ParityChecksum.java Source code

Introduction

Here is the source code for ParityChecksum.java

Source

import java.util.zip.Checksum;

public class ParityChecksum implements Checksum {
    long checksum = 0;

    public void update(int b) {
        int numOneBits = 0;
        for (int i = 1; i < 256; i *= 2) {
            if ((b & i) != 0)
                numOneBits++;
        }
        checksum = (checksum + numOneBits) % 2;
    }

    public void update(byte data[], int offset, int length) {
        for (int i = offset; i < offset + length; i++) {
            this.update(data[i]);
        }
    }

    public long getValue() {
        return checksum;
    }

    public void reset() {
        checksum = 0;
    }
}