/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you under the Apache License, Version 2.0 (the
 *  "License"); you may not use this file except in compliance
 *  with the License.  You may obtain a copy of the License at
 *  
 *    http://www.apache.org/licenses/LICENSE-2.0
 *  
 *  Unless required by applicable law or agreed to in writing,
 *  software distributed under the License is distributed on an
 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 *  KIND, either express or implied.  See the License for the
 *  specific language governing permissions and limitations
 *  under the License. 
 *  
 */
package org.apache.directory.server.kerberos.kdc;


import java.io.BufferedInputStream;
import java.io.CharArrayWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;                            


/**
 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
 * @version $Rev$, $Date$
 */
public class KerberosTestUtils
{
    public static char[] getControlDocument( String resource ) throws IOException
    {
        InputStream is = ClassLoader.getSystemClassLoader().getResourceAsStream( resource );

        Reader reader = new InputStreamReader( new BufferedInputStream( is ) );

        CharArrayWriter writer = new CharArrayWriter();

        try
        {
            char[] buf = new char[2048];
            int len = 0;
            while ( len >= 0 )
            {
                len = reader.read( buf );
                if ( len > 0 )
                {
                    writer.write( buf, 0, len );
                }
            }
        }
        finally
        {
            try
            {
                reader.close();
            }
            catch ( IOException ioe )
            {
            }
        }

        char[] isca = writer.toCharArray();
        return isca;
    }


    public static byte[] getBytesFromResource( String resource ) throws IOException
    {
        InputStream is = ClassLoader.getSystemClassLoader().getResourceAsStream( resource );

        BufferedInputStream stream = new BufferedInputStream( is );
        int len = stream.available();
        byte[] bytes = new byte[len];
        stream.read( bytes, 0, len );

        return bytes;
    }


    public static void hexdump( byte[] data )
    {
        hexdump( data, true );
    }


    public static void hexdump( byte[] data, boolean delimit )
    {
        String delimiter = new String( "-------------------------------------------------" );

        if ( delimit )
        {
            System.out.println( delimiter );
        }

        int lineLength = 0;
        for ( int ii = 0; ii < data.length; ii++ )
        {
            System.out.print( byte2hexString( data[ii] ) + " " );
            lineLength++;

            if ( lineLength == 8 )
            {
                System.out.print( "  " );
            }

            if ( lineLength == 16 )
            {
                System.out.println();
                lineLength = 0;
            }
        }

        if ( delimit )
        {
            System.out.println();
            System.out.println( delimiter );
        }
    }

    public static final String[] hex_digit =
        { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };


    public static String byte2hexString( byte x )
    {
        String s = "";
        for ( int ii = 0; ii < 2; ii++ )
        {
            s = hex_digit[( ( ( x ) & 0xff ) & ( 15 << ( ii * 4 ) ) ) >>> ( ii * 4 )] + s;
        }

        return s;
    }


    public static String int2hexString( int x )
    {
        String s = "";
        for ( int ii = 0; ii < 8; ii++ )
        {
            s = hex_digit[( x & ( 15 << ( ii * 4 ) ) ) >>> ( ii * 4 )] + s;
        }

        return s;
    }


    public static String int2binString( int x )
    {
        String s = "";
        for ( int ii = 0; ii < 32; ii++ )
        {
            if ( ( ii > 0 ) && ( ii % 4 == 0 ) )
            {
                s = " " + s;
            }

            s = hex_digit[( x & ( 1 << ii ) ) >>> ii] + s;
        }

        return s;
    }


    public static String long2hexString( long x )
    {
        String s = "";
        for ( int ii = 0; ii < 16; ii++ )
        {
            s = hex_digit[( int ) ( ( x & ( 15L << ( ii * 4 ) ) ) >>> ( ii * 4 ) )] + s;
        }

        return s;
    }


    public static String long2binString( long x )
    {
        String s = "";
        for ( int ii = 0; ii < 64; ii++ )
        {
            if ( ( ii > 0 ) && ( ii % 4 == 0 ) )
            {
                s = " " + s;
            }

            s = hex_digit[( int ) ( ( x & ( 1L << ii ) ) >>> ii )] + s;
        }

        return s;
    }


    public static String byte2hexString( byte[] input )
    {
        return byte2hexString( input, 0, input.length );
    }


    public static String byte2hexString( byte[] input, int offset )
    {
        return byte2hexString( input, offset, input.length );
    }


    public static String byte2hexString( byte[] input, int offset, int length )
    {
        String result = "";
        for ( int ii = 0; ii < length; ii++ )
        {
            if ( ii + offset < input.length )
            {
                result += byte2hexString( input[ii + offset] );
            }
        }

        return result;
    }
}