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	/*
	* Copyright (c) 1995, 2017, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	package java.util.zip;

	import java.io.Closeable;
	import java.io.InputStream;
	import java.io.IOException;
	import java.io.EOFException;
	import java.io.File;
	import java.io.RandomAccessFile;
	import java.io.UncheckedIOException;
	import java.lang.ref.Cleaner.Cleanable;
	import java.nio.charset.Charset;
	import java.nio.charset.StandardCharsets;
	import java.nio.file.attribute.BasicFileAttributes;
	import java.nio.file.Files;
	import java.util.ArrayDeque;
	import java.util.ArrayList;
	import java.util.Arrays;
	import java.util.Collections;
	import java.util.Deque;
	import java.util.Enumeration;
	import java.util.HashMap;
	import java.util.Iterator;
	import java.util.Objects;
	import java.util.NoSuchElementException;
	import java.util.Set;
	import java.util.Spliterator;
	import java.util.Spliterators;
	import java.util.WeakHashMap;
	import java.util.function.Consumer;
	import java.util.function.Function;
	import java.util.function.IntFunction;
	import java.util.jar.JarEntry;
	import java.util.jar.JarFile;
	import java.util.stream.Stream;
	import java.util.stream.StreamSupport;
	import jdk.internal.misc.JavaLangAccess;
	import jdk.internal.misc.JavaUtilZipFileAccess;
	import jdk.internal.misc.SharedSecrets;
	import jdk.internal.misc.VM;
	import jdk.internal.perf.PerfCounter;
	import jdk.internal.ref.CleanerFactory;
	import jdk.internal.vm.annotation.Stable;

	import static java.util.zip.ZipConstants64.*;
	import static java.util.zip.ZipUtils.*;

	/**
	* This class is used to read entries from a zip file.
	*
	* <p> Unless otherwise noted, passing a {@code null} argument to a constructor
	* or method in this class will cause a {@link NullPointerException} to be
	* thrown.
	*
	* @apiNote
	* To release resources used by this {@code ZipFile}, the {@link #close()} method
	* should be called explicitly or by try-with-resources. Subclasses are responsible
	* for the cleanup of resources acquired by the subclass. Subclasses that override
	* {@link #finalize()} in order to perform cleanup should be modified to use alternative
	* cleanup mechanisms such as {@link java.lang.ref.Cleaner} and remove the overriding
	* {@code finalize} method.
	*
	* @implSpec
	* If this {@code ZipFile} has been subclassed and the {@code close} method has
	* been overridden, the {@code close} method will be called by the finalization
	* when {@code ZipFile} is unreachable. But the subclasses should not depend on
	* this specific implementation; the finalization is not reliable and the
	* {@code finalize} method is deprecated to be removed.
	*
	* @author David Connelly
	* @since 1.1
	*/
	public
	class ZipFile implements ZipConstants, Closeable {

	private final String name; // zip file name
	private volatile boolean closeRequested;
	private final @Stable ZipCoder zc;

	// The "resource" used by this zip file that needs to be
	// cleaned after use.
	// a) the input streams that need to be closed
	// b) the list of cached Inflater objects
	// c) the "native" source of this zip file.
	private final @Stable CleanableResource res;

	private static final int STORED = ZipEntry.STORED;
	private static final int DEFLATED = ZipEntry.DEFLATED;

	/**
	* Mode flag to open a zip file for reading.
	*/
	public static final int OPEN_READ = 0x1;

	/**
	* Mode flag to open a zip file and mark it for deletion. The file will be
	* deleted some time between the moment that it is opened and the moment
	* that it is closed, but its contents will remain accessible via the
	* {@code ZipFile} object until either the close method is invoked or the
	* virtual machine exits.
	*/
	public static final int OPEN_DELETE = 0x4;

	/**
	* Opens a zip file for reading.
	*
	* <p>First, if there is a security manager, its {@code checkRead}
	* method is called with the {@code name} argument as its argument
	* to ensure the read is allowed.
	*
	* <p>The UTF-8 {@link java.nio.charset.Charset charset} is used to
	* decode the entry names and comments.
	*
	* @param name the name of the zip file
	* @throws ZipException if a ZIP format error has occurred
	* @throws IOException if an I/O error has occurred
	* @throws SecurityException if a security manager exists and its
	* {@code checkRead} method doesn't allow read access to the file.
	*
	* @see SecurityManager#checkRead(java.lang.String)
	*/
	public ZipFile(String name) throws IOException {
	this(new File(name), OPEN_READ);
	}

	/**
	* Opens a new {@code ZipFile} to read from the specified
	* {@code File} object in the specified mode. The mode argument
	* must be either {@code OPEN_READ} or {@code OPEN_READ \| OPEN_DELETE}.
	*
	* <p>First, if there is a security manager, its {@code checkRead}
	* method is called with the {@code name} argument as its argument to
	* ensure the read is allowed.
	*
	* <p>The UTF-8 {@link java.nio.charset.Charset charset} is used to
	* decode the entry names and comments
	*
	* @param file the ZIP file to be opened for reading
	* @param mode the mode in which the file is to be opened
	* @throws ZipException if a ZIP format error has occurred
	* @throws IOException if an I/O error has occurred
	* @throws SecurityException if a security manager exists and
	* its {@code checkRead} method
	* doesn't allow read access to the file,
	* or its {@code checkDelete} method doesn't allow deleting
	* the file when the {@code OPEN_DELETE} flag is set.
	* @throws IllegalArgumentException if the {@code mode} argument is invalid
	* @see SecurityManager#checkRead(java.lang.String)
	* @since 1.3
	*/
	public ZipFile(File file, int mode) throws IOException {
	this(file, mode, StandardCharsets.UTF_8);
	}

	/**
	* Opens a ZIP file for reading given the specified File object.
	*
	* <p>The UTF-8 {@link java.nio.charset.Charset charset} is used to
	* decode the entry names and comments.
	*
	* @param file the ZIP file to be opened for reading
	* @throws ZipException if a ZIP format error has occurred
	* @throws IOException if an I/O error has occurred
	*/
	public ZipFile(File file) throws ZipException, IOException {
	this(file, OPEN_READ);
	}

	/**
	* Opens a new {@code ZipFile} to read from the specified
	* {@code File} object in the specified mode. The mode argument
	* must be either {@code OPEN_READ} or {@code OPEN_READ \| OPEN_DELETE}.
	*
	* <p>First, if there is a security manager, its {@code checkRead}
	* method is called with the {@code name} argument as its argument to
	* ensure the read is allowed.
	*
	* @param file the ZIP file to be opened for reading
	* @param mode the mode in which the file is to be opened
	* @param charset
	* the {@linkplain java.nio.charset.Charset charset} to
	* be used to decode the ZIP entry name and comment that are not
	* encoded by using UTF-8 encoding (indicated by entry's general
	* purpose flag).
	*
	* @throws ZipException if a ZIP format error has occurred
	* @throws IOException if an I/O error has occurred
	*
	* @throws SecurityException
	* if a security manager exists and its {@code checkRead}
	* method doesn't allow read access to the file,or its
	* {@code checkDelete} method doesn't allow deleting the
	* file when the {@code OPEN_DELETE} flag is set
	*
	* @throws IllegalArgumentException if the {@code mode} argument is invalid
	*
	* @see SecurityManager#checkRead(java.lang.String)
	*
	* @since 1.7
	*/
	public ZipFile(File file, int mode, Charset charset) throws IOException
	{
	if (((mode & OPEN_READ) == 0) \|\|
	((mode & ~(OPEN_READ \| OPEN_DELETE)) != 0)) {
	throw new IllegalArgumentException("Illegal mode: 0x"+
	Integer.toHexString(mode));
	}
	String name = file.getPath();
	SecurityManager sm = System.getSecurityManager();
	if (sm != null) {
	sm.checkRead(name);
	if ((mode & OPEN_DELETE) != 0) {
	sm.checkDelete(name);
	}
	}
	Objects.requireNonNull(charset, "charset");

	this.zc = ZipCoder.get(charset);
	this.name = name;
	long t0 = System.nanoTime();

	this.res = CleanableResource.get(this, file, mode);

	PerfCounter.getZipFileOpenTime().addElapsedTimeFrom(t0);
	PerfCounter.getZipFileCount().increment();
	}

	/**
	* Opens a zip file for reading.
	*
	* <p>First, if there is a security manager, its {@code checkRead}
	* method is called with the {@code name} argument as its argument
	* to ensure the read is allowed.
	*
	* @param name the name of the zip file
	* @param charset
	* the {@linkplain java.nio.charset.Charset charset} to
	* be used to decode the ZIP entry name and comment that are not
	* encoded by using UTF-8 encoding (indicated by entry's general
	* purpose flag).
	*
	* @throws ZipException if a ZIP format error has occurred
	* @throws IOException if an I/O error has occurred
	* @throws SecurityException
	* if a security manager exists and its {@code checkRead}
	* method doesn't allow read access to the file
	*
	* @see SecurityManager#checkRead(java.lang.String)
	*
	* @since 1.7
	*/
	public ZipFile(String name, Charset charset) throws IOException
	{
	this(new File(name), OPEN_READ, charset);
	}

	/**
	* Opens a ZIP file for reading given the specified File object.
	*
	* @param file the ZIP file to be opened for reading
	* @param charset
	* The {@linkplain java.nio.charset.Charset charset} to be
	* used to decode the ZIP entry name and comment (ignored if
	* the <a href="package-summary.html#lang_encoding"> language
	* encoding bit</a> of the ZIP entry's general purpose bit
	* flag is set).
	*
	* @throws ZipException if a ZIP format error has occurred
	* @throws IOException if an I/O error has occurred
	*
	* @since 1.7
	*/
	public ZipFile(File file, Charset charset) throws IOException
	{
	this(file, OPEN_READ, charset);
	}

	/**
	* Returns the zip file comment, or null if none.
	*
	* @return the comment string for the zip file, or null if none
	*
	* @throws IllegalStateException if the zip file has been closed
	*
	* @since 1.7
	*/
	public String getComment() {
	synchronized (this) {
	ensureOpen();
	if (res.zsrc.comment == null) {
	return null;
	}
	return zc.toString(res.zsrc.comment);
	}
	}

	/**
	* Returns the zip file entry for the specified name, or null
	* if not found.
	*
	* @param name the name of the entry
	* @return the zip file entry, or null if not found
	* @throws IllegalStateException if the zip file has been closed
	*/
	public ZipEntry getEntry(String name) {
	return getEntry(name, ZipEntry::new);
	}

	/*
	* Returns the zip file entry for the specified name, or null
	* if not found.
	*
	* @param name the name of the entry
	* @param func the function that creates the returned entry
	*
	* @return the zip file entry, or null if not found
	* @throws IllegalStateException if the zip file has been closed
	*/
	private ZipEntry getEntry(String name, Function<String, ? extends ZipEntry> func) {
	Objects.requireNonNull(name, "name");
	synchronized (this) {
	ensureOpen();
	byte[] bname = zc.getBytes(name);
	int pos = res.zsrc.getEntryPos(bname, true);
	if (pos != -1) {
	return getZipEntry(name, bname, pos, func);
	}
	}
	return null;
	}

	/**
	* Returns an input stream for reading the contents of the specified
	* zip file entry.
	* <p>
	* Closing this ZIP file will, in turn, close all input streams that
	* have been returned by invocations of this method.
	*
	* @param entry the zip file entry
	* @return the input stream for reading the contents of the specified
	* zip file entry.
	* @throws ZipException if a ZIP format error has occurred
	* @throws IOException if an I/O error has occurred
	* @throws IllegalStateException if the zip file has been closed
	*/
	public InputStream getInputStream(ZipEntry entry) throws IOException {
	Objects.requireNonNull(entry, "entry");
	int pos = -1;
	ZipFileInputStream in;
	Source zsrc = res.zsrc;
	Set<InputStream> istreams = res.istreams;
	synchronized (this) {
	ensureOpen();
	if (Objects.equals(lastEntryName, entry.name)) {
	pos = lastEntryPos;
	} else if (!zc.isUTF8() && (entry.flag & USE_UTF8) != 0) {
	pos = zsrc.getEntryPos(zc.getBytesUTF8(entry.name), false);
	} else {
	pos = zsrc.getEntryPos(zc.getBytes(entry.name), false);
	}
	if (pos == -1) {
	return null;
	}
	in = new ZipFileInputStream(zsrc.cen, pos);
	switch (CENHOW(zsrc.cen, pos)) {
	case STORED:
	synchronized (istreams) {
	istreams.add(in);
	}
	return in;
	case DEFLATED:
	// Inflater likes a bit of slack
	// MORE: Compute good size for inflater stream:
	long size = CENLEN(zsrc.cen, pos) + 2;
	if (size > 65536) {
	size = 8192;
	}
	if (size <= 0) {
	size = 4096;
	}
	InputStream is = new ZipFileInflaterInputStream(in, res, (int)size);
	synchronized (istreams) {
	istreams.add(is);
	}
	return is;
	default:
	throw new ZipException("invalid compression method");
	}
	}
	}

	private static class InflaterCleanupAction implements Runnable {
	private final Inflater inf;
	private final CleanableResource res;

	InflaterCleanupAction(Inflater inf, CleanableResource res) {
	this.inf = inf;
	this.res = res;
	}

	@Override
	public void run() {
	res.releaseInflater(inf);
	}
	}

	private class ZipFileInflaterInputStream extends InflaterInputStream {
	private volatile boolean closeRequested;
	private boolean eof = false;
	private final Cleanable cleanable;

	ZipFileInflaterInputStream(ZipFileInputStream zfin,
	CleanableResource res, int size) {
	this(zfin, res, res.getInflater(), size);
	}

	private ZipFileInflaterInputStream(ZipFileInputStream zfin,
	CleanableResource res,
	Inflater inf, int size) {
	super(zfin, inf, size);
	this.cleanable = CleanerFactory.cleaner().register(this,
	new InflaterCleanupAction(inf, res));
	}

	public void close() throws IOException {
	if (closeRequested)
	return;
	closeRequested = true;
	super.close();
	synchronized (res.istreams) {
	res.istreams.remove(this);
	}
	cleanable.clean();
	}

	// Override fill() method to provide an extra "dummy" byte
	// at the end of the input stream. This is required when
	// using the "nowrap" Inflater option.
	protected void fill() throws IOException {
	if (eof) {
	throw new EOFException("Unexpected end of ZLIB input stream");
	}
	len = in.read(buf, 0, buf.length);
	if (len == -1) {
	buf[0] = 0;
	len = 1;
	eof = true;
	}
	inf.setInput(buf, 0, len);
	}

	public int available() throws IOException {
	if (closeRequested)
	return 0;
	long avail = ((ZipFileInputStream)in).size() - inf.getBytesWritten();
	return (avail > (long) Integer.MAX_VALUE ?
	Integer.MAX_VALUE : (int) avail);
	}
	}

	/**
	* Returns the path name of the ZIP file.
	* @return the path name of the ZIP file
	*/
	public String getName() {
	return name;
	}

	private class ZipEntryIterator<T extends ZipEntry>
	implements Enumeration<T>, Iterator<T> {

	private int i = 0;
	private final int entryCount;
	private final Function<String, T> gen;

	public ZipEntryIterator(int entryCount, Function<String, T> gen) {
	this.entryCount = entryCount;
	this.gen = gen;
	}

	@Override
	public boolean hasMoreElements() {
	return hasNext();
	}

	@Override
	public boolean hasNext() {
	return i < entryCount;
	}

	@Override
	public T nextElement() {
	return next();
	}

	@Override
	@SuppressWarnings("unchecked")
	public T next() {
	synchronized (ZipFile.this) {
	ensureOpen();
	if (!hasNext()) {
	throw new NoSuchElementException();
	}
	// each "entry" has 3 ints in table entries
	return (T)getZipEntry(null, null, res.zsrc.getEntryPos(i++ * 3), gen);
	}
	}

	@Override
	public Iterator<T> asIterator() {
	return this;
	}
	}

	/**
	* Returns an enumeration of the ZIP file entries.
	* @return an enumeration of the ZIP file entries
	* @throws IllegalStateException if the zip file has been closed
	*/
	public Enumeration<? extends ZipEntry> entries() {
	synchronized (this) {
	ensureOpen();
	return new ZipEntryIterator<ZipEntry>(res.zsrc.total, ZipEntry::new);
	}
	}

	private Enumeration<JarEntry> entries(Function<String, JarEntry> func) {
	synchronized (this) {
	ensureOpen();
	return new ZipEntryIterator<JarEntry>(res.zsrc.total, func);
	}
	}

	private class EntrySpliterator<T> extends Spliterators.AbstractSpliterator<T> {
	private int index;
	private final int fence;
	private final IntFunction<T> gen;

	EntrySpliterator(int index, int fence, IntFunction<T> gen) {
	super((long)fence,
	Spliterator.ORDERED \| Spliterator.DISTINCT \| Spliterator.IMMUTABLE \|
	Spliterator.NONNULL);
	this.index = index;
	this.fence = fence;
	this.gen = gen;
	}

	@Override
	public boolean tryAdvance(Consumer<? super T> action) {
	if (action == null)
	throw new NullPointerException();
	if (index >= 0 && index < fence) {
	synchronized (ZipFile.this) {
	ensureOpen();
	action.accept(gen.apply(res.zsrc.getEntryPos(index++ * 3)));
	}
	return true;
	}
	return false;
	}
	}

	/**
	* Returns an ordered {@code Stream} over the ZIP file entries.
	*
	* Entries appear in the {@code Stream} in the order they appear in
	* the central directory of the ZIP file.
	*
	* @return an ordered {@code Stream} of entries in this ZIP file
	* @throws IllegalStateException if the zip file has been closed
	* @since 1.8
	*/
	public Stream<? extends ZipEntry> stream() {
	synchronized (this) {
	ensureOpen();
	return StreamSupport.stream(new EntrySpliterator<>(0, res.zsrc.total,
	pos -> getZipEntry(null, null, pos, ZipEntry::new)), false);
	}
	}

	private String getEntryName(int pos) {
	byte[] cen = res.zsrc.cen;
	int nlen = CENNAM(cen, pos);
	if (!zc.isUTF8() && (CENFLG(cen, pos) & USE_UTF8) != 0) {
	return zc.toStringUTF8(cen, pos + CENHDR, nlen);
	} else {
	return zc.toString(cen, pos + CENHDR, nlen);
	}
	}

	/*
	* Returns an ordered {@code Stream} over the zip file entry names.
	*
	* Entry names appear in the {@code Stream} in the order they appear in
	* the central directory of the ZIP file.
	*
	* @return an ordered {@code Stream} of entry names in this zip file
	* @throws IllegalStateException if the zip file has been closed
	* @since 10
	*/
	private Stream<String> entryNameStream() {
	synchronized (this) {
	ensureOpen();
	return StreamSupport.stream(
	new EntrySpliterator<>(0, res.zsrc.total, this::getEntryName), false);
	}
	}

	/*
	* Returns an ordered {@code Stream} over the zip file entries.
	*
	* Entries appear in the {@code Stream} in the order they appear in
	* the central directory of the jar file.
	*
	* @param func the function that creates the returned entry
	* @return an ordered {@code Stream} of entries in this zip file
	* @throws IllegalStateException if the zip file has been closed
	* @since 10
	*/
	private Stream<JarEntry> stream(Function<String, JarEntry> func) {
	synchronized (this) {
	ensureOpen();
	return StreamSupport.stream(new EntrySpliterator<>(0, res.zsrc.total,
	pos -> (JarEntry)getZipEntry(null, null, pos, func)), false);
	}
	}

	private String lastEntryName;
	private int lastEntryPos;

	/* Checks ensureOpen() before invoke this method */
	private ZipEntry getZipEntry(String name, byte[] bname, int pos,
	Function<String, ? extends ZipEntry> func) {
	byte[] cen = res.zsrc.cen;
	int nlen = CENNAM(cen, pos);
	int elen = CENEXT(cen, pos);
	int clen = CENCOM(cen, pos);
	int flag = CENFLG(cen, pos);
	if (name == null \|\| bname.length != nlen) {
	// to use the entry name stored in cen, if the passed in name is
	// (1) null, invoked from iterator, or
	// (2) not equal to the name stored, a slash is appended during
	// getEntryPos() search.
	if (!zc.isUTF8() && (flag & USE_UTF8) != 0) {
	name = zc.toStringUTF8(cen, pos + CENHDR, nlen);
	} else {
	name = zc.toString(cen, pos + CENHDR, nlen);
	}
	}
	ZipEntry e = func.apply(name); //ZipEntry e = new ZipEntry(name);
	e.flag = flag;
	e.xdostime = CENTIM(cen, pos);
	e.crc = CENCRC(cen, pos);
	e.size = CENLEN(cen, pos);
	e.csize = CENSIZ(cen, pos);
	e.method = CENHOW(cen, pos);
	if (elen != 0) {
	int start = pos + CENHDR + nlen;
	e.setExtra0(Arrays.copyOfRange(cen, start, start + elen), true);
	}
	if (clen != 0) {
	int start = pos + CENHDR + nlen + elen;
	if (!zc.isUTF8() && (flag & USE_UTF8) != 0) {
	e.comment = zc.toStringUTF8(cen, start, clen);
	} else {
	e.comment = zc.toString(cen, start, clen);
	}
	}
	lastEntryName = e.name;
	lastEntryPos = pos;
	return e;
	}

	/**
	* Returns the number of entries in the ZIP file.
	*
	* @return the number of entries in the ZIP file
	* @throws IllegalStateException if the zip file has been closed
	*/
	public int size() {
	synchronized (this) {
	ensureOpen();
	return res.zsrc.total;
	}
	}

	private static class CleanableResource implements Runnable {
	// The outstanding inputstreams that need to be closed
	final Set<InputStream> istreams;

	// List of cached Inflater objects for decompression
	Deque<Inflater> inflaterCache;

	final Cleanable cleanable;

	Source zsrc;

	CleanableResource(ZipFile zf, File file, int mode) throws IOException {
	this.cleanable = CleanerFactory.cleaner().register(zf, this);
	this.istreams = Collections.newSetFromMap(new WeakHashMap<>());
	this.inflaterCache = new ArrayDeque<>();
	this.zsrc = Source.get(file, (mode & OPEN_DELETE) != 0);
	}

	void clean() {
	cleanable.clean();
	}

	/*
	* Gets an inflater from the list of available inflaters or allocates
	* a new one.
	*/
	Inflater getInflater() {
	Inflater inf;
	synchronized (inflaterCache) {
	if ((inf = inflaterCache.poll()) != null) {
	return inf;
	}
	}
	return new Inflater(true);
	}

	/*
	* Releases the specified inflater to the list of available inflaters.
	*/
	void releaseInflater(Inflater inf) {
	Deque<Inflater> inflaters = this.inflaterCache;
	if (inflaters != null) {
	synchronized (inflaters) {
	// double checked!
	if (inflaters == this.inflaterCache) {
	inf.reset();
	inflaters.add(inf);
	return;
	}
	}
	}
	// inflaters cache already closed - just end it.
	inf.end();
	}

	public void run() {
	IOException ioe = null;

	// Release cached inflaters and close the cache first
	Deque<Inflater> inflaters = this.inflaterCache;
	if (inflaters != null) {
	synchronized (inflaters) {
	// no need to double-check as only one thread gets a
	// chance to execute run() (Cleaner guarantee)...
	Inflater inf;
	while ((inf = inflaters.poll()) != null) {
	inf.end();
	}
	// close inflaters cache
	this.inflaterCache = null;
	}
	}

	// Close streams, release their inflaters
	if (istreams != null) {
	synchronized (istreams) {
	if (!istreams.isEmpty()) {
	InputStream[] copy = istreams.toArray(new InputStream[0]);
	istreams.clear();
	for (InputStream is : copy) {
	try {
	is.close();
	} catch (IOException e) {
	if (ioe == null) ioe = e;
	else ioe.addSuppressed(e);
	}
	}
	}
	}
	}

	// Release zip src
	if (zsrc != null) {
	synchronized (zsrc) {
	try {
	Source.release(zsrc);
	zsrc = null;
	} catch (IOException e) {
	if (ioe == null) ioe = e;
	else ioe.addSuppressed(e);
	}
	}
	}
	if (ioe != null) {
	throw new UncheckedIOException(ioe);
	}
	}

	CleanableResource(File file, int mode)
	throws IOException {
	this.cleanable = null;
	this.istreams = Collections.newSetFromMap(new WeakHashMap<>());
	this.inflaterCache = new ArrayDeque<>();
	this.zsrc = Source.get(file, (mode & OPEN_DELETE) != 0);
	}

	/*
	* If {@code ZipFile} has been subclassed and the {@code close} method is
	* overridden, uses the {@code finalizer} mechanism for resource cleanup.
	* So {@code close} method can be called when the the {@code ZipFile} is
	* unreachable. This mechanism will be removed when {@code finalize} method
	* is removed from {@code ZipFile}.
	*/
	static CleanableResource get(ZipFile zf, File file, int mode)
	throws IOException {
	Class<?> clz = zf.getClass();
	while (clz != ZipFile.class && clz != JarFile.class) {
	if (JLA.getDeclaredPublicMethods(clz, "close").size() != 0) {
	return new FinalizableResource(zf, file, mode);
	}
	clz = clz.getSuperclass();
	}
	return new CleanableResource(zf, file, mode);
	}

	static class FinalizableResource extends CleanableResource {
	ZipFile zf;
	FinalizableResource(ZipFile zf, File file, int mode)
	throws IOException {
	super(file, mode);
	this.zf = zf;
	}

	@Override
	void clean() {
	run();
	}

	@Override
	@SuppressWarnings("deprecation")
	protected void finalize() throws IOException {
	zf.close();
	}
	}
	}

	/**
	* Closes the ZIP file.
	*
	* <p> Closing this ZIP file will close all of the input streams
	* previously returned by invocations of the {@link #getInputStream
	* getInputStream} method.
	*
	* @throws IOException if an I/O error has occurred
	*/
	public void close() throws IOException {
	if (closeRequested) {
	return;
	}
	closeRequested = true;

	synchronized (this) {
	// Close streams, release their inflaters, release cached inflaters
	// and release zip source
	try {
	res.clean();
	} catch (UncheckedIOException ioe) {
	throw ioe.getCause();
	}
	}
	}

	/**
	* Ensures that the system resources held by this ZipFile object are
	* released when there are no more references to it.
	*
	* @deprecated The {@code finalize} method has been deprecated and will be
	* removed. It is implemented as a no-op. Subclasses that override
	* {@code finalize} in order to perform cleanup should be modified to
	* use alternative cleanup mechanisms and to remove the overriding
	* {@code finalize} method. The recommended cleanup for ZipFile object
	* is to explicitly invoke {@code close} method when it is no longer in
	* use, or use try-with-resources. If the {@code close} is not invoked
	* explicitly the resources held by this object will be released when
	* the instance becomes unreachable.
	*
	* @throws IOException if an I/O error has occurred
	*/
	@Deprecated(since="9", forRemoval=true)
	protected void finalize() throws IOException {}

	private void ensureOpen() {
	if (closeRequested) {
	throw new IllegalStateException("zip file closed");
	}
	if (res.zsrc == null) {
	throw new IllegalStateException("The object is not initialized.");
	}
	}

	private void ensureOpenOrZipException() throws IOException {
	if (closeRequested) {
	throw new ZipException("ZipFile closed");
	}
	}

	/*
	* Inner class implementing the input stream used to read a
	* (possibly compressed) zip file entry.
	*/
	private class ZipFileInputStream extends InputStream {
	private volatile boolean closeRequested;
	private long pos; // current position within entry data
	protected long rem; // number of remaining bytes within entry
	protected long size; // uncompressed size of this entry

	ZipFileInputStream(byte[] cen, int cenpos) {
	rem = CENSIZ(cen, cenpos);
	size = CENLEN(cen, cenpos);
	pos = CENOFF(cen, cenpos);
	// zip64
	if (rem == ZIP64_MAGICVAL \|\| size == ZIP64_MAGICVAL \|\|
	pos == ZIP64_MAGICVAL) {
	checkZIP64(cen, cenpos);
	}
	// negative for lazy initialization, see getDataOffset();
	pos = - (pos + ZipFile.this.res.zsrc.locpos);
	}

	private void checkZIP64(byte[] cen, int cenpos) {
	int off = cenpos + CENHDR + CENNAM(cen, cenpos);
	int end = off + CENEXT(cen, cenpos);
	while (off + 4 < end) {
	int tag = get16(cen, off);
	int sz = get16(cen, off + 2);
	off += 4;
	if (off + sz > end) // invalid data
	break;
	if (tag == EXTID_ZIP64) {
	if (size == ZIP64_MAGICVAL) {
	if (sz < 8 \|\| (off + 8) > end)
	break;
	size = get64(cen, off);
	sz -= 8;
	off += 8;
	}
	if (rem == ZIP64_MAGICVAL) {
	if (sz < 8 \|\| (off + 8) > end)
	break;
	rem = get64(cen, off);
	sz -= 8;
	off += 8;
	}
	if (pos == ZIP64_MAGICVAL) {
	if (sz < 8 \|\| (off + 8) > end)
	break;
	pos = get64(cen, off);
	sz -= 8;
	off += 8;
	}
	break;
	}
	off += sz;
	}
	}

	/*
	* The Zip file spec explicitly allows the LOC extra data size to
	* be different from the CEN extra data size. Since we cannot trust
	* the CEN extra data size, we need to read the LOC to determine
	* the entry data offset.
	*/
	private long initDataOffset() throws IOException {
	if (pos <= 0) {
	byte[] loc = new byte[LOCHDR];
	pos = -pos;
	int len = ZipFile.this.res.zsrc.readFullyAt(loc, 0, loc.length, pos);
	if (len != LOCHDR) {
	throw new ZipException("ZipFile error reading zip file");
	}
	if (LOCSIG(loc) != LOCSIG) {
	throw new ZipException("ZipFile invalid LOC header (bad signature)");
	}
	pos += LOCHDR + LOCNAM(loc) + LOCEXT(loc);
	}
	return pos;
	}

	public int read(byte b[], int off, int len) throws IOException {
	synchronized (ZipFile.this) {
	ensureOpenOrZipException();
	initDataOffset();
	if (rem == 0) {
	return -1;
	}
	if (len > rem) {
	len = (int) rem;
	}
	if (len <= 0) {
	return 0;
	}
	len = ZipFile.this.res.zsrc.readAt(b, off, len, pos);
	if (len > 0) {
	pos += len;
	rem -= len;
	}
	}
	if (rem == 0) {
	close();
	}
	return len;
	}

	public int read() throws IOException {
	byte[] b = new byte[1];
	if (read(b, 0, 1) == 1) {
	return b[0] & 0xff;
	} else {
	return -1;
	}
	}

	public long skip(long n) throws IOException {
	synchronized (ZipFile.this) {
	initDataOffset();
	if (n > rem) {
	n = rem;
	}
	pos += n;
	rem -= n;
	}
	if (rem == 0) {
	close();
	}
	return n;
	}

	public int available() {
	return rem > Integer.MAX_VALUE ? Integer.MAX_VALUE : (int) rem;
	}

	public long size() {
	return size;
	}

	public void close() {
	if (closeRequested) {
	return;
	}
	closeRequested = true;
	rem = 0;
	synchronized (res.istreams) {
	res.istreams.remove(this);
	}
	}

	}

	/**
	* Returns the names of all non-directory entries that begin with
	* "META-INF/" (case ignored). This method is used in JarFile, via
	* SharedSecrets, as an optimization when looking up manifest and
	* signature file entries. Returns null if no entries were found.
	*/
	private String[] getMetaInfEntryNames() {
	synchronized (this) {
	ensureOpen();
	Source zsrc = res.zsrc;
	if (zsrc.metanames == null) {
	return null;
	}
	String[] names = new String[zsrc.metanames.length];
	byte[] cen = zsrc.cen;
	for (int i = 0; i < names.length; i++) {
	int pos = zsrc.metanames[i];
	names[i] = new String(cen, pos + CENHDR, CENNAM(cen, pos),
	StandardCharsets.UTF_8);
	}
	return names;
	}
	}

	private static boolean isWindows;
	private static final JavaLangAccess JLA;

	static {
	SharedSecrets.setJavaUtilZipFileAccess(
	new JavaUtilZipFileAccess() {
	@Override
	public boolean startsWithLocHeader(ZipFile zip) {
	return zip.res.zsrc.startsWithLoc;
	}
	@Override
	public String[] getMetaInfEntryNames(ZipFile zip) {
	return zip.getMetaInfEntryNames();
	}
	@Override
	public JarEntry getEntry(ZipFile zip, String name,
	Function<String, JarEntry> func) {
	return (JarEntry)zip.getEntry(name, func);
	}
	@Override
	public Enumeration<JarEntry> entries(ZipFile zip,
	Function<String, JarEntry> func) {
	return zip.entries(func);
	}
	@Override
	public Stream<JarEntry> stream(ZipFile zip,
	Function<String, JarEntry> func) {
	return zip.stream(func);
	}
	@Override
	public Stream<String> entryNameStream(ZipFile zip) {
	return zip.entryNameStream();
	}
	}
	);
	JLA = jdk.internal.misc.SharedSecrets.getJavaLangAccess();
	isWindows = VM.getSavedProperty("os.name").contains("Windows");
	}

	private static class Source {
	private final Key key; // the key in files
	private int refs = 1;

	private RandomAccessFile zfile; // zfile of the underlying zip file
	private byte[] cen; // CEN & ENDHDR
	private long locpos; // position of first LOC header (usually 0)
	private byte[] comment; // zip file comment
	// list of meta entries in META-INF dir
	private int[] metanames;
	private final boolean startsWithLoc; // true, if zip file starts with LOCSIG (usually true)

	// A Hashmap for all entries.
	//
	// A cen entry of Zip/JAR file. As we have one for every entry in every active Zip/JAR,
	// We might have a lot of these in a typical system. In order to save space we don't
	// keep the name in memory, but merely remember a 32 bit {@code hash} value of the
	// entry name and its offset {@code pos} in the central directory hdeader.
	//
	// private static class Entry {
	// int hash; // 32 bit hashcode on name
	// int next; // hash chain: index into entries
	// int pos; // Offset of central directory file header
	// }
	// private Entry[] entries; // array of hashed cen entry
	//
	// To reduce the total size of entries further, we use a int[] here to store 3 "int"
	// {@code hash}, {@code next and {@code "pos for each entry. The entry can then be
	// referred by their index of their positions in the {@code entries}.
	//
	private int[] entries; // array of hashed cen entry
	private int addEntry(int index, int hash, int next, int pos) {
	entries[index++] = hash;
	entries[index++] = next;
	entries[index++] = pos;
	return index;
	}
	private int getEntryHash(int index) { return entries[index]; }
	private int getEntryNext(int index) { return entries[index + 1]; }
	private int getEntryPos(int index) { return entries[index + 2]; }
	private static final int ZIP_ENDCHAIN = -1;
	private int total; // total number of entries
	private int[] table; // Hash chain heads: indexes into entries
	private int tablelen; // number of hash heads

	private static class Key {
	BasicFileAttributes attrs;
	File file;

	public Key(File file, BasicFileAttributes attrs) {
	this.attrs = attrs;
	this.file = file;
	}

	public int hashCode() {
	long t = attrs.lastModifiedTime().toMillis();
	return ((int)(t ^ (t >>> 32))) + file.hashCode();
	}

	public boolean equals(Object obj) {
	if (obj instanceof Key) {
	Key key = (Key)obj;
	if (!attrs.lastModifiedTime().equals(key.attrs.lastModifiedTime())) {
	return false;
	}
	Object fk = attrs.fileKey();
	if (fk != null) {
	return fk.equals(key.attrs.fileKey());
	} else {
	return file.equals(key.file);
	}
	}
	return false;
	}
	}
	private static final HashMap<Key, Source> files = new HashMap<>();


	static Source get(File file, boolean toDelete) throws IOException {
	Key key = new Key(file,
	Files.readAttributes(file.toPath(), BasicFileAttributes.class));
	Source src;
	synchronized (files) {
	src = files.get(key);
	if (src != null) {
	src.refs++;
	return src;
	}
	}
	src = new Source(key, toDelete);

	synchronized (files) {
	if (files.containsKey(key)) { // someone else put in first
	src.close(); // close the newly created one
	src = files.get(key);
	src.refs++;
	return src;
	}
	files.put(key, src);
	return src;
	}
	}

	static void release(Source src) throws IOException {
	synchronized (files) {
	if (src != null && --src.refs == 0) {
	files.remove(src.key);
	src.close();
	}
	}
	}

	private Source(Key key, boolean toDelete) throws IOException {
	this.key = key;
	if (toDelete) {
	if (isWindows) {
	this.zfile = SharedSecrets.getJavaIORandomAccessFileAccess()
	.openAndDelete(key.file, "r");
	} else {
	this.zfile = new RandomAccessFile(key.file, "r");
	key.file.delete();
	}
	} else {
	this.zfile = new RandomAccessFile(key.file, "r");
	}
	try {
	initCEN(-1);
	byte[] buf = new byte[4];
	readFullyAt(buf, 0, 4, 0);
	this.startsWithLoc = (LOCSIG(buf) == LOCSIG);
	} catch (IOException x) {
	try {
	this.zfile.close();
	} catch (IOException xx) {}
	throw x;
	}
	}

	private void close() throws IOException {
	zfile.close();
	zfile = null;
	cen = null;
	entries = null;
	table = null;
	metanames = null;
	}

	private static final int BUF_SIZE = 8192;
	private final int readFullyAt(byte[] buf, int off, int len, long pos)
	throws IOException
	{
	synchronized (zfile) {
	zfile.seek(pos);
	int N = len;
	while (N > 0) {
	int n = Math.min(BUF_SIZE, N);
	zfile.readFully(buf, off, n);
	off += n;
	N -= n;
	}
	return len;
	}
	}

	private final int readAt(byte[] buf, int off, int len, long pos)
	throws IOException
	{
	synchronized (zfile) {
	zfile.seek(pos);
	return zfile.read(buf, off, len);
	}
	}

	private static final int hashN(byte[] a, int off, int len) {
	int h = 1;
	while (len-- > 0) {
	h = 31 * h + a[off++];
	}
	return h;
	}

	private static final int hash_append(int hash, byte b) {
	return hash * 31 + b;
	}

	private static class End {
	int centot; // 4 bytes
	long cenlen; // 4 bytes
	long cenoff; // 4 bytes
	long endpos; // 4 bytes
	}

	/*
	* 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 {
	long ziplen = zfile.length();
	if (ziplen <= 0)
	zerror("zip file is empty");
	End end = new End();
	byte[] buf = new byte[READBLOCKSZ];
	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') {
	// Found ENDSIG header
	byte[] endbuf = Arrays.copyOfRange(buf, i, i + ENDHDR);
	end.centot = ENDTOT(endbuf);
	end.cenlen = ENDSIZ(endbuf);
	end.cenoff = ENDOFF(endbuf);
	end.endpos = pos + i;
	int comlen = ENDCOM(endbuf);
	if (end.endpos + ENDHDR + comlen != ziplen) {
	// ENDSIG matched, however the size of file comment in it does
	// not match the real size. One "common" cause for this problem
	// is some "extra" bytes are padded at the end of the zipfile.
	// Let's do some extra verification, we don't care about the
	// performance in this situation.
	byte[] sbuf = new byte[4];
	long cenpos = end.endpos - end.cenlen;
	long locpos = cenpos - end.cenoff;
	if (cenpos < 0 \|\|
	locpos < 0 \|\|
	readFullyAt(sbuf, 0, sbuf.length, cenpos) != 4 \|\|
	GETSIG(sbuf) != CENSIG \|\|
	readFullyAt(sbuf, 0, sbuf.length, locpos) != 4 \|\|
	GETSIG(sbuf) != LOCSIG) {
	continue;
	}
	}
	if (comlen > 0) { // this zip file has comlen
	comment = new byte[comlen];
	if (readFullyAt(comment, 0, comlen, end.endpos + ENDHDR) != comlen) {
	zerror("zip comment read failed");
	}
	}
	// must check for a zip64 end record; it is always permitted to be present
	try {
	byte[] loc64 = new byte[ZIP64_LOCHDR];
	if (end.endpos < ZIP64_LOCHDR \|\|
	readFullyAt(loc64, 0, loc64.length, end.endpos - ZIP64_LOCHDR)
	!= loc64.length \|\| GETSIG(loc64) != ZIP64_LOCSIG) {
	return end;
	}
	long end64pos = ZIP64_LOCOFF(loc64);
	byte[] end64buf = new byte[ZIP64_ENDHDR];
	if (readFullyAt(end64buf, 0, end64buf.length, end64pos)
	!= end64buf.length \|\| GETSIG(end64buf) != ZIP64_ENDSIG) {
	return end;
	}
	// end64 candidate found,
	long cenlen64 = ZIP64_ENDSIZ(end64buf);
	long cenoff64 = ZIP64_ENDOFF(end64buf);
	long centot64 = ZIP64_ENDTOT(end64buf);
	// double-check
	if (cenlen64 != end.cenlen && end.cenlen != ZIP64_MAGICVAL \|\|
	cenoff64 != end.cenoff && end.cenoff != ZIP64_MAGICVAL \|\|
	centot64 != end.centot && end.centot != ZIP64_MAGICCOUNT) {
	return end;
	}
	// to use the end64 values
	end.cenlen = cenlen64;
	end.cenoff = cenoff64;
	end.centot = (int)centot64; // assume total < 2g
	end.endpos = end64pos;
	} catch (IOException x) {} // no zip64 loc/end
	return end;
	}
	}
	}
	zerror("zip END header not found");
	return null; //make compiler happy
	}

	// Reads zip file central directory.
	private void initCEN(int knownTotal) throws IOException {
	if (knownTotal == -1) {
	End end = findEND();
	if (end.endpos == 0) {
	locpos = 0;
	total = 0;
	entries = new int[0];
	cen = null;
	return; // 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
	cen = new byte[(int)(end.cenlen + ENDHDR)];
	if (readFullyAt(cen, 0, cen.length, cenpos) != end.cenlen + ENDHDR) {
	zerror("read CEN tables failed");
	}
	total = end.centot;
	} else {
	total = knownTotal;
	}
	// hash table for entries
	entries = new int[total * 3];
	tablelen = ((total/2) \| 1); // Odd -> fewer collisions
	table = new int[tablelen];
	Arrays.fill(table, ZIP_ENDCHAIN);
	int idx = 0;
	int hash = 0;
	int next = -1;

	// list for all meta entries
	ArrayList<Integer> metanamesList = null;

	// Iterate through the entries in the central directory
	int i = 0;
	int hsh = 0;
	int pos = 0;
	int limit = cen.length - ENDHDR;
	while (pos + CENHDR <= limit) {
	if (i >= total) {
	// This will only happen if the zip file has an incorrect
	// ENDTOT field, which usually means it contains more than
	// 65535 entries.
	initCEN(countCENHeaders(cen, limit));
	return;
	}
	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 != STORED && method != DEFLATED)
	zerror("invalid CEN header (bad compression method: " + method + ")");
	if (pos + CENHDR + nlen > limit)
	zerror("invalid CEN header (bad header size)");
	// Record the CEN offset and the name hash in our hash cell.
	hash = hashN(cen, pos + CENHDR, nlen);
	hsh = (hash & 0x7fffffff) % tablelen;
	next = table[hsh];
	table[hsh] = idx;
	idx = addEntry(idx, hash, next, pos);
	// Adds name to metanames.
	if (isMetaName(cen, pos + CENHDR, nlen)) {
	if (metanamesList == null)
	metanamesList = new ArrayList<>(4);
	metanamesList.add(pos);
	}
	// skip ext and comment
	pos += (CENHDR + nlen + elen + clen);
	i++;
	}
	total = i;
	if (metanamesList != null) {
	metanames = new int[metanamesList.size()];
	for (int j = 0, len = metanames.length; j < len; j++) {
	metanames[j] = metanamesList.get(j);
	}
	}
	if (pos + ENDHDR != cen.length) {
	zerror("invalid CEN header (bad header size)");
	}
	}

	private static void zerror(String msg) throws ZipException {
	throw new ZipException(msg);
	}

	/*
	* Returns the {@code pos} of the zip cen entry corresponding to the
	* specified entry name, or -1 if not found.
	*/
	private int getEntryPos(byte[] name, boolean addSlash) {
	if (total == 0) {
	return -1;
	}
	int hsh = hashN(name, 0, name.length);
	int idx = table[(hsh & 0x7fffffff) % tablelen];
	/*
	* This while loop is an optimization where a double lookup
	* for name and name+/ is being performed. The name char
	* array has enough room at the end to try again with a
	* slash appended if the first table lookup does not succeed.
	*/
	while (true) {
	/*
	* Search down the target hash chain for a entry whose
	* 32 bit hash matches the hashed name.
	*/
	while (idx != ZIP_ENDCHAIN) {
	if (getEntryHash(idx) == hsh) {
	// The CEN name must match the specfied one
	int pos = getEntryPos(idx);
	if (name.length == CENNAM(cen, pos)) {
	boolean matched = true;
	int nameoff = pos + CENHDR;
	for (int i = 0; i < name.length; i++) {
	if (name[i] != cen[nameoff++]) {
	matched = false;
	break;
	}
	}
	if (matched) {
	return pos;
	}
	}
	}
	idx = getEntryNext(idx);
	}
	/* If not addSlash, or slash is already there, we are done */
	if (!addSlash \|\| name.length == 0 \|\| name[name.length - 1] == '/') {
	return -1;
	}
	/* Add slash and try once more */
	name = Arrays.copyOf(name, name.length + 1);
	name[name.length - 1] = '/';
	hsh = hash_append(hsh, (byte)'/');
	//idx = table[hsh % tablelen];
	idx = table[(hsh & 0x7fffffff) % tablelen];
	addSlash = false;
	}
	}

	/**
	* Returns true if the bytes represent a non-directory name
	* beginning with "META-INF/", disregarding ASCII case.
	*/
	private static boolean isMetaName(byte[] name, int off, int len) {
	// Use the "oldest ASCII trick in the book"
	return len > 9 // "META-INF/".length()
	&& name[off + len - 1] != '/' // non-directory
	&& (name[off++] \| 0x20) == 'm'
	&& (name[off++] \| 0x20) == 'e'
	&& (name[off++] \| 0x20) == 't'
	&& (name[off++] \| 0x20) == 'a'
	&& (name[off++] ) == '-'
	&& (name[off++] \| 0x20) == 'i'
	&& (name[off++] \| 0x20) == 'n'
	&& (name[off++] \| 0x20) == 'f'
	&& (name[off] ) == '/';
	}

	/**
	* Returns the number of CEN headers in a central directory.
	* Will not throw, even if the zip file is corrupt.
	*
	* @param cen copy of the bytes in a zip file's central directory
	* @param size number of bytes in central directory
	*/
	private static int countCENHeaders(byte[] cen, int size) {
	int count = 0;
	for (int p = 0;
	p + CENHDR <= size;
	p += CENHDR + CENNAM(cen, p) + CENEXT(cen, p) + CENCOM(cen, p))
	count++;
	return count;
	}
	}
	}

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