[Arianne-commits] unrelated-stuff/src/net/sf/arianne/tools/ipcalc IPCalc.java, NONE, 1.1

[Hendrik B. <nh...@us...>]

Update of /cvsroot/arianne/unrelated-stuff/src/net/sf/arianne/tools/ipcalc
In directory sfp-cvsdas-1.v30.ch3.sourceforge.com:/tmp/cvs-serv31108/src/net/sf/arianne/tools/ipcalc

Added Files:
	IPCalc.java 
Log Message:
converting ipaddress to hexadecimal and back

--- NEW FILE: IPCalc.java ---
package net.sf.arianne.tools.ipcalc;

/**
 * IP address calculator.
 *
 * @author hendrik
 */
public class IPCalc {

	/**
	 * adds some leading '0' to the sting until the length <i>maxDigits</i> is
	 * reached
	 * 
	 * @param number
	 *            the number to convert
	 * @param maxDigits
	 *            the amount of digits expected
	 * @return the expected number
	 */
	public static String addLeadingZeros(String number, int maxDigits) {
		StringBuilder result = new StringBuilder(number);

		while (result.length() < maxDigits) {
			result.insert(0, "0");
		}

		return result.toString();
	}


	private static String ipToHex(String address) {
		String[] tokens = address.split("\\.");
		StringBuilder res = new StringBuilder();
		for (String token : tokens) {
			res.append(addLeadingZeros(Integer.toHexString(Integer.parseInt(token)), 2));
		}
		return res.toString();
	}


	private static String hexToIp(String address) {
		StringBuilder res = new StringBuilder();
		for (int i = 0; i < 3; i++) {
			res.append(Integer.parseInt(address.substring(i * 2, i * 2 + 1), 16));
			res.append(".");
		}
		return res.toString();
	}

	public static void main(String[] args) {

		if (args.length != 1) {
			System.out.println("Usage: " + IPCalc.class.getName() + " ip.ad.dre.ss | hexadecimal");
			System.exit(1);
		}

		String address = args[0];
		if (address.indexOf(".") > -1) {
			System.out.println(ipToHex(address));
		} else {
			System.out.println(hexToIp(address));
		}
	}

}