openpgp: Implement Ord for Unknown

  - Sort by tag, then the body (lexographically).

1 files changed, 23 insertions, 2 deletions

diff --git a/openpgp/src/packet/unknown.rs b/openpgp/src/packet/unknown.rs
index 44e1b334..07cd5e0e 100644
--- a/openpgp/src/packet/unknown.rs
+++ b/openpgp/src/packet/unknown.rs
@@ -1,5 +1,7 @@
-use failure;
 use std::hash::{Hash, Hasher};
+use std::cmp::Ordering;
+
+use failure;
 
 use crate::packet::Tag;
 use crate::packet;
@@ -25,9 +27,28 @@ impl Eq for Unknown {}
 
 impl PartialEq for Unknown {
     fn eq(&self, other: &Unknown) -> bool {
+        self.cmp(other) == Ordering::Equal
+    }
+}
+
+impl PartialOrd for Unknown
+{
+    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+        Some(self.cmp(other))
+    }
+}
+
+impl Ord for Unknown
+{
+    fn cmp(&self, other: &Unknown) -> Ordering {
+        // An unknown packet cannot have children.
         assert!(self.common.children.is_none());
         assert!(other.common.children.is_none());
-        self.common.body == other.common.body && self.tag == other.tag
+
+        match self.tag.cmp(&other.tag) {
+            Ordering::Equal => self.common.body().cmp(&other.common.body()),
+            o => o,
+        }
     }
 }