com.fasteasytrade.jrandtest.tests.Count8Bits Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of ports-jrandtest Show documentation
Fork from https://github.com/cryptopony/jrandtest
The newest version!
/*
 * Created on 03/02/2005
 *
 * JRandTest package
 *
 * Copyright (c) 2005, Zur Aougav, [email protected]
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without modification, 
 * are permitted provided that the following conditions are met:
 * 
 * Redistributions of source code must retain the above copyright notice, this list 
 * of conditions and the following disclaimer. 
 * 
 * Redistributions in binary form must reproduce the above copyright notice, this 
 * list of conditions and the following disclaimer in the documentation and/or 
 * other materials provided with the distribution. 
 * 
 * Neither the name of the JRandTest nor the names of its contributors may be 
 * used to endorse or promote products derived from this software without specific 
 * prior written permission. 
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR 
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package com.fasteasytrade.jrandtest.tests;

import java.util.Map;
import java.util.logging.Logger;

import com.fasteasytrade.jrandtest.utils.Format;
import com.fasteasytrade.jrandtest.utils.Stat;

/**
 * Counts consecutive 8-bit words. The sums and differences are reported.
 * Each of the four 8-bit words should appear 1/256 of the time.
 * 
 * @author Zur Aougav
 */

public class Count8Bits extends Base {

    final private Logger log = Logger.getLogger(getClass().getName());

    @Override
    public ResultStatus test(Map details) {
        final int no_seqs = 256;
        double[] v1 = new double[no_seqs]; // count each byte, 0 .. 255		
        long length = 0;

        rs.openInputStream();

        byte b;
        int temp;

        while (true) {
            b = rs.readByte();
            if (!rs.isOpen()) {
                break;
            }
            length++;

            temp = 0xff & b;
            v1[temp]++; // increment counter
        }

        rs.closeInputStream();

        double pv = Stat.KStest(v1, no_seqs);
        log.info("\t ks test for " + no_seqs + " p's: " + Format.d4(pv) + "\n");

        long k = length / v1.length;
        log.info("\n\t found " + length + " 8 bits / 1 byte.");

        //printf("\n\t count 8 bits / 1 byte. Should be: " + k);
        log.info("\n\t expected avg for 8 bits / 1 byte: " + k);
        log.info("\n\t found avg for 8 bits / 1 byte: " + (long)Stat.avg(v1));

        double t = Stat.stdev(v1, k);
        log.info("\n\t stdev for 1 byte\t: " + Format.d4(t));
        log.info("\n\t % stdev for 1 byte\t: %" + Format.d4(100.00 * t / k));
        log.info("\n\t chitest for 1 byte\t: " + Format.d4(Stat.chitest(v1, k)));
        log.info("\n\t r2 for 1 byte\t\t: " + Format.d4(Stat.r2_double(v1)));

        return ResultStatus.UNKNOWN;
    }

}