, | |
| 229 100L, | |
| 230 10L, | |
| 231 1L | |
| 232 }; | |
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233 |
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234 |
| 1048 | 235 public static void putCRLF(JBuffer buffer) |
| 1018 | 236 { |
| 237 buffer.put((byte)13); | |
| 238 buffer.put((byte)10); | |
| 239 } | |
| 1021 | 240 |
| 1046 | 241 |
| 1048 | 242 public static final JBuffer EMPTY_BUFFER = new JBuffer(ByteBuffer.allocate(0)); |
| 1046 | 243 |
| 1048 | 244 public static JBuffer wrap(byte[] array,int offset,int length) { |
| 1046 | 245 return new JBuffer(ByteBuffer.wrap(array,offset,length)); |
| 246 } | |
| 247 | |
| 1048 | 248 public static JBuffer wrap(byte[] array) { |
| 1046 | 249 return new JBuffer(ByteBuffer.wrap(array)); |
| 250 } | |
| 251 | |
| 1048 | 252 public static JBuffer wrap(String s) { |
| 1046 | 253 byte[] bytes = StringUtil.getBytes(s); |
| 254 ByteBuffer bb = ByteBuffer.wrap(bytes).asReadOnlyBuffer(); | |
| 255 return new JBuffer(bb); | |
| 256 } | |
| 257 | |
| 1048 | 258 public static JBuffer newBuffer(int size) { |
| 1046 | 259 ByteBuffer bb = ByteBuffer.allocate(size); |
| 260 bb.limit(0); | |
| 261 return new JBuffer(bb); | |
| 262 } | |
| 263 | |
| 1048 | 264 public static JBuffer newDirectBuffer(int size) { |
| 1046 | 265 ByteBuffer bb = ByteBuffer.allocateDirect(size); |
| 266 bb.limit(0); | |
| 267 return new JBuffer(bb); | |
| 268 } | |
| 269 | |
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270 |
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271 |
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272 private static final Charset ISO_8859_1 = Charset.forName("ISO-8859-1"); |
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273 |
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274 public static String getString(JBuffer buffer) { |
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275 byte[] bytes = new byte[buffer.remaining()]; |
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276 buffer.get(bytes); |
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277 return new String(bytes,ISO_8859_1); |
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278 } |
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279 } |