1 /*
2 * Copyright (c) 2009, 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 jdk.nio.zipfs;
27
28 import java.io.BufferedOutputStream;
29 import java.io.ByteArrayInputStream;
30 import java.io.ByteArrayOutputStream;
31 import java.io.EOFException;
32 import java.io.File;
33 import java.io.FilterOutputStream;
34 import java.io.IOException;
35 import java.io.InputStream;
36 import java.io.OutputStream;
37 import java.nio.ByteBuffer;
38 import java.nio.MappedByteBuffer;
39 import java.nio.channels.*;
40 import java.nio.file.*;
41 import java.nio.file.attribute.*;
42 import java.nio.file.spi.*;
43 import java.security.AccessController;
44 import java.security.PrivilegedAction;
45 import java.security.PrivilegedActionException;
46 import java.security.PrivilegedExceptionAction;
47 import java.util.*;
48 import java.util.concurrent.locks.ReadWriteLock;
49 import java.util.concurrent.locks.ReentrantReadWriteLock;
50 import java.util.regex.Pattern;
51 import java.util.zip.CRC32;
52 import java.util.zip.Inflater;
53 import java.util.zip.Deflater;
54 import java.util.zip.InflaterInputStream;
55 import java.util.zip.DeflaterOutputStream;
56 import java.util.zip.ZipException;
57 import static java.lang.Boolean.*;
58 import static jdk.nio.zipfs.ZipConstants.*;
59 import static jdk.nio.zipfs.ZipUtils.*;
60 import static java.nio.file.StandardOpenOption.*;
61 import static java.nio.file.StandardCopyOption.*;
62
63 /**
64 * A FileSystem built on a zip file
65 *
66 * @author Xueming Shen
67 */
68
69 class ZipFileSystem extends FileSystem {
70
71 private final ZipFileSystemProvider provider;
72 private final Path zfpath;
73 final ZipCoder zc;
74 private final ZipPath rootdir;
75 private boolean readOnly = false; // readonly file system
76
77 // configurable by env map
78 private final boolean noExtt; // see readExtra()
79 private final boolean useTempFile; // use a temp file for newOS, default
80 // is to use BAOS for better performance
81 private static final boolean isWindows = AccessController.doPrivileged(
82 (PrivilegedAction<Boolean>) () -> System.getProperty("os.name")
83 .startsWith("Windows"));
84 private final boolean forceEnd64;
85 private final int defaultMethod; // METHOD_STORED if "noCompression=true"
86 // METHOD_DEFLATED otherwise
87
88 ZipFileSystem(ZipFileSystemProvider provider,
89 Path zfpath,
90 Map<String, ?> env) throws IOException
91 {
92 // default encoding for name/comment
93 String nameEncoding = env.containsKey("encoding") ?
94 (String)env.get("encoding") : "UTF-8";
95 this.noExtt = "false".equals(env.get("zipinfo-time"));
96 this.useTempFile = isTrue(env, "useTempFile");
97 this.forceEnd64 = isTrue(env, "forceZIP64End");
98 this.defaultMethod = isTrue(env, "noCompression") ? METHOD_STORED: METHOD_DEFLATED;
99 if (Files.notExists(zfpath)) {
100 // create a new zip if not exists
101 if (isTrue(env, "create")) {
102 try (OutputStream os = Files.newOutputStream(zfpath, CREATE_NEW, WRITE)) {
103 new END().write(os, 0, forceEnd64);
104 }
105 } else {
106 throw new FileSystemNotFoundException(zfpath.toString());
107 }
108 }
109 // sm and existence check
110 zfpath.getFileSystem().provider().checkAccess(zfpath, AccessMode.READ);
111 boolean writeable = AccessController.doPrivileged(
112 (PrivilegedAction<Boolean>) () -> Files.isWritable(zfpath));
113 this.readOnly = !writeable;
114 this.zc = ZipCoder.get(nameEncoding);
115 this.rootdir = new ZipPath(this, new byte[]{'/'});
116 this.ch = Files.newByteChannel(zfpath, READ);
117 try {
118 this.cen = initCEN();
119 } catch (IOException x) {
120 try {
121 this.ch.close();
122 } catch (IOException xx) {
123 x.addSuppressed(xx);
124 }
125 throw x;
126 }
127 this.provider = provider;
128 this.zfpath = zfpath;
129 }
130
131 // returns true if there is a name=true/"true" setting in env
132 private static boolean isTrue(Map<String, ?> env, String name) {
133 return "true".equals(env.get(name)) || TRUE.equals(env.get(name));
134 }
135
136 @Override
137 public FileSystemProvider provider() {
138 return provider;
139 }
140
141 @Override
142 public String getSeparator() {
143 return "/";
144 }
145
146 @Override
147 public boolean isOpen() {
148 return isOpen;
149 }
150
151 @Override
152 public boolean isReadOnly() {
153 return readOnly;
154 }
155
156 private void checkWritable() throws IOException {
157 if (readOnly)
158 throw new ReadOnlyFileSystemException();
159 }
160
161 void setReadOnly() {
162 this.readOnly = true;
163 }
164
165 @Override
166 public Iterable<Path> getRootDirectories() {
167 return List.of(rootdir);
168 }
169
170 ZipPath getRootDir() {
171 return rootdir;
172 }
173
174 @Override
175 public ZipPath getPath(String first, String... more) {
176 if (more.length == 0) {
177 return new ZipPath(this, first);
178 }
179 StringBuilder sb = new StringBuilder();
180 sb.append(first);
181 for (String path : more) {
182 if (path.length() > 0) {
183 if (sb.length() > 0) {
184 sb.append('/');
185 }
186 sb.append(path);
187 }
188 }
189 return new ZipPath(this, sb.toString());
190 }
191
192 @Override
193 public UserPrincipalLookupService getUserPrincipalLookupService() {
194 throw new UnsupportedOperationException();
195 }
196
197 @Override
198 public WatchService newWatchService() {
199 throw new UnsupportedOperationException();
200 }
201
202 FileStore getFileStore(ZipPath path) {
203 return new ZipFileStore(path);
204 }
205
206 @Override
207 public Iterable<FileStore> getFileStores() {
208 return List.of(new ZipFileStore(rootdir));
209 }
210
211 private static final Set<String> supportedFileAttributeViews =
212 Set.of("basic", "zip");
213
214 @Override
215 public Set<String> supportedFileAttributeViews() {
216 return supportedFileAttributeViews;
217 }
218
219 @Override
220 public String toString() {
221 return zfpath.toString();
222 }
223
224 Path getZipFile() {
225 return zfpath;
226 }
227
228 private static final String GLOB_SYNTAX = "glob";
229 private static final String REGEX_SYNTAX = "regex";
230
231 @Override
232 public PathMatcher getPathMatcher(String syntaxAndInput) {
233 int pos = syntaxAndInput.indexOf(':');
234 if (pos <= 0 || pos == syntaxAndInput.length()) {
235 throw new IllegalArgumentException();
236 }
237 String syntax = syntaxAndInput.substring(0, pos);
238 String input = syntaxAndInput.substring(pos + 1);
239 String expr;
240 if (syntax.equalsIgnoreCase(GLOB_SYNTAX)) {
241 expr = toRegexPattern(input);
242 } else {
243 if (syntax.equalsIgnoreCase(REGEX_SYNTAX)) {
244 expr = input;
245 } else {
246 throw new UnsupportedOperationException("Syntax '" + syntax +
247 "' not recognized");
248 }
249 }
250 // return matcher
251 final Pattern pattern = Pattern.compile(expr);
252 return new PathMatcher() {
253 @Override
254 public boolean matches(Path path) {
255 return pattern.matcher(path.toString()).matches();
256 }
257 };
258 }
259
260 @Override
261 public void close() throws IOException {
262 beginWrite();
263 try {
264 if (!isOpen)
265 return;
266 isOpen = false; // set closed
267 } finally {
268 endWrite();
269 }
270 if (!streams.isEmpty()) { // unlock and close all remaining streams
271 Set<InputStream> copy = new HashSet<>(streams);
272 for (InputStream is: copy)
273 is.close();
274 }
275 beginWrite(); // lock and sync
276 try {
277 AccessController.doPrivileged((PrivilegedExceptionAction<Void>) () -> {
278 sync(); return null;
279 });
280 ch.close(); // close the ch just in case no update
281 // and sync didn't close the ch
282 } catch (PrivilegedActionException e) {
283 throw (IOException)e.getException();
284 } finally {
285 endWrite();
286 }
287
288 synchronized (inflaters) {
289 for (Inflater inf : inflaters)
290 inf.end();
291 }
292 synchronized (deflaters) {
293 for (Deflater def : deflaters)
294 def.end();
295 }
296
297 IOException ioe = null;
298 synchronized (tmppaths) {
299 for (Path p: tmppaths) {
300 try {
301 AccessController.doPrivileged(
302 (PrivilegedExceptionAction<Boolean>)() -> Files.deleteIfExists(p));
303 } catch (PrivilegedActionException e) {
304 IOException x = (IOException)e.getException();
305 if (ioe == null)
306 ioe = x;
307 else
308 ioe.addSuppressed(x);
309 }
310 }
311 }
312 provider.removeFileSystem(zfpath, this);
313 if (ioe != null)
314 throw ioe;
315 }
316
317 ZipFileAttributes getFileAttributes(byte[] path)
318 throws IOException
319 {
320 Entry e;
321 beginRead();
322 try {
323 ensureOpen();
324 e = getEntry(path);
325 if (e == null) {
326 IndexNode inode = getInode(path);
327 if (inode == null)
328 return null;
329 // pseudo directory, uses METHOD_STORED
330 e = new Entry(inode.name, inode.isdir, METHOD_STORED);
331 e.mtime = e.atime = e.ctime = zfsDefaultTimeStamp;
332 }
333 } finally {
334 endRead();
335 }
336 return e;
337 }
338
339 void checkAccess(byte[] path) throws IOException {
340 beginRead();
341 try {
342 ensureOpen();
343 // is it necessary to readCEN as a sanity check?
344 if (getInode(path) == null) {
345 throw new NoSuchFileException(toString());
346 }
347
348 } finally {
349 endRead();
350 }
351 }
352
353 void setTimes(byte[] path, FileTime mtime, FileTime atime, FileTime ctime)
354 throws IOException
355 {
356 checkWritable();
357 beginWrite();
358 try {
359 ensureOpen();
360 Entry e = getEntry(path); // ensureOpen checked
361 if (e == null)
362 throw new NoSuchFileException(getString(path));
363 if (e.type == Entry.CEN)
364 e.type = Entry.COPY; // copy e
365 if (mtime != null)
366 e.mtime = mtime.toMillis();
367 if (atime != null)
368 e.atime = atime.toMillis();
369 if (ctime != null)
370 e.ctime = ctime.toMillis();
371 update(e);
372 } finally {
373 endWrite();
374 }
375 }
376
377 boolean exists(byte[] path)
378 throws IOException
379 {
380 beginRead();
381 try {
382 ensureOpen();
383 return getInode(path) != null;
384 } finally {
385 endRead();
386 }
387 }
388
389 boolean isDirectory(byte[] path)
390 throws IOException
391 {
392 beginRead();
393 try {
394 IndexNode n = getInode(path);
395 return n != null && n.isDir();
396 } finally {
397 endRead();
398 }
399 }
400
401 // returns the list of child paths of "path"
402 Iterator<Path> iteratorOf(byte[] path,
403 DirectoryStream.Filter<? super Path> filter)
404 throws IOException
405 {
406 beginWrite(); // iteration of inodes needs exclusive lock
407 try {
408 ensureOpen();
409 IndexNode inode = getInode(path);
410 if (inode == null)
411 throw new NotDirectoryException(getString(path));
412 List<Path> list = new ArrayList<>();
413 IndexNode child = inode.child;
414 while (child != null) {
415 // assume all path from zip file itself is "normalized"
416 ZipPath zp = new ZipPath(this, child.name, true);
417 if (filter == null || filter.accept(zp))
418 list.add(zp);
419 child = child.sibling;
420 }
421 return list.iterator();
422 } finally {
423 endWrite();
424 }
425 }
426
427 void createDirectory(byte[] dir, FileAttribute<?>... attrs)
428 throws IOException
429 {
430 checkWritable();
431 // dir = toDirectoryPath(dir);
432 beginWrite();
433 try {
434 ensureOpen();
435 if (dir.length == 0 || exists(dir)) // root dir, or exiting dir
436 throw new FileAlreadyExistsException(getString(dir));
437 checkParents(dir);
438 Entry e = new Entry(dir, Entry.NEW, true, METHOD_STORED);
439 update(e);
440 } finally {
441 endWrite();
442 }
443 }
444
445 void copyFile(boolean deletesrc, byte[]src, byte[] dst, CopyOption... options)
446 throws IOException
447 {
448 checkWritable();
449 if (Arrays.equals(src, dst))
450 return; // do nothing, src and dst are the same
451
452 beginWrite();
453 try {
454 ensureOpen();
455 Entry eSrc = getEntry(src); // ensureOpen checked
456
457 if (eSrc == null)
458 throw new NoSuchFileException(getString(src));
459 if (eSrc.isDir()) { // spec says to create dst dir
460 createDirectory(dst);
461 return;
462 }
463 boolean hasReplace = false;
464 boolean hasCopyAttrs = false;
465 for (CopyOption opt : options) {
466 if (opt == REPLACE_EXISTING)
467 hasReplace = true;
468 else if (opt == COPY_ATTRIBUTES)
469 hasCopyAttrs = true;
470 }
471 Entry eDst = getEntry(dst);
472 if (eDst != null) {
473 if (!hasReplace)
474 throw new FileAlreadyExistsException(getString(dst));
475 } else {
476 checkParents(dst);
477 }
478 Entry u = new Entry(eSrc, Entry.COPY); // copy eSrc entry
479 u.name(dst); // change name
480 if (eSrc.type == Entry.NEW || eSrc.type == Entry.FILECH)
481 {
482 u.type = eSrc.type; // make it the same type
483 if (deletesrc) { // if it's a "rename", take the data
484 u.bytes = eSrc.bytes;
485 u.file = eSrc.file;
486 } else { // if it's not "rename", copy the data
487 if (eSrc.bytes != null)
488 u.bytes = Arrays.copyOf(eSrc.bytes, eSrc.bytes.length);
489 else if (eSrc.file != null) {
490 u.file = getTempPathForEntry(null);
491 Files.copy(eSrc.file, u.file, REPLACE_EXISTING);
492 }
493 }
494 }
495 if (!hasCopyAttrs)
496 u.mtime = u.atime= u.ctime = System.currentTimeMillis();
497 update(u);
498 if (deletesrc)
499 updateDelete(eSrc);
500 } finally {
501 endWrite();
502 }
503 }
504
505 // Returns an output stream for writing the contents into the specified
506 // entry.
507 OutputStream newOutputStream(byte[] path, OpenOption... options)
508 throws IOException
509 {
510 checkWritable();
511 boolean hasCreateNew = false;
512 boolean hasCreate = false;
513 boolean hasAppend = false;
514 boolean hasTruncate = false;
515 for (OpenOption opt: options) {
516 if (opt == READ)
517 throw new IllegalArgumentException("READ not allowed");
518 if (opt == CREATE_NEW)
519 hasCreateNew = true;
520 if (opt == CREATE)
521 hasCreate = true;
522 if (opt == APPEND)
523 hasAppend = true;
524 if (opt == TRUNCATE_EXISTING)
525 hasTruncate = true;
526 }
527 if (hasAppend && hasTruncate)
528 throw new IllegalArgumentException("APPEND + TRUNCATE_EXISTING not allowed");
529 beginRead(); // only need a readlock, the "update()" will
530 try { // try to obtain a writelock when the os is
531 ensureOpen(); // being closed.
532 Entry e = getEntry(path);
533 if (e != null) {
534 if (e.isDir() || hasCreateNew)
535 throw new FileAlreadyExistsException(getString(path));
536 if (hasAppend) {
537 InputStream is = getInputStream(e);
538 OutputStream os = getOutputStream(new Entry(e, Entry.NEW));
539 is.transferTo(os);
540 is.close();
541 return os;
542 }
543 return getOutputStream(new Entry(e, Entry.NEW));
544 } else {
545 if (!hasCreate && !hasCreateNew)
546 throw new NoSuchFileException(getString(path));
547 checkParents(path);
548 return getOutputStream(new Entry(path, Entry.NEW, false, defaultMethod));
549 }
550 } finally {
551 endRead();
552 }
553 }
554
555 // Returns an input stream for reading the contents of the specified
556 // file entry.
557 InputStream newInputStream(byte[] path) throws IOException {
558 beginRead();
559 try {
560 ensureOpen();
561 Entry e = getEntry(path);
562 if (e == null)
563 throw new NoSuchFileException(getString(path));
564 if (e.isDir())
565 throw new FileSystemException(getString(path), "is a directory", null);
566 return getInputStream(e);
567 } finally {
568 endRead();
569 }
570 }
571
572 private void checkOptions(Set<? extends OpenOption> options) {
573 // check for options of null type and option is an intance of StandardOpenOption
574 for (OpenOption option : options) {
575 if (option == null)
576 throw new NullPointerException();
577 if (!(option instanceof StandardOpenOption))
578 throw new IllegalArgumentException();
579 }
580 if (options.contains(APPEND) && options.contains(TRUNCATE_EXISTING))
581 throw new IllegalArgumentException("APPEND + TRUNCATE_EXISTING not allowed");
582 }
583
584
585 // Returns an output SeekableByteChannel for either
586 // (1) writing the contents of a new entry, if the entry doesn't exit, or
587 // (2) updating/replacing the contents of an existing entry.
588 // Note: The content is not compressed.
589 private class EntryOutputChannel extends ByteArrayChannel {
590 Entry e;
591
592 EntryOutputChannel(Entry e) throws IOException {
593 super(e.size > 0? (int)e.size : 8192, false);
594 this.e = e;
595 if (e.mtime == -1)
596 e.mtime = System.currentTimeMillis();
597 if (e.method == -1)
598 e.method = defaultMethod;
599 // store size, compressed size, and crc-32 in datadescriptor
600 e.flag = FLAG_DATADESCR;
601 if (zc.isUTF8())
602 e.flag |= FLAG_USE_UTF8;
603 }
604
605 @Override
606 public void close() throws IOException {
607 e.bytes = toByteArray();
608 e.size = e.bytes.length;
609 e.crc = -1;
610 super.close();
611 update(e);
612 }
613 }
614
615 // Returns a Writable/ReadByteChannel for now. Might consdier to use
616 // newFileChannel() instead, which dump the entry data into a regular
617 // file on the default file system and create a FileChannel on top of
618 // it.
619 SeekableByteChannel newByteChannel(byte[] path,
620 Set<? extends OpenOption> options,
621 FileAttribute<?>... attrs)
622 throws IOException
623 {
624 checkOptions(options);
625 if (options.contains(StandardOpenOption.WRITE) ||
626 options.contains(StandardOpenOption.APPEND)) {
627 checkWritable();
628 beginRead(); // only need a readlock, the "update()" will obtain
629 // thewritelock when the channel is closed
630 try {
631 ensureOpen();
632 Entry e = getEntry(path);
633 if (e != null) {
634 if (e.isDir() || options.contains(CREATE_NEW))
635 throw new FileAlreadyExistsException(getString(path));
636 SeekableByteChannel sbc =
637 new EntryOutputChannel(new Entry(e, Entry.NEW));
638 if (options.contains(APPEND)) {
639 try (InputStream is = getInputStream(e)) { // copyover
640 byte[] buf = new byte[8192];
641 ByteBuffer bb = ByteBuffer.wrap(buf);
642 int n;
643 while ((n = is.read(buf)) != -1) {
644 bb.position(0);
645 bb.limit(n);
646 sbc.write(bb);
647 }
648 }
649 }
650 return sbc;
651 }
652 if (!options.contains(CREATE) && !options.contains(CREATE_NEW))
653 throw new NoSuchFileException(getString(path));
654 checkParents(path);
655 return new EntryOutputChannel(
656 new Entry(path, Entry.NEW, false, defaultMethod));
657
658 } finally {
659 endRead();
660 }
661 } else {
662 beginRead();
663 try {
664 ensureOpen();
665 Entry e = getEntry(path);
666 if (e == null || e.isDir())
667 throw new NoSuchFileException(getString(path));
668 try (InputStream is = getInputStream(e)) {
669 // TBD: if (e.size < NNNNN);
670 return new ByteArrayChannel(is.readAllBytes(), true);
671 }
672 } finally {
673 endRead();
674 }
675 }
676 }
677
678 // Returns a FileChannel of the specified entry.
679 //
680 // This implementation creates a temporary file on the default file system,
681 // copy the entry data into it if the entry exists, and then create a
682 // FileChannel on top of it.
683 FileChannel newFileChannel(byte[] path,
684 Set<? extends OpenOption> options,
685 FileAttribute<?>... attrs)
686 throws IOException
687 {
688 checkOptions(options);
689 final boolean forWrite = (options.contains(StandardOpenOption.WRITE) ||
690 options.contains(StandardOpenOption.APPEND));
691 beginRead();
692 try {
693 ensureOpen();
694 Entry e = getEntry(path);
695 if (forWrite) {
696 checkWritable();
697 if (e == null) {
698 if (!options.contains(StandardOpenOption.CREATE) &&
699 !options.contains(StandardOpenOption.CREATE_NEW)) {
700 throw new NoSuchFileException(getString(path));
701 }
702 } else {
703 if (options.contains(StandardOpenOption.CREATE_NEW)) {
704 throw new FileAlreadyExistsException(getString(path));
705 }
706 if (e.isDir())
707 throw new FileAlreadyExistsException("directory <"
708 + getString(path) + "> exists");
709 }
710 options = new HashSet<>(options);
711 options.remove(StandardOpenOption.CREATE_NEW); // for tmpfile
712 } else if (e == null || e.isDir()) {
713 throw new NoSuchFileException(getString(path));
714 }
715
716 final boolean isFCH = (e != null && e.type == Entry.FILECH);
717 final Path tmpfile = isFCH ? e.file : getTempPathForEntry(path);
718 final FileChannel fch = tmpfile.getFileSystem()
719 .provider()
720 .newFileChannel(tmpfile, options, attrs);
721 final Entry u = isFCH ? e : new Entry(path, tmpfile, Entry.FILECH);
722 if (forWrite) {
723 u.flag = FLAG_DATADESCR;
724 u.method = METHOD_DEFLATED;
725 }
726 // is there a better way to hook into the FileChannel's close method?
727 return new FileChannel() {
728 public int write(ByteBuffer src) throws IOException {
729 return fch.write(src);
730 }
731 public long write(ByteBuffer[] srcs, int offset, int length)
732 throws IOException
733 {
734 return fch.write(srcs, offset, length);
735 }
736 public long position() throws IOException {
737 return fch.position();
738 }
739 public FileChannel position(long newPosition)
740 throws IOException
741 {
742 fch.position(newPosition);
743 return this;
744 }
745 public long size() throws IOException {
746 return fch.size();
747 }
748 public FileChannel truncate(long size)
749 throws IOException
750 {
751 fch.truncate(size);
752 return this;
753 }
754 public void force(boolean metaData)
755 throws IOException
756 {
757 fch.force(metaData);
758 }
759 public long transferTo(long position, long count,
760 WritableByteChannel target)
761 throws IOException
762 {
763 return fch.transferTo(position, count, target);
764 }
765 public long transferFrom(ReadableByteChannel src,
766 long position, long count)
767 throws IOException
768 {
769 return fch.transferFrom(src, position, count);
770 }
771 public int read(ByteBuffer dst) throws IOException {
772 return fch.read(dst);
773 }
774 public int read(ByteBuffer dst, long position)
775 throws IOException
776 {
777 return fch.read(dst, position);
778 }
779 public long read(ByteBuffer[] dsts, int offset, int length)
780 throws IOException
781 {
782 return fch.read(dsts, offset, length);
783 }
784 public int write(ByteBuffer src, long position)
785 throws IOException
786 {
787 return fch.write(src, position);
788 }
789 public MappedByteBuffer map(MapMode mode,
790 long position, long size)
791 throws IOException
792 {
793 throw new UnsupportedOperationException();
794 }
795 public FileLock lock(long position, long size, boolean shared)
796 throws IOException
797 {
798 return fch.lock(position, size, shared);
799 }
800 public FileLock tryLock(long position, long size, boolean shared)
801 throws IOException
802 {
803 return fch.tryLock(position, size, shared);
804 }
805 protected void implCloseChannel() throws IOException {
806 fch.close();
807 if (forWrite) {
808 u.mtime = System.currentTimeMillis();
809 u.size = Files.size(u.file);
810
811 update(u);
812 } else {
813 if (!isFCH) // if this is a new fch for reading
814 removeTempPathForEntry(tmpfile);
815 }
816 }
817 };
818 } finally {
819 endRead();
820 }
821 }
822
823 // the outstanding input streams that need to be closed
824 private Set<InputStream> streams =
825 Collections.synchronizedSet(new HashSet<InputStream>());
826
827 private Set<Path> tmppaths = Collections.synchronizedSet(new HashSet<Path>());
828 private Path getTempPathForEntry(byte[] path) throws IOException {
829 Path tmpPath = createTempFileInSameDirectoryAs(zfpath);
830 if (path != null) {
831 Entry e = getEntry(path);
832 if (e != null) {
833 try (InputStream is = newInputStream(path)) {
834 Files.copy(is, tmpPath, REPLACE_EXISTING);
835 }
836 }
837 }
838 return tmpPath;
839 }
840
841 private void removeTempPathForEntry(Path path) throws IOException {
842 Files.delete(path);
843 tmppaths.remove(path);
844 }
845
846 // check if all parents really exit. ZIP spec does not require
847 // the existence of any "parent directory".
848 private void checkParents(byte[] path) throws IOException {
849 beginRead();
850 try {
851 while ((path = getParent(path)) != null &&
852 path != ROOTPATH) {
853 if (!inodes.containsKey(IndexNode.keyOf(path))) {
854 throw new NoSuchFileException(getString(path));
855 }
856 }
857 } finally {
858 endRead();
859 }
860 }
861
862 private static byte[] ROOTPATH = new byte[] { '/' };
863 private static byte[] getParent(byte[] path) {
864 int off = getParentOff(path);
865 if (off <= 1)
866 return ROOTPATH;
867 return Arrays.copyOf(path, off);
868 }
869
870 private static int getParentOff(byte[] path) {
871 int off = path.length - 1;
872 if (off > 0 && path[off] == '/') // isDirectory
873 off--;
874 while (off > 0 && path[off] != '/') { off--; }
875 return off;
876 }
877
878 private final void beginWrite() {
879 rwlock.writeLock().lock();
880 }
881
882 private final void endWrite() {
883 rwlock.writeLock().unlock();
884 }
885
886 private final void beginRead() {
887 rwlock.readLock().lock();
888 }
889
890 private final void endRead() {
891 rwlock.readLock().unlock();
892 }
893
894 ///////////////////////////////////////////////////////////////////
895
896 private volatile boolean isOpen = true;
897 private final SeekableByteChannel ch; // channel to the zipfile
898 final byte[] cen; // CEN & ENDHDR
899 private END end;
900 private long locpos; // position of first LOC header (usually 0)
901
902 private final ReadWriteLock rwlock = new ReentrantReadWriteLock();
903
904 // name -> pos (in cen), IndexNode itself can be used as a "key"
905 private LinkedHashMap<IndexNode, IndexNode> inodes;
906
907 final byte[] getBytes(String name) {
908 return zc.getBytes(name);
909 }
910
911 final String getString(byte[] name) {
912 return zc.toString(name);
913 }
914
915 @SuppressWarnings("deprecation")
916 protected void finalize() throws IOException {
917 close();
918 }
919
920 // Reads len bytes of data from the specified offset into buf.
921 // Returns the total number of bytes read.
922 // Each/every byte read from here (except the cen, which is mapped).
923 final long readFullyAt(byte[] buf, int off, long len, long pos)
924 throws IOException
925 {
926 ByteBuffer bb = ByteBuffer.wrap(buf);
927 bb.position(off);
928 bb.limit((int)(off + len));
929 return readFullyAt(bb, pos);
930 }
931
932 private final long readFullyAt(ByteBuffer bb, long pos)
933 throws IOException
934 {
935 synchronized(ch) {
936 return ch.position(pos).read(bb);
937 }
938 }
939
940 // Searches for end of central directory (END) header. The contents of
941 // the END header will be read and placed in endbuf. Returns the file
942 // position of the END header, otherwise returns -1 if the END header
943 // was not found or an error occurred.
944 private END findEND() throws IOException
945 {
946 byte[] buf = new byte[READBLOCKSZ];
947 long ziplen = ch.size();
948 long minHDR = (ziplen - END_MAXLEN) > 0 ? ziplen - END_MAXLEN : 0;
949 long minPos = minHDR - (buf.length - ENDHDR);
950
951 for (long pos = ziplen - buf.length; pos >= minPos; pos -= (buf.length - ENDHDR))
952 {
953 int off = 0;
954 if (pos < 0) {
955 // Pretend there are some NUL bytes before start of file
956 off = (int)-pos;
957 Arrays.fill(buf, 0, off, (byte)0);
958 }
959 int len = buf.length - off;
960 if (readFullyAt(buf, off, len, pos + off) != len)
961 zerror("zip END header not found");
962
963 // Now scan the block backwards for END header signature
964 for (int i = buf.length - ENDHDR; i >= 0; i--) {
965 if (buf[i+0] == (byte)'P' &&
966 buf[i+1] == (byte)'K' &&
967 buf[i+2] == (byte)'\005' &&
968 buf[i+3] == (byte)'\006' &&
969 (pos + i + ENDHDR + ENDCOM(buf, i) == ziplen)) {
970 // Found END header
971 buf = Arrays.copyOfRange(buf, i, i + ENDHDR);
972 END end = new END();
973 end.endsub = ENDSUB(buf);
974 end.centot = ENDTOT(buf);
975 end.cenlen = ENDSIZ(buf);
976 end.cenoff = ENDOFF(buf);
977 end.comlen = ENDCOM(buf);
978 end.endpos = pos + i;
979 // try if there is zip64 end;
980 byte[] loc64 = new byte[ZIP64_LOCHDR];
981 if (end.endpos < ZIP64_LOCHDR ||
982 readFullyAt(loc64, 0, loc64.length, end.endpos - ZIP64_LOCHDR)
983 != loc64.length ||
984 !locator64SigAt(loc64, 0)) {
985 return end;
986 }
987 long end64pos = ZIP64_LOCOFF(loc64);
988 byte[] end64buf = new byte[ZIP64_ENDHDR];
989 if (readFullyAt(end64buf, 0, end64buf.length, end64pos)
990 != end64buf.length ||
991 !end64SigAt(end64buf, 0)) {
992 return end;
993 }
994 // end64 found,
995 long cenlen64 = ZIP64_ENDSIZ(end64buf);
996 long cenoff64 = ZIP64_ENDOFF(end64buf);
997 long centot64 = ZIP64_ENDTOT(end64buf);
998 // double-check
999 if (cenlen64 != end.cenlen && end.cenlen != ZIP64_MINVAL ||
1000 cenoff64 != end.cenoff && end.cenoff != ZIP64_MINVAL ||
1001 centot64 != end.centot && end.centot != ZIP64_MINVAL32) {
1002 return end;
1003 }
1004 // to use the end64 values
1005 end.cenlen = cenlen64;
1006 end.cenoff = cenoff64;
1007 end.centot = (int)centot64; // assume total < 2g
1008 end.endpos = end64pos;
1009 return end;
1010 }
1011 }
1012 }
1013 zerror("zip END header not found");
1014 return null; //make compiler happy
1015 }
1016
1017 // Reads zip file central directory. Returns the file position of first
1018 // CEN header, otherwise returns -1 if an error occurred. If zip->msg != NULL
1019 // then the error was a zip format error and zip->msg has the error text.
1020 // Always pass in -1 for knownTotal; it's used for a recursive call.
1021 private byte[] initCEN() throws IOException {
1022 end = findEND();
1023 if (end.endpos == 0) {
1024 inodes = new LinkedHashMap<>(10);
1025 locpos = 0;
1026 buildNodeTree();
1027 return null; // only END header present
1028 }
1029 if (end.cenlen > end.endpos)
1030 zerror("invalid END header (bad central directory size)");
1031 long cenpos = end.endpos - end.cenlen; // position of CEN table
1032
1033 // Get position of first local file (LOC) header, taking into
1034 // account that there may be a stub prefixed to the zip file.
1035 locpos = cenpos - end.cenoff;
1036 if (locpos < 0)
1037 zerror("invalid END header (bad central directory offset)");
1038
1039 // read in the CEN and END
1040 byte[] cen = new byte[(int)(end.cenlen + ENDHDR)];
1041 if (readFullyAt(cen, 0, cen.length, cenpos) != end.cenlen + ENDHDR) {
1042 zerror("read CEN tables failed");
1043 }
1044 // Iterate through the entries in the central directory
1045 inodes = new LinkedHashMap<>(end.centot + 1);
1046 int pos = 0;
1047 int limit = cen.length - ENDHDR;
1048 while (pos < limit) {
1049 if (!cenSigAt(cen, pos))
1050 zerror("invalid CEN header (bad signature)");
1051 int method = CENHOW(cen, pos);
1052 int nlen = CENNAM(cen, pos);
1053 int elen = CENEXT(cen, pos);
1054 int clen = CENCOM(cen, pos);
1055 if ((CENFLG(cen, pos) & 1) != 0) {
1056 zerror("invalid CEN header (encrypted entry)");
1057 }
1058 if (method != METHOD_STORED && method != METHOD_DEFLATED) {
1059 zerror("invalid CEN header (unsupported compression method: " + method + ")");
1060 }
1061 if (pos + CENHDR + nlen > limit) {
1062 zerror("invalid CEN header (bad header size)");
1063 }
1064 IndexNode inode = new IndexNode(cen, pos, nlen);
1065 inodes.put(inode, inode);
1066
1067 // skip ext and comment
1068 pos += (CENHDR + nlen + elen + clen);
1069 }
1070 if (pos + ENDHDR != cen.length) {
1071 zerror("invalid CEN header (bad header size)");
1072 }
1073 buildNodeTree();
1074 return cen;
1075 }
1076
1077 private void ensureOpen() throws IOException {
1078 if (!isOpen)
1079 throw new ClosedFileSystemException();
1080 }
1081
1082 // Creates a new empty temporary file in the same directory as the
1083 // specified file. A variant of Files.createTempFile.
1084 private Path createTempFileInSameDirectoryAs(Path path)
1085 throws IOException
1086 {
1087 Path parent = path.toAbsolutePath().getParent();
1088 Path dir = (parent == null) ? path.getFileSystem().getPath(".") : parent;
1089 Path tmpPath = Files.createTempFile(dir, "zipfstmp", null);
1090 tmppaths.add(tmpPath);
1091 return tmpPath;
1092 }
1093
1094 ////////////////////update & sync //////////////////////////////////////
1095
1096 private boolean hasUpdate = false;
1097
1098 // shared key. consumer guarantees the "writeLock" before use it.
1099 private final IndexNode LOOKUPKEY = new IndexNode(null, -1);
1100
1101 private void updateDelete(IndexNode inode) {
1102 beginWrite();
1103 try {
1104 removeFromTree(inode);
1105 inodes.remove(inode);
1106 hasUpdate = true;
1107 } finally {
1108 endWrite();
1109 }
1110 }
1111
1112 private void update(Entry e) {
1113 beginWrite();
1114 try {
1115 IndexNode old = inodes.put(e, e);
1116 if (old != null) {
1117 removeFromTree(old);
1118 }
1119 if (e.type == Entry.NEW || e.type == Entry.FILECH || e.type == Entry.COPY) {
1120 IndexNode parent = inodes.get(LOOKUPKEY.as(getParent(e.name)));
1121 e.sibling = parent.child;
1122 parent.child = e;
1123 }
1124 hasUpdate = true;
1125 } finally {
1126 endWrite();
1127 }
1128 }
1129
1130 // copy over the whole LOC entry (header if necessary, data and ext) from
1131 // old zip to the new one.
1132 private long copyLOCEntry(Entry e, boolean updateHeader,
1133 OutputStream os,
1134 long written, byte[] buf)
1135 throws IOException
1136 {
1137 long locoff = e.locoff; // where to read
1138 e.locoff = written; // update the e.locoff with new value
1139
1140 // calculate the size need to write out
1141 long size = 0;
1142 // if there is A ext
1143 if ((e.flag & FLAG_DATADESCR) != 0) {
1144 if (e.size >= ZIP64_MINVAL || e.csize >= ZIP64_MINVAL)
1145 size = 24;
1146 else
1147 size = 16;
1148 }
1149 // read loc, use the original loc.elen/nlen
1150 //
1151 // an extra byte after loc is read, which should be the first byte of the
1152 // 'name' field of the loc. if this byte is '/', which means the original
1153 // entry has an absolute path in original zip/jar file, the e.writeLOC()
1154 // is used to output the loc, in which the leading "/" will be removed
1155 if (readFullyAt(buf, 0, LOCHDR + 1 , locoff) != LOCHDR + 1)
1156 throw new ZipException("loc: reading failed");
1157
1158 if (updateHeader || LOCNAM(buf) > 0 && buf[LOCHDR] == '/') {
1159 locoff += LOCHDR + LOCNAM(buf) + LOCEXT(buf); // skip header
1160 size += e.csize;
1161 written = e.writeLOC(os) + size;
1162 } else {
1163 os.write(buf, 0, LOCHDR); // write out the loc header
1164 locoff += LOCHDR;
1165 // use e.csize, LOCSIZ(buf) is zero if FLAG_DATADESCR is on
1166 // size += LOCNAM(buf) + LOCEXT(buf) + LOCSIZ(buf);
1167 size += LOCNAM(buf) + LOCEXT(buf) + e.csize;
1168 written = LOCHDR + size;
1169 }
1170 int n;
1171 while (size > 0 &&
1172 (n = (int)readFullyAt(buf, 0, buf.length, locoff)) != -1)
1173 {
1174 if (size < n)
1175 n = (int)size;
1176 os.write(buf, 0, n);
1177 size -= n;
1178 locoff += n;
1179 }
1180 return written;
1181 }
1182
1183 private long writeEntry(Entry e, OutputStream os, byte[] buf)
1184 throws IOException {
1185
1186 if (e.bytes == null && e.file == null) // dir, 0-length data
1187 return 0;
1188
1189 long written = 0;
1190 try (OutputStream os2 = e.method == METHOD_STORED ?
1191 new EntryOutputStreamCRC32(e, os) : new EntryOutputStreamDef(e, os)) {
1192 if (e.bytes != null) { // in-memory
1193 os2.write(e.bytes, 0, e.bytes.length);
1194 } else if (e.file != null) { // tmp file
1195 if (e.type == Entry.NEW || e.type == Entry.FILECH) {
1196 try (InputStream is = Files.newInputStream(e.file)) {
1197 is.transferTo(os2);
1198 }
1199 }
1200 Files.delete(e.file);
1201 tmppaths.remove(e.file);
1202 }
1203 }
1204 written += e.csize;
1205 if ((e.flag & FLAG_DATADESCR) != 0) {
1206 written += e.writeEXT(os);
1207 }
1208 return written;
1209 }
1210
1211 // sync the zip file system, if there is any udpate
1212 private void sync() throws IOException {
1213
1214 if (!hasUpdate)
1215 return;
1216 Path tmpFile = createTempFileInSameDirectoryAs(zfpath);
1217 try (OutputStream os = new BufferedOutputStream(Files.newOutputStream(tmpFile, WRITE)))
1218 {
1219 ArrayList<Entry> elist = new ArrayList<>(inodes.size());
1220 long written = 0;
1221 byte[] buf = new byte[8192];
1222 Entry e = null;
1223
1224 // write loc
1225 for (IndexNode inode : inodes.values()) {
1226 if (inode instanceof Entry) { // an updated inode
1227 e = (Entry)inode;
1228 try {
1229 if (e.type == Entry.COPY) {
1230 // entry copy: the only thing changed is the "name"
1231 // and "nlen" in LOC header, so we udpate/rewrite the
1232 // LOC in new file and simply copy the rest (data and
1233 // ext) without enflating/deflating from the old zip
1234 // file LOC entry.
1235 written += copyLOCEntry(e, true, os, written, buf);
1236 } else { // NEW, FILECH or CEN
1237 e.locoff = written;
1238 written += e.writeLOC(os); // write loc header
1239 written += writeEntry(e, os, buf);
1240 }
1241 elist.add(e);
1242 } catch (IOException x) {
1243 x.printStackTrace(); // skip any in-accurate entry
1244 }
1245 } else { // unchanged inode
1246 if (inode.pos == -1) {
1247 continue; // pseudo directory node
1248 }
1249 if (inode.name.length == 1 && inode.name[0] == '/') {
1250 continue; // no root '/' directory even it
1251 // exits in original zip/jar file.
1252 }
1253 e = Entry.readCEN(this, inode);
1254 try {
1255 written += copyLOCEntry(e, false, os, written, buf);
1256 elist.add(e);
1257 } catch (IOException x) {
1258 x.printStackTrace(); // skip any wrong entry
1259 }
1260 }
1261 }
1262
1263 // now write back the cen and end table
1264 end.cenoff = written;
1265 for (Entry entry : elist) {
1266 written += entry.writeCEN(os);
1267 }
1268 end.centot = elist.size();
1269 end.cenlen = written - end.cenoff;
1270 end.write(os, written, forceEnd64);
1271 }
1272
1273 ch.close();
1274 Files.delete(zfpath);
1275 Files.move(tmpFile, zfpath, REPLACE_EXISTING);
1276 hasUpdate = false; // clear
1277 }
1278
1279 IndexNode getInode(byte[] path) {
1280 if (path == null)
1281 throw new NullPointerException("path");
1282 return inodes.get(IndexNode.keyOf(path));
1283 }
1284
1285 Entry getEntry(byte[] path) throws IOException {
1286 IndexNode inode = getInode(path);
1287 if (inode instanceof Entry)
1288 return (Entry)inode;
1289 if (inode == null || inode.pos == -1)
1290 return null;
1291 return Entry.readCEN(this, inode);
1292 }
1293
1294 public void deleteFile(byte[] path, boolean failIfNotExists)
1295 throws IOException
1296 {
1297 checkWritable();
1298
1299 IndexNode inode = getInode(path);
1300 if (inode == null) {
1301 if (path != null && path.length == 0)
1302 throw new ZipException("root directory </> can't not be delete");
1303 if (failIfNotExists)
1304 throw new NoSuchFileException(getString(path));
1305 } else {
1306 if (inode.isDir() && inode.child != null)
1307 throw new DirectoryNotEmptyException(getString(path));
1308 updateDelete(inode);
1309 }
1310 }
1311
1312 // Returns an out stream for either
1313 // (1) writing the contents of a new entry, if the entry exits, or
1314 // (2) updating/replacing the contents of the specified existing entry.
1315 private OutputStream getOutputStream(Entry e) throws IOException {
1316
1317 if (e.mtime == -1)
1318 e.mtime = System.currentTimeMillis();
1319 if (e.method == -1)
1320 e.method = defaultMethod;
1321 // store size, compressed size, and crc-32 in datadescr
1322 e.flag = FLAG_DATADESCR;
1323 if (zc.isUTF8())
1324 e.flag |= FLAG_USE_UTF8;
1325 OutputStream os;
1326 if (useTempFile) {
1327 e.file = getTempPathForEntry(null);
1328 os = Files.newOutputStream(e.file, WRITE);
1329 } else {
1330 os = new ByteArrayOutputStream((e.size > 0)? (int)e.size : 8192);
1331 }
1332 return new EntryOutputStream(e, os);
1333 }
1334
1335 private class EntryOutputStream extends FilterOutputStream {
1336 private Entry e;
1337 private long written;
1338 private boolean isClosed;
1339
1340 EntryOutputStream(Entry e, OutputStream os) throws IOException {
1341 super(os);
1342 this.e = Objects.requireNonNull(e, "Zip entry is null");
1343 // this.written = 0;
1344 }
1345
1346 @Override
1347 public synchronized void write(int b) throws IOException {
1348 out.write(b);
1349 written += 1;
1350 }
1351
1352 @Override
1353 public synchronized void write(byte b[], int off, int len)
1354 throws IOException {
1355 out.write(b, off, len);
1356 written += len;
1357 }
1358
1359 @Override
1360 public synchronized void close() throws IOException {
1361 if (isClosed) {
1362 return;
1363 }
1364 isClosed = true;
1365 e.size = written;
1366 if (out instanceof ByteArrayOutputStream)
1367 e.bytes = ((ByteArrayOutputStream)out).toByteArray();
1368 super.close();
1369 update(e);
1370 }
1371 }
1372
1373 // Wrapper output stream class to write out a "stored" entry.
1374 // (1) this class does not close the underlying out stream when
1375 // being closed.
1376 // (2) no need to be "synchronized", only used by sync()
1377 private class EntryOutputStreamCRC32 extends FilterOutputStream {
1378 private Entry e;
1379 private CRC32 crc;
1380 private long written;
1381 private boolean isClosed;
1382
1383 EntryOutputStreamCRC32(Entry e, OutputStream os) throws IOException {
1384 super(os);
1385 this.e = Objects.requireNonNull(e, "Zip entry is null");
1386 this.crc = new CRC32();
1387 }
1388
1389 @Override
1390 public void write(int b) throws IOException {
1391 out.write(b);
1392 crc.update(b);
1393 written += 1;
1394 }
1395
1396 @Override
1397 public void write(byte b[], int off, int len)
1398 throws IOException {
1399 out.write(b, off, len);
1400 crc.update(b, off, len);
1401 written += len;
1402 }
1403
1404 @Override
1405 public void close() throws IOException {
1406 if (isClosed)
1407 return;
1408 isClosed = true;
1409 e.size = e.csize = written;
1410 e.size = crc.getValue();
1411 }
1412 }
1413
1414 // Wrapper output stream class to write out a "deflated" entry.
1415 // (1) this class does not close the underlying out stream when
1416 // being closed.
1417 // (2) no need to be "synchronized", only used by sync()
1418 private class EntryOutputStreamDef extends DeflaterOutputStream {
1419 private CRC32 crc;
1420 private Entry e;
1421 private boolean isClosed;
1422
1423 EntryOutputStreamDef(Entry e, OutputStream os) throws IOException {
1424 super(os, getDeflater());
1425 this.e = Objects.requireNonNull(e, "Zip entry is null");
1426 this.crc = new CRC32();
1427 }
1428
1429 @Override
1430 public void write(byte b[], int off, int len)
1431 throws IOException {
1432 super.write(b, off, len);
1433 crc.update(b, off, len);
1434 }
1435
1436 @Override
1437 public void close() throws IOException {
1438 if (isClosed)
1439 return;
1440 isClosed = true;
1441 finish();
1442 e.size = def.getBytesRead();
1443 e.csize = def.getBytesWritten();
1444 e.crc = crc.getValue();
1445 }
1446 }
1447
1448 private InputStream getInputStream(Entry e)
1449 throws IOException
1450 {
1451 InputStream eis = null;
1452
1453 if (e.type == Entry.NEW) {
1454 // now bytes & file is uncompressed.
1455 if (e.bytes != null)
1456 return new ByteArrayInputStream(e.bytes);
1457 else if (e.file != null)
1458 return Files.newInputStream(e.file);
1459 else
1460 throw new ZipException("update entry data is missing");
1461 } else if (e.type == Entry.FILECH) {
1462 // FILECH result is un-compressed.
1463 eis = Files.newInputStream(e.file);
1464 // TBD: wrap to hook close()
1465 // streams.add(eis);
1466 return eis;
1467 } else { // untouced CEN or COPY
1468 eis = new EntryInputStream(e, ch);
1469 }
1470 if (e.method == METHOD_DEFLATED) {
1471 // MORE: Compute good size for inflater stream:
1472 long bufSize = e.size + 2; // Inflater likes a bit of slack
1473 if (bufSize > 65536)
1474 bufSize = 8192;
1475 final long size = e.size;
1476 eis = new InflaterInputStream(eis, getInflater(), (int)bufSize) {
1477 private boolean isClosed = false;
1478 public void close() throws IOException {
1479 if (!isClosed) {
1480 releaseInflater(inf);
1481 this.in.close();
1482 isClosed = true;
1483 streams.remove(this);
1484 }
1485 }
1486 // Override fill() method to provide an extra "dummy" byte
1487 // at the end of the input stream. This is required when
1488 // using the "nowrap" Inflater option. (it appears the new
1489 // zlib in 7 does not need it, but keep it for now)
1490 protected void fill() throws IOException {
1491 if (eof) {
1492 throw new EOFException(
1493 "Unexpected end of ZLIB input stream");
1494 }
1495 len = this.in.read(buf, 0, buf.length);
1496 if (len == -1) {
1497 buf[0] = 0;
1498 len = 1;
1499 eof = true;
1500 }
1501 inf.setInput(buf, 0, len);
1502 }
1503 private boolean eof;
1504
1505 public int available() throws IOException {
1506 if (isClosed)
1507 return 0;
1508 long avail = size - inf.getBytesWritten();
1509 return avail > (long) Integer.MAX_VALUE ?
1510 Integer.MAX_VALUE : (int) avail;
1511 }
1512 };
1513 } else if (e.method == METHOD_STORED) {
1514 // TBD: wrap/ it does not seem necessary
1515 } else {
1516 throw new ZipException("invalid compression method");
1517 }
1518 streams.add(eis);
1519 return eis;
1520 }
1521
1522 // Inner class implementing the input stream used to read
1523 // a (possibly compressed) zip file entry.
1524 private class EntryInputStream extends InputStream {
1525 private final SeekableByteChannel zfch; // local ref to zipfs's "ch". zipfs.ch might
1526 // point to a new channel after sync()
1527 private long pos; // current position within entry data
1528 protected long rem; // number of remaining bytes within entry
1529 protected final long size; // uncompressed size of this entry
1530
1531 EntryInputStream(Entry e, SeekableByteChannel zfch)
1532 throws IOException
1533 {
1534 this.zfch = zfch;
1535 rem = e.csize;
1536 size = e.size;
1537 pos = e.locoff;
1538 if (pos == -1) {
1539 Entry e2 = getEntry(e.name);
1540 if (e2 == null) {
1541 throw new ZipException("invalid loc for entry <" + e.name + ">");
1542 }
1543 pos = e2.locoff;
1544 }
1545 pos = -pos; // lazy initialize the real data offset
1546 }
1547
1548 public int read(byte b[], int off, int len) throws IOException {
1549 ensureOpen();
1550 initDataPos();
1551 if (rem == 0) {
1552 return -1;
1553 }
1554 if (len <= 0) {
1555 return 0;
1556 }
1557 if (len > rem) {
1558 len = (int) rem;
1559 }
1560 // readFullyAt()
1561 long n = 0;
1562 ByteBuffer bb = ByteBuffer.wrap(b);
1563 bb.position(off);
1564 bb.limit(off + len);
1565 synchronized(zfch) {
1566 n = zfch.position(pos).read(bb);
1567 }
1568 if (n > 0) {
1569 pos += n;
1570 rem -= n;
1571 }
1572 if (rem == 0) {
1573 close();
1574 }
1575 return (int)n;
1576 }
1577
1578 public int read() throws IOException {
1579 byte[] b = new byte[1];
1580 if (read(b, 0, 1) == 1) {
1581 return b[0] & 0xff;
1582 } else {
1583 return -1;
1584 }
1585 }
1586
1587 public long skip(long n) throws IOException {
1588 ensureOpen();
1589 if (n > rem)
1590 n = rem;
1591 pos += n;
1592 rem -= n;
1593 if (rem == 0) {
1594 close();
1595 }
1596 return n;
1597 }
1598
1599 public int available() {
1600 return rem > Integer.MAX_VALUE ? Integer.MAX_VALUE : (int) rem;
1601 }
1602
1603 public long size() {
1604 return size;
1605 }
1606
1607 public void close() {
1608 rem = 0;
1609 streams.remove(this);
1610 }
1611
1612 private void initDataPos() throws IOException {
1613 if (pos <= 0) {
1614 pos = -pos + locpos;
1615 byte[] buf = new byte[LOCHDR];
1616 if (readFullyAt(buf, 0, buf.length, pos) != LOCHDR) {
1617 throw new ZipException("invalid loc " + pos + " for entry reading");
1618 }
1619 pos += LOCHDR + LOCNAM(buf) + LOCEXT(buf);
1620 }
1621 }
1622 }
1623
1624 static void zerror(String msg) throws ZipException {
1625 throw new ZipException(msg);
1626 }
1627
1628 // Maxmum number of de/inflater we cache
1629 private final int MAX_FLATER = 20;
1630 // List of available Inflater objects for decompression
1631 private final List<Inflater> inflaters = new ArrayList<>();
1632
1633 // Gets an inflater from the list of available inflaters or allocates
1634 // a new one.
1635 private Inflater getInflater() {
1636 synchronized (inflaters) {
1637 int size = inflaters.size();
1638 if (size > 0) {
1639 Inflater inf = inflaters.remove(size - 1);
1640 return inf;
1641 } else {
1642 return new Inflater(true);
1643 }
1644 }
1645 }
1646
1647 // Releases the specified inflater to the list of available inflaters.
1648 private void releaseInflater(Inflater inf) {
1649 synchronized (inflaters) {
1650 if (inflaters.size() < MAX_FLATER) {
1651 inf.reset();
1652 inflaters.add(inf);
1653 } else {
1654 inf.end();
1655 }
1656 }
1657 }
1658
1659 // List of available Deflater objects for compression
1660 private final List<Deflater> deflaters = new ArrayList<>();
1661
1662 // Gets an deflater from the list of available deflaters or allocates
1663 // a new one.
1664 private Deflater getDeflater() {
1665 synchronized (deflaters) {
1666 int size = deflaters.size();
1667 if (size > 0) {
1668 Deflater def = deflaters.remove(size - 1);
1669 return def;
1670 } else {
1671 return new Deflater(Deflater.DEFAULT_COMPRESSION, true);
1672 }
1673 }
1674 }
1675
1676 // Releases the specified inflater to the list of available inflaters.
1677 private void releaseDeflater(Deflater def) {
1678 synchronized (deflaters) {
1679 if (inflaters.size() < MAX_FLATER) {
1680 def.reset();
1681 deflaters.add(def);
1682 } else {
1683 def.end();
1684 }
1685 }
1686 }
1687
1688 // End of central directory record
1689 static class END {
1690 // these 2 fields are not used by anyone and write() uses "0"
1691 // int disknum;
1692 // int sdisknum;
1693 int endsub; // endsub
1694 int centot; // 4 bytes
1695 long cenlen; // 4 bytes
1696 long cenoff; // 4 bytes
1697 int comlen; // comment length
1698 byte[] comment;
1699
1700 /* members of Zip64 end of central directory locator */
1701 // int diskNum;
1702 long endpos;
1703 // int disktot;
1704
1705 void write(OutputStream os, long offset, boolean forceEnd64) throws IOException {
1706 boolean hasZip64 = forceEnd64; // false;
1707 long xlen = cenlen;
1708 long xoff = cenoff;
1709 if (xlen >= ZIP64_MINVAL) {
1710 xlen = ZIP64_MINVAL;
1711 hasZip64 = true;
1712 }
1713 if (xoff >= ZIP64_MINVAL) {
1714 xoff = ZIP64_MINVAL;
1715 hasZip64 = true;
1716 }
1717 int count = centot;
1718 if (count >= ZIP64_MINVAL32) {
1719 count = ZIP64_MINVAL32;
1720 hasZip64 = true;
1721 }
1722 if (hasZip64) {
1723 long off64 = offset;
1724 //zip64 end of central directory record
1725 writeInt(os, ZIP64_ENDSIG); // zip64 END record signature
1726 writeLong(os, ZIP64_ENDHDR - 12); // size of zip64 end
1727 writeShort(os, 45); // version made by
1728 writeShort(os, 45); // version needed to extract
1729 writeInt(os, 0); // number of this disk
1730 writeInt(os, 0); // central directory start disk
1731 writeLong(os, centot); // number of directory entries on disk
1732 writeLong(os, centot); // number of directory entries
1733 writeLong(os, cenlen); // length of central directory
1734 writeLong(os, cenoff); // offset of central directory
1735
1736 //zip64 end of central directory locator
1737 writeInt(os, ZIP64_LOCSIG); // zip64 END locator signature
1738 writeInt(os, 0); // zip64 END start disk
1739 writeLong(os, off64); // offset of zip64 END
1740 writeInt(os, 1); // total number of disks (?)
1741 }
1742 writeInt(os, ENDSIG); // END record signature
1743 writeShort(os, 0); // number of this disk
1744 writeShort(os, 0); // central directory start disk
1745 writeShort(os, count); // number of directory entries on disk
1746 writeShort(os, count); // total number of directory entries
1747 writeInt(os, xlen); // length of central directory
1748 writeInt(os, xoff); // offset of central directory
1749 if (comment != null) { // zip file comment
1750 writeShort(os, comment.length);
1751 writeBytes(os, comment);
1752 } else {
1753 writeShort(os, 0);
1754 }
1755 }
1756 }
1757
1758 // Internal node that links a "name" to its pos in cen table.
1759 // The node itself can be used as a "key" to lookup itself in
1760 // the HashMap inodes.
1761 static class IndexNode {
1762 byte[] name;
1763 int hashcode; // node is hashable/hashed by its name
1764 int pos = -1; // position in cen table, -1 menas the
1765 // entry does not exists in zip file
1766 boolean isdir;
1767
1768 IndexNode(byte[] name, boolean isdir) {
1769 name(name);
1770 this.isdir = isdir;
1771 this.pos = -1;
1772 }
1773
1774 IndexNode(byte[] name, int pos) {
1775 name(name);
1776 this.pos = pos;
1777 }
1778
1779 // constructor for cenInit() (1) remove tailing '/' (2) pad leading '/'
1780 IndexNode(byte[] cen, int pos, int nlen) {
1781 int noff = pos + CENHDR;
1782 if (cen[noff + nlen - 1] == '/') {
1783 isdir = true;
1784 nlen--;
1785 }
1786 if (nlen > 0 && cen[noff] == '/') {
1787 name = Arrays.copyOfRange(cen, noff, noff + nlen);
1788 } else {
1789 name = new byte[nlen + 1];
1790 System.arraycopy(cen, noff, name, 1, nlen);
1791 name[0] = '/';
1792 }
1793 name(name);
1794 this.pos = pos;
1795 }
1796
1797 private static final ThreadLocal<IndexNode> cachedKey = new ThreadLocal<>();
1798
1799 final static IndexNode keyOf(byte[] name) { // get a lookup key;
1800 IndexNode key = cachedKey.get();
1801 if (key == null) {
1802 key = new IndexNode(name, -1);
1803 cachedKey.set(key);
1804 }
1805 return key.as(name);
1806 }
1807
1808 final void name(byte[] name) {
1809 this.name = name;
1810 this.hashcode = Arrays.hashCode(name);
1811 }
1812
1813 final IndexNode as(byte[] name) { // reuse the node, mostly
1814 name(name); // as a lookup "key"
1815 return this;
1816 }
1817
1818 boolean isDir() {
1819 return isdir;
1820 }
1821
1822 public boolean equals(Object other) {
1823 if (!(other instanceof IndexNode)) {
1824 return false;
1825 }
1826 if (other instanceof ParentLookup) {
1827 return ((ParentLookup)other).equals(this);
1828 }
1829 return Arrays.equals(name, ((IndexNode)other).name);
1830 }
1831
1832 public int hashCode() {
1833 return hashcode;
1834 }
1835
1836 IndexNode() {}
1837 IndexNode sibling;
1838 IndexNode child; // 1st child
1839 }
1840
1841 static class Entry extends IndexNode implements ZipFileAttributes {
1842
1843 static final int CEN = 1; // entry read from cen
1844 static final int NEW = 2; // updated contents in bytes or file
1845 static final int FILECH = 3; // fch update in "file"
1846 static final int COPY = 4; // copy of a CEN entry
1847
1848 byte[] bytes; // updated content bytes
1849 Path file; // use tmp file to store bytes;
1850 int type = CEN; // default is the entry read from cen
1851
1852 // entry attributes
1853 int version;
1854 int flag;
1855 int method = -1; // compression method
1856 long mtime = -1; // last modification time (in DOS time)
1857 long atime = -1; // last access time
1858 long ctime = -1; // create time
1859 long crc = -1; // crc-32 of entry data
1860 long csize = -1; // compressed size of entry data
1861 long size = -1; // uncompressed size of entry data
1862 byte[] extra;
1863
1864 // cen
1865
1866 // these fields are not used by anyone and writeCEN uses "0"
1867 // int versionMade;
1868 // int disk;
1869 // int attrs;
1870 // long attrsEx;
1871 long locoff;
1872 byte[] comment;
1873
1874 Entry() {}
1875
1876 Entry(byte[] name, boolean isdir, int method) {
1877 name(name);
1878 this.isdir = isdir;
1879 this.mtime = this.ctime = this.atime = System.currentTimeMillis();
1880 this.crc = 0;
1881 this.size = 0;
1882 this.csize = 0;
1883 this.method = method;
1884 }
1885
1886 Entry(byte[] name, int type, boolean isdir, int method) {
1887 this(name, isdir, method);
1888 this.type = type;
1889 }
1890
1891 Entry (Entry e, int type) {
1892 name(e.name);
1893 this.isdir = e.isdir;
1894 this.version = e.version;
1895 this.ctime = e.ctime;
1896 this.atime = e.atime;
1897 this.mtime = e.mtime;
1898 this.crc = e.crc;
1899 this.size = e.size;
1900 this.csize = e.csize;
1901 this.method = e.method;
1902 this.extra = e.extra;
1903 /*
1904 this.versionMade = e.versionMade;
1905 this.disk = e.disk;
1906 this.attrs = e.attrs;
1907 this.attrsEx = e.attrsEx;
1908 */
1909 this.locoff = e.locoff;
1910 this.comment = e.comment;
1911 this.type = type;
1912 }
1913
1914 Entry (byte[] name, Path file, int type) {
1915 this(name, type, false, METHOD_STORED);
1916 this.file = file;
1917 }
1918
1919 int version() throws ZipException {
1920 if (method == METHOD_DEFLATED)
1921 return 20;
1922 else if (method == METHOD_STORED)
1923 return 10;
1924 throw new ZipException("unsupported compression method");
1925 }
1926
1927 ///////////////////// CEN //////////////////////
1928 static Entry readCEN(ZipFileSystem zipfs, IndexNode inode)
1929 throws IOException
1930 {
1931 return new Entry().cen(zipfs, inode);
1932 }
1933
1934 private Entry cen(ZipFileSystem zipfs, IndexNode inode)
1935 throws IOException
1936 {
1937 byte[] cen = zipfs.cen;
1938 int pos = inode.pos;
1939 if (!cenSigAt(cen, pos))
1940 zerror("invalid CEN header (bad signature)");
1941 version = CENVER(cen, pos);
1942 flag = CENFLG(cen, pos);
1943 method = CENHOW(cen, pos);
1944 mtime = dosToJavaTime(CENTIM(cen, pos));
1945 crc = CENCRC(cen, pos);
1946 csize = CENSIZ(cen, pos);
1947 size = CENLEN(cen, pos);
1948 int nlen = CENNAM(cen, pos);
1949 int elen = CENEXT(cen, pos);
1950 int clen = CENCOM(cen, pos);
1951 /*
1952 versionMade = CENVEM(cen, pos);
1953 disk = CENDSK(cen, pos);
1954 attrs = CENATT(cen, pos);
1955 attrsEx = CENATX(cen, pos);
1956 */
1957 locoff = CENOFF(cen, pos);
1958 pos += CENHDR;
1959 this.name = inode.name;
1960 this.isdir = inode.isdir;
1961 this.hashcode = inode.hashcode;
1962
1963 pos += nlen;
1964 if (elen > 0) {
1965 extra = Arrays.copyOfRange(cen, pos, pos + elen);
1966 pos += elen;
1967 readExtra(zipfs);
1968 }
1969 if (clen > 0) {
1970 comment = Arrays.copyOfRange(cen, pos, pos + clen);
1971 }
1972 return this;
1973 }
1974
1975 int writeCEN(OutputStream os) throws IOException
1976 {
1977 int written = CENHDR;
1978 int version0 = version();
1979 long csize0 = csize;
1980 long size0 = size;
1981 long locoff0 = locoff;
1982 int elen64 = 0; // extra for ZIP64
1983 int elenNTFS = 0; // extra for NTFS (a/c/mtime)
1984 int elenEXTT = 0; // extra for Extended Timestamp
1985 boolean foundExtraTime = false; // if time stamp NTFS, EXTT present
1986
1987 byte[] zname = isdir ? toDirectoryPath(name) : name;
1988
1989 // confirm size/length
1990 int nlen = (zname != null) ? zname.length - 1 : 0; // name has [0] as "slash"
1991 int elen = (extra != null) ? extra.length : 0;
1992 int eoff = 0;
1993 int clen = (comment != null) ? comment.length : 0;
1994 if (csize >= ZIP64_MINVAL) {
1995 csize0 = ZIP64_MINVAL;
1996 elen64 += 8; // csize(8)
1997 }
1998 if (size >= ZIP64_MINVAL) {
1999 size0 = ZIP64_MINVAL; // size(8)
2000 elen64 += 8;
2001 }
2002 if (locoff >= ZIP64_MINVAL) {
2003 locoff0 = ZIP64_MINVAL;
2004 elen64 += 8; // offset(8)
2005 }
2006 if (elen64 != 0) {
2007 elen64 += 4; // header and data sz 4 bytes
2008 }
2009 while (eoff + 4 < elen) {
2010 int tag = SH(extra, eoff);
2011 int sz = SH(extra, eoff + 2);
2012 if (tag == EXTID_EXTT || tag == EXTID_NTFS) {
2013 foundExtraTime = true;
2014 }
2015 eoff += (4 + sz);
2016 }
2017 if (!foundExtraTime) {
2018 if (isWindows) { // use NTFS
2019 elenNTFS = 36; // total 36 bytes
2020 } else { // Extended Timestamp otherwise
2021 elenEXTT = 9; // only mtime in cen
2022 }
2023 }
2024 writeInt(os, CENSIG); // CEN header signature
2025 if (elen64 != 0) {
2026 writeShort(os, 45); // ver 4.5 for zip64
2027 writeShort(os, 45);
2028 } else {
2029 writeShort(os, version0); // version made by
2030 writeShort(os, version0); // version needed to extract
2031 }
2032 writeShort(os, flag); // general purpose bit flag
2033 writeShort(os, method); // compression method
2034 // last modification time
2035 writeInt(os, (int)javaToDosTime(mtime));
2036 writeInt(os, crc); // crc-32
2037 writeInt(os, csize0); // compressed size
2038 writeInt(os, size0); // uncompressed size
2039 writeShort(os, nlen);
2040 writeShort(os, elen + elen64 + elenNTFS + elenEXTT);
2041
2042 if (comment != null) {
2043 writeShort(os, Math.min(clen, 0xffff));
2044 } else {
2045 writeShort(os, 0);
2046 }
2047 writeShort(os, 0); // starting disk number
2048 writeShort(os, 0); // internal file attributes (unused)
2049 writeInt(os, 0); // external file attributes (unused)
2050 writeInt(os, locoff0); // relative offset of local header
2051 writeBytes(os, zname, 1, nlen);
2052 if (elen64 != 0) {
2053 writeShort(os, EXTID_ZIP64);// Zip64 extra
2054 writeShort(os, elen64 - 4); // size of "this" extra block
2055 if (size0 == ZIP64_MINVAL)
2056 writeLong(os, size);
2057 if (csize0 == ZIP64_MINVAL)
2058 writeLong(os, csize);
2059 if (locoff0 == ZIP64_MINVAL)
2060 writeLong(os, locoff);
2061 }
2062 if (elenNTFS != 0) {
2063 writeShort(os, EXTID_NTFS);
2064 writeShort(os, elenNTFS - 4);
2065 writeInt(os, 0); // reserved
2066 writeShort(os, 0x0001); // NTFS attr tag
2067 writeShort(os, 24);
2068 writeLong(os, javaToWinTime(mtime));
2069 writeLong(os, javaToWinTime(atime));
2070 writeLong(os, javaToWinTime(ctime));
2071 }
2072 if (elenEXTT != 0) {
2073 writeShort(os, EXTID_EXTT);
2074 writeShort(os, elenEXTT - 4);
2075 if (ctime == -1)
2076 os.write(0x3); // mtime and atime
2077 else
2078 os.write(0x7); // mtime, atime and ctime
2079 writeInt(os, javaToUnixTime(mtime));
2080 }
2081 if (extra != null) // whatever not recognized
2082 writeBytes(os, extra);
2083 if (comment != null) //TBD: 0, Math.min(commentBytes.length, 0xffff));
2084 writeBytes(os, comment);
2085 return CENHDR + nlen + elen + clen + elen64 + elenNTFS + elenEXTT;
2086 }
2087
2088 ///////////////////// LOC //////////////////////
2089
2090 int writeLOC(OutputStream os) throws IOException {
2091 writeInt(os, LOCSIG); // LOC header signature
2092 int version = version();
2093
2094 byte[] zname = isdir ? toDirectoryPath(name) : name;
2095 int nlen = (zname != null) ? zname.length - 1 : 0; // [0] is slash
2096 int elen = (extra != null) ? extra.length : 0;
2097 boolean foundExtraTime = false; // if extra timestamp present
2098 int eoff = 0;
2099 int elen64 = 0;
2100 int elenEXTT = 0;
2101 int elenNTFS = 0;
2102 if ((flag & FLAG_DATADESCR) != 0) {
2103 writeShort(os, version()); // version needed to extract
2104 writeShort(os, flag); // general purpose bit flag
2105 writeShort(os, method); // compression method
2106 // last modification time
2107 writeInt(os, (int)javaToDosTime(mtime));
2108 // store size, uncompressed size, and crc-32 in data descriptor
2109 // immediately following compressed entry data
2110 writeInt(os, 0);
2111 writeInt(os, 0);
2112 writeInt(os, 0);
2113 } else {
2114 if (csize >= ZIP64_MINVAL || size >= ZIP64_MINVAL) {
2115 elen64 = 20; //headid(2) + size(2) + size(8) + csize(8)
2116 writeShort(os, 45); // ver 4.5 for zip64
2117 } else {
2118 writeShort(os, version()); // version needed to extract
2119 }
2120 writeShort(os, flag); // general purpose bit flag
2121 writeShort(os, method); // compression method
2122 // last modification time
2123 writeInt(os, (int)javaToDosTime(mtime));
2124 writeInt(os, crc); // crc-32
2125 if (elen64 != 0) {
2126 writeInt(os, ZIP64_MINVAL);
2127 writeInt(os, ZIP64_MINVAL);
2128 } else {
2129 writeInt(os, csize); // compressed size
2130 writeInt(os, size); // uncompressed size
2131 }
2132 }
2133 while (eoff + 4 < elen) {
2134 int tag = SH(extra, eoff);
2135 int sz = SH(extra, eoff + 2);
2136 if (tag == EXTID_EXTT || tag == EXTID_NTFS) {
2137 foundExtraTime = true;
2138 }
2139 eoff += (4 + sz);
2140 }
2141 if (!foundExtraTime) {
2142 if (isWindows) {
2143 elenNTFS = 36; // NTFS, total 36 bytes
2144 } else { // on unix use "ext time"
2145 elenEXTT = 9;
2146 if (atime != -1)
2147 elenEXTT += 4;
2148 if (ctime != -1)
2149 elenEXTT += 4;
2150 }
2151 }
2152 writeShort(os, nlen);
2153 writeShort(os, elen + elen64 + elenNTFS + elenEXTT);
2154 writeBytes(os, zname, 1, nlen);
2155 if (elen64 != 0) {
2156 writeShort(os, EXTID_ZIP64);
2157 writeShort(os, 16);
2158 writeLong(os, size);
2159 writeLong(os, csize);
2160 }
2161 if (elenNTFS != 0) {
2162 writeShort(os, EXTID_NTFS);
2163 writeShort(os, elenNTFS - 4);
2164 writeInt(os, 0); // reserved
2165 writeShort(os, 0x0001); // NTFS attr tag
2166 writeShort(os, 24);
2167 writeLong(os, javaToWinTime(mtime));
2168 writeLong(os, javaToWinTime(atime));
2169 writeLong(os, javaToWinTime(ctime));
2170 }
2171 if (elenEXTT != 0) {
2172 writeShort(os, EXTID_EXTT);
2173 writeShort(os, elenEXTT - 4);// size for the folowing data block
2174 int fbyte = 0x1;
2175 if (atime != -1) // mtime and atime
2176 fbyte |= 0x2;
2177 if (ctime != -1) // mtime, atime and ctime
2178 fbyte |= 0x4;
2179 os.write(fbyte); // flags byte
2180 writeInt(os, javaToUnixTime(mtime));
2181 if (atime != -1)
2182 writeInt(os, javaToUnixTime(atime));
2183 if (ctime != -1)
2184 writeInt(os, javaToUnixTime(ctime));
2185 }
2186 if (extra != null) {
2187 writeBytes(os, extra);
2188 }
2189 return LOCHDR + nlen + elen + elen64 + elenNTFS + elenEXTT;
2190 }
2191
2192 // Data Descriptior
2193 int writeEXT(OutputStream os) throws IOException {
2194 writeInt(os, EXTSIG); // EXT header signature
2195 writeInt(os, crc); // crc-32
2196 if (csize >= ZIP64_MINVAL || size >= ZIP64_MINVAL) {
2197 writeLong(os, csize);
2198 writeLong(os, size);
2199 return 24;
2200 } else {
2201 writeInt(os, csize); // compressed size
2202 writeInt(os, size); // uncompressed size
2203 return 16;
2204 }
2205 }
2206
2207 // read NTFS, UNIX and ZIP64 data from cen.extra
2208 void readExtra(ZipFileSystem zipfs) throws IOException {
2209 if (extra == null)
2210 return;
2211 int elen = extra.length;
2212 int off = 0;
2213 int newOff = 0;
2214 while (off + 4 < elen) {
2215 // extra spec: HeaderID+DataSize+Data
2216 int pos = off;
2217 int tag = SH(extra, pos);
2218 int sz = SH(extra, pos + 2);
2219 pos += 4;
2220 if (pos + sz > elen) // invalid data
2221 break;
2222 switch (tag) {
2223 case EXTID_ZIP64 :
2224 if (size == ZIP64_MINVAL) {
2225 if (pos + 8 > elen) // invalid zip64 extra
2226 break; // fields, just skip
2227 size = LL(extra, pos);
2228 pos += 8;
2229 }
2230 if (csize == ZIP64_MINVAL) {
2231 if (pos + 8 > elen)
2232 break;
2233 csize = LL(extra, pos);
2234 pos += 8;
2235 }
2236 if (locoff == ZIP64_MINVAL) {
2237 if (pos + 8 > elen)
2238 break;
2239 locoff = LL(extra, pos);
2240 pos += 8;
2241 }
2242 break;
2243 case EXTID_NTFS:
2244 if (sz < 32)
2245 break;
2246 pos += 4; // reserved 4 bytes
2247 if (SH(extra, pos) != 0x0001)
2248 break;
2249 if (SH(extra, pos + 2) != 24)
2250 break;
2251 // override the loc field, datatime here is
2252 // more "accurate"
2253 mtime = winToJavaTime(LL(extra, pos + 4));
2254 atime = winToJavaTime(LL(extra, pos + 12));
2255 ctime = winToJavaTime(LL(extra, pos + 20));
2256 break;
2257 case EXTID_EXTT:
2258 // spec says the Extened timestamp in cen only has mtime
2259 // need to read the loc to get the extra a/ctime, if flag
2260 // "zipinfo-time" is not specified to false;
2261 // there is performance cost (move up to loc and read) to
2262 // access the loc table foreach entry;
2263 if (zipfs.noExtt) {
2264 if (sz == 5)
2265 mtime = unixToJavaTime(LG(extra, pos + 1));
2266 break;
2267 }
2268 byte[] buf = new byte[LOCHDR];
2269 if (zipfs.readFullyAt(buf, 0, buf.length , locoff)
2270 != buf.length)
2271 throw new ZipException("loc: reading failed");
2272 if (!locSigAt(buf, 0))
2273 throw new ZipException("loc: wrong sig ->"
2274 + Long.toString(getSig(buf, 0), 16));
2275 int locElen = LOCEXT(buf);
2276 if (locElen < 9) // EXTT is at lease 9 bytes
2277 break;
2278 int locNlen = LOCNAM(buf);
2279 buf = new byte[locElen];
2280 if (zipfs.readFullyAt(buf, 0, buf.length , locoff + LOCHDR + locNlen)
2281 != buf.length)
2282 throw new ZipException("loc extra: reading failed");
2283 int locPos = 0;
2284 while (locPos + 4 < buf.length) {
2285 int locTag = SH(buf, locPos);
2286 int locSZ = SH(buf, locPos + 2);
2287 locPos += 4;
2288 if (locTag != EXTID_EXTT) {
2289 locPos += locSZ;
2290 continue;
2291 }
2292 int end = locPos + locSZ - 4;
2293 int flag = CH(buf, locPos++);
2294 if ((flag & 0x1) != 0 && locPos <= end) {
2295 mtime = unixToJavaTime(LG(buf, locPos));
2296 locPos += 4;
2297 }
2298 if ((flag & 0x2) != 0 && locPos <= end) {
2299 atime = unixToJavaTime(LG(buf, locPos));
2300 locPos += 4;
2301 }
2302 if ((flag & 0x4) != 0 && locPos <= end) {
2303 ctime = unixToJavaTime(LG(buf, locPos));
2304 locPos += 4;
2305 }
2306 break;
2307 }
2308 break;
2309 default: // unknown tag
2310 System.arraycopy(extra, off, extra, newOff, sz + 4);
2311 newOff += (sz + 4);
2312 }
2313 off += (sz + 4);
2314 }
2315 if (newOff != 0 && newOff != extra.length)
2316 extra = Arrays.copyOf(extra, newOff);
2317 else
2318 extra = null;
2319 }
2320
2321 ///////// basic file attributes ///////////
2322 @Override
2323 public FileTime creationTime() {
2324 return FileTime.fromMillis(ctime == -1 ? mtime : ctime);
2325 }
2326
2327 @Override
2328 public boolean isDirectory() {
2329 return isDir();
2330 }
2331
2332 @Override
2333 public boolean isOther() {
2334 return false;
2335 }
2336
2337 @Override
2338 public boolean isRegularFile() {
2339 return !isDir();
2340 }
2341
2342 @Override
2343 public FileTime lastAccessTime() {
2344 return FileTime.fromMillis(atime == -1 ? mtime : atime);
2345 }
2346
2347 @Override
2348 public FileTime lastModifiedTime() {
2349 return FileTime.fromMillis(mtime);
2350 }
2351
2352 @Override
2353 public long size() {
2354 return size;
2355 }
2356
2357 @Override
2358 public boolean isSymbolicLink() {
2359 return false;
2360 }
2361
2362 @Override
2363 public Object fileKey() {
2364 return null;
2365 }
2366
2367 ///////// zip entry attributes ///////////
2368 public long compressedSize() {
2369 return csize;
2370 }
2371
2372 public long crc() {
2373 return crc;
2374 }
2375
2376 public int method() {
2377 return method;
2378 }
2379
2380 public byte[] extra() {
2381 if (extra != null)
2382 return Arrays.copyOf(extra, extra.length);
2383 return null;
2384 }
2385
2386 public byte[] comment() {
2387 if (comment != null)
2388 return Arrays.copyOf(comment, comment.length);
2389 return null;
2390 }
2391
2392 public String toString() {
2393 StringBuilder sb = new StringBuilder(1024);
2394 Formatter fm = new Formatter(sb);
2395 fm.format(" name : %s%n", new String(name));
2396 fm.format(" creationTime : %tc%n", creationTime().toMillis());
2397 fm.format(" lastAccessTime : %tc%n", lastAccessTime().toMillis());
2398 fm.format(" lastModifiedTime: %tc%n", lastModifiedTime().toMillis());
2399 fm.format(" isRegularFile : %b%n", isRegularFile());
2400 fm.format(" isDirectory : %b%n", isDirectory());
2401 fm.format(" isSymbolicLink : %b%n", isSymbolicLink());
2402 fm.format(" isOther : %b%n", isOther());
2403 fm.format(" fileKey : %s%n", fileKey());
2404 fm.format(" size : %d%n", size());
2405 fm.format(" compressedSize : %d%n", compressedSize());
2406 fm.format(" crc : %x%n", crc());
2407 fm.format(" method : %d%n", method());
2408 fm.close();
2409 return sb.toString();
2410 }
2411 }
2412
2413 // ZIP directory has two issues:
2414 // (1) ZIP spec does not require the ZIP file to include
2415 // directory entry
2416 // (2) all entries are not stored/organized in a "tree"
2417 // structure.
2418 // A possible solution is to build the node tree ourself as
2419 // implemented below.
2420 private IndexNode root;
2421
2422 // default time stamp for pseudo entries
2423 private long zfsDefaultTimeStamp = System.currentTimeMillis();
2424
2425 private void removeFromTree(IndexNode inode) {
2426 IndexNode parent = inodes.get(LOOKUPKEY.as(getParent(inode.name)));
2427 IndexNode child = parent.child;
2428 if (child.equals(inode)) {
2429 parent.child = child.sibling;
2430 } else {
2431 IndexNode last = child;
2432 while ((child = child.sibling) != null) {
2433 if (child.equals(inode)) {
2434 last.sibling = child.sibling;
2435 break;
2436 } else {
2437 last = child;
2438 }
2439 }
2440 }
2441 }
2442
2443 // purely for parent lookup, so we don't have to copy the parent
2444 // name every time
2445 static class ParentLookup extends IndexNode {
2446 int len;
2447 ParentLookup() {}
2448
2449 final ParentLookup as(byte[] name, int len) { // as a lookup "key"
2450 name(name, len);
2451 return this;
2452 }
2453
2454 void name(byte[] name, int len) {
2455 this.name = name;
2456 this.len = len;
2457 // calculate the hashcode the same way as Arrays.hashCode() does
2458 int result = 1;
2459 for (int i = 0; i < len; i++)
2460 result = 31 * result + name[i];
2461 this.hashcode = result;
2462 }
2463
2464 @Override
2465 public boolean equals(Object other) {
2466 if (!(other instanceof IndexNode)) {
2467 return false;
2468 }
2469 byte[] oname = ((IndexNode)other).name;
2470 return Arrays.equals(name, 0, len,
2471 oname, 0, oname.length);
2472 }
2473
2474 }
2475
2476 private void buildNodeTree() throws IOException {
2477 beginWrite();
2478 try {
2479 IndexNode root = inodes.get(LOOKUPKEY.as(ROOTPATH));
2480 if (root == null) {
2481 root = new IndexNode(ROOTPATH, true);
2482 } else {
2483 inodes.remove(root);
2484 }
2485 IndexNode[] nodes = inodes.keySet().toArray(new IndexNode[0]);
2486 inodes.put(root, root);
2487 ParentLookup lookup = new ParentLookup();
2488 for (IndexNode node : nodes) {
2489 IndexNode parent;
2490 while (true) {
2491 int off = getParentOff(node.name);
2492 if (off <= 1) { // parent is root
2493 node.sibling = root.child;
2494 root.child = node;
2495 break;
2496 }
2497 lookup = lookup.as(node.name, off);
2498 if (inodes.containsKey(lookup)) {
2499 parent = inodes.get(lookup);
2500 node.sibling = parent.child;
2501 parent.child = node;
2502 break;
2503 }
2504 // add new pseudo directory entry
2505 parent = new IndexNode(Arrays.copyOf(node.name, off), true);
2506 inodes.put(parent, parent);
2507 node.sibling = parent.child;
2508 parent.child = node;
2509 node = parent;
2510 }
2511 }
2512 } finally {
2513 endWrite();
2514 }
2515 }
2516 }