From ad1aec3d89a2f9b57030cb3047674df17b9ec63c Mon Sep 17 00:00:00 2001
From: Tony Garnock-Jones <tonyg@leastfixedpoint.com>
Date: Wed, 26 Oct 2022 12:49:34 +0200
Subject: [PATCH] Reject odd number of hexits rather than ignoring the lone
 trailing hexit

---
 implementations/rust/preserves/src/hex.rs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/implementations/rust/preserves/src/hex.rs b/implementations/rust/preserves/src/hex.rs
index 7adb7cf..14fd09b 100644
--- a/implementations/rust/preserves/src/hex.rs
+++ b/implementations/rust/preserves/src/hex.rs
@@ -36,7 +36,11 @@ impl HexParser {
                     },
             }
         }
-        Some(result)
+        if buf_full {
+            None // odd number of hexits
+        } else {
+            Some(result)
+        }
     }
 }