[io] : fix get_data function

Author: sportron-ledger

ledger_device_sdk/src/io.rs

@@ -558,25 +558,26 @@ impl Comm {
     }
 
     pub fn get_data(&self) -> Result<&[u8], StatusWords> {
-        if self.rx_length == 5 {
+        if self.rx == 4 {
             Ok(&[]) // Conforming zero-data APDU
         } else {
-            let first_len_byte = self.io_buffer[5] as usize;
+            let first_len_byte = self.apdu_buffer[4] as usize;
             let get_data_from_buffer = |len, offset| {
-                if len == 0 || len + offset > self.rx_length {
+                if len == 0 || len + offset > self.rx {
                     Err(StatusWords::BadLen)
                 } else {
-                    Ok(&self.io_buffer[offset..offset + len])
+                    Ok(&self.apdu_buffer[offset..offset + len])
                 }
             };
-            match (first_len_byte, self.rx_length) {
-                (0, 6) => Ok(&[]), // Non-conforming zero-data APDU
-                (0, 7) => Err(StatusWords::BadLen),
+            match (first_len_byte, self.rx) {
+                (0, 5) => Ok(&[]), // Non-conforming zero-data APDU
+                (0, 6) => Err(StatusWords::BadLen),
                 (0, _) => {
-                    let len = u16::from_le_bytes([self.io_buffer[6], self.io_buffer[7]]) as usize;
-                    get_data_from_buffer(len, 8)
+                    let len =
+                        u16::from_le_bytes([self.apdu_buffer[5], self.apdu_buffer[6]]) as usize;
+                    get_data_from_buffer(len, 7)
                 }
-                (len, _) => get_data_from_buffer(len, 6),
+                (len, _) => get_data_from_buffer(len, 5),
             }
         }
     }