ipaddress.java

java 文件下载器。可自定义

// Decompiled by Jad v1.5.8e2. Copyright 2001 Pavel Kouznetsov.
// Jad home page: http://kpdus.tripod.com/jad.html
// Decompiler options: packimports(3) fieldsfirst ansi space 
// Source File Name:   IPAddress.java

package org.bouncycastle.util;

import java.math.BigInteger;

public class IPAddress
{

	private static final BigInteger ZERO = BigInteger.valueOf(0L);

	public IPAddress()
	{
	}

	public static boolean isValid(String address)
	{
		return isValidIPv4(address) || isValidIPv6(address);
	}

	private static boolean isValidIPv4(String address)
	{
		if (address.length() == 0)
			return false;
		int octets = 0;
		String temp = (new StringBuilder()).append(address).append(".").toString();
		int pos;
		for (int start = 0; start < temp.length() && (pos = temp.indexOf('.', start)) > start;)
		{
			if (octets == 4)
				return false;
			BigInteger octet;
			try
			{
				octet = new BigInteger(temp.substring(start, pos));
			}
			catch (NumberFormatException ex)
			{
				return false;
			}
			if (octet.compareTo(ZERO) == -1 || octet.compareTo(BigInteger.valueOf(255L)) == 1)
				return false;
			start = pos + 1;
			octets++;
		}

		return octets == 4;
	}

	private static boolean isValidIPv6(String address)
	{
		if (address.length() == 0)
			return false;
		int octets = 0;
		String temp = (new StringBuilder()).append(address).append(":").toString();
		int pos;
		for (int start = 0; start < temp.length() && (pos = temp.indexOf(':', start)) > start;)
		{
			if (octets == 8)
				return false;
			BigInteger octet;
			try
			{
				octet = new BigInteger(temp.substring(start, pos), 16);
			}
			catch (NumberFormatException ex)
			{
				return false;
			}
			if (octet.compareTo(ZERO) == -1 || octet.compareTo(BigInteger.valueOf(65535L)) == 1)
				return false;
			start = pos + 1;
			octets++;
		}

		return octets == 8;
	}

}