question: indicates if the character is valid and can be decoded . concode_field_sep char[] BASE64_DIGITS concode_elem_sep byte[] DECODER_RING concode_field_sep String encode concode_elem_sep String encode concode_elem_sep String encode concode_elem_sep String encode concode_elem_sep int byteAt concode_elem_sep byte[] decode concode_elem_sep byte[] decode concode_elem_sep int unsign
target: boolean function ( char arg0 ) { return ( arg0 < 128 ) && ( DECODER_RING [ arg0 ] != - 1 ) ; }