4dc2f71b90
2005-02-02 David Daney <ddaney@avtrex.com> * java/net/InetAddress.java (InetAddress): Make a private copy of the address. * java/net/Inet4Address.java (getAddress): Return a copy of the address. * java/net/Inet6Address.java (Inet6Address): Use private copy of the address (getAddress): Return a copy of the address. (equals): Rewrote. From-SVN: r94664
276 lines
6.3 KiB
Java
276 lines
6.3 KiB
Java
/* Inet4Address.java --
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Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.net;
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import java.io.ObjectStreamException;
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import java.util.Arrays;
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/*
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* Written using on-line Java Platform 1.4 API Specification and
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* RFC 1884 (http://www.ietf.org/rfc/rfc1884.txt),
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* RFC 1918 (http://www.ietf.org/rfc/rfc1918.txt),
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* RFC 2365 (http://www.ietf.org/rfc/rfc2365.txt)
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*
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* @author Michael Koch
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* @status Believed complete and correct.
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*/
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public final class Inet4Address extends InetAddress
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{
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/**
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* For compatability with Sun's JDK 1.4.2 rev. 5
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*/
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static final long serialVersionUID = 3286316764910316507L;
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/**
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* needed for serialization
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*/
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private Object writeReplace() throws ObjectStreamException
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{
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return new InetAddress(addr, hostName);
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}
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/**
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* Initializes this object's addr instance variable from the passed in
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* byte array. Note that this constructor is protected and is called
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* only by static methods in this class.
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*
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* @param addr The IP number of this address as an array of bytes
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* @param hostname The hostname of this IP address.
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*/
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Inet4Address(byte[] addr, String host)
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{
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super(addr, host);
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}
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/**
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* Checks if the address is a multicast address
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*
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* @since 1.1
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*/
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public boolean isMulticastAddress()
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{
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return (addr[0] & 0xF0) == 0xE0;
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}
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/**
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* Checks if this address is a loopback address
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*/
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public boolean isLoopbackAddress()
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{
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return addr[0] == 0x7F;
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}
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/**
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* Checks if this address is a wildcard address
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*
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* @since 1.4
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*/
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public boolean isAnyLocalAddress()
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{
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byte[] anylocal = { 0, 0, 0, 0 };
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return Arrays.equals(addr, anylocal);
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}
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/**
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* Checks if this address is a link local address
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*
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* @since 1.4
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*/
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public boolean isLinkLocalAddress()
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{
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// XXX: This seems to not exist with IPv4 addresses
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return false;
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}
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/**
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* Checks if this address is a site local address
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*
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* @since 1.4
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*/
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public boolean isSiteLocalAddress()
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{
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// 10.0.0.0/8
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if (addr[0] == 0x0A)
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return true;
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// XXX: Suns JDK 1.4.1 (on Linux) seems to have a bug here:
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// it says 172.16.0.0 - 172.255.255.255 are site local addresses
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//
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// 172.16.0.0/12
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if (addr[0] == 0xAC && (addr[1] & 0xF0) == 0x01)
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return true;
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// 192.168.0.0/16
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if (addr[0] == 0xC0 && addr[1] == 0xA8)
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return true;
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// XXX: Do we need to check more addresses here ?
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return false;
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}
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/**
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* Checks if this multicast address has global scope
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*
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* @since 1.4
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*/
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public boolean isMCGlobal()
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{
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// XXX: This seems to net exist with IPv4 addresses
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return false;
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}
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/**
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* Checks if this multicast address has node scope
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*
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* @since 1.4
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*/
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public boolean isMCNodeLocal()
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{
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// XXX: This seems to net exist with IPv4 addresses
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return false;
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}
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/**
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* Checks if this multicast address has link scope
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*
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* @since 1.4
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*/
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public boolean isMCLinkLocal()
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{
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if (! isMulticastAddress())
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return false;
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return (addr[0] == 0xE0) && (addr[1] == 0x00) && (addr[2] == 0x00);
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}
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/**
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* Checks if this multicast address has site scope
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*
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* @since 1.4
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*/
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public boolean isMCSiteLocal()
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{
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// XXX: This seems to net exist with IPv4 addresses
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return false;
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}
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/**
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* Checks if this multicast address has organization scope
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*
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* @since 1.4
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*/
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public boolean isMCOrgLocal()
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{
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// XXX: This seems to net exist with IPv4 addresses
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return false;
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}
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/**
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* Returns the address of the current instance
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*/
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public byte[] getAddress()
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{
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return (byte[]) addr.clone();
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}
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/**
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* Returns the address as string
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*
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* @since 1.0.2
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*/
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public String getHostAddress()
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{
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StringBuffer sbuf = new StringBuffer(40);
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int len = addr.length;
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int i = 0;
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for (;;)
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{
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sbuf.append(addr[i] & 0xFF);
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i++;
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if (i == len)
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break;
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sbuf.append('.');
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}
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return sbuf.toString();
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}
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/**
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* Computes the hashcode of the instance
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*/
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public int hashCode()
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{
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int hash = 0;
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int len = addr.length;
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int i = len > 4 ? len - 4 : 0;
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for (; i < len; i++)
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hash = (hash << 8) | (addr[i] & 0xFF);
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return hash;
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}
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/**
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* Compare the current Inet4Address instance with obj
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*
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* @param obj Object to compare with
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*/
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public boolean equals(Object obj)
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{
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if (! (obj instanceof InetAddress))
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return false;
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byte[] addr1 = addr;
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byte[] addr2 = ((InetAddress) obj).addr;
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if (addr1.length != addr2.length)
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return false;
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for (int i = addr1.length; --i >= 0;)
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if (addr1[i] != addr2[i])
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return false;
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return true;
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}
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} // class Inet4Address
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