Java BitSet validateEncoded(BitSet encoded, int encodedBitLength)

Description

validate Encoded

License

Open Source License

Declaration

private static boolean validateEncoded(BitSet encoded,
            int encodedBitLength) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.util.BitSet;

public class Main {
    private static boolean validateEncoded(BitSet encoded,
            int encodedBitLength) {
        int errorSyndromeLength = (int) (Math.log(encodedBitLength) / Math
                .log(2)) + 1;//from www.j a v  a2 s . c o  m
        BitSet errorSyndrome = new BitSet(errorSyndromeLength);

        for (int bitmask = 1, j = 0; j < errorSyndromeLength; bitmask <<= 1, ++j) {
            int countOfBits = 0;
            for (int i = bitmask; i <= encodedBitLength; ++i) {
                if ((i & bitmask) != 0) {
                    countOfBits += (encoded.get(encodedBitLength - i) ? 1
                            : 0);
                }
            }
            countOfBits %= 2;
            errorSyndrome.set(j, countOfBits != 0);
        }

        return errorSyndrome.length() == 0;
    }
}

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