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/*
 * Copyright 2016 Carlos Ballesteros Velasco
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package java.net;

import libcore.io.Memory;

import java.io.ObjectStreamException;
import java.nio.ByteOrder;

public final class Inet4Address extends InetAddress {
	/**
	 * @hide
	 */
	public static final InetAddress ANY =
		new Inet4Address(new byte[]{0, 0, 0, 0}, null);

	/**
	 * @hide
	 */
	public static final InetAddress ALL =
		new Inet4Address(new byte[]{(byte) 255, (byte) 255,
			(byte) 255, (byte) 255}, null);

	/**
	 * @hide
	 */
	public static final InetAddress LOOPBACK =
		new Inet4Address(new byte[]{127, 0, 0, 1}, "localhost");

	Inet4Address(byte[] ipaddress, String hostName) {
		super(AF_INET, ipaddress, hostName);
	}

	@Override
	public boolean isAnyLocalAddress() {
		return ipaddress[0] == 0 && ipaddress[1] == 0 && ipaddress[2] == 0 && ipaddress[3] == 0; // 0.0.0.0
	}

	@Override
	public boolean isLinkLocalAddress() {
		// The RI does not return true for loopback addresses even though RFC 3484 says to do so.
		return ((ipaddress[0] & 0xff) == 169) && ((ipaddress[1] & 0xff) == 254); // 169.254/16
	}

	@Override
	public boolean isLoopbackAddress() {
		return ((ipaddress[0] & 0xff) == 127); // 127/8
	}

	@Override
	public boolean isMCGlobal() {
		// Check if we have a prefix of 1110
		if (!isMulticastAddress()) {
			return false;
		}

		int address = Memory.peekInt(ipaddress, 0, ByteOrder.BIG_ENDIAN);
		/*
         * Now check the boundaries of the global space if we have an address
         * that is prefixed by something less than 111000000000000000000001
         * (fortunately we don't have to worry about sign after shifting 8 bits
         * right) it is not multicast. ( < 224.0.1.0)
         */
		if (address >>> 8 < 0xE00001) {
			return false;
		}

        /*
         * Now check the high boundary which is prefixed by 11101110 = 0xEE. If
         * the value is higher than this than it is not MCGlobal ( >
         * 238.255.255.255 )
         */
		if (address >>> 24 > 0xEE) {
			return false;
		}

		return true;
	}

	@Override
	public boolean isMCLinkLocal() {
		return ((ipaddress[0] & 0xff) == 224) && (ipaddress[1] == 0) && (ipaddress[2] == 0); // 224.0.0/24
	}

	@Override
	public boolean isMCNodeLocal() {
		return false;
	}

	@Override
	public boolean isMCOrgLocal() {
		return ((ipaddress[0] & 0xff) == 239) && ((ipaddress[1] & 0xfc) == 192); // 239.192/14
	}

	@Override
	public boolean isMCSiteLocal() {
		return ((ipaddress[0] & 0xff) == 239) && ((ipaddress[1] & 0xff) == 255); // 239.255/16
	}

	@Override
	public boolean isMulticastAddress() {
		return (ipaddress[0] & 0xf0) == 224; // 224/4
	}

	@Override
	public boolean isSiteLocalAddress() {
		if ((ipaddress[0] & 0xff) == 10) { // 10/8
			return true;
		} else if (((ipaddress[0] & 0xff) == 172) && ((ipaddress[1] & 0xf0) == 16)) { // 172.16/12
			return true;
		} else if (((ipaddress[0] & 0xff) == 192) && ((ipaddress[1] & 0xff) == 168)) { // 192.168/16
			return true;
		}
		return false;
	}

	private Object writeReplace() throws ObjectStreamException {
		return new Inet4Address(ipaddress, hostName);
	}
}