<s>[INST] parses the uuid from a pssh atom . the uuid is only parsed if the data is a valid pssh atom . concode_field_sep PlaceHolder placeHolder concode_field_sep byte[] parseSchemeSpecificData concode_elem_sep byte[] buildPsshAtom concode_elem_sep boolean isPsshAtom [/INST] UUID function ( byte [ ] arg0 ) { ParsableByteArray loc0 = new ParsableByteArray ( arg0 ) ; if ( ! isPsshAtom ( loc0 , null ) ) { return null ; } loc0 . setPosition ( Atom . FULL_HEADER_SIZE ) ; return new UUID ( loc0 . readLong ( ) , loc0 . readLong ( ) ) ; </s>