Base64Converter.java

package hudson.drools.eclipse;
public class  Base64Converter
      //////////////////////////////////////////////////////////////////////
      //////////////////////////////////////////////////////////////////////
      {
 
     public static final char [ ]  alphabet = {
        'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',   //  0 to  7
        'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',   //  8 to 15
        'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',   // 16 to 23
        'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',   // 24 to 31
        'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',   // 32 to 39
        'o', 'p', 'q', 'r', 's', 't', 'u', 'v',   // 40 to 47
        'w', 'x', 'y', 'z', '0', '1', '2', '3',   // 48 to 55
        '4', '5', '6', '7', '8', '9', '+', '/' }; // 56 to 63
 
     //////////////////////////////////////////////////////////////////////
      //////////////////////////////////////////////////////////////////////
 
     public static String  encode ( String  s )
      //////////////////////////////////////////////////////////////////////
      {
        return encode ( s.getBytes ( ) );
      }
 
     public static String  encode ( byte [ ]  octetString )
      //////////////////////////////////////////////////////////////////////
      {
        int  bits24;
        int  bits6;
 
       char [ ]  out
          = new char [ ( ( octetString.length - 1 ) / 3 + 1 ) * 4 ];
 
       int outIndex = 0;
        int i        = 0;
 
       while ( ( i + 3 ) <= octetString.length )
        {
          // store the octets
          bits24  = ( octetString [ i++ ] & 0xFF ) << 16; 
          bits24 |= ( octetString [ i++ ] & 0xFF ) <<  8; 
          bits24 |= ( octetString [ i++ ] & 0xFF ) <<  0;
 
         bits6 = ( bits24 & 0x00FC0000 ) >> 18; 
          out [ outIndex++ ] = alphabet [ bits6 ];
          bits6 = ( bits24 & 0x0003F000 ) >> 12; 
          out [ outIndex++ ] = alphabet [ bits6 ];
          bits6 = ( bits24 & 0x00000FC0 ) >> 6; 
          out [ outIndex++ ] = alphabet [ bits6 ];
          bits6 = ( bits24 & 0x0000003F );
          out [ outIndex++ ] = alphabet [ bits6 ]; 
        }
 
       if ( octetString.length - i == 2 )
        {
          // store the octets 
          bits24  = ( octetString [ i     ] & 0xFF ) << 16; 
          bits24 |= ( octetString [ i + 1 ] & 0xFF ) <<  8;
 
         bits6 = ( bits24 & 0x00FC0000 ) >> 18;
          out [ outIndex++ ] = alphabet [ bits6 ]; 
          bits6 = ( bits24 & 0x0003F000 ) >> 12; 
          out [ outIndex++ ] = alphabet [ bits6 ]; 
          bits6 = ( bits24 & 0x00000FC0 ) >> 6; 
          out [ outIndex++ ] = alphabet [ bits6 ];
 
         // padding
          out [ outIndex++ ] = '='; 
        }
        else if ( octetString.length - i == 1 )
        {
          // store the octets 
          bits24 = ( octetString [ i ] & 0xFF ) << 16;
 
         bits6 = ( bits24 & 0x00FC0000 ) >> 18;
          out [ outIndex++ ] = alphabet [ bits6 ];
          bits6 = ( bits24 & 0x0003F000 ) >> 12; 
          out [ outIndex++ ] = alphabet [ bits6 ];
 
         // padding
          out [ outIndex++ ] = '='; 
          out [ outIndex++ ] = '='; 
        }
 
       return new String ( out );
      }
 
     //////////////////////////////////////////////////////////////////////
      //////////////////////////////////////////////////////////////////////
      }