/* TEMPLATE GENERATED TESTCASE FILE
Filename: CWE191_Integer_Underflow__short_rand_predec_75b.java
Label Definition File: CWE191_Integer_Underflow.label.xml
Template File: sources-sinks-75b.tmpl.java
*/
/*
 * @description
 * CWE: 191 Integer Underflow
 * BadSource: rand Set data to result of rand()
 * 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: 75 Data flow: data passed in a serialized object from one method to another in different source files in the same package
 *
 * */

package testcases.CWE191_Integer_Underflow.s05;
import testcasesupport.*;
import java.io.ByteArrayInputStream;
import java.io.ObjectInputStream;
import java.io.IOException;
import java.util.logging.Level;

public class CWE191_Integer_Underflow__short_rand_predec_75b
{
    public void badSink(byte[] dataSerialized ) throws Throwable
    {
        /* unserialize data */
        ByteArrayInputStream streamByteArrayInput = null;
        ObjectInputStream streamObjectInput = null;

        try
        {
            streamByteArrayInput = new ByteArrayInputStream(dataSerialized);
            streamObjectInput = new ObjectInputStream(streamByteArrayInput);
            short data = (Short)streamObjectInput.readObject();

            /* POTENTIAL FLAW: if data == Short.MIN_VALUE, this will overflow */
            short result = (short)(--data);

            IO.writeLine("result: " + result);

        }
        catch (IOException exceptIO)
        {
            IO.logger.log(Level.WARNING, "IOException in deserialization", exceptIO);
        }
        catch (ClassNotFoundException exceptClassNotFound)
        {
            IO.logger.log(Level.WARNING, "ClassNotFoundException in deserialization", exceptClassNotFound);
        }
        finally
        {
            /* clean up stream reading objects */
            try
            {
                if (streamObjectInput != null)
                {
                    streamObjectInput.close();
                }
            }
            catch (IOException exceptIO)
            {
                IO.logger.log(Level.WARNING, "Error closing ObjectInputStream", exceptIO);
            }

            try
            {
                if (streamByteArrayInput != null)
                {
                    streamByteArrayInput.close();
                }
            }
            catch (IOException exceptIO)
            {
                IO.logger.log(Level.WARNING, "Error closing ByteArrayInputStream", exceptIO);
            }
        }
    }

    /* goodG2B() - use GoodSource and BadSink */
    public void goodG2BSink(byte[] dataSerialized ) throws Throwable
    {
        /* unserialize data */
        ByteArrayInputStream streamByteArrayInput = null;
        ObjectInputStream streamObjectInput = null;

        try {
            streamByteArrayInput = new ByteArrayInputStream(dataSerialized);
            streamObjectInput = new ObjectInputStream(streamByteArrayInput);
            short data = (Short)streamObjectInput.readObject();

            /* POTENTIAL FLAW: if data == Short.MIN_VALUE, this will overflow */
            short result = (short)(--data);

            IO.writeLine("result: " + result);

        }
        catch (IOException exceptIO)
        {
            IO.logger.log(Level.WARNING, "IOException in deserialization", exceptIO);
        }
        catch (ClassNotFoundException exceptClassNotFound)
        {
            IO.logger.log(Level.WARNING, "ClassNotFoundException in deserialization", exceptClassNotFound);
        }
        finally
        {
            /* clean up stream reading objects */
            try
            {
                if (streamObjectInput != null)
                {
                    streamObjectInput.close();
                }
            }
            catch (IOException exceptIO)
            {
                IO.logger.log(Level.WARNING, "Error closing ObjectInputStream", exceptIO);
            }

            try
            {
                if (streamByteArrayInput != null)
                {
                    streamByteArrayInput.close();
                }
            }
            catch (IOException exceptIO)
            {
                IO.logger.log(Level.WARNING, "Error closing ByteArrayInputStream", exceptIO);
            }
        }
    }

    /* goodB2G() - use BadSource and GoodSink */
    public void goodB2GSink(byte[] dataSerialized ) throws Throwable
    {
        /* unserialize data */
        ByteArrayInputStream streamByteArrayInput = null;
        ObjectInputStream streamObjectInput = null;

        try
        {
            streamByteArrayInput = new ByteArrayInputStream(dataSerialized);
            streamObjectInput = new ObjectInputStream(streamByteArrayInput);
            short data = (Short)streamObjectInput.readObject();

            /* 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.");
            }

        }
        catch (IOException exceptIO)
        {
            IO.logger.log(Level.WARNING, "IOException in deserialization", exceptIO);
        }
        catch (ClassNotFoundException exceptClassNotFound)
        {
            IO.logger.log(Level.WARNING, "ClassNotFoundException in deserialization", exceptClassNotFound);
        }
        finally
        {
            /* clean up stream reading objects */
            try
            {
                if (streamObjectInput != null)
                {
                    streamObjectInput.close();
                }
            }
            catch (IOException exceptIO)
            {
                IO.logger.log(Level.WARNING, "Error closing ObjectInputStream", exceptIO);
            }

            try
            {
                if (streamByteArrayInput != null)
                {
                    streamByteArrayInput.close();
                }
            }
            catch (IOException exceptIO)
            {
                IO.logger.log(Level.WARNING, "Error closing ByteArrayInputStream", exceptIO);
            }
        }
    }
}