content: /*
   * Copyright (C) 2014 The Android Open Source Project
   * Copyright (c) 2000, 2013, 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;
  import libcore.io.Libcore;
  import static android.system.OsConstants.*;
  
  /**
   * This class represents an Internet Protocol version 6 (IPv6) address.
   * Defined by <a href="http://www.ietf.org/rfc/rfc2373.txt">
   * <i>RFC&nbsp;2373: IP Version 6 Addressing Architecture</i></a>.
   *
   * <h3> <A NAME="format">Textual representation of IP addresses</a> </h3>
   *
   * Textual representation of IPv6 address used as input to methods
   * takes one of the following forms:
   *
   * <ol>
   *   <li><p> <A NAME="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><table cellpadding=0 cellspacing=0 summary="layout">
   *   <tr><td>{@code 1080:0:0:0:8:800:200C:417A}<td></tr>
   *   </table></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><table cellpadding=0 cellspacing=0 summary="layout">
   *   <tr><td>{@code 1080::8:800:200C:417A}<td></tr>
   *   </table></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><table cellpadding=0 cellspacing=0 summary="layout">
   *   <tr><td>{@code ::FFFF:129.144.52.38}<td></tr>
   *   <tr><td>{@code ::129.144.52.38}<td></tr>
   *   </table></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><table cellpadding=0 cellspacing=0 summary="layout">
   *   <tr><td>{@code ::FFFF:d.d.d}<td></tr>
   *   <tr><td>{@code ::FFFF:d.d}<td></tr>
   *   <tr><td>{@code ::d.d.d}<td></tr>
   *   <tr><td>{@code ::d.d}<td></tr>
   *   </table></blockquote>
   *
   *   <p> The following form:
   *
   *   <blockquote><table cellpadding=0 cellspacing=0 summary="layout">
   *   <tr><td>{@code ::FFFF:d}<td></tr>
   *   </table></blockquote>
   *
   *   <p> is valid, however it is an unconventional representation of
   *   the IPv4-compatible IPv6 address,
   *
   *   <blockquote><table cellpadding=0 cellspacing=0 summary="layout">
   *   <tr><td>{@code ::255.255.0.d}<td></tr>
   *   </table></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.
   *
   * <h4> Special IPv6 address </h4>
   *
   * <blockquote>
   * <table cellspacing=2 summary="Description of IPv4-mapped address">
   * <tr><th valign=top><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>
   *
   * <h4><A NAME="scoped">Textual representation of IPv6 scoped addresses</a></h4>
   *
   * <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 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 {
      final static int INADDRSZ = 16;
  
      // BEGIN Android-removed: Remove special handling for link-local addresses
      /*
      * cached scope_id - for link-local address use only.
      *
      private transient int cached_scope_id;  // 0
      */
      // END Android-removed: Remove special handling for link-local addresses
  
      // BEGIN Android-added: Define special-purpose IPv6 address
      /** @hide */
      public static final InetAddress ANY =
              new Inet6Address("::", new byte[] {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, 0);
  
      /** @hide */
      public static final InetAddress LOOPBACK = new Inet6Address("ip6-localhost",
              new byte[] {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1}, 0);
      // END Android-added: Define special-purpose IPv6 address
  
      private 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);
  
              // Android-changed: was >= 0
              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;
              }
          }
  
          // Android-removed: getnameinfo returns smarter representations than getHostAddress()
          /*
          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)) {
                  return false;
              }
              Inet6AddressHolder that = (Inet6AddressHolder)o;
  
              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;
  
      private static final long serialVersionUID = 6880410070516793377L;
  
      // BEGIN Android-removed: Android doesn't need to call native init
      /*
      // Perform native initialization
      static { init(); }
      // END Android-removed: Android doesn't need to call native init
      */
  
      Inet6Address() {
          super();
          holder.init(null, AF_INET6);
          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, AF_INET6);
          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 (eg. 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.length() > 0 && 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.length() > 0 && 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 = AF_INET6;
          }
          holder.init(hostName, family);
      }
  
      /* check the two Ipv6 addresses and return false if they are both
       * non global address types, but not the same.
       * (ie. one is sitelocal and the other linklocal)
       * 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)) {
                  continue;
              }
              Inet6Address ia6_addr = (Inet6Address)addr;
              /* 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[]
       * @serialField scope_id int
       * @serialField scope_id_set boolean
       * @serialField scope_ifname_set boolean
       * @serialField ifname String
       */
  
      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 long FIELDS_OFFSET;
      private static final sun.misc.Unsafe UNSAFE;
  
      static {
          try {
              sun.misc.Unsafe unsafe = sun.misc.Unsafe.getUnsafe();
              FIELDS_OFFSET = unsafe.objectFieldOffset(
                      Inet6Address.class.getDeclaredField("holder6"));
              UNSAFE = unsafe;
          } catch (ReflectiveOperationException e) {
              throw new Error(e);
          }
      }
  
      /**
       * restore the state of this object from stream
       * including the scope information, only if the
       * scoped interface name is valid on this system
       */
      private void readObject(ObjectInputStream s)
          throws IOException, ClassNotFoundException {
          NetworkInterface scope_ifname = null;
  
          // Android-changed: was getClass().getClassLoader() != null
          if (getClass().getClassLoader() != Class.class.getClassLoader()) {
              throw new SecurityException ("invalid address type");
          }
  
          ObjectInputStream.GetField gf = s.readFields();
          byte[] ipaddress = (byte[])gf.get("ipaddress", null);
          int scope_id = (int)gf.get("scope_id", -1);
          boolean scope_id_set = (boolean)gf.get("scope_id_set", false);
          boolean scope_ifname_set = (boolean)gf.get("scope_ifname_set", false);
          String ifname = (String)gf.get("ifname", null);
  
          if (ifname != null && !"".equals (ifname)) {
              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() != AF_INET6) {
              throw new InvalidObjectException("invalid address family type");
          }
  
          Inet6AddressHolder h = new Inet6AddressHolder(
              ipaddress, scope_id, scope_id_set, scope_ifname, scope_ifname_set
          );
  
          UNSAFE.putObject(this, FIELDS_OFFSET, h);
      }
  
      /**
       * default behavior is overridden in order to write the
       * scope_ifname field as a String, rather than a NetworkInterface
       * which is not serializable
       */
      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
       *
       * @since JDK1.1
       */
      @Override
      public boolean isMulticastAddress() {
          return holder6.isMulticastAddress();
      }
  
      /**
       * Utility routine to check if the InetAddress in a wildcard address.
       *
       * @return a {@code boolean} indicating if the Inetaddress is
       *         a wildcard address.
       *
       * @since 1.4
       */
      @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.
       *
       * @since 1.4
       */
      @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.
       *
       * @since 1.4
       */
      @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.
       *
       * @since 1.4
       */
      @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
       *
       * @since 1.4
       */
      @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
       *
       * @since 1.4
       */
      @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
       *
       * @since 1.4
       */
      @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
       *
       * @since 1.4
       */
      @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
       *
       * @since 1.4
       */
      @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 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
       * 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() {
          // Android-changed: getnameinfo returns smarter representations than getHostAddress()
          // return holder6.getHostAddress();
          return Libcore.os.getnameinfo(this, NI_NUMERICHOST); // Can't throw.
      }
  
      /**
       * 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     InetAddress#getAddress()
       */
      @Override
      public boolean equals(Object obj) {
          if (obj == null || !(obj instanceof Inet6Address))
              return false;
  
          Inet6Address inetAddr = (Inet6Address)obj;
  
          return holder6.equals(inetAddr.holder6);
      }
  
      /**
       * 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.
       *
       * @since 1.4
       */
      public boolean isIPv4CompatibleAddress() {
          return holder6.isIPv4CompatibleAddress();
      }
  
      // Utilities
      private final static 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
       * @since 1.4
       */
      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();
      }
  
      // BEGIN Android-removed: Android doesn't need to call native init
      /*
       * Perform class load-time initializations.
       *
      private static native void init();
      */
      // END Android-removed: Android doesn't need to call native init
  }
  