/* TEMPLATE GENERATED TESTCASE FILE
Filename: CWE191_Integer_Underflow__int_getCookies_Servlet_sub_17.java
Label Definition File: CWE191_Integer_Underflow__int.label.xml
Template File: sources-sinks-17.tmpl.java
*/
/*
* @description
* CWE: 191 Integer Underflow
* BadSource: getCookies_Servlet Read data from the first cookie using getCookies()
* GoodSource: A hardcoded non-zero, non-min, non-max, even number
* Sinks: sub
*    GoodSink: Ensure there will not be an underflow before subtracting 1 from data
*    BadSink : Subtract 1 from data, which can cause an Underflow
* Flow Variant: 17 Control flow: for loops
*
* */




import javax.servlet.http.*;


import java.util.logging.Level;

public class CWE191_Integer_Underflow__int_getCookies_Servlet_sub_17 extends AbstractTestCaseServlet
{
    public void bad(HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        int data;

        /* We need to have one source outside of a for loop in order
         * to prevent the Java compiler from generating an error because
         * data is uninitialized
         */

        data = Integer.MIN_VALUE; /* initialize data in case there are no cookies */

        /* Read data from cookies */
        {
            Cookie cookieSources[] = request.getCookies();
            if (cookieSources != null)
            {
                /* POTENTIAL FLAW: Read data from the first cookie value */
                String stringNumber = cookieSources[0].getValue();
                try
                {
                    data = Integer.parseInt(stringNumber.trim());
                }
                catch(NumberFormatException exceptNumberFormat)
                {
                    IO.logger.log(Level.WARNING, "Number format exception reading data from cookie", exceptNumberFormat);
                }
            }
        }

        for (int j = 0; j < 1; j++)
        {
            /* POTENTIAL FLAW: if data == Integer.MIN_VALUE, this will overflow */
            int result = (int)(data - 1);
            IO.writeLine("result: " + result);
        }
    }

    /* goodG2B() - use goodsource and badsink */
    private void goodG2B(HttpServletRequest request, HttpServletResponse response) 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;

        for (int j = 0; j < 1; j++)
        {
            /* POTENTIAL FLAW: if data == Integer.MIN_VALUE, this will overflow */
            int result = (int)(data - 1);
            IO.writeLine("result: " + result);
        }
    }

    /* goodB2G() - use badsource and goodsink*/
    private void goodB2G(HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        int data;

        data = Integer.MIN_VALUE; /* initialize data in case there are no cookies */

        /* Read data from cookies */
        {
            Cookie cookieSources[] = request.getCookies();
            if (cookieSources != null)
            {
                /* POTENTIAL FLAW: Read data from the first cookie value */
                String stringNumber = cookieSources[0].getValue();
                try
                {
                    data = Integer.parseInt(stringNumber.trim());
                }
                catch(NumberFormatException exceptNumberFormat)
                {
                    IO.logger.log(Level.WARNING, "Number format exception reading data from cookie", exceptNumberFormat);
                }
            }
        }

        for (int k = 0; k < 1; k++)
        {
            /* FIX: Add a check to prevent an overflow from occurring */
            if (data > Integer.MIN_VALUE)
            {
                int result = (int)(data - 1);
                IO.writeLine("result: " + result);
            }
            else
            {
                IO.writeLine("data value is too small to perform subtraction.");
            }
        }
    }

    public void good(HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        goodG2B(request, response);
        goodB2G(request, response);
    }

    /* 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);
    }
}
