Java CRC Calculate calculateCRC(String digitsToCheck)

Description

calculate CRC

License

Open Source License

Declaration

private static String calculateCRC(String digitsToCheck) 

Method Source Code

//package com.java2s;
/*/*from   w  w w  .  j  ava 2 s  .  c om*/
 * GovPay - Porta di Accesso al Nodo dei Pagamenti SPC 
 * http://www.gov4j.it/govpay
 * 
 * Copyright (c) 2014-2015 Link.it srl (http://www.link.it).
 * Copyright (c) 2014-2015 TAS S.p.A. (http://www.tasgroup.it).
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

public class Main {

    private static String calculateCRC(String digitsToCheck) {

        int sumOdd = 0;

        int sumEven = 0;

        for (int i = digitsToCheck.length() - 1; i >= 0; i--) {

            char c = digitsToCheck.charAt(i);

            Integer num = Integer.parseInt(Character.toString(c));

            if (isOdd(digitsToCheck.length() - i))
                sumOdd += num;
            else
                sumEven += num;
        }

        int sumTot = sumEven + (sumOdd * 3);

        int crcInt;

        for (crcInt = 0; ((sumTot + crcInt) % 10) != 0; crcInt++)
            ;

        return String.valueOf(crcInt);
    }

    private static boolean isOdd(int i) {

        return (i % 2) != 0;

    }
}

Related

1. calcCRC(final byte[] data)
2. calcCRC(int crc, byte[] bytes, int start, int len)
3. calculateCRC(byte[] buff, int count)
4. calculateCRC(byte[] data, int offset, int len)
5. calculateCRC(String id)
6. calculateCrc16(byte[] buffer)
7. calculateCRC32(byte[] buf, int off, int len)
8. computeCRC(InputStream in)