openpgp: Move definition of struct PacketPile.

  - Implement Default for PacketPile, add internal accessor for the
    top-level.

3 files changed, 27 insertions, 23 deletions

diff --git a/openpgp/src/lib.rs b/openpgp/src/lib.rs
index 880819aa..0cd474da 100644
--- a/openpgp/src/lib.rs
+++ b/openpgp/src/lib.rs
@@ -152,6 +152,7 @@ pub use cert::Cert;
 pub mod serialize;
 
 mod packet_pile;
+pub use packet_pile::PacketPile;
 pub mod message;
 
 pub mod types;
@@ -431,25 +432,6 @@ impl Packet {
     }
 }
 
-/// A `PacketPile` holds a deserialized sequence of OpenPGP messages.
-///
-/// To deserialize an OpenPGP usage, use either [`PacketParser`],
-/// [`PacketPileParser`], or [`PacketPile::from_file`] (or related
-/// routines).
-///
-/// Normally, you'll want to convert the `PacketPile` to a Cert or a
-/// `Message`.
-///
-///   [`PacketParser`]: parse/struct.PacketParser.html
-///   [`PacketPileParser`]: parse/struct.PacketPileParser.html
-///   [`PacketPile::from_file`]: struct.PacketPile.html#method.from_file
-#[derive(PartialEq, Clone)]
-pub struct PacketPile {
-    /// At the top level, we have a sequence of packets, which may be
-    /// containers.
-    top_level: Container,
-}
-
 /// An OpenPGP message.
 ///
 /// An OpenPGP message is a structured sequence of OpenPGP packets.
diff --git a/openpgp/src/packet_pile.rs b/openpgp/src/packet_pile.rs
index 3e0a4cc1..c339095e 100644
--- a/openpgp/src/packet_pile.rs
+++ b/openpgp/src/packet_pile.rs
@@ -10,13 +10,30 @@ use crate::Result;
 use crate::Error;
 use crate::Packet;
 use crate::packet::{self, Container};
-use crate::PacketPile;
 use crate::parse::PacketParserResult;
 use crate::parse::PacketParserBuilder;
 use crate::parse::Parse;
 use crate::parse::Cookie;
 
-
+/// A `PacketPile` holds a deserialized sequence of OpenPGP messages.
+///
+/// To deserialize an OpenPGP usage, use either [`PacketParser`],
+/// [`PacketPileParser`], or [`PacketPile::from_file`] (or related
+/// routines).
+///
+/// Normally, you'll want to convert the `PacketPile` to a Cert or a
+/// `Message`.
+///
+///   [`PacketParser`]: parse/struct.PacketParser.html
+///   [`PacketPileParser`]: parse/struct.PacketPileParser.html
+///   [`PacketPile::from_file`]: struct.PacketPile.html#method.from_file
+#[derive(PartialEq, Clone, Default)]
+pub struct PacketPile {
+    /// At the top level, we have a sequence of packets, which may be
+    /// containers.
+    top_level: Container,
+}
+
 impl fmt::Debug for PacketPile {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         f.debug_struct("PacketPile")
@@ -85,6 +102,11 @@ impl From<Packet> for PacketPile {
 }
 
 impl PacketPile {
+    /// Accessor for PacketPileParser.
+    pub(crate) fn top_level_mut(&mut self) -> &mut Container {
+        &mut self.top_level
+    }
+
     /// Returns an error if operating on a non-container packet.
     fn error() -> crate::Error {
         crate::Error::InvalidOperation("Not a container packet".into())
diff --git a/openpgp/src/parse/packet_pile_parser.rs b/openpgp/src/parse/packet_pile_parser.rs
index 2390a26c..c429e716 100644
--- a/openpgp/src/parse/packet_pile_parser.rs
+++ b/openpgp/src/parse/packet_pile_parser.rs
@@ -108,7 +108,7 @@ impl<'a> PacketPileParser<'a> {
         -> Result<PacketPileParser<'a>>
     {
         Ok(PacketPileParser {
-            pile: PacketPile { top_level: Default::default() },
+            pile: Default::default(),
             ppr: ppr,
             returned_first: false,
         })
@@ -124,7 +124,7 @@ impl<'a> PacketPileParser<'a> {
     /// Inserts the next packet into the `PacketPile`.
     fn insert_packet(&mut self, packet: Packet, position: isize) {
         // Find the right container.
-        let mut container = &mut self.pile.top_level;
+        let mut container = self.pile.top_level_mut();
 
         assert!(position >= 0);