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 + CENHDR, 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 if (readFullyAt(buf, 0, LOCHDR , locoff) != LOCHDR)
1151 throw new ZipException("loc: reading failed");
1152 if (updateHeader) {
1153 locoff += LOCHDR + LOCNAM(buf) + LOCEXT(buf); // skip header
1154 size += e.csize;
1155 written = e.writeLOC(os) + size;
1156 } else {
1157 os.write(buf, 0, LOCHDR); // write out the loc header
1158 locoff += LOCHDR;
1159 // use e.csize, LOCSIZ(buf) is zero if FLAG_DATADESCR is on
1160 // size += LOCNAM(buf) + LOCEXT(buf) + LOCSIZ(buf);
1161 size += LOCNAM(buf) + LOCEXT(buf) + e.csize;
1162 written = LOCHDR + size;
1163 }
1164 int n;
1165 while (size > 0 &&
1166 (n = (int)readFullyAt(buf, 0, buf.length, locoff)) != -1)
1167 {
1168 if (size < n)
1169 n = (int)size;
1170 os.write(buf, 0, n);
1171 size -= n;
1172 locoff += n;
1173 }
1174 return written;
1175 }
1176
1177 private long writeEntry(Entry e, OutputStream os, byte[] buf)
1178 throws IOException {
1179
1180 if (e.bytes == null && e.file == null) // dir, 0-length data
1181 return 0;
1182
1183 long written = 0;
1184 try (OutputStream os2 = e.method == METHOD_STORED ?
1185 new EntryOutputStreamCRC32(e, os) : new EntryOutputStreamDef(e, os)) {
1186 if (e.bytes != null) { // in-memory
1187 os2.write(e.bytes, 0, e.bytes.length);
1188 } else if (e.file != null) { // tmp file
1189 if (e.type == Entry.NEW || e.type == Entry.FILECH) {
1190 try (InputStream is = Files.newInputStream(e.file)) {
1191 is.transferTo(os2);
1192 }
1193 }
1194 Files.delete(e.file);
1195 tmppaths.remove(e.file);
1196 }
1197 }
1198 written += e.csize;
1199 if ((e.flag & FLAG_DATADESCR) != 0) {
1200 written += e.writeEXT(os);
1201 }
1202 return written;
1203 }
1204
1205 // sync the zip file system, if there is any udpate
1206 private void sync() throws IOException {
1207
1208 if (!hasUpdate)
1209 return;
1210 Path tmpFile = createTempFileInSameDirectoryAs(zfpath);
1211 try (OutputStream os = new BufferedOutputStream(Files.newOutputStream(tmpFile, WRITE)))
1212 {
1213 ArrayList<Entry> elist = new ArrayList<>(inodes.size());
1214 long written = 0;
1215 byte[] buf = new byte[8192];
1216 Entry e = null;
1217
1218 // write loc
1219 for (IndexNode inode : inodes.values()) {
1220 if (inode instanceof Entry) { // an updated inode
1221 e = (Entry)inode;
1222 try {
1223 if (e.type == Entry.COPY) {
1224 // entry copy: the only thing changed is the "name"
1225 // and "nlen" in LOC header, so we udpate/rewrite the
1226 // LOC in new file and simply copy the rest (data and
1227 // ext) without enflating/deflating from the old zip
1228 // file LOC entry.
1229 written += copyLOCEntry(e, true, os, written, buf);
1230 } else { // NEW, FILECH or CEN
1231 e.locoff = written;
1232 written += e.writeLOC(os); // write loc header
1233 written += writeEntry(e, os, buf);
1234 }
1235 elist.add(e);
1236 } catch (IOException x) {
1237 x.printStackTrace(); // skip any in-accurate entry
1238 }
1239 } else { // unchanged inode
1240 if (inode.pos == -1) {
1241 continue; // pseudo directory node
1242 }
1243 e = Entry.readCEN(this, inode);
1244 try {
1245 written += copyLOCEntry(e, false, os, written, buf);
1246 elist.add(e);
1247 } catch (IOException x) {
1248 x.printStackTrace(); // skip any wrong entry
1249 }
1250 }
1251 }
1252
1253 // now write back the cen and end table
1254 end.cenoff = written;
1255 for (Entry entry : elist) {
1256 written += entry.writeCEN(os);
1257 }
1258 end.centot = elist.size();
1259 end.cenlen = written - end.cenoff;
1260 end.write(os, written, forceEnd64);
1261 }
1262
1263 ch.close();
1264 Files.delete(zfpath);
1265 Files.move(tmpFile, zfpath, REPLACE_EXISTING);
1266 hasUpdate = false; // clear
1267 }
1268
1269 IndexNode getInode(byte[] path) {
1270 if (path == null)
1271 throw new NullPointerException("path");
1272 return inodes.get(IndexNode.keyOf(path));
1273 }
1274
1275 Entry getEntry(byte[] path) throws IOException {
1276 IndexNode inode = getInode(path);
1277 if (inode instanceof Entry)
1278 return (Entry)inode;
1279 if (inode == null || inode.pos == -1)
1280 return null;
1281 return Entry.readCEN(this, inode);
1282 }
1283
1284 public void deleteFile(byte[] path, boolean failIfNotExists)
1285 throws IOException
1286 {
1287 checkWritable();
1288
1289 IndexNode inode = getInode(path);
1290 if (inode == null) {
1291 if (path != null && path.length == 0)
1292 throw new ZipException("root directory </> can't not be delete");
1293 if (failIfNotExists)
1294 throw new NoSuchFileException(getString(path));
1295 } else {
1296 if (inode.isDir() && inode.child != null)
1297 throw new DirectoryNotEmptyException(getString(path));
1298 updateDelete(inode);
1299 }
1300 }
1301
1302 // Returns an out stream for either
1303 // (1) writing the contents of a new entry, if the entry exits, or
1304 // (2) updating/replacing the contents of the specified existing entry.
1305 private OutputStream getOutputStream(Entry e) throws IOException {
1306
1307 if (e.mtime == -1)
1308 e.mtime = System.currentTimeMillis();
1309 if (e.method == -1)
1310 e.method = defaultMethod;
1311 // store size, compressed size, and crc-32 in datadescr
1312 e.flag = FLAG_DATADESCR;
1313 if (zc.isUTF8())
1314 e.flag |= FLAG_USE_UTF8;
1315 OutputStream os;
1316 if (useTempFile) {
1317 e.file = getTempPathForEntry(null);
1318 os = Files.newOutputStream(e.file, WRITE);
1319 } else {
1320 os = new ByteArrayOutputStream((e.size > 0)? (int)e.size : 8192);
1321 }
1322 return new EntryOutputStream(e, os);
1323 }
1324
1325 private class EntryOutputStream extends FilterOutputStream {
1326 private Entry e;
1327 private long written;
1328 private boolean isClosed;
1329
1330 EntryOutputStream(Entry e, OutputStream os) throws IOException {
1331 super(os);
1332 this.e = Objects.requireNonNull(e, "Zip entry is null");
1333 // this.written = 0;
1334 }
1335
1336 @Override
1337 public synchronized void write(int b) throws IOException {
1338 out.write(b);
1339 written += 1;
1340 }
1341
1342 @Override
1343 public synchronized void write(byte b[], int off, int len)
1344 throws IOException {
1345 out.write(b, off, len);
1346 written += len;
1347 }
1348
1349 @Override
1350 public synchronized void close() throws IOException {
1351 if (isClosed) {
1352 return;
1353 }
1354 isClosed = true;
1355 e.size = written;
1356 if (out instanceof ByteArrayOutputStream)
1357 e.bytes = ((ByteArrayOutputStream)out).toByteArray();
1358 super.close();
1359 update(e);
1360 }
1361 }
1362
1363 // Wrapper output stream class to write out a "stored" entry.
1364 // (1) this class does not close the underlying out stream when
1365 // being closed.
1366 // (2) no need to be "synchronized", only used by sync()
1367 private class EntryOutputStreamCRC32 extends FilterOutputStream {
1368 private Entry e;
1369 private CRC32 crc;
1370 private long written;
1371 private boolean isClosed;
1372
1373 EntryOutputStreamCRC32(Entry e, OutputStream os) throws IOException {
1374 super(os);
1375 this.e = Objects.requireNonNull(e, "Zip entry is null");
1376 this.crc = new CRC32();
1377 }
1378
1379 @Override
1380 public void write(int b) throws IOException {
1381 out.write(b);
1382 crc.update(b);
1383 written += 1;
1384 }
1385
1386 @Override
1387 public void write(byte b[], int off, int len)
1388 throws IOException {
1389 out.write(b, off, len);
1390 crc.update(b, off, len);
1391 written += len;
1392 }
1393
1394 @Override
1395 public void close() throws IOException {
1396 if (isClosed)
1397 return;
1398 isClosed = true;
1399 e.size = e.csize = written;
1400 e.size = crc.getValue();
1401 }
1402 }
1403
1404 // Wrapper output stream class to write out a "deflated" entry.
1405 // (1) this class does not close the underlying out stream when
1406 // being closed.
1407 // (2) no need to be "synchronized", only used by sync()
1408 private class EntryOutputStreamDef extends DeflaterOutputStream {
1409 private CRC32 crc;
1410 private Entry e;
1411 private boolean isClosed;
1412
1413 EntryOutputStreamDef(Entry e, OutputStream os) throws IOException {
1414 super(os, getDeflater());
1415 this.e = Objects.requireNonNull(e, "Zip entry is null");
1416 this.crc = new CRC32();
1417 }
1418
1419 @Override
1420 public void write(byte b[], int off, int len)
1421 throws IOException {
1422 super.write(b, off, len);
1423 crc.update(b, off, len);
1424 }
1425
1426 @Override
1427 public void close() throws IOException {
1428 if (isClosed)
1429 return;
1430 isClosed = true;
1431 finish();
1432 e.size = def.getBytesRead();
1433 e.csize = def.getBytesWritten();
1434 e.crc = crc.getValue();
1435 }
1436 }
1437
1438 private InputStream getInputStream(Entry e)
1439 throws IOException
1440 {
1441 InputStream eis = null;
1442
1443 if (e.type == Entry.NEW) {
1444 // now bytes & file is uncompressed.
1445 if (e.bytes != null)
1446 return new ByteArrayInputStream(e.bytes);
1447 else if (e.file != null)
1448 return Files.newInputStream(e.file);
1449 else
1450 throw new ZipException("update entry data is missing");
1451 } else if (e.type == Entry.FILECH) {
1452 // FILECH result is un-compressed.
1453 eis = Files.newInputStream(e.file);
1454 // TBD: wrap to hook close()
1455 // streams.add(eis);
1456 return eis;
1457 } else { // untouced CEN or COPY
1458 eis = new EntryInputStream(e, ch);
1459 }
1460 if (e.method == METHOD_DEFLATED) {
1461 // MORE: Compute good size for inflater stream:
1462 long bufSize = e.size + 2; // Inflater likes a bit of slack
1463 if (bufSize > 65536)
1464 bufSize = 8192;
1465 final long size = e.size;
1466 eis = new InflaterInputStream(eis, getInflater(), (int)bufSize) {
1467 private boolean isClosed = false;
1468 public void close() throws IOException {
1469 if (!isClosed) {
1470 releaseInflater(inf);
1471 this.in.close();
1472 isClosed = true;
1473 streams.remove(this);
1474 }
1475 }
1476 // Override fill() method to provide an extra "dummy" byte
1477 // at the end of the input stream. This is required when
1478 // using the "nowrap" Inflater option. (it appears the new
1479 // zlib in 7 does not need it, but keep it for now)
1480 protected void fill() throws IOException {
1481 if (eof) {
1482 throw new EOFException(
1483 "Unexpected end of ZLIB input stream");
1484 }
1485 len = this.in.read(buf, 0, buf.length);
1486 if (len == -1) {
1487 buf[0] = 0;
1488 len = 1;
1489 eof = true;
1490 }
1491 inf.setInput(buf, 0, len);
1492 }
1493 private boolean eof;
1494
1495 public int available() throws IOException {
1496 if (isClosed)
1497 return 0;
1498 long avail = size - inf.getBytesWritten();
1499 return avail > (long) Integer.MAX_VALUE ?
1500 Integer.MAX_VALUE : (int) avail;
1501 }
1502 };
1503 } else if (e.method == METHOD_STORED) {
1504 // TBD: wrap/ it does not seem necessary
1505 } else {
1506 throw new ZipException("invalid compression method");
1507 }
1508 streams.add(eis);
1509 return eis;
1510 }
1511
1512 // Inner class implementing the input stream used to read
1513 // a (possibly compressed) zip file entry.
1514 private class EntryInputStream extends InputStream {
1515 private final SeekableByteChannel zfch; // local ref to zipfs's "ch". zipfs.ch might
1516 // point to a new channel after sync()
1517 private long pos; // current position within entry data
1518 protected long rem; // number of remaining bytes within entry
1519 protected final long size; // uncompressed size of this entry
1520
1521 EntryInputStream(Entry e, SeekableByteChannel zfch)
1522 throws IOException
1523 {
1524 this.zfch = zfch;
1525 rem = e.csize;
1526 size = e.size;
1527 pos = e.locoff;
1528 if (pos == -1) {
1529 Entry e2 = getEntry(e.name);
1530 if (e2 == null) {
1531 throw new ZipException("invalid loc for entry <" + e.name + ">");
1532 }
1533 pos = e2.locoff;
1534 }
1535 pos = -pos; // lazy initialize the real data offset
1536 }
1537
1538 public int read(byte b[], int off, int len) throws IOException {
1539 ensureOpen();
1540 initDataPos();
1541 if (rem == 0) {
1542 return -1;
1543 }
1544 if (len <= 0) {
1545 return 0;
1546 }
1547 if (len > rem) {
1548 len = (int) rem;
1549 }
1550 // readFullyAt()
1551 long n = 0;
1552 ByteBuffer bb = ByteBuffer.wrap(b);
1553 bb.position(off);
1554 bb.limit(off + len);
1555 synchronized(zfch) {
1556 n = zfch.position(pos).read(bb);
1557 }
1558 if (n > 0) {
1559 pos += n;
1560 rem -= n;
1561 }
1562 if (rem == 0) {
1563 close();
1564 }
1565 return (int)n;
1566 }
1567
1568 public int read() throws IOException {
1569 byte[] b = new byte[1];
1570 if (read(b, 0, 1) == 1) {
1571 return b[0] & 0xff;
1572 } else {
1573 return -1;
1574 }
1575 }
1576
1577 public long skip(long n) throws IOException {
1578 ensureOpen();
1579 if (n > rem)
1580 n = rem;
1581 pos += n;
1582 rem -= n;
1583 if (rem == 0) {
1584 close();
1585 }
1586 return n;
1587 }
1588
1589 public int available() {
1590 return rem > Integer.MAX_VALUE ? Integer.MAX_VALUE : (int) rem;
1591 }
1592
1593 public long size() {
1594 return size;
1595 }
1596
1597 public void close() {
1598 rem = 0;
1599 streams.remove(this);
1600 }
1601
1602 private void initDataPos() throws IOException {
1603 if (pos <= 0) {
1604 pos = -pos + locpos;
1605 byte[] buf = new byte[LOCHDR];
1606 if (readFullyAt(buf, 0, buf.length, pos) != LOCHDR) {
1607 throw new ZipException("invalid loc " + pos + " for entry reading");
1608 }
1609 pos += LOCHDR + LOCNAM(buf) + LOCEXT(buf);
1610 }
1611 }
1612 }
1613
1614 static void zerror(String msg) throws ZipException {
1615 throw new ZipException(msg);
1616 }
1617
1618 // Maxmum number of de/inflater we cache
1619 private final int MAX_FLATER = 20;
1620 // List of available Inflater objects for decompression
1621 private final List<Inflater> inflaters = new ArrayList<>();
1622
1623 // Gets an inflater from the list of available inflaters or allocates
1624 // a new one.
1625 private Inflater getInflater() {
1626 synchronized (inflaters) {
1627 int size = inflaters.size();
1628 if (size > 0) {
1629 Inflater inf = inflaters.remove(size - 1);
1630 return inf;
1631 } else {
1632 return new Inflater(true);
1633 }
1634 }
1635 }
1636
1637 // Releases the specified inflater to the list of available inflaters.
1638 private void releaseInflater(Inflater inf) {
1639 synchronized (inflaters) {
1640 if (inflaters.size() < MAX_FLATER) {
1641 inf.reset();
1642 inflaters.add(inf);
1643 } else {
1644 inf.end();
1645 }
1646 }
1647 }
1648
1649 // List of available Deflater objects for compression
1650 private final List<Deflater> deflaters = new ArrayList<>();
1651
1652 // Gets an deflater from the list of available deflaters or allocates
1653 // a new one.
1654 private Deflater getDeflater() {
1655 synchronized (deflaters) {
1656 int size = deflaters.size();
1657 if (size > 0) {
1658 Deflater def = deflaters.remove(size - 1);
1659 return def;
1660 } else {
1661 return new Deflater(Deflater.DEFAULT_COMPRESSION, true);
1662 }
1663 }
1664 }
1665
1666 // Releases the specified inflater to the list of available inflaters.
1667 private void releaseDeflater(Deflater def) {
1668 synchronized (deflaters) {
1669 if (inflaters.size() < MAX_FLATER) {
1670 def.reset();
1671 deflaters.add(def);
1672 } else {
1673 def.end();
1674 }
1675 }
1676 }
1677
1678 // End of central directory record
1679 static class END {
1680 // these 2 fields are not used by anyone and write() uses "0"
1681 // int disknum;
1682 // int sdisknum;
1683 int endsub; // endsub
1684 int centot; // 4 bytes
1685 long cenlen; // 4 bytes
1686 long cenoff; // 4 bytes
1687 int comlen; // comment length
1688 byte[] comment;
1689
1690 /* members of Zip64 end of central directory locator */
1691 // int diskNum;
1692 long endpos;
1693 // int disktot;
1694
1695 void write(OutputStream os, long offset, boolean forceEnd64) throws IOException {
1696 boolean hasZip64 = forceEnd64; // false;
1697 long xlen = cenlen;
1698 long xoff = cenoff;
1699 if (xlen >= ZIP64_MINVAL) {
1700 xlen = ZIP64_MINVAL;
1701 hasZip64 = true;
1702 }
1703 if (xoff >= ZIP64_MINVAL) {
1704 xoff = ZIP64_MINVAL;
1705 hasZip64 = true;
1706 }
1707 int count = centot;
1708 if (count >= ZIP64_MINVAL32) {
1709 count = ZIP64_MINVAL32;
1710 hasZip64 = true;
1711 }
1712 if (hasZip64) {
1713 long off64 = offset;
1714 //zip64 end of central directory record
1715 writeInt(os, ZIP64_ENDSIG); // zip64 END record signature
1716 writeLong(os, ZIP64_ENDHDR - 12); // size of zip64 end
1717 writeShort(os, 45); // version made by
1718 writeShort(os, 45); // version needed to extract
1719 writeInt(os, 0); // number of this disk
1720 writeInt(os, 0); // central directory start disk
1721 writeLong(os, centot); // number of directory entries on disk
1722 writeLong(os, centot); // number of directory entries
1723 writeLong(os, cenlen); // length of central directory
1724 writeLong(os, cenoff); // offset of central directory
1725
1726 //zip64 end of central directory locator
1727 writeInt(os, ZIP64_LOCSIG); // zip64 END locator signature
1728 writeInt(os, 0); // zip64 END start disk
1729 writeLong(os, off64); // offset of zip64 END
1730 writeInt(os, 1); // total number of disks (?)
1731 }
1732 writeInt(os, ENDSIG); // END record signature
1733 writeShort(os, 0); // number of this disk
1734 writeShort(os, 0); // central directory start disk
1735 writeShort(os, count); // number of directory entries on disk
1736 writeShort(os, count); // total number of directory entries
1737 writeInt(os, xlen); // length of central directory
1738 writeInt(os, xoff); // offset of central directory
1739 if (comment != null) { // zip file comment
1740 writeShort(os, comment.length);
1741 writeBytes(os, comment);
1742 } else {
1743 writeShort(os, 0);
1744 }
1745 }
1746 }
1747
1748 // Internal node that links a "name" to its pos in cen table.
1749 // The node itself can be used as a "key" to lookup itself in
1750 // the HashMap inodes.
1751 static class IndexNode {
1752 byte[] name;
1753 int hashcode; // node is hashable/hashed by its name
1754 int pos = -1; // position in cen table, -1 menas the
1755 // entry does not exists in zip file
1756 boolean isdir;
1757
1758 IndexNode(byte[] name, boolean isdir) {
1759 name(name);
1760 this.isdir = isdir;
1761 this.pos = -1;
1762 }
1763
1764 IndexNode(byte[] name, int pos) {
1765 name(name);
1766 this.pos = pos;
1767 }
1768
1769 // constructor for cenInit()
1770 IndexNode(byte[] cen, int noff, int pos, int nlen) {
1771 if (cen[noff + nlen - 1] == '/') {
1772 isdir = true;
1773 nlen--;
1774 }
1775 name = new byte[nlen + 1];
1776 System.arraycopy(cen, pos + CENHDR, name, 1, nlen);
1777 name[0] = '/';
1778 name(name);
1779 this.pos = pos;
1780 }
1781
1782 private static final ThreadLocal<IndexNode> cachedKey = new ThreadLocal<>();
1783
1784 final static IndexNode keyOf(byte[] name) { // get a lookup key;
1785 IndexNode key = cachedKey.get();
1786 if (key == null) {
1787 key = new IndexNode(name, -1);
1788 cachedKey.set(key);
1789 }
1790 return key.as(name);
1791 }
1792
1793 final void name(byte[] name) {
1794 this.name = name;
1795 this.hashcode = Arrays.hashCode(name);
1796 }
1797
1798 final IndexNode as(byte[] name) { // reuse the node, mostly
1799 name(name); // as a lookup "key"
1800 return this;
1801 }
1802
1803 boolean isDir() {
1804 return isdir;
1805 }
1806
1807 public boolean equals(Object other) {
1808 if (!(other instanceof IndexNode)) {
1809 return false;
1810 }
1811 if (other instanceof ParentLookup) {
1812 return ((ParentLookup)other).equals(this);
1813 }
1814 return Arrays.equals(name, ((IndexNode)other).name);
1815 }
1816
1817 public int hashCode() {
1818 return hashcode;
1819 }
1820
1821 IndexNode() {}
1822 IndexNode sibling;
1823 IndexNode child; // 1st child
1824 }
1825
1826 static class Entry extends IndexNode implements ZipFileAttributes {
1827
1828 static final int CEN = 1; // entry read from cen
1829 static final int NEW = 2; // updated contents in bytes or file
1830 static final int FILECH = 3; // fch update in "file"
1831 static final int COPY = 4; // copy of a CEN entry
1832
1833 byte[] bytes; // updated content bytes
1834 Path file; // use tmp file to store bytes;
1835 int type = CEN; // default is the entry read from cen
1836
1837 // entry attributes
1838 int version;
1839 int flag;
1840 int method = -1; // compression method
1841 long mtime = -1; // last modification time (in DOS time)
1842 long atime = -1; // last access time
1843 long ctime = -1; // create time
1844 long crc = -1; // crc-32 of entry data
1845 long csize = -1; // compressed size of entry data
1846 long size = -1; // uncompressed size of entry data
1847 byte[] extra;
1848
1849 // cen
1850
1851 // these fields are not used by anyone and writeCEN uses "0"
1852 // int versionMade;
1853 // int disk;
1854 // int attrs;
1855 // long attrsEx;
1856 long locoff;
1857 byte[] comment;
1858
1859 Entry() {}
1860
1861 Entry(byte[] name, boolean isdir, int method) {
1862 name(name);
1863 this.isdir = isdir;
1864 this.mtime = this.ctime = this.atime = System.currentTimeMillis();
1865 this.crc = 0;
1866 this.size = 0;
1867 this.csize = 0;
1868 this.method = method;
1869 }
1870
1871 Entry(byte[] name, int type, boolean isdir, int method) {
1872 this(name, isdir, method);
1873 this.type = type;
1874 }
1875
1876 Entry (Entry e, int type) {
1877 name(e.name);
1878 this.isdir = e.isdir;
1879 this.version = e.version;
1880 this.ctime = e.ctime;
1881 this.atime = e.atime;
1882 this.mtime = e.mtime;
1883 this.crc = e.crc;
1884 this.size = e.size;
1885 this.csize = e.csize;
1886 this.method = e.method;
1887 this.extra = e.extra;
1888 /*
1889 this.versionMade = e.versionMade;
1890 this.disk = e.disk;
1891 this.attrs = e.attrs;
1892 this.attrsEx = e.attrsEx;
1893 */
1894 this.locoff = e.locoff;
1895 this.comment = e.comment;
1896 this.type = type;
1897 }
1898
1899 Entry (byte[] name, Path file, int type) {
1900 this(name, type, false, METHOD_STORED);
1901 this.file = file;
1902 }
1903
1904 int version() throws ZipException {
1905 if (method == METHOD_DEFLATED)
1906 return 20;
1907 else if (method == METHOD_STORED)
1908 return 10;
1909 throw new ZipException("unsupported compression method");
1910 }
1911
1912 ///////////////////// CEN //////////////////////
1913 static Entry readCEN(ZipFileSystem zipfs, IndexNode inode)
1914 throws IOException
1915 {
1916 return new Entry().cen(zipfs, inode);
1917 }
1918
1919 private Entry cen(ZipFileSystem zipfs, IndexNode inode)
1920 throws IOException
1921 {
1922 byte[] cen = zipfs.cen;
1923 int pos = inode.pos;
1924 if (!cenSigAt(cen, pos))
1925 zerror("invalid CEN header (bad signature)");
1926 version = CENVER(cen, pos);
1927 flag = CENFLG(cen, pos);
1928 method = CENHOW(cen, pos);
1929 mtime = dosToJavaTime(CENTIM(cen, pos));
1930 crc = CENCRC(cen, pos);
1931 csize = CENSIZ(cen, pos);
1932 size = CENLEN(cen, pos);
1933 int nlen = CENNAM(cen, pos);
1934 int elen = CENEXT(cen, pos);
1935 int clen = CENCOM(cen, pos);
1936 /*
1937 versionMade = CENVEM(cen, pos);
1938 disk = CENDSK(cen, pos);
1939 attrs = CENATT(cen, pos);
1940 attrsEx = CENATX(cen, pos);
1941 */
1942 locoff = CENOFF(cen, pos);
1943 pos += CENHDR;
1944 this.name = inode.name;
1945 this.isdir = inode.isdir;
1946 this.hashcode = inode.hashcode;
1947
1948 pos += nlen;
1949 if (elen > 0) {
1950 extra = Arrays.copyOfRange(cen, pos, pos + elen);
1951 pos += elen;
1952 readExtra(zipfs);
1953 }
1954 if (clen > 0) {
1955 comment = Arrays.copyOfRange(cen, pos, pos + clen);
1956 }
1957 return this;
1958 }
1959
1960 int writeCEN(OutputStream os) throws IOException
1961 {
1962 int written = CENHDR;
1963 int version0 = version();
1964 long csize0 = csize;
1965 long size0 = size;
1966 long locoff0 = locoff;
1967 int elen64 = 0; // extra for ZIP64
1968 int elenNTFS = 0; // extra for NTFS (a/c/mtime)
1969 int elenEXTT = 0; // extra for Extended Timestamp
1970 boolean foundExtraTime = false; // if time stamp NTFS, EXTT present
1971
1972 byte[] zname = isdir ? toDirectoryPath(name) : name;
1973
1974 // confirm size/length
1975 int nlen = (zname != null) ? zname.length - 1 : 0; // name has [0] as "slash"
1976 int elen = (extra != null) ? extra.length : 0;
1977 int eoff = 0;
1978 int clen = (comment != null) ? comment.length : 0;
1979 if (csize >= ZIP64_MINVAL) {
1980 csize0 = ZIP64_MINVAL;
1981 elen64 += 8; // csize(8)
1982 }
1983 if (size >= ZIP64_MINVAL) {
1984 size0 = ZIP64_MINVAL; // size(8)
1985 elen64 += 8;
1986 }
1987 if (locoff >= ZIP64_MINVAL) {
1988 locoff0 = ZIP64_MINVAL;
1989 elen64 += 8; // offset(8)
1990 }
1991 if (elen64 != 0) {
1992 elen64 += 4; // header and data sz 4 bytes
1993 }
1994 while (eoff + 4 < elen) {
1995 int tag = SH(extra, eoff);
1996 int sz = SH(extra, eoff + 2);
1997 if (tag == EXTID_EXTT || tag == EXTID_NTFS) {
1998 foundExtraTime = true;
1999 }
2000 eoff += (4 + sz);
2001 }
2002 if (!foundExtraTime) {
2003 if (isWindows) { // use NTFS
2004 elenNTFS = 36; // total 36 bytes
2005 } else { // Extended Timestamp otherwise
2006 elenEXTT = 9; // only mtime in cen
2007 }
2008 }
2009 writeInt(os, CENSIG); // CEN header signature
2010 if (elen64 != 0) {
2011 writeShort(os, 45); // ver 4.5 for zip64
2012 writeShort(os, 45);
2013 } else {
2014 writeShort(os, version0); // version made by
2015 writeShort(os, version0); // version needed to extract
2016 }
2017 writeShort(os, flag); // general purpose bit flag
2018 writeShort(os, method); // compression method
2019 // last modification time
2020 writeInt(os, (int)javaToDosTime(mtime));
2021 writeInt(os, crc); // crc-32
2022 writeInt(os, csize0); // compressed size
2023 writeInt(os, size0); // uncompressed size
2024 writeShort(os, nlen);
2025 writeShort(os, elen + elen64 + elenNTFS + elenEXTT);
2026
2027 if (comment != null) {
2028 writeShort(os, Math.min(clen, 0xffff));
2029 } else {
2030 writeShort(os, 0);
2031 }
2032 writeShort(os, 0); // starting disk number
2033 writeShort(os, 0); // internal file attributes (unused)
2034 writeInt(os, 0); // external file attributes (unused)
2035 writeInt(os, locoff0); // relative offset of local header
2036 writeBytes(os, zname, 1, nlen);
2037 if (elen64 != 0) {
2038 writeShort(os, EXTID_ZIP64);// Zip64 extra
2039 writeShort(os, elen64 - 4); // size of "this" extra block
2040 if (size0 == ZIP64_MINVAL)
2041 writeLong(os, size);
2042 if (csize0 == ZIP64_MINVAL)
2043 writeLong(os, csize);
2044 if (locoff0 == ZIP64_MINVAL)
2045 writeLong(os, locoff);
2046 }
2047 if (elenNTFS != 0) {
2048 writeShort(os, EXTID_NTFS);
2049 writeShort(os, elenNTFS - 4);
2050 writeInt(os, 0); // reserved
2051 writeShort(os, 0x0001); // NTFS attr tag
2052 writeShort(os, 24);
2053 writeLong(os, javaToWinTime(mtime));
2054 writeLong(os, javaToWinTime(atime));
2055 writeLong(os, javaToWinTime(ctime));
2056 }
2057 if (elenEXTT != 0) {
2058 writeShort(os, EXTID_EXTT);
2059 writeShort(os, elenEXTT - 4);
2060 if (ctime == -1)
2061 os.write(0x3); // mtime and atime
2062 else
2063 os.write(0x7); // mtime, atime and ctime
2064 writeInt(os, javaToUnixTime(mtime));
2065 }
2066 if (extra != null) // whatever not recognized
2067 writeBytes(os, extra);
2068 if (comment != null) //TBD: 0, Math.min(commentBytes.length, 0xffff));
2069 writeBytes(os, comment);
2070 return CENHDR + nlen + elen + clen + elen64 + elenNTFS + elenEXTT;
2071 }
2072
2073 ///////////////////// LOC //////////////////////
2074
2075 int writeLOC(OutputStream os) throws IOException {
2076 writeInt(os, LOCSIG); // LOC header signature
2077 int version = version();
2078
2079 byte[] zname = isdir ? toDirectoryPath(name) : name;
2080 int nlen = (zname != null) ? zname.length - 1 : 0; // [0] is slash
2081 int elen = (extra != null) ? extra.length : 0;
2082 boolean foundExtraTime = false; // if extra timestamp present
2083 int eoff = 0;
2084 int elen64 = 0;
2085 int elenEXTT = 0;
2086 int elenNTFS = 0;
2087 if ((flag & FLAG_DATADESCR) != 0) {
2088 writeShort(os, version()); // version needed to extract
2089 writeShort(os, flag); // general purpose bit flag
2090 writeShort(os, method); // compression method
2091 // last modification time
2092 writeInt(os, (int)javaToDosTime(mtime));
2093 // store size, uncompressed size, and crc-32 in data descriptor
2094 // immediately following compressed entry data
2095 writeInt(os, 0);
2096 writeInt(os, 0);
2097 writeInt(os, 0);
2098 } else {
2099 if (csize >= ZIP64_MINVAL || size >= ZIP64_MINVAL) {
2100 elen64 = 20; //headid(2) + size(2) + size(8) + csize(8)
2101 writeShort(os, 45); // ver 4.5 for zip64
2102 } else {
2103 writeShort(os, version()); // version needed to extract
2104 }
2105 writeShort(os, flag); // general purpose bit flag
2106 writeShort(os, method); // compression method
2107 // last modification time
2108 writeInt(os, (int)javaToDosTime(mtime));
2109 writeInt(os, crc); // crc-32
2110 if (elen64 != 0) {
2111 writeInt(os, ZIP64_MINVAL);
2112 writeInt(os, ZIP64_MINVAL);
2113 } else {
2114 writeInt(os, csize); // compressed size
2115 writeInt(os, size); // uncompressed size
2116 }
2117 }
2118 while (eoff + 4 < elen) {
2119 int tag = SH(extra, eoff);
2120 int sz = SH(extra, eoff + 2);
2121 if (tag == EXTID_EXTT || tag == EXTID_NTFS) {
2122 foundExtraTime = true;
2123 }
2124 eoff += (4 + sz);
2125 }
2126 if (!foundExtraTime) {
2127 if (isWindows) {
2128 elenNTFS = 36; // NTFS, total 36 bytes
2129 } else { // on unix use "ext time"
2130 elenEXTT = 9;
2131 if (atime != -1)
2132 elenEXTT += 4;
2133 if (ctime != -1)
2134 elenEXTT += 4;
2135 }
2136 }
2137 writeShort(os, nlen);
2138 writeShort(os, elen + elen64 + elenNTFS + elenEXTT);
2139 writeBytes(os, zname, 1, nlen);
2140 if (elen64 != 0) {
2141 writeShort(os, EXTID_ZIP64);
2142 writeShort(os, 16);
2143 writeLong(os, size);
2144 writeLong(os, csize);
2145 }
2146 if (elenNTFS != 0) {
2147 writeShort(os, EXTID_NTFS);
2148 writeShort(os, elenNTFS - 4);
2149 writeInt(os, 0); // reserved
2150 writeShort(os, 0x0001); // NTFS attr tag
2151 writeShort(os, 24);
2152 writeLong(os, javaToWinTime(mtime));
2153 writeLong(os, javaToWinTime(atime));
2154 writeLong(os, javaToWinTime(ctime));
2155 }
2156 if (elenEXTT != 0) {
2157 writeShort(os, EXTID_EXTT);
2158 writeShort(os, elenEXTT - 4);// size for the folowing data block
2159 int fbyte = 0x1;
2160 if (atime != -1) // mtime and atime
2161 fbyte |= 0x2;
2162 if (ctime != -1) // mtime, atime and ctime
2163 fbyte |= 0x4;
2164 os.write(fbyte); // flags byte
2165 writeInt(os, javaToUnixTime(mtime));
2166 if (atime != -1)
2167 writeInt(os, javaToUnixTime(atime));
2168 if (ctime != -1)
2169 writeInt(os, javaToUnixTime(ctime));
2170 }
2171 if (extra != null) {
2172 writeBytes(os, extra);
2173 }
2174 return LOCHDR + nlen + elen + elen64 + elenNTFS + elenEXTT;
2175 }
2176
2177 // Data Descriptior
2178 int writeEXT(OutputStream os) throws IOException {
2179 writeInt(os, EXTSIG); // EXT header signature
2180 writeInt(os, crc); // crc-32
2181 if (csize >= ZIP64_MINVAL || size >= ZIP64_MINVAL) {
2182 writeLong(os, csize);
2183 writeLong(os, size);
2184 return 24;
2185 } else {
2186 writeInt(os, csize); // compressed size
2187 writeInt(os, size); // uncompressed size
2188 return 16;
2189 }
2190 }
2191
2192 // read NTFS, UNIX and ZIP64 data from cen.extra
2193 void readExtra(ZipFileSystem zipfs) throws IOException {
2194 if (extra == null)
2195 return;
2196 int elen = extra.length;
2197 int off = 0;
2198 int newOff = 0;
2199 while (off + 4 < elen) {
2200 // extra spec: HeaderID+DataSize+Data
2201 int pos = off;
2202 int tag = SH(extra, pos);
2203 int sz = SH(extra, pos + 2);
2204 pos += 4;
2205 if (pos + sz > elen) // invalid data
2206 break;
2207 switch (tag) {
2208 case EXTID_ZIP64 :
2209 if (size == ZIP64_MINVAL) {
2210 if (pos + 8 > elen) // invalid zip64 extra
2211 break; // fields, just skip
2212 size = LL(extra, pos);
2213 pos += 8;
2214 }
2215 if (csize == ZIP64_MINVAL) {
2216 if (pos + 8 > elen)
2217 break;
2218 csize = LL(extra, pos);
2219 pos += 8;
2220 }
2221 if (locoff == ZIP64_MINVAL) {
2222 if (pos + 8 > elen)
2223 break;
2224 locoff = LL(extra, pos);
2225 pos += 8;
2226 }
2227 break;
2228 case EXTID_NTFS:
2229 if (sz < 32)
2230 break;
2231 pos += 4; // reserved 4 bytes
2232 if (SH(extra, pos) != 0x0001)
2233 break;
2234 if (SH(extra, pos + 2) != 24)
2235 break;
2236 // override the loc field, datatime here is
2237 // more "accurate"
2238 mtime = winToJavaTime(LL(extra, pos + 4));
2239 atime = winToJavaTime(LL(extra, pos + 12));
2240 ctime = winToJavaTime(LL(extra, pos + 20));
2241 break;
2242 case EXTID_EXTT:
2243 // spec says the Extened timestamp in cen only has mtime
2244 // need to read the loc to get the extra a/ctime, if flag
2245 // "zipinfo-time" is not specified to false;
2246 // there is performance cost (move up to loc and read) to
2247 // access the loc table foreach entry;
2248 if (zipfs.noExtt) {
2249 if (sz == 5)
2250 mtime = unixToJavaTime(LG(extra, pos + 1));
2251 break;
2252 }
2253 byte[] buf = new byte[LOCHDR];
2254 if (zipfs.readFullyAt(buf, 0, buf.length , locoff)
2255 != buf.length)
2256 throw new ZipException("loc: reading failed");
2257 if (!locSigAt(buf, 0))
2258 throw new ZipException("loc: wrong sig ->"
2259 + Long.toString(getSig(buf, 0), 16));
2260 int locElen = LOCEXT(buf);
2261 if (locElen < 9) // EXTT is at lease 9 bytes
2262 break;
2263 int locNlen = LOCNAM(buf);
2264 buf = new byte[locElen];
2265 if (zipfs.readFullyAt(buf, 0, buf.length , locoff + LOCHDR + locNlen)
2266 != buf.length)
2267 throw new ZipException("loc extra: reading failed");
2268 int locPos = 0;
2269 while (locPos + 4 < buf.length) {
2270 int locTag = SH(buf, locPos);
2271 int locSZ = SH(buf, locPos + 2);
2272 locPos += 4;
2273 if (locTag != EXTID_EXTT) {
2274 locPos += locSZ;
2275 continue;
2276 }
2277 int end = locPos + locSZ - 4;
2278 int flag = CH(buf, locPos++);
2279 if ((flag & 0x1) != 0 && locPos <= end) {
2280 mtime = unixToJavaTime(LG(buf, locPos));
2281 locPos += 4;
2282 }
2283 if ((flag & 0x2) != 0 && locPos <= end) {
2284 atime = unixToJavaTime(LG(buf, locPos));
2285 locPos += 4;
2286 }
2287 if ((flag & 0x4) != 0 && locPos <= end) {
2288 ctime = unixToJavaTime(LG(buf, locPos));
2289 locPos += 4;
2290 }
2291 break;
2292 }
2293 break;
2294 default: // unknown tag
2295 System.arraycopy(extra, off, extra, newOff, sz + 4);
2296 newOff += (sz + 4);
2297 }
2298 off += (sz + 4);
2299 }
2300 if (newOff != 0 && newOff != extra.length)
2301 extra = Arrays.copyOf(extra, newOff);
2302 else
2303 extra = null;
2304 }
2305
2306 ///////// basic file attributes ///////////
2307 @Override
2308 public FileTime creationTime() {
2309 return FileTime.fromMillis(ctime == -1 ? mtime : ctime);
2310 }
2311
2312 @Override
2313 public boolean isDirectory() {
2314 return isDir();
2315 }
2316
2317 @Override
2318 public boolean isOther() {
2319 return false;
2320 }
2321
2322 @Override
2323 public boolean isRegularFile() {
2324 return !isDir();
2325 }
2326
2327 @Override
2328 public FileTime lastAccessTime() {
2329 return FileTime.fromMillis(atime == -1 ? mtime : atime);
2330 }
2331
2332 @Override
2333 public FileTime lastModifiedTime() {
2334 return FileTime.fromMillis(mtime);
2335 }
2336
2337 @Override
2338 public long size() {
2339 return size;
2340 }
2341
2342 @Override
2343 public boolean isSymbolicLink() {
2344 return false;
2345 }
2346
2347 @Override
2348 public Object fileKey() {
2349 return null;
2350 }
2351
2352 ///////// zip entry attributes ///////////
2353 public long compressedSize() {
2354 return csize;
2355 }
2356
2357 public long crc() {
2358 return crc;
2359 }
2360
2361 public int method() {
2362 return method;
2363 }
2364
2365 public byte[] extra() {
2366 if (extra != null)
2367 return Arrays.copyOf(extra, extra.length);
2368 return null;
2369 }
2370
2371 public byte[] comment() {
2372 if (comment != null)
2373 return Arrays.copyOf(comment, comment.length);
2374 return null;
2375 }
2376
2377 public String toString() {
2378 StringBuilder sb = new StringBuilder(1024);
2379 Formatter fm = new Formatter(sb);
2380 fm.format(" name : %s%n", new String(name));
2381 fm.format(" creationTime : %tc%n", creationTime().toMillis());
2382 fm.format(" lastAccessTime : %tc%n", lastAccessTime().toMillis());
2383 fm.format(" lastModifiedTime: %tc%n", lastModifiedTime().toMillis());
2384 fm.format(" isRegularFile : %b%n", isRegularFile());
2385 fm.format(" isDirectory : %b%n", isDirectory());
2386 fm.format(" isSymbolicLink : %b%n", isSymbolicLink());
2387 fm.format(" isOther : %b%n", isOther());
2388 fm.format(" fileKey : %s%n", fileKey());
2389 fm.format(" size : %d%n", size());
2390 fm.format(" compressedSize : %d%n", compressedSize());
2391 fm.format(" crc : %x%n", crc());
2392 fm.format(" method : %d%n", method());
2393 fm.close();
2394 return sb.toString();
2395 }
2396 }
2397
2398 // ZIP directory has two issues:
2399 // (1) ZIP spec does not require the ZIP file to include
2400 // directory entry
2401 // (2) all entries are not stored/organized in a "tree"
2402 // structure.
2403 // A possible solution is to build the node tree ourself as
2404 // implemented below.
2405 private IndexNode root;
2406
2407 // default time stamp for pseudo entries
2408 private long zfsDefaultTimeStamp = System.currentTimeMillis();
2409
2410 private void removeFromTree(IndexNode inode) {
2411 IndexNode parent = inodes.get(LOOKUPKEY.as(getParent(inode.name)));
2412 IndexNode child = parent.child;
2413 if (child.equals(inode)) {
2414 parent.child = child.sibling;
2415 } else {
2416 IndexNode last = child;
2417 while ((child = child.sibling) != null) {
2418 if (child.equals(inode)) {
2419 last.sibling = child.sibling;
2420 break;
2421 } else {
2422 last = child;
2423 }
2424 }
2425 }
2426 }
2427
2428 // purely for parent lookup, so we don't have to copy the parent
2429 // name every time
2430 static class ParentLookup extends IndexNode {
2431 int len;
2432 ParentLookup() {}
2433
2434 final ParentLookup as(byte[] name, int len) { // as a lookup "key"
2435 name(name, len);
2436 return this;
2437 }
2438
2439 void name(byte[] name, int len) {
2440 this.name = name;
2441 this.len = len;
2442 // calculate the hashcode the same way as Arrays.hashCode() does
2443 int result = 1;
2444 for (int i = 0; i < len; i++)
2445 result = 31 * result + name[i];
2446 this.hashcode = result;
2447 }
2448
2449 @Override
2450 public boolean equals(Object other) {
2451 if (!(other instanceof IndexNode)) {
2452 return false;
2453 }
2454 byte[] oname = ((IndexNode)other).name;
2455 return Arrays.equals(name, 0, len,
2456 oname, 0, oname.length);
2457 }
2458
2459 }
2460
2461 private void buildNodeTree() throws IOException {
2462 beginWrite();
2463 try {
2464 IndexNode root = new IndexNode(ROOTPATH, true);
2465 IndexNode[] nodes = inodes.keySet().toArray(new IndexNode[0]);
2466 inodes.put(root, root);
2467 ParentLookup lookup = new ParentLookup();
2468 for (IndexNode node : nodes) {
2469 IndexNode parent;
2470 while (true) {
2471 int off = getParentOff(node.name);
2472 if (off <= 1) { // parent is root
2473 node.sibling = root.child;
2474 root.child = node;
2475 break;
2476 }
2477 lookup = lookup.as(node.name, off);
2478 if (inodes.containsKey(lookup)) {
2479 parent = inodes.get(lookup);
2480 node.sibling = parent.child;
2481 parent.child = node;
2482 break;
2483 }
2484 // add new pseudo directory entry
2485 parent = new IndexNode(Arrays.copyOf(node.name, off), true);
2486 inodes.put(parent, parent);
2487 node.sibling = parent.child;
2488 parent.child = node;
2489 node = parent;
2490 }
2491 }
2492 } finally {
2493 endWrite();
2494 }
2495 }
2496 }