1 /*
2 * Copyright (c) 2009, 2013, Oracle and/or its affiliates. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 * - Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 *
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * - Neither the name of Oracle nor the names of its
16 * contributors may be used to endorse or promote products derived
17 * from this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
20 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
21 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
24 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
26 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
27 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
28 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
29 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 /*
33 * This source code is provided to illustrate the usage of a given feature
34 * or technique and has been deliberately simplified. Additional steps
35 * required for a production-quality application, such as security checks,
36 * input validation and proper error handling, might not be present in
37 * this sample code.
38 */
39
40
41 package com.sun.nio.zipfs;
42
43 import java.io.BufferedOutputStream;
44 import java.io.ByteArrayInputStream;
45 import java.io.ByteArrayOutputStream;
46 import java.io.EOFException;
47 import java.io.File;
48 import java.io.IOException;
49 import java.io.InputStream;
50 import java.io.OutputStream;
51 import java.nio.ByteBuffer;
52 import java.nio.MappedByteBuffer;
53 import java.nio.channels.*;
54 import java.nio.file.*;
55 import java.nio.file.attribute.*;
56 import java.nio.file.spi.*;
57 import java.util.*;
58 import java.util.concurrent.locks.ReadWriteLock;
59 import java.util.concurrent.locks.ReentrantReadWriteLock;
60 import java.util.regex.Pattern;
61 import java.util.zip.CRC32;
62 import java.util.zip.Inflater;
63 import java.util.zip.Deflater;
64 import java.util.zip.InflaterInputStream;
65 import java.util.zip.DeflaterOutputStream;
66 import java.util.zip.ZipException;
67 import java.util.zip.ZipError;
68 import static java.lang.Boolean.*;
69 import static com.sun.nio.zipfs.ZipConstants.*;
70 import static com.sun.nio.zipfs.ZipUtils.*;
71 import static java.nio.file.StandardOpenOption.*;
72 import static java.nio.file.StandardCopyOption.*;
73
74 /**
75 * A FileSystem built on a zip file
76 *
77 * @author Xueming Shen
78 */
79
80 public class ZipFileSystem extends FileSystem {
81
82 private final ZipFileSystemProvider provider;
83 private final ZipPath defaultdir;
84 private boolean readOnly = false;
85 private final Path zfpath;
86 private final ZipCoder zc;
87
88 // configurable by env map
89 private final String defaultDir; // default dir for the file system
90 private final String nameEncoding; // default encoding for name/comment
91 private final boolean useTempFile; // use a temp file for newOS, default
92 // is to use BAOS for better performance
93 private final boolean createNew; // create a new zip if not exists
94 private static final boolean isWindows =
95 System.getProperty("os.name").startsWith("Windows");
96
97 ZipFileSystem(ZipFileSystemProvider provider,
98 Path zfpath,
99 Map<String, ?> env)
100 throws IOException
101 {
102 // configurable env setup
103 this.createNew = "true".equals(env.get("create"));
104 this.nameEncoding = env.containsKey("encoding") ?
105 (String)env.get("encoding") : "UTF-8";
106 this.useTempFile = TRUE.equals(env.get("useTempFile"));
107 this.defaultDir = env.containsKey("default.dir") ?
108 (String)env.get("default.dir") : "/";
109 if (this.defaultDir.charAt(0) != '/')
110 throw new IllegalArgumentException("default dir should be absolute");
111
112 this.provider = provider;
113 this.zfpath = zfpath;
114 if (Files.notExists(zfpath)) {
115 if (createNew) {
116 try (OutputStream os = Files.newOutputStream(zfpath, CREATE_NEW, WRITE)) {
117 new END().write(os, 0);
118 }
119 } else {
120 throw new FileSystemNotFoundException(zfpath.toString());
121 }
122 }
123 // sm and existence check
124 zfpath.getFileSystem().provider().checkAccess(zfpath, AccessMode.READ);
125 if (!Files.isWritable(zfpath))
126 this.readOnly = true;
127 this.zc = ZipCoder.get(nameEncoding);
128 this.defaultdir = new ZipPath(this, getBytes(defaultDir));
129 this.ch = Files.newByteChannel(zfpath, READ);
130 this.cen = initCEN();
131 }
132
133 @Override
134 public FileSystemProvider provider() {
135 return provider;
136 }
137
138 @Override
139 public String getSeparator() {
140 return "/";
141 }
142
143 @Override
144 public boolean isOpen() {
145 return isOpen;
146 }
147
148 @Override
149 public boolean isReadOnly() {
150 return readOnly;
151 }
152
153 private void checkWritable() throws IOException {
154 if (readOnly)
155 throw new ReadOnlyFileSystemException();
156 }
157
158 @Override
159 public Iterable<Path> getRootDirectories() {
160 ArrayList<Path> pathArr = new ArrayList<>();
161 pathArr.add(new ZipPath(this, new byte[]{'/'}));
162 return pathArr;
163 }
164
165 ZipPath getDefaultDir() { // package private
166 return defaultdir;
167 }
168
169 @Override
170 public ZipPath getPath(String first, String... more) {
171 String path;
172 if (more.length == 0) {
173 path = first;
174 } else {
175 StringBuilder sb = new StringBuilder();
176 sb.append(first);
177 for (String segment: more) {
178 if (segment.length() > 0) {
179 if (sb.length() > 0)
180 sb.append('/');
181 sb.append(segment);
182 }
183 }
184 path = sb.toString();
185 }
186 return new ZipPath(this, getBytes(path));
187 }
188
189 @Override
190 public UserPrincipalLookupService getUserPrincipalLookupService() {
191 throw new UnsupportedOperationException();
192 }
193
194 @Override
195 public WatchService newWatchService() {
196 throw new UnsupportedOperationException();
197 }
198
199 FileStore getFileStore(ZipPath path) {
200 return new ZipFileStore(path);
201 }
202
203 @Override
204 public Iterable<FileStore> getFileStores() {
205 ArrayList<FileStore> list = new ArrayList<>(1);
206 list.add(new ZipFileStore(new ZipPath(this, new byte[]{'/'})));
207 return list;
208 }
209
210 private static final Set<String> supportedFileAttributeViews =
211 Collections.unmodifiableSet(
212 new HashSet<String>(Arrays.asList("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.equals(GLOB_SYNTAX)) {
241 expr = toRegexPattern(input);
242 } else {
243 if (syntax.equals(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 sync();
278 ch.close(); // close the ch just in case no update
279 } finally { // and sync dose not close the ch
280 endWrite();
281 }
282
283 synchronized (inflaters) {
284 for (Inflater inf : inflaters)
285 inf.end();
286 }
287 synchronized (deflaters) {
288 for (Deflater def : deflaters)
289 def.end();
290 }
291
292 IOException ioe = null;
293 synchronized (tmppaths) {
294 for (Path p: tmppaths) {
295 try {
296 Files.deleteIfExists(p);
297 } catch (IOException x) {
298 if (ioe == null)
299 ioe = x;
300 else
301 ioe.addSuppressed(x);
302 }
303 }
304 }
305 provider.removeFileSystem(zfpath, this);
306 if (ioe != null)
307 throw ioe;
308 }
309
310 ZipFileAttributes getFileAttributes(byte[] path)
311 throws IOException
312 {
313 Entry e;
314 beginRead();
315 try {
316 ensureOpen();
317 e = getEntry0(path);
318 if (e == null) {
319 IndexNode inode = getInode(path);
320 if (inode == null)
321 return null;
322 e = new Entry(inode.name); // pseudo directory
323 e.method = METHOD_STORED; // STORED for dir
324 e.mtime = e.atime = e.ctime = -1;// -1 for all times
325 }
326 } finally {
327 endRead();
328 }
329 return new ZipFileAttributes(e);
330 }
331
332 void setTimes(byte[] path, FileTime mtime, FileTime atime, FileTime ctime)
333 throws IOException
334 {
335 checkWritable();
336 beginWrite();
337 try {
338 ensureOpen();
339 Entry e = getEntry0(path); // ensureOpen checked
340 if (e == null)
341 throw new NoSuchFileException(getString(path));
342 if (e.type == Entry.CEN)
343 e.type = Entry.COPY; // copy e
344 if (mtime != null)
345 e.mtime = mtime.toMillis();
346 if (atime != null)
347 e.atime = atime.toMillis();
348 if (ctime != null)
349 e.ctime = ctime.toMillis();
350 update(e);
351 } finally {
352 endWrite();
353 }
354 }
355
356 boolean exists(byte[] path)
357 throws IOException
358 {
359 beginRead();
360 try {
361 ensureOpen();
362 return getInode(path) != null;
363 } finally {
364 endRead();
365 }
366 }
367
368 boolean isDirectory(byte[] path)
369 throws IOException
370 {
371 beginRead();
372 try {
373 IndexNode n = getInode(path);
374 return n != null && n.isDir();
375 } finally {
376 endRead();
377 }
378 }
379
380 private ZipPath toZipPath(byte[] path) {
381 // make it absolute
382 byte[] p = new byte[path.length + 1];
383 p[0] = '/';
384 System.arraycopy(path, 0, p, 1, path.length);
385 return new ZipPath(this, p);
386 }
387
388 // returns the list of child paths of "path"
389 Iterator<Path> iteratorOf(byte[] path,
390 DirectoryStream.Filter<? super Path> filter)
391 throws IOException
392 {
393 beginWrite(); // iteration of inodes needs exclusive lock
394 try {
395 ensureOpen();
396 IndexNode inode = getInode(path);
397 if (inode == null)
398 throw new NotDirectoryException(getString(path));
399 List<Path> list = new ArrayList<>();
400 IndexNode child = inode.child;
401 while (child != null) {
402 ZipPath zp = toZipPath(child.name);
403 if (filter == null || filter.accept(zp))
404 list.add(zp);
405 child = child.sibling;
406 }
407 return list.iterator();
408 } finally {
409 endWrite();
410 }
411 }
412
413 void createDirectory(byte[] dir, FileAttribute<?>... attrs)
414 throws IOException
415 {
416 checkWritable();
417 dir = toDirectoryPath(dir);
418 beginWrite();
419 try {
420 ensureOpen();
421 if (dir.length == 0 || exists(dir)) // root dir, or exiting dir
422 throw new FileAlreadyExistsException(getString(dir));
423 checkParents(dir);
424 Entry e = new Entry(dir, Entry.NEW);
425 e.method = METHOD_STORED; // STORED for dir
426 update(e);
427 } finally {
428 endWrite();
429 }
430 }
431
432 void copyFile(boolean deletesrc, byte[]src, byte[] dst, CopyOption... options)
433 throws IOException
434 {
435 checkWritable();
436 if (Arrays.equals(src, dst))
437 return; // do nothing, src and dst are the same
438
439 beginWrite();
440 try {
441 ensureOpen();
442 Entry eSrc = getEntry0(src); // ensureOpen checked
443 if (eSrc == null)
444 throw new NoSuchFileException(getString(src));
445 if (eSrc.isDir()) { // spec says to create dst dir
446 createDirectory(dst);
447 return;
448 }
449 boolean hasReplace = false;
450 boolean hasCopyAttrs = false;
451 for (CopyOption opt : options) {
452 if (opt == REPLACE_EXISTING)
453 hasReplace = true;
454 else if (opt == COPY_ATTRIBUTES)
455 hasCopyAttrs = true;
456 }
457 Entry eDst = getEntry0(dst);
458 if (eDst != null) {
459 if (!hasReplace)
460 throw new FileAlreadyExistsException(getString(dst));
461 } else {
462 checkParents(dst);
463 }
464 Entry u = new Entry(eSrc, Entry.COPY); // copy eSrc entry
465 u.name(dst); // change name
466 if (eSrc.type == Entry.NEW || eSrc.type == Entry.FILECH)
467 {
468 u.type = eSrc.type; // make it the same type
469 if (deletesrc) { // if it's a "rename", take the data
470 u.bytes = eSrc.bytes;
471 u.file = eSrc.file;
472 } else { // if it's not "rename", copy the data
473 if (eSrc.bytes != null)
474 u.bytes = Arrays.copyOf(eSrc.bytes, eSrc.bytes.length);
475 else if (eSrc.file != null) {
476 u.file = getTempPathForEntry(null);
477 Files.copy(eSrc.file, u.file, REPLACE_EXISTING);
478 }
479 }
480 }
481 if (!hasCopyAttrs)
482 u.mtime = u.atime= u.ctime = System.currentTimeMillis();
483 update(u);
484 if (deletesrc)
485 updateDelete(eSrc);
486 } finally {
487 endWrite();
488 }
489 }
490
491 // Returns an output stream for writing the contents into the specified
492 // entry.
493 OutputStream newOutputStream(byte[] path, OpenOption... options)
494 throws IOException
495 {
496 checkWritable();
497 boolean hasCreateNew = false;
498 boolean hasCreate = false;
499 boolean hasAppend = false;
500 for (OpenOption opt: options) {
501 if (opt == READ)
502 throw new IllegalArgumentException("READ not allowed");
503 if (opt == CREATE_NEW)
504 hasCreateNew = true;
505 if (opt == CREATE)
506 hasCreate = true;
507 if (opt == APPEND)
508 hasAppend = true;
509 }
510 beginRead(); // only need a readlock, the "update()" will
511 try { // try to obtain a writelock when the os is
512 ensureOpen(); // being closed.
513 Entry e = getEntry0(path);
514 if (e != null) {
515 if (e.isDir() || hasCreateNew)
516 throw new FileAlreadyExistsException(getString(path));
517 if (hasAppend) {
518 InputStream is = getInputStream(e);
519 OutputStream os = getOutputStream(new Entry(e, Entry.NEW));
520 copyStream(is, os);
521 is.close();
522 return os;
523 }
524 return getOutputStream(new Entry(e, Entry.NEW));
525 } else {
526 if (!hasCreate && !hasCreateNew)
527 throw new NoSuchFileException(getString(path));
528 checkParents(path);
529 return getOutputStream(new Entry(path, Entry.NEW));
530 }
531 } finally {
532 endRead();
533 }
534 }
535
536 // Returns an input stream for reading the contents of the specified
537 // file entry.
538 InputStream newInputStream(byte[] path) throws IOException {
539 beginRead();
540 try {
541 ensureOpen();
542 Entry e = getEntry0(path);
543 if (e == null)
544 throw new NoSuchFileException(getString(path));
545 if (e.isDir())
546 throw new FileSystemException(getString(path), "is a directory", null);
547 return getInputStream(e);
548 } finally {
549 endRead();
550 }
551 }
552
553 private void checkOptions(Set<? extends OpenOption> options) {
554 // check for options of null type and option is an intance of StandardOpenOption
555 for (OpenOption option : options) {
556 if (option == null)
557 throw new NullPointerException();
558 if (!(option instanceof StandardOpenOption))
559 throw new IllegalArgumentException();
560 }
561 }
562
563 // Returns a Writable/ReadByteChannel for now. Might consdier to use
564 // newFileChannel() instead, which dump the entry data into a regular
565 // file on the default file system and create a FileChannel on top of
566 // it.
567 SeekableByteChannel newByteChannel(byte[] path,
568 Set<? extends OpenOption> options,
569 FileAttribute<?>... attrs)
570 throws IOException
571 {
572 checkOptions(options);
573 if (options.contains(StandardOpenOption.WRITE) ||
574 options.contains(StandardOpenOption.APPEND)) {
575 checkWritable();
576 beginRead();
577 try {
578 final WritableByteChannel wbc = Channels.newChannel(
579 newOutputStream(path, options.toArray(new OpenOption[0])));
580 long leftover = 0;
581 if (options.contains(StandardOpenOption.APPEND)) {
582 Entry e = getEntry0(path);
583 if (e != null && e.size >= 0)
584 leftover = e.size;
585 }
586 final long offset = leftover;
587 return new SeekableByteChannel() {
588 long written = offset;
589 public boolean isOpen() {
590 return wbc.isOpen();
591 }
592
593 public long position() throws IOException {
594 return written;
595 }
596
597 public SeekableByteChannel position(long pos)
598 throws IOException
599 {
600 throw new UnsupportedOperationException();
601 }
602
603 public int read(ByteBuffer dst) throws IOException {
604 throw new UnsupportedOperationException();
605 }
606
607 public SeekableByteChannel truncate(long size)
608 throws IOException
609 {
610 throw new UnsupportedOperationException();
611 }
612
613 public int write(ByteBuffer src) throws IOException {
614 int n = wbc.write(src);
615 written += n;
616 return n;
617 }
618
619 public long size() throws IOException {
620 return written;
621 }
622
623 public void close() throws IOException {
624 wbc.close();
625 }
626 };
627 } finally {
628 endRead();
629 }
630 } else {
631 beginRead();
632 try {
633 ensureOpen();
634 Entry e = getEntry0(path);
635 if (e == null || e.isDir())
636 throw new NoSuchFileException(getString(path));
637 final ReadableByteChannel rbc =
638 Channels.newChannel(getInputStream(e));
639 final long size = e.size;
640 return new SeekableByteChannel() {
641 long read = 0;
642 public boolean isOpen() {
643 return rbc.isOpen();
644 }
645
646 public long position() throws IOException {
647 return read;
648 }
649
650 public SeekableByteChannel position(long pos)
651 throws IOException
652 {
653 throw new UnsupportedOperationException();
654 }
655
656 public int read(ByteBuffer dst) throws IOException {
657 int n = rbc.read(dst);
658 if (n > 0) {
659 read += n;
660 }
661 return n;
662 }
663
664 public SeekableByteChannel truncate(long size)
665 throws IOException
666 {
667 throw new NonWritableChannelException();
668 }
669
670 public int write (ByteBuffer src) throws IOException {
671 throw new NonWritableChannelException();
672 }
673
674 public long size() throws IOException {
675 return size;
676 }
677
678 public void close() throws IOException {
679 rbc.close();
680 }
681 };
682 } finally {
683 endRead();
684 }
685 }
686 }
687
688 // Returns a FileChannel of the specified entry.
689 //
690 // This implementation creates a temporary file on the default file system,
691 // copy the entry data into it if the entry exists, and then create a
692 // FileChannel on top of it.
693 FileChannel newFileChannel(byte[] path,
694 Set<? extends OpenOption> options,
695 FileAttribute<?>... attrs)
696 throws IOException
697 {
698 checkOptions(options);
699 final boolean forWrite = (options.contains(StandardOpenOption.WRITE) ||
700 options.contains(StandardOpenOption.APPEND));
701 beginRead();
702 try {
703 ensureOpen();
704 Entry e = getEntry0(path);
705 if (forWrite) {
706 checkWritable();
707 if (e == null) {
708 if (!options.contains(StandardOpenOption.CREATE_NEW))
709 throw new NoSuchFileException(getString(path));
710 } else {
711 if (options.contains(StandardOpenOption.CREATE_NEW))
712 throw new FileAlreadyExistsException(getString(path));
713 if (e.isDir())
714 throw new FileAlreadyExistsException("directory <"
715 + getString(path) + "> exists");
716 }
717 options.remove(StandardOpenOption.CREATE_NEW); // for tmpfile
718 } else if (e == null || e.isDir()) {
719 throw new NoSuchFileException(getString(path));
720 }
721
722 final boolean isFCH = (e != null && e.type == Entry.FILECH);
723 final Path tmpfile = isFCH ? e.file : getTempPathForEntry(path);
724 final FileChannel fch = tmpfile.getFileSystem()
725 .provider()
726 .newFileChannel(tmpfile, options, attrs);
727 final Entry u = isFCH ? e : new Entry(path, tmpfile, Entry.FILECH);
728 if (forWrite) {
729 u.flag = FLAG_DATADESCR;
730 u.method = METHOD_DEFLATED;
731 }
732 // is there a better way to hook into the FileChannel's close method?
733 return new FileChannel() {
734 public int write(ByteBuffer src) throws IOException {
735 return fch.write(src);
736 }
737 public long write(ByteBuffer[] srcs, int offset, int length)
738 throws IOException
739 {
740 return fch.write(srcs, offset, length);
741 }
742 public long position() throws IOException {
743 return fch.position();
744 }
745 public FileChannel position(long newPosition)
746 throws IOException
747 {
748 fch.position(newPosition);
749 return this;
750 }
751 public long size() throws IOException {
752 return fch.size();
753 }
754 public FileChannel truncate(long size)
755 throws IOException
756 {
757 fch.truncate(size);
758 return this;
759 }
760 public void force(boolean metaData)
761 throws IOException
762 {
763 fch.force(metaData);
764 }
765 public long transferTo(long position, long count,
766 WritableByteChannel target)
767 throws IOException
768 {
769 return fch.transferTo(position, count, target);
770 }
771 public long transferFrom(ReadableByteChannel src,
772 long position, long count)
773 throws IOException
774 {
775 return fch.transferFrom(src, position, count);
776 }
777 public int read(ByteBuffer dst) throws IOException {
778 return fch.read(dst);
779 }
780 public int read(ByteBuffer dst, long position)
781 throws IOException
782 {
783 return fch.read(dst, position);
784 }
785 public long read(ByteBuffer[] dsts, int offset, int length)
786 throws IOException
787 {
788 return fch.read(dsts, offset, length);
789 }
790 public int write(ByteBuffer src, long position)
791 throws IOException
792 {
793 return fch.write(src, position);
794 }
795 public MappedByteBuffer map(MapMode mode,
796 long position, long size)
797 throws IOException
798 {
799 throw new UnsupportedOperationException();
800 }
801 public FileLock lock(long position, long size, boolean shared)
802 throws IOException
803 {
804 return fch.lock(position, size, shared);
805 }
806 public FileLock tryLock(long position, long size, boolean shared)
807 throws IOException
808 {
809 return fch.tryLock(position, size, shared);
810 }
811 protected void implCloseChannel() throws IOException {
812 fch.close();
813 if (forWrite) {
814 u.mtime = System.currentTimeMillis();
815 u.size = Files.size(u.file);
816
817 update(u);
818 } else {
819 if (!isFCH) // if this is a new fch for reading
820 removeTempPathForEntry(tmpfile);
821 }
822 }
823 };
824 } finally {
825 endRead();
826 }
827 }
828
829 // the outstanding input streams that need to be closed
830 private Set<InputStream> streams =
831 Collections.synchronizedSet(new HashSet<InputStream>());
832
833 // the ex-channel and ex-path that need to close when their outstanding
834 // input streams are all closed by the obtainers.
835 private Set<ExChannelCloser> exChClosers = new HashSet<>();
836
837 private Set<Path> tmppaths = Collections.synchronizedSet(new HashSet<Path>());
838 private Path getTempPathForEntry(byte[] path) throws IOException {
839 Path tmpPath = createTempFileInSameDirectoryAs(zfpath);
840 if (path != null) {
841 Entry e = getEntry0(path);
842 if (e != null) {
843 try (InputStream is = newInputStream(path)) {
844 Files.copy(is, tmpPath, REPLACE_EXISTING);
845 }
846 }
847 }
848 return tmpPath;
849 }
850
851 private void removeTempPathForEntry(Path path) throws IOException {
852 Files.delete(path);
853 tmppaths.remove(path);
854 }
855
856 // check if all parents really exit. ZIP spec does not require
857 // the existence of any "parent directory".
858 private void checkParents(byte[] path) throws IOException {
859 beginRead();
860 try {
861 while ((path = getParent(path)) != null && path.length != 0) {
862 if (!inodes.containsKey(IndexNode.keyOf(path))) {
863 throw new NoSuchFileException(getString(path));
864 }
865 }
866 } finally {
867 endRead();
868 }
869 }
870
871 private static byte[] ROOTPATH = new byte[0];
872 private static byte[] getParent(byte[] path) {
873 int off = path.length - 1;
874 if (off > 0 && path[off] == '/') // isDirectory
875 off--;
876 while (off > 0 && path[off] != '/') { off--; }
877 if (off <= 0)
878 return ROOTPATH;
879 return Arrays.copyOf(path, off + 1);
880 }
881
882 private final void beginWrite() {
883 rwlock.writeLock().lock();
884 }
885
886 private final void endWrite() {
887 rwlock.writeLock().unlock();
888 }
889
890 private final void beginRead() {
891 rwlock.readLock().lock();
892 }
893
894 private final void endRead() {
895 rwlock.readLock().unlock();
896 }
897
898 ///////////////////////////////////////////////////////////////////
899
900 private volatile boolean isOpen = true;
901 private final SeekableByteChannel ch; // channel to the zipfile
902 final byte[] cen; // CEN & ENDHDR
903 private END end;
904 private long locpos; // position of first LOC header (usually 0)
905
906 private final ReadWriteLock rwlock = new ReentrantReadWriteLock();
907
908 // name -> pos (in cen), IndexNode itself can be used as a "key"
909 private LinkedHashMap<IndexNode, IndexNode> inodes;
910
911 final byte[] getBytes(String name) {
912 return zc.getBytes(name);
913 }
914
915 final String getString(byte[] name) {
916 return zc.toString(name);
917 }
918
919 protected void finalize() throws IOException {
920 close();
921 }
922
923 private long getDataPos(Entry e) throws IOException {
924 if (e.locoff == -1) {
925 Entry e2 = getEntry0(e.name);
926 if (e2 == null)
927 throw new ZipException("invalid loc for entry <" + e.name + ">");
928 e.locoff = e2.locoff;
929 }
930 byte[] buf = new byte[LOCHDR];
931 if (readFullyAt(buf, 0, buf.length, e.locoff) != buf.length)
932 throw new ZipException("invalid loc for entry <" + e.name + ">");
933 return locpos + e.locoff + LOCHDR + LOCNAM(buf) + LOCEXT(buf);
934 }
935
936 // Reads len bytes of data from the specified offset into buf.
937 // Returns the total number of bytes read.
938 // Each/every byte read from here (except the cen, which is mapped).
939 final long readFullyAt(byte[] buf, int off, long len, long pos)
940 throws IOException
941 {
942 ByteBuffer bb = ByteBuffer.wrap(buf);
943 bb.position(off);
944 bb.limit((int)(off + len));
945 return readFullyAt(bb, pos);
946 }
947
948 private final long readFullyAt(ByteBuffer bb, long pos)
949 throws IOException
950 {
951 synchronized(ch) {
952 return ch.position(pos).read(bb);
953 }
954 }
955
956 // Searches for end of central directory (END) header. The contents of
957 // the END header will be read and placed in endbuf. Returns the file
958 // position of the END header, otherwise returns -1 if the END header
959 // was not found or an error occurred.
960 private END findEND() throws IOException
961 {
962 byte[] buf = new byte[READBLOCKSZ];
963 long ziplen = ch.size();
964 long minHDR = (ziplen - END_MAXLEN) > 0 ? ziplen - END_MAXLEN : 0;
965 long minPos = minHDR - (buf.length - ENDHDR);
966
967 for (long pos = ziplen - buf.length; pos >= minPos; pos -= (buf.length - ENDHDR))
968 {
969 int off = 0;
970 if (pos < 0) {
971 // Pretend there are some NUL bytes before start of file
972 off = (int)-pos;
973 Arrays.fill(buf, 0, off, (byte)0);
974 }
975 int len = buf.length - off;
976 if (readFullyAt(buf, off, len, pos + off) != len)
977 zerror("zip END header not found");
978
979 // Now scan the block backwards for END header signature
980 for (int i = buf.length - ENDHDR; i >= 0; i--) {
981 if (buf[i+0] == (byte)'P' &&
982 buf[i+1] == (byte)'K' &&
983 buf[i+2] == (byte)'\005' &&
984 buf[i+3] == (byte)'\006' &&
985 (pos + i + ENDHDR + ENDCOM(buf, i) == ziplen)) {
986 // Found END header
987 buf = Arrays.copyOfRange(buf, i, i + ENDHDR);
988 END end = new END();
989 end.endsub = ENDSUB(buf);
990 end.centot = ENDTOT(buf);
991 end.cenlen = ENDSIZ(buf);
992 end.cenoff = ENDOFF(buf);
993 end.comlen = ENDCOM(buf);
994 end.endpos = pos + i;
995 if (end.cenlen == ZIP64_MINVAL ||
996 end.cenoff == ZIP64_MINVAL ||
997 end.centot == ZIP64_MINVAL32)
998 {
999 // need to find the zip64 end;
1000 byte[] loc64 = new byte[ZIP64_LOCHDR];
1001 if (readFullyAt(loc64, 0, loc64.length, end.endpos - ZIP64_LOCHDR)
1002 != loc64.length) {
1003 return end;
1004 }
1005 long end64pos = ZIP64_LOCOFF(loc64);
1006 byte[] end64buf = new byte[ZIP64_ENDHDR];
1007 if (readFullyAt(end64buf, 0, end64buf.length, end64pos)
1008 != end64buf.length) {
1009 return end;
1010 }
1011 // end64 found, re-calcualte everything.
1012 end.cenlen = ZIP64_ENDSIZ(end64buf);
1013 end.cenoff = ZIP64_ENDOFF(end64buf);
1014 end.centot = (int)ZIP64_ENDTOT(end64buf); // assume total < 2g
1015 end.endpos = end64pos;
1016 }
1017 return end;
1018 }
1019 }
1020 }
1021 zerror("zip END header not found");
1022 return null; //make compiler happy
1023 }
1024
1025 // Reads zip file central directory. Returns the file position of first
1026 // CEN header, otherwise returns -1 if an error occurred. If zip->msg != NULL
1027 // then the error was a zip format error and zip->msg has the error text.
1028 // Always pass in -1 for knownTotal; it's used for a recursive call.
1029 private byte[] initCEN() throws IOException {
1030 end = findEND();
1031 if (end.endpos == 0) {
1032 inodes = new LinkedHashMap<>(10);
1033 locpos = 0;
1034 buildNodeTree();
1035 return null; // only END header present
1036 }
1037 if (end.cenlen > end.endpos)
1038 zerror("invalid END header (bad central directory size)");
1039 long cenpos = end.endpos - end.cenlen; // position of CEN table
1040
1041 // Get position of first local file (LOC) header, taking into
1042 // account that there may be a stub prefixed to the zip file.
1043 locpos = cenpos - end.cenoff;
1044 if (locpos < 0)
1045 zerror("invalid END header (bad central directory offset)");
1046
1047 // read in the CEN and END
1048 byte[] cen = new byte[(int)(end.cenlen + ENDHDR)];
1049 if (readFullyAt(cen, 0, cen.length, cenpos) != end.cenlen + ENDHDR) {
1050 zerror("read CEN tables failed");
1051 }
1052 // Iterate through the entries in the central directory
1053 inodes = new LinkedHashMap<>(end.centot + 1);
1054 int pos = 0;
1055 int limit = cen.length - ENDHDR;
1056 while (pos < limit) {
1057 if (CENSIG(cen, pos) != CENSIG)
1058 zerror("invalid CEN header (bad signature)");
1059 int method = CENHOW(cen, pos);
1060 int nlen = CENNAM(cen, pos);
1061 int elen = CENEXT(cen, pos);
1062 int clen = CENCOM(cen, pos);
1063 if ((CENFLG(cen, pos) & 1) != 0)
1064 zerror("invalid CEN header (encrypted entry)");
1065 if (method != METHOD_STORED && method != METHOD_DEFLATED)
1066 zerror("invalid CEN header (unsupported compression method: " + method + ")");
1067 if (pos + CENHDR + nlen > limit)
1068 zerror("invalid CEN header (bad header size)");
1069 byte[] name = Arrays.copyOfRange(cen, pos + CENHDR, pos + CENHDR + nlen);
1070 IndexNode inode = new IndexNode(name, pos);
1071 inodes.put(inode, inode);
1072 // skip ext and comment
1073 pos += (CENHDR + nlen + elen + clen);
1074 }
1075 if (pos + ENDHDR != cen.length) {
1076 zerror("invalid CEN header (bad header size)");
1077 }
1078 buildNodeTree();
1079 return cen;
1080 }
1081
1082 private void ensureOpen() throws IOException {
1083 if (!isOpen)
1084 throw new ClosedFileSystemException();
1085 }
1086
1087 // Creates a new empty temporary file in the same directory as the
1088 // specified file. A variant of Files.createTempFile.
1089 private Path createTempFileInSameDirectoryAs(Path path)
1090 throws IOException
1091 {
1092 Path parent = path.toAbsolutePath().getParent();
1093 Path dir = (parent == null) ? path.getFileSystem().getPath(".") : parent;
1094 Path tmpPath = Files.createTempFile(dir, "zipfstmp", null);
1095 tmppaths.add(tmpPath);
1096 return tmpPath;
1097 }
1098
1099 ////////////////////update & sync //////////////////////////////////////
1100
1101 private boolean hasUpdate = false;
1102
1103 // shared key. consumer guarantees the "writeLock" before use it.
1104 private final IndexNode LOOKUPKEY = IndexNode.keyOf(null);
1105
1106 private void updateDelete(IndexNode inode) {
1107 beginWrite();
1108 try {
1109 removeFromTree(inode);
1110 inodes.remove(inode);
1111 hasUpdate = true;
1112 } finally {
1113 endWrite();
1114 }
1115 }
1116
1117 private void update(Entry e) {
1118 beginWrite();
1119 try {
1120 IndexNode old = inodes.put(e, e);
1121 if (old != null) {
1122 removeFromTree(old);
1123 }
1124 if (e.type == Entry.NEW || e.type == Entry.FILECH || e.type == Entry.COPY) {
1125 IndexNode parent = inodes.get(LOOKUPKEY.as(getParent(e.name)));
1126 e.sibling = parent.child;
1127 parent.child = e;
1128 }
1129 hasUpdate = true;
1130 } finally {
1131 endWrite();
1132 }
1133 }
1134
1135 // copy over the whole LOC entry (header if necessary, data and ext) from
1136 // old zip to the new one.
1137 private long copyLOCEntry(Entry e, boolean updateHeader,
1138 OutputStream os,
1139 long written, byte[] buf)
1140 throws IOException
1141 {
1142 long locoff = e.locoff; // where to read
1143 e.locoff = written; // update the e.locoff with new value
1144
1145 // calculate the size need to write out
1146 long size = 0;
1147 // if there is A ext
1148 if ((e.flag & FLAG_DATADESCR) != 0) {
1149 if (e.size >= ZIP64_MINVAL || e.csize >= ZIP64_MINVAL)
1150 size = 24;
1151 else
1152 size = 16;
1153 }
1154 // read loc, use the original loc.elen/nlen
1155 if (readFullyAt(buf, 0, LOCHDR , locoff) != LOCHDR)
1156 throw new ZipException("loc: reading failed");
1157 if (updateHeader) {
1158 locoff += LOCHDR + LOCNAM(buf) + LOCEXT(buf); // skip header
1159 size += e.csize;
1160 written = e.writeLOC(os) + size;
1161 } else {
1162 os.write(buf, 0, LOCHDR); // write out the loc header
1163 locoff += LOCHDR;
1164 // use e.csize, LOCSIZ(buf) is zero if FLAG_DATADESCR is on
1165 // size += LOCNAM(buf) + LOCEXT(buf) + LOCSIZ(buf);
1166 size += LOCNAM(buf) + LOCEXT(buf) + e.csize;
1167 written = LOCHDR + size;
1168 }
1169 int n;
1170 while (size > 0 &&
1171 (n = (int)readFullyAt(buf, 0, buf.length, locoff)) != -1)
1172 {
1173 if (size < n)
1174 n = (int)size;
1175 os.write(buf, 0, n);
1176 size -= n;
1177 locoff += n;
1178 }
1179 return written;
1180 }
1181
1182 // sync the zip file system, if there is any udpate
1183 private void sync() throws IOException {
1184 //System.out.printf("->sync(%s) starting....!%n", toString());
1185 // check ex-closer
1186 if (!exChClosers.isEmpty()) {
1187 for (ExChannelCloser ecc : exChClosers) {
1188 if (ecc.streams.isEmpty()) {
1189 ecc.ch.close();
1190 Files.delete(ecc.path);
1191 exChClosers.remove(ecc);
1192 }
1193 }
1194 }
1195 if (!hasUpdate)
1196 return;
1197 Path tmpFile = createTempFileInSameDirectoryAs(zfpath);
1198 try (OutputStream os = new BufferedOutputStream(Files.newOutputStream(tmpFile, WRITE)))
1199 {
1200 ArrayList<Entry> elist = new ArrayList<>(inodes.size());
1201 long written = 0;
1202 byte[] buf = new byte[8192];
1203 Entry e = null;
1204
1205 // write loc
1206 for (IndexNode inode : inodes.values()) {
1207 if (inode instanceof Entry) { // an updated inode
1208 e = (Entry)inode;
1209 try {
1210 if (e.type == Entry.COPY) {
1211 // entry copy: the only thing changed is the "name"
1212 // and "nlen" in LOC header, so we udpate/rewrite the
1213 // LOC in new file and simply copy the rest (data and
1214 // ext) without enflating/deflating from the old zip
1215 // file LOC entry.
1216 written += copyLOCEntry(e, true, os, written, buf);
1217 } else { // NEW, FILECH or CEN
1218 e.locoff = written;
1219 written += e.writeLOC(os); // write loc header
1220 if (e.bytes != null) { // in-memory, deflated
1221 os.write(e.bytes); // already
1222 written += e.bytes.length;
1223 } else if (e.file != null) { // tmp file
1224 try (InputStream is = Files.newInputStream(e.file)) {
1225 int n;
1226 if (e.type == Entry.NEW) { // deflated already
1227 while ((n = is.read(buf)) != -1) {
1228 os.write(buf, 0, n);
1229 written += n;
1230 }
1231 } else if (e.type == Entry.FILECH) {
1232 // the data are not deflated, use ZEOS
1233 try (OutputStream os2 = new EntryOutputStream(e, os)) {
1234 while ((n = is.read(buf)) != -1) {
1235 os2.write(buf, 0, n);
1236 }
1237 }
1238 written += e.csize;
1239 if ((e.flag & FLAG_DATADESCR) != 0)
1240 written += e.writeEXT(os);
1241 }
1242 }
1243 Files.delete(e.file);
1244 tmppaths.remove(e.file);
1245 } else {
1246 // dir, 0-length data
1247 }
1248 }
1249 elist.add(e);
1250 } catch (IOException x) {
1251 x.printStackTrace(); // skip any in-accurate entry
1252 }
1253 } else { // unchanged inode
1254 if (inode.pos == -1) {
1255 continue; // pseudo directory node
1256 }
1257 e = Entry.readCEN(this, inode.pos);
1258 try {
1259 written += copyLOCEntry(e, false, os, written, buf);
1260 elist.add(e);
1261 } catch (IOException x) {
1262 x.printStackTrace(); // skip any wrong entry
1263 }
1264 }
1265 }
1266
1267 // now write back the cen and end table
1268 end.cenoff = written;
1269 for (Entry entry : elist) {
1270 written += entry.writeCEN(os);
1271 }
1272 end.centot = elist.size();
1273 end.cenlen = written - end.cenoff;
1274 end.write(os, written);
1275 }
1276 if (!streams.isEmpty()) {
1277 //
1278 // TBD: ExChannelCloser should not be necessary if we only
1279 // sync when being closed, all streams should have been
1280 // closed already. Keep the logic here for now.
1281 //
1282 // There are outstanding input streams open on existing "ch",
1283 // so, don't close the "cha" and delete the "file for now, let
1284 // the "ex-channel-closer" to handle them
1285 ExChannelCloser ecc = new ExChannelCloser(
1286 createTempFileInSameDirectoryAs(zfpath),
1287 ch,
1288 streams);
1289 Files.move(zfpath, ecc.path, REPLACE_EXISTING);
1290 exChClosers.add(ecc);
1291 streams = Collections.synchronizedSet(new HashSet<InputStream>());
1292 } else {
1293 ch.close();
1294 Files.delete(zfpath);
1295 }
1296
1297 Files.move(tmpFile, zfpath, REPLACE_EXISTING);
1298 hasUpdate = false; // clear
1299 /*
1300 if (isOpen) {
1301 ch = zfpath.newByteChannel(READ); // re-fresh "ch" and "cen"
1302 cen = initCEN();
1303 }
1304 */
1305 //System.out.printf("->sync(%s) done!%n", toString());
1306 }
1307
1308 private IndexNode getInode(byte[] path) {
1309 if (path == null)
1310 throw new NullPointerException("path");
1311 IndexNode key = IndexNode.keyOf(path);
1312 IndexNode inode = inodes.get(key);
1313 if (inode == null &&
1314 (path.length == 0 || path[path.length -1] != '/')) {
1315 // if does not ends with a slash
1316 path = Arrays.copyOf(path, path.length + 1);
1317 path[path.length - 1] = '/';
1318 inode = inodes.get(key.as(path));
1319 }
1320 return inode;
1321 }
1322
1323 private Entry getEntry0(byte[] path) throws IOException {
1324 IndexNode inode = getInode(path);
1325 if (inode instanceof Entry)
1326 return (Entry)inode;
1327 if (inode == null || inode.pos == -1)
1328 return null;
1329 return Entry.readCEN(this, inode.pos);
1330 }
1331
1332 public void deleteFile(byte[] path, boolean failIfNotExists)
1333 throws IOException
1334 {
1335 checkWritable();
1336
1337 IndexNode inode = getInode(path);
1338 if (inode == null) {
1339 if (path != null && path.length == 0)
1340 throw new ZipException("root directory </> can't not be delete");
1341 if (failIfNotExists)
1342 throw new NoSuchFileException(getString(path));
1343 } else {
1344 if (inode.isDir() && inode.child != null)
1345 throw new DirectoryNotEmptyException(getString(path));
1346 updateDelete(inode);
1347 }
1348 }
1349
1350 private static void copyStream(InputStream is, OutputStream os)
1351 throws IOException
1352 {
1353 byte[] copyBuf = new byte[8192];
1354 int n;
1355 while ((n = is.read(copyBuf)) != -1) {
1356 os.write(copyBuf, 0, n);
1357 }
1358 }
1359
1360 // Returns an out stream for either
1361 // (1) writing the contents of a new entry, if the entry exits, or
1362 // (2) updating/replacing the contents of the specified existing entry.
1363 private OutputStream getOutputStream(Entry e) throws IOException {
1364
1365 if (e.mtime == -1)
1366 e.mtime = System.currentTimeMillis();
1367 if (e.method == -1)
1368 e.method = METHOD_DEFLATED; // TBD: use default method
1369 // store size, compressed size, and crc-32 in LOC header
1370 e.flag = 0;
1371 if (zc.isUTF8())
1372 e.flag |= FLAG_EFS;
1373 OutputStream os;
1374 if (useTempFile) {
1375 e.file = getTempPathForEntry(null);
1376 os = Files.newOutputStream(e.file, WRITE);
1377 } else {
1378 os = new ByteArrayOutputStream((e.size > 0)? (int)e.size : 8192);
1379 }
1380 return new EntryOutputStream(e, os);
1381 }
1382
1383 private InputStream getInputStream(Entry e)
1384 throws IOException
1385 {
1386 InputStream eis = null;
1387
1388 if (e.type == Entry.NEW) {
1389 if (e.bytes != null)
1390 eis = new ByteArrayInputStream(e.bytes);
1391 else if (e.file != null)
1392 eis = Files.newInputStream(e.file);
1393 else
1394 throw new ZipException("update entry data is missing");
1395 } else if (e.type == Entry.FILECH) {
1396 // FILECH result is un-compressed.
1397 eis = Files.newInputStream(e.file);
1398 // TBD: wrap to hook close()
1399 // streams.add(eis);
1400 return eis;
1401 } else { // untouced CEN or COPY
1402 eis = new EntryInputStream(e, ch);
1403 }
1404 if (e.method == METHOD_DEFLATED) {
1405 // MORE: Compute good size for inflater stream:
1406 long bufSize = e.size + 2; // Inflater likes a bit of slack
1407 if (bufSize > 65536)
1408 bufSize = 8192;
1409 final long size = e.size;
1410 eis = new InflaterInputStream(eis, getInflater(), (int)bufSize) {
1411
1412 private boolean isClosed = false;
1413 public void close() throws IOException {
1414 if (!isClosed) {
1415 releaseInflater(inf);
1416 this.in.close();
1417 isClosed = true;
1418 streams.remove(this);
1419 }
1420 }
1421 // Override fill() method to provide an extra "dummy" byte
1422 // at the end of the input stream. This is required when
1423 // using the "nowrap" Inflater option. (it appears the new
1424 // zlib in 7 does not need it, but keep it for now)
1425 protected void fill() throws IOException {
1426 if (eof) {
1427 throw new EOFException(
1428 "Unexpected end of ZLIB input stream");
1429 }
1430 len = this.in.read(buf, 0, buf.length);
1431 if (len == -1) {
1432 buf[0] = 0;
1433 len = 1;
1434 eof = true;
1435 }
1436 inf.setInput(buf, 0, len);
1437 }
1438 private boolean eof;
1439
1440 public int available() throws IOException {
1441 if (isClosed)
1442 return 0;
1443 long avail = size - inf.getBytesWritten();
1444 return avail > (long) Integer.MAX_VALUE ?
1445 Integer.MAX_VALUE : (int) avail;
1446 }
1447 };
1448 } else if (e.method == METHOD_STORED) {
1449 // TBD: wrap/ it does not seem necessary
1450 } else {
1451 throw new ZipException("invalid compression method");
1452 }
1453 streams.add(eis);
1454 return eis;
1455 }
1456
1457 // Inner class implementing the input stream used to read
1458 // a (possibly compressed) zip file entry.
1459 private class EntryInputStream extends InputStream {
1460 private final SeekableByteChannel zfch; // local ref to zipfs's "ch". zipfs.ch might
1461 // point to a new channel after sync()
1462 private long pos; // current position within entry data
1463 protected long rem; // number of remaining bytes within entry
1464 protected final long size; // uncompressed size of this entry
1465
1466 EntryInputStream(Entry e, SeekableByteChannel zfch)
1467 throws IOException
1468 {
1469 this.zfch = zfch;
1470 rem = e.csize;
1471 size = e.size;
1472 pos = getDataPos(e);
1473 }
1474 public int read(byte b[], int off, int len) throws IOException {
1475 ensureOpen();
1476 if (rem == 0) {
1477 return -1;
1478 }
1479 if (len <= 0) {
1480 return 0;
1481 }
1482 if (len > rem) {
1483 len = (int) rem;
1484 }
1485 // readFullyAt()
1486 long n = 0;
1487 ByteBuffer bb = ByteBuffer.wrap(b);
1488 bb.position(off);
1489 bb.limit(off + len);
1490 synchronized(zfch) {
1491 n = zfch.position(pos).read(bb);
1492 }
1493 if (n > 0) {
1494 pos += n;
1495 rem -= n;
1496 }
1497 if (rem == 0) {
1498 close();
1499 }
1500 return (int)n;
1501 }
1502 public int read() throws IOException {
1503 byte[] b = new byte[1];
1504 if (read(b, 0, 1) == 1) {
1505 return b[0] & 0xff;
1506 } else {
1507 return -1;
1508 }
1509 }
1510 public long skip(long n) throws IOException {
1511 ensureOpen();
1512 if (n > rem)
1513 n = rem;
1514 pos += n;
1515 rem -= n;
1516 if (rem == 0) {
1517 close();
1518 }
1519 return n;
1520 }
1521 public int available() {
1522 return rem > Integer.MAX_VALUE ? Integer.MAX_VALUE : (int) rem;
1523 }
1524 public long size() {
1525 return size;
1526 }
1527 public void close() {
1528 rem = 0;
1529 streams.remove(this);
1530 }
1531 }
1532
1533 class EntryOutputStream extends DeflaterOutputStream
1534 {
1535 private CRC32 crc;
1536 private Entry e;
1537 private long written;
1538
1539 EntryOutputStream(Entry e, OutputStream os)
1540 throws IOException
1541 {
1542 super(os, getDeflater());
1543 if (e == null)
1544 throw new NullPointerException("Zip entry is null");
1545 this.e = e;
1546 crc = new CRC32();
1547 }
1548
1549 @Override
1550 public void write(byte b[], int off, int len) throws IOException {
1551 if (e.type != Entry.FILECH) // only from sync
1552 ensureOpen();
1553 if (off < 0 || len < 0 || off > b.length - len) {
1554 throw new IndexOutOfBoundsException();
1555 } else if (len == 0) {
1556 return;
1557 }
1558 switch (e.method) {
1559 case METHOD_DEFLATED:
1560 super.write(b, off, len);
1561 break;
1562 case METHOD_STORED:
1563 written += len;
1564 out.write(b, off, len);
1565 break;
1566 default:
1567 throw new ZipException("invalid compression method");
1568 }
1569 crc.update(b, off, len);
1570 }
1571
1572 @Override
1573 public void close() throws IOException {
1574 // TBD ensureOpen();
1575 switch (e.method) {
1576 case METHOD_DEFLATED:
1577 finish();
1578 e.size = def.getBytesRead();
1579 e.csize = def.getBytesWritten();
1580 e.crc = crc.getValue();
1581 break;
1582 case METHOD_STORED:
1583 // we already know that both e.size and e.csize are the same
1584 e.size = e.csize = written;
1585 e.crc = crc.getValue();
1586 break;
1587 default:
1588 throw new ZipException("invalid compression method");
1589 }
1590 //crc.reset();
1591 if (out instanceof ByteArrayOutputStream)
1592 e.bytes = ((ByteArrayOutputStream)out).toByteArray();
1593
1594 if (e.type == Entry.FILECH) {
1595 releaseDeflater(def);
1596 return;
1597 }
1598 super.close();
1599 releaseDeflater(def);
1600 update(e);
1601 }
1602 }
1603
1604 static void zerror(String msg) {
1605 throw new ZipError(msg);
1606 }
1607
1608 // Maxmum number of de/inflater we cache
1609 private final int MAX_FLATER = 20;
1610 // List of available Inflater objects for decompression
1611 private final List<Inflater> inflaters = new ArrayList<>();
1612
1613 // Gets an inflater from the list of available inflaters or allocates
1614 // a new one.
1615 private Inflater getInflater() {
1616 synchronized (inflaters) {
1617 int size = inflaters.size();
1618 if (size > 0) {
1619 Inflater inf = inflaters.remove(size - 1);
1620 return inf;
1621 } else {
1622 return new Inflater(true);
1623 }
1624 }
1625 }
1626
1627 // Releases the specified inflater to the list of available inflaters.
1628 private void releaseInflater(Inflater inf) {
1629 synchronized (inflaters) {
1630 if (inflaters.size() < MAX_FLATER) {
1631 inf.reset();
1632 inflaters.add(inf);
1633 } else {
1634 inf.end();
1635 }
1636 }
1637 }
1638
1639 // List of available Deflater objects for compression
1640 private final List<Deflater> deflaters = new ArrayList<>();
1641
1642 // Gets an deflater from the list of available deflaters or allocates
1643 // a new one.
1644 private Deflater getDeflater() {
1645 synchronized (deflaters) {
1646 int size = deflaters.size();
1647 if (size > 0) {
1648 Deflater def = deflaters.remove(size - 1);
1649 return def;
1650 } else {
1651 return new Deflater(Deflater.DEFAULT_COMPRESSION, true);
1652 }
1653 }
1654 }
1655
1656 // Releases the specified inflater to the list of available inflaters.
1657 private void releaseDeflater(Deflater def) {
1658 synchronized (deflaters) {
1659 if (inflaters.size() < MAX_FLATER) {
1660 def.reset();
1661 deflaters.add(def);
1662 } else {
1663 def.end();
1664 }
1665 }
1666 }
1667
1668 // End of central directory record
1669 static class END {
1670 int disknum;
1671 int sdisknum;
1672 int endsub; // endsub
1673 int centot; // 4 bytes
1674 long cenlen; // 4 bytes
1675 long cenoff; // 4 bytes
1676 int comlen; // comment length
1677 byte[] comment;
1678
1679 /* members of Zip64 end of central directory locator */
1680 int diskNum;
1681 long endpos;
1682 int disktot;
1683
1684 void write(OutputStream os, long offset) throws IOException {
1685 boolean hasZip64 = false;
1686 long xlen = cenlen;
1687 long xoff = cenoff;
1688 if (xlen >= ZIP64_MINVAL) {
1689 xlen = ZIP64_MINVAL;
1690 hasZip64 = true;
1691 }
1692 if (xoff >= ZIP64_MINVAL) {
1693 xoff = ZIP64_MINVAL;
1694 hasZip64 = true;
1695 }
1696 int count = centot;
1697 if (count >= ZIP64_MINVAL32) {
1698 count = ZIP64_MINVAL32;
1699 hasZip64 = true;
1700 }
1701 if (hasZip64) {
1702 long off64 = offset;
1703 //zip64 end of central directory record
1704 writeInt(os, ZIP64_ENDSIG); // zip64 END record signature
1705 writeLong(os, ZIP64_ENDHDR - 12); // size of zip64 end
1706 writeShort(os, 45); // version made by
1707 writeShort(os, 45); // version needed to extract
1708 writeInt(os, 0); // number of this disk
1709 writeInt(os, 0); // central directory start disk
1710 writeLong(os, centot); // number of directory entires on disk
1711 writeLong(os, centot); // number of directory entires
1712 writeLong(os, cenlen); // length of central directory
1713 writeLong(os, cenoff); // offset of central directory
1714
1715 //zip64 end of central directory locator
1716 writeInt(os, ZIP64_LOCSIG); // zip64 END locator signature
1717 writeInt(os, 0); // zip64 END start disk
1718 writeLong(os, off64); // offset of zip64 END
1719 writeInt(os, 1); // total number of disks (?)
1720 }
1721 writeInt(os, ENDSIG); // END record signature
1722 writeShort(os, 0); // number of this disk
1723 writeShort(os, 0); // central directory start disk
1724 writeShort(os, count); // number of directory entries on disk
1725 writeShort(os, count); // total number of directory entries
1726 writeInt(os, xlen); // length of central directory
1727 writeInt(os, xoff); // offset of central directory
1728 if (comment != null) { // zip file comment
1729 writeShort(os, comment.length);
1730 writeBytes(os, comment);
1731 } else {
1732 writeShort(os, 0);
1733 }
1734 }
1735 }
1736
1737 // Internal node that links a "name" to its pos in cen table.
1738 // The node itself can be used as a "key" to lookup itself in
1739 // the HashMap inodes.
1740 static class IndexNode {
1741 byte[] name;
1742 int hashcode; // node is hashable/hashed by its name
1743 int pos = -1; // position in cen table, -1 menas the
1744 // entry does not exists in zip file
1745 IndexNode(byte[] name, int pos) {
1746 name(name);
1747 this.pos = pos;
1748 }
1749
1750 final static IndexNode keyOf(byte[] name) { // get a lookup key;
1751 return new IndexNode(name, -1);
1752 }
1753
1754 final void name(byte[] name) {
1755 this.name = name;
1756 this.hashcode = Arrays.hashCode(name);
1757 }
1758
1759 final IndexNode as(byte[] name) { // reuse the node, mostly
1760 name(name); // as a lookup "key"
1761 return this;
1762 }
1763
1764 boolean isDir() {
1765 return name != null &&
1766 (name.length == 0 || name[name.length - 1] == '/');
1767 }
1768
1769 public boolean equals(Object other) {
1770 if (!(other instanceof IndexNode)) {
1771 return false;
1772 }
1773 return Arrays.equals(name, ((IndexNode)other).name);
1774 }
1775
1776 public int hashCode() {
1777 return hashcode;
1778 }
1779
1780 IndexNode() {}
1781 IndexNode sibling;
1782 IndexNode child; // 1st child
1783 }
1784
1785 static class Entry extends IndexNode {
1786
1787 static final int CEN = 1; // entry read from cen
1788 static final int NEW = 2; // updated contents in bytes or file
1789 static final int FILECH = 3; // fch update in "file"
1790 static final int COPY = 4; // copy of a CEN entry
1791
1792
1793 byte[] bytes; // updated content bytes
1794 Path file; // use tmp file to store bytes;
1795 int type = CEN; // default is the entry read from cen
1796
1797 // entry attributes
1798 int version;
1799 int flag;
1800 int method = -1; // compression method
1801 long mtime = -1; // last modification time (in DOS time)
1802 long atime = -1; // last access time
1803 long ctime = -1; // create time
1804 long crc = -1; // crc-32 of entry data
1805 long csize = -1; // compressed size of entry data
1806 long size = -1; // uncompressed size of entry data
1807 byte[] extra;
1808
1809 // cen
1810 int versionMade;
1811 int disk;
1812 int attrs;
1813 long attrsEx;
1814 long locoff;
1815 byte[] comment;
1816
1817 Entry() {}
1818
1819 Entry(byte[] name) {
1820 name(name);
1821 this.mtime = this.ctime = this.atime = System.currentTimeMillis();
1822 this.crc = 0;
1823 this.size = 0;
1824 this.csize = 0;
1825 this.method = METHOD_DEFLATED;
1826 }
1827
1828 Entry(byte[] name, int type) {
1829 this(name);
1830 this.type = type;
1831 }
1832
1833 Entry (Entry e, int type) {
1834 name(e.name);
1835 this.version = e.version;
1836 this.ctime = e.ctime;
1837 this.atime = e.atime;
1838 this.mtime = e.mtime;
1839 this.crc = e.crc;
1840 this.size = e.size;
1841 this.csize = e.csize;
1842 this.method = e.method;
1843 this.extra = e.extra;
1844 this.versionMade = e.versionMade;
1845 this.disk = e.disk;
1846 this.attrs = e.attrs;
1847 this.attrsEx = e.attrsEx;
1848 this.locoff = e.locoff;
1849 this.comment = e.comment;
1850 this.type = type;
1851 }
1852
1853 Entry (byte[] name, Path file, int type) {
1854 this(name, type);
1855 this.file = file;
1856 this.method = METHOD_STORED;
1857 }
1858
1859 int version() throws ZipException {
1860 if (method == METHOD_DEFLATED)
1861 return 20;
1862 else if (method == METHOD_STORED)
1863 return 10;
1864 throw new ZipException("unsupported compression method");
1865 }
1866
1867 ///////////////////// CEN //////////////////////
1868 static Entry readCEN(ZipFileSystem zipfs, int pos)
1869 throws IOException
1870 {
1871 return new Entry().cen(zipfs, pos);
1872 }
1873
1874 private Entry cen(ZipFileSystem zipfs, int pos)
1875 throws IOException
1876 {
1877 byte[] cen = zipfs.cen;
1878 if (CENSIG(cen, pos) != CENSIG)
1879 zerror("invalid CEN header (bad signature)");
1880 versionMade = CENVEM(cen, pos);
1881 version = CENVER(cen, pos);
1882 flag = CENFLG(cen, pos);
1883 method = CENHOW(cen, pos);
1884 mtime = dosToJavaTime(CENTIM(cen, pos));
1885 crc = CENCRC(cen, pos);
1886 csize = CENSIZ(cen, pos);
1887 size = CENLEN(cen, pos);
1888 int nlen = CENNAM(cen, pos);
1889 int elen = CENEXT(cen, pos);
1890 int clen = CENCOM(cen, pos);
1891 disk = CENDSK(cen, pos);
1892 attrs = CENATT(cen, pos);
1893 attrsEx = CENATX(cen, pos);
1894 locoff = CENOFF(cen, pos);
1895
1896 pos += CENHDR;
1897 name(Arrays.copyOfRange(cen, pos, pos + nlen));
1898
1899 pos += nlen;
1900 if (elen > 0) {
1901 extra = Arrays.copyOfRange(cen, pos, pos + elen);
1902 pos += elen;
1903 readExtra(zipfs);
1904 }
1905 if (clen > 0) {
1906 comment = Arrays.copyOfRange(cen, pos, pos + clen);
1907 }
1908 return this;
1909 }
1910
1911 int writeCEN(OutputStream os) throws IOException
1912 {
1913 int written = CENHDR;
1914 int version0 = version();
1915 long csize0 = csize;
1916 long size0 = size;
1917 long locoff0 = locoff;
1918 int elen64 = 0; // extra for ZIP64
1919 int elenNTFS = 0; // extra for NTFS (a/c/mtime)
1920 int elenEXTT = 0; // extra for Extended Timestamp
1921 boolean foundExtraTime = false; // if time stamp NTFS, EXTT present
1922
1923 // confirm size/length
1924 int nlen = (name != null) ? name.length : 0;
1925 int elen = (extra != null) ? extra.length : 0;
1926 int eoff = 0;
1927 int clen = (comment != null) ? comment.length : 0;
1928 if (csize >= ZIP64_MINVAL) {
1929 csize0 = ZIP64_MINVAL;
1930 elen64 += 8; // csize(8)
1931 }
1932 if (size >= ZIP64_MINVAL) {
1933 size0 = ZIP64_MINVAL; // size(8)
1934 elen64 += 8;
1935 }
1936 if (locoff >= ZIP64_MINVAL) {
1937 locoff0 = ZIP64_MINVAL;
1938 elen64 += 8; // offset(8)
1939 }
1940 if (elen64 != 0) {
1941 elen64 += 4; // header and data sz 4 bytes
1942 }
1943 while (eoff + 4 < elen) {
1944 int tag = SH(extra, eoff);
1945 int sz = SH(extra, eoff + 2);
1946 if (tag == EXTID_EXTT || tag == EXTID_NTFS) {
1947 foundExtraTime = true;
1948 }
1949 eoff += (4 + sz);
1950 }
1951 if (!foundExtraTime) {
1952 if (isWindows) { // use NTFS
1953 elenNTFS = 36; // total 36 bytes
1954 } else { // Extended Timestamp otherwise
1955 elenEXTT = 9; // only mtime in cen
1956 }
1957 }
1958 writeInt(os, CENSIG); // CEN header signature
1959 if (elen64 != 0) {
1960 writeShort(os, 45); // ver 4.5 for zip64
1961 writeShort(os, 45);
1962 } else {
1963 writeShort(os, version0); // version made by
1964 writeShort(os, version0); // version needed to extract
1965 }
1966 writeShort(os, flag); // general purpose bit flag
1967 writeShort(os, method); // compression method
1968 // last modification time
1969 writeInt(os, (int)javaToDosTime(mtime));
1970 writeInt(os, crc); // crc-32
1971 writeInt(os, csize0); // compressed size
1972 writeInt(os, size0); // uncompressed size
1973 writeShort(os, name.length);
1974 writeShort(os, elen + elen64 + elenNTFS + elenEXTT);
1975
1976 if (comment != null) {
1977 writeShort(os, Math.min(clen, 0xffff));
1978 } else {
1979 writeShort(os, 0);
1980 }
1981 writeShort(os, 0); // starting disk number
1982 writeShort(os, 0); // internal file attributes (unused)
1983 writeInt(os, 0); // external file attributes (unused)
1984 writeInt(os, locoff0); // relative offset of local header
1985 writeBytes(os, name);
1986 if (elen64 != 0) {
1987 writeShort(os, EXTID_ZIP64);// Zip64 extra
1988 writeShort(os, elen64 - 4); // size of "this" extra block
1989 if (size0 == ZIP64_MINVAL)
1990 writeLong(os, size);
1991 if (csize0 == ZIP64_MINVAL)
1992 writeLong(os, csize);
1993 if (locoff0 == ZIP64_MINVAL)
1994 writeLong(os, locoff);
1995 }
1996 if (elenNTFS != 0) {
1997 writeShort(os, EXTID_NTFS);
1998 writeShort(os, elenNTFS - 4);
1999 writeInt(os, 0); // reserved
2000 writeShort(os, 0x0001); // NTFS attr tag
2001 writeShort(os, 24);
2002 writeLong(os, javaToWinTime(mtime));
2003 writeLong(os, javaToWinTime(atime));
2004 writeLong(os, javaToWinTime(ctime));
2005 }
2006 if (elenEXTT != 0) {
2007 writeShort(os, EXTID_EXTT);
2008 writeShort(os, elenEXTT - 4);
2009 if (ctime == -1)
2010 os.write(0x3); // mtime and atime
2011 else
2012 os.write(0x7); // mtime, atime and ctime
2013 writeInt(os, javaToUnixTime(mtime));
2014 }
2015 if (extra != null) // whatever not recognized
2016 writeBytes(os, extra);
2017 if (comment != null) //TBD: 0, Math.min(commentBytes.length, 0xffff));
2018 writeBytes(os, comment);
2019 return CENHDR + nlen + elen + clen + elen64 + elenNTFS + elenEXTT;
2020 }
2021
2022 ///////////////////// LOC //////////////////////
2023 static Entry readLOC(ZipFileSystem zipfs, long pos)
2024 throws IOException
2025 {
2026 return readLOC(zipfs, pos, new byte[1024]);
2027 }
2028
2029 static Entry readLOC(ZipFileSystem zipfs, long pos, byte[] buf)
2030 throws IOException
2031 {
2032 return new Entry().loc(zipfs, pos, buf);
2033 }
2034
2035 Entry loc(ZipFileSystem zipfs, long pos, byte[] buf)
2036 throws IOException
2037 {
2038 assert (buf.length >= LOCHDR);
2039 if (zipfs.readFullyAt(buf, 0, LOCHDR , pos) != LOCHDR)
2040 throw new ZipException("loc: reading failed");
2041 if (LOCSIG(buf) != LOCSIG)
2042 throw new ZipException("loc: wrong sig ->"
2043 + Long.toString(LOCSIG(buf), 16));
2044 //startPos = pos;
2045 version = LOCVER(buf);
2046 flag = LOCFLG(buf);
2047 method = LOCHOW(buf);
2048 mtime = dosToJavaTime(LOCTIM(buf));
2049 crc = LOCCRC(buf);
2050 csize = LOCSIZ(buf);
2051 size = LOCLEN(buf);
2052 int nlen = LOCNAM(buf);
2053 int elen = LOCEXT(buf);
2054
2055 name = new byte[nlen];
2056 if (zipfs.readFullyAt(name, 0, nlen, pos + LOCHDR) != nlen) {
2057 throw new ZipException("loc: name reading failed");
2058 }
2059 if (elen > 0) {
2060 extra = new byte[elen];
2061 if (zipfs.readFullyAt(extra, 0, elen, pos + LOCHDR + nlen)
2062 != elen) {
2063 throw new ZipException("loc: ext reading failed");
2064 }
2065 }
2066 pos += (LOCHDR + nlen + elen);
2067 if ((flag & FLAG_DATADESCR) != 0) {
2068 // Data Descriptor
2069 Entry e = zipfs.getEntry0(name); // get the size/csize from cen
2070 if (e == null)
2071 throw new ZipException("loc: name not found in cen");
2072 size = e.size;
2073 csize = e.csize;
2074 pos += (method == METHOD_STORED ? size : csize);
2075 if (size >= ZIP64_MINVAL || csize >= ZIP64_MINVAL)
2076 pos += 24;
2077 else
2078 pos += 16;
2079 } else {
2080 if (extra != null &&
2081 (size == ZIP64_MINVAL || csize == ZIP64_MINVAL)) {
2082 // zip64 ext: must include both size and csize
2083 int off = 0;
2084 while (off + 20 < elen) { // HeaderID+DataSize+Data
2085 int sz = SH(extra, off + 2);
2086 if (SH(extra, off) == EXTID_ZIP64 && sz == 16) {
2087 size = LL(extra, off + 4);
2088 csize = LL(extra, off + 12);
2089 break;
2090 }
2091 off += (sz + 4);
2092 }
2093 }
2094 pos += (method == METHOD_STORED ? size : csize);
2095 }
2096 return this;
2097 }
2098
2099 int writeLOC(OutputStream os)
2100 throws IOException
2101 {
2102 writeInt(os, LOCSIG); // LOC header signature
2103 int version = version();
2104 int nlen = (name != null) ? name.length : 0;
2105 int elen = (extra != null) ? extra.length : 0;
2106 boolean foundExtraTime = false; // if extra timestamp present
2107 int eoff = 0;
2108 int elen64 = 0;
2109 int elenEXTT = 0;
2110 int elenNTFS = 0;
2111 if ((flag & FLAG_DATADESCR) != 0) {
2112 writeShort(os, version()); // version needed to extract
2113 writeShort(os, flag); // general purpose bit flag
2114 writeShort(os, method); // compression method
2115 // last modification time
2116 writeInt(os, (int)javaToDosTime(mtime));
2117 // store size, uncompressed size, and crc-32 in data descriptor
2118 // immediately following compressed entry data
2119 writeInt(os, 0);
2120 writeInt(os, 0);
2121 writeInt(os, 0);
2122 } else {
2123 if (csize >= ZIP64_MINVAL || size >= ZIP64_MINVAL) {
2124 elen64 = 20; //headid(2) + size(2) + size(8) + csize(8)
2125 writeShort(os, 45); // ver 4.5 for zip64
2126 } else {
2127 writeShort(os, version()); // version needed to extract
2128 }
2129 writeShort(os, flag); // general purpose bit flag
2130 writeShort(os, method); // compression method
2131 // last modification time
2132 writeInt(os, (int)javaToDosTime(mtime));
2133 writeInt(os, crc); // crc-32
2134 if (elen64 != 0) {
2135 writeInt(os, ZIP64_MINVAL);
2136 writeInt(os, ZIP64_MINVAL);
2137 } else {
2138 writeInt(os, csize); // compressed size
2139 writeInt(os, size); // uncompressed size
2140 }
2141 }
2142 while (eoff + 4 < elen) {
2143 int tag = SH(extra, eoff);
2144 int sz = SH(extra, eoff + 2);
2145 if (tag == EXTID_EXTT || tag == EXTID_NTFS) {
2146 foundExtraTime = true;
2147 }
2148 eoff += (4 + sz);
2149 }
2150 if (!foundExtraTime) {
2151 if (isWindows) {
2152 elenNTFS = 36; // NTFS, total 36 bytes
2153 } else { // on unix use "ext time"
2154 elenEXTT = 9;
2155 if (atime != -1)
2156 elenEXTT += 4;
2157 if (ctime != -1)
2158 elenEXTT += 4;
2159 }
2160 }
2161 writeShort(os, name.length);
2162 writeShort(os, elen + elen64 + elenNTFS + elenEXTT);
2163 writeBytes(os, name);
2164 if (elen64 != 0) {
2165 writeShort(os, EXTID_ZIP64);
2166 writeShort(os, 16);
2167 writeLong(os, size);
2168 writeLong(os, csize);
2169 }
2170 if (elenNTFS != 0) {
2171 writeShort(os, EXTID_NTFS);
2172 writeShort(os, elenNTFS - 4);
2173 writeInt(os, 0); // reserved
2174 writeShort(os, 0x0001); // NTFS attr tag
2175 writeShort(os, 24);
2176 writeLong(os, javaToWinTime(mtime));
2177 writeLong(os, javaToWinTime(atime));
2178 writeLong(os, javaToWinTime(ctime));
2179 }
2180 if (elenEXTT != 0) {
2181 writeShort(os, EXTID_EXTT);
2182 writeShort(os, elenEXTT - 4);// size for the folowing data block
2183 int fbyte = 0x1;
2184 if (atime != -1) // mtime and atime
2185 fbyte |= 0x2;
2186 if (ctime != -1) // mtime, atime and ctime
2187 fbyte |= 0x4;
2188 os.write(fbyte); // flags byte
2189 writeInt(os, javaToUnixTime(mtime));
2190 if (atime != -1)
2191 writeInt(os, javaToUnixTime(atime));
2192 if (ctime != -1)
2193 writeInt(os, javaToUnixTime(ctime));
2194 }
2195 if (extra != null) {
2196 writeBytes(os, extra);
2197 }
2198 return LOCHDR + name.length + elen + elen64 + elenNTFS + elenEXTT;
2199 }
2200
2201 // Data Descriptior
2202 int writeEXT(OutputStream os)
2203 throws IOException
2204 {
2205 writeInt(os, EXTSIG); // EXT header signature
2206 writeInt(os, crc); // crc-32
2207 if (csize >= ZIP64_MINVAL || size >= ZIP64_MINVAL) {
2208 writeLong(os, csize);
2209 writeLong(os, size);
2210 return 24;
2211 } else {
2212 writeInt(os, csize); // compressed size
2213 writeInt(os, size); // uncompressed size
2214 return 16;
2215 }
2216 }
2217
2218 // read NTFS, UNIX and ZIP64 data from cen.extra
2219 void readExtra(ZipFileSystem zipfs) throws IOException {
2220 if (extra == null)
2221 return;
2222 int elen = extra.length;
2223 int off = 0;
2224 int newOff = 0;
2225 while (off + 4 < elen) {
2226 // extra spec: HeaderID+DataSize+Data
2227 int pos = off;
2228 int tag = SH(extra, pos);
2229 int sz = SH(extra, pos + 2);
2230 pos += 4;
2231 if (pos + sz > elen) // invalid data
2232 break;
2233 switch (tag) {
2234 case EXTID_ZIP64 :
2235 if (size == ZIP64_MINVAL) {
2236 if (pos + 8 > elen) // invalid zip64 extra
2237 break; // fields, just skip
2238 size = LL(extra, pos);
2239 pos += 8;
2240 }
2241 if (csize == ZIP64_MINVAL) {
2242 if (pos + 8 > elen)
2243 break;
2244 csize = LL(extra, pos);
2245 pos += 8;
2246 }
2247 if (locoff == ZIP64_MINVAL) {
2248 if (pos + 8 > elen)
2249 break;
2250 locoff = LL(extra, pos);
2251 pos += 8;
2252 }
2253 break;
2254 case EXTID_NTFS:
2255 if (sz < 32)
2256 break;
2257 pos += 4; // reserved 4 bytes
2258 if (SH(extra, pos) != 0x0001)
2259 break;
2260 if (SH(extra, pos + 2) != 24)
2261 break;
2262 // override the loc field, datatime here is
2263 // more "accurate"
2264 mtime = winToJavaTime(LL(extra, pos + 4));
2265 atime = winToJavaTime(LL(extra, pos + 12));
2266 ctime = winToJavaTime(LL(extra, pos + 20));
2267 break;
2268 case EXTID_EXTT:
2269 // spec says the Extened timestamp in cen only has mtime
2270 // need to read the loc to get the extra a/ctime
2271 byte[] buf = new byte[LOCHDR];
2272 if (zipfs.readFullyAt(buf, 0, buf.length , locoff)
2273 != buf.length)
2274 throw new ZipException("loc: reading failed");
2275 if (LOCSIG(buf) != LOCSIG)
2276 throw new ZipException("loc: wrong sig ->"
2277 + Long.toString(LOCSIG(buf), 16));
2278
2279 int locElen = LOCEXT(buf);
2280 if (locElen < 9) // EXTT is at lease 9 bytes
2281 break;
2282 int locNlen = LOCNAM(buf);
2283 buf = new byte[locElen];
2284 if (zipfs.readFullyAt(buf, 0, buf.length , locoff + LOCHDR + locNlen)
2285 != buf.length)
2286 throw new ZipException("loc extra: reading failed");
2287 int locPos = 0;
2288 while (locPos + 4 < buf.length) {
2289 int locTag = SH(buf, locPos);
2290 int locSZ = SH(buf, locPos + 2);
2291 locPos += 4;
2292 if (locTag != EXTID_EXTT) {
2293 locPos += locSZ;
2294 continue;
2295 }
2296 int flag = CH(buf, locPos++);
2297 if ((flag & 0x1) != 0) {
2298 mtime = unixToJavaTime(LG(buf, locPos));
2299 locPos += 4;
2300 }
2301 if ((flag & 0x2) != 0) {
2302 atime = unixToJavaTime(LG(buf, locPos));
2303 locPos += 4;
2304 }
2305 if ((flag & 0x4) != 0) {
2306 ctime = unixToJavaTime(LG(buf, locPos));
2307 locPos += 4;
2308 }
2309 break;
2310 }
2311 break;
2312 default: // unknown tag
2313 System.arraycopy(extra, off, extra, newOff, sz + 4);
2314 newOff += (sz + 4);
2315 }
2316 off += (sz + 4);
2317 }
2318 if (newOff != 0 && newOff != extra.length)
2319 extra = Arrays.copyOf(extra, newOff);
2320 else
2321 extra = null;
2322 }
2323 }
2324
2325 private static class ExChannelCloser {
2326 Path path;
2327 SeekableByteChannel ch;
2328 Set<InputStream> streams;
2329 ExChannelCloser(Path path,
2330 SeekableByteChannel ch,
2331 Set<InputStream> streams)
2332 {
2333 this.path = path;
2334 this.ch = ch;
2335 this.streams = streams;
2336 }
2337 }
2338
2339 // ZIP directory has two issues:
2340 // (1) ZIP spec does not require the ZIP file to include
2341 // directory entry
2342 // (2) all entries are not stored/organized in a "tree"
2343 // structure.
2344 // A possible solution is to build the node tree ourself as
2345 // implemented below.
2346 private IndexNode root;
2347
2348 private void addToTree(IndexNode inode, HashSet<IndexNode> dirs) {
2349 if (dirs.contains(inode)) {
2350 return;
2351 }
2352 IndexNode parent;
2353 byte[] name = inode.name;
2354 byte[] pname = getParent(name);
2355 if (inodes.containsKey(LOOKUPKEY.as(pname))) {
2356 parent = inodes.get(LOOKUPKEY);
2357 } else { // pseudo directory entry
2358 parent = new IndexNode(pname, -1);
2359 inodes.put(parent, parent);
2360 }
2361 addToTree(parent, dirs);
2362 inode.sibling = parent.child;
2363 parent.child = inode;
2364 if (name[name.length -1] == '/')
2365 dirs.add(inode);
2366 }
2367
2368 private void removeFromTree(IndexNode inode) {
2369 IndexNode parent = inodes.get(LOOKUPKEY.as(getParent(inode.name)));
2370 IndexNode child = parent.child;
2371 if (child.equals(inode)) {
2372 parent.child = child.sibling;
2373 } else {
2374 IndexNode last = child;
2375 while ((child = child.sibling) != null) {
2376 if (child.equals(inode)) {
2377 last.sibling = child.sibling;
2378 break;
2379 } else {
2380 last = child;
2381 }
2382 }
2383 }
2384 }
2385
2386 private void buildNodeTree() throws IOException {
2387 beginWrite();
2388 try {
2389 HashSet<IndexNode> dirs = new HashSet<>();
2390 IndexNode root = new IndexNode(ROOTPATH, -1);
2391 inodes.put(root, root);
2392 dirs.add(root);
2393 for (IndexNode node : inodes.keySet().toArray(new IndexNode[0])) {
2394 addToTree(node, dirs);
2395 }
2396 } finally {
2397 endWrite();
2398 }
2399 }
2400 }