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 import jdk.internal.vm.annotation.Stable;
68
69 import static java.util.zip.ZipConstants64.*;
70 import static java.util.zip.ZipUtils.*;
71
72 /**
73 * This class is used to read entries from a zip file.
74 *
75 * <p> Unless otherwise noted, passing a {@code null} argument to a constructor
76 * or method in this class will cause a {@link NullPointerException} to be
77 * thrown.
78 *
79 * @apiNote
80 * To release resources used by this {@code ZipFile}, the {@link #close()} method
81 * should be called explicitly or by try-with-resources. Subclasses are responsible
82 * for the cleanup of resources acquired by the subclass. Subclasses that override
83 * {@link #finalize()} in order to perform cleanup should be modified to use alternative
84 * cleanup mechanisms such as {@link java.lang.ref.Cleaner} and remove the overriding
85 * {@code finalize} method.
86 *
87 * @implSpec
88 * If this {@code ZipFile} has been subclassed and the {@code close} method has
89 * been overridden, the {@code close} method will be called by the finalization
90 * when {@code ZipFile} is unreachable. But the subclasses should not depend on
91 * this specific implementation; the finalization is not reliable and the
92 * {@code finalize} method is deprecated to be removed.
93 *
94 * @author David Connelly
95 * @since 1.1
96 */
97 public
98 class ZipFile implements ZipConstants, Closeable {
99
100 private final String name; // zip file name
101 private volatile boolean closeRequested;
102 private final @Stable ZipCoder zc;
103
104 // The "resource" used by this zip file that needs to be
105 // cleaned after use.
106 // a) the input streams that need to be closed
107 // b) the list of cached Inflater objects
108 // c) the "native" source of this zip file.
109 private final @Stable CleanableResource res;
110
111 private static final int STORED = ZipEntry.STORED;
112 private static final int DEFLATED = ZipEntry.DEFLATED;
113
114 /**
115 * Mode flag to open a zip file for reading.
116 */
117 public static final int OPEN_READ = 0x1;
118
119 /**
120 * Mode flag to open a zip file and mark it for deletion. The file will be
121 * deleted some time between the moment that it is opened and the moment
122 * that it is closed, but its contents will remain accessible via the
123 * {@code ZipFile} object until either the close method is invoked or the
124 * virtual machine exits.
125 */
126 public static final int OPEN_DELETE = 0x4;
127
128 /**
129 * Opens a zip file for reading.
130 *
131 * <p>First, if there is a security manager, its {@code checkRead}
132 * method is called with the {@code name} argument as its argument
133 * to ensure the read is allowed.
134 *
135 * <p>The UTF-8 {@link java.nio.charset.Charset charset} is used to
136 * decode the entry names and comments.
137 *
138 * @param name the name of the zip file
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 its
142 * {@code checkRead} method doesn't allow read access to the file.
143 *
144 * @see SecurityManager#checkRead(java.lang.String)
145 */
146 public ZipFile(String name) throws IOException {
147 this(new File(name), OPEN_READ);
148 }
149
150 /**
151 * Opens a new {@code ZipFile} to read from the specified
152 * {@code File} object in the specified mode. The mode argument
153 * must be either {@code OPEN_READ} or {@code OPEN_READ | OPEN_DELETE}.
154 *
155 * <p>First, if there is a security manager, its {@code checkRead}
156 * method is called with the {@code name} argument as its argument to
157 * ensure the read is allowed.
158 *
159 * <p>The UTF-8 {@link java.nio.charset.Charset charset} is used to
160 * decode the entry names and comments
161 *
162 * @param file the ZIP file to be opened for reading
163 * @param mode the mode in which the file is to be opened
164 * @throws ZipException if a ZIP format error has occurred
165 * @throws IOException if an I/O error has occurred
166 * @throws SecurityException if a security manager exists and
167 * its {@code checkRead} method
168 * doesn't allow read access to the file,
169 * or its {@code checkDelete} method doesn't allow deleting
170 * the file when the {@code OPEN_DELETE} flag is set.
171 * @throws IllegalArgumentException if the {@code mode} argument is invalid
172 * @see SecurityManager#checkRead(java.lang.String)
173 * @since 1.3
174 */
175 public ZipFile(File file, int mode) throws IOException {
176 this(file, mode, StandardCharsets.UTF_8);
177 }
178
179 /**
180 * Opens a ZIP file for reading given the specified File object.
181 *
182 * <p>The UTF-8 {@link java.nio.charset.Charset charset} is used to
183 * decode the entry names and comments.
184 *
185 * @param file the ZIP file to be opened for reading
186 * @throws ZipException if a ZIP format error has occurred
187 * @throws IOException if an I/O error has occurred
188 */
189 public ZipFile(File file) throws ZipException, IOException {
190 this(file, OPEN_READ);
191 }
192
193 /**
194 * Opens a new {@code ZipFile} to read from the specified
195 * {@code File} object in the specified mode. The mode argument
196 * must be either {@code OPEN_READ} or {@code OPEN_READ | OPEN_DELETE}.
197 *
198 * <p>First, if there is a security manager, its {@code checkRead}
199 * method is called with the {@code name} argument as its argument to
200 * ensure the read is allowed.
201 *
202 * @param file the ZIP file to be opened for reading
203 * @param mode the mode in which the file is to be opened
204 * @param charset
205 * the {@linkplain java.nio.charset.Charset charset} to
206 * be used to decode the ZIP entry name and comment that are not
207 * encoded by using UTF-8 encoding (indicated by entry's general
208 * purpose flag).
209 *
210 * @throws ZipException if a ZIP format error has occurred
211 * @throws IOException if an I/O error has occurred
212 *
213 * @throws SecurityException
214 * if a security manager exists and its {@code checkRead}
215 * method doesn't allow read access to the file,or its
216 * {@code checkDelete} method doesn't allow deleting the
217 * file when the {@code OPEN_DELETE} flag is set
218 *
219 * @throws IllegalArgumentException if the {@code mode} argument is invalid
220 *
221 * @see SecurityManager#checkRead(java.lang.String)
222 *
223 * @since 1.7
224 */
225 public ZipFile(File file, int mode, Charset charset) throws IOException
226 {
227 if (((mode & OPEN_READ) == 0) ||
228 ((mode & ~(OPEN_READ | OPEN_DELETE)) != 0)) {
229 throw new IllegalArgumentException("Illegal mode: 0x"+
230 Integer.toHexString(mode));
231 }
232 String name = file.getPath();
233 SecurityManager sm = System.getSecurityManager();
234 if (sm != null) {
235 sm.checkRead(name);
236 if ((mode & OPEN_DELETE) != 0) {
237 sm.checkDelete(name);
238 }
239 }
240 Objects.requireNonNull(charset, "charset");
241
242 this.zc = ZipCoder.get(charset);
243 this.name = name;
244 long t0 = System.nanoTime();
245
246 this.res = CleanableResource.get(this, file, mode);
247
248 PerfCounter.getZipFileOpenTime().addElapsedTimeFrom(t0);
249 PerfCounter.getZipFileCount().increment();
250 }
251
252 /**
253 * Opens a zip file for reading.
254 *
255 * <p>First, if there is a security manager, its {@code checkRead}
256 * method is called with the {@code name} argument as its argument
257 * to ensure the read is allowed.
258 *
259 * @param name the name of the zip file
260 * @param charset
261 * the {@linkplain java.nio.charset.Charset charset} to
262 * be used to decode the ZIP entry name and comment that are not
263 * encoded by using UTF-8 encoding (indicated by entry's general
264 * purpose flag).
265 *
266 * @throws ZipException if a ZIP format error has occurred
267 * @throws IOException if an I/O error has occurred
268 * @throws SecurityException
269 * if a security manager exists and its {@code checkRead}
270 * method doesn't allow read access to the file
271 *
272 * @see SecurityManager#checkRead(java.lang.String)
273 *
274 * @since 1.7
275 */
276 public ZipFile(String name, Charset charset) throws IOException
277 {
278 this(new File(name), OPEN_READ, charset);
279 }
280
281 /**
282 * Opens a ZIP file for reading given the specified File object.
283 *
284 * @param file the ZIP file to be opened for reading
285 * @param charset
286 * The {@linkplain java.nio.charset.Charset charset} to be
287 * used to decode the ZIP entry name and comment (ignored if
288 * the <a href="package-summary.html#lang_encoding"> language
289 * encoding bit</a> of the ZIP entry's general purpose bit
290 * flag is set).
291 *
292 * @throws ZipException if a ZIP format error has occurred
293 * @throws IOException if an I/O error has occurred
294 *
295 * @since 1.7
296 */
297 public ZipFile(File file, Charset charset) throws IOException
298 {
299 this(file, OPEN_READ, charset);
300 }
301
302 /**
303 * Returns the zip file comment, or null if none.
304 *
305 * @return the comment string for the zip file, or null if none
306 *
307 * @throws IllegalStateException if the zip file has been closed
308 *
309 * @since 1.7
310 */
311 public String getComment() {
312 synchronized (this) {
313 ensureOpen();
314 if (res.zsrc.comment == null) {
315 return null;
316 }
317 return zc.toString(res.zsrc.comment);
318 }
319 }
320
321 /**
322 * Returns the zip file entry for the specified name, or null
323 * if not found.
324 *
325 * @param name the name of the entry
326 * @return the zip file entry, or null if not found
327 * @throws IllegalStateException if the zip file has been closed
328 */
329 public ZipEntry getEntry(String name) {
330 return getEntry(name, ZipEntry::new);
331 }
332
333 /*
334 * Returns the zip file entry for the specified name, or null
335 * if not found.
336 *
337 * @param name the name of the entry
338 * @param func the function that creates the returned entry
339 *
340 * @return the zip file entry, or null if not found
341 * @throws IllegalStateException if the zip file has been closed
342 */
343 private ZipEntry getEntry(String name, Function<String, ? extends ZipEntry> func) {
344 Objects.requireNonNull(name, "name");
345 synchronized (this) {
346 ensureOpen();
347 byte[] bname = zc.getBytes(name);
348 int pos = res.zsrc.getEntryPos(bname, true);
349 if (pos != -1) {
350 return getZipEntry(name, bname, pos, func);
351 }
352 }
353 return null;
354 }
355
356 /**
357 * Returns an input stream for reading the contents of the specified
358 * zip file entry.
359 * <p>
360 * Closing this ZIP file will, in turn, close all input streams that
361 * have been returned by invocations of this method.
362 *
363 * @param entry the zip file entry
364 * @return the input stream for reading the contents of the specified
365 * zip file entry.
366 * @throws ZipException if a ZIP format error has occurred
367 * @throws IOException if an I/O error has occurred
368 * @throws IllegalStateException if the zip file has been closed
369 */
370 public InputStream getInputStream(ZipEntry entry) throws IOException {
371 Objects.requireNonNull(entry, "entry");
372 int pos = -1;
373 ZipFileInputStream in;
374 Source zsrc = res.zsrc;
375 Set<InputStream> istreams = res.istreams;
376 synchronized (this) {
377 ensureOpen();
378 if (Objects.equals(lastEntryName, entry.name)) {
379 pos = lastEntryPos;
380 } else if (!zc.isUTF8() && (entry.flag & EFS) != 0) {
381 pos = zsrc.getEntryPos(zc.getBytesUTF8(entry.name), false);
382 } else {
383 pos = zsrc.getEntryPos(zc.getBytes(entry.name), false);
384 }
385 if (pos == -1) {
386 return null;
387 }
388 in = new ZipFileInputStream(zsrc.cen, pos);
389 switch (CENHOW(zsrc.cen, pos)) {
390 case STORED:
391 synchronized (istreams) {
392 istreams.add(in);
393 }
394 return in;
395 case DEFLATED:
396 // Inflater likes a bit of slack
397 // MORE: Compute good size for inflater stream:
398 long size = CENLEN(zsrc.cen, pos) + 2;
399 if (size > 65536) {
400 size = 8192;
401 }
402 if (size <= 0) {
403 size = 4096;
404 }
405 InputStream is = new ZipFileInflaterInputStream(in, res, (int)size);
406 synchronized (istreams) {
407 istreams.add(is);
408 }
409 return is;
410 default:
411 throw new ZipException("invalid compression method");
412 }
413 }
414 }
415
416 private static class InflaterCleanupAction implements Runnable {
417 private final Inflater inf;
418 private final CleanableResource res;
419
420 InflaterCleanupAction(Inflater inf, CleanableResource res) {
421 this.inf = inf;
422 this.res = res;
423 }
424
425 @Override
426 public void run() {
427 res.releaseInflater(inf);
428 }
429 }
430
431 private class ZipFileInflaterInputStream extends InflaterInputStream {
432 private volatile boolean closeRequested;
433 private boolean eof = false;
434 private final Cleanable cleanable;
435
436 ZipFileInflaterInputStream(ZipFileInputStream zfin,
437 CleanableResource res, int size) {
438 this(zfin, res, res.getInflater(), size);
439 }
440
441 private ZipFileInflaterInputStream(ZipFileInputStream zfin,
442 CleanableResource res,
443 Inflater inf, int size) {
444 super(zfin, inf, size);
445 this.cleanable = CleanerFactory.cleaner().register(this,
446 new InflaterCleanupAction(inf, res));
447 }
448
449 public void close() throws IOException {
450 if (closeRequested)
451 return;
452 closeRequested = true;
453 super.close();
454 synchronized (res.istreams) {
455 res.istreams.remove(this);
456 }
457 cleanable.clean();
458 }
459
460 // Override fill() method to provide an extra "dummy" byte
461 // at the end of the input stream. This is required when
462 // using the "nowrap" Inflater option.
463 protected void fill() throws IOException {
464 if (eof) {
465 throw new EOFException("Unexpected end of ZLIB input stream");
466 }
467 len = in.read(buf, 0, buf.length);
468 if (len == -1) {
469 buf[0] = 0;
470 len = 1;
471 eof = true;
472 }
473 inf.setInput(buf, 0, len);
474 }
475
476 public int available() throws IOException {
477 if (closeRequested)
478 return 0;
479 long avail = ((ZipFileInputStream)in).size() - inf.getBytesWritten();
480 return (avail > (long) Integer.MAX_VALUE ?
481 Integer.MAX_VALUE : (int) avail);
482 }
483 }
484
485 /**
486 * Returns the path name of the ZIP file.
487 * @return the path name of the ZIP file
488 */
489 public String getName() {
490 return name;
491 }
492
493 private class ZipEntryIterator<T extends ZipEntry>
494 implements Enumeration<T>, Iterator<T> {
495
496 private int i = 0;
497 private final int entryCount;
498 private final Function<String, T> gen;
499
500 public ZipEntryIterator(int entryCount, Function<String, T> gen) {
501 this.entryCount = entryCount;
502 this.gen = gen;
503 }
504
505 @Override
506 public boolean hasMoreElements() {
507 return hasNext();
508 }
509
510 @Override
511 public boolean hasNext() {
512 return i < entryCount;
513 }
514
515 @Override
516 public T nextElement() {
517 return next();
518 }
519
520 @Override
521 @SuppressWarnings("unchecked")
522 public T next() {
523 synchronized (ZipFile.this) {
524 ensureOpen();
525 if (!hasNext()) {
526 throw new NoSuchElementException();
527 }
528 // each "entry" has 3 ints in table entries
529 return (T)getZipEntry(null, null, res.zsrc.getEntryPos(i++ * 3), gen);
530 }
531 }
532
533 @Override
534 public Iterator<T> asIterator() {
535 return this;
536 }
537 }
538
539 /**
540 * Returns an enumeration of the ZIP file entries.
541 * @return an enumeration of the ZIP file entries
542 * @throws IllegalStateException if the zip file has been closed
543 */
544 public Enumeration<? extends ZipEntry> entries() {
545 synchronized (this) {
546 ensureOpen();
547 return new ZipEntryIterator<ZipEntry>(res.zsrc.total, ZipEntry::new);
548 }
549 }
550
551 private Enumeration<JarEntry> entries(Function<String, JarEntry> func) {
552 synchronized (this) {
553 ensureOpen();
554 return new ZipEntryIterator<JarEntry>(res.zsrc.total, func);
555 }
556 }
557
558 private class EntrySpliterator<T> extends Spliterators.AbstractSpliterator<T> {
559 private int index;
560 private final int fence;
561 private final IntFunction<T> gen;
562
563 EntrySpliterator(int index, int fence, IntFunction<T> gen) {
564 super((long)fence,
565 Spliterator.ORDERED | Spliterator.DISTINCT | Spliterator.IMMUTABLE |
566 Spliterator.NONNULL);
567 this.index = index;
568 this.fence = fence;
569 this.gen = gen;
570 }
571
572 @Override
573 public boolean tryAdvance(Consumer<? super T> action) {
574 if (action == null)
575 throw new NullPointerException();
576 if (index >= 0 && index < fence) {
577 synchronized (ZipFile.this) {
578 ensureOpen();
579 action.accept(gen.apply(res.zsrc.getEntryPos(index++ * 3)));
580 }
581 return true;
582 }
583 return false;
584 }
585 }
586
587 /**
588 * Returns an ordered {@code Stream} over the ZIP file entries.
589 *
590 * Entries appear in the {@code Stream} in the order they appear in
591 * the central directory of the ZIP file.
592 *
593 * @return an ordered {@code Stream} of entries in this ZIP file
594 * @throws IllegalStateException if the zip file has been closed
595 * @since 1.8
596 */
597 public Stream<? extends ZipEntry> stream() {
598 synchronized (this) {
599 ensureOpen();
600 return StreamSupport.stream(new EntrySpliterator<>(0, res.zsrc.total,
601 pos -> getZipEntry(null, null, pos, ZipEntry::new)), false);
602 }
603 }
604
605 private String getEntryName(int pos) {
606 byte[] cen = res.zsrc.cen;
607 int nlen = CENNAM(cen, pos);
608 if (!zc.isUTF8() && (CENFLG(cen, pos) & EFS) != 0) {
609 return zc.toStringUTF8(cen, pos + CENHDR, nlen);
610 } else {
611 return zc.toString(cen, pos + CENHDR, nlen);
612 }
613 }
614
615 /*
616 * Returns an ordered {@code Stream} over the zip file entry names.
617 *
618 * Entry names appear in the {@code Stream} in the order they appear in
619 * the central directory of the ZIP file.
620 *
621 * @return an ordered {@code Stream} of entry names in this zip file
622 * @throws IllegalStateException if the zip file has been closed
623 * @since 10
624 */
625 private Stream<String> entryNameStream() {
626 synchronized (this) {
627 ensureOpen();
628 return StreamSupport.stream(
629 new EntrySpliterator<>(0, res.zsrc.total, this::getEntryName), false);
630 }
631 }
632
633 /*
634 * Returns an ordered {@code Stream} over the zip file entries.
635 *
636 * Entries appear in the {@code Stream} in the order they appear in
637 * the central directory of the jar file.
638 *
639 * @param func the function that creates the returned entry
640 * @return an ordered {@code Stream} of entries in this zip file
641 * @throws IllegalStateException if the zip file has been closed
642 * @since 10
643 */
644 private Stream<JarEntry> stream(Function<String, JarEntry> func) {
645 synchronized (this) {
646 ensureOpen();
647 return StreamSupport.stream(new EntrySpliterator<>(0, res.zsrc.total,
648 pos -> (JarEntry)getZipEntry(null, null, pos, func)), false);
649 }
650 }
651
652 private String lastEntryName;
653 private int lastEntryPos;
654
655 /* Checks ensureOpen() before invoke this method */
656 private ZipEntry getZipEntry(String name, byte[] bname, int pos,
657 Function<String, ? extends ZipEntry> func) {
658 byte[] cen = res.zsrc.cen;
659 int nlen = CENNAM(cen, pos);
660 int elen = CENEXT(cen, pos);
661 int clen = CENCOM(cen, pos);
662 int flag = CENFLG(cen, pos);
663 if (name == null || bname.length != nlen) {
664 // to use the entry name stored in cen, if the passed in name is
665 // (1) null, invoked from iterator, or
666 // (2) not equal to the name stored, a slash is appended during
667 // getEntryPos() search.
668 if (!zc.isUTF8() && (flag & EFS) != 0) {
669 name = zc.toStringUTF8(cen, pos + CENHDR, nlen);
670 } else {
671 name = zc.toString(cen, pos + CENHDR, nlen);
672 }
673 }
674 ZipEntry e = func.apply(name); //ZipEntry e = new ZipEntry(name);
675 e.flag = flag;
676 e.xdostime = CENTIM(cen, pos);
677 e.crc = CENCRC(cen, pos);
678 e.size = CENLEN(cen, pos);
679 e.csize = CENSIZ(cen, pos);
680 e.method = CENHOW(cen, pos);
681 if (elen != 0) {
682 int start = pos + CENHDR + nlen;
683 e.setExtra0(Arrays.copyOfRange(cen, start, start + elen), true);
684 }
685 if (clen != 0) {
686 int start = pos + CENHDR + nlen + elen;
687 if (!zc.isUTF8() && (flag & EFS) != 0) {
688 e.comment = zc.toStringUTF8(cen, start, clen);
689 } else {
690 e.comment = zc.toString(cen, start, clen);
691 }
692 }
693 lastEntryName = e.name;
694 lastEntryPos = pos;
695 return e;
696 }
697
698 /**
699 * Returns the number of entries in the ZIP file.
700 *
701 * @return the number of entries in the ZIP file
702 * @throws IllegalStateException if the zip file has been closed
703 */
704 public int size() {
705 synchronized (this) {
706 ensureOpen();
707 return res.zsrc.total;
708 }
709 }
710
711 private static class CleanableResource implements Runnable {
712 // The outstanding inputstreams that need to be closed
713 final Set<InputStream> istreams;
714
715 // List of cached Inflater objects for decompression
716 Deque<Inflater> inflaterCache;
717
718 final Cleanable cleanable;
719
720 Source zsrc;
721
722 CleanableResource(ZipFile zf, File file, int mode) throws IOException {
723 this.cleanable = CleanerFactory.cleaner().register(zf, this);
724 this.istreams = Collections.newSetFromMap(new WeakHashMap<>());
725 this.inflaterCache = new ArrayDeque<>();
726 this.zsrc = Source.get(file, (mode & OPEN_DELETE) != 0);
727 }
728
729 void clean() {
730 cleanable.clean();
731 }
732
733 /*
734 * Gets an inflater from the list of available inflaters or allocates
735 * a new one.
736 */
737 Inflater getInflater() {
738 Inflater inf;
739 synchronized (inflaterCache) {
740 if ((inf = inflaterCache.poll()) != null) {
741 return inf;
742 }
743 }
744 return new Inflater(true);
745 }
746
747 /*
748 * Releases the specified inflater to the list of available inflaters.
749 */
750 void releaseInflater(Inflater inf) {
751 Deque<Inflater> inflaters = this.inflaterCache;
752 if (inflaters != null) {
753 synchronized (inflaters) {
754 // double checked!
755 if (inflaters == this.inflaterCache) {
756 inf.reset();
757 inflaters.add(inf);
758 return;
759 }
760 }
761 }
762 // inflaters cache already closed - just end it.
763 inf.end();
764 }
765
766 public void run() {
767 IOException ioe = null;
768
769 // Release cached inflaters and close the cache first
770 Deque<Inflater> inflaters = this.inflaterCache;
771 if (inflaters != null) {
772 synchronized (inflaters) {
773 // no need to double-check as only one thread gets a
774 // chance to execute run() (Cleaner guarantee)...
775 Inflater inf;
776 while ((inf = inflaters.poll()) != null) {
777 inf.end();
778 }
779 // close inflaters cache
780 this.inflaterCache = null;
781 }
782 }
783
784 // Close streams, release their inflaters
785 if (istreams != null) {
786 synchronized (istreams) {
787 if (!istreams.isEmpty()) {
788 InputStream[] copy = istreams.toArray(new InputStream[0]);
789 istreams.clear();
790 for (InputStream is : copy) {
791 try {
792 is.close();
793 } catch (IOException e) {
794 if (ioe == null) ioe = e;
795 else ioe.addSuppressed(e);
796 }
797 }
798 }
799 }
800 }
801
802 // Release zip src
803 if (zsrc != null) {
804 synchronized (zsrc) {
805 try {
806 Source.release(zsrc);
807 zsrc = null;
808 } catch (IOException e) {
809 if (ioe == null) ioe = e;
810 else ioe.addSuppressed(e);
811 }
812 }
813 }
814 if (ioe != null) {
815 throw new UncheckedIOException(ioe);
816 }
817 }
818
819 CleanableResource(File file, int mode)
820 throws IOException {
821 this.cleanable = null;
822 this.istreams = Collections.newSetFromMap(new WeakHashMap<>());
823 this.inflaterCache = new ArrayDeque<>();
824 this.zsrc = Source.get(file, (mode & OPEN_DELETE) != 0);
825 }
826
827 /*
828 * If {@code ZipFile} has been subclassed and the {@code close} method is
829 * overridden, uses the {@code finalizer} mechanism for resource cleanup.
830 * So {@code close} method can be called when the the {@code ZipFile} is
831 * unreachable. This mechanism will be removed when {@code finalize} method
832 * is removed from {@code ZipFile}.
833 */
834 static CleanableResource get(ZipFile zf, File file, int mode)
835 throws IOException {
836 Class<?> clz = zf.getClass();
837 while (clz != ZipFile.class) {
838 try {
839 clz.getDeclaredMethod("close");
840 return new FinalizableResource(zf, file, mode);
841 } catch (NoSuchMethodException nsme) {}
842 clz = clz.getSuperclass();
843 }
844 return new CleanableResource(zf, file, mode);
845 }
846
847 static class FinalizableResource extends CleanableResource {
848 ZipFile zf;
849 FinalizableResource(ZipFile zf, File file, int mode)
850 throws IOException {
851 super(file, mode);
852 this.zf = zf;
853 }
854
855 @Override
856 void clean() {
857 run();
858 }
859
860 @Override
861 @SuppressWarnings("deprecation")
862 protected void finalize() throws IOException {
863 zf.close();
864 }
865 }
866 }
867
868 /**
869 * Closes the ZIP file.
870 *
871 * <p> Closing this ZIP file will close all of the input streams
872 * previously returned by invocations of the {@link #getInputStream
873 * getInputStream} method.
874 *
875 * @throws IOException if an I/O error has occurred
876 */
877 public void close() throws IOException {
878 if (closeRequested) {
879 return;
880 }
881 closeRequested = true;
882
883 synchronized (this) {
884 // Close streams, release their inflaters, release cached inflaters
885 // and release zip source
886 try {
887 res.clean();
888 } catch (UncheckedIOException ioe) {
889 throw ioe.getCause();
890 }
891 }
892 }
893
894 /**
895 * Ensures that the system resources held by this ZipFile object are
896 * released when there are no more references to it.
897 *
898 * @deprecated The {@code finalize} method has been deprecated and will be
899 * removed. It is implemented as a no-op. Subclasses that override
900 * {@code finalize} in order to perform cleanup should be modified to
901 * use alternative cleanup mechanisms and to remove the overriding
902 * {@code finalize} method. The recommended cleanup for ZipFile object
903 * is to explicitly invoke {@code close} method when it is no longer in
904 * use, or use try-with-resources. If the {@code close} is not invoked
905 * explicitly the resources held by this object will be released when
906 * the instance becomes unreachable.
907 *
908 * @throws IOException if an I/O error has occurred
909 */
910 @Deprecated(since="9", forRemoval=true)
911 protected void finalize() throws IOException {}
912
913 private void ensureOpen() {
914 if (closeRequested) {
915 throw new IllegalStateException("zip file closed");
916 }
917 if (res.zsrc == null) {
918 throw new IllegalStateException("The object is not initialized.");
919 }
920 }
921
922 private void ensureOpenOrZipException() throws IOException {
923 if (closeRequested) {
924 throw new ZipException("ZipFile closed");
925 }
926 }
927
928 /*
929 * Inner class implementing the input stream used to read a
930 * (possibly compressed) zip file entry.
931 */
932 private class ZipFileInputStream extends InputStream {
933 private volatile boolean closeRequested;
934 private long pos; // current position within entry data
935 protected long rem; // number of remaining bytes within entry
936 protected long size; // uncompressed size of this entry
937
938 ZipFileInputStream(byte[] cen, int cenpos) {
939 rem = CENSIZ(cen, cenpos);
940 size = CENLEN(cen, cenpos);
941 pos = CENOFF(cen, cenpos);
942 // zip64
943 if (rem == ZIP64_MAGICVAL || size == ZIP64_MAGICVAL ||
944 pos == ZIP64_MAGICVAL) {
945 checkZIP64(cen, cenpos);
946 }
947 // negative for lazy initialization, see getDataOffset();
948 pos = - (pos + ZipFile.this.res.zsrc.locpos);
949 }
950
951 private void checkZIP64(byte[] cen, int cenpos) {
952 int off = cenpos + CENHDR + CENNAM(cen, cenpos);
953 int end = off + CENEXT(cen, cenpos);
954 while (off + 4 < end) {
955 int tag = get16(cen, off);
956 int sz = get16(cen, off + 2);
957 off += 4;
958 if (off + sz > end) // invalid data
959 break;
960 if (tag == EXTID_ZIP64) {
961 if (size == ZIP64_MAGICVAL) {
962 if (sz < 8 || (off + 8) > end)
963 break;
964 size = get64(cen, off);
965 sz -= 8;
966 off += 8;
967 }
968 if (rem == ZIP64_MAGICVAL) {
969 if (sz < 8 || (off + 8) > end)
970 break;
971 rem = get64(cen, off);
972 sz -= 8;
973 off += 8;
974 }
975 if (pos == ZIP64_MAGICVAL) {
976 if (sz < 8 || (off + 8) > end)
977 break;
978 pos = get64(cen, off);
979 sz -= 8;
980 off += 8;
981 }
982 break;
983 }
984 off += sz;
985 }
986 }
987
988 /* The Zip file spec explicitly allows the LOC extra data size to
989 * be different from the CEN extra data size. Since we cannot trust
990 * the CEN extra data size, we need to read the LOC to determine
991 * the entry data offset.
992 */
993 private long initDataOffset() throws IOException {
994 if (pos <= 0) {
995 byte[] loc = new byte[LOCHDR];
996 pos = -pos;
997 int len = ZipFile.this.res.zsrc.readFullyAt(loc, 0, loc.length, pos);
998 if (len != LOCHDR) {
999 throw new ZipException("ZipFile error reading zip file");
1000 }
1001 if (LOCSIG(loc) != LOCSIG) {
1002 throw new ZipException("ZipFile invalid LOC header (bad signature)");
1003 }
1004 pos += LOCHDR + LOCNAM(loc) + LOCEXT(loc);
1005 }
1006 return pos;
1007 }
1008
1009 public int read(byte b[], int off, int len) throws IOException {
1010 synchronized (ZipFile.this) {
1011 ensureOpenOrZipException();
1012 initDataOffset();
1013 if (rem == 0) {
1014 return -1;
1015 }
1016 if (len > rem) {
1017 len = (int) rem;
1018 }
1019 if (len <= 0) {
1020 return 0;
1021 }
1022 len = ZipFile.this.res.zsrc.readAt(b, off, len, pos);
1023 if (len > 0) {
1024 pos += len;
1025 rem -= len;
1026 }
1027 }
1028 if (rem == 0) {
1029 close();
1030 }
1031 return len;
1032 }
1033
1034 public int read() throws IOException {
1035 byte[] b = new byte[1];
1036 if (read(b, 0, 1) == 1) {
1037 return b[0] & 0xff;
1038 } else {
1039 return -1;
1040 }
1041 }
1042
1043 public long skip(long n) throws IOException {
1044 synchronized (ZipFile.this) {
1045 initDataOffset();
1046 if (n > rem) {
1047 n = rem;
1048 }
1049 pos += n;
1050 rem -= n;
1051 }
1052 if (rem == 0) {
1053 close();
1054 }
1055 return n;
1056 }
1057
1058 public int available() {
1059 return rem > Integer.MAX_VALUE ? Integer.MAX_VALUE : (int) rem;
1060 }
1061
1062 public long size() {
1063 return size;
1064 }
1065
1066 public void close() {
1067 if (closeRequested) {
1068 return;
1069 }
1070 closeRequested = true;
1071 rem = 0;
1072 synchronized (res.istreams) {
1073 res.istreams.remove(this);
1074 }
1075 }
1076
1077 }
1078
1079 /**
1080 * Returns the names of all non-directory entries that begin with
1081 * "META-INF/" (case ignored). This method is used in JarFile, via
1082 * SharedSecrets, as an optimization when looking up manifest and
1083 * signature file entries. Returns null if no entries were found.
1084 */
1085 private String[] getMetaInfEntryNames() {
1086 synchronized (this) {
1087 ensureOpen();
1088 Source zsrc = res.zsrc;
1089 if (zsrc.metanames == null) {
1090 return null;
1091 }
1092 String[] names = new String[zsrc.metanames.length];
1093 byte[] cen = zsrc.cen;
1094 for (int i = 0; i < names.length; i++) {
1095 int pos = zsrc.metanames[i];
1096 names[i] = new String(cen, pos + CENHDR, CENNAM(cen, pos),
1097 StandardCharsets.UTF_8);
1098 }
1099 return names;
1100 }
1101 }
1102
1103 private static boolean isWindows;
1104 static {
1105 SharedSecrets.setJavaUtilZipFileAccess(
1106 new JavaUtilZipFileAccess() {
1107 @Override
1108 public boolean startsWithLocHeader(ZipFile zip) {
1109 return zip.res.zsrc.startsWithLoc;
1110 }
1111 @Override
1112 public String[] getMetaInfEntryNames(ZipFile zip) {
1113 return zip.getMetaInfEntryNames();
1114 }
1115 @Override
1116 public JarEntry getEntry(ZipFile zip, String name,
1117 Function<String, JarEntry> func) {
1118 return (JarEntry)zip.getEntry(name, func);
1119 }
1120 @Override
1121 public Enumeration<JarEntry> entries(ZipFile zip,
1122 Function<String, JarEntry> func) {
1123 return zip.entries(func);
1124 }
1125 @Override
1126 public Stream<JarEntry> stream(ZipFile zip,
1127 Function<String, JarEntry> func) {
1128 return zip.stream(func);
1129 }
1130 @Override
1131 public Stream<String> entryNameStream(ZipFile zip) {
1132 return zip.entryNameStream();
1133 }
1134 }
1135 );
1136 isWindows = VM.getSavedProperty("os.name").contains("Windows");
1137 }
1138
1139 private static class Source {
1140 private final Key key; // the key in files
1141 private int refs = 1;
1142
1143 private RandomAccessFile zfile; // zfile of the underlying zip file
1144 private byte[] cen; // CEN & ENDHDR
1145 private long locpos; // position of first LOC header (usually 0)
1146 private byte[] comment; // zip file comment
1147 // list of meta entries in META-INF dir
1148 private int[] metanames;
1149 private final boolean startsWithLoc; // true, if zip file starts with LOCSIG (usually true)
1150
1151 // A Hashmap for all entries.
1152 //
1153 // A cen entry of Zip/JAR file. As we have one for every entry in every active Zip/JAR,
1154 // We might have a lot of these in a typical system. In order to save space we don't
1155 // keep the name in memory, but merely remember a 32 bit {@code hash} value of the
1156 // entry name and its offset {@code pos} in the central directory hdeader.
1157 //
1158 // private static class Entry {
1159 // int hash; // 32 bit hashcode on name
1160 // int next; // hash chain: index into entries
1161 // int pos; // Offset of central directory file header
1162 // }
1163 // private Entry[] entries; // array of hashed cen entry
1164 //
1165 // To reduce the total size of entries further, we use a int[] here to store 3 "int"
1166 // {@code hash}, {@code next and {@code "pos for each entry. The entry can then be
1167 // referred by their index of their positions in the {@code entries}.
1168 //
1169 private int[] entries; // array of hashed cen entry
1170 private int addEntry(int index, int hash, int next, int pos) {
1171 entries[index++] = hash;
1172 entries[index++] = next;
1173 entries[index++] = pos;
1174 return index;
1175 }
1176 private int getEntryHash(int index) { return entries[index]; }
1177 private int getEntryNext(int index) { return entries[index + 1]; }
1178 private int getEntryPos(int index) { return entries[index + 2]; }
1179 private static final int ZIP_ENDCHAIN = -1;
1180 private int total; // total number of entries
1181 private int[] table; // Hash chain heads: indexes into entries
1182 private int tablelen; // number of hash heads
1183
1184 private static class Key {
1185 BasicFileAttributes attrs;
1186 File file;
1187
1188 public Key(File file, BasicFileAttributes attrs) {
1189 this.attrs = attrs;
1190 this.file = file;
1191 }
1192
1193 public int hashCode() {
1194 long t = attrs.lastModifiedTime().toMillis();
1195 return ((int)(t ^ (t >>> 32))) + file.hashCode();
1196 }
1197
1198 public boolean equals(Object obj) {
1199 if (obj instanceof Key) {
1200 Key key = (Key)obj;
1201 if (!attrs.lastModifiedTime().equals(key.attrs.lastModifiedTime())) {
1202 return false;
1203 }
1204 Object fk = attrs.fileKey();
1205 if (fk != null) {
1206 return fk.equals(key.attrs.fileKey());
1207 } else {
1208 return file.equals(key.file);
1209 }
1210 }
1211 return false;
1212 }
1213 }
1214 private static final HashMap<Key, Source> files = new HashMap<>();
1215
1216
1217 static Source get(File file, boolean toDelete) throws IOException {
1218 Key key = new Key(file,
1219 Files.readAttributes(file.toPath(), BasicFileAttributes.class));
1220 Source src;
1221 synchronized (files) {
1222 src = files.get(key);
1223 if (src != null) {
1224 src.refs++;
1225 return src;
1226 }
1227 }
1228 src = new Source(key, toDelete);
1229
1230 synchronized (files) {
1231 if (files.containsKey(key)) { // someone else put in first
1232 src.close(); // close the newly created one
1233 src = files.get(key);
1234 src.refs++;
1235 return src;
1236 }
1237 files.put(key, src);
1238 return src;
1239 }
1240 }
1241
1242 static void release(Source src) throws IOException {
1243 synchronized (files) {
1244 if (src != null && --src.refs == 0) {
1245 files.remove(src.key);
1246 src.close();
1247 }
1248 }
1249 }
1250
1251 private Source(Key key, boolean toDelete) throws IOException {
1252 this.key = key;
1253 if (toDelete) {
1254 if (isWindows) {
1255 this.zfile = SharedSecrets.getJavaIORandomAccessFileAccess()
1256 .openAndDelete(key.file, "r");
1257 } else {
1258 this.zfile = new RandomAccessFile(key.file, "r");
1259 key.file.delete();
1260 }
1261 } else {
1262 this.zfile = new RandomAccessFile(key.file, "r");
1263 }
1264 try {
1265 initCEN(-1);
1266 byte[] buf = new byte[4];
1267 readFullyAt(buf, 0, 4, 0);
1268 this.startsWithLoc = (LOCSIG(buf) == LOCSIG);
1269 } catch (IOException x) {
1270 try {
1271 this.zfile.close();
1272 } catch (IOException xx) {}
1273 throw x;
1274 }
1275 }
1276
1277 private void close() throws IOException {
1278 zfile.close();
1279 zfile = null;
1280 cen = null;
1281 entries = null;
1282 table = null;
1283 metanames = null;
1284 }
1285
1286 private static final int BUF_SIZE = 8192;
1287 private final int readFullyAt(byte[] buf, int off, int len, long pos)
1288 throws IOException
1289 {
1290 synchronized(zfile) {
1291 zfile.seek(pos);
1292 int N = len;
1293 while (N > 0) {
1294 int n = Math.min(BUF_SIZE, N);
1295 zfile.readFully(buf, off, n);
1296 off += n;
1297 N -= n;
1298 }
1299 return len;
1300 }
1301 }
1302
1303 private final int readAt(byte[] buf, int off, int len, long pos)
1304 throws IOException
1305 {
1306 synchronized(zfile) {
1307 zfile.seek(pos);
1308 return zfile.read(buf, off, len);
1309 }
1310 }
1311
1312 private static final int hashN(byte[] a, int off, int len) {
1313 int h = 1;
1314 while (len-- > 0) {
1315 h = 31 * h + a[off++];
1316 }
1317 return h;
1318 }
1319
1320 private static final int hash_append(int hash, byte b) {
1321 return hash * 31 + b;
1322 }
1323
1324 private static class End {
1325 int centot; // 4 bytes
1326 long cenlen; // 4 bytes
1327 long cenoff; // 4 bytes
1328 long endpos; // 4 bytes
1329 }
1330
1331 /*
1332 * Searches for end of central directory (END) header. The contents of
1333 * the END header will be read and placed in endbuf. Returns the file
1334 * position of the END header, otherwise returns -1 if the END header
1335 * was not found or an error occurred.
1336 */
1337 private End findEND() throws IOException {
1338 long ziplen = zfile.length();
1339 if (ziplen <= 0)
1340 zerror("zip file is empty");
1341 End end = new End();
1342 byte[] buf = new byte[READBLOCKSZ];
1343 long minHDR = (ziplen - END_MAXLEN) > 0 ? ziplen - END_MAXLEN : 0;
1344 long minPos = minHDR - (buf.length - ENDHDR);
1345 for (long pos = ziplen - buf.length; pos >= minPos; pos -= (buf.length - ENDHDR)) {
1346 int off = 0;
1347 if (pos < 0) {
1348 // Pretend there are some NUL bytes before start of file
1349 off = (int)-pos;
1350 Arrays.fill(buf, 0, off, (byte)0);
1351 }
1352 int len = buf.length - off;
1353 if (readFullyAt(buf, off, len, pos + off) != len ) {
1354 zerror("zip END header not found");
1355 }
1356 // Now scan the block backwards for END header signature
1357 for (int i = buf.length - ENDHDR; i >= 0; i--) {
1358 if (buf[i+0] == (byte)'P' &&
1359 buf[i+1] == (byte)'K' &&
1360 buf[i+2] == (byte)'\005' &&
1361 buf[i+3] == (byte)'\006') {
1362 // Found ENDSIG header
1363 byte[] endbuf = Arrays.copyOfRange(buf, i, i + ENDHDR);
1364 end.centot = ENDTOT(endbuf);
1365 end.cenlen = ENDSIZ(endbuf);
1366 end.cenoff = ENDOFF(endbuf);
1367 end.endpos = pos + i;
1368 int comlen = ENDCOM(endbuf);
1369 if (end.endpos + ENDHDR + comlen != ziplen) {
1370 // ENDSIG matched, however the size of file comment in it does
1371 // not match the real size. One "common" cause for this problem
1372 // is some "extra" bytes are padded at the end of the zipfile.
1373 // Let's do some extra verification, we don't care about the
1374 // performance in this situation.
1375 byte[] sbuf = new byte[4];
1376 long cenpos = end.endpos - end.cenlen;
1377 long locpos = cenpos - end.cenoff;
1378 if (cenpos < 0 ||
1379 locpos < 0 ||
1380 readFullyAt(sbuf, 0, sbuf.length, cenpos) != 4 ||
1381 GETSIG(sbuf) != CENSIG ||
1382 readFullyAt(sbuf, 0, sbuf.length, locpos) != 4 ||
1383 GETSIG(sbuf) != LOCSIG) {
1384 continue;
1385 }
1386 }
1387 if (comlen > 0) { // this zip file has comlen
1388 comment = new byte[comlen];
1389 if (readFullyAt(comment, 0, comlen, end.endpos + ENDHDR) != comlen) {
1390 zerror("zip comment read failed");
1391 }
1392 }
1393 // must check for a zip64 end record; it is always permitted to be present
1394 try {
1395 byte[] loc64 = new byte[ZIP64_LOCHDR];
1396 if (end.endpos < ZIP64_LOCHDR ||
1397 readFullyAt(loc64, 0, loc64.length, end.endpos - ZIP64_LOCHDR)
1398 != loc64.length || GETSIG(loc64) != ZIP64_LOCSIG) {
1399 return end;
1400 }
1401 long end64pos = ZIP64_LOCOFF(loc64);
1402 byte[] end64buf = new byte[ZIP64_ENDHDR];
1403 if (readFullyAt(end64buf, 0, end64buf.length, end64pos)
1404 != end64buf.length || GETSIG(end64buf) != ZIP64_ENDSIG) {
1405 return end;
1406 }
1407 // end64 candidate found,
1408 long cenlen64 = ZIP64_ENDSIZ(end64buf);
1409 long cenoff64 = ZIP64_ENDOFF(end64buf);
1410 long centot64 = ZIP64_ENDTOT(end64buf);
1411 // double-check
1412 if (cenlen64 != end.cenlen && end.cenlen != ZIP64_MAGICVAL ||
1413 cenoff64 != end.cenoff && end.cenoff != ZIP64_MAGICVAL ||
1414 centot64 != end.centot && end.centot != ZIP64_MAGICCOUNT) {
1415 return end;
1416 }
1417 // to use the end64 values
1418 end.cenlen = cenlen64;
1419 end.cenoff = cenoff64;
1420 end.centot = (int)centot64; // assume total < 2g
1421 end.endpos = end64pos;
1422 } catch (IOException x) {} // no zip64 loc/end
1423 return end;
1424 }
1425 }
1426 }
1427 zerror("zip END header not found");
1428 return null; //make compiler happy
1429 }
1430
1431 // Reads zip file central directory.
1432 private void initCEN(int knownTotal) throws IOException {
1433 if (knownTotal == -1) {
1434 End end = findEND();
1435 if (end.endpos == 0) {
1436 locpos = 0;
1437 total = 0;
1438 entries = new int[0];
1439 cen = null;
1440 return; // only END header present
1441 }
1442 if (end.cenlen > end.endpos)
1443 zerror("invalid END header (bad central directory size)");
1444 long cenpos = end.endpos - end.cenlen; // position of CEN table
1445 // Get position of first local file (LOC) header, taking into
1446 // account that there may be a stub prefixed to the zip file.
1447 locpos = cenpos - end.cenoff;
1448 if (locpos < 0) {
1449 zerror("invalid END header (bad central directory offset)");
1450 }
1451 // read in the CEN and END
1452 cen = new byte[(int)(end.cenlen + ENDHDR)];
1453 if (readFullyAt(cen, 0, cen.length, cenpos) != end.cenlen + ENDHDR) {
1454 zerror("read CEN tables failed");
1455 }
1456 total = end.centot;
1457 } else {
1458 total = knownTotal;
1459 }
1460 // hash table for entries
1461 entries = new int[total * 3];
1462 tablelen = ((total/2) | 1); // Odd -> fewer collisions
1463 table = new int[tablelen];
1464 Arrays.fill(table, ZIP_ENDCHAIN);
1465 int idx = 0;
1466 int hash = 0;
1467 int next = -1;
1468
1469 // list for all meta entries
1470 ArrayList<Integer> metanamesList = null;
1471
1472 // Iterate through the entries in the central directory
1473 int i = 0;
1474 int hsh = 0;
1475 int pos = 0;
1476 int limit = cen.length - ENDHDR;
1477 while (pos + CENHDR <= limit) {
1478 if (i >= total) {
1479 // This will only happen if the zip file has an incorrect
1480 // ENDTOT field, which usually means it contains more than
1481 // 65535 entries.
1482 initCEN(countCENHeaders(cen, limit));
1483 return;
1484 }
1485 if (CENSIG(cen, pos) != CENSIG)
1486 zerror("invalid CEN header (bad signature)");
1487 int method = CENHOW(cen, pos);
1488 int nlen = CENNAM(cen, pos);
1489 int elen = CENEXT(cen, pos);
1490 int clen = CENCOM(cen, pos);
1491 if ((CENFLG(cen, pos) & 1) != 0)
1492 zerror("invalid CEN header (encrypted entry)");
1493 if (method != STORED && method != DEFLATED)
1494 zerror("invalid CEN header (bad compression method: " + method + ")");
1495 if (pos + CENHDR + nlen > limit)
1496 zerror("invalid CEN header (bad header size)");
1497 // Record the CEN offset and the name hash in our hash cell.
1498 hash = hashN(cen, pos + CENHDR, nlen);
1499 hsh = (hash & 0x7fffffff) % tablelen;
1500 next = table[hsh];
1501 table[hsh] = idx;
1502 idx = addEntry(idx, hash, next, pos);
1503 // Adds name to metanames.
1504 if (isMetaName(cen, pos + CENHDR, nlen)) {
1505 if (metanamesList == null)
1506 metanamesList = new ArrayList<>(4);
1507 metanamesList.add(pos);
1508 }
1509 // skip ext and comment
1510 pos += (CENHDR + nlen + elen + clen);
1511 i++;
1512 }
1513 total = i;
1514 if (metanamesList != null) {
1515 metanames = new int[metanamesList.size()];
1516 for (int j = 0, len = metanames.length; j < len; j++) {
1517 metanames[j] = metanamesList.get(j);
1518 }
1519 }
1520 if (pos + ENDHDR != cen.length) {
1521 zerror("invalid CEN header (bad header size)");
1522 }
1523 }
1524
1525 private static void zerror(String msg) throws ZipException {
1526 throw new ZipException(msg);
1527 }
1528
1529 /*
1530 * Returns the {@code pos} of the zip cen entry corresponding to the
1531 * specified entry name, or -1 if not found.
1532 */
1533 private int getEntryPos(byte[] name, boolean addSlash) {
1534 if (total == 0) {
1535 return -1;
1536 }
1537 int hsh = hashN(name, 0, name.length);
1538 int idx = table[(hsh & 0x7fffffff) % tablelen];
1539 /*
1540 * This while loop is an optimization where a double lookup
1541 * for name and name+/ is being performed. The name char
1542 * array has enough room at the end to try again with a
1543 * slash appended if the first table lookup does not succeed.
1544 */
1545 while(true) {
1546 /*
1547 * Search down the target hash chain for a entry whose
1548 * 32 bit hash matches the hashed name.
1549 */
1550 while (idx != ZIP_ENDCHAIN) {
1551 if (getEntryHash(idx) == hsh) {
1552 // The CEN name must match the specfied one
1553 int pos = getEntryPos(idx);
1554 if (name.length == CENNAM(cen, pos)) {
1555 boolean matched = true;
1556 int nameoff = pos + CENHDR;
1557 for (int i = 0; i < name.length; i++) {
1558 if (name[i] != cen[nameoff++]) {
1559 matched = false;
1560 break;
1561 }
1562 }
1563 if (matched) {
1564 return pos;
1565 }
1566 }
1567 }
1568 idx = getEntryNext(idx);
1569 }
1570 /* If not addSlash, or slash is already there, we are done */
1571 if (!addSlash || name.length == 0 || name[name.length - 1] == '/') {
1572 return -1;
1573 }
1574 /* Add slash and try once more */
1575 name = Arrays.copyOf(name, name.length + 1);
1576 name[name.length - 1] = '/';
1577 hsh = hash_append(hsh, (byte)'/');
1578 //idx = table[hsh % tablelen];
1579 idx = table[(hsh & 0x7fffffff) % tablelen];
1580 addSlash = false;
1581 }
1582 }
1583
1584 /**
1585 * Returns true if the bytes represent a non-directory name
1586 * beginning with "META-INF/", disregarding ASCII case.
1587 */
1588 private static boolean isMetaName(byte[] name, int off, int len) {
1589 // Use the "oldest ASCII trick in the book"
1590 return len > 9 // "META-INF/".length()
1591 && name[off + len - 1] != '/' // non-directory
1592 && (name[off++] | 0x20) == 'm'
1593 && (name[off++] | 0x20) == 'e'
1594 && (name[off++] | 0x20) == 't'
1595 && (name[off++] | 0x20) == 'a'
1596 && (name[off++] ) == '-'
1597 && (name[off++] | 0x20) == 'i'
1598 && (name[off++] | 0x20) == 'n'
1599 && (name[off++] | 0x20) == 'f'
1600 && (name[off] ) == '/';
1601 }
1602
1603 /**
1604 * Returns the number of CEN headers in a central directory.
1605 * Will not throw, even if the zip file is corrupt.
1606 *
1607 * @param cen copy of the bytes in a zip file's central directory
1608 * @param size number of bytes in central directory
1609 */
1610 private static int countCENHeaders(byte[] cen, int size) {
1611 int count = 0;
1612 for (int p = 0;
1613 p + CENHDR <= size;
1614 p += CENHDR + CENNAM(cen, p) + CENEXT(cen, p) + CENCOM(cen, p))
1615 count++;
1616 return count;
1617 }
1618 }
1619 }