question: public static void encode ( InputStream in , Writer out ) throws IOException { int column = 0 ; while ( true ) { int byte1 = in . read ( ) ; int byte2 = in . read ( ) ; int byte3 = in . read ( ) ; if ( byte1 < 0 ) { return ; } if ( column >= 72 ) { column = 0 ; out . write ( '\n' ) ; } out . write ( charset [ byte1 > > 2 ] ) ; int index = ( byte1 & 0x3 ) << 4 ; if ( byte2 < 0 ) { out . write ( charset [ index ] ) ; out . write ( paddingChar ) ; out . write ( paddingChar ) ; return ; } index += byte2 > > 4 ; out . write ( charset [ index ] ) ; index = ( byte2 & 0xf ) << 2 ; if ( byte3 < 0 ) { out . write ( charset [ index ] ) ; out . write ( paddingChar ) ; return ; } index += byte3 > > 6 ; out . write ( charset [ index ] ) ; out . write ( charset [ byte3 & 0x3f ] ) ; column += 4 ; } }
target:  Description of the Method