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	/*
	* Copyright (c) 1997, 2018, 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.jar;

	import java.io.FilterInputStream;
	import java.io.DataOutputStream;
	import java.io.InputStream;
	import java.io.OutputStream;
	import java.io.IOException;
	import java.util.Map;
	import java.util.HashMap;
	import java.util.Iterator;

	/**
	* The Manifest class is used to maintain Manifest entry names and their
	* associated Attributes. There are main Manifest Attributes as well as
	* per-entry Attributes. For information on the Manifest format, please
	* see the
	* <a href="{@docRoot}/../specs/jar/jar.html">
	* Manifest format specification</a>.
	*
	* @author David Connelly
	* @see Attributes
	* @since 1.2
	*/
	public class Manifest implements Cloneable {
	// manifest main attributes
	private Attributes attr = new Attributes();

	// manifest entries
	private Map<String, Attributes> entries = new HashMap<>();

	/**
	* Constructs a new, empty Manifest.
	*/
	public Manifest() {
	}

	/**
	* Constructs a new Manifest from the specified input stream.
	*
	* @param is the input stream containing manifest data
	* @throws IOException if an I/O error has occurred
	*/
	public Manifest(InputStream is) throws IOException {
	read(is);
	}

	/**
	* Constructs a new Manifest that is a copy of the specified Manifest.
	*
	* @param man the Manifest to copy
	*/
	public Manifest(Manifest man) {
	attr.putAll(man.getMainAttributes());
	entries.putAll(man.getEntries());
	}

	/**
	* Returns the main Attributes for the Manifest.
	* @return the main Attributes for the Manifest
	*/
	public Attributes getMainAttributes() {
	return attr;
	}

	/**
	* Returns a Map of the entries contained in this Manifest. Each entry
	* is represented by a String name (key) and associated Attributes (value).
	* The Map permits the {@code null} key, but no entry with a null key is
	* created by {@link #read}, nor is such an entry written by using {@link
	* #write}.
	*
	* @return a Map of the entries contained in this Manifest
	*/
	public Map<String,Attributes> getEntries() {
	return entries;
	}

	/**
	* Returns the Attributes for the specified entry name.
	* This method is defined as:
	* <pre>
	* return (Attributes)getEntries().get(name)
	* </pre>
	* Though {@code null} is a valid {@code name}, when
	* {@code getAttributes(null)} is invoked on a {@code Manifest}
	* obtained from a jar file, {@code null} will be returned. While jar
	* files themselves do not allow {@code null}-named attributes, it is
	* possible to invoke {@link #getEntries} on a {@code Manifest}, and
	* on that result, invoke {@code put} with a null key and an
	* arbitrary value. Subsequent invocations of
	* {@code getAttributes(null)} will return the just-{@code put}
	* value.
	* <p>
	* Note that this method does not return the manifest's main attributes;
	* see {@link #getMainAttributes}.
	*
	* @param name entry name
	* @return the Attributes for the specified entry name
	*/
	public Attributes getAttributes(String name) {
	return getEntries().get(name);
	}

	/**
	* Clears the main Attributes as well as the entries in this Manifest.
	*/
	public void clear() {
	attr.clear();
	entries.clear();
	}

	/**
	* Writes the Manifest to the specified OutputStream.
	* Attributes.Name.MANIFEST_VERSION must be set in
	* MainAttributes prior to invoking this method.
	*
	* @param out the output stream
	* @exception IOException if an I/O error has occurred
	* @see #getMainAttributes
	*/
	@SuppressWarnings("deprecation")
	public void write(OutputStream out) throws IOException {
	DataOutputStream dos = new DataOutputStream(out);
	// Write out the main attributes for the manifest
	attr.writeMain(dos);
	// Now write out the per-entry attributes
	for (Map.Entry<String, Attributes> e : entries.entrySet()) {
	StringBuffer buffer = new StringBuffer("Name: ");
	String value = e.getKey();
	if (value != null) {
	byte[] vb = value.getBytes("UTF8");
	value = new String(vb, 0, 0, vb.length);
	}
	buffer.append(value);
	make72Safe(buffer);
	buffer.append("\r\n");
	dos.writeBytes(buffer.toString());
	e.getValue().write(dos);
	}
	dos.flush();
	}

	/**
	* Adds line breaks to enforce a maximum 72 bytes per line.
	*/
	static void make72Safe(StringBuffer line) {
	int length = line.length();
	int index = 72;
	while (index < length) {
	line.insert(index, "\r\n ");
	index += 74; // + line width + line break ("\r\n")
	length += 3; // + line break ("\r\n") and space
	}
	return;
	}

	/**
	* Reads the Manifest from the specified InputStream. The entry
	* names and attributes read will be merged in with the current
	* manifest entries.
	*
	* @param is the input stream
	* @exception IOException if an I/O error has occurred
	*/
	public void read(InputStream is) throws IOException {
	// Buffered input stream for reading manifest data
	FastInputStream fis = new FastInputStream(is);
	// Line buffer
	byte[] lbuf = new byte[512];
	// Read the main attributes for the manifest
	attr.read(fis, lbuf);
	// Total number of entries, attributes read
	int ecount = 0, acount = 0;
	// Average size of entry attributes
	int asize = 2;
	// Now parse the manifest entries
	int len;
	String name = null;
	boolean skipEmptyLines = true;
	byte[] lastline = null;

	while ((len = fis.readLine(lbuf)) != -1) {
	byte c = lbuf[--len];
	if (c != '\n' && c != '\r') {
	throw new IOException("manifest line too long");
	}
	if (len > 0 && lbuf[len-1] == '\r') {
	--len;
	}
	if (len == 0 && skipEmptyLines) {
	continue;
	}
	skipEmptyLines = false;

	if (name == null) {
	name = parseName(lbuf, len);
	if (name == null) {
	throw new IOException("invalid manifest format");
	}
	if (fis.peek() == ' ') {
	// name is wrapped
	lastline = new byte[len - 6];
	System.arraycopy(lbuf, 6, lastline, 0, len - 6);
	continue;
	}
	} else {
	// continuation line
	byte[] buf = new byte[lastline.length + len - 1];
	System.arraycopy(lastline, 0, buf, 0, lastline.length);
	System.arraycopy(lbuf, 1, buf, lastline.length, len - 1);
	if (fis.peek() == ' ') {
	// name is wrapped
	lastline = buf;
	continue;
	}
	name = new String(buf, 0, buf.length, "UTF8");
	lastline = null;
	}
	Attributes attr = getAttributes(name);
	if (attr == null) {
	attr = new Attributes(asize);
	entries.put(name, attr);
	}
	attr.read(fis, lbuf);
	ecount++;
	acount += attr.size();
	//XXX: Fix for when the average is 0. When it is 0,
	// you get an Attributes object with an initial
	// capacity of 0, which tickles a bug in HashMap.
	asize = Math.max(2, acount / ecount);

	name = null;
	skipEmptyLines = true;
	}
	}

	private String parseName(byte[] lbuf, int len) {
	if (toLower(lbuf[0]) == 'n' && toLower(lbuf[1]) == 'a' &&
	toLower(lbuf[2]) == 'm' && toLower(lbuf[3]) == 'e' &&
	lbuf[4] == ':' && lbuf[5] == ' ') {
	try {
	return new String(lbuf, 6, len - 6, "UTF8");
	}
	catch (Exception e) {
	}
	}
	return null;
	}

	private int toLower(int c) {
	return (c >= 'A' && c <= 'Z') ? 'a' + (c - 'A') : c;
	}

	/**
	* Returns true if the specified Object is also a Manifest and has
	* the same main Attributes and entries.
	*
	* @param o the object to be compared
	* @return true if the specified Object is also a Manifest and has
	* the same main Attributes and entries
	*/
	public boolean equals(Object o) {
	if (o instanceof Manifest) {
	Manifest m = (Manifest)o;
	return attr.equals(m.getMainAttributes()) &&
	entries.equals(m.getEntries());
	} else {
	return false;
	}
	}

	/**
	* Returns the hash code for this Manifest.
	*/
	public int hashCode() {
	return attr.hashCode() + entries.hashCode();
	}

	/**
	* Returns a shallow copy of this Manifest. The shallow copy is
	* implemented as follows:
	* <pre>
	* public Object clone() { return new Manifest(this); }
	* </pre>
	* @return a shallow copy of this Manifest
	*/
	public Object clone() {
	return new Manifest(this);
	}

	/*
	* A fast buffered input stream for parsing manifest files.
	*/
	static class FastInputStream extends FilterInputStream {
	private byte buf[];
	private int count = 0;
	private int pos = 0;

	FastInputStream(InputStream in) {
	this(in, 8192);
	}

	FastInputStream(InputStream in, int size) {
	super(in);
	buf = new byte[size];
	}

	public int read() throws IOException {
	if (pos >= count) {
	fill();
	if (pos >= count) {
	return -1;
	}
	}
	return Byte.toUnsignedInt(buf[pos++]);
	}

	public int read(byte[] b, int off, int len) throws IOException {
	int avail = count - pos;
	if (avail <= 0) {
	if (len >= buf.length) {
	return in.read(b, off, len);
	}
	fill();
	avail = count - pos;
	if (avail <= 0) {
	return -1;
	}
	}
	if (len > avail) {
	len = avail;
	}
	System.arraycopy(buf, pos, b, off, len);
	pos += len;
	return len;
	}

	/*
	* Reads 'len' bytes from the input stream, or until an end-of-line
	* is reached. Returns the number of bytes read.
	*/
	public int readLine(byte[] b, int off, int len) throws IOException {
	byte[] tbuf = this.buf;
	int total = 0;
	while (total < len) {
	int avail = count - pos;
	if (avail <= 0) {
	fill();
	avail = count - pos;
	if (avail <= 0) {
	return -1;
	}
	}
	int n = len - total;
	if (n > avail) {
	n = avail;
	}
	int tpos = pos;
	int maxpos = tpos + n;
	byte c = 0;
	// jar.spec.newline: CRLF \| LF \| CR (not followed by LF)
	while (tpos < maxpos && (c = tbuf[tpos++]) != '\n' && c != '\r');
	if (c == '\r' && tpos < maxpos && tbuf[tpos] == '\n') {
	tpos++;
	}
	n = tpos - pos;
	System.arraycopy(tbuf, pos, b, off, n);
	off += n;
	total += n;
	pos = tpos;
	c = tbuf[tpos-1];
	if (c == '\n') {
	break;
	}
	if (c == '\r') {
	if (count == pos) {
	// try to see if there is a trailing LF
	fill();
	if (pos < count && tbuf[pos] == '\n') {
	if (total < len) {
	b[off++] = '\n';
	total++;
	} else {
	// we should always have big enough lbuf but
	// just in case we don't, replace the last CR
	// with LF.
	b[off - 1] = '\n';
	}
	pos++;
	}
	}
	break;
	}
	}
	return total;
	}

	public byte peek() throws IOException {
	if (pos == count)
	fill();
	if (pos == count)
	return -1; // nothing left in buffer
	return buf[pos];
	}

	public int readLine(byte[] b) throws IOException {
	return readLine(b, 0, b.length);
	}

	public long skip(long n) throws IOException {
	if (n <= 0) {
	return 0;
	}
	long avail = count - pos;
	if (avail <= 0) {
	return in.skip(n);
	}
	if (n > avail) {
	n = avail;
	}
	pos += n;
	return n;
	}

	public int available() throws IOException {
	return (count - pos) + in.available();
	}

	public void close() throws IOException {
	if (in != null) {
	in.close();
	in = null;
	buf = null;
	}
	}

	private void fill() throws IOException {
	count = pos = 0;
	int n = in.read(buf, 0, buf.length);
	if (n > 0) {
	count = n;
	}
	}
	}
	}

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