1 /*
2 * Copyright (c) 1995, 2017, 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.io.RandomAccessFile;
34 import java.io.UncheckedIOException;
35 import java.lang.ref.Cleaner.Cleanable;
36 import java.nio.charset.Charset;
37 import java.nio.charset.StandardCharsets;
38 import java.nio.file.attribute.BasicFileAttributes;
39 import java.nio.file.Files;
40
41 import java.util.ArrayDeque;
42 import java.util.ArrayList;
43 import java.util.Arrays;
44 import java.util.Collections;
45 import java.util.Deque;
46 import java.util.Enumeration;
47 import java.util.HashMap;
48 import java.util.Iterator;
49 import java.util.Objects;
50 import java.util.NoSuchElementException;
51 import java.util.Set;
52 import java.util.Spliterator;
53 import java.util.Spliterators;
54 import java.util.WeakHashMap;
55
56 import java.util.function.Consumer;
57 import java.util.function.Function;
58 import java.util.function.IntFunction;
59 import java.util.jar.JarEntry;
60 import java.util.stream.Stream;
61 import java.util.stream.StreamSupport;
62 import jdk.internal.misc.JavaUtilZipFileAccess;
63 import jdk.internal.misc.SharedSecrets;
64 import jdk.internal.misc.VM;
65 import jdk.internal.perf.PerfCounter;
66 import jdk.internal.ref.CleanerFactory;
67
68 import static java.util.zip.ZipConstants64.*;
69 import static java.util.zip.ZipUtils.*;
70
71 /**
72 * This class is used to read entries from a zip file.
73 *
74 * <p> Unless otherwise noted, passing a {@code null} argument to a constructor
75 * or method in this class will cause a {@link NullPointerException} to be
76 * thrown.
77 *
78 * @apiNote
79 * To release resources used by this {@code ZipFile}, the {@link #close()} method
80 * should be called explicitly or by try-with-resources. Subclasses are responsible
81 * for the cleanup of resources acquired by the subclass. Subclasses that override
82 * {@link #finalize()} in order to perform cleanup should be modified to use alternative
83 * cleanup mechanisms such as {@link java.lang.ref.Cleaner} and remove the overriding
84 * {@code finalize} method.
85 *
86 * @implSpec
87 * If this {@code ZipFile} has been subclassed and the {@code close} method has
88 * been overridden, the {@code close} method will be called by the finalization
89 * when {@code ZipFile} is unreachable. But the subclasses should not depend on
90 * this specific implementation; the finalization is not reliable and the
91 * {@code finalize} method is deprecated to be removed.
92 *
93 * @author David Connelly
94 * @since 1.1
95 */
96 public
97 class ZipFile implements ZipConstants, Closeable {
98
99 private final String name; // zip file name
100 private volatile boolean closeRequested;
101 private ZipCoder zc;
102
103 // The "resource" used by this zip file that needs to be
104 // cleaned after use.
105 // a) the input streams that need to be closed
106 // b) the list of cached Inflater objects
107 // c) the "native" source of this zip file.
108 private final CleanableResource res;
109
110 private static final int STORED = ZipEntry.STORED;
111 private static final int DEFLATED = ZipEntry.DEFLATED;
112
113 /**
114 * Mode flag to open a zip file for reading.
115 */
116 public static final int OPEN_READ = 0x1;
117
118 /**
119 * Mode flag to open a zip file and mark it for deletion. The file will be
120 * deleted some time between the moment that it is opened and the moment
121 * that it is closed, but its contents will remain accessible via the
122 * {@code ZipFile} object until either the close method is invoked or the
123 * virtual machine exits.
124 */
125 public static final int OPEN_DELETE = 0x4;
126
127 /**
128 * Opens a zip file for reading.
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
132 * to 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 name the name of the zip file
138 * @throws ZipException if a ZIP format error has occurred
139 * @throws IOException if an I/O error has occurred
140 * @throws SecurityException if a security manager exists and its
141 * {@code checkRead} method doesn't allow read access to the file.
142 *
143 * @see SecurityManager#checkRead(java.lang.String)
144 */
145 public ZipFile(String name) throws IOException {
146 this(new File(name), OPEN_READ);
147 }
148
149 /**
150 * Opens a new {@code ZipFile} to read from the specified
151 * {@code File} object in the specified mode. The mode argument
152 * must be either {@code OPEN_READ} or {@code OPEN_READ | OPEN_DELETE}.
153 *
154 * <p>First, if there is a security manager, its {@code checkRead}
155 * method is called with the {@code name} argument as its argument to
156 * ensure the read is allowed.
157 *
158 * <p>The UTF-8 {@link java.nio.charset.Charset charset} is used to
159 * decode the entry names and comments
160 *
161 * @param file the ZIP file to be opened for reading
162 * @param mode the mode in which the file is to be opened
163 * @throws ZipException if a ZIP format error has occurred
164 * @throws IOException if an I/O error has occurred
165 * @throws SecurityException if a security manager exists and
166 * its {@code checkRead} method
167 * doesn't allow read access to the file,
168 * or its {@code checkDelete} method doesn't allow deleting
169 * the file when the {@code OPEN_DELETE} flag is set.
170 * @throws IllegalArgumentException if the {@code mode} argument is invalid
171 * @see SecurityManager#checkRead(java.lang.String)
172 * @since 1.3
173 */
174 public ZipFile(File file, int mode) throws IOException {
175 this(file, mode, StandardCharsets.UTF_8);
176 }
177
178 /**
179 * Opens a ZIP file for reading given the specified File object.
180 *
181 * <p>The UTF-8 {@link java.nio.charset.Charset charset} is used to
182 * decode the entry names and comments.
183 *
184 * @param file the ZIP file to be opened for reading
185 * @throws ZipException if a ZIP format error has occurred
186 * @throws IOException if an I/O error has occurred
187 */
188 public ZipFile(File file) throws ZipException, IOException {
189 this(file, OPEN_READ);
190 }
191
192 /**
193 * Opens a new {@code ZipFile} to read from the specified
194 * {@code File} object in the specified mode. The mode argument
195 * must be either {@code OPEN_READ} or {@code OPEN_READ | OPEN_DELETE}.
196 *
197 * <p>First, if there is a security manager, its {@code checkRead}
198 * method is called with the {@code name} argument as its argument to
199 * ensure the read is allowed.
200 *
201 * @param file the ZIP file to be opened for reading
202 * @param mode the mode in which the file is to be opened
203 * @param charset
204 * the {@linkplain java.nio.charset.Charset charset} to
205 * be used to decode the ZIP entry name and comment that are not
206 * encoded by using UTF-8 encoding (indicated by entry's general
207 * purpose flag).
208 *
209 * @throws ZipException if a ZIP format error has occurred
210 * @throws IOException if an I/O error has occurred
211 *
212 * @throws SecurityException
213 * if a security manager exists and its {@code checkRead}
214 * method doesn't allow read access to the file,or its
215 * {@code checkDelete} method doesn't allow deleting the
216 * file when the {@code OPEN_DELETE} flag is set
217 *
218 * @throws IllegalArgumentException if the {@code mode} argument is invalid
219 *
220 * @see SecurityManager#checkRead(java.lang.String)
221 *
222 * @since 1.7
223 */
224 public ZipFile(File file, int mode, Charset charset) throws IOException
225 {
226 if (((mode & OPEN_READ) == 0) ||
227 ((mode & ~(OPEN_READ | OPEN_DELETE)) != 0)) {
228 throw new IllegalArgumentException("Illegal mode: 0x"+
229 Integer.toHexString(mode));
230 }
231 String name = file.getPath();
232 SecurityManager sm = System.getSecurityManager();
233 if (sm != null) {
234 sm.checkRead(name);
235 if ((mode & OPEN_DELETE) != 0) {
236 sm.checkDelete(name);
237 }
238 }
239 Objects.requireNonNull(charset, "charset");
240
241 this.zc = ZipCoder.get(charset);
242 this.name = name;
243 long t0 = System.nanoTime();
244
245 this.res = CleanableResource.get(this, file, mode);
246
247 PerfCounter.getZipFileOpenTime().addElapsedTimeFrom(t0);
248 PerfCounter.getZipFileCount().increment();
249 }
250
251 /**
252 * Opens a zip file for reading.
253 *
254 * <p>First, if there is a security manager, its {@code checkRead}
255 * method is called with the {@code name} argument as its argument
256 * to ensure the read is allowed.
257 *
258 * @param name the name of the zip file
259 * @param charset
260 * the {@linkplain java.nio.charset.Charset charset} to
261 * be used to decode the ZIP entry name and comment that are not
262 * encoded by using UTF-8 encoding (indicated by entry's general
263 * purpose flag).
264 *
265 * @throws ZipException if a ZIP format error has occurred
266 * @throws IOException if an I/O error has occurred
267 * @throws SecurityException
268 * if a security manager exists and its {@code checkRead}
269 * method doesn't allow read access to the file
270 *
271 * @see SecurityManager#checkRead(java.lang.String)
272 *
273 * @since 1.7
274 */
275 public ZipFile(String name, Charset charset) throws IOException
276 {
277 this(new File(name), OPEN_READ, charset);
278 }
279
280 /**
281 * Opens a ZIP file for reading given the specified File object.
282 *
283 * @param file the ZIP file to be opened for reading
284 * @param charset
285 * The {@linkplain java.nio.charset.Charset charset} to be
286 * used to decode the ZIP entry name and comment (ignored if
287 * the <a href="package-summary.html#lang_encoding"> language
288 * encoding bit</a> of the ZIP entry's general purpose bit
289 * flag is set).
290 *
291 * @throws ZipException if a ZIP format error has occurred
292 * @throws IOException if an I/O error has occurred
293 *
294 * @since 1.7
295 */
296 public ZipFile(File file, Charset charset) throws IOException
297 {
298 this(file, OPEN_READ, charset);
299 }
300
301 /**
302 * Returns the zip file comment, or null if none.
303 *
304 * @return the comment string for the zip file, or null if none
305 *
306 * @throws IllegalStateException if the zip file has been closed
307 *
308 * @since 1.7
309 */
310 public String getComment() {
311 synchronized (this) {
312 ensureOpen();
313 if (res.zsrc.comment == null) {
314 return null;
315 }
316 return zc.toString(res.zsrc.comment);
317 }
318 }
319
320 /**
321 * Returns the zip file entry for the specified name, or null
322 * if not found.
323 *
324 * @param name the name of the entry
325 * @return the zip file entry, or null if not found
326 * @throws IllegalStateException if the zip file has been closed
327 */
328 public ZipEntry getEntry(String name) {
329 return getEntry(name, ZipEntry::new);
330 }
331
332 /*
333 * Returns the zip file entry for the specified name, or null
334 * if not found.
335 *
336 * @param name the name of the entry
337 * @param func the function that creates the returned entry
338 *
339 * @return the zip file entry, or null if not found
340 * @throws IllegalStateException if the zip file has been closed
341 */
342 private ZipEntry getEntry(String name, Function<String, ? extends ZipEntry> func) {
343 Objects.requireNonNull(name, "name");
344 synchronized (this) {
345 ensureOpen();
346 byte[] bname = zc.getBytes(name);
347 int pos = res.zsrc.getEntryPos(bname, true);
348 if (pos != -1) {
349 return getZipEntry(name, bname, pos, func);
350 }
351 }
352 return null;
353 }
354
355 /**
356 * Returns an input stream for reading the contents of the specified
357 * zip file entry.
358 * <p>
359 * Closing this ZIP file will, in turn, close all input streams that
360 * have been returned by invocations of this method.
361 *
362 * @param entry the zip file entry
363 * @return the input stream for reading the contents of the specified
364 * zip file entry.
365 * @throws ZipException if a ZIP format error has occurred
366 * @throws IOException if an I/O error has occurred
367 * @throws IllegalStateException if the zip file has been closed
368 */
369 public InputStream getInputStream(ZipEntry entry) throws IOException {
370 Objects.requireNonNull(entry, "entry");
371 int pos = -1;
372 ZipFileInputStream in = null;
373 Source zsrc = res.zsrc;
374 Set<InputStream> istreams = res.istreams;
375 synchronized (this) {
376 ensureOpen();
377 if (Objects.equals(lastEntryName, entry.name)) {
378 pos = lastEntryPos;
379 } else if (!zc.isUTF8() && (entry.flag & EFS) != 0) {
380 pos = zsrc.getEntryPos(zc.getBytesUTF8(entry.name), false);
381 } else {
382 pos = zsrc.getEntryPos(zc.getBytes(entry.name), false);
383 }
384 if (pos == -1) {
385 return null;
386 }
387 in = new ZipFileInputStream(zsrc.cen, pos);
388 switch (CENHOW(zsrc.cen, pos)) {
389 case STORED:
390 synchronized (istreams) {
391 istreams.add(in);
392 }
393 return in;
394 case DEFLATED:
395 // Inflater likes a bit of slack
396 // MORE: Compute good size for inflater stream:
397 long size = CENLEN(zsrc.cen, pos) + 2;
398 if (size > 65536) {
399 size = 8192;
400 }
401 if (size <= 0) {
402 size = 4096;
403 }
404 InputStream is = new ZipFileInflaterInputStream(in, res, (int)size);
405 synchronized (istreams) {
406 istreams.add(is);
407 }
408 return is;
409 default:
410 throw new ZipException("invalid compression method");
411 }
412 }
413 }
414
415 private static class InflaterCleanupAction implements Runnable {
416 private final Inflater inf;
417 private final CleanableResource res;
418
419 InflaterCleanupAction(Inflater inf, CleanableResource res) {
420 this.inf = inf;
421 this.res = res;
422 }
423
424 @Override
425 public void run() {
426 res.releaseInflater(inf);
427 }
428 }
429
430 private class ZipFileInflaterInputStream extends InflaterInputStream {
431 private volatile boolean closeRequested;
432 private boolean eof = false;
433 private final Cleanable cleanable;
434
435 ZipFileInflaterInputStream(ZipFileInputStream zfin,
436 CleanableResource res, int size) {
437 this(zfin, res, res.getInflater(), size);
438 }
439
440 private ZipFileInflaterInputStream(ZipFileInputStream zfin,
441 CleanableResource res,
442 Inflater inf, int size) {
443 super(zfin, inf, size);
444 this.cleanable = CleanerFactory.cleaner().register(this,
445 new InflaterCleanupAction(inf, res));
446 }
447
448 public void close() throws IOException {
449 if (closeRequested)
450 return;
451 closeRequested = true;
452 super.close();
453 synchronized (res.istreams) {
454 res.istreams.remove(this);
455 }
456 cleanable.clean();
457 }
458
459 // Override fill() method to provide an extra "dummy" byte
460 // at the end of the input stream. This is required when
461 // using the "nowrap" Inflater option.
462 protected void fill() throws IOException {
463 if (eof) {
464 throw new EOFException("Unexpected end of ZLIB input stream");
465 }
466 len = in.read(buf, 0, buf.length);
467 if (len == -1) {
468 buf[0] = 0;
469 len = 1;
470 eof = true;
471 }
472 inf.setInput(buf, 0, len);
473 }
474
475 public int available() throws IOException {
476 if (closeRequested)
477 return 0;
478 long avail = ((ZipFileInputStream)in).size() - inf.getBytesWritten();
479 return (avail > (long) Integer.MAX_VALUE ?
480 Integer.MAX_VALUE : (int) avail);
481 }
482 }
483
484 /**
485 * Returns the path name of the ZIP file.
486 * @return the path name of the ZIP file
487 */
488 public String getName() {
489 return name;
490 }
491
492 private class ZipEntryIterator<T extends ZipEntry>
493 implements Enumeration<T>, Iterator<T> {
494
495 private int i = 0;
496 private final int entryCount;
497 private final Function<String, T> gen;
498
499 public ZipEntryIterator(int entryCount, Function<String, T> gen) {
500 this.entryCount = entryCount;
501 this.gen = gen;
502 }
503
504 @Override
505 public boolean hasMoreElements() {
506 return hasNext();
507 }
508
509 @Override
510 public boolean hasNext() {
511 return i < entryCount;
512 }
513
514 @Override
515 public T nextElement() {
516 return next();
517 }
518
519 @Override
520 @SuppressWarnings("unchecked")
521 public T next() {
522 synchronized (ZipFile.this) {
523 ensureOpen();
524 if (!hasNext()) {
525 throw new NoSuchElementException();
526 }
527 // each "entry" has 3 ints in table entries
528 return (T)getZipEntry(null, null, res.zsrc.getEntryPos(i++ * 3), gen);
529 }
530 }
531
532 @Override
533 public Iterator<T> asIterator() {
534 return this;
535 }
536 }
537
538 /**
539 * Returns an enumeration of the ZIP file entries.
540 * @return an enumeration of the ZIP file entries
541 * @throws IllegalStateException if the zip file has been closed
542 */
543 public Enumeration<? extends ZipEntry> entries() {
544 synchronized (this) {
545 ensureOpen();
546 return new ZipEntryIterator<ZipEntry>(res.zsrc.total, ZipEntry::new);
547 }
548 }
549
550 private Enumeration<JarEntry> entries(Function<String, JarEntry> func) {
551 synchronized (this) {
552 ensureOpen();
553 return new ZipEntryIterator<JarEntry>(res.zsrc.total, func);
554 }
555 }
556
557 private class EntrySpliterator<T> extends Spliterators.AbstractSpliterator<T> {
558 private int index;
559 private final int fence;
560 private final IntFunction<T> gen;
561
562 EntrySpliterator(int index, int fence, IntFunction<T> gen) {
563 super((long)fence,
564 Spliterator.ORDERED | Spliterator.DISTINCT | Spliterator.IMMUTABLE |
565 Spliterator.NONNULL);
566 this.index = index;
567 this.fence = fence;
568 this.gen = gen;
569 }
570
571 @Override
572 public boolean tryAdvance(Consumer<? super T> action) {
573 if (action == null)
574 throw new NullPointerException();
575 if (index >= 0 && index < fence) {
576 synchronized (ZipFile.this) {
577 ensureOpen();
578 action.accept(gen.apply(res.zsrc.getEntryPos(index++ * 3)));
579 }
580 return true;
581 }
582 return false;
583 }
584 }
585
586 /**
587 * Returns an ordered {@code Stream} over the ZIP file entries.
588 *
589 * Entries appear in the {@code Stream} in the order they appear in
590 * the central directory of the ZIP file.
591 *
592 * @return an ordered {@code Stream} of entries in this ZIP file
593 * @throws IllegalStateException if the zip file has been closed
594 * @since 1.8
595 */
596 public Stream<? extends ZipEntry> stream() {
597 synchronized (this) {
598 ensureOpen();
599 return StreamSupport.stream(new EntrySpliterator<>(0, res.zsrc.total,
600 pos -> getZipEntry(null, null, pos, ZipEntry::new)), false);
601 }
602 }
603
604 private String getEntryName(int pos) {
605 byte[] cen = res.zsrc.cen;
606 int nlen = CENNAM(cen, pos);
607 int clen = CENCOM(cen, pos);
608 int flag = CENFLG(cen, pos);
609 if (!zc.isUTF8() && (flag & EFS) != 0) {
610 return zc.toStringUTF8(cen, pos + CENHDR, nlen);
611 } else {
612 return zc.toString(cen, pos + CENHDR, nlen);
613 }
614 }
615
616 /*
617 * Returns an ordered {@code Stream} over the zip file entry names.
618 *
619 * Entry names appear in the {@code Stream} in the order they appear in
620 * the central directory of the ZIP file.
621 *
622 * @return an ordered {@code Stream} of entry names in this zip file
623 * @throws IllegalStateException if the zip file has been closed
624 * @since 10
625 */
626 private Stream<String> entryNameStream() {
627 synchronized (this) {
628 ensureOpen();
629 return StreamSupport.stream(
630 new EntrySpliterator<>(0, res.zsrc.total, this::getEntryName), false);
631 }
632 }
633
634 /*
635 * Returns an ordered {@code Stream} over the zip file entries.
636 *
637 * Entries appear in the {@code Stream} in the order they appear in
638 * the central directory of the jar file.
639 *
640 * @param func the function that creates the returned entry
641 * @return an ordered {@code Stream} of entries in this zip file
642 * @throws IllegalStateException if the zip file has been closed
643 * @since 10
644 */
645 private Stream<JarEntry> stream(Function<String, JarEntry> func) {
646 synchronized (this) {
647 ensureOpen();
648 return StreamSupport.stream(new EntrySpliterator<>(0, res.zsrc.total,
649 pos -> (JarEntry)getZipEntry(null, null, pos, func)), false);
650 }
651 }
652
653 private String lastEntryName;
654 private int lastEntryPos;
655
656 /* Checks ensureOpen() before invoke this method */
657 private ZipEntry getZipEntry(String name, byte[] bname, int pos,
658 Function<String, ? extends ZipEntry> func) {
659 byte[] cen = res.zsrc.cen;
660 int nlen = CENNAM(cen, pos);
661 int elen = CENEXT(cen, pos);
662 int clen = CENCOM(cen, pos);
663 int flag = CENFLG(cen, pos);
664 if (name == null || bname.length != nlen) {
665 // to use the entry name stored in cen, if the passed in name is
666 // (1) null, invoked from iterator, or
667 // (2) not equal to the name stored, a slash is appended during
668 // getEntryPos() search.
669 if (!zc.isUTF8() && (flag & EFS) != 0) {
670 name = zc.toStringUTF8(cen, pos + CENHDR, nlen);
671 } else {
672 name = zc.toString(cen, pos + CENHDR, nlen);
673 }
674 }
675 ZipEntry e = func.apply(name); //ZipEntry e = new ZipEntry(name);
676 e.flag = flag;
677 e.xdostime = CENTIM(cen, pos);
678 e.crc = CENCRC(cen, pos);
679 e.size = CENLEN(cen, pos);
680 e.csize = CENSIZ(cen, pos);
681 e.method = CENHOW(cen, pos);
682 if (elen != 0) {
683 int start = pos + CENHDR + nlen;
684 e.setExtra0(Arrays.copyOfRange(cen, start, start + elen), true);
685 }
686 if (clen != 0) {
687 int start = pos + CENHDR + nlen + elen;
688 if (!zc.isUTF8() && (flag & EFS) != 0) {
689 e.comment = zc.toStringUTF8(cen, start, clen);
690 } else {
691 e.comment = zc.toString(cen, start, clen);
692 }
693 }
694 lastEntryName = e.name;
695 lastEntryPos = pos;
696 return e;
697 }
698
699 /**
700 * Returns the number of entries in the ZIP file.
701 *
702 * @return the number of entries in the ZIP file
703 * @throws IllegalStateException if the zip file has been closed
704 */
705 public int size() {
706 synchronized (this) {
707 ensureOpen();
708 return res.zsrc.total;
709 }
710 }
711
712 private static class CleanableResource implements Runnable {
713 // The outstanding inputstreams that need to be closed
714 final Set<InputStream> istreams;
715
716 // List of cached Inflater objects for decompression
717 Deque<Inflater> inflaterCache;
718
719 final Cleanable cleanable;
720
721 Source zsrc;
722
723 CleanableResource(ZipFile zf, File file, int mode) throws IOException {
724 this.cleanable = CleanerFactory.cleaner().register(zf, this);
725 this.istreams = Collections.newSetFromMap(new WeakHashMap<>());
726 this.inflaterCache = new ArrayDeque<>();
727 this.zsrc = Source.get(file, (mode & OPEN_DELETE) != 0);
728 }
729
730 void clean() {
731 cleanable.clean();
732 }
733
734 /*
735 * Gets an inflater from the list of available inflaters or allocates
736 * a new one.
737 */
738 Inflater getInflater() {
739 Inflater inf;
740 synchronized (inflaterCache) {
741 if ((inf = inflaterCache.poll()) != null) {
742 return inf;
743 }
744 }
745 return new Inflater(true);
746 }
747
748 /*
749 * Releases the specified inflater to the list of available inflaters.
750 */
751 void releaseInflater(Inflater inf) {
752 Deque<Inflater> inflaters = this.inflaterCache;
753 if (inflaters != null) {
754 synchronized (inflaters) {
755 // double checked!
756 if (inflaters == this.inflaterCache) {
757 inf.reset();
758 inflaters.add(inf);
759 return;
760 }
761 }
762 }
763 // inflaters cache already closed - just end it.
764 inf.end();
765 }
766
767 public void run() {
768 IOException ioe = null;
769
770 // Release cached inflaters and close the cache first
771 Deque<Inflater> inflaters = this.inflaterCache;
772 if (inflaters != null) {
773 synchronized (inflaters) {
774 // no need to double-check as only one thread gets a
775 // chance to execute run() (Cleaner guarantee)...
776 Inflater inf;
777 while ((inf = inflaters.poll()) != null) {
778 inf.end();
779 }
780 // close inflaters cache
781 this.inflaterCache = null;
782 }
783 }
784
785 // Close streams, release their inflaters
786 if (istreams != null) {
787 synchronized (istreams) {
788 if (!istreams.isEmpty()) {
789 InputStream[] copy = istreams.toArray(new InputStream[0]);
790 istreams.clear();
791 for (InputStream is : copy) {
792 try {
793 is.close();
794 } catch (IOException e) {
795 if (ioe == null) ioe = e;
796 else ioe.addSuppressed(e);
797 }
798 }
799 }
800 }
801 }
802
803 // Release zip src
804 if (zsrc != null) {
805 synchronized (zsrc) {
806 try {
807 Source.release(zsrc);
808 zsrc = null;
809 } catch (IOException e) {
810 if (ioe == null) ioe = e;
811 else ioe.addSuppressed(e);
812 }
813 }
814 }
815 if (ioe != null) {
816 throw new UncheckedIOException(ioe);
817 }
818 }
819
820 CleanableResource(File file, int mode)
821 throws IOException {
822 this.cleanable = null;
823 this.istreams = Collections.newSetFromMap(new WeakHashMap<>());
824 this.inflaterCache = new ArrayDeque<>();
825 this.zsrc = Source.get(file, (mode & OPEN_DELETE) != 0);
826 }
827
828 /*
829 * If {@code ZipFile} has been subclassed and the {@code close} method is
830 * overridden, uses the {@code finalizer} mechanism for resource cleanup.
831 * So {@code close} method can be called when the the {@code ZipFile} is
832 * unreachable. This mechanism will be removed when {@code finalize} method
833 * is removed from {@code ZipFile}.
834 */
835 static CleanableResource get(ZipFile zf, File file, int mode)
836 throws IOException {
837 Class<?> clz = zf.getClass();
838 while (clz != ZipFile.class) {
839 try {
840 clz.getDeclaredMethod("close");
841 return new FinalizableResource(zf, file, mode);
842 } catch (NoSuchMethodException nsme) {}
843 clz = clz.getSuperclass();
844 }
845 return new CleanableResource(zf, file, mode);
846 }
847
848 static class FinalizableResource extends CleanableResource {
849 ZipFile zf;
850 FinalizableResource(ZipFile zf, File file, int mode)
851 throws IOException {
852 super(file, mode);
853 this.zf = zf;
854 }
855
856 @Override
857 void clean() {
858 run();
859 }
860
861 @Override
862 @SuppressWarnings("deprecation")
863 protected void finalize() throws IOException {
864 zf.close();
865 }
866 }
867 }
868
869 /**
870 * Closes the ZIP file.
871 *
872 * <p> Closing this ZIP file will close all of the input streams
873 * previously returned by invocations of the {@link #getInputStream
874 * getInputStream} method.
875 *
876 * @throws IOException if an I/O error has occurred
877 */
878 public void close() throws IOException {
879 if (closeRequested) {
880 return;
881 }
882 closeRequested = true;
883
884 synchronized (this) {
885 // Close streams, release their inflaters, release cached inflaters
886 // and release zip source
887 try {
888 res.clean();
889 } catch (UncheckedIOException ioe) {
890 throw ioe.getCause();
891 }
892 }
893 }
894
895 /**
896 * Ensures that the system resources held by this ZipFile object are
897 * released when there are no more references to it.
898 *
899 * @deprecated The {@code finalize} method has been deprecated and will be
900 * removed. It is implemented as a no-op. Subclasses that override
901 * {@code finalize} in order to perform cleanup should be modified to
902 * use alternative cleanup mechanisms and to remove the overriding
903 * {@code finalize} method. The recommended cleanup for ZipFile object
904 * is to explicitly invoke {@code close} method when it is no longer in
905 * use, or use try-with-resources. If the {@code close} is not invoked
906 * explicitly the resources held by this object will be released when
907 * the instance becomes unreachable.
908 *
909 * @throws IOException if an I/O error has occurred
910 */
911 @Deprecated(since="9", forRemoval=true)
912 protected void finalize() throws IOException {}
913
914 private void ensureOpen() {
915 if (closeRequested) {
916 throw new IllegalStateException("zip file closed");
917 }
918 if (res.zsrc == null) {
919 throw new IllegalStateException("The object is not initialized.");
920 }
921 }
922
923 private void ensureOpenOrZipException() throws IOException {
924 if (closeRequested) {
925 throw new ZipException("ZipFile closed");
926 }
927 }
928
929 /*
930 * Inner class implementing the input stream used to read a
931 * (possibly compressed) zip file entry.
932 */
933 private class ZipFileInputStream extends InputStream {
934 private volatile boolean closeRequested;
935 private long pos; // current position within entry data
936 protected long rem; // number of remaining bytes within entry
937 protected long size; // uncompressed size of this entry
938
939 ZipFileInputStream(byte[] cen, int cenpos) {
940 rem = CENSIZ(cen, cenpos);
941 size = CENLEN(cen, cenpos);
942 pos = CENOFF(cen, cenpos);
943 // zip64
944 if (rem == ZIP64_MAGICVAL || size == ZIP64_MAGICVAL ||
945 pos == ZIP64_MAGICVAL) {
946 checkZIP64(cen, cenpos);
947 }
948 // negative for lazy initialization, see getDataOffset();
949 pos = - (pos + ZipFile.this.res.zsrc.locpos);
950 }
951
952 private void checkZIP64(byte[] cen, int cenpos) {
953 int off = cenpos + CENHDR + CENNAM(cen, cenpos);
954 int end = off + CENEXT(cen, cenpos);
955 while (off + 4 < end) {
956 int tag = get16(cen, off);
957 int sz = get16(cen, off + 2);
958 off += 4;
959 if (off + sz > end) // invalid data
960 break;
961 if (tag == EXTID_ZIP64) {
962 if (size == ZIP64_MAGICVAL) {
963 if (sz < 8 || (off + 8) > end)
964 break;
965 size = get64(cen, off);
966 sz -= 8;
967 off += 8;
968 }
969 if (rem == ZIP64_MAGICVAL) {
970 if (sz < 8 || (off + 8) > end)
971 break;
972 rem = get64(cen, off);
973 sz -= 8;
974 off += 8;
975 }
976 if (pos == ZIP64_MAGICVAL) {
977 if (sz < 8 || (off + 8) > end)
978 break;
979 pos = get64(cen, off);
980 sz -= 8;
981 off += 8;
982 }
983 break;
984 }
985 off += sz;
986 }
987 }
988
989 /* The Zip file spec explicitly allows the LOC extra data size to
990 * be different from the CEN extra data size. Since we cannot trust
991 * the CEN extra data size, we need to read the LOC to determine
992 * the entry data offset.
993 */
994 private long initDataOffset() throws IOException {
995 if (pos <= 0) {
996 byte[] loc = new byte[LOCHDR];
997 pos = -pos;
998 int len = ZipFile.this.res.zsrc.readFullyAt(loc, 0, loc.length, pos);
999 if (len != LOCHDR) {
1000 throw new ZipException("ZipFile error reading zip file");
1001 }
1002 if (LOCSIG(loc) != LOCSIG) {
1003 throw new ZipException("ZipFile invalid LOC header (bad signature)");
1004 }
1005 pos += LOCHDR + LOCNAM(loc) + LOCEXT(loc);
1006 }
1007 return pos;
1008 }
1009
1010 public int read(byte b[], int off, int len) throws IOException {
1011 synchronized (ZipFile.this) {
1012 ensureOpenOrZipException();
1013 initDataOffset();
1014 if (rem == 0) {
1015 return -1;
1016 }
1017 if (len > rem) {
1018 len = (int) rem;
1019 }
1020 if (len <= 0) {
1021 return 0;
1022 }
1023 len = ZipFile.this.res.zsrc.readAt(b, off, len, pos);
1024 if (len > 0) {
1025 pos += len;
1026 rem -= len;
1027 }
1028 }
1029 if (rem == 0) {
1030 close();
1031 }
1032 return len;
1033 }
1034
1035 public int read() throws IOException {
1036 byte[] b = new byte[1];
1037 if (read(b, 0, 1) == 1) {
1038 return b[0] & 0xff;
1039 } else {
1040 return -1;
1041 }
1042 }
1043
1044 public long skip(long n) throws IOException {
1045 synchronized (ZipFile.this) {
1046 initDataOffset();
1047 if (n > rem) {
1048 n = rem;
1049 }
1050 pos += n;
1051 rem -= n;
1052 }
1053 if (rem == 0) {
1054 close();
1055 }
1056 return n;
1057 }
1058
1059 public int available() {
1060 return rem > Integer.MAX_VALUE ? Integer.MAX_VALUE : (int) rem;
1061 }
1062
1063 public long size() {
1064 return size;
1065 }
1066
1067 public void close() {
1068 if (closeRequested) {
1069 return;
1070 }
1071 closeRequested = true;
1072 rem = 0;
1073 synchronized (res.istreams) {
1074 res.istreams.remove(this);
1075 }
1076 }
1077
1078 }
1079
1080 /**
1081 * Returns the names of all non-directory entries that begin with
1082 * "META-INF/" (case ignored). This method is used in JarFile, via
1083 * SharedSecrets, as an optimization when looking up manifest and
1084 * signature file entries. Returns null if no entries were found.
1085 */
1086 private String[] getMetaInfEntryNames() {
1087 synchronized (this) {
1088 ensureOpen();
1089 Source zsrc = res.zsrc;
1090 if (zsrc.metanames == null) {
1091 return null;
1092 }
1093 String[] names = new String[zsrc.metanames.length];
1094 byte[] cen = zsrc.cen;
1095 for (int i = 0; i < names.length; i++) {
1096 int pos = zsrc.metanames[i];
1097 names[i] = new String(cen, pos + CENHDR, CENNAM(cen, pos),
1098 StandardCharsets.UTF_8);
1099 }
1100 return names;
1101 }
1102 }
1103
1104 private static boolean isWindows;
1105 static {
1106 SharedSecrets.setJavaUtilZipFileAccess(
1107 new JavaUtilZipFileAccess() {
1108 @Override
1109 public boolean startsWithLocHeader(ZipFile zip) {
1110 return zip.res.zsrc.startsWithLoc;
1111 }
1112 @Override
1113 public String[] getMetaInfEntryNames(ZipFile zip) {
1114 return zip.getMetaInfEntryNames();
1115 }
1116 @Override
1117 public JarEntry getEntry(ZipFile zip, String name,
1118 Function<String, JarEntry> func) {
1119 return (JarEntry)zip.getEntry(name, func);
1120 }
1121 @Override
1122 public Enumeration<JarEntry> entries(ZipFile zip,
1123 Function<String, JarEntry> func) {
1124 return zip.entries(func);
1125 }
1126 @Override
1127 public Stream<JarEntry> stream(ZipFile zip,
1128 Function<String, JarEntry> func) {
1129 return zip.stream(func);
1130 }
1131 @Override
1132 public Stream<String> entryNameStream(ZipFile zip) {
1133 return zip.entryNameStream();
1134 }
1135 }
1136 );
1137 isWindows = VM.getSavedProperty("os.name").contains("Windows");
1138 }
1139
1140 private static class Source {
1141 private final Key key; // the key in files
1142 private int refs = 1;
1143
1144 private RandomAccessFile zfile; // zfile of the underlying zip file
1145 private byte[] cen; // CEN & ENDHDR
1146 private long locpos; // position of first LOC header (usually 0)
1147 private byte[] comment; // zip file comment
1148 // list of meta entries in META-INF dir
1149 private int[] metanames;
1150 private final boolean startsWithLoc; // true, if zip file starts with LOCSIG (usually true)
1151
1152 // A Hashmap for all entries.
1153 //
1154 // A cen entry of Zip/JAR file. As we have one for every entry in every active Zip/JAR,
1155 // We might have a lot of these in a typical system. In order to save space we don't
1156 // keep the name in memory, but merely remember a 32 bit {@code hash} value of the
1157 // entry name and its offset {@code pos} in the central directory hdeader.
1158 //
1159 // private static class Entry {
1160 // int hash; // 32 bit hashcode on name
1161 // int next; // hash chain: index into entries
1162 // int pos; // Offset of central directory file header
1163 // }
1164 // private Entry[] entries; // array of hashed cen entry
1165 //
1166 // To reduce the total size of entries further, we use a int[] here to store 3 "int"
1167 // {@code hash}, {@code next and {@code "pos for each entry. The entry can then be
1168 // referred by their index of their positions in the {@code entries}.
1169 //
1170 private int[] entries; // array of hashed cen entry
1171 private int addEntry(int index, int hash, int next, int pos) {
1172 entries[index++] = hash;
1173 entries[index++] = next;
1174 entries[index++] = pos;
1175 return index;
1176 }
1177 private int getEntryHash(int index) { return entries[index]; }
1178 private int getEntryNext(int index) { return entries[index + 1]; }
1179 private int getEntryPos(int index) { return entries[index + 2]; }
1180 private static final int ZIP_ENDCHAIN = -1;
1181 private int total; // total number of entries
1182 private int[] table; // Hash chain heads: indexes into entries
1183 private int tablelen; // number of hash heads
1184
1185 private static class Key {
1186 BasicFileAttributes attrs;
1187 File file;
1188
1189 public Key(File file, BasicFileAttributes attrs) {
1190 this.attrs = attrs;
1191 this.file = file;
1192 }
1193
1194 public int hashCode() {
1195 long t = attrs.lastModifiedTime().toMillis();
1196 return ((int)(t ^ (t >>> 32))) + file.hashCode();
1197 }
1198
1199 public boolean equals(Object obj) {
1200 if (obj instanceof Key) {
1201 Key key = (Key)obj;
1202 if (!attrs.lastModifiedTime().equals(key.attrs.lastModifiedTime())) {
1203 return false;
1204 }
1205 Object fk = attrs.fileKey();
1206 if (fk != null) {
1207 return fk.equals(key.attrs.fileKey());
1208 } else {
1209 return file.equals(key.file);
1210 }
1211 }
1212 return false;
1213 }
1214 }
1215 private static final HashMap<Key, Source> files = new HashMap<>();
1216
1217
1218 static Source get(File file, boolean toDelete) throws IOException {
1219 Key key = new Key(file,
1220 Files.readAttributes(file.toPath(), BasicFileAttributes.class));
1221 Source src = null;
1222 synchronized (files) {
1223 src = files.get(key);
1224 if (src != null) {
1225 src.refs++;
1226 return src;
1227 }
1228 }
1229 src = new Source(key, toDelete);
1230
1231 synchronized (files) {
1232 if (files.containsKey(key)) { // someone else put in first
1233 src.close(); // close the newly created one
1234 src = files.get(key);
1235 src.refs++;
1236 return src;
1237 }
1238 files.put(key, src);
1239 return src;
1240 }
1241 }
1242
1243 static void release(Source src) throws IOException {
1244 synchronized (files) {
1245 if (src != null && --src.refs == 0) {
1246 files.remove(src.key);
1247 src.close();
1248 }
1249 }
1250 }
1251
1252 private Source(Key key, boolean toDelete) throws IOException {
1253 this.key = key;
1254 if (toDelete) {
1255 if (isWindows) {
1256 this.zfile = SharedSecrets.getJavaIORandomAccessFileAccess()
1257 .openAndDelete(key.file, "r");
1258 } else {
1259 this.zfile = new RandomAccessFile(key.file, "r");
1260 key.file.delete();
1261 }
1262 } else {
1263 this.zfile = new RandomAccessFile(key.file, "r");
1264 }
1265 try {
1266 initCEN(-1);
1267 byte[] buf = new byte[4];
1268 readFullyAt(buf, 0, 4, 0);
1269 this.startsWithLoc = (LOCSIG(buf) == LOCSIG);
1270 } catch (IOException x) {
1271 try {
1272 this.zfile.close();
1273 } catch (IOException xx) {}
1274 throw x;
1275 }
1276 }
1277
1278 private void close() throws IOException {
1279 zfile.close();
1280 zfile = null;
1281 cen = null;
1282 entries = null;
1283 table = null;
1284 metanames = null;
1285 }
1286
1287 private static final int BUF_SIZE = 8192;
1288 private final int readFullyAt(byte[] buf, int off, int len, long pos)
1289 throws IOException
1290 {
1291 synchronized(zfile) {
1292 zfile.seek(pos);
1293 int N = len;
1294 while (N > 0) {
1295 int n = Math.min(BUF_SIZE, N);
1296 zfile.readFully(buf, off, n);
1297 off += n;
1298 N -= n;
1299 }
1300 return len;
1301 }
1302 }
1303
1304 private final int readAt(byte[] buf, int off, int len, long pos)
1305 throws IOException
1306 {
1307 synchronized(zfile) {
1308 zfile.seek(pos);
1309 return zfile.read(buf, off, len);
1310 }
1311 }
1312
1313 private static final int hashN(byte[] a, int off, int len) {
1314 int h = 1;
1315 while (len-- > 0) {
1316 h = 31 * h + a[off++];
1317 }
1318 return h;
1319 }
1320
1321 private static final int hash_append(int hash, byte b) {
1322 return hash * 31 + b;
1323 }
1324
1325 private static class End {
1326 int centot; // 4 bytes
1327 long cenlen; // 4 bytes
1328 long cenoff; // 4 bytes
1329 long endpos; // 4 bytes
1330 }
1331
1332 /*
1333 * Searches for end of central directory (END) header. The contents of
1334 * the END header will be read and placed in endbuf. Returns the file
1335 * position of the END header, otherwise returns -1 if the END header
1336 * was not found or an error occurred.
1337 */
1338 private End findEND() throws IOException {
1339 long ziplen = zfile.length();
1340 if (ziplen <= 0)
1341 zerror("zip file is empty");
1342 End end = new End();
1343 byte[] buf = new byte[READBLOCKSZ];
1344 long minHDR = (ziplen - END_MAXLEN) > 0 ? ziplen - END_MAXLEN : 0;
1345 long minPos = minHDR - (buf.length - ENDHDR);
1346 for (long pos = ziplen - buf.length; pos >= minPos; pos -= (buf.length - ENDHDR)) {
1347 int off = 0;
1348 if (pos < 0) {
1349 // Pretend there are some NUL bytes before start of file
1350 off = (int)-pos;
1351 Arrays.fill(buf, 0, off, (byte)0);
1352 }
1353 int len = buf.length - off;
1354 if (readFullyAt(buf, off, len, pos + off) != len ) {
1355 zerror("zip END header not found");
1356 }
1357 // Now scan the block backwards for END header signature
1358 for (int i = buf.length - ENDHDR; i >= 0; i--) {
1359 if (buf[i+0] == (byte)'P' &&
1360 buf[i+1] == (byte)'K' &&
1361 buf[i+2] == (byte)'\005' &&
1362 buf[i+3] == (byte)'\006') {
1363 // Found ENDSIG header
1364 byte[] endbuf = Arrays.copyOfRange(buf, i, i + ENDHDR);
1365 end.centot = ENDTOT(endbuf);
1366 end.cenlen = ENDSIZ(endbuf);
1367 end.cenoff = ENDOFF(endbuf);
1368 end.endpos = pos + i;
1369 int comlen = ENDCOM(endbuf);
1370 if (end.endpos + ENDHDR + comlen != ziplen) {
1371 // ENDSIG matched, however the size of file comment in it does
1372 // not match the real size. One "common" cause for this problem
1373 // is some "extra" bytes are padded at the end of the zipfile.
1374 // Let's do some extra verification, we don't care about the
1375 // performance in this situation.
1376 byte[] sbuf = new byte[4];
1377 long cenpos = end.endpos - end.cenlen;
1378 long locpos = cenpos - end.cenoff;
1379 if (cenpos < 0 ||
1380 locpos < 0 ||
1381 readFullyAt(sbuf, 0, sbuf.length, cenpos) != 4 ||
1382 GETSIG(sbuf) != CENSIG ||
1383 readFullyAt(sbuf, 0, sbuf.length, locpos) != 4 ||
1384 GETSIG(sbuf) != LOCSIG) {
1385 continue;
1386 }
1387 }
1388 if (comlen > 0) { // this zip file has comlen
1389 comment = new byte[comlen];
1390 if (readFullyAt(comment, 0, comlen, end.endpos + ENDHDR) != comlen) {
1391 zerror("zip comment read failed");
1392 }
1393 }
1394 // must check for a zip64 end record; it is always permitted to be present
1395 try {
1396 byte[] loc64 = new byte[ZIP64_LOCHDR];
1397 if (end.endpos < ZIP64_LOCHDR ||
1398 readFullyAt(loc64, 0, loc64.length, end.endpos - ZIP64_LOCHDR)
1399 != loc64.length || GETSIG(loc64) != ZIP64_LOCSIG) {
1400 return end;
1401 }
1402 long end64pos = ZIP64_LOCOFF(loc64);
1403 byte[] end64buf = new byte[ZIP64_ENDHDR];
1404 if (readFullyAt(end64buf, 0, end64buf.length, end64pos)
1405 != end64buf.length || GETSIG(end64buf) != ZIP64_ENDSIG) {
1406 return end;
1407 }
1408 // end64 candidate found,
1409 long cenlen64 = ZIP64_ENDSIZ(end64buf);
1410 long cenoff64 = ZIP64_ENDOFF(end64buf);
1411 long centot64 = ZIP64_ENDTOT(end64buf);
1412 // double-check
1413 if (cenlen64 != end.cenlen && end.cenlen != ZIP64_MAGICVAL ||
1414 cenoff64 != end.cenoff && end.cenoff != ZIP64_MAGICVAL ||
1415 centot64 != end.centot && end.centot != ZIP64_MAGICCOUNT) {
1416 return end;
1417 }
1418 // to use the end64 values
1419 end.cenlen = cenlen64;
1420 end.cenoff = cenoff64;
1421 end.centot = (int)centot64; // assume total < 2g
1422 end.endpos = end64pos;
1423 } catch (IOException x) {} // no zip64 loc/end
1424 return end;
1425 }
1426 }
1427 }
1428 zerror("zip END header not found");
1429 return null; //make compiler happy
1430 }
1431
1432 // Reads zip file central directory.
1433 private void initCEN(int knownTotal) throws IOException {
1434 if (knownTotal == -1) {
1435 End end = findEND();
1436 if (end.endpos == 0) {
1437 locpos = 0;
1438 total = 0;
1439 entries = new int[0];
1440 cen = null;
1441 return; // only END header present
1442 }
1443 if (end.cenlen > end.endpos)
1444 zerror("invalid END header (bad central directory size)");
1445 long cenpos = end.endpos - end.cenlen; // position of CEN table
1446 // Get position of first local file (LOC) header, taking into
1447 // account that there may be a stub prefixed to the zip file.
1448 locpos = cenpos - end.cenoff;
1449 if (locpos < 0) {
1450 zerror("invalid END header (bad central directory offset)");
1451 }
1452 // read in the CEN and END
1453 cen = new byte[(int)(end.cenlen + ENDHDR)];
1454 if (readFullyAt(cen, 0, cen.length, cenpos) != end.cenlen + ENDHDR) {
1455 zerror("read CEN tables failed");
1456 }
1457 total = end.centot;
1458 } else {
1459 total = knownTotal;
1460 }
1461 // hash table for entries
1462 entries = new int[total * 3];
1463 tablelen = ((total/2) | 1); // Odd -> fewer collisions
1464 table = new int[tablelen];
1465 Arrays.fill(table, ZIP_ENDCHAIN);
1466 int idx = 0;
1467 int hash = 0;
1468 int next = -1;
1469
1470 // list for all meta entries
1471 ArrayList<Integer> metanamesList = null;
1472
1473 // Iterate through the entries in the central directory
1474 int i = 0;
1475 int hsh = 0;
1476 int pos = 0;
1477 int limit = cen.length - ENDHDR;
1478 while (pos + CENHDR <= limit) {
1479 if (i >= total) {
1480 // This will only happen if the zip file has an incorrect
1481 // ENDTOT field, which usually means it contains more than
1482 // 65535 entries.
1483 initCEN(countCENHeaders(cen, limit));
1484 return;
1485 }
1486 if (CENSIG(cen, pos) != CENSIG)
1487 zerror("invalid CEN header (bad signature)");
1488 int method = CENHOW(cen, pos);
1489 int nlen = CENNAM(cen, pos);
1490 int elen = CENEXT(cen, pos);
1491 int clen = CENCOM(cen, pos);
1492 if ((CENFLG(cen, pos) & 1) != 0)
1493 zerror("invalid CEN header (encrypted entry)");
1494 if (method != STORED && method != DEFLATED)
1495 zerror("invalid CEN header (bad compression method: " + method + ")");
1496 if (pos + CENHDR + nlen > limit)
1497 zerror("invalid CEN header (bad header size)");
1498 // Record the CEN offset and the name hash in our hash cell.
1499 hash = hashN(cen, pos + CENHDR, nlen);
1500 hsh = (hash & 0x7fffffff) % tablelen;
1501 next = table[hsh];
1502 table[hsh] = idx;
1503 idx = addEntry(idx, hash, next, pos);
1504 // Adds name to metanames.
1505 if (isMetaName(cen, pos + CENHDR, nlen)) {
1506 if (metanamesList == null)
1507 metanamesList = new ArrayList<>(4);
1508 metanamesList.add(pos);
1509 }
1510 // skip ext and comment
1511 pos += (CENHDR + nlen + elen + clen);
1512 i++;
1513 }
1514 total = i;
1515 if (metanamesList != null) {
1516 metanames = new int[metanamesList.size()];
1517 for (int j = 0, len = metanames.length; j < len; j++) {
1518 metanames[j] = metanamesList.get(j);
1519 }
1520 }
1521 if (pos + ENDHDR != cen.length) {
1522 zerror("invalid CEN header (bad header size)");
1523 }
1524 }
1525
1526 private static void zerror(String msg) throws ZipException {
1527 throw new ZipException(msg);
1528 }
1529
1530 /*
1531 * Returns the {@code pos} of the zip cen entry corresponding to the
1532 * specified entry name, or -1 if not found.
1533 */
1534 private int getEntryPos(byte[] name, boolean addSlash) {
1535 if (total == 0) {
1536 return -1;
1537 }
1538 int hsh = hashN(name, 0, name.length);
1539 int idx = table[(hsh & 0x7fffffff) % tablelen];
1540 /*
1541 * This while loop is an optimization where a double lookup
1542 * for name and name+/ is being performed. The name char
1543 * array has enough room at the end to try again with a
1544 * slash appended if the first table lookup does not succeed.
1545 */
1546 while(true) {
1547 /*
1548 * Search down the target hash chain for a entry whose
1549 * 32 bit hash matches the hashed name.
1550 */
1551 while (idx != ZIP_ENDCHAIN) {
1552 if (getEntryHash(idx) == hsh) {
1553 // The CEN name must match the specfied one
1554 int pos = getEntryPos(idx);
1555 if (name.length == CENNAM(cen, pos)) {
1556 boolean matched = true;
1557 int nameoff = pos + CENHDR;
1558 for (int i = 0; i < name.length; i++) {
1559 if (name[i] != cen[nameoff++]) {
1560 matched = false;
1561 break;
1562 }
1563 }
1564 if (matched) {
1565 return pos;
1566 }
1567 }
1568 }
1569 idx = getEntryNext(idx);
1570 }
1571 /* If not addSlash, or slash is already there, we are done */
1572 if (!addSlash || name.length == 0 || name[name.length - 1] == '/') {
1573 return -1;
1574 }
1575 /* Add slash and try once more */
1576 name = Arrays.copyOf(name, name.length + 1);
1577 name[name.length - 1] = '/';
1578 hsh = hash_append(hsh, (byte)'/');
1579 //idx = table[hsh % tablelen];
1580 idx = table[(hsh & 0x7fffffff) % tablelen];
1581 addSlash = false;
1582 }
1583 }
1584
1585 /**
1586 * Returns true if the bytes represent a non-directory name
1587 * beginning with "META-INF/", disregarding ASCII case.
1588 */
1589 private static boolean isMetaName(byte[] name, int off, int len) {
1590 // Use the "oldest ASCII trick in the book"
1591 return len > 9 // "META-INF/".length()
1592 && name[off + len - 1] != '/' // non-directory
1593 && (name[off++] | 0x20) == 'm'
1594 && (name[off++] | 0x20) == 'e'
1595 && (name[off++] | 0x20) == 't'
1596 && (name[off++] | 0x20) == 'a'
1597 && (name[off++] ) == '-'
1598 && (name[off++] | 0x20) == 'i'
1599 && (name[off++] | 0x20) == 'n'
1600 && (name[off++] | 0x20) == 'f'
1601 && (name[off] ) == '/';
1602 }
1603
1604 /**
1605 * Returns the number of CEN headers in a central directory.
1606 * Will not throw, even if the zip file is corrupt.
1607 *
1608 * @param cen copy of the bytes in a zip file's central directory
1609 * @param size number of bytes in central directory
1610 */
1611 private static int countCENHeaders(byte[] cen, int size) {
1612 int count = 0;
1613 for (int p = 0;
1614 p + CENHDR <= size;
1615 p += CENHDR + CENNAM(cen, p) + CENEXT(cen, p) + CENCOM(cen, p))
1616 count++;
1617 return count;
1618 }
1619 }
1620 }