implement card model

src/card/decoder.rs

@@ -1,5 +1,7 @@
-use alloc::string::{String, ToString};
+use core::fmt::Display;
+
 use crate::card::model::NfcPayload;
+use alloc::string::{String, ToString};
 
 pub fn split_nfc_hex(payload: &[u8]) -> Option<NfcPayload<'_>> {
     if payload.len() < 0x35A {
@@ -18,13 +20,34 @@ pub fn split_nfc_hex(payload: &[u8]) -> Option<NfcPayload<'_>> {
     })
 }
 
-pub fn decode_known_event(event_encoding: &[u8]) -> Option<&'static str> {
+#[derive(Debug, Clone)]
+pub enum Events {
+    CCC39,
+    CCC40,
+    GPN24,
+    GPN25,
+    Unknown,
+}
+
+impl Display for Events {
+    fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
+        match *self {
+            Events::CCC39 => write!(f, "39C3"),
+            Events::CCC40 => write!(f, "40C3"),
+            Events::GPN24 => write!(f, "GPN24"),
+            Events::GPN25 => write!(f, "GPN25"),
+            Events::Unknown => write!(f, "Unknown"),
+        }
+    }
+}
+
+pub fn decode_known_event(event_encoding: &[u8]) -> Events {
     match event_encoding {
-        [0x39, 0xC3] => Some("39C3"),
-        [0x40, 0xC3] => Some("40C3"), // future proofing :)
-        [0xE9, 0x24] => Some("GPN 24"),
-        [0xE9, 0x25] => Some("GPN 25"), // future proofing :)
-        _ => None,
+        [0x39, 0xC3] => Events::CCC39,
+        [0x40, 0xC3] => Events::CCC40, // future proofing :)
+        [0xE9, 0x24] => Events::GPN24,
+        [0xE9, 0x25] => Events::GPN25, // future proofing :)
+        _ => Events::Unknown,
     }
 }