apdu_core/
response.rs

1use crate::Error;
2
3/// An response that was received from the card
4#[derive(Debug, Default)]
5pub struct Response<'a> {
6    pub payload: &'a [u8],
7    pub trailer: (u8, u8),
8}
9
10impl<'a> Response<'a> {
11    /// Creates an empty response.
12    pub fn new() -> Self {
13        Default::default()
14    }
15
16    /// Determines whether the response indicates success or not.
17    pub fn is_ok(&self) -> bool {
18        matches!(self.trailer, (0x90, 0x00) | (0x91, 0x00))
19    }
20}
21
22impl<'a> From<&'a [u8]> for Response<'a> {
23    fn from(bytes: &'a [u8]) -> Self {
24        let len = bytes.len();
25        if len < 2 {
26            return Self {
27                payload: bytes,
28                trailer: (0, 0),
29            };
30        }
31
32        let sw2 = bytes[len - 1];
33        let sw1 = bytes[len - 2];
34
35        Self {
36            payload: &bytes[..len - 2],
37            trailer: (sw1, sw2),
38        }
39    }
40}
41
42#[cfg(feature = "std")]
43impl<'a> From<Response<'a>> for Result<&'a [u8], Error<'a>> {
44    /// Converts the response to a result of octets.
45    fn from(response: Response<'a>) -> Self {
46        let is_ok = response.is_ok();
47
48        match is_ok {
49            true => Ok(response.payload),
50            _ => Err(Error { response }),
51        }
52    }
53}
apdu_core/response.rs

apdu_core/
response.rs
