storage: implement get card by uuid

src/card/decoder.rs

@@ -3,20 +3,20 @@ use core::fmt::Display;
 use crate::card::model::NfcPayload;
 use alloc::string::{String, ToString};
 
-pub fn split_nfc_hex(payload: &[u8]) -> Option<NfcPayload<'_>> {
+pub fn split_nfc_hex(payload: &[u8]) -> Option<NfcPayload> {
     if payload.len() < 0x35A {
         return None;
     }
 
     Some(NfcPayload {
-        event_encoding: &payload[0..2],
+        event_encoding: payload[0..2].try_into().ok()?,
         card_type: payload[2],
-        card_uuid: &payload[3..5],
-        _reserved: &payload[5..9],
-        sprite: &payload[9..0x2DB],
-        packed_card_text: &payload[0x2DB..0x311],
-        secret: &payload[0x311..0x329],
-        _opaque_trailer: &payload[0x329..0x35A],
+        card_uuid: payload[3..5].try_into().ok()?,
+        _reserved: payload[5..9].try_into().ok()?,
+        sprite: payload[9..0x2DB].try_into().ok()?,
+        packed_card_text: payload[0x2DB..0x311].try_into().ok()?,
+        secret: payload[0x311..0x329].try_into().ok()?,
+        _opaque_trailer: payload[0x329..0x35A].try_into().ok()?,
     })
 }
 

src/card/model.rs

@@ -6,16 +6,19 @@ use num_enum::FromPrimitive;
 use crate::card::decoder::{Events, decode_known_event, decode_packed_card_text, decode_secret};
 use embedded_graphics::pixelcolor::{Rgb565, Rgb888};
 
-#[derive(Debug, Clone, Copy)]
-pub struct NfcPayload<'a> {
-    pub event_encoding: &'a [u8],
+use binary_serde::BinarySerde;
+
+#[derive(Debug, BinarySerde, PartialEq, Eq, Clone, Copy)]
+#[repr(C)]
+pub struct NfcPayload {
+    pub event_encoding: [u8; 2],
     pub card_type: u8,
-    pub card_uuid: &'a [u8],
-    pub _reserved: &'a [u8],
-    pub sprite: &'a [u8],
-    pub packed_card_text: &'a [u8],
-    pub secret: &'a [u8],
-    pub _opaque_trailer: &'a [u8],
+    pub card_uuid: [u8; 2],
+    pub _reserved: [u8; 4],
+    pub sprite: [u8; 722],
+    pub packed_card_text: [u8; 54],
+    pub secret: [u8; 24],
+    pub _opaque_trailer: [u8; 49],
 }
 
 #[derive(Debug, Clone, Eq, PartialEq, FromPrimitive)]
@@ -235,15 +238,15 @@ pub struct Card {
     pub sprite: Sprite,
 }
 
-impl<'a> TryFrom<NfcPayload<'a>> for Card {
+impl<'a> TryFrom<NfcPayload> for Card {
     type Error = &'static str;
 
-    fn try_from(payload: NfcPayload<'a>) -> Result<Self, Self::Error> {
+    fn try_from(payload: NfcPayload) -> Result<Self, Self::Error> {
         let uuid: String = "empty for now".into(); //str::from_utf8(payload.card_uuid).unwrap().into();
-        let event = decode_known_event(payload.event_encoding);
+        let event = decode_known_event(&payload.event_encoding);
         let cardtype = CardType::from(payload.card_type);
-        let (name, trait1, trait2, trait3) = decode_packed_card_text(payload.packed_card_text);
-        let secret = decode_secret(payload.secret);
+        let (name, trait1, trait2, trait3) = decode_packed_card_text(&payload.packed_card_text);
+        let secret = decode_secret(&payload.secret);
         let sprite = Sprite {
             data: payload.sprite.to_vec(),
         };

src/storage/cardstore.rs

@@ -1,10 +1,11 @@
-use alloc::collections::BTreeMap; use embedded_storage::nor_flash::ReadNorFlash;
+use alloc::collections::BTreeMap; 
 use alloc::vec::Vec;
 
-use binary_serde::{BinarySerde, Endianness};
+use binary_serde::{BinarySerde, Endianness, DeserializeError};
 
 //use crate::card::model::NfcPayload;
 
+use crate::card::model::NfcPayload;
 use crate::storage::store::{Store, StoreError};
 
 use crate::storage::{MemoryRegion,CARDSTORE_REGION};
@@ -15,7 +16,7 @@ const COUNT_REGION: MemoryRegion = MemoryRegion { offset: CARDSTORE_REGION.offse
 
 #[derive(Debug, BinarySerde, Default, PartialEq, Eq)]
 #[repr(C)]
-struct AllocationTableEntry {
+pub struct AllocationTableEntry {
     uuid: u32,
     offset: u32,
 
@@ -36,14 +37,33 @@ const ALLOCATION_TABLE_REGION: MemoryRegion = MemoryRegion {offset: COUNT_REGION
 
 const CARDS_REGION: MemoryRegion = MemoryRegion { offset: ALLOCATION_TABLE_REGION.end() as u32, size: CARDSTORE_REGION.size - ALLOCATION_TABLE_REGION.end()};
 
+#[derive(Debug)]
+pub enum CardStoreError {
+    Store(StoreError),
+    CorruptedEntry(DeserializeError),
+    NoEntry
+}
+
+impl From<StoreError> for CardStoreError {    
+    fn from(error: StoreError) -> CardStoreError { 
+        CardStoreError::Store(error)    
+    }
+}
+
+impl From<DeserializeError> for CardStoreError {    
+    fn from(error: DeserializeError) -> CardStoreError { 
+        CardStoreError::CorruptedEntry(error)    
+    }
+}
+
 pub struct CardStore {
     store: Store,
     count: usize,
-    allocation_table: BTreeMap<u32, AllocationTableEntry>
+    pub allocation_table: BTreeMap<u32, AllocationTableEntry>
 }
 
 impl CardStore {
-    pub fn new(mut store: Store) -> Result<Self, StoreError> {
+    pub fn new(mut store: Store) -> Result<Self, CardStoreError> {
         let mut count_bytes: [u8; COUNT_REGION.size] = [0; COUNT_REGION.size];
 
         store.read(COUNT_REGION.offset,  &mut count_bytes)?;
@@ -59,15 +79,20 @@ impl CardStore {
 
         let mut allocation_table = BTreeMap::<u32, AllocationTableEntry>::new();
         for chunk in chunks {
-            let allocation_table_entry = AllocationTableEntry::binary_deserialize(chunk.as_ref(), Endianness::Little).unwrap();
+            let allocation_table_entry = AllocationTableEntry::binary_deserialize(chunk.as_ref(), Endianness::Little)?;
             allocation_table.insert(allocation_table_entry.uuid, allocation_table_entry);
         }
 
         Ok(Self { store, count, allocation_table })
     }
 
-    //fn get_card_by_uuid(uuid: &str) {}
+    pub fn get_card_by_uuid(&mut self, uuid: u32) -> Result<NfcPayload, CardStoreError> {
+        let entry = self.allocation_table.get(&uuid).ok_or(CardStoreError::NoEntry)?;
 
-    //fn get_card_by_position(position: usize) {}
+        let mut payload: [u8; size_of::<NfcPayload>()] = [0; size_of::<NfcPayload>()];
+        self.store.read(entry.offset, &mut payload)?;
+
+        Ok(NfcPayload::binary_deserialize(payload.as_ref(), Endianness::Little)?)
+    }
 
 }