[120] | 1 | /** |
---|
| 2 | * Licensed to the Apache Software Foundation (ASF) under one |
---|
| 3 | * or more contributor license agreements. See the NOTICE file |
---|
| 4 | * distributed with this work for additional information |
---|
| 5 | * regarding copyright ownership. The ASF licenses this file |
---|
| 6 | * to you under the Apache License, Version 2.0 (the |
---|
| 7 | * "License"); you may not use this file except in compliance |
---|
| 8 | * with the License. You may obtain a copy of the License at |
---|
| 9 | * |
---|
| 10 | * http://www.apache.org/licenses/LICENSE-2.0 |
---|
| 11 | * |
---|
| 12 | * Unless required by applicable law or agreed to in writing, software |
---|
| 13 | * distributed under the License is distributed on an "AS IS" BASIS, |
---|
| 14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
---|
| 15 | * See the License for the specific language governing permissions and |
---|
| 16 | * limitations under the License. |
---|
| 17 | */ |
---|
| 18 | |
---|
| 19 | package org.apache.hadoop.record; |
---|
| 20 | |
---|
| 21 | import java.io.DataInput; |
---|
| 22 | import java.io.DataOutput; |
---|
| 23 | import java.io.IOException; |
---|
| 24 | import org.apache.hadoop.io.WritableComparator; |
---|
| 25 | import org.apache.hadoop.io.WritableUtils; |
---|
| 26 | |
---|
| 27 | /** |
---|
| 28 | * Various utility functions for Hadooop record I/O runtime. |
---|
| 29 | */ |
---|
| 30 | public class Utils { |
---|
| 31 | |
---|
| 32 | /** Cannot create a new instance of Utils */ |
---|
| 33 | private Utils() { |
---|
| 34 | } |
---|
| 35 | |
---|
| 36 | public static final char[] hexchars = { '0', '1', '2', '3', '4', '5', |
---|
| 37 | '6', '7', '8', '9', 'A', 'B', |
---|
| 38 | 'C', 'D', 'E', 'F' }; |
---|
| 39 | /** |
---|
| 40 | * |
---|
| 41 | * @param s |
---|
| 42 | * @return |
---|
| 43 | */ |
---|
| 44 | static String toXMLString(String s) { |
---|
| 45 | StringBuffer sb = new StringBuffer(); |
---|
| 46 | for (int idx = 0; idx < s.length(); idx++) { |
---|
| 47 | char ch = s.charAt(idx); |
---|
| 48 | if (ch == '<') { |
---|
| 49 | sb.append("<"); |
---|
| 50 | } else if (ch == '&') { |
---|
| 51 | sb.append("&"); |
---|
| 52 | } else if (ch == '%') { |
---|
| 53 | sb.append("%0025"); |
---|
| 54 | } else if (ch < 0x20 || |
---|
| 55 | (ch > 0xD7FF && ch < 0xE000) || |
---|
| 56 | (ch > 0xFFFD)) { |
---|
| 57 | sb.append("%"); |
---|
| 58 | sb.append(hexchars[(ch & 0xF000) >> 12]); |
---|
| 59 | sb.append(hexchars[(ch & 0x0F00) >> 8]); |
---|
| 60 | sb.append(hexchars[(ch & 0x00F0) >> 4]); |
---|
| 61 | sb.append(hexchars[(ch & 0x000F)]); |
---|
| 62 | } else { |
---|
| 63 | sb.append(ch); |
---|
| 64 | } |
---|
| 65 | } |
---|
| 66 | return sb.toString(); |
---|
| 67 | } |
---|
| 68 | |
---|
| 69 | static private int h2c(char ch) { |
---|
| 70 | if (ch >= '0' && ch <= '9') { |
---|
| 71 | return ch - '0'; |
---|
| 72 | } else if (ch >= 'A' && ch <= 'F') { |
---|
| 73 | return ch - 'A' + 10; |
---|
| 74 | } else if (ch >= 'a' && ch <= 'f') { |
---|
| 75 | return ch - 'a' + 10; |
---|
| 76 | } |
---|
| 77 | return 0; |
---|
| 78 | } |
---|
| 79 | |
---|
| 80 | /** |
---|
| 81 | * |
---|
| 82 | * @param s |
---|
| 83 | * @return |
---|
| 84 | */ |
---|
| 85 | static String fromXMLString(String s) { |
---|
| 86 | StringBuffer sb = new StringBuffer(); |
---|
| 87 | for (int idx = 0; idx < s.length();) { |
---|
| 88 | char ch = s.charAt(idx++); |
---|
| 89 | if (ch == '%') { |
---|
| 90 | int ch1 = h2c(s.charAt(idx++)) << 12; |
---|
| 91 | int ch2 = h2c(s.charAt(idx++)) << 8; |
---|
| 92 | int ch3 = h2c(s.charAt(idx++)) << 4; |
---|
| 93 | int ch4 = h2c(s.charAt(idx++)); |
---|
| 94 | char res = (char)(ch1 | ch2 | ch3 | ch4); |
---|
| 95 | sb.append(res); |
---|
| 96 | } else { |
---|
| 97 | sb.append(ch); |
---|
| 98 | } |
---|
| 99 | } |
---|
| 100 | return sb.toString(); |
---|
| 101 | } |
---|
| 102 | |
---|
| 103 | /** |
---|
| 104 | * |
---|
| 105 | * @param s |
---|
| 106 | * @return |
---|
| 107 | */ |
---|
| 108 | static String toCSVString(String s) { |
---|
| 109 | StringBuffer sb = new StringBuffer(s.length()+1); |
---|
| 110 | sb.append('\''); |
---|
| 111 | int len = s.length(); |
---|
| 112 | for (int i = 0; i < len; i++) { |
---|
| 113 | char c = s.charAt(i); |
---|
| 114 | switch(c) { |
---|
| 115 | case '\0': |
---|
| 116 | sb.append("%00"); |
---|
| 117 | break; |
---|
| 118 | case '\n': |
---|
| 119 | sb.append("%0A"); |
---|
| 120 | break; |
---|
| 121 | case '\r': |
---|
| 122 | sb.append("%0D"); |
---|
| 123 | break; |
---|
| 124 | case ',': |
---|
| 125 | sb.append("%2C"); |
---|
| 126 | break; |
---|
| 127 | case '}': |
---|
| 128 | sb.append("%7D"); |
---|
| 129 | break; |
---|
| 130 | case '%': |
---|
| 131 | sb.append("%25"); |
---|
| 132 | break; |
---|
| 133 | default: |
---|
| 134 | sb.append(c); |
---|
| 135 | } |
---|
| 136 | } |
---|
| 137 | return sb.toString(); |
---|
| 138 | } |
---|
| 139 | |
---|
| 140 | /** |
---|
| 141 | * |
---|
| 142 | * @param s |
---|
| 143 | * @throws java.io.IOException |
---|
| 144 | * @return |
---|
| 145 | */ |
---|
| 146 | static String fromCSVString(String s) throws IOException { |
---|
| 147 | if (s.charAt(0) != '\'') { |
---|
| 148 | throw new IOException("Error deserializing string."); |
---|
| 149 | } |
---|
| 150 | int len = s.length(); |
---|
| 151 | StringBuffer sb = new StringBuffer(len-1); |
---|
| 152 | for (int i = 1; i < len; i++) { |
---|
| 153 | char c = s.charAt(i); |
---|
| 154 | if (c == '%') { |
---|
| 155 | char ch1 = s.charAt(i+1); |
---|
| 156 | char ch2 = s.charAt(i+2); |
---|
| 157 | i += 2; |
---|
| 158 | if (ch1 == '0' && ch2 == '0') { |
---|
| 159 | sb.append('\0'); |
---|
| 160 | } else if (ch1 == '0' && ch2 == 'A') { |
---|
| 161 | sb.append('\n'); |
---|
| 162 | } else if (ch1 == '0' && ch2 == 'D') { |
---|
| 163 | sb.append('\r'); |
---|
| 164 | } else if (ch1 == '2' && ch2 == 'C') { |
---|
| 165 | sb.append(','); |
---|
| 166 | } else if (ch1 == '7' && ch2 == 'D') { |
---|
| 167 | sb.append('}'); |
---|
| 168 | } else if (ch1 == '2' && ch2 == '5') { |
---|
| 169 | sb.append('%'); |
---|
| 170 | } else { |
---|
| 171 | throw new IOException("Error deserializing string."); |
---|
| 172 | } |
---|
| 173 | } else { |
---|
| 174 | sb.append(c); |
---|
| 175 | } |
---|
| 176 | } |
---|
| 177 | return sb.toString(); |
---|
| 178 | } |
---|
| 179 | |
---|
| 180 | /** |
---|
| 181 | * |
---|
| 182 | * @param s |
---|
| 183 | * @return |
---|
| 184 | */ |
---|
| 185 | static String toXMLBuffer(Buffer s) { |
---|
| 186 | return s.toString(); |
---|
| 187 | } |
---|
| 188 | |
---|
| 189 | /** |
---|
| 190 | * |
---|
| 191 | * @param s |
---|
| 192 | * @throws java.io.IOException |
---|
| 193 | * @return |
---|
| 194 | */ |
---|
| 195 | static Buffer fromXMLBuffer(String s) |
---|
| 196 | throws IOException { |
---|
| 197 | if (s.length() == 0) { return new Buffer(); } |
---|
| 198 | int blen = s.length()/2; |
---|
| 199 | byte[] barr = new byte[blen]; |
---|
| 200 | for (int idx = 0; idx < blen; idx++) { |
---|
| 201 | char c1 = s.charAt(2*idx); |
---|
| 202 | char c2 = s.charAt(2*idx+1); |
---|
| 203 | barr[idx] = (byte)Integer.parseInt(""+c1+c2, 16); |
---|
| 204 | } |
---|
| 205 | return new Buffer(barr); |
---|
| 206 | } |
---|
| 207 | |
---|
| 208 | /** |
---|
| 209 | * |
---|
| 210 | * @param buf |
---|
| 211 | * @return |
---|
| 212 | */ |
---|
| 213 | static String toCSVBuffer(Buffer buf) { |
---|
| 214 | StringBuffer sb = new StringBuffer("#"); |
---|
| 215 | sb.append(buf.toString()); |
---|
| 216 | return sb.toString(); |
---|
| 217 | } |
---|
| 218 | |
---|
| 219 | /** |
---|
| 220 | * Converts a CSV-serialized representation of buffer to a new |
---|
| 221 | * Buffer |
---|
| 222 | * @param s CSV-serialized representation of buffer |
---|
| 223 | * @throws java.io.IOException |
---|
| 224 | * @return Deserialized Buffer |
---|
| 225 | */ |
---|
| 226 | static Buffer fromCSVBuffer(String s) |
---|
| 227 | throws IOException { |
---|
| 228 | if (s.charAt(0) != '#') { |
---|
| 229 | throw new IOException("Error deserializing buffer."); |
---|
| 230 | } |
---|
| 231 | if (s.length() == 1) { return new Buffer(); } |
---|
| 232 | int blen = (s.length()-1)/2; |
---|
| 233 | byte[] barr = new byte[blen]; |
---|
| 234 | for (int idx = 0; idx < blen; idx++) { |
---|
| 235 | char c1 = s.charAt(2*idx+1); |
---|
| 236 | char c2 = s.charAt(2*idx+2); |
---|
| 237 | barr[idx] = (byte)Integer.parseInt(""+c1+c2, 16); |
---|
| 238 | } |
---|
| 239 | return new Buffer(barr); |
---|
| 240 | } |
---|
| 241 | |
---|
| 242 | private static int utf8LenForCodePoint(final int cpt) throws IOException { |
---|
| 243 | if (cpt >=0 && cpt <= 0x7F) { |
---|
| 244 | return 1; |
---|
| 245 | } |
---|
| 246 | if (cpt >= 0x80 && cpt <= 0x07FF) { |
---|
| 247 | return 2; |
---|
| 248 | } |
---|
| 249 | if ((cpt >= 0x0800 && cpt < 0xD800) || |
---|
| 250 | (cpt > 0xDFFF && cpt <= 0xFFFD)) { |
---|
| 251 | return 3; |
---|
| 252 | } |
---|
| 253 | if (cpt >= 0x10000 && cpt <= 0x10FFFF) { |
---|
| 254 | return 4; |
---|
| 255 | } |
---|
| 256 | throw new IOException("Illegal Unicode Codepoint "+ |
---|
| 257 | Integer.toHexString(cpt)+" in string."); |
---|
| 258 | } |
---|
| 259 | |
---|
| 260 | private static final int B10 = Integer.parseInt("10000000", 2); |
---|
| 261 | private static final int B110 = Integer.parseInt("11000000", 2); |
---|
| 262 | private static final int B1110 = Integer.parseInt("11100000", 2); |
---|
| 263 | private static final int B11110 = Integer.parseInt("11110000", 2); |
---|
| 264 | private static final int B11 = Integer.parseInt("11000000", 2); |
---|
| 265 | private static final int B111 = Integer.parseInt("11100000", 2); |
---|
| 266 | private static final int B1111 = Integer.parseInt("11110000", 2); |
---|
| 267 | private static final int B11111 = Integer.parseInt("11111000", 2); |
---|
| 268 | |
---|
| 269 | private static int writeUtf8(int cpt, final byte[] bytes, final int offset) |
---|
| 270 | throws IOException { |
---|
| 271 | if (cpt >=0 && cpt <= 0x7F) { |
---|
| 272 | bytes[offset] = (byte) cpt; |
---|
| 273 | return 1; |
---|
| 274 | } |
---|
| 275 | if (cpt >= 0x80 && cpt <= 0x07FF) { |
---|
| 276 | bytes[offset+1] = (byte) (B10 | (cpt & 0x3F)); |
---|
| 277 | cpt = cpt >> 6; |
---|
| 278 | bytes[offset] = (byte) (B110 | (cpt & 0x1F)); |
---|
| 279 | return 2; |
---|
| 280 | } |
---|
| 281 | if ((cpt >= 0x0800 && cpt < 0xD800) || |
---|
| 282 | (cpt > 0xDFFF && cpt <= 0xFFFD)) { |
---|
| 283 | bytes[offset+2] = (byte) (B10 | (cpt & 0x3F)); |
---|
| 284 | cpt = cpt >> 6; |
---|
| 285 | bytes[offset+1] = (byte) (B10 | (cpt & 0x3F)); |
---|
| 286 | cpt = cpt >> 6; |
---|
| 287 | bytes[offset] = (byte) (B1110 | (cpt & 0x0F)); |
---|
| 288 | return 3; |
---|
| 289 | } |
---|
| 290 | if (cpt >= 0x10000 && cpt <= 0x10FFFF) { |
---|
| 291 | bytes[offset+3] = (byte) (B10 | (cpt & 0x3F)); |
---|
| 292 | cpt = cpt >> 6; |
---|
| 293 | bytes[offset+2] = (byte) (B10 | (cpt & 0x3F)); |
---|
| 294 | cpt = cpt >> 6; |
---|
| 295 | bytes[offset+1] = (byte) (B10 | (cpt & 0x3F)); |
---|
| 296 | cpt = cpt >> 6; |
---|
| 297 | bytes[offset] = (byte) (B11110 | (cpt & 0x07)); |
---|
| 298 | return 4; |
---|
| 299 | } |
---|
| 300 | throw new IOException("Illegal Unicode Codepoint "+ |
---|
| 301 | Integer.toHexString(cpt)+" in string."); |
---|
| 302 | } |
---|
| 303 | |
---|
| 304 | static void toBinaryString(final DataOutput out, final String str) |
---|
| 305 | throws IOException { |
---|
| 306 | final int strlen = str.length(); |
---|
| 307 | byte[] bytes = new byte[strlen*4]; // Codepoints expand to 4 bytes max |
---|
| 308 | int utf8Len = 0; |
---|
| 309 | int idx = 0; |
---|
| 310 | while(idx < strlen) { |
---|
| 311 | final int cpt = str.codePointAt(idx); |
---|
| 312 | idx += Character.isSupplementaryCodePoint(cpt) ? 2 : 1; |
---|
| 313 | utf8Len += writeUtf8(cpt, bytes, utf8Len); |
---|
| 314 | } |
---|
| 315 | writeVInt(out, utf8Len); |
---|
| 316 | out.write(bytes, 0, utf8Len); |
---|
| 317 | } |
---|
| 318 | |
---|
| 319 | static boolean isValidCodePoint(int cpt) { |
---|
| 320 | return !((cpt > 0x10FFFF) || |
---|
| 321 | (cpt >= 0xD800 && cpt <= 0xDFFF) || |
---|
| 322 | (cpt >= 0xFFFE && cpt <=0xFFFF)); |
---|
| 323 | } |
---|
| 324 | |
---|
| 325 | private static int utf8ToCodePoint(int b1, int b2, int b3, int b4) { |
---|
| 326 | int cpt = 0; |
---|
| 327 | cpt = (((b1 & ~B11111) << 18) | |
---|
| 328 | ((b2 & ~B11) << 12) | |
---|
| 329 | ((b3 & ~B11) << 6) | |
---|
| 330 | (b4 & ~B11)); |
---|
| 331 | return cpt; |
---|
| 332 | } |
---|
| 333 | |
---|
| 334 | private static int utf8ToCodePoint(int b1, int b2, int b3) { |
---|
| 335 | int cpt = 0; |
---|
| 336 | cpt = (((b1 & ~B1111) << 12) | ((b2 & ~B11) << 6) | (b3 & ~B11)); |
---|
| 337 | return cpt; |
---|
| 338 | } |
---|
| 339 | |
---|
| 340 | private static int utf8ToCodePoint(int b1, int b2) { |
---|
| 341 | int cpt = 0; |
---|
| 342 | cpt = (((b1 & ~B111) << 6) | (b2 & ~B11)); |
---|
| 343 | return cpt; |
---|
| 344 | } |
---|
| 345 | |
---|
| 346 | private static void checkB10(int b) throws IOException { |
---|
| 347 | if ((b & B11) != B10) { |
---|
| 348 | throw new IOException("Invalid UTF-8 representation."); |
---|
| 349 | } |
---|
| 350 | } |
---|
| 351 | |
---|
| 352 | static String fromBinaryString(final DataInput din) throws IOException { |
---|
| 353 | final int utf8Len = readVInt(din); |
---|
| 354 | final byte[] bytes = new byte[utf8Len]; |
---|
| 355 | din.readFully(bytes); |
---|
| 356 | int len = 0; |
---|
| 357 | // For the most commmon case, i.e. ascii, numChars = utf8Len |
---|
| 358 | StringBuilder sb = new StringBuilder(utf8Len); |
---|
| 359 | while(len < utf8Len) { |
---|
| 360 | int cpt = 0; |
---|
| 361 | final int b1 = bytes[len++] & 0xFF; |
---|
| 362 | if (b1 <= 0x7F) { |
---|
| 363 | cpt = b1; |
---|
| 364 | } else if ((b1 & B11111) == B11110) { |
---|
| 365 | int b2 = bytes[len++] & 0xFF; |
---|
| 366 | checkB10(b2); |
---|
| 367 | int b3 = bytes[len++] & 0xFF; |
---|
| 368 | checkB10(b3); |
---|
| 369 | int b4 = bytes[len++] & 0xFF; |
---|
| 370 | checkB10(b4); |
---|
| 371 | cpt = utf8ToCodePoint(b1, b2, b3, b4); |
---|
| 372 | } else if ((b1 & B1111) == B1110) { |
---|
| 373 | int b2 = bytes[len++] & 0xFF; |
---|
| 374 | checkB10(b2); |
---|
| 375 | int b3 = bytes[len++] & 0xFF; |
---|
| 376 | checkB10(b3); |
---|
| 377 | cpt = utf8ToCodePoint(b1, b2, b3); |
---|
| 378 | } else if ((b1 & B111) == B110) { |
---|
| 379 | int b2 = bytes[len++] & 0xFF; |
---|
| 380 | checkB10(b2); |
---|
| 381 | cpt = utf8ToCodePoint(b1, b2); |
---|
| 382 | } else { |
---|
| 383 | throw new IOException("Invalid UTF-8 byte "+Integer.toHexString(b1)+ |
---|
| 384 | " at offset "+(len-1)+" in length of "+utf8Len); |
---|
| 385 | } |
---|
| 386 | if (!isValidCodePoint(cpt)) { |
---|
| 387 | throw new IOException("Illegal Unicode Codepoint "+ |
---|
| 388 | Integer.toHexString(cpt)+" in stream."); |
---|
| 389 | } |
---|
| 390 | sb.appendCodePoint(cpt); |
---|
| 391 | } |
---|
| 392 | return sb.toString(); |
---|
| 393 | } |
---|
| 394 | |
---|
| 395 | /** Parse a float from a byte array. */ |
---|
| 396 | public static float readFloat(byte[] bytes, int start) { |
---|
| 397 | return WritableComparator.readFloat(bytes, start); |
---|
| 398 | } |
---|
| 399 | |
---|
| 400 | /** Parse a double from a byte array. */ |
---|
| 401 | public static double readDouble(byte[] bytes, int start) { |
---|
| 402 | return WritableComparator.readDouble(bytes, start); |
---|
| 403 | } |
---|
| 404 | |
---|
| 405 | /** |
---|
| 406 | * Reads a zero-compressed encoded long from a byte array and returns it. |
---|
| 407 | * @param bytes byte array with decode long |
---|
| 408 | * @param start starting index |
---|
| 409 | * @throws java.io.IOException |
---|
| 410 | * @return deserialized long |
---|
| 411 | */ |
---|
| 412 | public static long readVLong(byte[] bytes, int start) throws IOException { |
---|
| 413 | return WritableComparator.readVLong(bytes, start); |
---|
| 414 | } |
---|
| 415 | |
---|
| 416 | /** |
---|
| 417 | * Reads a zero-compressed encoded integer from a byte array and returns it. |
---|
| 418 | * @param bytes byte array with the encoded integer |
---|
| 419 | * @param start start index |
---|
| 420 | * @throws java.io.IOException |
---|
| 421 | * @return deserialized integer |
---|
| 422 | */ |
---|
| 423 | public static int readVInt(byte[] bytes, int start) throws IOException { |
---|
| 424 | return WritableComparator.readVInt(bytes, start); |
---|
| 425 | } |
---|
| 426 | |
---|
| 427 | /** |
---|
| 428 | * Reads a zero-compressed encoded long from a stream and return it. |
---|
| 429 | * @param in input stream |
---|
| 430 | * @throws java.io.IOException |
---|
| 431 | * @return deserialized long |
---|
| 432 | */ |
---|
| 433 | public static long readVLong(DataInput in) throws IOException { |
---|
| 434 | return WritableUtils.readVLong(in); |
---|
| 435 | } |
---|
| 436 | |
---|
| 437 | /** |
---|
| 438 | * Reads a zero-compressed encoded integer from a stream and returns it. |
---|
| 439 | * @param in input stream |
---|
| 440 | * @throws java.io.IOException |
---|
| 441 | * @return deserialized integer |
---|
| 442 | */ |
---|
| 443 | public static int readVInt(DataInput in) throws IOException { |
---|
| 444 | return WritableUtils.readVInt(in); |
---|
| 445 | } |
---|
| 446 | |
---|
| 447 | /** |
---|
| 448 | * Get the encoded length if an integer is stored in a variable-length format |
---|
| 449 | * @return the encoded length |
---|
| 450 | */ |
---|
| 451 | public static int getVIntSize(long i) { |
---|
| 452 | return WritableUtils.getVIntSize(i); |
---|
| 453 | } |
---|
| 454 | |
---|
| 455 | /** |
---|
| 456 | * Serializes a long to a binary stream with zero-compressed encoding. |
---|
| 457 | * For -112 <= i <= 127, only one byte is used with the actual value. |
---|
| 458 | * For other values of i, the first byte value indicates whether the |
---|
| 459 | * long is positive or negative, and the number of bytes that follow. |
---|
| 460 | * If the first byte value v is between -113 and -120, the following long |
---|
| 461 | * is positive, with number of bytes that follow are -(v+112). |
---|
| 462 | * If the first byte value v is between -121 and -128, the following long |
---|
| 463 | * is negative, with number of bytes that follow are -(v+120). Bytes are |
---|
| 464 | * stored in the high-non-zero-byte-first order. |
---|
| 465 | * |
---|
| 466 | * @param stream Binary output stream |
---|
| 467 | * @param i Long to be serialized |
---|
| 468 | * @throws java.io.IOException |
---|
| 469 | */ |
---|
| 470 | public static void writeVLong(DataOutput stream, long i) throws IOException { |
---|
| 471 | WritableUtils.writeVLong(stream, i); |
---|
| 472 | } |
---|
| 473 | |
---|
| 474 | /** |
---|
| 475 | * Serializes an int to a binary stream with zero-compressed encoding. |
---|
| 476 | * |
---|
| 477 | * @param stream Binary output stream |
---|
| 478 | * @param i int to be serialized |
---|
| 479 | * @throws java.io.IOException |
---|
| 480 | */ |
---|
| 481 | public static void writeVInt(DataOutput stream, int i) throws IOException { |
---|
| 482 | WritableUtils.writeVInt(stream, i); |
---|
| 483 | } |
---|
| 484 | |
---|
| 485 | /** Lexicographic order of binary data. */ |
---|
| 486 | public static int compareBytes(byte[] b1, int s1, int l1, |
---|
| 487 | byte[] b2, int s2, int l2) { |
---|
| 488 | return WritableComparator.compareBytes(b1, s1, l1, b2, s2, l2); |
---|
| 489 | } |
---|
| 490 | } |
---|