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 import jdk.internal.misc.JavaUtilZipFileAccess;
48 import jdk.internal.misc.SharedSecrets;
49
50 import static java.util.zip.ZipConstants64.*;
51
52 /**
53 * This class is used to read entries from a zip file.
54 *
55 * <p> Unless otherwise noted, passing a {@code null} argument to a constructor
56 * or method in this class will cause a {@link NullPointerException} to be
57 * thrown.
58 *
59 * @author David Connelly
60 */
61 public
62 class ZipFile implements ZipConstants, Closeable {
63 private long jzfile; // address of jzfile data
64 private final String name; // zip file name
65 private final int total; // total number of entries
66 private final boolean locsig; // if zip file starts with LOCSIG (usually true)
67 private volatile boolean closeRequested = false;
68
69 private static final int STORED = ZipEntry.STORED;
70 private static final int DEFLATED = ZipEntry.DEFLATED;
71
72 /**
73 * Mode flag to open a zip file for reading.
74 */
75 public static final int OPEN_READ = 0x1;
76
77 /**
78 * Mode flag to open a zip file and mark it for deletion. The file will be
79 * deleted some time between the moment that it is opened and the moment
80 * that it is closed, but its contents will remain accessible via the
81 * {@code ZipFile} object until either the close method is invoked or the
82 * virtual machine exits.
83 */
84 public static final int OPEN_DELETE = 0x4;
85
86 static {
87 /* Zip library is loaded from System.initializeSystemClass */
88 initIDs();
89 }
90
91 private static native void initIDs();
92
93 private static final boolean usemmap;
94
95 static {
96 // A system prpperty to disable mmap use to avoid vm crash when
97 // in-use zip file is accidently overwritten by others.
98 String prop = sun.misc.VM.getSavedProperty("sun.zip.disableMemoryMapping");
99 usemmap = (prop == null ||
100 !(prop.length() == 0 || prop.equalsIgnoreCase("true")));
101 }
102
103 /**
104 * Opens a zip file for reading.
105 *
106 * <p>First, if there is a security manager, its {@code checkRead}
107 * method is called with the {@code name} argument as its argument
108 * to ensure the read is allowed.
109 *
110 * <p>The UTF-8 {@link java.nio.charset.Charset charset} is used to
111 * decode the entry names and comments.
112 *
113 * @param name the name of the zip file
114 * @throws ZipException if a ZIP format error has occurred
115 * @throws IOException if an I/O error has occurred
116 * @throws SecurityException if a security manager exists and its
117 * {@code checkRead} method doesn't allow read access to the file.
118 *
119 * @see SecurityManager#checkRead(java.lang.String)
120 */
121 public ZipFile(String name) throws IOException {
122 this(new File(name), OPEN_READ);
123 }
124
125 /**
126 * Opens a new {@code ZipFile} to read from the specified
127 * {@code File} object in the specified mode. The mode argument
128 * must be either {@code OPEN_READ} or {@code OPEN_READ | OPEN_DELETE}.
129 *
130 * <p>First, if there is a security manager, its {@code checkRead}
131 * method is called with the {@code name} argument as its argument to
132 * ensure the read is allowed.
133 *
134 * <p>The UTF-8 {@link java.nio.charset.Charset charset} is used to
135 * decode the entry names and comments
136 *
137 * @param file the ZIP file to be opened for reading
138 * @param mode the mode in which the file is to be opened
139 * @throws ZipException if a ZIP format error has occurred
140 * @throws IOException if an I/O error has occurred
141 * @throws SecurityException if a security manager exists and
142 * its {@code checkRead} method
143 * doesn't allow read access to the file,
144 * or its {@code checkDelete} method doesn't allow deleting
145 * the file when the {@code OPEN_DELETE} flag is set.
146 * @throws IllegalArgumentException if the {@code mode} argument is invalid
147 * @see SecurityManager#checkRead(java.lang.String)
148 * @since 1.3
149 */
150 public ZipFile(File file, int mode) throws IOException {
151 this(file, mode, StandardCharsets.UTF_8);
152 }
153
154 /**
155 * Opens a ZIP file for reading given the specified File object.
156 *
157 * <p>The UTF-8 {@link java.nio.charset.Charset charset} is used to
158 * decode the entry names and comments.
159 *
160 * @param file the ZIP file to be opened for reading
161 * @throws ZipException if a ZIP format error has occurred
162 * @throws IOException if an I/O error has occurred
163 */
164 public ZipFile(File file) throws ZipException, IOException {
165 this(file, OPEN_READ);
166 }
167
168 private ZipCoder zc;
169
170 /**
171 * Opens a new {@code ZipFile} to read from the specified
172 * {@code File} object in the specified mode. The mode argument
173 * must be either {@code OPEN_READ} or {@code OPEN_READ | OPEN_DELETE}.
174 *
175 * <p>First, if there is a security manager, its {@code checkRead}
176 * method is called with the {@code name} argument as its argument to
177 * ensure the read is allowed.
178 *
179 * @param file the ZIP file to be opened for reading
180 * @param mode the mode in which the file is to be opened
181 * @param charset
182 * the {@linkplain java.nio.charset.Charset charset} to
183 * be used to decode the ZIP entry name and comment that are not
184 * encoded by using UTF-8 encoding (indicated by entry's general
185 * purpose flag).
186 *
187 * @throws ZipException if a ZIP format error has occurred
188 * @throws IOException if an I/O error has occurred
189 *
190 * @throws SecurityException
191 * if a security manager exists and its {@code checkRead}
192 * method doesn't allow read access to the file,or its
193 * {@code checkDelete} method doesn't allow deleting the
194 * file when the {@code OPEN_DELETE} flag is set
195 *
196 * @throws IllegalArgumentException if the {@code mode} argument is invalid
197 *
198 * @see SecurityManager#checkRead(java.lang.String)
199 *
200 * @since 1.7
201 */
202 public ZipFile(File file, int mode, Charset charset) throws IOException
203 {
204 if (((mode & OPEN_READ) == 0) ||
205 ((mode & ~(OPEN_READ | OPEN_DELETE)) != 0)) {
206 throw new IllegalArgumentException("Illegal mode: 0x"+
207 Integer.toHexString(mode));
208 }
209 String name = file.getPath();
210 SecurityManager sm = System.getSecurityManager();
211 if (sm != null) {
212 sm.checkRead(name);
213 if ((mode & OPEN_DELETE) != 0) {
214 sm.checkDelete(name);
215 }
216 }
217 if (charset == null)
218 throw new NullPointerException("charset is null");
219 this.zc = ZipCoder.get(charset);
220 long t0 = System.nanoTime();
221 jzfile = open(name, mode, file.lastModified(), usemmap);
222 sun.misc.PerfCounter.getZipFileOpenTime().addElapsedTimeFrom(t0);
223 sun.misc.PerfCounter.getZipFileCount().increment();
224 this.name = name;
225 this.total = getTotal(jzfile);
226 this.locsig = startsWithLOC(jzfile);
227 }
228
229 /**
230 * Opens a zip file for reading.
231 *
232 * <p>First, if there is a security manager, its {@code checkRead}
233 * method is called with the {@code name} argument as its argument
234 * to ensure the read is allowed.
235 *
236 * @param name the name of the zip file
237 * @param charset
238 * the {@linkplain java.nio.charset.Charset charset} to
239 * be used to decode the ZIP entry name and comment that are not
240 * encoded by using UTF-8 encoding (indicated by entry's general
241 * purpose flag).
242 *
243 * @throws ZipException if a ZIP format error has occurred
244 * @throws IOException if an I/O error has occurred
245 * @throws SecurityException
246 * if a security manager exists and its {@code checkRead}
247 * method doesn't allow read access to the file
248 *
249 * @see SecurityManager#checkRead(java.lang.String)
250 *
251 * @since 1.7
252 */
253 public ZipFile(String name, Charset charset) throws IOException
254 {
255 this(new File(name), OPEN_READ, charset);
256 }
257
258 /**
259 * Opens a ZIP file for reading given the specified File object.
260 * @param file the ZIP file to be opened for reading
261 * @param charset
262 * The {@linkplain java.nio.charset.Charset charset} to be
263 * used to decode the ZIP entry name and comment (ignored if
264 * the <a href="package-summary.html#lang_encoding"> language
265 * encoding bit</a> of the ZIP entry's general purpose bit
266 * flag is set).
267 *
268 * @throws ZipException if a ZIP format error has occurred
269 * @throws IOException if an I/O error has occurred
270 *
271 * @since 1.7
272 */
273 public ZipFile(File file, Charset charset) throws IOException
274 {
275 this(file, OPEN_READ, charset);
276 }
277
278 /**
279 * Returns the zip file comment, or null if none.
280 *
281 * @return the comment string for the zip file, or null if none
282 *
283 * @throws IllegalStateException if the zip file has been closed
284 *
285 * Since 1.7
286 */
287 public String getComment() {
288 synchronized (this) {
289 ensureOpen();
290 byte[] bcomm = getCommentBytes(jzfile);
291 if (bcomm == null)
292 return null;
293 return zc.toString(bcomm, bcomm.length);
294 }
295 }
296
297 /**
298 * Returns the zip file entry for the specified name, or null
299 * if not found.
300 *
301 * @param name the name of the entry
302 * @return the zip file entry, or null if not found
303 * @throws IllegalStateException if the zip file has been closed
304 */
305 public ZipEntry getEntry(String name) {
306 if (name == null) {
307 throw new NullPointerException("name");
308 }
309 long jzentry = 0;
310 synchronized (this) {
311 ensureOpen();
312 jzentry = getEntry(jzfile, zc.getBytes(name), true);
313 if (jzentry != 0) {
314 ZipEntry ze = getZipEntry(name, jzentry);
315 freeEntry(jzfile, jzentry);
316 return ze;
317 }
318 }
319 return null;
320 }
321
322 private static native long getEntry(long jzfile, byte[] name,
323 boolean addSlash);
324
325 // freeEntry releases the C jzentry struct.
326 private static native void freeEntry(long jzfile, long jzentry);
327
328 // the outstanding inputstreams that need to be closed,
329 // mapped to the inflater objects they use.
330 private final Map<InputStream, Inflater> streams = new WeakHashMap<>();
331
332 /**
333 * Returns an input stream for reading the contents of the specified
334 * zip file entry.
335 *
336 * <p> Closing this ZIP file will, in turn, close all input
337 * streams that have been returned by invocations of this method.
338 *
339 * @param entry the zip file entry
340 * @return the input stream for reading the contents of the specified
341 * zip file entry.
342 * @throws ZipException if a ZIP format error has occurred
343 * @throws IOException if an I/O error has occurred
344 * @throws IllegalStateException if the zip file has been closed
345 */
346 public InputStream getInputStream(ZipEntry entry) throws IOException {
347 if (entry == null) {
348 throw new NullPointerException("entry");
349 }
350 long jzentry = 0;
351 ZipFileInputStream in = null;
352 synchronized (this) {
353 ensureOpen();
354 if (!zc.isUTF8() && (entry.flag & EFS) != 0) {
355 jzentry = getEntry(jzfile, zc.getBytesUTF8(entry.name), false);
356 } else {
357 jzentry = getEntry(jzfile, zc.getBytes(entry.name), false);
358 }
359 if (jzentry == 0) {
360 return null;
361 }
362 in = new ZipFileInputStream(jzentry);
363
364 switch (getEntryMethod(jzentry)) {
365 case STORED:
366 synchronized (streams) {
367 streams.put(in, null);
368 }
369 return in;
370 case DEFLATED:
371 // MORE: Compute good size for inflater stream:
372 long size = getEntrySize(jzentry) + 2; // Inflater likes a bit of slack
373 if (size > 65536) size = 8192;
374 if (size <= 0) size = 4096;
375 Inflater inf = getInflater();
376 InputStream is =
377 new ZipFileInflaterInputStream(in, inf, (int)size);
378 synchronized (streams) {
379 streams.put(is, inf);
380 }
381 return is;
382 default:
383 throw new ZipException("invalid compression method");
384 }
385 }
386 }
387
388 private class ZipFileInflaterInputStream extends InflaterInputStream {
389 private volatile boolean closeRequested = false;
390 private boolean eof = false;
391 private final ZipFileInputStream zfin;
392
393 ZipFileInflaterInputStream(ZipFileInputStream zfin, Inflater inf,
394 int size) {
395 super(zfin, inf, size);
396 this.zfin = zfin;
397 }
398
399 public void close() throws IOException {
400 if (closeRequested)
401 return;
402 closeRequested = true;
403
404 super.close();
405 Inflater inf;
406 synchronized (streams) {
407 inf = streams.remove(this);
408 }
409 if (inf != null) {
410 releaseInflater(inf);
411 }
412 }
413
414 // Override fill() method to provide an extra "dummy" byte
415 // at the end of the input stream. This is required when
416 // using the "nowrap" Inflater option.
417 protected void fill() throws IOException {
418 if (eof) {
419 throw new EOFException("Unexpected end of ZLIB input stream");
420 }
421 len = in.read(buf, 0, buf.length);
422 if (len == -1) {
423 buf[0] = 0;
424 len = 1;
425 eof = true;
426 }
427 inf.setInput(buf, 0, len);
428 }
429
430 public int available() throws IOException {
431 if (closeRequested)
432 return 0;
433 long avail = zfin.size() - inf.getBytesWritten();
434 return (avail > (long) Integer.MAX_VALUE ?
435 Integer.MAX_VALUE : (int) avail);
436 }
437
438 protected void finalize() throws Throwable {
439 close();
440 }
441 }
442
443 /*
444 * Gets an inflater from the list of available inflaters or allocates
445 * a new one.
446 */
447 private Inflater getInflater() {
448 Inflater inf;
449 synchronized (inflaterCache) {
450 while (null != (inf = inflaterCache.poll())) {
451 if (false == inf.ended()) {
452 return inf;
453 }
454 }
455 }
456 return new Inflater(true);
457 }
458
459 /*
460 * Releases the specified inflater to the list of available inflaters.
461 */
462 private void releaseInflater(Inflater inf) {
463 if (false == inf.ended()) {
464 inf.reset();
465 synchronized (inflaterCache) {
466 inflaterCache.add(inf);
467 }
468 }
469 }
470
471 // List of available Inflater objects for decompression
472 private Deque<Inflater> inflaterCache = new ArrayDeque<>();
473
474 /**
475 * Returns the path name of the ZIP file.
476 * @return the path name of the ZIP file
477 */
478 public String getName() {
479 return name;
480 }
481
482 private class ZipEntryIterator implements Enumeration<ZipEntry>, Iterator<ZipEntry> {
483 private int i = 0;
484
485 public ZipEntryIterator() {
486 ensureOpen();
487 }
488
489 public boolean hasMoreElements() {
490 return hasNext();
491 }
492
493 public boolean hasNext() {
494 synchronized (ZipFile.this) {
495 ensureOpen();
496 return i < total;
497 }
498 }
499
500 public ZipEntry nextElement() {
501 return next();
502 }
503
504 public ZipEntry next() {
505 synchronized (ZipFile.this) {
506 ensureOpen();
507 if (i >= total) {
508 throw new NoSuchElementException();
509 }
510 long jzentry = getNextEntry(jzfile, i++);
511 if (jzentry == 0) {
512 String message;
513 if (closeRequested) {
514 message = "ZipFile concurrently closed";
515 } else {
516 message = getZipMessage(ZipFile.this.jzfile);
517 }
518 throw new ZipError("jzentry == 0" +
519 ",\n jzfile = " + ZipFile.this.jzfile +
520 ",\n total = " + ZipFile.this.total +
521 ",\n name = " + ZipFile.this.name +
522 ",\n i = " + i +
523 ",\n message = " + message
524 );
525 }
526 ZipEntry ze = getZipEntry(null, jzentry);
527 freeEntry(jzfile, jzentry);
528 return ze;
529 }
530 }
531
532 public Iterator<ZipEntry> asIterator() {
533 return this;
534 }
535 }
536
537 /**
538 * Returns an enumeration of the ZIP file entries.
539 * @return an enumeration of the ZIP file entries
540 * @throws IllegalStateException if the zip file has been closed
541 */
542 public Enumeration<? extends ZipEntry> entries() {
543 return new ZipEntryIterator();
544 }
545
546 /**
547 * Returns an ordered {@code Stream} over the ZIP file entries.
548 * Entries appear in the {@code Stream} in the order they appear in
549 * the central directory of the ZIP file.
550 *
551 * @return an ordered {@code Stream} of entries in this ZIP file
552 * @throws IllegalStateException if the zip file has been closed
553 * @since 1.8
554 */
555 public Stream<? extends ZipEntry> stream() {
556 return StreamSupport.stream(Spliterators.spliterator(
557 new ZipEntryIterator(), size(),
558 Spliterator.ORDERED | Spliterator.DISTINCT |
559 Spliterator.IMMUTABLE | Spliterator.NONNULL), false);
560 }
561
562 private ZipEntry getZipEntry(String name, long jzentry) {
563 ZipEntry e = new ZipEntry();
564 e.flag = getEntryFlag(jzentry); // get the flag first
565 if (name != null) {
566 e.name = name;
567 } else {
568 byte[] bname = getEntryBytes(jzentry, JZENTRY_NAME);
569 if (!zc.isUTF8() && (e.flag & EFS) != 0) {
570 e.name = zc.toStringUTF8(bname, bname.length);
571 } else {
572 e.name = zc.toString(bname, bname.length);
573 }
574 }
575 e.xdostime = getEntryTime(jzentry);
576 e.crc = getEntryCrc(jzentry);
577 e.size = getEntrySize(jzentry);
578 e.csize = getEntryCSize(jzentry);
579 e.method = getEntryMethod(jzentry);
580 e.setExtra0(getEntryBytes(jzentry, JZENTRY_EXTRA), false);
581 byte[] bcomm = getEntryBytes(jzentry, JZENTRY_COMMENT);
582 if (bcomm == null) {
583 e.comment = null;
584 } else {
585 if (!zc.isUTF8() && (e.flag & EFS) != 0) {
586 e.comment = zc.toStringUTF8(bcomm, bcomm.length);
587 } else {
588 e.comment = zc.toString(bcomm, bcomm.length);
589 }
590 }
591 return e;
592 }
593
594 private static native long getNextEntry(long jzfile, int i);
595
596 /**
597 * Returns the number of entries in the ZIP file.
598 * @return the number of entries in the ZIP file
599 * @throws IllegalStateException if the zip file has been closed
600 */
601 public int size() {
602 ensureOpen();
603 return total;
604 }
605
606 /**
607 * Closes the ZIP file.
608 * <p> Closing this ZIP file will close all of the input streams
609 * previously returned by invocations of the {@link #getInputStream
610 * getInputStream} method.
611 *
612 * @throws IOException if an I/O error has occurred
613 */
614 public void close() throws IOException {
615 if (closeRequested)
616 return;
617 closeRequested = true;
618
619 synchronized (this) {
620 // Close streams, release their inflaters
621 synchronized (streams) {
622 if (false == streams.isEmpty()) {
623 Map<InputStream, Inflater> copy = new HashMap<>(streams);
624 streams.clear();
625 for (Map.Entry<InputStream, Inflater> e : copy.entrySet()) {
626 e.getKey().close();
627 Inflater inf = e.getValue();
628 if (inf != null) {
629 inf.end();
630 }
631 }
632 }
633 }
634
635 // Release cached inflaters
636 Inflater inf;
637 synchronized (inflaterCache) {
638 while (null != (inf = inflaterCache.poll())) {
639 inf.end();
640 }
641 }
642
643 if (jzfile != 0) {
644 // Close the zip file
645 long zf = this.jzfile;
646 jzfile = 0;
647
648 close(zf);
649 }
650 }
651 }
652
653 /**
654 * Ensures that the system resources held by this ZipFile object are
655 * released when there are no more references to it.
656 *
657 * <p>
658 * Since the time when GC would invoke this method is undetermined,
659 * it is strongly recommended that applications invoke the {@code close}
660 * method as soon they have finished accessing this {@code ZipFile}.
661 * This will prevent holding up system resources for an undetermined
662 * length of time.
663 *
664 * @throws IOException if an I/O error has occurred
665 * @see java.util.zip.ZipFile#close()
666 */
667 protected void finalize() throws IOException {
668 close();
669 }
670
671 private static native void close(long jzfile);
672
673 private void ensureOpen() {
674 if (closeRequested) {
675 throw new IllegalStateException("zip file closed");
676 }
677
678 if (jzfile == 0) {
679 throw new IllegalStateException("The object is not initialized.");
680 }
681 }
682
683 private void ensureOpenOrZipException() throws IOException {
684 if (closeRequested) {
685 throw new ZipException("ZipFile closed");
686 }
687 }
688
689 /*
690 * Inner class implementing the input stream used to read a
691 * (possibly compressed) zip file entry.
692 */
693 private class ZipFileInputStream extends InputStream {
694 private volatile boolean closeRequested = false;
695 protected long jzentry; // address of jzentry data
696 private long pos; // current position within entry data
697 protected long rem; // number of remaining bytes within entry
698 protected long size; // uncompressed size of this entry
699
700 ZipFileInputStream(long jzentry) {
701 pos = 0;
702 rem = getEntryCSize(jzentry);
703 size = getEntrySize(jzentry);
704 this.jzentry = jzentry;
705 }
706
707 public int read(byte b[], int off, int len) throws IOException {
708 synchronized (ZipFile.this) {
709 long rem = this.rem;
710 long pos = this.pos;
711 if (rem == 0) {
712 return -1;
713 }
714 if (len <= 0) {
715 return 0;
716 }
717 if (len > rem) {
718 len = (int) rem;
719 }
720
721 ensureOpenOrZipException();
722 len = ZipFile.read(ZipFile.this.jzfile, jzentry, pos, b,
723 off, len);
724 if (len > 0) {
725 this.pos = (pos + len);
726 this.rem = (rem - len);
727 }
728 }
729 if (rem == 0) {
730 close();
731 }
732 return len;
733 }
734
735 public int read() throws IOException {
736 byte[] b = new byte[1];
737 if (read(b, 0, 1) == 1) {
738 return b[0] & 0xff;
739 } else {
740 return -1;
741 }
742 }
743
744 public long skip(long n) {
745 if (n > rem)
746 n = rem;
747 pos += n;
748 rem -= n;
749 if (rem == 0) {
750 close();
751 }
752 return n;
753 }
754
755 public int available() {
756 return rem > Integer.MAX_VALUE ? Integer.MAX_VALUE : (int) rem;
757 }
758
759 public long size() {
760 return size;
761 }
762
763 public void close() {
764 if (closeRequested)
765 return;
766 closeRequested = true;
767
768 rem = 0;
769 synchronized (ZipFile.this) {
770 if (jzentry != 0 && ZipFile.this.jzfile != 0) {
771 freeEntry(ZipFile.this.jzfile, jzentry);
772 jzentry = 0;
773 }
774 }
775 synchronized (streams) {
776 streams.remove(this);
777 }
778 }
779
780 protected void finalize() {
781 close();
782 }
783 }
784
785 static {
786 SharedSecrets.setJavaUtilZipFileAccess(
787 new JavaUtilZipFileAccess() {
788 public boolean startsWithLocHeader(ZipFile zip) {
789 return zip.startsWithLocHeader();
790 }
791 }
792 );
793 }
794
795 /**
796 * Returns {@code true} if, and only if, the zip file begins with {@code
797 * LOCSIG}.
798 */
799 private boolean startsWithLocHeader() {
800 return locsig;
801 }
802
803 private static native long open(String name, int mode, long lastModified,
804 boolean usemmap) throws IOException;
805 private static native int getTotal(long jzfile);
806 private static native boolean startsWithLOC(long jzfile);
807 private static native int read(long jzfile, long jzentry,
808 long pos, byte[] b, int off, int len);
809
810 // access to the native zentry object
811 private static native long getEntryTime(long jzentry);
812 private static native long getEntryCrc(long jzentry);
813 private static native long getEntryCSize(long jzentry);
814 private static native long getEntrySize(long jzentry);
815 private static native int getEntryMethod(long jzentry);
816 private static native int getEntryFlag(long jzentry);
817 private static native byte[] getCommentBytes(long jzfile);
818
819 private static final int JZENTRY_NAME = 0;
820 private static final int JZENTRY_EXTRA = 1;
821 private static final int JZENTRY_COMMENT = 2;
822 private static native byte[] getEntryBytes(long jzentry, int type);
823
824 private static native String getZipMessage(long jzfile);
825 }