1 /* 2 * Copyright (c) 1995, 2015, Oracle and/or its affiliates. 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. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package java.util.zip; 27 28 import java.io.Closeable; 29 import java.io.InputStream; 30 import java.io.IOException; 31 import java.io.EOFException; 32 import java.io.File; 33 import java.nio.charset.Charset; 34 import java.nio.charset.StandardCharsets; 35 import java.util.ArrayDeque; 36 import java.util.Deque; 37 import java.util.Enumeration; 38 import java.util.HashMap; 39 import java.util.Iterator; 40 import java.util.Map; 41 import java.util.NoSuchElementException; 42 import java.util.Spliterator; 43 import java.util.Spliterators; 44 import java.util.WeakHashMap; 45 import java.util.stream.Stream; 46 import java.util.stream.StreamSupport; 47 48 import static java.util.zip.ZipConstants64.*; 49 50 /** 51 * This class is used to read entries from a zip file. 52 * 53 * <p> Unless otherwise noted, passing a {@code null} argument to a constructor 54 * or method in this class will cause a {@link NullPointerException} to be 55 * thrown. 56 * 57 * @author David Connelly 58 */ 59 public 60 class ZipFile implements ZipConstants, Closeable { 61 private long jzfile; // address of jzfile data 62 private final String name; // zip file name 63 private final int total; // total number of entries 64 private final boolean locsig; // if zip file starts with LOCSIG (usually true) 65 private volatile boolean closeRequested = false; 66 67 private static final int STORED = ZipEntry.STORED; 68 private static final int DEFLATED = ZipEntry.DEFLATED; 69 70 /** 71 * Mode flag to open a zip file for reading. 72 */ 73 public static final int OPEN_READ = 0x1; 74 75 /** 76 * Mode flag to open a zip file and mark it for deletion. The file will be 77 * deleted some time between the moment that it is opened and the moment 78 * that it is closed, but its contents will remain accessible via the 79 * {@code ZipFile} object until either the close method is invoked or the 80 * virtual machine exits. 81 */ 82 public static final int OPEN_DELETE = 0x4; 83 84 static { 85 /* Zip library is loaded from System.initializeSystemClass */ 86 initIDs(); 87 } 88 89 private static native void initIDs(); 90 91 private static final boolean usemmap; 92 93 static { 94 // A system prpperty to disable mmap use to avoid vm crash when 95 // in-use zip file is accidently overwritten by others. 96 String prop = sun.misc.VM.getSavedProperty("sun.zip.disableMemoryMapping"); 97 usemmap = (prop == null || 98 !(prop.length() == 0 || prop.equalsIgnoreCase("true"))); 99 } 100 101 /** 102 * Opens a zip file for reading. 103 * 104 * <p>First, if there is a security manager, its {@code checkRead} 105 * method is called with the {@code name} argument as its argument 106 * to ensure the read is allowed. 107 * 108 * <p>The UTF-8 {@link java.nio.charset.Charset charset} is used to 109 * decode the entry names and comments. 110 * 111 * @param name the name of the zip file 112 * @throws ZipException if a ZIP format error has occurred 113 * @throws IOException if an I/O error has occurred 114 * @throws SecurityException if a security manager exists and its 115 * {@code checkRead} method doesn't allow read access to the file. 116 * 117 * @see SecurityManager#checkRead(java.lang.String) 118 */ 119 public ZipFile(String name) throws IOException { 120 this(new File(name), OPEN_READ); 121 } 122 123 /** 124 * Opens a new {@code ZipFile} to read from the specified 125 * {@code File} object in the specified mode. The mode argument 126 * must be either {@code OPEN_READ} or {@code OPEN_READ | OPEN_DELETE}. 127 * 128 * <p>First, if there is a security manager, its {@code checkRead} 129 * method is called with the {@code name} argument as its argument to 130 * ensure the read is allowed. 131 * 132 * <p>The UTF-8 {@link java.nio.charset.Charset charset} is used to 133 * decode the entry names and comments 134 * 135 * @param file the ZIP file to be opened for reading 136 * @param mode the mode in which the file is to be opened 137 * @throws ZipException if a ZIP format error has occurred 138 * @throws IOException if an I/O error has occurred 139 * @throws SecurityException if a security manager exists and 140 * its {@code checkRead} method 141 * doesn't allow read access to the file, 142 * or its {@code checkDelete} method doesn't allow deleting 143 * the file when the {@code OPEN_DELETE} flag is set. 144 * @throws IllegalArgumentException if the {@code mode} argument is invalid 145 * @see SecurityManager#checkRead(java.lang.String) 146 * @since 1.3 147 */ 148 public ZipFile(File file, int mode) throws IOException { 149 this(file, mode, StandardCharsets.UTF_8); 150 } 151 152 /** 153 * Opens a ZIP file for reading given the specified File object. 154 * 155 * <p>The UTF-8 {@link java.nio.charset.Charset charset} is used to 156 * decode the entry names and comments. 157 * 158 * @param file the ZIP file to be opened for reading 159 * @throws ZipException if a ZIP format error has occurred 160 * @throws IOException if an I/O error has occurred 161 */ 162 public ZipFile(File file) throws ZipException, IOException { 163 this(file, OPEN_READ); 164 } 165 166 private ZipCoder zc; 167 168 /** 169 * Opens a new {@code ZipFile} to read from the specified 170 * {@code File} object in the specified mode. The mode argument 171 * must be either {@code OPEN_READ} or {@code OPEN_READ | OPEN_DELETE}. 172 * 173 * <p>First, if there is a security manager, its {@code checkRead} 174 * method is called with the {@code name} argument as its argument to 175 * ensure the read is allowed. 176 * 177 * @param file the ZIP file to be opened for reading 178 * @param mode the mode in which the file is to be opened 179 * @param charset 180 * the {@linkplain java.nio.charset.Charset charset} to 181 * be used to decode the ZIP entry name and comment that are not 182 * encoded by using UTF-8 encoding (indicated by entry's general 183 * purpose flag). 184 * 185 * @throws ZipException if a ZIP format error has occurred 186 * @throws IOException if an I/O error has occurred 187 * 188 * @throws SecurityException 189 * if a security manager exists and its {@code checkRead} 190 * method doesn't allow read access to the file,or its 191 * {@code checkDelete} method doesn't allow deleting the 192 * file when the {@code OPEN_DELETE} flag is set 193 * 194 * @throws IllegalArgumentException if the {@code mode} argument is invalid 195 * 196 * @see SecurityManager#checkRead(java.lang.String) 197 * 198 * @since 1.7 199 */ 200 public ZipFile(File file, int mode, Charset charset) throws IOException 201 { 202 if (((mode & OPEN_READ) == 0) || 203 ((mode & ~(OPEN_READ | OPEN_DELETE)) != 0)) { 204 throw new IllegalArgumentException("Illegal mode: 0x"+ 205 Integer.toHexString(mode)); 206 } 207 String name = file.getPath(); 208 SecurityManager sm = System.getSecurityManager(); 209 if (sm != null) { 210 sm.checkRead(name); 211 if ((mode & OPEN_DELETE) != 0) { 212 sm.checkDelete(name); 213 } 214 } 215 if (charset == null) 216 throw new NullPointerException("charset is null"); 217 this.zc = ZipCoder.get(charset); 218 long t0 = System.nanoTime(); 219 jzfile = open(name, mode, file.lastModified(), usemmap); 220 sun.misc.PerfCounter.getZipFileOpenTime().addElapsedTimeFrom(t0); 221 sun.misc.PerfCounter.getZipFileCount().increment(); 222 this.name = name; 223 this.total = getTotal(jzfile); 224 this.locsig = startsWithLOC(jzfile); 225 } 226 227 /** 228 * Opens a zip file for reading. 229 * 230 * <p>First, if there is a security manager, its {@code checkRead} 231 * method is called with the {@code name} argument as its argument 232 * to ensure the read is allowed. 233 * 234 * @param name the name of the zip file 235 * @param charset 236 * the {@linkplain java.nio.charset.Charset charset} to 237 * be used to decode the ZIP entry name and comment that are not 238 * encoded by using UTF-8 encoding (indicated by entry's general 239 * purpose flag). 240 * 241 * @throws ZipException if a ZIP format error has occurred 242 * @throws IOException if an I/O error has occurred 243 * @throws SecurityException 244 * if a security manager exists and its {@code checkRead} 245 * method doesn't allow read access to the file 246 * 247 * @see SecurityManager#checkRead(java.lang.String) 248 * 249 * @since 1.7 250 */ 251 public ZipFile(String name, Charset charset) throws IOException 252 { 253 this(new File(name), OPEN_READ, charset); 254 } 255 256 /** 257 * Opens a ZIP file for reading given the specified File object. 258 * @param file the ZIP file to be opened for reading 259 * @param charset 260 * The {@linkplain java.nio.charset.Charset charset} to be 261 * used to decode the ZIP entry name and comment (ignored if 262 * the <a href="package-summary.html#lang_encoding"> language 263 * encoding bit</a> of the ZIP entry's general purpose bit 264 * flag is set). 265 * 266 * @throws ZipException if a ZIP format error has occurred 267 * @throws IOException if an I/O error has occurred 268 * 269 * @since 1.7 270 */ 271 public ZipFile(File file, Charset charset) throws IOException 272 { 273 this(file, OPEN_READ, charset); 274 } 275 276 /** 277 * Returns the zip file comment, or null if none. 278 * 279 * @return the comment string for the zip file, or null if none 280 * 281 * @throws IllegalStateException if the zip file has been closed 282 * 283 * Since 1.7 284 */ 285 public String getComment() { 286 synchronized (this) { 287 ensureOpen(); 288 byte[] bcomm = getCommentBytes(jzfile); 289 if (bcomm == null) 290 return null; 291 return zc.toString(bcomm, bcomm.length); 292 } 293 } 294 295 /** 296 * Returns the zip file entry for the specified name, or null 297 * if not found. 298 * 299 * @param name the name of the entry 300 * @return the zip file entry, or null if not found 301 * @throws IllegalStateException if the zip file has been closed 302 */ 303 public ZipEntry getEntry(String name) { 304 if (name == null) { 305 throw new NullPointerException("name"); 306 } 307 long jzentry = 0; 308 synchronized (this) { 309 ensureOpen(); 310 jzentry = getEntry(jzfile, zc.getBytes(name), true); 311 if (jzentry != 0) { 312 ZipEntry ze = getZipEntry(name, jzentry); 313 freeEntry(jzfile, jzentry); 314 return ze; 315 } 316 } 317 return null; 318 } 319 320 private static native long getEntry(long jzfile, byte[] name, 321 boolean addSlash); 322 323 // freeEntry releases the C jzentry struct. 324 private static native void freeEntry(long jzfile, long jzentry); 325 326 // the outstanding inputstreams that need to be closed, 327 // mapped to the inflater objects they use. 328 private final Map<InputStream, Inflater> streams = new WeakHashMap<>(); 329 330 /** 331 * Returns an input stream for reading the contents of the specified 332 * zip file entry. 333 * 334 * <p> Closing this ZIP file will, in turn, close all input 335 * streams that have been returned by invocations of this method. 336 * 337 * @param entry the zip file entry 338 * @return the input stream for reading the contents of the specified 339 * zip file entry. 340 * @throws ZipException if a ZIP format error has occurred 341 * @throws IOException if an I/O error has occurred 342 * @throws IllegalStateException if the zip file has been closed 343 */ 344 public InputStream getInputStream(ZipEntry entry) throws IOException { 345 if (entry == null) { 346 throw new NullPointerException("entry"); 347 } 348 long jzentry = 0; 349 ZipFileInputStream in = null; 350 synchronized (this) { 351 ensureOpen(); 352 if (!zc.isUTF8() && (entry.flag & EFS) != 0) { 353 jzentry = getEntry(jzfile, zc.getBytesUTF8(entry.name), false); 354 } else { 355 jzentry = getEntry(jzfile, zc.getBytes(entry.name), false); 356 } 357 if (jzentry == 0) { 358 return null; 359 } 360 in = new ZipFileInputStream(jzentry); 361 362 switch (getEntryMethod(jzentry)) { 363 case STORED: 364 synchronized (streams) { 365 streams.put(in, null); 366 } 367 return in; 368 case DEFLATED: 369 // MORE: Compute good size for inflater stream: 370 long size = getEntrySize(jzentry) + 2; // Inflater likes a bit of slack 371 if (size > 65536) size = 8192; 372 if (size <= 0) size = 4096; 373 Inflater inf = getInflater(); 374 InputStream is = 375 new ZipFileInflaterInputStream(in, inf, (int)size); 376 synchronized (streams) { 377 streams.put(is, inf); 378 } 379 return is; 380 default: 381 throw new ZipException("invalid compression method"); 382 } 383 } 384 } 385 386 private class ZipFileInflaterInputStream extends InflaterInputStream { 387 private volatile boolean closeRequested = false; 388 private boolean eof = false; 389 private final ZipFileInputStream zfin; 390 391 ZipFileInflaterInputStream(ZipFileInputStream zfin, Inflater inf, 392 int size) { 393 super(zfin, inf, size); 394 this.zfin = zfin; 395 } 396 397 public void close() throws IOException { 398 if (closeRequested) 399 return; 400 closeRequested = true; 401 402 super.close(); 403 Inflater inf; 404 synchronized (streams) { 405 inf = streams.remove(this); 406 } 407 if (inf != null) { 408 releaseInflater(inf); 409 } 410 } 411 412 // Override fill() method to provide an extra "dummy" byte 413 // at the end of the input stream. This is required when 414 // using the "nowrap" Inflater option. 415 protected void fill() throws IOException { 416 if (eof) { 417 throw new EOFException("Unexpected end of ZLIB input stream"); 418 } 419 len = in.read(buf, 0, buf.length); 420 if (len == -1) { 421 buf[0] = 0; 422 len = 1; 423 eof = true; 424 } 425 inf.setInput(buf, 0, len); 426 } 427 428 public int available() throws IOException { 429 if (closeRequested) 430 return 0; 431 long avail = zfin.size() - inf.getBytesWritten(); 432 return (avail > (long) Integer.MAX_VALUE ? 433 Integer.MAX_VALUE : (int) avail); 434 } 435 436 protected void finalize() throws Throwable { 437 close(); 438 } 439 } 440 441 /* 442 * Gets an inflater from the list of available inflaters or allocates 443 * a new one. 444 */ 445 private Inflater getInflater() { 446 Inflater inf; 447 synchronized (inflaterCache) { 448 while (null != (inf = inflaterCache.poll())) { 449 if (false == inf.ended()) { 450 return inf; 451 } 452 } 453 } 454 return new Inflater(true); 455 } 456 457 /* 458 * Releases the specified inflater to the list of available inflaters. 459 */ 460 private void releaseInflater(Inflater inf) { 461 if (false == inf.ended()) { 462 inf.reset(); 463 synchronized (inflaterCache) { 464 inflaterCache.add(inf); 465 } 466 } 467 } 468 469 // List of available Inflater objects for decompression 470 private Deque<Inflater> inflaterCache = new ArrayDeque<>(); 471 472 /** 473 * Returns the path name of the ZIP file. 474 * @return the path name of the ZIP file 475 */ 476 public String getName() { 477 return name; 478 } 479 480 private class ZipEntryIterator implements Enumeration<ZipEntry>, Iterator<ZipEntry> { 481 private int i = 0; 482 483 public ZipEntryIterator() { 484 ensureOpen(); 485 } 486 487 public boolean hasMoreElements() { 488 return hasNext(); 489 } 490 491 public boolean hasNext() { 492 synchronized (ZipFile.this) { 493 ensureOpen(); 494 return i < total; 495 } 496 } 497 498 public ZipEntry nextElement() { 499 return next(); 500 } 501 502 public ZipEntry next() { 503 synchronized (ZipFile.this) { 504 ensureOpen(); 505 if (i >= total) { 506 throw new NoSuchElementException(); 507 } 508 long jzentry = getNextEntry(jzfile, i++); 509 if (jzentry == 0) { 510 String message; 511 if (closeRequested) { 512 message = "ZipFile concurrently closed"; 513 } else { 514 message = getZipMessage(ZipFile.this.jzfile); 515 } 516 throw new ZipError("jzentry == 0" + 517 ",\n jzfile = " + ZipFile.this.jzfile + 518 ",\n total = " + ZipFile.this.total + 519 ",\n name = " + ZipFile.this.name + 520 ",\n i = " + i + 521 ",\n message = " + message 522 ); 523 } 524 ZipEntry ze = getZipEntry(null, jzentry); 525 freeEntry(jzfile, jzentry); 526 return ze; 527 } 528 } 529 530 public Iterator<ZipEntry> asIterator() { 531 return this; 532 } 533 } 534 535 /** 536 * Returns an enumeration of the ZIP file entries. 537 * @return an enumeration of the ZIP file entries 538 * @throws IllegalStateException if the zip file has been closed 539 */ 540 public Enumeration<? extends ZipEntry> entries() { 541 return new ZipEntryIterator(); 542 } 543 544 /** 545 * Returns an ordered {@code Stream} over the ZIP file entries. 546 * Entries appear in the {@code Stream} in the order they appear in 547 * the central directory of the ZIP file. 548 * 549 * @return an ordered {@code Stream} of entries in this ZIP file 550 * @throws IllegalStateException if the zip file has been closed 551 * @since 1.8 552 */ 553 public Stream<? extends ZipEntry> stream() { 554 return StreamSupport.stream(Spliterators.spliterator( 555 new ZipEntryIterator(), size(), 556 Spliterator.ORDERED | Spliterator.DISTINCT | 557 Spliterator.IMMUTABLE | Spliterator.NONNULL), false); 558 } 559 560 private ZipEntry getZipEntry(String name, long jzentry) { 561 ZipEntry e = new ZipEntry(); 562 e.flag = getEntryFlag(jzentry); // get the flag first 563 if (name != null) { 564 e.name = name; 565 } else { 566 byte[] bname = getEntryBytes(jzentry, JZENTRY_NAME); 567 if (!zc.isUTF8() && (e.flag & EFS) != 0) { 568 e.name = zc.toStringUTF8(bname, bname.length); 569 } else { 570 e.name = zc.toString(bname, bname.length); 571 } 572 } 573 e.xdostime = getEntryTime(jzentry); 574 e.crc = getEntryCrc(jzentry); 575 e.size = getEntrySize(jzentry); 576 e.csize = getEntryCSize(jzentry); 577 e.method = getEntryMethod(jzentry); 578 e.setExtra0(getEntryBytes(jzentry, JZENTRY_EXTRA), false); 579 byte[] bcomm = getEntryBytes(jzentry, JZENTRY_COMMENT); 580 if (bcomm == null) { 581 e.comment = null; 582 } else { 583 if (!zc.isUTF8() && (e.flag & EFS) != 0) { 584 e.comment = zc.toStringUTF8(bcomm, bcomm.length); 585 } else { 586 e.comment = zc.toString(bcomm, bcomm.length); 587 } 588 } 589 return e; 590 } 591 592 private static native long getNextEntry(long jzfile, int i); 593 594 /** 595 * Returns the number of entries in the ZIP file. 596 * @return the number of entries in the ZIP file 597 * @throws IllegalStateException if the zip file has been closed 598 */ 599 public int size() { 600 ensureOpen(); 601 return total; 602 } 603 604 /** 605 * Closes the ZIP file. 606 * <p> Closing this ZIP file will close all of the input streams 607 * previously returned by invocations of the {@link #getInputStream 608 * getInputStream} method. 609 * 610 * @throws IOException if an I/O error has occurred 611 */ 612 public void close() throws IOException { 613 if (closeRequested) 614 return; 615 closeRequested = true; 616 617 synchronized (this) { 618 // Close streams, release their inflaters 619 synchronized (streams) { 620 if (false == streams.isEmpty()) { 621 Map<InputStream, Inflater> copy = new HashMap<>(streams); 622 streams.clear(); 623 for (Map.Entry<InputStream, Inflater> e : copy.entrySet()) { 624 e.getKey().close(); 625 Inflater inf = e.getValue(); 626 if (inf != null) { 627 inf.end(); 628 } 629 } 630 } 631 } 632 633 // Release cached inflaters 634 Inflater inf; 635 synchronized (inflaterCache) { 636 while (null != (inf = inflaterCache.poll())) { 637 inf.end(); 638 } 639 } 640 641 if (jzfile != 0) { 642 // Close the zip file 643 long zf = this.jzfile; 644 jzfile = 0; 645 646 close(zf); 647 } 648 } 649 } 650 651 /** 652 * Ensures that the system resources held by this ZipFile object are 653 * released when there are no more references to it. 654 * 655 * <p> 656 * Since the time when GC would invoke this method is undetermined, 657 * it is strongly recommended that applications invoke the {@code close} 658 * method as soon they have finished accessing this {@code ZipFile}. 659 * This will prevent holding up system resources for an undetermined 660 * length of time. 661 * 662 * @throws IOException if an I/O error has occurred 663 * @see java.util.zip.ZipFile#close() 664 */ 665 protected void finalize() throws IOException { 666 close(); 667 } 668 669 private static native void close(long jzfile); 670 671 private void ensureOpen() { 672 if (closeRequested) { 673 throw new IllegalStateException("zip file closed"); 674 } 675 676 if (jzfile == 0) { 677 throw new IllegalStateException("The object is not initialized."); 678 } 679 } 680 681 private void ensureOpenOrZipException() throws IOException { 682 if (closeRequested) { 683 throw new ZipException("ZipFile closed"); 684 } 685 } 686 687 /* 688 * Inner class implementing the input stream used to read a 689 * (possibly compressed) zip file entry. 690 */ 691 private class ZipFileInputStream extends InputStream { 692 private volatile boolean closeRequested = false; 693 protected long jzentry; // address of jzentry data 694 private long pos; // current position within entry data 695 protected long rem; // number of remaining bytes within entry 696 protected long size; // uncompressed size of this entry 697 698 ZipFileInputStream(long jzentry) { 699 pos = 0; 700 rem = getEntryCSize(jzentry); 701 size = getEntrySize(jzentry); 702 this.jzentry = jzentry; 703 } 704 705 public int read(byte b[], int off, int len) throws IOException { 706 synchronized (ZipFile.this) { 707 long rem = this.rem; 708 long pos = this.pos; 709 if (rem == 0) { 710 return -1; 711 } 712 if (len <= 0) { 713 return 0; 714 } 715 if (len > rem) { 716 len = (int) rem; 717 } 718 719 ensureOpenOrZipException(); 720 len = ZipFile.read(ZipFile.this.jzfile, jzentry, pos, b, 721 off, len); 722 if (len > 0) { 723 this.pos = (pos + len); 724 this.rem = (rem - len); 725 } 726 } 727 if (rem == 0) { 728 close(); 729 } 730 return len; 731 } 732 733 public int read() throws IOException { 734 byte[] b = new byte[1]; 735 if (read(b, 0, 1) == 1) { 736 return b[0] & 0xff; 737 } else { 738 return -1; 739 } 740 } 741 742 public long skip(long n) { 743 if (n > rem) 744 n = rem; 745 pos += n; 746 rem -= n; 747 if (rem == 0) { 748 close(); 749 } 750 return n; 751 } 752 753 public int available() { 754 return rem > Integer.MAX_VALUE ? Integer.MAX_VALUE : (int) rem; 755 } 756 757 public long size() { 758 return size; 759 } 760 761 public void close() { 762 if (closeRequested) 763 return; 764 closeRequested = true; 765 766 rem = 0; 767 synchronized (ZipFile.this) { 768 if (jzentry != 0 && ZipFile.this.jzfile != 0) { 769 freeEntry(ZipFile.this.jzfile, jzentry); 770 jzentry = 0; 771 } 772 } 773 synchronized (streams) { 774 streams.remove(this); 775 } 776 } 777 778 protected void finalize() { 779 close(); 780 } 781 } 782 783 static { 784 sun.misc.SharedSecrets.setJavaUtilZipFileAccess( 785 new sun.misc.JavaUtilZipFileAccess() { 786 public boolean startsWithLocHeader(ZipFile zip) { 787 return zip.startsWithLocHeader(); 788 } 789 } 790 ); 791 } 792 793 /** 794 * Returns {@code true} if, and only if, the zip file begins with {@code 795 * LOCSIG}. 796 */ 797 private boolean startsWithLocHeader() { 798 return locsig; 799 } 800 801 private static native long open(String name, int mode, long lastModified, 802 boolean usemmap) throws IOException; 803 private static native int getTotal(long jzfile); 804 private static native boolean startsWithLOC(long jzfile); 805 private static native int read(long jzfile, long jzentry, 806 long pos, byte[] b, int off, int len); 807 808 // access to the native zentry object 809 private static native long getEntryTime(long jzentry); 810 private static native long getEntryCrc(long jzentry); 811 private static native long getEntryCSize(long jzentry); 812 private static native long getEntrySize(long jzentry); 813 private static native int getEntryMethod(long jzentry); 814 private static native int getEntryFlag(long jzentry); 815 private static native byte[] getCommentBytes(long jzfile); 816 817 private static final int JZENTRY_NAME = 0; 818 private static final int JZENTRY_EXTRA = 1; 819 private static final int JZENTRY_COMMENT = 2; 820 private static native byte[] getEntryBytes(long jzentry, int type); 821 822 private static native String getZipMessage(long jzfile); 823 }