/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2002 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Apache" and "Apache Software Foundation" and
 *    "Apache POI" must not be used to endorse or promote products
 *    derived from this software without prior written permission. For
 *    written permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache",
 *    "Apache POI", nor may "Apache" appear in their name, without
 *    prior written permission of the Apache Software Foundation.
 *
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

package org.apache.poi.util;

import junit.framework.*;

import java.io.*;

/**
 * @author Marc Johnson (mjohnson at apache dot org)
 */

public class TestHexDump
    extends TestCase
{

    /**
     * Creates new TestHexDump
     *
     * @param name
     */

    public TestHexDump(String name)
    {
        super(name);
    }

    private char toHex(final int n)
    {
        char[] hexChars =
        {
            '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C',
            'D', 'E', 'F'
        };

        return hexChars[ n % 16 ];
    }

    /**
     * test dump method
     *
     * @exception IOException
     */

    public void testDump()
        throws IOException
    {
        byte[] testArray = new byte[ 256 ];

        for (int j = 0; j < 256; j++)
        {
            testArray[ j ] = ( byte ) j;
        }
        ByteArrayOutputStream stream = new ByteArrayOutputStream();

        HexDump.dump(testArray, 0, stream, 0);
        byte[] outputArray = new byte[ 16 * (73 + HexDump.EOL.length()) ];

        for (int j = 0; j < 16; j++)
        {
            int offset = (73 + HexDump.EOL.length()) * j;

            outputArray[ offset++ ] = ( byte ) '0';
            outputArray[ offset++ ] = ( byte ) '0';
            outputArray[ offset++ ] = ( byte ) '0';
            outputArray[ offset++ ] = ( byte ) '0';
            outputArray[ offset++ ] = ( byte ) '0';
            outputArray[ offset++ ] = ( byte ) '0';
            outputArray[ offset++ ] = ( byte ) toHex(j);
            outputArray[ offset++ ] = ( byte ) '0';
            outputArray[ offset++ ] = ( byte ) ' ';
            for (int k = 0; k < 16; k++)
            {
                outputArray[ offset++ ] = ( byte ) toHex(j);
                outputArray[ offset++ ] = ( byte ) toHex(k);
                outputArray[ offset++ ] = ( byte ) ' ';
            }
            for (int k = 0; k < 16; k++)
            {
                outputArray[ offset++ ] = ( byte ) toAscii((j * 16) + k);
            }
            System.arraycopy(HexDump.EOL.getBytes(), 0, outputArray, offset,
                             HexDump.EOL.getBytes().length);
        }
        byte[] actualOutput = stream.toByteArray();

        assertEquals("array size mismatch", outputArray.length,
                     actualOutput.length);
        for (int j = 0; j < outputArray.length; j++)
        {
            assertEquals("array[ " + j + "] mismatch", outputArray[ j ],
                         actualOutput[ j ]);
        }

        // verify proper behavior with non-zero offset
        stream = new ByteArrayOutputStream();
        HexDump.dump(testArray, 0x10000000, stream, 0);
        outputArray = new byte[ 16 * (73 + HexDump.EOL.length()) ];
        for (int j = 0; j < 16; j++)
        {
            int offset = (73 + HexDump.EOL.length()) * j;

            outputArray[ offset++ ] = ( byte ) '1';
            outputArray[ offset++ ] = ( byte ) '0';
            outputArray[ offset++ ] = ( byte ) '0';
            outputArray[ offset++ ] = ( byte ) '0';
            outputArray[ offset++ ] = ( byte ) '0';
            outputArray[ offset++ ] = ( byte ) '0';
            outputArray[ offset++ ] = ( byte ) toHex(j);
            outputArray[ offset++ ] = ( byte ) '0';
            outputArray[ offset++ ] = ( byte ) ' ';
            for (int k = 0; k < 16; k++)
            {
                outputArray[ offset++ ] = ( byte ) toHex(j);
                outputArray[ offset++ ] = ( byte ) toHex(k);
                outputArray[ offset++ ] = ( byte ) ' ';
            }
            for (int k = 0; k < 16; k++)
            {
                outputArray[ offset++ ] = ( byte ) toAscii((j * 16) + k);
            }
            System.arraycopy(HexDump.EOL.getBytes(), 0, outputArray, offset,
                             HexDump.EOL.getBytes().length);
        }
        actualOutput = stream.toByteArray();
        assertEquals("array size mismatch", outputArray.length,
                     actualOutput.length);
        for (int j = 0; j < outputArray.length; j++)
        {
            assertEquals("array[ " + j + "] mismatch", outputArray[ j ],
                         actualOutput[ j ]);
        }

        // verify proper behavior with negative offset
        stream = new ByteArrayOutputStream();
        HexDump.dump(testArray, 0xFF000000, stream, 0);
        outputArray = new byte[ 16 * (73 + HexDump.EOL.length()) ];
        for (int j = 0; j < 16; j++)
        {
            int offset = (73 + HexDump.EOL.length()) * j;

            outputArray[ offset++ ] = ( byte ) 'F';
            outputArray[ offset++ ] = ( byte ) 'F';
            outputArray[ offset++ ] = ( byte ) '0';
            outputArray[ offset++ ] = ( byte ) '0';
            outputArray[ offset++ ] = ( byte ) '0';
            outputArray[ offset++ ] = ( byte ) '0';
            outputArray[ offset++ ] = ( byte ) toHex(j);
            outputArray[ offset++ ] = ( byte ) '0';
            outputArray[ offset++ ] = ( byte ) ' ';
            for (int k = 0; k < 16; k++)
            {
                outputArray[ offset++ ] = ( byte ) toHex(j);
                outputArray[ offset++ ] = ( byte ) toHex(k);
                outputArray[ offset++ ] = ( byte ) ' ';
            }
            for (int k = 0; k < 16; k++)
            {
                outputArray[ offset++ ] = ( byte ) toAscii((j * 16) + k);
            }
            System.arraycopy(HexDump.EOL.getBytes(), 0, outputArray, offset,
                             HexDump.EOL.getBytes().length);
        }
        actualOutput = stream.toByteArray();
        assertEquals("array size mismatch", outputArray.length,
                     actualOutput.length);
        for (int j = 0; j < outputArray.length; j++)
        {
            assertEquals("array[ " + j + "] mismatch", outputArray[ j ],
                         actualOutput[ j ]);
        }

        // verify proper behavior with non-zero index
        stream = new ByteArrayOutputStream();
        HexDump.dump(testArray, 0x10000000, stream, 0x81);
        outputArray = new byte[ (8 * (73 + HexDump.EOL.length())) - 1 ];
        for (int j = 0; j < 8; j++)
        {
            int offset = (73 + HexDump.EOL.length()) * j;

            outputArray[ offset++ ] = ( byte ) '1';
            outputArray[ offset++ ] = ( byte ) '0';
            outputArray[ offset++ ] = ( byte ) '0';
            outputArray[ offset++ ] = ( byte ) '0';
            outputArray[ offset++ ] = ( byte ) '0';
            outputArray[ offset++ ] = ( byte ) '0';
            outputArray[ offset++ ] = ( byte ) toHex(j + 8);
            outputArray[ offset++ ] = ( byte ) '1';
            outputArray[ offset++ ] = ( byte ) ' ';
            for (int k = 0; k < 16; k++)
            {
                int index = 0x81 + (j * 16) + k;

                if (index < 0x100)
                {
                    outputArray[ offset++ ] = ( byte ) toHex(index / 16);
                    outputArray[ offset++ ] = ( byte ) toHex(index);
                }
                else
                {
                    outputArray[ offset++ ] = ( byte ) ' ';
                    outputArray[ offset++ ] = ( byte ) ' ';
                }
                outputArray[ offset++ ] = ( byte ) ' ';
            }
            for (int k = 0; k < 16; k++)
            {
                int index = 0x81 + (j * 16) + k;

                if (index < 0x100)
                {
                    outputArray[ offset++ ] = ( byte ) toAscii(index);
                }
            }
            System.arraycopy(HexDump.EOL.getBytes(), 0, outputArray, offset,
                             HexDump.EOL.getBytes().length);
        }
        actualOutput = stream.toByteArray();
        assertEquals("array size mismatch", outputArray.length,
                     actualOutput.length);
        for (int j = 0; j < outputArray.length; j++)
        {
            assertEquals("array[ " + j + "] mismatch", outputArray[ j ],
                         actualOutput[ j ]);
        }

        // verify proper behavior with negative index
        try
        {
            HexDump.dump(testArray, 0x10000000, new ByteArrayOutputStream(),
                         -1);
            fail("should have caught ArrayIndexOutOfBoundsException on negative index");
        }
        catch (ArrayIndexOutOfBoundsException ignored_exception)
        {

            // as expected
        }

        // verify proper behavior with index that is too large
        try
        {
            HexDump.dump(testArray, 0x10000000, new ByteArrayOutputStream(),
                         testArray.length);
            fail("should have caught ArrayIndexOutOfBoundsException on large index");
        }
        catch (ArrayIndexOutOfBoundsException ignored_exception)
        {

            // as expected
        }

        // verify proper behavior with null stream
        try
        {
            HexDump.dump(testArray, 0x10000000, null, 0);
            fail("should have caught IllegalArgumentException on negative index");
        }
        catch (IllegalArgumentException ignored_exception)
        {

            // as expected
        }
    }

    public void testToHex()
            throws Exception
    {
        assertEquals( "000A", HexDump.toHex((short)0xA));
        assertEquals( "0A", HexDump.toHex((byte)0xA));
        assertEquals( "0000000A", HexDump.toHex((int)0xA));

        assertEquals( "FFFF", HexDump.toHex((short)0xFFFF));

    }

    private char toAscii(final int c)
    {
        char rval = '.';

        if ((c >= 32) && (c <= 126))
        {
            rval = ( char ) c;
        }
        return rval;
    }

    /**
     * main method to run the unit tests
     *
     * @param ignored_args
     */

    public static void main(String [] ignored_args)
    {
        System.out.println("Testing util.HexDump functionality");
        junit.textui.TestRunner.run(TestHexDump.class);
    }
}