/* TEMPLATE GENERATED TESTCASE FILE
Filename: CWE369_Divide_by_Zero__int_random_modulo_42.java
Label Definition File: CWE369_Divide_by_Zero__int.label.xml
Template File: sources-sinks-42.tmpl.java
*/
/*
 * @description
 * CWE: 369 Divide by zero
 * BadSource: random Set data to a random value
 * GoodSource: A hardcoded non-zero, non-min, non-max, even number
 * Sinks: modulo
 *    GoodSink: Check for zero before modulo
 *    BadSink : Modulo by a value that may be zero
 * Flow Variant: 42 Data flow: data returned from one method to another in the same class
 *
 * */






import java.security.SecureRandom;

public class CWE369_Divide_by_Zero__int_random_modulo_42 extends AbstractTestCase
{
    private int badSource() throws Throwable
    {
        int data;

        /* POTENTIAL FLAW: Set data to a random value */
        data = (new SecureRandom()).nextInt();

        return data;
    }

    public void bad() throws Throwable
    {
        int data = badSource();

        /* POTENTIAL FLAW: Zero modulus will cause an issue.  An integer division will
        result in an exception.  */
        IO.writeLine("100%" + data + " = " + (100 % data) + "\n");

    }

    /* goodG2B() - use goodsource and badsink */
    private int goodG2BSource() throws Throwable
    {
        int data;

        /* FIX: Use a hardcoded number that won't cause underflow, overflow, divide by zero, or loss-of-precision issues */
        data = 2;

        return data;
    }

    private void goodG2B() throws Throwable
    {
        int data = goodG2BSource();

        /* POTENTIAL FLAW: Zero modulus will cause an issue.  An integer division will
        result in an exception.  */
        IO.writeLine("100%" + data + " = " + (100 % data) + "\n");

    }

    /* goodB2G() - use badsource and goodsink */
    private int goodB2GSource() throws Throwable
    {
        int data;

        /* POTENTIAL FLAW: Set data to a random value */
        data = (new SecureRandom()).nextInt();

        return data;
    }

    private void goodB2G() throws Throwable
    {
        int data = goodB2GSource();

        /* FIX: test for a zero modulus */
        if (data != 0)
        {
            IO.writeLine("100%" + data + " = " + (100 % data) + "\n");
        }
        else
        {
            IO.writeLine("This would result in a modulo by zero");
        }

    }

    public void good() throws Throwable
    {
        goodG2B();
        goodB2G();
    }

    /* Below is the main(). It is only used when building this testcase on
     * its own for testing or for building a binary to use in testing binary
     * analysis tools. It is not used when compiling all the testcases as one
     * application, which is how source code analysis tools are tested.
     */
    public static void main(String[] args) throws ClassNotFoundException,
           InstantiationException, IllegalAccessException
    {
        mainFromParent(args);
    }
}
