/* TEMPLATE GENERATED TESTCASE FILE
Filename: CWE190_Integer_Overflow__byte_rand_multiply_21.java
Label Definition File: CWE190_Integer_Overflow.label.xml
Template File: sources-sinks-21.tmpl.java
*/
/*
 * @description
 * CWE: 190 Integer Overflow
 * BadSource: rand Set data to result of rand()
 * GoodSource: A hardcoded non-zero, non-min, non-max, even number
 * Sinks: multiply
 *    GoodSink: Ensure there will not be an overflow before multiplying data by 2
 *    BadSink : If data is positive, multiply by 2, which can cause an overflow
 * Flow Variant: 21 Control flow: Flow controlled by value of a private variable. All functions contained in one file.
 *
 * */






public class CWE190_Integer_Overflow__byte_rand_multiply_21 extends AbstractTestCase
{
    /* The variable below is used to drive control flow in the sink function */
    private boolean badPrivate = false;

    public void bad() throws Throwable
    {
        byte data;

        /* POTENTIAL FLAW: Use a random value */
        data = (byte)((new java.security.SecureRandom()).nextInt(1+Byte.MAX_VALUE-Byte.MIN_VALUE) + Byte.MIN_VALUE);

        badPrivate = true;
        badSink(data );
    }

    private void badSink(byte data ) throws Throwable
    {
        if (badPrivate)
        {
            if(data > 0) /* ensure we won't have an underflow */
            {
                /* POTENTIAL FLAW: if (data*2) > Byte.MAX_VALUE, this will overflow */
                byte result = (byte)(data * 2);
                IO.writeLine("result: " + result);
            }
        }
    }

    /* The variables below are used to drive control flow in the sink functions. */
    private boolean goodB2G1Private = false;
    private boolean goodB2G2Private = false;
    private boolean goodG2BPrivate = false;

    public void good() throws Throwable
    {
        goodB2G1();
        goodB2G2();
        goodG2B();
    }

    /* goodB2G1() - use BadSource and GoodSink by setting the variable to false instead of true */
    private void goodB2G1() throws Throwable
    {
        byte data;

        /* POTENTIAL FLAW: Use a random value */
        data = (byte)((new java.security.SecureRandom()).nextInt(1+Byte.MAX_VALUE-Byte.MIN_VALUE) + Byte.MIN_VALUE);

        goodB2G1Private = false;
        goodB2G1Sink(data );
    }

    private void goodB2G1Sink(byte data ) throws Throwable
    {
        if (goodB2G1Private)
        {
            /* INCIDENTAL: CWE 561 Dead Code, the code below will never run */
            IO.writeLine("Benign, fixed string");
        }
        else
        {

            if(data > 0) /* ensure we won't have an underflow */
            {
                /* FIX: Add a check to prevent an overflow from occurring */
                if (data < (Byte.MAX_VALUE/2))
                {
                    byte result = (byte)(data * 2);
                    IO.writeLine("result: " + result);
                }
                else
                {
                    IO.writeLine("data value is too large to perform multiplication.");
                }
            }

        }
    }

    /* goodB2G2() - use BadSource and GoodSink by reversing the blocks in the if in the sink function */
    private void goodB2G2() throws Throwable
    {
        byte data;

        /* POTENTIAL FLAW: Use a random value */
        data = (byte)((new java.security.SecureRandom()).nextInt(1+Byte.MAX_VALUE-Byte.MIN_VALUE) + Byte.MIN_VALUE);

        goodB2G2Private = true;
        goodB2G2Sink(data );
    }

    private void goodB2G2Sink(byte data ) throws Throwable
    {
        if (goodB2G2Private)
        {
            if(data > 0) /* ensure we won't have an underflow */
            {
                /* FIX: Add a check to prevent an overflow from occurring */
                if (data < (Byte.MAX_VALUE/2))
                {
                    byte result = (byte)(data * 2);
                    IO.writeLine("result: " + result);
                }
                else
                {
                    IO.writeLine("data value is too large to perform multiplication.");
                }
            }
        }
    }

    /* goodG2B() - use GoodSource and BadSink */
    private void goodG2B() throws Throwable
    {
        byte data;

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

        goodG2BPrivate = true;
        goodG2BSink(data );
    }

    private void goodG2BSink(byte data ) throws Throwable
    {
        if (goodG2BPrivate)
        {
            if(data > 0) /* ensure we won't have an underflow */
            {
                /* POTENTIAL FLAW: if (data*2) > Byte.MAX_VALUE, this will overflow */
                byte result = (byte)(data * 2);
                IO.writeLine("result: " + result);
            }
        }
    }

    /* 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);
    }
}
