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asdeeaasphkekiesljojokjjolpjfseefapjklwifdehkhhsdswidjsjkafjdfljkihsrojedlojdjfadhasljlsrlljfssikfhjksaurhaskjdjoajjkojjdlaakhhjkksedsdhkhaifsaidkhjdjjadhhjrwpskkhjfsjidldsdkfsdsjjkshakaasklaskjjeklkskjtsfsaskdawkuasfsledajjlatakaasdldskffjpiaadhaskjasddsjfjdskdisfwpekdejdthsdudjdsshdhhsoarjlkjhkahhpihhaokjdtfjfhkukhaelshsokusksiadahjrhfsdkaskhjslhdjdwssohfsfjhsdjjsfaksphfhkawjkufsdllikpkjljusdajjddsjkpdjkjsedswurahidkijdlkakaaslsaskkhidjiakhhsrdjjrfkjthaslssipshadaasoajjfhkjdsihkhhsofdskfleljhuduajfhwjkaijfhdjfeuwrhhskpfidsdhkhhsfsuidkhskjewkuaikhljkkhedhsslhdjdhssdufjfjhskjsjlwkjlhlhdhhsriusdsjsosrsdkjjkfkjksejdshawkdsdjkjkpfsfakhdhhidjisdlojkutskplskshjkkijopkjkethkfdahdr

1 files changed, 13 insertions, 6 deletions

diff --git a/lib/src/lib.rs b/lib/src/lib.rs
index a8d48b6..b561f13 100644
--- a/lib/src/lib.rs
+++ b/lib/src/lib.rs
@@ -51,15 +51,23 @@ pub fn decode(buf: &[u8]) -> Vec<u8> {
 
     let mut out = Vec::new();
     for pair in buf.chunks(4) {
-        out.push((decode_sym(pair[0]) << 6)
-            + (decode_sym(pair[1]) << 4)
-            + (decode_sym(pair[2]) << 2)
-            + decode_sym(pair[3]));
+        if pair.len() != 4 {
+            continue;
+        }
+
+        match (decode_sym(pair[0]), decode_sym(pair[1]), decode_sym(pair[2]), decode_sym(pair[3])) {
+            (Some(zero), Some(one), Some(two), Some(three)) => out.push((zero << 6) + (one << 4) + (two << 2) + three),
+            (_, _, _, _) => {
+                // U+FFFD � REPLACEMENT CHARACTER
+                out.push(0xFF);
+                out.push(0xFD);
+            }
+        }
     }
     out
 }
 
-pub fn decode_sym(sym: u8) -> u8 {
+pub fn decode_sym(sym: u8) -> Option<u8> {
     let find = |d: &[u8; 4]| -> Option<u8> {
         d.iter().enumerate().find(|s| s.1 == &sym).map(|s| s.0 as u8)
     };
@@ -67,7 +75,6 @@ pub fn decode_sym(sym: u8) -> u8 {
         .or_else(|| find(&HOME_LEFT))
         .or_else(|| find(&ABOVE_RIGHT))
         .or_else(|| find(&ABOVE_LEFT))
-        .unwrap()
 }