Shuyi Chen | d7955ce | 2013-05-22 14:51:55 -0700 | [diff] [blame] | 1 | // Copyright (c) 2003-2004 Brian Wellington (bwelling@xbill.org) |
| 2 | // |
| 3 | // Copyright (C) 2003-2004 Nominum, Inc. |
| 4 | // |
| 5 | // Permission to use, copy, modify, and distribute this software for any |
| 6 | // purpose with or without fee is hereby granted, provided that the above |
| 7 | // copyright notice and this permission notice appear in all copies. |
| 8 | // |
| 9 | // THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES |
| 10 | // WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
| 11 | // MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR ANY |
| 12 | // SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| 13 | // WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
| 14 | // ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT |
| 15 | // OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| 16 | // |
| 17 | |
| 18 | package org.xbill.DNS; |
| 19 | |
| 20 | import java.io.*; |
| 21 | import java.net.*; |
| 22 | |
| 23 | import org.xbill.DNS.utils.*; |
| 24 | |
| 25 | /** |
| 26 | * Tokenizer is used to parse DNS records and zones from text format, |
| 27 | * |
| 28 | * @author Brian Wellington |
| 29 | * @author Bob Halley |
| 30 | */ |
| 31 | |
| 32 | public class Tokenizer { |
| 33 | |
| 34 | private static String delim = " \t\n;()\""; |
| 35 | private static String quotes = "\""; |
| 36 | |
| 37 | /** End of file */ |
| 38 | public static final int EOF = 0; |
| 39 | |
| 40 | /** End of line */ |
| 41 | public static final int EOL = 1; |
| 42 | |
| 43 | /** Whitespace; only returned when wantWhitespace is set */ |
| 44 | public static final int WHITESPACE = 2; |
| 45 | |
| 46 | /** An identifier (unquoted string) */ |
| 47 | public static final int IDENTIFIER = 3; |
| 48 | |
| 49 | /** A quoted string */ |
| 50 | public static final int QUOTED_STRING = 4; |
| 51 | |
| 52 | /** A comment; only returned when wantComment is set */ |
| 53 | public static final int COMMENT = 5; |
| 54 | |
| 55 | private PushbackInputStream is; |
| 56 | private boolean ungottenToken; |
| 57 | private int multiline; |
| 58 | private boolean quoting; |
| 59 | private String delimiters; |
| 60 | private Token current; |
| 61 | private StringBuffer sb; |
| 62 | private boolean wantClose; |
| 63 | |
| 64 | private String filename; |
| 65 | private int line; |
| 66 | |
| 67 | public static class Token { |
| 68 | /** The type of token. */ |
| 69 | public int type; |
| 70 | |
| 71 | /** The value of the token, or null for tokens without values. */ |
| 72 | public String value; |
| 73 | |
| 74 | private |
| 75 | Token() { |
| 76 | type = -1; |
| 77 | value = null; |
| 78 | } |
| 79 | |
| 80 | private Token |
| 81 | set(int type, StringBuffer value) { |
| 82 | if (type < 0) |
| 83 | throw new IllegalArgumentException(); |
| 84 | this.type = type; |
| 85 | this.value = value == null ? null : value.toString(); |
| 86 | return this; |
| 87 | } |
| 88 | |
| 89 | /** |
| 90 | * Converts the token to a string containing a representation useful |
| 91 | * for debugging. |
| 92 | */ |
| 93 | public String |
| 94 | toString() { |
| 95 | switch (type) { |
| 96 | case EOF: |
| 97 | return "<eof>"; |
| 98 | case EOL: |
| 99 | return "<eol>"; |
| 100 | case WHITESPACE: |
| 101 | return "<whitespace>"; |
| 102 | case IDENTIFIER: |
| 103 | return "<identifier: " + value + ">"; |
| 104 | case QUOTED_STRING: |
| 105 | return "<quoted_string: " + value + ">"; |
| 106 | case COMMENT: |
| 107 | return "<comment: " + value + ">"; |
| 108 | default: |
| 109 | return "<unknown>"; |
| 110 | } |
| 111 | } |
| 112 | |
| 113 | /** Indicates whether this token contains a string. */ |
| 114 | public boolean |
| 115 | isString() { |
| 116 | return (type == IDENTIFIER || type == QUOTED_STRING); |
| 117 | } |
| 118 | |
| 119 | /** Indicates whether this token contains an EOL or EOF. */ |
| 120 | public boolean |
| 121 | isEOL() { |
| 122 | return (type == EOL || type == EOF); |
| 123 | } |
| 124 | } |
| 125 | |
| 126 | static class TokenizerException extends TextParseException { |
| 127 | String message; |
| 128 | |
| 129 | public |
| 130 | TokenizerException(String filename, int line, String message) { |
| 131 | super(filename + ":" + line + ": " + message); |
| 132 | this.message = message; |
| 133 | } |
| 134 | |
| 135 | public String |
| 136 | getBaseMessage() { |
| 137 | return message; |
| 138 | } |
| 139 | } |
| 140 | |
| 141 | /** |
| 142 | * Creates a Tokenizer from an arbitrary input stream. |
| 143 | * @param is The InputStream to tokenize. |
| 144 | */ |
| 145 | public |
| 146 | Tokenizer(InputStream is) { |
| 147 | if (!(is instanceof BufferedInputStream)) |
| 148 | is = new BufferedInputStream(is); |
| 149 | this.is = new PushbackInputStream(is, 2); |
| 150 | ungottenToken = false; |
| 151 | multiline = 0; |
| 152 | quoting = false; |
| 153 | delimiters = delim; |
| 154 | current = new Token(); |
| 155 | sb = new StringBuffer(); |
| 156 | filename = "<none>"; |
| 157 | line = 1; |
| 158 | } |
| 159 | |
| 160 | /** |
| 161 | * Creates a Tokenizer from a string. |
| 162 | * @param s The String to tokenize. |
| 163 | */ |
| 164 | public |
| 165 | Tokenizer(String s) { |
| 166 | this(new ByteArrayInputStream(s.getBytes())); |
| 167 | } |
| 168 | |
| 169 | /** |
| 170 | * Creates a Tokenizer from a file. |
| 171 | * @param f The File to tokenize. |
| 172 | */ |
| 173 | public |
| 174 | Tokenizer(File f) throws FileNotFoundException { |
| 175 | this(new FileInputStream(f)); |
| 176 | wantClose = true; |
| 177 | filename = f.getName(); |
| 178 | } |
| 179 | |
| 180 | private int |
| 181 | getChar() throws IOException { |
| 182 | int c = is.read(); |
| 183 | if (c == '\r') { |
| 184 | int next = is.read(); |
| 185 | if (next != '\n') |
| 186 | is.unread(next); |
| 187 | c = '\n'; |
| 188 | } |
| 189 | if (c == '\n') |
| 190 | line++; |
| 191 | return c; |
| 192 | } |
| 193 | |
| 194 | private void |
| 195 | ungetChar(int c) throws IOException { |
| 196 | if (c == -1) |
| 197 | return; |
| 198 | is.unread(c); |
| 199 | if (c == '\n') |
| 200 | line--; |
| 201 | } |
| 202 | |
| 203 | private int |
| 204 | skipWhitespace() throws IOException { |
| 205 | int skipped = 0; |
| 206 | while (true) { |
| 207 | int c = getChar(); |
| 208 | if (c != ' ' && c != '\t') { |
| 209 | if (!(c == '\n' && multiline > 0)) { |
| 210 | ungetChar(c); |
| 211 | return skipped; |
| 212 | } |
| 213 | } |
| 214 | skipped++; |
| 215 | } |
| 216 | } |
| 217 | |
| 218 | private void |
| 219 | checkUnbalancedParens() throws TextParseException { |
| 220 | if (multiline > 0) |
| 221 | throw exception("unbalanced parentheses"); |
| 222 | } |
| 223 | |
| 224 | /** |
| 225 | * Gets the next token from a tokenizer. |
| 226 | * @param wantWhitespace If true, leading whitespace will be returned as a |
| 227 | * token. |
| 228 | * @param wantComment If true, comments are returned as tokens. |
| 229 | * @return The next token in the stream. |
| 230 | * @throws TextParseException The input was invalid. |
| 231 | * @throws IOException An I/O error occurred. |
| 232 | */ |
| 233 | public Token |
| 234 | get(boolean wantWhitespace, boolean wantComment) throws IOException { |
| 235 | int type; |
| 236 | int c; |
| 237 | |
| 238 | if (ungottenToken) { |
| 239 | ungottenToken = false; |
| 240 | if (current.type == WHITESPACE) { |
| 241 | if (wantWhitespace) |
| 242 | return current; |
| 243 | } else if (current.type == COMMENT) { |
| 244 | if (wantComment) |
| 245 | return current; |
| 246 | } else { |
| 247 | if (current.type == EOL) |
| 248 | line++; |
| 249 | return current; |
| 250 | } |
| 251 | } |
| 252 | int skipped = skipWhitespace(); |
| 253 | if (skipped > 0 && wantWhitespace) |
| 254 | return current.set(WHITESPACE, null); |
| 255 | type = IDENTIFIER; |
| 256 | sb.setLength(0); |
| 257 | while (true) { |
| 258 | c = getChar(); |
| 259 | if (c == -1 || delimiters.indexOf(c) != -1) { |
| 260 | if (c == -1) { |
| 261 | if (quoting) |
| 262 | throw exception("EOF in " + |
| 263 | "quoted string"); |
| 264 | else if (sb.length() == 0) |
| 265 | return current.set(EOF, null); |
| 266 | else |
| 267 | return current.set(type, sb); |
| 268 | } |
| 269 | if (sb.length() == 0 && type != QUOTED_STRING) { |
| 270 | if (c == '(') { |
| 271 | multiline++; |
| 272 | skipWhitespace(); |
| 273 | continue; |
| 274 | } else if (c == ')') { |
| 275 | if (multiline <= 0) |
| 276 | throw exception("invalid " + |
| 277 | "close " + |
| 278 | "parenthesis"); |
| 279 | multiline--; |
| 280 | skipWhitespace(); |
| 281 | continue; |
| 282 | } else if (c == '"') { |
| 283 | if (!quoting) { |
| 284 | quoting = true; |
| 285 | delimiters = quotes; |
| 286 | type = QUOTED_STRING; |
| 287 | } else { |
| 288 | quoting = false; |
| 289 | delimiters = delim; |
| 290 | skipWhitespace(); |
| 291 | } |
| 292 | continue; |
| 293 | } else if (c == '\n') { |
| 294 | return current.set(EOL, null); |
| 295 | } else if (c == ';') { |
| 296 | while (true) { |
| 297 | c = getChar(); |
| 298 | if (c == '\n' || c == -1) |
| 299 | break; |
| 300 | sb.append((char)c); |
| 301 | } |
| 302 | if (wantComment) { |
| 303 | ungetChar(c); |
| 304 | return current.set(COMMENT, sb); |
| 305 | } else if (c == -1 && |
| 306 | type != QUOTED_STRING) |
| 307 | { |
| 308 | checkUnbalancedParens(); |
| 309 | return current.set(EOF, null); |
| 310 | } else if (multiline > 0) { |
| 311 | skipWhitespace(); |
| 312 | sb.setLength(0); |
| 313 | continue; |
| 314 | } else |
| 315 | return current.set(EOL, null); |
| 316 | } else |
| 317 | throw new IllegalStateException(); |
| 318 | } else |
| 319 | ungetChar(c); |
| 320 | break; |
| 321 | } else if (c == '\\') { |
| 322 | c = getChar(); |
| 323 | if (c == -1) |
| 324 | throw exception("unterminated escape sequence"); |
| 325 | sb.append('\\'); |
| 326 | } else if (quoting && c == '\n') { |
| 327 | throw exception("newline in quoted string"); |
| 328 | } |
| 329 | sb.append((char)c); |
| 330 | } |
| 331 | if (sb.length() == 0 && type != QUOTED_STRING) { |
| 332 | checkUnbalancedParens(); |
| 333 | return current.set(EOF, null); |
| 334 | } |
| 335 | return current.set(type, sb); |
| 336 | } |
| 337 | |
| 338 | /** |
| 339 | * Gets the next token from a tokenizer, ignoring whitespace and comments. |
| 340 | * @return The next token in the stream. |
| 341 | * @throws TextParseException The input was invalid. |
| 342 | * @throws IOException An I/O error occurred. |
| 343 | */ |
| 344 | public Token |
| 345 | get() throws IOException { |
| 346 | return get(false, false); |
| 347 | } |
| 348 | |
| 349 | /** |
| 350 | * Returns a token to the stream, so that it will be returned by the next call |
| 351 | * to get(). |
| 352 | * @throws IllegalStateException There are already ungotten tokens. |
| 353 | */ |
| 354 | public void |
| 355 | unget() { |
| 356 | if (ungottenToken) |
| 357 | throw new IllegalStateException |
| 358 | ("Cannot unget multiple tokens"); |
| 359 | if (current.type == EOL) |
| 360 | line--; |
| 361 | ungottenToken = true; |
| 362 | } |
| 363 | |
| 364 | /** |
| 365 | * Gets the next token from a tokenizer and converts it to a string. |
| 366 | * @return The next token in the stream, as a string. |
| 367 | * @throws TextParseException The input was invalid or not a string. |
| 368 | * @throws IOException An I/O error occurred. |
| 369 | */ |
| 370 | public String |
| 371 | getString() throws IOException { |
| 372 | Token next = get(); |
| 373 | if (!next.isString()) { |
| 374 | throw exception("expected a string"); |
| 375 | } |
| 376 | return next.value; |
| 377 | } |
| 378 | |
| 379 | private String |
| 380 | _getIdentifier(String expected) throws IOException { |
| 381 | Token next = get(); |
| 382 | if (next.type != IDENTIFIER) |
| 383 | throw exception("expected " + expected); |
| 384 | return next.value; |
| 385 | } |
| 386 | |
| 387 | /** |
| 388 | * Gets the next token from a tokenizer, ensures it is an unquoted string, |
| 389 | * and converts it to a string. |
| 390 | * @return The next token in the stream, as a string. |
| 391 | * @throws TextParseException The input was invalid or not an unquoted string. |
| 392 | * @throws IOException An I/O error occurred. |
| 393 | */ |
| 394 | public String |
| 395 | getIdentifier() throws IOException { |
| 396 | return _getIdentifier("an identifier"); |
| 397 | } |
| 398 | |
| 399 | /** |
| 400 | * Gets the next token from a tokenizer and converts it to a long. |
| 401 | * @return The next token in the stream, as a long. |
| 402 | * @throws TextParseException The input was invalid or not a long. |
| 403 | * @throws IOException An I/O error occurred. |
| 404 | */ |
| 405 | public long |
| 406 | getLong() throws IOException { |
| 407 | String next = _getIdentifier("an integer"); |
| 408 | if (!Character.isDigit(next.charAt(0))) |
| 409 | throw exception("expected an integer"); |
| 410 | try { |
| 411 | return Long.parseLong(next); |
| 412 | } catch (NumberFormatException e) { |
| 413 | throw exception("expected an integer"); |
| 414 | } |
| 415 | } |
| 416 | |
| 417 | /** |
| 418 | * Gets the next token from a tokenizer and converts it to an unsigned 32 bit |
| 419 | * integer. |
| 420 | * @return The next token in the stream, as an unsigned 32 bit integer. |
| 421 | * @throws TextParseException The input was invalid or not an unsigned 32 |
| 422 | * bit integer. |
| 423 | * @throws IOException An I/O error occurred. |
| 424 | */ |
| 425 | public long |
| 426 | getUInt32() throws IOException { |
| 427 | long l = getLong(); |
| 428 | if (l < 0 || l > 0xFFFFFFFFL) |
| 429 | throw exception("expected an 32 bit unsigned integer"); |
| 430 | return l; |
| 431 | } |
| 432 | |
| 433 | /** |
| 434 | * Gets the next token from a tokenizer and converts it to an unsigned 16 bit |
| 435 | * integer. |
| 436 | * @return The next token in the stream, as an unsigned 16 bit integer. |
| 437 | * @throws TextParseException The input was invalid or not an unsigned 16 |
| 438 | * bit integer. |
| 439 | * @throws IOException An I/O error occurred. |
| 440 | */ |
| 441 | public int |
| 442 | getUInt16() throws IOException { |
| 443 | long l = getLong(); |
| 444 | if (l < 0 || l > 0xFFFFL) |
| 445 | throw exception("expected an 16 bit unsigned integer"); |
| 446 | return (int) l; |
| 447 | } |
| 448 | |
| 449 | /** |
| 450 | * Gets the next token from a tokenizer and converts it to an unsigned 8 bit |
| 451 | * integer. |
| 452 | * @return The next token in the stream, as an unsigned 8 bit integer. |
| 453 | * @throws TextParseException The input was invalid or not an unsigned 8 |
| 454 | * bit integer. |
| 455 | * @throws IOException An I/O error occurred. |
| 456 | */ |
| 457 | public int |
| 458 | getUInt8() throws IOException { |
| 459 | long l = getLong(); |
| 460 | if (l < 0 || l > 0xFFL) |
| 461 | throw exception("expected an 8 bit unsigned integer"); |
| 462 | return (int) l; |
| 463 | } |
| 464 | |
| 465 | /** |
| 466 | * Gets the next token from a tokenizer and parses it as a TTL. |
| 467 | * @return The next token in the stream, as an unsigned 32 bit integer. |
| 468 | * @throws TextParseException The input was not valid. |
| 469 | * @throws IOException An I/O error occurred. |
| 470 | * @see TTL |
| 471 | */ |
| 472 | public long |
| 473 | getTTL() throws IOException { |
| 474 | String next = _getIdentifier("a TTL value"); |
| 475 | try { |
| 476 | return TTL.parseTTL(next); |
| 477 | } |
| 478 | catch (NumberFormatException e) { |
| 479 | throw exception("expected a TTL value"); |
| 480 | } |
| 481 | } |
| 482 | |
| 483 | /** |
| 484 | * Gets the next token from a tokenizer and parses it as if it were a TTL. |
| 485 | * @return The next token in the stream, as an unsigned 32 bit integer. |
| 486 | * @throws TextParseException The input was not valid. |
| 487 | * @throws IOException An I/O error occurred. |
| 488 | * @see TTL |
| 489 | */ |
| 490 | public long |
| 491 | getTTLLike() throws IOException { |
| 492 | String next = _getIdentifier("a TTL-like value"); |
| 493 | try { |
| 494 | return TTL.parse(next, false); |
| 495 | } |
| 496 | catch (NumberFormatException e) { |
| 497 | throw exception("expected a TTL-like value"); |
| 498 | } |
| 499 | } |
| 500 | |
| 501 | /** |
| 502 | * Gets the next token from a tokenizer and converts it to a name. |
| 503 | * @param origin The origin to append to relative names. |
| 504 | * @return The next token in the stream, as a name. |
| 505 | * @throws TextParseException The input was invalid or not a valid name. |
| 506 | * @throws IOException An I/O error occurred. |
| 507 | * @throws RelativeNameException The parsed name was relative, even with the |
| 508 | * origin. |
| 509 | * @see Name |
| 510 | */ |
| 511 | public Name |
| 512 | getName(Name origin) throws IOException { |
| 513 | String next = _getIdentifier("a name"); |
| 514 | try { |
| 515 | Name name = Name.fromString(next, origin); |
| 516 | if (!name.isAbsolute()) |
| 517 | throw new RelativeNameException(name); |
| 518 | return name; |
| 519 | } |
| 520 | catch (TextParseException e) { |
| 521 | throw exception(e.getMessage()); |
| 522 | } |
| 523 | } |
| 524 | |
| 525 | /** |
| 526 | * Gets the next token from a tokenizer and converts it to an IP Address. |
| 527 | * @param family The address family. |
| 528 | * @return The next token in the stream, as an InetAddress |
| 529 | * @throws TextParseException The input was invalid or not a valid address. |
| 530 | * @throws IOException An I/O error occurred. |
| 531 | * @see Address |
| 532 | */ |
| 533 | public InetAddress |
| 534 | getAddress(int family) throws IOException { |
| 535 | String next = _getIdentifier("an address"); |
| 536 | try { |
| 537 | return Address.getByAddress(next, family); |
| 538 | } |
| 539 | catch (UnknownHostException e) { |
| 540 | throw exception(e.getMessage()); |
| 541 | } |
| 542 | } |
| 543 | |
| 544 | /** |
| 545 | * Gets the next token from a tokenizer, which must be an EOL or EOF. |
| 546 | * @throws TextParseException The input was invalid or not an EOL or EOF token. |
| 547 | * @throws IOException An I/O error occurred. |
| 548 | */ |
| 549 | public void |
| 550 | getEOL() throws IOException { |
| 551 | Token next = get(); |
| 552 | if (next.type != EOL && next.type != EOF) { |
| 553 | throw exception("expected EOL or EOF"); |
| 554 | } |
| 555 | } |
| 556 | |
| 557 | /** |
| 558 | * Returns a concatenation of the remaining strings from a Tokenizer. |
| 559 | */ |
| 560 | private String |
| 561 | remainingStrings() throws IOException { |
| 562 | StringBuffer buffer = null; |
| 563 | while (true) { |
| 564 | Tokenizer.Token t = get(); |
| 565 | if (!t.isString()) |
| 566 | break; |
| 567 | if (buffer == null) |
| 568 | buffer = new StringBuffer(); |
| 569 | buffer.append(t.value); |
| 570 | } |
| 571 | unget(); |
| 572 | if (buffer == null) |
| 573 | return null; |
| 574 | return buffer.toString(); |
| 575 | } |
| 576 | |
| 577 | /** |
| 578 | * Gets the remaining string tokens until an EOL/EOF is seen, concatenates |
| 579 | * them together, and converts the base64 encoded data to a byte array. |
| 580 | * @param required If true, an exception will be thrown if no strings remain; |
| 581 | * otherwise null be be returned. |
| 582 | * @return The byte array containing the decoded strings, or null if there |
| 583 | * were no strings to decode. |
| 584 | * @throws TextParseException The input was invalid. |
| 585 | * @throws IOException An I/O error occurred. |
| 586 | */ |
| 587 | public byte [] |
| 588 | getBase64(boolean required) throws IOException { |
| 589 | String s = remainingStrings(); |
| 590 | if (s == null) { |
| 591 | if (required) |
| 592 | throw exception("expected base64 encoded string"); |
| 593 | else |
| 594 | return null; |
| 595 | } |
| 596 | byte [] array = base64.fromString(s); |
| 597 | if (array == null) |
| 598 | throw exception("invalid base64 encoding"); |
| 599 | return array; |
| 600 | } |
| 601 | |
| 602 | /** |
| 603 | * Gets the remaining string tokens until an EOL/EOF is seen, concatenates |
| 604 | * them together, and converts the base64 encoded data to a byte array. |
| 605 | * @return The byte array containing the decoded strings, or null if there |
| 606 | * were no strings to decode. |
| 607 | * @throws TextParseException The input was invalid. |
| 608 | * @throws IOException An I/O error occurred. |
| 609 | */ |
| 610 | public byte [] |
| 611 | getBase64() throws IOException { |
| 612 | return getBase64(false); |
| 613 | } |
| 614 | |
| 615 | /** |
| 616 | * Gets the remaining string tokens until an EOL/EOF is seen, concatenates |
| 617 | * them together, and converts the hex encoded data to a byte array. |
| 618 | * @param required If true, an exception will be thrown if no strings remain; |
| 619 | * otherwise null be be returned. |
| 620 | * @return The byte array containing the decoded strings, or null if there |
| 621 | * were no strings to decode. |
| 622 | * @throws TextParseException The input was invalid. |
| 623 | * @throws IOException An I/O error occurred. |
| 624 | */ |
| 625 | public byte [] |
| 626 | getHex(boolean required) throws IOException { |
| 627 | String s = remainingStrings(); |
| 628 | if (s == null) { |
| 629 | if (required) |
| 630 | throw exception("expected hex encoded string"); |
| 631 | else |
| 632 | return null; |
| 633 | } |
| 634 | byte [] array = base16.fromString(s); |
| 635 | if (array == null) |
| 636 | throw exception("invalid hex encoding"); |
| 637 | return array; |
| 638 | } |
| 639 | |
| 640 | /** |
| 641 | * Gets the remaining string tokens until an EOL/EOF is seen, concatenates |
| 642 | * them together, and converts the hex encoded data to a byte array. |
| 643 | * @return The byte array containing the decoded strings, or null if there |
| 644 | * were no strings to decode. |
| 645 | * @throws TextParseException The input was invalid. |
| 646 | * @throws IOException An I/O error occurred. |
| 647 | */ |
| 648 | public byte [] |
| 649 | getHex() throws IOException { |
| 650 | return getHex(false); |
| 651 | } |
| 652 | |
| 653 | /** |
| 654 | * Gets the next token from a tokenizer and decodes it as hex. |
| 655 | * @return The byte array containing the decoded string. |
| 656 | * @throws TextParseException The input was invalid. |
| 657 | * @throws IOException An I/O error occurred. |
| 658 | */ |
| 659 | public byte [] |
| 660 | getHexString() throws IOException { |
| 661 | String next = _getIdentifier("a hex string"); |
| 662 | byte [] array = base16.fromString(next); |
| 663 | if (array == null) |
| 664 | throw exception("invalid hex encoding"); |
| 665 | return array; |
| 666 | } |
| 667 | |
| 668 | /** |
| 669 | * Gets the next token from a tokenizer and decodes it as base32. |
| 670 | * @param b32 The base32 context to decode with. |
| 671 | * @return The byte array containing the decoded string. |
| 672 | * @throws TextParseException The input was invalid. |
| 673 | * @throws IOException An I/O error occurred. |
| 674 | */ |
| 675 | public byte [] |
| 676 | getBase32String(base32 b32) throws IOException { |
| 677 | String next = _getIdentifier("a base32 string"); |
| 678 | byte [] array = b32.fromString(next); |
| 679 | if (array == null) |
| 680 | throw exception("invalid base32 encoding"); |
| 681 | return array; |
| 682 | } |
| 683 | |
| 684 | /** |
| 685 | * Creates an exception which includes the current state in the error message |
| 686 | * @param s The error message to include. |
| 687 | * @return The exception to be thrown |
| 688 | */ |
| 689 | public TextParseException |
| 690 | exception(String s) { |
| 691 | return new TokenizerException(filename, line, s); |
| 692 | } |
| 693 | |
| 694 | /** |
| 695 | * Closes any files opened by this tokenizer. |
| 696 | */ |
| 697 | public void |
| 698 | close() { |
| 699 | if (wantClose) { |
| 700 | try { |
| 701 | is.close(); |
| 702 | } |
| 703 | catch (IOException e) { |
| 704 | } |
| 705 | } |
| 706 | } |
| 707 | |
| 708 | protected void |
| 709 | finalize() { |
| 710 | close(); |
| 711 | } |
| 712 | |
| 713 | } |