J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun in the LICENSE file that accompanied this code. |
| 10 | * |
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| 15 | * accompanied this code). |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License version |
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | |
| 27 | package com.sun.jmx.snmp; |
| 28 | |
| 29 | |
| 30 | |
| 31 | |
| 32 | /** |
| 33 | * The <CODE>BerDecoder</CODE> class is used for decoding |
| 34 | * BER-encoded data. |
| 35 | * |
| 36 | * A <CODE>BerDecoder</CODE> needs to be set up with the byte string containing |
| 37 | * the encoding. It maintains a current position in the byte string. |
| 38 | * |
| 39 | * Methods allows to fetch integer, string, OID, etc., from the current |
| 40 | * position. After a fetch the current position is moved forward. |
| 41 | * |
| 42 | * A fetch throws a <CODE>BerException</CODE> if the encoding is not of the |
| 43 | * expected type. |
| 44 | * |
| 45 | * <p><b>This API is a Sun Microsystems internal API and is subject |
| 46 | * to change without notice.</b></p> |
| 47 | * |
| 48 | * @since 1.5 |
| 49 | */ |
| 50 | |
| 51 | public class BerDecoder { |
| 52 | |
| 53 | /** |
| 54 | * Constructs a new decoder and attaches it to the specified byte string. |
| 55 | * |
| 56 | * @param b The byte string containing the encoded data. |
| 57 | */ |
| 58 | |
| 59 | public BerDecoder(byte b[]) { |
| 60 | bytes = b ; |
| 61 | reset() ; |
| 62 | } |
| 63 | |
| 64 | public void reset() { |
| 65 | next = 0 ; |
| 66 | stackTop = 0 ; |
| 67 | } |
| 68 | |
| 69 | /** |
| 70 | * Fetch an integer. |
| 71 | * |
| 72 | * @return The decoded integer. |
| 73 | * |
| 74 | * @exception BerException Current position does not point to an integer. |
| 75 | */ |
| 76 | |
| 77 | public int fetchInteger() throws BerException { |
| 78 | return fetchInteger(IntegerTag) ; |
| 79 | } |
| 80 | |
| 81 | |
| 82 | /** |
| 83 | * Fetch an integer with the specified tag. |
| 84 | * |
| 85 | * @param tag The expected tag. |
| 86 | * |
| 87 | * @return The decoded integer. |
| 88 | * |
| 89 | * @exception BerException Current position does not point to an integer |
| 90 | * or the tag is not the expected one. |
| 91 | */ |
| 92 | |
| 93 | public int fetchInteger(int tag) throws BerException { |
| 94 | int result = 0 ; |
| 95 | final int backup = next ; |
| 96 | try { |
| 97 | if (fetchTag() != tag) { |
| 98 | throw new BerException() ; |
| 99 | } |
| 100 | result = fetchIntegerValue() ; |
| 101 | } |
| 102 | catch(BerException e) { |
| 103 | next = backup ; |
| 104 | throw e ; |
| 105 | } |
| 106 | |
| 107 | return result ; |
| 108 | } |
| 109 | |
| 110 | |
| 111 | |
| 112 | /** |
| 113 | * Fetch an integer and return a long value. |
| 114 | * |
| 115 | * @return The decoded integer. |
| 116 | * |
| 117 | * @exception BerException Current position does not point to an integer. |
| 118 | */ |
| 119 | |
| 120 | public long fetchIntegerAsLong() throws BerException { |
| 121 | return fetchIntegerAsLong(IntegerTag) ; |
| 122 | } |
| 123 | |
| 124 | |
| 125 | /** |
| 126 | * Fetch an integer with the specified tag and return a long value. |
| 127 | * |
| 128 | * @param tag The expected tag. |
| 129 | * |
| 130 | * @return The decoded integer. |
| 131 | * |
| 132 | * @exception BerException Current position does not point to an integer |
| 133 | * or the tag is not the expected one. |
| 134 | */ |
| 135 | |
| 136 | public long fetchIntegerAsLong(int tag) throws BerException { |
| 137 | long result = 0 ; |
| 138 | final int backup = next ; |
| 139 | try { |
| 140 | if (fetchTag() != tag) { |
| 141 | throw new BerException() ; |
| 142 | } |
| 143 | result = fetchIntegerValueAsLong() ; |
| 144 | } |
| 145 | catch(BerException e) { |
| 146 | next = backup ; |
| 147 | throw e ; |
| 148 | } |
| 149 | |
| 150 | return result ; |
| 151 | } |
| 152 | |
| 153 | |
| 154 | |
| 155 | /** |
| 156 | * Fetch an octet string. |
| 157 | * |
| 158 | * @return The decoded string. |
| 159 | * |
| 160 | * @exception BerException Current position does not point to an octet string. |
| 161 | */ |
| 162 | |
| 163 | public byte[] fetchOctetString() throws BerException { |
| 164 | return fetchOctetString(OctetStringTag) ; |
| 165 | } |
| 166 | |
| 167 | |
| 168 | /** |
| 169 | * Fetch an octet string with a specified tag. |
| 170 | * |
| 171 | * @param tag The expected tag. |
| 172 | * |
| 173 | * @return The decoded string. |
| 174 | * |
| 175 | * @exception BerException Current position does not point to an octet string |
| 176 | * or the tag is not the expected one. |
| 177 | */ |
| 178 | |
| 179 | public byte[] fetchOctetString(int tag) throws BerException { |
| 180 | byte[] result = null ; |
| 181 | final int backup = next ; |
| 182 | try { |
| 183 | if (fetchTag() != tag) { |
| 184 | throw new BerException() ; |
| 185 | } |
| 186 | result = fetchStringValue() ; |
| 187 | } |
| 188 | catch(BerException e) { |
| 189 | next = backup ; |
| 190 | throw e ; |
| 191 | } |
| 192 | |
| 193 | return result ; |
| 194 | } |
| 195 | |
| 196 | |
| 197 | /** |
| 198 | * Fetch an object identifier. |
| 199 | * |
| 200 | * @return The decoded object identifier as an array of long. |
| 201 | */ |
| 202 | |
| 203 | public long[] fetchOid() throws BerException { |
| 204 | return fetchOid(OidTag) ; |
| 205 | } |
| 206 | |
| 207 | |
| 208 | /** |
| 209 | * Fetch an object identifier with a specified tag. |
| 210 | * |
| 211 | * @param tag The expected tag. |
| 212 | * |
| 213 | * @return The decoded object identifier as an array of long. |
| 214 | * |
| 215 | * @exception BerException Current position does not point to an oid |
| 216 | * or the tag is not the expected one. |
| 217 | */ |
| 218 | |
| 219 | public long[] fetchOid(int tag) throws BerException { |
| 220 | long[] result = null ; |
| 221 | final int backup = next ; |
| 222 | try { |
| 223 | if (fetchTag() != tag) { |
| 224 | throw new BerException() ; |
| 225 | } |
| 226 | result = fetchOidValue() ; |
| 227 | } |
| 228 | catch(BerException e) { |
| 229 | next = backup ; |
| 230 | throw e ; |
| 231 | } |
| 232 | |
| 233 | return result ; |
| 234 | } |
| 235 | |
| 236 | |
| 237 | /** |
| 238 | * Fetch a <CODE>NULL</CODE> value. |
| 239 | * |
| 240 | * @exception BerException Current position does not point to <CODE>NULL</CODE> value. |
| 241 | */ |
| 242 | |
| 243 | public void fetchNull() throws BerException { |
| 244 | fetchNull(NullTag) ; |
| 245 | } |
| 246 | |
| 247 | |
| 248 | /** |
| 249 | * Fetch a <CODE>NULL</CODE> value with a specified tag. |
| 250 | * |
| 251 | * @param tag The expected tag. |
| 252 | * |
| 253 | * @exception BerException Current position does not point to |
| 254 | * <CODE>NULL</CODE> value or the tag is not the expected one. |
| 255 | */ |
| 256 | |
| 257 | public void fetchNull(int tag) throws BerException { |
| 258 | final int backup = next ; |
| 259 | try { |
| 260 | if (fetchTag() != tag) { |
| 261 | throw new BerException() ; |
| 262 | } |
| 263 | final int length = fetchLength(); |
| 264 | if (length != 0) throw new BerException(); |
| 265 | } |
| 266 | catch(BerException e) { |
| 267 | next = backup ; |
| 268 | throw e ; |
| 269 | } |
| 270 | } |
| 271 | |
| 272 | |
| 273 | |
| 274 | /** |
| 275 | * Fetch an <CODE>ANY</CODE> value. In fact, this method does not decode anything |
| 276 | * it simply returns the next TLV as an array of bytes. |
| 277 | * |
| 278 | * @return The TLV as a byte array. |
| 279 | * |
| 280 | * @exception BerException The next TLV is really badly encoded... |
| 281 | */ |
| 282 | |
| 283 | public byte[] fetchAny() throws BerException { |
| 284 | byte[] result = null ; |
| 285 | final int backup = next ; |
| 286 | try { |
| 287 | final int tag = fetchTag() ; |
| 288 | final int contentLength = fetchLength() ; |
| 289 | if (contentLength < 0) throw new BerException() ; |
| 290 | final int tlvLength = next + contentLength - backup ; |
| 291 | if (contentLength > (bytes.length - next)) |
| 292 | throw new IndexOutOfBoundsException("Decoded length exceeds buffer"); |
| 293 | final byte[] data = new byte[tlvLength] ; |
| 294 | java.lang.System.arraycopy(bytes,backup,data,0,tlvLength); |
| 295 | // for (int i = 0 ; i < tlvLength ; i++) { |
| 296 | // data[i] = bytes[backup + i] ; |
| 297 | // } |
| 298 | next = next + contentLength ; |
| 299 | result = data; |
| 300 | } |
| 301 | catch(IndexOutOfBoundsException e) { |
| 302 | next = backup ; |
| 303 | throw new BerException() ; |
| 304 | } |
| 305 | // catch(Error e) { |
| 306 | // debug("fetchAny: Error decoding BER: " + e); |
| 307 | // throw e; |
| 308 | // } |
| 309 | |
| 310 | return result ; |
| 311 | } |
| 312 | |
| 313 | |
| 314 | /** |
| 315 | * Fetch an <CODE>ANY</CODE> value with a specific tag. |
| 316 | * |
| 317 | * @param tag The expected tag. |
| 318 | * |
| 319 | * @return The TLV as a byte array. |
| 320 | * |
| 321 | * @exception BerException The next TLV is really badly encoded... |
| 322 | */ |
| 323 | |
| 324 | public byte[] fetchAny(int tag) throws BerException { |
| 325 | if (getTag() != tag) { |
| 326 | throw new BerException() ; |
| 327 | } |
| 328 | return fetchAny() ; |
| 329 | } |
| 330 | |
| 331 | |
| 332 | |
| 333 | /** |
| 334 | * Fetch a sequence header. |
| 335 | * The decoder computes the end position of the sequence and push it |
| 336 | * on its stack. |
| 337 | * |
| 338 | * @exception BerException Current position does not point to a sequence header. |
| 339 | */ |
| 340 | |
| 341 | public void openSequence() throws BerException { |
| 342 | openSequence(SequenceTag) ; |
| 343 | } |
| 344 | |
| 345 | |
| 346 | /** |
| 347 | * Fetch a sequence header with a specific tag. |
| 348 | * |
| 349 | * @param tag The expected tag. |
| 350 | * |
| 351 | * @exception BerException Current position does not point to a sequence header |
| 352 | * or the tag is not the expected one. |
| 353 | */ |
| 354 | |
| 355 | public void openSequence(int tag) throws BerException { |
| 356 | final int backup = next ; |
| 357 | try { |
| 358 | if (fetchTag() != tag) { |
| 359 | throw new BerException() ; |
| 360 | } |
| 361 | final int l = fetchLength() ; |
| 362 | if (l < 0) throw new BerException(); |
| 363 | if (l > (bytes.length - next)) throw new BerException(); |
| 364 | stackBuf[stackTop++] = next + l ; |
| 365 | } |
| 366 | catch(BerException e) { |
| 367 | next = backup ; |
| 368 | throw e ; |
| 369 | } |
| 370 | } |
| 371 | |
| 372 | |
| 373 | /** |
| 374 | * Close a sequence. |
| 375 | * The decode pull the stack and verifies that the current position |
| 376 | * matches with the calculated end of the sequence. If not it throws |
| 377 | * an exception. |
| 378 | * |
| 379 | * @exception BerException The sequence is not expected to finish here. |
| 380 | */ |
| 381 | |
| 382 | public void closeSequence() throws BerException { |
| 383 | if (stackBuf[stackTop - 1] == next) { |
| 384 | stackTop-- ; |
| 385 | } |
| 386 | else { |
| 387 | throw new BerException() ; |
| 388 | } |
| 389 | } |
| 390 | |
| 391 | |
| 392 | /** |
| 393 | * Return <CODE>true</CODE> if the end of the current sequence is not reached. |
| 394 | * When this method returns <CODE>false</CODE>, <CODE>closeSequence</CODE> can (and must) be |
| 395 | * invoked. |
| 396 | * |
| 397 | * @return <CODE>true</CODE> if there is still some data in the sequence. |
| 398 | */ |
| 399 | |
| 400 | public boolean cannotCloseSequence() { |
| 401 | return (next < stackBuf[stackTop - 1]) ; |
| 402 | } |
| 403 | |
| 404 | |
| 405 | /** |
| 406 | * Get the tag of the data at the current position. |
| 407 | * Current position is unchanged. |
| 408 | * |
| 409 | * @return The next tag. |
| 410 | */ |
| 411 | |
| 412 | public int getTag() throws BerException { |
| 413 | int result = 0 ; |
| 414 | final int backup = next ; |
| 415 | try { |
| 416 | result = fetchTag() ; |
| 417 | } |
| 418 | finally { |
| 419 | next = backup ; |
| 420 | } |
| 421 | |
| 422 | return result ; |
| 423 | } |
| 424 | |
| 425 | |
| 426 | |
| 427 | public String toString() { |
| 428 | final StringBuffer result = new StringBuffer(bytes.length * 2) ; |
| 429 | for (int i = 0 ; i < bytes.length ; i++) { |
| 430 | final int b = (bytes[i] > 0) ? bytes[i] : bytes[i] + 256 ; |
| 431 | if (i == next) { |
| 432 | result.append("(") ; |
| 433 | } |
| 434 | result.append(Character.forDigit(b / 16, 16)) ; |
| 435 | result.append(Character.forDigit(b % 16, 16)) ; |
| 436 | if (i == next) { |
| 437 | result.append(")") ; |
| 438 | } |
| 439 | } |
| 440 | if (bytes.length == next) { |
| 441 | result.append("()") ; |
| 442 | } |
| 443 | |
| 444 | return new String(result) ; |
| 445 | } |
| 446 | |
| 447 | |
| 448 | // |
| 449 | // Some standard tags |
| 450 | // |
| 451 | public final static int BooleanTag = 1 ; |
| 452 | public final static int IntegerTag = 2 ; |
| 453 | public final static int OctetStringTag = 4 ; |
| 454 | public final static int NullTag = 5 ; |
| 455 | public final static int OidTag = 6 ; |
| 456 | public final static int SequenceTag = 0x30 ; |
| 457 | |
| 458 | |
| 459 | |
| 460 | |
| 461 | ////////////////////////// PRIVATE /////////////////////////////// |
| 462 | |
| 463 | |
| 464 | |
| 465 | /** |
| 466 | * Fetch a tag and move the current position forward. |
| 467 | * |
| 468 | * @return The tag |
| 469 | */ |
| 470 | |
| 471 | private final int fetchTag() throws BerException { |
| 472 | int result = 0 ; |
| 473 | final int backup = next ; |
| 474 | |
| 475 | try { |
| 476 | final byte b0 = bytes[next++] ; |
| 477 | result = (b0 >= 0) ? b0 : b0 + 256 ; |
| 478 | if ((result & 31) == 31) { |
| 479 | while ((bytes[next] & 128) != 0) { |
| 480 | result = result << 7 ; |
| 481 | result = result | (bytes[next++] & 127); |
| 482 | } |
| 483 | } |
| 484 | } |
| 485 | catch(IndexOutOfBoundsException e) { |
| 486 | next = backup ; |
| 487 | throw new BerException() ; |
| 488 | } |
| 489 | |
| 490 | return result ; |
| 491 | } |
| 492 | |
| 493 | |
| 494 | /** |
| 495 | * Fetch a length and move the current position forward. |
| 496 | * |
| 497 | * @return The length |
| 498 | */ |
| 499 | |
| 500 | private final int fetchLength() throws BerException { |
| 501 | int result = 0 ; |
| 502 | final int backup = next ; |
| 503 | |
| 504 | try { |
| 505 | final byte b0 = bytes[next++] ; |
| 506 | if (b0 >= 0) { |
| 507 | result = b0 ; |
| 508 | } |
| 509 | else { |
| 510 | for (int c = 128 + b0 ; c > 0 ; c--) { |
| 511 | final byte bX = bytes[next++] ; |
| 512 | result = result << 8 ; |
| 513 | result = result | ((bX >= 0) ? bX : bX+256) ; |
| 514 | } |
| 515 | } |
| 516 | } |
| 517 | catch(IndexOutOfBoundsException e) { |
| 518 | next = backup ; |
| 519 | throw new BerException() ; |
| 520 | } |
| 521 | |
| 522 | return result ; |
| 523 | } |
| 524 | |
| 525 | |
| 526 | /** |
| 527 | * Fetch an integer value and move the current position forward. |
| 528 | * |
| 529 | * @return The integer |
| 530 | */ |
| 531 | |
| 532 | private int fetchIntegerValue() throws BerException { |
| 533 | int result = 0 ; |
| 534 | final int backup = next ; |
| 535 | |
| 536 | try { |
| 537 | final int length = fetchLength() ; |
| 538 | if (length <= 0) throw new BerException() ; |
| 539 | if (length > (bytes.length - next)) throw |
| 540 | new IndexOutOfBoundsException("Decoded length exceeds buffer"); |
| 541 | final int end = next + length ; |
| 542 | result = bytes[next++] ; |
| 543 | while (next < end) { |
| 544 | final byte b = bytes[next++] ; |
| 545 | if (b < 0) { |
| 546 | result = (result << 8) | (256 + b) ; |
| 547 | } |
| 548 | else { |
| 549 | result = (result << 8) | b ; |
| 550 | } |
| 551 | } |
| 552 | } |
| 553 | catch(BerException e) { |
| 554 | next = backup ; |
| 555 | throw e ; |
| 556 | } |
| 557 | catch(IndexOutOfBoundsException e) { |
| 558 | next = backup ; |
| 559 | throw new BerException() ; |
| 560 | } |
| 561 | catch(ArithmeticException e) { |
| 562 | next = backup ; |
| 563 | throw new BerException() ; |
| 564 | } |
| 565 | return result ; |
| 566 | } |
| 567 | |
| 568 | |
| 569 | /** |
| 570 | * Fetch an integer value and return a long value. |
| 571 | * FIX ME: someday we could have only on fetchIntegerValue() which always |
| 572 | * returns a long value. |
| 573 | * |
| 574 | * @return The integer |
| 575 | */ |
| 576 | |
| 577 | private final long fetchIntegerValueAsLong() throws BerException { |
| 578 | long result = 0 ; |
| 579 | final int backup = next ; |
| 580 | |
| 581 | try { |
| 582 | final int length = fetchLength() ; |
| 583 | if (length <= 0) throw new BerException() ; |
| 584 | if (length > (bytes.length - next)) throw |
| 585 | new IndexOutOfBoundsException("Decoded length exceeds buffer"); |
| 586 | |
| 587 | final int end = next + length ; |
| 588 | result = bytes[next++] ; |
| 589 | while (next < end) { |
| 590 | final byte b = bytes[next++] ; |
| 591 | if (b < 0) { |
| 592 | result = (result << 8) | (256 + b) ; |
| 593 | } |
| 594 | else { |
| 595 | result = (result << 8) | b ; |
| 596 | } |
| 597 | } |
| 598 | } |
| 599 | catch(BerException e) { |
| 600 | next = backup ; |
| 601 | throw e ; |
| 602 | } |
| 603 | catch(IndexOutOfBoundsException e) { |
| 604 | next = backup ; |
| 605 | throw new BerException() ; |
| 606 | } |
| 607 | catch(ArithmeticException e) { |
| 608 | next = backup ; |
| 609 | throw new BerException() ; |
| 610 | } |
| 611 | return result ; |
| 612 | } |
| 613 | |
| 614 | |
| 615 | /** |
| 616 | * Fetch a byte string and move the current position forward. |
| 617 | * |
| 618 | * @return The byte string |
| 619 | */ |
| 620 | |
| 621 | private byte[] fetchStringValue() throws BerException { |
| 622 | byte[] result = null ; |
| 623 | final int backup = next ; |
| 624 | |
| 625 | try { |
| 626 | final int length = fetchLength() ; |
| 627 | if (length < 0) throw new BerException() ; |
| 628 | if (length > (bytes.length - next)) |
| 629 | throw new IndexOutOfBoundsException("Decoded length exceeds buffer"); |
| 630 | final byte data[] = new byte[length] ; |
| 631 | java.lang.System.arraycopy(bytes,next,data,0,length); |
| 632 | next += length; |
| 633 | // int i = 0 ; |
| 634 | // while (i < length) { |
| 635 | // result[i++] = bytes[next++] ; |
| 636 | // } |
| 637 | result = data; |
| 638 | } |
| 639 | catch(BerException e) { |
| 640 | next = backup ; |
| 641 | throw e ; |
| 642 | } |
| 643 | catch(IndexOutOfBoundsException e) { |
| 644 | next = backup ; |
| 645 | throw new BerException() ; |
| 646 | } |
| 647 | catch(ArithmeticException e) { |
| 648 | next = backup ; |
| 649 | throw new BerException() ; |
| 650 | } |
| 651 | // catch(Error e) { |
| 652 | // debug("fetchStringValue: Error decoding BER: " + e); |
| 653 | // throw e; |
| 654 | // } |
| 655 | |
| 656 | return result ; |
| 657 | } |
| 658 | |
| 659 | |
| 660 | |
| 661 | /** |
| 662 | * Fetch an oid and move the current position forward. |
| 663 | * |
| 664 | * @return The oid |
| 665 | */ |
| 666 | |
| 667 | private final long[] fetchOidValue() throws BerException { |
| 668 | long[] result = null ; |
| 669 | final int backup = next ; |
| 670 | |
| 671 | try { |
| 672 | final int length = fetchLength() ; |
| 673 | if (length <= 0) throw new BerException() ; |
| 674 | if (length > (bytes.length - next)) |
| 675 | throw new IndexOutOfBoundsException("Decoded length exceeds buffer"); |
| 676 | // Count how many bytes have their 8th bit to 0 |
| 677 | // -> this gives the number of components in the oid |
| 678 | int subidCount = 2 ; |
| 679 | for (int i = 1 ; i < length ; i++) { |
| 680 | if ((bytes[next + i] & 0x80) == 0) { |
| 681 | subidCount++ ; |
| 682 | } |
| 683 | } |
| 684 | final int datalen = subidCount; |
| 685 | final long[] data = new long[datalen]; |
| 686 | final byte b0 = bytes[next++] ; |
| 687 | |
| 688 | // bugId 4641746 |
| 689 | // The 8th bit of the first byte should always be set to 0 |
| 690 | if (b0 < 0) throw new BerException(); |
| 691 | |
| 692 | // bugId 4641746 |
| 693 | // The first sub Id cannot be greater than 2 |
| 694 | final long lb0 = b0 / 40 ; |
| 695 | if (lb0 > 2) throw new BerException(); |
| 696 | |
| 697 | final long lb1 = b0 % 40; |
| 698 | data[0] = lb0 ; |
| 699 | data[1] = lb1 ; |
| 700 | int i = 2 ; |
| 701 | while (i < datalen) { |
| 702 | long subid = 0 ; |
| 703 | byte b = bytes[next++] ; |
| 704 | while ((b & 0x80) != 0) { |
| 705 | subid = (subid << 7) | (b & 0x7f) ; |
| 706 | // bugId 4654674 |
| 707 | if (subid < 0) throw new BerException(); |
| 708 | b = bytes[next++] ; |
| 709 | } |
| 710 | subid = (subid << 7) | b ; |
| 711 | // bugId 4654674 |
| 712 | if (subid < 0) throw new BerException(); |
| 713 | data[i++] = subid ; |
| 714 | } |
| 715 | result = data; |
| 716 | } |
| 717 | catch(BerException e) { |
| 718 | next = backup ; |
| 719 | throw e ; |
| 720 | } |
| 721 | catch(IndexOutOfBoundsException e) { |
| 722 | next = backup ; |
| 723 | throw new BerException() ; |
| 724 | } |
| 725 | // catch(Error e) { |
| 726 | // debug("fetchOidValue: Error decoding BER: " + e); |
| 727 | // throw e; |
| 728 | // } |
| 729 | |
| 730 | return result ; |
| 731 | } |
| 732 | |
| 733 | // private static final void debug(String str) { |
| 734 | // System.out.println(str); |
| 735 | // } |
| 736 | |
| 737 | // |
| 738 | // This is the byte array containing the encoding. |
| 739 | // |
| 740 | private final byte bytes[]; |
| 741 | |
| 742 | // |
| 743 | // This is the current location. It is the next byte |
| 744 | // to be decoded. It's an index in bytes[]. |
| 745 | // |
| 746 | private int next = 0 ; |
| 747 | |
| 748 | // |
| 749 | // This is the stack where end of sequences are kept. |
| 750 | // A value is computed and pushed in it each time openSequence() |
| 751 | // is invoked. |
| 752 | // A value is pulled and checked each time closeSequence() is called. |
| 753 | // |
| 754 | private final int stackBuf[] = new int[200] ; |
| 755 | private int stackTop = 0 ; |
| 756 | |
| 757 | } |