question: private String base64 ( String value ) { StringBuffer cb = new StringBuffer ( ) ; int i = 0 ; for ( i = 0 ; i + 2 < value . length ( ) ; i += 3 ) { long chunk = ( int ) value . charAt ( i ) ; chunk = ( chunk << 8 ) + ( int ) value . charAt ( i + 1 ) ; chunk = ( chunk << 8 ) + ( int ) value . charAt ( i + 2 ) ; cb . append ( encode ( chunk > > 18 ) ) ; cb . append ( encode ( chunk > > 12 ) ) ; cb . append ( encode ( chunk > > 6 ) ) ; cb . append ( encode ( chunk ) ) ; } if ( i + 1 < value . length ( ) ) { long chunk = ( int ) value . charAt ( i ) ; chunk = ( chunk << 8 ) + ( int ) value . charAt ( i + 1 ) ; chunk <<= 8 ; cb . append ( encode ( chunk > > 18 ) ) ; cb . append ( encode ( chunk > > 12 ) ) ; cb . append ( encode ( chunk > > 6 ) ) ; cb . append ( '=' ) ; } else if ( i < value . length ( ) ) { long chunk = ( int ) value . charAt ( i ) ; chunk <<= 16 ; cb . append ( encode ( chunk > > 18 ) ) ; cb . append ( encode ( chunk > > 12 ) ) ; cb . append ( '=' ) ; cb . append ( '=' ) ; } return cb . toString ( ) ; }
target:  Creates the Base64 value.