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;
     }
 
 }