/* TEMPLATE GENERATED TESTCASE FILE
Filename: CWE191_Integer_Underflow__int_listen_tcp_multiply_74b.java
Label Definition File: CWE191_Integer_Underflow__int.label.xml
Template File: sources-sinks-74b.tmpl.java
*/
/*
 * @description
 * CWE: 191 Integer Underflow
 * BadSource: listen_tcp Read data using a listening tcp connection
 * GoodSource: A hardcoded non-zero, non-min, non-max, even number
 * Sinks: multiply
 *    GoodSink: Ensure there will not be an underflow before multiplying data by 2
 *    BadSink : If data is negative, multiply by 2, which can cause an underflow
 * Flow Variant: 74 Data flow: data passed in a HashMap from one method to another in different source files in the same package
 *
 * */



import java.util.HashMap;



public class CWE191_Integer_Underflow__int_listen_tcp_multiply_74b
{
    public void badSink(HashMap<Integer,Integer> dataHashMap ) throws Throwable
    {
        int data = dataHashMap.get(2);

        if(data < 0) /* ensure we won't have an overflow */
        {
            /* POTENTIAL FLAW: if (data * 2) < Integer.MIN_VALUE, this will underflow */
            int result = (int)(data * 2);
            IO.writeLine("result: " + result);
        }

    }

    /* goodG2B() - use GoodSource and BadSink */
    public void goodG2BSink(HashMap<Integer,Integer> dataHashMap ) throws Throwable
    {
        int data = dataHashMap.get(2);

        if(data < 0) /* ensure we won't have an overflow */
        {
            /* POTENTIAL FLAW: if (data * 2) < Integer.MIN_VALUE, this will underflow */
            int result = (int)(data * 2);
            IO.writeLine("result: " + result);
        }

    }

    /* goodB2G() - use BadSource and GoodSink */
    public void goodB2GSink(HashMap<Integer,Integer> dataHashMap ) throws Throwable
    {
        int data = dataHashMap.get(2);

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

    }
}
