/src/share/demo/nio/zipfs/src/com/sun/nio/zipfs/ZipFileSystem.java
Java | 2358 lines | 1990 code | 172 blank | 196 comment | 502 complexity | 94cbe586c572d4446be199730c79f6c8 MD5 | raw file
Possible License(s): BSD-3-Clause-No-Nuclear-License-2014, LGPL-3.0, GPL-2.0
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- /*
- * Copyright (c) 2009, 2011, Oracle and/or its affiliates. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * - Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * - Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * - Neither the name of Oracle nor the names of its
- * contributors may be used to endorse or promote products derived
- * from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
- * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
- * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
- * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
- /*
- * This source code is provided to illustrate the usage of a given feature
- * or technique and has been deliberately simplified. Additional steps
- * required for a production-quality application, such as security checks,
- * input validation and proper error handling, might not be present in
- * this sample code.
- */
- package com.sun.nio.zipfs;
- import java.io.BufferedOutputStream;
- import java.io.ByteArrayInputStream;
- import java.io.ByteArrayOutputStream;
- import java.io.EOFException;
- import java.io.File;
- import java.io.IOException;
- import java.io.InputStream;
- import java.io.OutputStream;
- import java.nio.ByteBuffer;
- import java.nio.MappedByteBuffer;
- import java.nio.channels.*;
- import java.nio.file.*;
- import java.nio.file.attribute.*;
- import java.nio.file.spi.*;
- import java.util.*;
- import java.util.concurrent.locks.ReadWriteLock;
- import java.util.concurrent.locks.ReentrantReadWriteLock;
- import java.util.regex.Pattern;
- import java.util.zip.CRC32;
- import java.util.zip.Inflater;
- import java.util.zip.Deflater;
- import java.util.zip.InflaterInputStream;
- import java.util.zip.DeflaterOutputStream;
- import java.util.zip.ZipException;
- import java.util.zip.ZipError;
- import static java.lang.Boolean.*;
- import static com.sun.nio.zipfs.ZipConstants.*;
- import static com.sun.nio.zipfs.ZipUtils.*;
- import static java.nio.file.StandardOpenOption.*;
- import static java.nio.file.StandardCopyOption.*;
- /**
- * A FileSystem built on a zip file
- *
- * @author Xueming Shen
- */
- public class ZipFileSystem extends FileSystem {
- private final ZipFileSystemProvider provider;
- private final ZipPath defaultdir;
- private boolean readOnly = false;
- private final Path zfpath;
- private final ZipCoder zc;
- // configurable by env map
- private final String defaultDir; // default dir for the file system
- private final String nameEncoding; // default encoding for name/comment
- private final boolean useTempFile; // use a temp file for newOS, default
- // is to use BAOS for better performance
- private final boolean createNew; // create a new zip if not exists
- private static final boolean isWindows =
- System.getProperty("os.name").startsWith("Windows");
- ZipFileSystem(ZipFileSystemProvider provider,
- Path zfpath,
- Map<String, ?> env)
- throws IOException
- {
- // configurable env setup
- this.createNew = "true".equals(env.get("create"));
- this.nameEncoding = env.containsKey("encoding") ?
- (String)env.get("encoding") : "UTF-8";
- this.useTempFile = TRUE.equals(env.get("useTempFile"));
- this.defaultDir = env.containsKey("default.dir") ?
- (String)env.get("default.dir") : "/";
- if (this.defaultDir.charAt(0) != '/')
- throw new IllegalArgumentException("default dir should be absolute");
- this.provider = provider;
- this.zfpath = zfpath;
- if (Files.notExists(zfpath)) {
- if (createNew) {
- try (OutputStream os = Files.newOutputStream(zfpath, CREATE_NEW, WRITE)) {
- new END().write(os, 0);
- }
- } else {
- throw new FileSystemNotFoundException(zfpath.toString());
- }
- }
- // sm and existence check
- zfpath.getFileSystem().provider().checkAccess(zfpath, AccessMode.READ);
- if (!Files.isWritable(zfpath))
- this.readOnly = true;
- this.zc = ZipCoder.get(nameEncoding);
- this.defaultdir = new ZipPath(this, getBytes(defaultDir));
- this.ch = Files.newByteChannel(zfpath, READ);
- this.cen = initCEN();
- }
- @Override
- public FileSystemProvider provider() {
- return provider;
- }
- @Override
- public String getSeparator() {
- return "/";
- }
- @Override
- public boolean isOpen() {
- return isOpen;
- }
- @Override
- public boolean isReadOnly() {
- return readOnly;
- }
- private void checkWritable() throws IOException {
- if (readOnly)
- throw new ReadOnlyFileSystemException();
- }
- @Override
- public Iterable<Path> getRootDirectories() {
- ArrayList<Path> pathArr = new ArrayList<>();
- pathArr.add(new ZipPath(this, new byte[]{'/'}));
- return pathArr;
- }
- ZipPath getDefaultDir() { // package private
- return defaultdir;
- }
- @Override
- public ZipPath getPath(String first, String... more) {
- String path;
- if (more.length == 0) {
- path = first;
- } else {
- StringBuilder sb = new StringBuilder();
- sb.append(first);
- for (String segment: more) {
- if (segment.length() > 0) {
- if (sb.length() > 0)
- sb.append('/');
- sb.append(segment);
- }
- }
- path = sb.toString();
- }
- return new ZipPath(this, getBytes(path));
- }
- @Override
- public UserPrincipalLookupService getUserPrincipalLookupService() {
- throw new UnsupportedOperationException();
- }
- @Override
- public WatchService newWatchService() {
- throw new UnsupportedOperationException();
- }
- FileStore getFileStore(ZipPath path) {
- return new ZipFileStore(path);
- }
- @Override
- public Iterable<FileStore> getFileStores() {
- ArrayList<FileStore> list = new ArrayList<>(1);
- list.add(new ZipFileStore(new ZipPath(this, new byte[]{'/'})));
- return list;
- }
- private static final Set<String> supportedFileAttributeViews =
- Collections.unmodifiableSet(
- new HashSet<String>(Arrays.asList("basic", "zip")));
- @Override
- public Set<String> supportedFileAttributeViews() {
- return supportedFileAttributeViews;
- }
- @Override
- public String toString() {
- return zfpath.toString();
- }
- Path getZipFile() {
- return zfpath;
- }
- private static final String GLOB_SYNTAX = "glob";
- private static final String REGEX_SYNTAX = "regex";
- @Override
- public PathMatcher getPathMatcher(String syntaxAndInput) {
- int pos = syntaxAndInput.indexOf(':');
- if (pos <= 0 || pos == syntaxAndInput.length()) {
- throw new IllegalArgumentException();
- }
- String syntax = syntaxAndInput.substring(0, pos);
- String input = syntaxAndInput.substring(pos + 1);
- String expr;
- if (syntax.equals(GLOB_SYNTAX)) {
- expr = toRegexPattern(input);
- } else {
- if (syntax.equals(REGEX_SYNTAX)) {
- expr = input;
- } else {
- throw new UnsupportedOperationException("Syntax '" + syntax +
- "' not recognized");
- }
- }
- // return matcher
- final Pattern pattern = Pattern.compile(expr);
- return new PathMatcher() {
- @Override
- public boolean matches(Path path) {
- return pattern.matcher(path.toString()).matches();
- }
- };
- }
- @Override
- public void close() throws IOException {
- beginWrite();
- try {
- if (!isOpen)
- return;
- isOpen = false; // set closed
- } finally {
- endWrite();
- }
- if (!streams.isEmpty()) { // unlock and close all remaining streams
- Set<InputStream> copy = new HashSet<>(streams);
- for (InputStream is: copy)
- is.close();
- }
- beginWrite(); // lock and sync
- try {
- sync();
- ch.close(); // close the ch just in case no update
- } finally { // and sync dose not close the ch
- endWrite();
- }
- synchronized (inflaters) {
- for (Inflater inf : inflaters)
- inf.end();
- }
- synchronized (deflaters) {
- for (Deflater def : deflaters)
- def.end();
- }
- IOException ioe = null;
- synchronized (tmppaths) {
- for (Path p: tmppaths) {
- try {
- Files.deleteIfExists(p);
- } catch (IOException x) {
- if (ioe == null)
- ioe = x;
- else
- ioe.addSuppressed(x);
- }
- }
- }
- provider.removeFileSystem(zfpath, this);
- if (ioe != null)
- throw ioe;
- }
- ZipFileAttributes getFileAttributes(byte[] path)
- throws IOException
- {
- Entry e;
- beginRead();
- try {
- ensureOpen();
- e = getEntry0(path);
- if (e == null) {
- IndexNode inode = getInode(path);
- if (inode == null)
- return null;
- e = new Entry(inode.name); // pseudo directory
- e.method = METHOD_STORED; // STORED for dir
- e.mtime = e.atime = e.ctime = -1;// -1 for all times
- }
- } finally {
- endRead();
- }
- return new ZipFileAttributes(e);
- }
- void setTimes(byte[] path, FileTime mtime, FileTime atime, FileTime ctime)
- throws IOException
- {
- checkWritable();
- beginWrite();
- try {
- ensureOpen();
- Entry e = getEntry0(path); // ensureOpen checked
- if (e == null)
- throw new NoSuchFileException(getString(path));
- if (e.type == Entry.CEN)
- e.type = Entry.COPY; // copy e
- if (mtime != null)
- e.mtime = mtime.toMillis();
- if (atime != null)
- e.atime = atime.toMillis();
- if (ctime != null)
- e.ctime = ctime.toMillis();
- update(e);
- } finally {
- endWrite();
- }
- }
- boolean exists(byte[] path)
- throws IOException
- {
- beginRead();
- try {
- ensureOpen();
- return getInode(path) != null;
- } finally {
- endRead();
- }
- }
- boolean isDirectory(byte[] path)
- throws IOException
- {
- beginRead();
- try {
- IndexNode n = getInode(path);
- return n != null && n.isDir();
- } finally {
- endRead();
- }
- }
- private ZipPath toZipPath(byte[] path) {
- // make it absolute
- byte[] p = new byte[path.length + 1];
- p[0] = '/';
- System.arraycopy(path, 0, p, 1, path.length);
- return new ZipPath(this, p);
- }
- // returns the list of child paths of "path"
- Iterator<Path> iteratorOf(byte[] path,
- DirectoryStream.Filter<? super Path> filter)
- throws IOException
- {
- beginWrite(); // iteration of inodes needs exclusive lock
- try {
- ensureOpen();
- IndexNode inode = getInode(path);
- if (inode == null)
- throw new NotDirectoryException(getString(path));
- List<Path> list = new ArrayList<>();
- IndexNode child = inode.child;
- while (child != null) {
- ZipPath zp = toZipPath(child.name);
- if (filter == null || filter.accept(zp))
- list.add(zp);
- child = child.sibling;
- }
- return list.iterator();
- } finally {
- endWrite();
- }
- }
- void createDirectory(byte[] dir, FileAttribute<?>... attrs)
- throws IOException
- {
- checkWritable();
- dir = toDirectoryPath(dir);
- beginWrite();
- try {
- ensureOpen();
- if (dir.length == 0 || exists(dir)) // root dir, or exiting dir
- throw new FileAlreadyExistsException(getString(dir));
- checkParents(dir);
- Entry e = new Entry(dir, Entry.NEW);
- e.method = METHOD_STORED; // STORED for dir
- update(e);
- } finally {
- endWrite();
- }
- }
- void copyFile(boolean deletesrc, byte[]src, byte[] dst, CopyOption... options)
- throws IOException
- {
- checkWritable();
- if (Arrays.equals(src, dst))
- return; // do nothing, src and dst are the same
- beginWrite();
- try {
- ensureOpen();
- Entry eSrc = getEntry0(src); // ensureOpen checked
- if (eSrc == null)
- throw new NoSuchFileException(getString(src));
- if (eSrc.isDir()) { // spec says to create dst dir
- createDirectory(dst);
- return;
- }
- boolean hasReplace = false;
- boolean hasCopyAttrs = false;
- for (CopyOption opt : options) {
- if (opt == REPLACE_EXISTING)
- hasReplace = true;
- else if (opt == COPY_ATTRIBUTES)
- hasCopyAttrs = true;
- }
- Entry eDst = getEntry0(dst);
- if (eDst != null) {
- if (!hasReplace)
- throw new FileAlreadyExistsException(getString(dst));
- } else {
- checkParents(dst);
- }
- Entry u = new Entry(eSrc, Entry.COPY); // copy eSrc entry
- u.name(dst); // change name
- if (eSrc.type == Entry.NEW || eSrc.type == Entry.FILECH)
- {
- u.type = eSrc.type; // make it the same type
- if (!deletesrc) { // if it's not "rename", just take the data
- if (eSrc.bytes != null)
- u.bytes = Arrays.copyOf(eSrc.bytes, eSrc.bytes.length);
- else if (eSrc.file != null) {
- u.file = getTempPathForEntry(null);
- Files.copy(eSrc.file, u.file, REPLACE_EXISTING);
- }
- }
- }
- if (!hasCopyAttrs)
- u.mtime = u.atime= u.ctime = System.currentTimeMillis();
- update(u);
- if (deletesrc)
- updateDelete(eSrc);
- } finally {
- endWrite();
- }
- }
- // Returns an output stream for writing the contents into the specified
- // entry.
- OutputStream newOutputStream(byte[] path, OpenOption... options)
- throws IOException
- {
- checkWritable();
- boolean hasCreateNew = false;
- boolean hasCreate = false;
- boolean hasAppend = false;
- for (OpenOption opt: options) {
- if (opt == READ)
- throw new IllegalArgumentException("READ not allowed");
- if (opt == CREATE_NEW)
- hasCreateNew = true;
- if (opt == CREATE)
- hasCreate = true;
- if (opt == APPEND)
- hasAppend = true;
- }
- beginRead(); // only need a readlock, the "update()" will
- try { // try to obtain a writelock when the os is
- ensureOpen(); // being closed.
- Entry e = getEntry0(path);
- if (e != null) {
- if (e.isDir() || hasCreateNew)
- throw new FileAlreadyExistsException(getString(path));
- if (hasAppend) {
- InputStream is = getInputStream(e);
- OutputStream os = getOutputStream(new Entry(e, Entry.NEW));
- copyStream(is, os);
- is.close();
- return os;
- }
- return getOutputStream(new Entry(e, Entry.NEW));
- } else {
- if (!hasCreate && !hasCreateNew)
- throw new NoSuchFileException(getString(path));
- checkParents(path);
- return getOutputStream(new Entry(path, Entry.NEW));
- }
- } finally {
- endRead();
- }
- }
- // Returns an input stream for reading the contents of the specified
- // file entry.
- InputStream newInputStream(byte[] path) throws IOException {
- beginRead();
- try {
- ensureOpen();
- Entry e = getEntry0(path);
- if (e == null)
- throw new NoSuchFileException(getString(path));
- if (e.isDir())
- throw new FileSystemException(getString(path), "is a directory", null);
- return getInputStream(e);
- } finally {
- endRead();
- }
- }
- private void checkOptions(Set<? extends OpenOption> options) {
- // check for options of null type and option is an intance of StandardOpenOption
- for (OpenOption option : options) {
- if (option == null)
- throw new NullPointerException();
- if (!(option instanceof StandardOpenOption))
- throw new IllegalArgumentException();
- }
- }
- // Returns a Writable/ReadByteChannel for now. Might consdier to use
- // newFileChannel() instead, which dump the entry data into a regular
- // file on the default file system and create a FileChannel on top of
- // it.
- SeekableByteChannel newByteChannel(byte[] path,
- Set<? extends OpenOption> options,
- FileAttribute<?>... attrs)
- throws IOException
- {
- checkOptions(options);
- if (options.contains(StandardOpenOption.WRITE) ||
- options.contains(StandardOpenOption.APPEND)) {
- checkWritable();
- beginRead();
- try {
- final WritableByteChannel wbc = Channels.newChannel(
- newOutputStream(path, options.toArray(new OpenOption[0])));
- long leftover = 0;
- if (options.contains(StandardOpenOption.APPEND)) {
- Entry e = getEntry0(path);
- if (e != null && e.size >= 0)
- leftover = e.size;
- }
- final long offset = leftover;
- return new SeekableByteChannel() {
- long written = offset;
- public boolean isOpen() {
- return wbc.isOpen();
- }
- public long position() throws IOException {
- return written;
- }
- public SeekableByteChannel position(long pos)
- throws IOException
- {
- throw new UnsupportedOperationException();
- }
- public int read(ByteBuffer dst) throws IOException {
- throw new UnsupportedOperationException();
- }
- public SeekableByteChannel truncate(long size)
- throws IOException
- {
- throw new UnsupportedOperationException();
- }
- public int write(ByteBuffer src) throws IOException {
- int n = wbc.write(src);
- written += n;
- return n;
- }
- public long size() throws IOException {
- return written;
- }
- public void close() throws IOException {
- wbc.close();
- }
- };
- } finally {
- endRead();
- }
- } else {
- beginRead();
- try {
- ensureOpen();
- Entry e = getEntry0(path);
- if (e == null || e.isDir())
- throw new NoSuchFileException(getString(path));
- final ReadableByteChannel rbc =
- Channels.newChannel(getInputStream(e));
- final long size = e.size;
- return new SeekableByteChannel() {
- long read = 0;
- public boolean isOpen() {
- return rbc.isOpen();
- }
- public long position() throws IOException {
- return read;
- }
- public SeekableByteChannel position(long pos)
- throws IOException
- {
- throw new UnsupportedOperationException();
- }
- public int read(ByteBuffer dst) throws IOException {
- int n = rbc.read(dst);
- if (n > 0) {
- read += n;
- }
- return n;
- }
- public SeekableByteChannel truncate(long size)
- throws IOException
- {
- throw new NonWritableChannelException();
- }
- public int write (ByteBuffer src) throws IOException {
- throw new NonWritableChannelException();
- }
- public long size() throws IOException {
- return size;
- }
- public void close() throws IOException {
- rbc.close();
- }
- };
- } finally {
- endRead();
- }
- }
- }
- // Returns a FileChannel of the specified entry.
- //
- // This implementation creates a temporary file on the default file system,
- // copy the entry data into it if the entry exists, and then create a
- // FileChannel on top of it.
- FileChannel newFileChannel(byte[] path,
- Set<? extends OpenOption> options,
- FileAttribute<?>... attrs)
- throws IOException
- {
- checkOptions(options);
- final boolean forWrite = (options.contains(StandardOpenOption.WRITE) ||
- options.contains(StandardOpenOption.APPEND));
- beginRead();
- try {
- ensureOpen();
- Entry e = getEntry0(path);
- if (forWrite) {
- checkWritable();
- if (e == null) {
- if (!options.contains(StandardOpenOption.CREATE_NEW))
- throw new NoSuchFileException(getString(path));
- } else {
- if (options.contains(StandardOpenOption.CREATE_NEW))
- throw new FileAlreadyExistsException(getString(path));
- if (e.isDir())
- throw new FileAlreadyExistsException("directory <"
- + getString(path) + "> exists");
- }
- options.remove(StandardOpenOption.CREATE_NEW); // for tmpfile
- } else if (e == null || e.isDir()) {
- throw new NoSuchFileException(getString(path));
- }
- final boolean isFCH = (e != null && e.type == Entry.FILECH);
- final Path tmpfile = isFCH ? e.file : getTempPathForEntry(path);
- final FileChannel fch = tmpfile.getFileSystem()
- .provider()
- .newFileChannel(tmpfile, options, attrs);
- final Entry u = isFCH ? e : new Entry(path, tmpfile, Entry.FILECH);
- if (forWrite) {
- u.flag = FLAG_DATADESCR;
- u.method = METHOD_DEFLATED;
- }
- // is there a better way to hook into the FileChannel's close method?
- return new FileChannel() {
- public int write(ByteBuffer src) throws IOException {
- return fch.write(src);
- }
- public long write(ByteBuffer[] srcs, int offset, int length)
- throws IOException
- {
- return fch.write(srcs, offset, length);
- }
- public long position() throws IOException {
- return fch.position();
- }
- public FileChannel position(long newPosition)
- throws IOException
- {
- fch.position(newPosition);
- return this;
- }
- public long size() throws IOException {
- return fch.size();
- }
- public FileChannel truncate(long size)
- throws IOException
- {
- fch.truncate(size);
- return this;
- }
- public void force(boolean metaData)
- throws IOException
- {
- fch.force(metaData);
- }
- public long transferTo(long position, long count,
- WritableByteChannel target)
- throws IOException
- {
- return fch.transferTo(position, count, target);
- }
- public long transferFrom(ReadableByteChannel src,
- long position, long count)
- throws IOException
- {
- return fch.transferFrom(src, position, count);
- }
- public int read(ByteBuffer dst) throws IOException {
- return fch.read(dst);
- }
- public int read(ByteBuffer dst, long position)
- throws IOException
- {
- return fch.read(dst, position);
- }
- public long read(ByteBuffer[] dsts, int offset, int length)
- throws IOException
- {
- return fch.read(dsts, offset, length);
- }
- public int write(ByteBuffer src, long position)
- throws IOException
- {
- return fch.write(src, position);
- }
- public MappedByteBuffer map(MapMode mode,
- long position, long size)
- throws IOException
- {
- throw new UnsupportedOperationException();
- }
- public FileLock lock(long position, long size, boolean shared)
- throws IOException
- {
- return fch.lock(position, size, shared);
- }
- public FileLock tryLock(long position, long size, boolean shared)
- throws IOException
- {
- return fch.tryLock(position, size, shared);
- }
- protected void implCloseChannel() throws IOException {
- fch.close();
- if (forWrite) {
- u.mtime = System.currentTimeMillis();
- u.size = Files.size(u.file);
- update(u);
- } else {
- if (!isFCH) // if this is a new fch for reading
- removeTempPathForEntry(tmpfile);
- }
- }
- };
- } finally {
- endRead();
- }
- }
- // the outstanding input streams that need to be closed
- private Set<InputStream> streams =
- Collections.synchronizedSet(new HashSet<InputStream>());
- // the ex-channel and ex-path that need to close when their outstanding
- // input streams are all closed by the obtainers.
- private Set<ExChannelCloser> exChClosers = new HashSet<>();
- private Set<Path> tmppaths = Collections.synchronizedSet(new HashSet<Path>());
- private Path getTempPathForEntry(byte[] path) throws IOException {
- Path tmpPath = createTempFileInSameDirectoryAs(zfpath);
- if (path != null) {
- Entry e = getEntry0(path);
- if (e != null) {
- try (InputStream is = newInputStream(path)) {
- Files.copy(is, tmpPath, REPLACE_EXISTING);
- }
- }
- }
- return tmpPath;
- }
- private void removeTempPathForEntry(Path path) throws IOException {
- Files.delete(path);
- tmppaths.remove(path);
- }
- // check if all parents really exit. ZIP spec does not require
- // the existence of any "parent directory".
- private void checkParents(byte[] path) throws IOException {
- beginRead();
- try {
- while ((path = getParent(path)) != null && path.length != 0) {
- if (!inodes.containsKey(IndexNode.keyOf(path))) {
- throw new NoSuchFileException(getString(path));
- }
- }
- } finally {
- endRead();
- }
- }
- private static byte[] ROOTPATH = new byte[0];
- private static byte[] getParent(byte[] path) {
- int off = path.length - 1;
- if (off > 0 && path[off] == '/') // isDirectory
- off--;
- while (off > 0 && path[off] != '/') { off--; }
- if (off <= 0)
- return ROOTPATH;
- return Arrays.copyOf(path, off + 1);
- }
- private final void beginWrite() {
- rwlock.writeLock().lock();
- }
- private final void endWrite() {
- rwlock.writeLock().unlock();
- }
- private final void beginRead() {
- rwlock.readLock().lock();
- }
- private final void endRead() {
- rwlock.readLock().unlock();
- }
- ///////////////////////////////////////////////////////////////////
- private volatile boolean isOpen = true;
- private final SeekableByteChannel ch; // channel to the zipfile
- final byte[] cen; // CEN & ENDHDR
- private END end;
- private long locpos; // position of first LOC header (usually 0)
- private final ReadWriteLock rwlock = new ReentrantReadWriteLock();
- // name -> pos (in cen), IndexNode itself can be used as a "key"
- private LinkedHashMap<IndexNode, IndexNode> inodes;
- final byte[] getBytes(String name) {
- return zc.getBytes(name);
- }
- final String getString(byte[] name) {
- return zc.toString(name);
- }
- protected void finalize() throws IOException {
- close();
- }
- private long getDataPos(Entry e) throws IOException {
- if (e.locoff == -1) {
- Entry e2 = getEntry0(e.name);
- if (e2 == null)
- throw new ZipException("invalid loc for entry <" + e.name + ">");
- e.locoff = e2.locoff;
- }
- byte[] buf = new byte[LOCHDR];
- if (readFullyAt(buf, 0, buf.length, e.locoff) != buf.length)
- throw new ZipException("invalid loc for entry <" + e.name + ">");
- return locpos + e.locoff + LOCHDR + LOCNAM(buf) + LOCEXT(buf);
- }
- // Reads len bytes of data from the specified offset into buf.
- // Returns the total number of bytes read.
- // Each/every byte read from here (except the cen, which is mapped).
- final long readFullyAt(byte[] buf, int off, long len, long pos)
- throws IOException
- {
- ByteBuffer bb = ByteBuffer.wrap(buf);
- bb.position(off);
- bb.limit((int)(off + len));
- return readFullyAt(bb, pos);
- }
- private final long readFullyAt(ByteBuffer bb, long pos)
- throws IOException
- {
- synchronized(ch) {
- return ch.position(pos).read(bb);
- }
- }
- // Searches for end of central directory (END) header. The contents of
- // the END header will be read and placed in endbuf. Returns the file
- // position of the END header, otherwise returns -1 if the END header
- // was not found or an error occurred.
- private END findEND() throws IOException
- {
- byte[] buf = new byte[READBLOCKSZ];
- long ziplen = ch.size();
- long minHDR = (ziplen - END_MAXLEN) > 0 ? ziplen - END_MAXLEN : 0;
- long minPos = minHDR - (buf.length - ENDHDR);
- for (long pos = ziplen - buf.length; pos >= minPos; pos -= (buf.length - ENDHDR))
- {
- int off = 0;
- if (pos < 0) {
- // Pretend there are some NUL bytes before start of file
- off = (int)-pos;
- Arrays.fill(buf, 0, off, (byte)0);
- }
- int len = buf.length - off;
- if (readFullyAt(buf, off, len, pos + off) != len)
- zerror("zip END header not found");
- // Now scan the block backwards for END header signature
- for (int i = buf.length - ENDHDR; i >= 0; i--) {
- if (buf[i+0] == (byte)'P' &&
- buf[i+1] == (byte)'K' &&
- buf[i+2] == (byte)'\005' &&
- buf[i+3] == (byte)'\006' &&
- (pos + i + ENDHDR + ENDCOM(buf, i) == ziplen)) {
- // Found END header
- buf = Arrays.copyOfRange(buf, i, i + ENDHDR);
- END end = new END();
- end.endsub = ENDSUB(buf);
- end.centot = ENDTOT(buf);
- end.cenlen = ENDSIZ(buf);
- end.cenoff = ENDOFF(buf);
- end.comlen = ENDCOM(buf);
- end.endpos = pos + i;
- if (end.cenlen == ZIP64_MINVAL ||
- end.cenoff == ZIP64_MINVAL ||
- end.centot == ZIP64_MINVAL32)
- {
- // need to find the zip64 end;
- byte[] loc64 = new byte[ZIP64_LOCHDR];
- if (readFullyAt(loc64, 0, loc64.length, end.endpos - ZIP64_LOCHDR)
- != loc64.length) {
- return end;
- }
- long end64pos = ZIP64_LOCOFF(loc64);
- byte[] end64buf = new byte[ZIP64_ENDHDR];
- if (readFullyAt(end64buf, 0, end64buf.length, end64pos)
- != end64buf.length) {
- return end;
- }
- // end64 found, re-calcualte everything.
- end.cenlen = ZIP64_ENDSIZ(end64buf);
- end.cenoff = ZIP64_ENDOFF(end64buf);
- end.centot = (int)ZIP64_ENDTOT(end64buf); // assume total < 2g
- end.endpos = end64pos;
- }
- return end;
- }
- }
- }
- zerror("zip END header not found");
- return null; //make compiler happy
- }
- // Reads zip file central directory. Returns the file position of first
- // CEN header, otherwise returns -1 if an error occured. If zip->msg != NULL
- // then the error was a zip format error and zip->msg has the error text.
- // Always pass in -1 for knownTotal; it's used for a recursive call.
- private byte[] initCEN() throws IOException {
- end = findEND();
- if (end.endpos == 0) {
- inodes = new LinkedHashMap<>(10);
- locpos = 0;
- buildNodeTree();
- return null; // only END header present
- }
- if (end.cenlen > end.endpos)
- zerror("invalid END header (bad central directory size)");
- long cenpos = end.endpos - end.cenlen; // position of CEN table
- // Get position of first local file (LOC) header, taking into
- // account that there may be a stub prefixed to the zip file.
- locpos = cenpos - end.cenoff;
- if (locpos < 0)
- zerror("invalid END header (bad central directory offset)");
- // read in the CEN and END
- byte[] cen = new byte[(int)(end.cenlen + ENDHDR)];
- if (readFullyAt(cen, 0, cen.length, cenpos) != end.cenlen + ENDHDR) {
- zerror("read CEN tables failed");
- }
- // Iterate through the entries in the central directory
- inodes = new LinkedHashMap<>(end.centot + 1);
- int pos = 0;
- int limit = cen.length - ENDHDR;
- while (pos < limit) {
- if (CENSIG(cen, pos) != CENSIG)
- zerror("invalid CEN header (bad signature)");
- int method = CENHOW(cen, pos);
- int nlen = CENNAM(cen, pos);
- int elen = CENEXT(cen, pos);
- int clen = CENCOM(cen, pos);
- if ((CENFLG(cen, pos) & 1) != 0)
- zerror("invalid CEN header (encrypted entry)");
- if (method != METHOD_STORED && method != METHOD_DEFLATED)
- zerror("invalid CEN header (unsupported compression method: " + method + ")");
- if (pos + CENHDR + nlen > limit)
- zerror("invalid CEN header (bad header size)");
- byte[] name = Arrays.copyOfRange(cen, pos + CENHDR, pos + CENHDR + nlen);
- IndexNode inode = new IndexNode(name, pos);
- inodes.put(inode, inode);
- // skip ext and comment
- pos += (CENHDR + nlen + elen + clen);
- }
- if (pos + ENDHDR != cen.length) {
- zerror("invalid CEN header (bad header size)");
- }
- buildNodeTree();
- return cen;
- }
- private void ensureOpen() throws IOException {
- if (!isOpen)
- throw new ClosedFileSystemException();
- }
- // Creates a new empty temporary file in the same directory as the
- // specified file. A variant of File.createTempFile.
- private Path createTempFileInSameDirectoryAs(Path path)
- throws IOException
- {
- Path parent = path.toAbsolutePath().getParent();
- String dir = (parent == null)? "." : parent.toString();
- Path tmpPath = File.createTempFile("zipfstmp", null, new File(dir)).toPath();
- tmppaths.add(tmpPath);
- return tmpPath;
- }
- ////////////////////update & sync //////////////////////////////////////
- private boolean hasUpdate = false;
- // shared key. consumer guarantees the "writeLock" before use it.
- private final IndexNode LOOKUPKEY = IndexNode.keyOf(null);
- private void updateDelete(IndexNode inode) {
- beginWrite();
- try {
- removeFromTree(inode);
- inodes.remove(inode);
- hasUpdate = true;
- } finally {
- endWrite();
- }
- }
- private void update(Entry e) {
- beginWrite();
- try {
- IndexNode old = inodes.put(e, e);
- if (old != null) {
- removeFromTree(old);
- }
- if (e.type == Entry.NEW || e.type == Entry.FILECH) {
- IndexNode parent = inodes.get(LOOKUPKEY.as(getParent(e.name)));
- e.sibling = parent.child;
- parent.child = e;
- }
- hasUpdate = true;
- } finally {
- endWrite();
- }
- }
- // copy over the whole LOC entry (header if necessary, data and ext) from
- // old zip to the new one.
- private long copyLOCEntry(Entry e, boolean updateHeader,
- OutputStream os,
- long written, byte[] buf)
- throws IOException
- {
- long locoff = e.locoff; // where to read
- e.locoff = written; // update the e.locoff with new value
- // calculate the size need to write out
- long size = 0;
- // if there is A ext
- if ((e.flag & FLAG_DATADESCR) != 0) {
- if (e.size >= ZIP64_MINVAL || e.csize >= ZIP64_MINVAL)
- size = 24;
- else
- size = 16;
- }
- // read loc, use the original loc.elen/nlen
- if (readFullyAt(buf, 0, LOCHDR , locoff) != LOCHDR)
- throw new ZipException("loc: reading failed");
- if (updateHeader) {
- locoff += LOCHDR + LOCNAM(buf) + LOCEXT(buf); // skip header
- size += e.csize;
- written = e.writeLOC(os) + size;
- } else {
- os.write(buf, 0, LOCHDR); // write out the loc header
- locoff += LOCHDR;
- // use e.csize, LOCSIZ(buf) is zero if FLAG_DATADESCR is on
- // size += LOCNAM(buf) + LOCEXT(buf) + LOCSIZ(buf);
- size += LOCNAM(buf) + LOCEXT(buf) + e.csize;
- written = LOCHDR + size;
- }
- int n;
- while (size > 0 &&
- (n = (int)readFullyAt(buf, 0, buf.length, locoff)) != -1)
- {
- if (size < n)
- n = (int)size;
- os.write(buf, 0, n);
- size -= n;
- locoff += n;
- }
- return written;
- }
- // sync the zip file system, if there is any udpate
- private void sync() throws IOException {
- //System.out.printf("->sync(%s) starting....!%n", toString());
- // check ex-closer
- if (!exChClosers.isEmpty()) {
- for (ExChannelCloser ecc : exChClosers) {
- if (ecc.streams.isEmpty()) {
- ecc.ch.close();
- Files.delete(ecc.path);
- exChClosers.remove(ecc);
- }
- }
- }
- if (!hasUpdate)
- return;
- Path tmpFile = createTempFileInSameDirectoryAs(zfpath);
- try (OutputStream os = new BufferedOutputStream(Files.newOutputStream(tmpFile, WRITE)))
- {
- ArrayList<Entry> elist = new ArrayList<>(inodes.size());
- long written = 0;
- byte[] buf = new byte[8192];
- Entry e = null;
- // write loc
- for (IndexNode inode : inodes.values()) {
- if (inode instanceof Entry) { // an updated inode
- e = (Entry)inode;
- try {
- if (e.type == Entry.COPY) {
- // entry copy: the only thing changed is the "name"
- // and "nlen" in LOC header, so we udpate/rewrite the
- // LOC in new file and simply copy the rest (data and
- // ext) without enflating/deflating from the old zip
- // file LOC entry.
- written += copyLOCEntry(e, true, os, written, buf);
- } else { // NEW, FILECH or CEN
- e.locoff = written;
- written += e.writeLOC(os); // write loc header
- if (e.bytes != null) { // in-memory, deflated
- os.write(e.bytes); // already
- written += e.bytes.length;
- } else if (e.file != null) { // tmp file
- try (InputStream is = Files.newInputStream(e.file)) {
- int n;
- if (e.type == Entry.NEW) { // deflated already
- while ((n = is.read(buf)) != -1) {
- os.write(buf, 0, n);
- written += n;
- }
- } else if (e.type == Entry.FILECH) {
- // the data are not deflated, use ZEOS
- try (OutputStream os2 = new EntryOutputStream(e, os)) {
- while ((n = is.read(buf)) != -1) {
- os2.write(buf, 0, n);
- }
- }
- written += e.csize;
- if ((e.flag & FLAG_DATADESCR) != 0)
- written += e.writeEXT(os);
- }
- }
- Files.delete(e.file);
- tmppaths.remove(e.file);
- } else {
- // dir, 0-length data
- }
- }
- elist.add(e);
- } catch (IOException x) {
- x.printStackTrace(); // skip any in-accurate entry
- }
- } else { // unchanged inode
- if (inode.pos == -1) {
- continue; // pseudo directory node
- }
- e = Entry.readCEN(this, inode.pos);
- try {
- written += copyLOCEntry(e, false, os, written, buf);
- elist.add(e);
- } catch (IOException x) {
- x.printStackTrace(); // skip any wrong entry
- }
- }
- }
- // now write back the cen and end table
- end.cenoff = written;
- for (Entry entry : elist) {
- written += entry.writeCEN(os);
- }
- end.centot = elist.size();
- end.cenlen = written - end.cenoff;
- end.write(os, written);
- }
- if (!streams.isEmpty()) {
- //
- // TBD: ExChannelCloser should not be necessary if we only
- // sync when being closed, all streams should have been
- // closed already. Keep the logic here for now.
- //
- // There are outstanding input streams open on existing "ch",
- // so, don't close the "cha" and delete the "file for now, let
- // the "ex-channel-closer" to handle them
- ExChannelCloser ecc = new ExChannelCloser(
- createTempFileInSameDirectoryAs(zfpath),
- ch,
- streams);
- Files.move(zfpath, ecc.path, REPLACE_EXISTING);
- exChClosers.add(ecc);
- streams = Collections.synchronizedSet(new HashSet<InputStream>());
- } else {
- ch.close();
- Files.delete(zfpath);
- }
- Files.move(tmpFile, zfpath, REPLACE_EXISTING);
- hasUpdate = false; // clear
- /*
- if (isOpen) {
- ch = zfpath.newByteChannel(READ); // re-fresh "ch" and "cen"
- cen = initCEN();
- }
- */
- //System.out.printf("->sync(%s) done!%n", toString());
- }
- private IndexNode getInode(byte[] path) {
- if (path == null)
- throw new NullPointerException("path");
- IndexNode key = IndexNode.keyOf(path);
- IndexNode inode = inodes.get(key);
- if (inode == null &&
- (path.length == 0 || path[path.length -1] != '/')) {
- // if does not ends with a slash
- path = Arrays.copyOf(path, path.length + 1);
- path[path.length - 1] = '/';
- inode = inodes.get(key.as(path));
- }
- return inode;
- }
- private Entry getEntry0(byte[] path) throws IOException {
- IndexNode inode = getInode(path);
- if (inode instanceof Entry)
- return (Entry)inode;
- if (inode == null || inode.pos == -1)
- return null;
- return Entry.readCEN(this, inode.pos);
- }
- public void deleteFile(byte[] path, boolean failIfNotExists)
- throws IOException
- {
- checkWritable();
- IndexNode inode = getInode(path);
- if (inode == null) {
- if (path != null && path.length == 0)
- throw new ZipException("root directory </> can't not be delete");
- if (failIfNotExists)
- throw new NoSuchFileException(getString(path));
- } else {
- if (inode.isDir() && inode.child != null)
- throw new DirectoryNotEmptyException(getString(path));
- updateDelete(inode);
- }
- }
- private static void copyStream(InputStream is, OutputStream os)
- throws IOException
- {
- byte[] copyBuf = new byte[8192];
- in…
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