Merge pull request #592 from Byron/master

            let pkey = PKey::from_ptr(pkey);

            let cert = X509::from_ptr(cert);

            let chain = Stack::from_ptr(chain);

            let chain = if chain.is_null() {

                try!(Stack::new())

            } else {

                Stack::from_ptr(chain)

            };

            Ok(ParsedPkcs12 {

                pkey: pkey,

pub struct ParsedPkcs12 {

    pub pkey: PKey,

    pub cert: X509,

    // FIXME Make this Option<Stack> in the next breaking release

    pub chain: Stack<X509>,

}

                   "c0cbdf7cdd03c9773e5468e1f6d2da7d5cbb1875");

    }

    #[test]

    fn parse_empty_chain() {

        let der = include_bytes!("../test/keystore-empty-chain.p12");

        let pkcs12 = Pkcs12::from_der(der).unwrap();

        let parsed = pkcs12.parse("cassandra").unwrap();

        assert_eq!(parsed.chain.len(), 0);

        assert_eq!(parsed.chain.into_iter().collect::<Vec<_>>().len(), 0);

    }

    #[test]

    fn create() {

        let subject_name = "ns.example.com";

    #[inline]

    unsafe fn from_ptr(ptr: *mut T::StackType) -> Stack<T> {

        assert!(!ptr.is_null(), "Must not instantiate a Stack from a null-ptr - use Stack::new() in \

                                 that case");

        Stack(ptr)

    }