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	/*
	* Copyright (c) 2000, 2021, 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.net;

	import java.io.IOException;
	import java.io.InvalidObjectException;
	import java.io.ObjectInputStream;
	import java.io.ObjectOutputStream;
	import java.io.ObjectStreamField;
	import java.util.Enumeration;
	import java.util.Arrays;

	/**
	* This class represents an Internet Protocol version 6 (IPv6) address.
	* Defined by <a href="http://www.ietf.org/rfc/rfc2373.txt">
	* <i>RFC 2373: IP Version 6 Addressing Architecture</i></a>.
	*
	* <h2> <a id="format">Textual representation of IP addresses</a> </h2>
	*
	* Textual representation of IPv6 address used as input to methods
	* takes one of the following forms:
	*
	* <ol>
	* <li><p> <a id="lform">The preferred form</a> is x:x:x:x:x:x:x:x,
	* where the 'x's are
	* the hexadecimal values of the eight 16-bit pieces of the
	* address. This is the full form. For example,
	*
	* <blockquote><ul style="list-style-type:none">
	* <li>{@code 1080:0:0:0:8:800:200C:417A}</li>
	* </ul></blockquote>
	*
	* <p> Note that it is not necessary to write the leading zeros in
	* an individual field. However, there must be at least one numeral
	* in every field, except as described below.</li>
	*
	* <li><p> Due to some methods of allocating certain styles of IPv6
	* addresses, it will be common for addresses to contain long
	* strings of zero bits. In order to make writing addresses
	* containing zero bits easier, a special syntax is available to
	* compress the zeros. The use of "::" indicates multiple groups
	* of 16-bits of zeros. The "::" can only appear once in an address.
	* The "::" can also be used to compress the leading and/or trailing
	* zeros in an address. For example,
	*
	* <blockquote><ul style="list-style-type:none">
	* <li>{@code 1080::8:800:200C:417A}</li>
	* </ul></blockquote>
	*
	* <li><p> An alternative form that is sometimes more convenient
	* when dealing with a mixed environment of IPv4 and IPv6 nodes is
	* x:x:x:x:x:x:d.d.d.d, where the 'x's are the hexadecimal values
	* of the six high-order 16-bit pieces of the address, and the 'd's
	* are the decimal values of the four low-order 8-bit pieces of the
	* standard IPv4 representation address, for example,
	*
	* <blockquote><ul style="list-style-type:none">
	* <li>{@code ::FFFF:129.144.52.38}</li>
	* <li>{@code ::129.144.52.38}</li>
	* </ul></blockquote>
	*
	* <p> where "::FFFF:d.d.d.d" and "::d.d.d.d" are, respectively, the
	* general forms of an IPv4-mapped IPv6 address and an
	* IPv4-compatible IPv6 address. Note that the IPv4 portion must be
	* in the "d.d.d.d" form. The following forms are invalid:
	*
	* <blockquote><ul style="list-style-type:none">
	* <li>{@code ::FFFF:d.d.d}</li>
	* <li>{@code ::FFFF:d.d}</li>
	* <li>{@code ::d.d.d}</li>
	* <li>{@code ::d.d}</li>
	* </ul></blockquote>
	*
	* <p> The following form:
	*
	* <blockquote><ul style="list-style-type:none">
	* <li>{@code ::FFFF:d}</li>
	* </ul></blockquote>
	*
	* <p> is valid, however it is an unconventional representation of
	* the IPv4-compatible IPv6 address,
	*
	* <blockquote><ul style="list-style-type:none">
	* <li>{@code ::255.255.0.d}</li>
	* </ul></blockquote>
	*
	* <p> while "::d" corresponds to the general IPv6 address
	* "0:0:0:0:0:0:0:d".</li>
	* </ol>
	*
	* <p> For methods that return a textual representation as output
	* value, the full form is used. Inet6Address will return the full
	* form because it is unambiguous when used in combination with other
	* textual data.
	*
	* <h3> Special IPv6 address </h3>
	*
	* <blockquote>
	* <table class="borderless">
	* <caption style="display:none">Description of IPv4-mapped address</caption>
	* <tr><th style="vertical-align:top; padding-right:2px"><i>IPv4-mapped address</i></th>
	* <td>Of the form ::ffff:w.x.y.z, this IPv6 address is used to
	* represent an IPv4 address. It allows the native program to
	* use the same address data structure and also the same
	* socket when communicating with both IPv4 and IPv6 nodes.
	*
	* <p>In InetAddress and Inet6Address, it is used for internal
	* representation; it has no functional role. Java will never
	* return an IPv4-mapped address. These classes can take an
	* IPv4-mapped address as input, both in byte array and text
	* representation. However, it will be converted into an IPv4
	* address.</td></tr>
	* </table></blockquote>
	*
	* <h3><a id="scoped">Textual representation of IPv6 scoped addresses</a></h3>
	*
	* <p> The textual representation of IPv6 addresses as described above can be
	* extended to specify IPv6 scoped addresses. This extension to the basic
	* addressing architecture is described in [draft-ietf-ipngwg-scoping-arch-04.txt].
	*
	* <p> Because link-local and site-local addresses are non-global, it is possible
	* that different hosts may have the same destination address and may be
	* reachable through different interfaces on the same originating system. In
	* this case, the originating system is said to be connected to multiple zones
	* of the same scope. In order to disambiguate which is the intended destination
	* zone, it is possible to append a zone identifier (or <i>scope_id</i>) to an
	* IPv6 address.
	*
	* <p> The general format for specifying the <i>scope_id</i> is the following:
	*
	* <blockquote><i>IPv6-address</i>%<i>scope_id</i></blockquote>
	* <p> The IPv6-address is a literal IPv6 address as described above.
	* The <i>scope_id</i> refers to an interface on the local system, and it can be
	* specified in two ways.
	* <ol><li><i>As a numeric identifier.</i> This must be a positive integer
	* that identifies the particular interface and scope as understood by the
	* system. Usually, the numeric values can be determined through administration
	* tools on the system. Each interface may have multiple values, one for each
	* scope. If the scope is unspecified, then the default value used is zero.</li>
	* <li><i>As a string.</i> This must be the exact string that is returned by
	* {@link java.net.NetworkInterface#getName()} for the particular interface in
	* question. When an Inet6Address is created in this way, the numeric scope-id
	* is determined at the time the object is created by querying the relevant
	* NetworkInterface.</li></ol>
	*
	* <p> Note also, that the numeric <i>scope_id</i> can be retrieved from
	* Inet6Address instances returned from the NetworkInterface class. This can be
	* used to find out the current scope ids configured on the system.
	* @since 1.4
	*/

	public final
	class Inet6Address extends InetAddress {
	static final int INADDRSZ = 16;

	private static class Inet6AddressHolder {

	private Inet6AddressHolder() {
	ipaddress = new byte[INADDRSZ];
	}

	private Inet6AddressHolder(
	byte[] ipaddress, int scope_id, boolean scope_id_set,
	NetworkInterface ifname, boolean scope_ifname_set)
	{
	this.ipaddress = ipaddress;
	this.scope_id = scope_id;
	this.scope_id_set = scope_id_set;
	this.scope_ifname_set = scope_ifname_set;
	this.scope_ifname = ifname;
	}

	/**
	* Holds a 128-bit (16 bytes) IPv6 address.
	*/
	byte[] ipaddress;

	/**
	* scope_id. The scope specified when the object is created. If the object
	* is created with an interface name, then the scope_id is not determined
	* until the time it is needed.
	*/
	int scope_id; // 0

	/**
	* This will be set to true when the scope_id field contains a valid
	* integer scope_id.
	*/
	boolean scope_id_set; // false

	/**
	* scoped interface. scope_id is derived from this as the scope_id of the first
	* address whose scope is the same as this address for the named interface.
	*/
	NetworkInterface scope_ifname; // null

	/**
	* set if the object is constructed with a scoped
	* interface instead of a numeric scope id.
	*/
	boolean scope_ifname_set; // false;

	void setAddr(byte addr[]) {
	if (addr.length == INADDRSZ) { // normal IPv6 address
	System.arraycopy(addr, 0, ipaddress, 0, INADDRSZ);
	}
	}

	void init(byte addr[], int scope_id) {
	setAddr(addr);

	if (scope_id >= 0) {
	this.scope_id = scope_id;
	this.scope_id_set = true;
	}
	}

	void init(byte addr[], NetworkInterface nif)
	throws UnknownHostException
	{
	setAddr(addr);

	if (nif != null) {
	this.scope_id = deriveNumericScope(ipaddress, nif);
	this.scope_id_set = true;
	this.scope_ifname = nif;
	this.scope_ifname_set = true;
	}
	}

	String getHostAddress() {
	String s = numericToTextFormat(ipaddress);
	if (scope_ifname != null) { /* must check this first */
	s = s + "%" + scope_ifname.getName();
	} else if (scope_id_set) {
	s = s + "%" + scope_id;
	}
	return s;
	}

	public boolean equals(Object o) {
	if (!(o instanceof Inet6AddressHolder that)) {
	return false;
	}

	return Arrays.equals(this.ipaddress, that.ipaddress);
	}

	public int hashCode() {
	if (ipaddress != null) {

	int hash = 0;
	int i=0;
	while (i<INADDRSZ) {
	int j=0;
	int component=0;
	while (j<4 && i<INADDRSZ) {
	component = (component << 8) + ipaddress[i];
	j++;
	i++;
	}
	hash += component;
	}
	return hash;

	} else {
	return 0;
	}
	}

	boolean isIPv4CompatibleAddress() {
	if ((ipaddress[0] == 0x00) && (ipaddress[1] == 0x00) &&
	(ipaddress[2] == 0x00) && (ipaddress[3] == 0x00) &&
	(ipaddress[4] == 0x00) && (ipaddress[5] == 0x00) &&
	(ipaddress[6] == 0x00) && (ipaddress[7] == 0x00) &&
	(ipaddress[8] == 0x00) && (ipaddress[9] == 0x00) &&
	(ipaddress[10] == 0x00) && (ipaddress[11] == 0x00)) {
	return true;
	}
	return false;
	}

	boolean isMulticastAddress() {
	return ((ipaddress[0] & 0xff) == 0xff);
	}

	boolean isAnyLocalAddress() {
	byte test = 0x00;
	for (int i = 0; i < INADDRSZ; i++) {
	test \|= ipaddress[i];
	}
	return (test == 0x00);
	}

	boolean isLoopbackAddress() {
	byte test = 0x00;
	for (int i = 0; i < 15; i++) {
	test \|= ipaddress[i];
	}
	return (test == 0x00) && (ipaddress[15] == 0x01);
	}

	boolean isLinkLocalAddress() {
	return ((ipaddress[0] & 0xff) == 0xfe
	&& (ipaddress[1] & 0xc0) == 0x80);
	}


	boolean isSiteLocalAddress() {
	return ((ipaddress[0] & 0xff) == 0xfe
	&& (ipaddress[1] & 0xc0) == 0xc0);
	}

	boolean isMCGlobal() {
	return ((ipaddress[0] & 0xff) == 0xff
	&& (ipaddress[1] & 0x0f) == 0x0e);
	}

	boolean isMCNodeLocal() {
	return ((ipaddress[0] & 0xff) == 0xff
	&& (ipaddress[1] & 0x0f) == 0x01);
	}

	boolean isMCLinkLocal() {
	return ((ipaddress[0] & 0xff) == 0xff
	&& (ipaddress[1] & 0x0f) == 0x02);
	}

	boolean isMCSiteLocal() {
	return ((ipaddress[0] & 0xff) == 0xff
	&& (ipaddress[1] & 0x0f) == 0x05);
	}

	boolean isMCOrgLocal() {
	return ((ipaddress[0] & 0xff) == 0xff
	&& (ipaddress[1] & 0x0f) == 0x08);
	}
	}

	private final transient Inet6AddressHolder holder6;

	@java.io.Serial
	private static final long serialVersionUID = 6880410070516793377L;

	// Perform native initialization
	static { init(); }

	Inet6Address() {
	super();
	holder.init(null, IPv6);
	holder6 = new Inet6AddressHolder();
	}

	/* checking of value for scope_id should be done by caller
	* scope_id must be >= 0, or -1 to indicate not being set
	*/
	Inet6Address(String hostName, byte addr[], int scope_id) {
	holder.init(hostName, IPv6);
	holder6 = new Inet6AddressHolder();
	holder6.init(addr, scope_id);
	}

	Inet6Address(String hostName, byte addr[]) {
	holder6 = new Inet6AddressHolder();
	try {
	initif (hostName, addr, null);
	} catch (UnknownHostException e) {} /* cant happen if ifname is null */
	}

	Inet6Address (String hostName, byte addr[], NetworkInterface nif)
	throws UnknownHostException
	{
	holder6 = new Inet6AddressHolder();
	initif (hostName, addr, nif);
	}

	Inet6Address (String hostName, byte addr[], String ifname)
	throws UnknownHostException
	{
	holder6 = new Inet6AddressHolder();
	initstr (hostName, addr, ifname);
	}

	/**
	* Create an Inet6Address in the exact manner of {@link
	* InetAddress#getByAddress(String,byte[])} except that the IPv6 scope_id is
	* set to the value corresponding to the given interface for the address
	* type specified in {@code addr}. The call will fail with an
	* UnknownHostException if the given interface does not have a numeric
	* scope_id assigned for the given address type (e.g. link-local or site-local).
	* See <a href="Inet6Address.html#scoped">here</a> for a description of IPv6
	* scoped addresses.
	*
	* @param host the specified host
	* @param addr the raw IP address in network byte order
	* @param nif an interface this address must be associated with.
	* @return an Inet6Address object created from the raw IP address.
	* @throws UnknownHostException
	* if IP address is of illegal length, or if the interface does not
	* have a numeric scope_id assigned for the given address type.
	*
	* @since 1.5
	*/
	public static Inet6Address getByAddress(String host, byte[] addr,
	NetworkInterface nif)
	throws UnknownHostException
	{
	if (host != null && !host.isEmpty() && host.charAt(0) == '[') {
	if (host.charAt(host.length()-1) == ']') {
	host = host.substring(1, host.length() -1);
	}
	}
	if (addr != null) {
	if (addr.length == Inet6Address.INADDRSZ) {
	return new Inet6Address(host, addr, nif);
	}
	}
	throw new UnknownHostException("addr is of illegal length");
	}

	/**
	* Create an Inet6Address in the exact manner of {@link
	* InetAddress#getByAddress(String,byte[])} except that the IPv6 scope_id is
	* set to the given numeric value. The scope_id is not checked to determine
	* if it corresponds to any interface on the system.
	* See <a href="Inet6Address.html#scoped">here</a> for a description of IPv6
	* scoped addresses.
	*
	* @param host the specified host
	* @param addr the raw IP address in network byte order
	* @param scope_id the numeric scope_id for the address.
	* @return an Inet6Address object created from the raw IP address.
	* @throws UnknownHostException if IP address is of illegal length.
	*
	* @since 1.5
	*/
	public static Inet6Address getByAddress(String host, byte[] addr,
	int scope_id)
	throws UnknownHostException
	{
	if (host != null && !host.isEmpty() && host.charAt(0) == '[') {
	if (host.charAt(host.length()-1) == ']') {
	host = host.substring(1, host.length() -1);
	}
	}
	if (addr != null) {
	if (addr.length == Inet6Address.INADDRSZ) {
	return new Inet6Address(host, addr, scope_id);
	}
	}
	throw new UnknownHostException("addr is of illegal length");
	}

	private void initstr(String hostName, byte addr[], String ifname)
	throws UnknownHostException
	{
	try {
	NetworkInterface nif = NetworkInterface.getByName (ifname);
	if (nif == null) {
	throw new UnknownHostException ("no such interface " + ifname);
	}
	initif (hostName, addr, nif);
	} catch (SocketException e) {
	throw new UnknownHostException ("SocketException thrown" + ifname);
	}
	}

	private void initif(String hostName, byte addr[], NetworkInterface nif)
	throws UnknownHostException
	{
	int family = -1;
	holder6.init(addr, nif);

	if (addr.length == INADDRSZ) { // normal IPv6 address
	family = IPv6;
	}
	holder.init(hostName, family);
	}

	/* check the two Ipv6 addresses and return false if they are both
	* non global address types, but not the same.
	* (i.e. one is site-local and the other link-local)
	* return true otherwise.
	*/

	private static boolean isDifferentLocalAddressType(
	byte[] thisAddr, byte[] otherAddr) {

	if (Inet6Address.isLinkLocalAddress(thisAddr) &&
	!Inet6Address.isLinkLocalAddress(otherAddr)) {
	return false;
	}
	if (Inet6Address.isSiteLocalAddress(thisAddr) &&
	!Inet6Address.isSiteLocalAddress(otherAddr)) {
	return false;
	}
	return true;
	}

	private static int deriveNumericScope (byte[] thisAddr, NetworkInterface ifc) throws UnknownHostException {
	Enumeration<InetAddress> addresses = ifc.getInetAddresses();
	while (addresses.hasMoreElements()) {
	InetAddress addr = addresses.nextElement();
	if (!(addr instanceof Inet6Address ia6_addr)) {
	continue;
	}
	/* check if site or link local prefixes match */
	if (!isDifferentLocalAddressType(thisAddr, ia6_addr.getAddress())){
	/* type not the same, so carry on searching */
	continue;
	}
	/* found a matching address - return its scope_id */
	return ia6_addr.getScopeId();
	}
	throw new UnknownHostException ("no scope_id found");
	}

	private int deriveNumericScope (String ifname) throws UnknownHostException {
	Enumeration<NetworkInterface> en;
	try {
	en = NetworkInterface.getNetworkInterfaces();
	} catch (SocketException e) {
	throw new UnknownHostException ("could not enumerate local network interfaces");
	}
	while (en.hasMoreElements()) {
	NetworkInterface ifc = en.nextElement();
	if (ifc.getName().equals (ifname)) {
	return deriveNumericScope(holder6.ipaddress, ifc);
	}
	}
	throw new UnknownHostException ("No matching address found for interface : " +ifname);
	}

	/**
	* @serialField ipaddress byte[] holds a 128-bit (16 bytes) IPv6 address
	* @serialField scope_id int the address scope id. {@code 0} if undefined
	* @serialField scope_id_set boolean {@code true} when the scope_id field
	* contains a valid integer scope_id
	* @serialField scope_ifname_set boolean {@code true} if the object is
	* constructed with a scoped interface instead of a numeric
	* scope id
	* @serialField ifname String the name of the scoped network interface.
	* {@code null} if undefined
	*/
	@java.io.Serial
	private static final ObjectStreamField[] serialPersistentFields = {
	new ObjectStreamField("ipaddress", byte[].class),
	new ObjectStreamField("scope_id", int.class),
	new ObjectStreamField("scope_id_set", boolean.class),
	new ObjectStreamField("scope_ifname_set", boolean.class),
	new ObjectStreamField("ifname", String.class)
	};

	private static final jdk.internal.misc.Unsafe UNSAFE
	= jdk.internal.misc.Unsafe.getUnsafe();
	private static final long FIELDS_OFFSET = UNSAFE.objectFieldOffset(
	Inet6Address.class, "holder6");

	/**
	* Restores the state of this object from the stream.
	* This includes the scope information, but only if the
	* scoped interface name is valid on this system.
	*
	* @param s the {@code ObjectInputStream} from which data is read
	* @throws IOException if an I/O error occurs
	* @throws ClassNotFoundException if a serialized class cannot be loaded
	*/
	@java.io.Serial
	private void readObject(ObjectInputStream s)
	throws IOException, ClassNotFoundException {
	NetworkInterface scope_ifname = null;

	if (getClass().getClassLoader() != null) {
	throw new SecurityException ("invalid address type");
	}

	ObjectInputStream.GetField gf = s.readFields();
	byte[] ipaddress = (byte[])gf.get("ipaddress", new byte[0]);
	int scope_id = gf.get("scope_id", -1);
	boolean scope_id_set = gf.get("scope_id_set", false);
	boolean scope_ifname_set = gf.get("scope_ifname_set", false);
	String ifname = (String)gf.get("ifname", null);

	if (ifname != null && !ifname.isEmpty()) {
	try {
	scope_ifname = NetworkInterface.getByName(ifname);
	if (scope_ifname == null) {
	/* the interface does not exist on this system, so we clear
	* the scope information completely */
	scope_id_set = false;
	scope_ifname_set = false;
	scope_id = 0;
	} else {
	scope_ifname_set = true;
	try {
	scope_id = deriveNumericScope (ipaddress, scope_ifname);
	} catch (UnknownHostException e) {
	// typically should not happen, but it may be that
	// the machine being used for deserialization has
	// the same interface name but without IPv6 configured.
	}
	}
	} catch (SocketException e) {}
	}

	/* if ifname was not supplied, then the numeric info is used */

	ipaddress = ipaddress.clone();

	// Check that our invariants are satisfied
	if (ipaddress.length != INADDRSZ) {
	throw new InvalidObjectException("invalid address length: "+
	ipaddress.length);
	}

	if (holder.getFamily() != IPv6) {
	throw new InvalidObjectException("invalid address family type");
	}

	Inet6AddressHolder h = new Inet6AddressHolder(
	ipaddress, scope_id, scope_id_set, scope_ifname, scope_ifname_set
	);

	UNSAFE.putReference(this, FIELDS_OFFSET, h);
	}

	/**
	* The default behavior of this method is overridden in order to
	* write the scope_ifname field as a {@code String}, rather than a
	* {@code NetworkInterface} which is not serializable.
	*
	* @param s the {@code ObjectOutputStream} to which data is written
	* @throws IOException if an I/O error occurs
	*/
	@java.io.Serial
	private synchronized void writeObject(ObjectOutputStream s)
	throws IOException
	{
	String ifname = null;

	if (holder6.scope_ifname != null) {
	ifname = holder6.scope_ifname.getName();
	holder6.scope_ifname_set = true;
	}
	ObjectOutputStream.PutField pfields = s.putFields();
	pfields.put("ipaddress", holder6.ipaddress);
	pfields.put("scope_id", holder6.scope_id);
	pfields.put("scope_id_set", holder6.scope_id_set);
	pfields.put("scope_ifname_set", holder6.scope_ifname_set);
	pfields.put("ifname", ifname);
	s.writeFields();
	}

	/**
	* Utility routine to check if the InetAddress is an IP multicast
	* address. 11111111 at the start of the address identifies the
	* address as being a multicast address.
	*
	* @return a {@code boolean} indicating if the InetAddress is an IP
	* multicast address
	*/
	@Override
	public boolean isMulticastAddress() {
	return holder6.isMulticastAddress();
	}

	/**
	* Utility routine to check if the InetAddress is a wildcard address.
	*
	* @return a {@code boolean} indicating if the InetAddress is
	* a wildcard address.
	*/
	@Override
	public boolean isAnyLocalAddress() {
	return holder6.isAnyLocalAddress();
	}

	/**
	* Utility routine to check if the InetAddress is a loopback address.
	*
	* @return a {@code boolean} indicating if the InetAddress is a loopback
	* address; or false otherwise.
	*/
	@Override
	public boolean isLoopbackAddress() {
	return holder6.isLoopbackAddress();
	}

	/**
	* Utility routine to check if the InetAddress is an link local address.
	*
	* @return a {@code boolean} indicating if the InetAddress is a link local
	* address; or false if address is not a link local unicast address.
	*/
	@Override
	public boolean isLinkLocalAddress() {
	return holder6.isLinkLocalAddress();
	}

	/* static version of above */
	static boolean isLinkLocalAddress(byte[] ipaddress) {
	return ((ipaddress[0] & 0xff) == 0xfe
	&& (ipaddress[1] & 0xc0) == 0x80);
	}

	/**
	* Utility routine to check if the InetAddress is a site local address.
	*
	* @return a {@code boolean} indicating if the InetAddress is a site local
	* address; or false if address is not a site local unicast address.
	*/
	@Override
	public boolean isSiteLocalAddress() {
	return holder6.isSiteLocalAddress();
	}

	/* static version of above */
	static boolean isSiteLocalAddress(byte[] ipaddress) {
	return ((ipaddress[0] & 0xff) == 0xfe
	&& (ipaddress[1] & 0xc0) == 0xc0);
	}

	/**
	* Utility routine to check if the multicast address has global scope.
	*
	* @return a {@code boolean} indicating if the address has is a multicast
	* address of global scope, false if it is not of global scope or
	* it is not a multicast address
	*/
	@Override
	public boolean isMCGlobal() {
	return holder6.isMCGlobal();
	}

	/**
	* Utility routine to check if the multicast address has node scope.
	*
	* @return a {@code boolean} indicating if the address has is a multicast
	* address of node-local scope, false if it is not of node-local
	* scope or it is not a multicast address
	*/
	@Override
	public boolean isMCNodeLocal() {
	return holder6.isMCNodeLocal();
	}

	/**
	* Utility routine to check if the multicast address has link scope.
	*
	* @return a {@code boolean} indicating if the address has is a multicast
	* address of link-local scope, false if it is not of link-local
	* scope or it is not a multicast address
	*/
	@Override
	public boolean isMCLinkLocal() {
	return holder6.isMCLinkLocal();
	}

	/**
	* Utility routine to check if the multicast address has site scope.
	*
	* @return a {@code boolean} indicating if the address has is a multicast
	* address of site-local scope, false if it is not of site-local
	* scope or it is not a multicast address
	*/
	@Override
	public boolean isMCSiteLocal() {
	return holder6.isMCSiteLocal();
	}

	/**
	* Utility routine to check if the multicast address has organization scope.
	*
	* @return a {@code boolean} indicating if the address has is a multicast
	* address of organization-local scope, false if it is not of
	* organization-local scope or it is not a multicast address
	*/
	@Override
	public boolean isMCOrgLocal() {
	return holder6.isMCOrgLocal();
	}

	/**
	* Returns the raw IP address of this {@code InetAddress} object. The result
	* is in network byte order: the highest order byte of the address is in
	* {@code getAddress()[0]}.
	*
	* @return the raw IP address of this object.
	*/
	@Override
	public byte[] getAddress() {
	return holder6.ipaddress.clone();
	}

	/**
	* Returns a reference to the byte[] with the IPv6 address.
	*/
	byte[] addressBytes() {
	return holder6.ipaddress;
	}

	/**
	* Returns the numeric scopeId, if this instance is associated with
	* an interface. If no scoped_id is set, the returned value is zero.
	*
	* @return the scopeId, or zero if not set.
	*
	* @since 1.5
	*/
	public int getScopeId() {
	return holder6.scope_id;
	}

	/**
	* Returns the scoped interface, if this instance was created with
	* a scoped interface.
	*
	* @return the scoped interface, or null if not set.
	* @since 1.5
	*/
	public NetworkInterface getScopedInterface() {
	return holder6.scope_ifname;
	}

	/**
	* Returns the IP address string in textual presentation. If the instance
	* was created specifying a scope identifier then the scope id is appended
	* to the IP address preceded by a "%" (per-cent) character. This can be
	* either a numeric value or a string, depending on which was used to create
	* the instance.
	*
	* @return the raw IP address in a string format.
	*/
	@Override
	public String getHostAddress() {
	return holder6.getHostAddress();
	}

	/**
	* Returns a hashcode for this IP address.
	*
	* @return a hash code value for this IP address.
	*/
	@Override
	public int hashCode() {
	return holder6.hashCode();
	}

	/**
	* Compares this object against the specified object. The result is {@code
	* true} if and only if the argument is not {@code null} and it represents
	* the same IP address as this object.
	*
	* <p> Two instances of {@code InetAddress} represent the same IP address
	* if the length of the byte arrays returned by {@code getAddress} is the
	* same for both, and each of the array components is the same for the byte
	* arrays.
	*
	* @param obj the object to compare against.
	*
	* @return {@code true} if the objects are the same; {@code false} otherwise.
	*
	* @see java.net.InetAddress#getAddress()
	*/
	@Override
	public boolean equals(Object obj) {
	if (obj instanceof Inet6Address inetAddr) {
	return holder6.equals(inetAddr.holder6);
	}
	return false;
	}

	/**
	* Utility routine to check if the InetAddress is an
	* IPv4 compatible IPv6 address.
	*
	* @return a {@code boolean} indicating if the InetAddress is an IPv4
	* compatible IPv6 address; or false if address is IPv4 address.
	*/
	public boolean isIPv4CompatibleAddress() {
	return holder6.isIPv4CompatibleAddress();
	}

	// Utilities

	private static final int INT16SZ = 2;

	/**
	* Convert IPv6 binary address into presentation (printable) format.
	*
	* @param src a byte array representing the IPv6 numeric address
	* @return a String representing an IPv6 address in
	* textual representation format
	*/
	static String numericToTextFormat(byte[] src) {
	StringBuilder sb = new StringBuilder(39);
	for (int i = 0; i < (INADDRSZ / INT16SZ); i++) {
	sb.append(Integer.toHexString(((src[i<<1]<<8) & 0xff00)
	\| (src[(i<<1)+1] & 0xff)));
	if (i < (INADDRSZ / INT16SZ) -1 ) {
	sb.append(":");
	}
	}
	return sb.toString();
	}

	/**
	* Perform class load-time initializations.
	*/
	private static native void init();
	}

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