Crc64Helper.java

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/*******************************************************************************
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 * Copyright (c) 2009, 2012 Mountainminds GmbH & Co. KG and Contributors
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 * All rights reserved. This program and the accompanying materials
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 * are made available under the terms of the Eclipse Public License v1.0
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 * which accompanies this distribution, and is available at
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 * http://www.eclipse.org/legal/epl-v10.html
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 *
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 * Contributors:
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 *    Marc R. Hoffmann - initial API and implementation
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 *
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 *******************************************************************************/
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package com.jsql.util.bruter;
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/**
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 * CRC64 checksum calculator based on the polynom specified in ISO 3309. The
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 * implementation is based on the following publications:
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 *
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 * <ul>
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 * <li>http://en.wikipedia.org/wiki/Cyclic_redundancy_check</li>
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 * <li>http://www.geocities.com/SiliconValley/Pines/8659/crc.htm</li>
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 * </ul>
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 */
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public class Crc64Helper {
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    private static final long POLY64REV = 0xd800000000000000L;
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    private static final long[] LOOKUPTABLE;
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    private Crc64Helper() {
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        // Util class
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    }
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    static {
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        LOOKUPTABLE = new long[0x100];
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        for (int i = 0; i < 0x100; i++) {
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            long v = i;
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            for (int j = 0; j < 8; j++) {
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                if ((v & 1) == 1) {
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                    v = (v >>> 1) ^ Crc64Helper.POLY64REV;
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                } else {
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                    v = v >>> 1;
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                }
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            }
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            Crc64Helper.LOOKUPTABLE[i] = v;
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        }
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    }
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    /**
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     * Calculates the CRC64 checksum for the given data array.
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     *
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     * @param data
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     *            data to calculate checksum for
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     * @return checksum value
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     */
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    public static String generateCRC64(final byte[] data) {
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        long sum = 0;
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        for (byte element : data) {
58 2 1. generateCRC64 : Replaced XOR with AND → KILLED
2. generateCRC64 : Replaced bitwise AND with OR → KILLED
 
            final int lookupidx = ((int) sum ^ element) & 0xff;
59 2 1. generateCRC64 : Replaced Unsigned Shift Right with Shift Left → KILLED
2. generateCRC64 : Replaced XOR with AND → KILLED
 
            sum = (sum >>> 8) ^ Crc64Helper.LOOKUPTABLE[lookupidx];
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        }
61 1 1. generateCRC64 : replaced return value with "" for com/jsql/util/bruter/Crc64Helper::generateCRC64 → KILLED
 
        return String.valueOf(sum);
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    }
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}

Mutations

58

1.1
Location : generateCRC64
Killed by : StringUtilSpock.[engine:spock]/[spec:StringUtilSpock]/[feature:$spock_feature_0_0] Replaced XOR with AND → KILLED

2.2
Location : generateCRC64
Killed by : StringUtilSpock.[engine:spock]/[spec:StringUtilSpock]/[feature:$spock_feature_0_0] Replaced bitwise AND with OR → KILLED

59

1.1
Location : generateCRC64
Killed by : StringUtilSpock.[engine:spock]/[spec:StringUtilSpock]/[feature:$spock_feature_0_0] Replaced Unsigned Shift Right with Shift Left → KILLED

2.2
Location : generateCRC64
Killed by : StringUtilSpock.[engine:spock]/[spec:StringUtilSpock]/[feature:$spock_feature_0_0] Replaced XOR with AND → KILLED

61

1.1
Location : generateCRC64
Killed by : StringUtilSpock.[engine:spock]/[spec:StringUtilSpock]/[feature:$spock_feature_0_0] replaced return value with "" for com/jsql/util/bruter/Crc64Helper::generateCRC64 → KILLED

Active mutators

Tests examined


Report generated by PIT 1.19.1