openpgp: Add Parse::from_buffered_reader.

  - Add a buffered-reader-based function to trait Parse.  This allows
    us to manipulate the buffered reader stack before and after
    parsing, e.g. to parse several armored objects in one stream.  The
    CertParser also does this, but uses internal interfaces for that.

1 files changed, 11 insertions, 0 deletions

diff --git a/openpgp/src/packet_pile.rs b/openpgp/src/packet_pile.rs
index f62eb6f6..1678c523 100644
--- a/openpgp/src/packet_pile.rs
+++ b/openpgp/src/packet_pile.rs
@@ -120,6 +120,17 @@ impl fmt::Debug for PacketPile {
 }
 
 impl<'a> Parse<'a, PacketPile> for PacketPile {
+    /// Deserializes the OpenPGP message stored in the file named by
+    /// `path`.
+    ///
+    /// See `from_reader` for more details and caveats.
+    fn from_buffered_reader<R>(reader: R) -> Result<PacketPile>
+    where
+        R: BufferedReader<Cookie> + 'a,
+    {
+        PacketPile::from_cookie_reader(reader.into_boxed())
+    }
+
     /// Deserializes the OpenPGP message stored in a `std::io::Read`
     /// object.
     ///