/* TEMPLATE GENERATED TESTCASE FILE
Filename: CWE191_Integer_Underflow__short_min_predec_15.java
Label Definition File: CWE191_Integer_Underflow.label.xml
Template File: sources-sinks-15.tmpl.java
*/
/*
* @description
* CWE: 191 Integer Underflow
* BadSource: min Set data to the max value for short
* GoodSource: A hardcoded non-zero, non-min, non-max, even number
* Sinks: decrement
*    GoodSink: Ensure there will not be an underflow before decrementing data
*    BadSink : Decrement data, which can cause an Underflow
* Flow Variant: 15 Control flow: switch(6) and switch(7)
*
* */

package testcases.CWE191_Integer_Underflow.s05;
import testcasesupport.*;

public class CWE191_Integer_Underflow__short_min_predec_15 extends AbstractTestCase
{
    public void bad() throws Throwable
    {
        short data;

        switch (6)
        {
        case 6:
            /* POTENTIAL FLAW: Use the maximum size of the data type */
            data = Short.MIN_VALUE;
            break;
        default:
            /* INCIDENTAL: CWE 561 Dead Code, the code below will never run
             * but ensure data is inititialized before the Sink to avoid compiler errors */
            data = 0;
            break;
        }

        switch (7)
        {
        case 7:
            /* POTENTIAL FLAW: if data == Short.MIN_VALUE, this will overflow */
            short result = (short)(--data);
            IO.writeLine("result: " + result);
            break;
        default:
            /* INCIDENTAL: CWE 561 Dead Code, the code below will never run */
            IO.writeLine("Benign, fixed string");
            break;
        }
    }

    /* goodG2B1() - use goodsource and badsink by changing the first switch to switch(5) */
    private void goodG2B1() throws Throwable
    {
        short data;

        switch (5)
        {
        case 6:
            /* INCIDENTAL: CWE 561 Dead Code, the code below will never run
             * but ensure data is inititialized before the Sink to avoid compiler errors */
            data = 0;
            break;
        default:
            /* FIX: Use a hardcoded number that won't cause underflow, overflow, divide by zero, or loss-of-precision issues */
            data = 2;
            break;
        }

        switch (7)
        {
        case 7:
            /* POTENTIAL FLAW: if data == Short.MIN_VALUE, this will overflow */
            short result = (short)(--data);
            IO.writeLine("result: " + result);
            break;
        default:
            /* INCIDENTAL: CWE 561 Dead Code, the code below will never run */
            IO.writeLine("Benign, fixed string");
            break;
        }
    }

    /* goodG2B2() - use goodsource and badsink by reversing the blocks in the first switch  */
    private void goodG2B2() throws Throwable
    {
        short data;

        switch (6)
        {
        case 6:
            /* FIX: Use a hardcoded number that won't cause underflow, overflow, divide by zero, or loss-of-precision issues */
            data = 2;
            break;
        default:
            /* INCIDENTAL: CWE 561 Dead Code, the code below will never run
             * but ensure data is inititialized before the Sink to avoid compiler errors */
            data = 0;
            break;
        }

        switch (7)
        {
        case 7:
            /* POTENTIAL FLAW: if data == Short.MIN_VALUE, this will overflow */
            short result = (short)(--data);
            IO.writeLine("result: " + result);
            break;
        default:
            /* INCIDENTAL: CWE 561 Dead Code, the code below will never run */
            IO.writeLine("Benign, fixed string");
            break;
        }
    }

    /* goodB2G1() - use badsource and goodsink by changing the second switch to switch(8) */
    private void goodB2G1() throws Throwable
    {
        short data;

        switch (6)
        {
        case 6:
            /* POTENTIAL FLAW: Use the maximum size of the data type */
            data = Short.MIN_VALUE;
            break;
        default:
            /* INCIDENTAL: CWE 561 Dead Code, the code below will never run
             * but ensure data is inititialized before the Sink to avoid compiler errors */
            data = 0;
            break;
        }

        switch (8)
        {
        case 7:
            /* INCIDENTAL: CWE 561 Dead Code, the code below will never run */
            IO.writeLine("Benign, fixed string");
            break;
        default:
            /* FIX: Add a check to prevent an underflow from occurring */
            if (data > Short.MIN_VALUE)
            {
                short result = (short)(--data);
                IO.writeLine("result: " + result);
            }
            else
            {
                IO.writeLine("data value is too small to decrement.");
            }
            break;
        }
    }

    /* goodB2G2() - use badsource and goodsink by reversing the blocks in the second switch  */
    private void goodB2G2() throws Throwable
    {
        short data;

        switch (6)
        {
        case 6:
            /* POTENTIAL FLAW: Use the maximum size of the data type */
            data = Short.MIN_VALUE;
            break;
        default:
            /* INCIDENTAL: CWE 561 Dead Code, the code below will never run
             * but ensure data is inititialized before the Sink to avoid compiler errors */
            data = 0;
            break;
        }

        switch (7)
        {
        case 7:
            /* FIX: Add a check to prevent an underflow from occurring */
            if (data > Short.MIN_VALUE)
            {
                short result = (short)(--data);
                IO.writeLine("result: " + result);
            }
            else
            {
                IO.writeLine("data value is too small to decrement.");
            }
            break;
        default:
            /* INCIDENTAL: CWE 561 Dead Code, the code below will never run */
            IO.writeLine("Benign, fixed string");
            break;
        }
    }

    public void good() throws Throwable
    {
        goodG2B1();
        goodG2B2();
        goodB2G1();
        goodB2G2();
    }

    /* 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);
    }
}