Java BitSet check(BitSet originalMessage, int messageLength, BitSet polynomial, int polynomialLength)

Description

check

License

Open Source License

Declaration

public static BitSet check(BitSet originalMessage, int messageLength, BitSet polynomial, int polynomialLength) 

Method Source Code

//package com.java2s;
/*******************************************************************************
 *     SDR Trunk /*ww  w.ja v  a  2s.  com*/
 *     Copyright (C) 2014 Dennis Sheirer
 * 
 *     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/>
 ******************************************************************************/

import java.util.BitSet;

public class Main {
    public static BitSet check(BitSet originalMessage, int messageLength, BitSet polynomial, int polynomialLength) {
        //Make a copy of the message, since we're going to modify it
        BitSet copy = originalMessage.get(0, messageLength);

        //Iterate through the message bits
        for (int x = 0; x < messageLength; x++) {
            //If we're aligned against a starting 1 in the message, divide it
            if (copy.get(0)) {
                copy.xor(polynomial);
            }

            //Left shift the message
            copy = copy.get(1, messageLength + polynomialLength - x);
        }

        return copy.get(0, polynomialLength);
    }
}

Related

1. byte2BitSet(BitSet bmap, byte[] b, int bitOffset)
2. byteArray2BitSet(byte[] bytes)
3. bytes2bitset(byte[] bytes, byte nbyte, BitSet bits)
4. bytesToBits(byte[] b, BitSet ba, int maxSize)
5. cardinalityOf(BitSet bs)
6. checkValidCharOnly(BitSet validChars, String value)
7. clear(BitSet bitSet_)
8. combine(int length, BitSet... bitsets)
9. compare(BitSet a, BitSet b)