openpgp: Fix parsing.

  - Previously, a signature packet with a malformed embedded signature
    would break the parsing, because the embedded signature is turned
    into an unknown packet, hence `Signature::from_reader` returns
    `Error::InvalidOperation` and so does `SubpacketArea::parse`.
    Errors from that function are handled using php_try!, but that did
    not make the packet turn into an unknown packet, but terminated
    the parsing.

  - Looking at `Subpacket::parse` revealed that there are more errors
    that would terminate parsing in the outlined way, notably
    `Error::MalformedPacket`, but there may be others.

  - Fix this by tweaking php_try! to return unknown packets on any
    `openpgp::Error`.

0 files changed, 0 insertions, 0 deletions