package org.apache.maven.surefire.util.internal;

 /*

  * 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.

  */

 /**

  * @author Kristian Rosenvold

  */

 public class ByteBuffer

 {

     private final byte[] data;

     private int position;

     public ByteBuffer( int length )

     {

         this.data = new byte[length];

     }

     public ByteBuffer( byte[] buf, int off, int len )

     {

         this.data = new byte[len];

         append( buf, off, len );

     }

     public void append( char chararcter )

     {

         data[position++] = (byte) chararcter;

     }

     public void append( byte chararcter )

     {

         data[position++] = chararcter;

     }

     private static final byte comma = (byte) ',';

     public void comma()

     {

         data[position++] = comma;

     }

     public void advance( int i )

     { // Oooh nice break of encapsulation

         position += i;

     }

     public void append( Integer integer )

     {

         toHex( integer );

     }

     /**

      * Convert the integer to an unsigned number.

      *

      * @param i the value

      */

     private void toHex( int i )

     {

         byte[] buf = new byte[32];

         int charPos = 32;

         int radix = 1 << 4;

         int mask = radix - 1;

         do

         {

             buf[--charPos] = (byte) digits[i & mask];

             i >>>= 4;

         }

         while ( i != 0 );

         append( buf, charPos, ( 32 - charPos ) );

     }

     private final static char[] digits =

         { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l',

             'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z' };

     public byte[] getData()

     {

         return data;

     }

     public int getlength()

     {

         return position;

     }

     public String toString()

     {

         return new String( data, 0, position );

     }

     public static byte[] copy( byte[] src1, int off1, int len1 )

     {

         byte[] combined = new byte[len1];

         int pos = 0;

         for ( int i = off1; i < off1 + len1; i++ )

         {

             combined[pos++] = src1[i];

         }

         return combined;

     }

     void append( byte[] src1, int off1, int len1 )

     {

         for ( int i = off1; i < off1 + len1; i++ )

         {

             data[position++] = src1[i];

         }

     }

     public static byte[] join( byte[] src1, int off1, int len1, byte[] src2, int off2, int len2 )

     {

         byte[] combined = new byte[len1 + len2];

         int pos = 0;

         for ( int i = off1; i < off1 + len1; i++ )

         {

             combined[pos++] = src1[i];

         }

         for ( int i = off2; i < off2 + len2; i++ )

         {

             combined[pos++] = src2[i];

         }

         return combined;

     }

 }