desox 0.1.2

(incomplete) MIFARE DESFire EV3 APDU bindings.
Documentation 
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// {{{ Copyright (c) Paul R. Tagliamonte <paultag@gmail.com>, 2026
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE. }}}

use crate::{
    Error, Instruction, KeyCount, KeyId, KeySettings, StatusCode,
    client::{AuthenticationState, Card, CardIoDefault},
    io,
};

impl<'card, IoBackendT, AuthenticationStateT> Card<'card, IoBackendT, AuthenticationStateT>
where
    AuthenticationStateT: AuthenticationState,
    IoBackendT: io::Backend,
    Self: CardIoDefault<IoBackendT>,
{
    /// Get information about the key settings. This returns the key settings
    /// bits (0th element of the returned tuple), as well as the number
    /// of keys present (1st element of the returned tuple).
    pub async fn get_key_settings(
        &mut self,
    ) -> Result<(KeySettings, KeyCount), Error<IoBackendT::Error>> {
        let mut out = [0; 0xff];
        let (status_code, &[key_settings, num_keys]) = self
            .default_exchange(&mut out, &[Instruction::GetKeySettings as u8])
            .await?
        else {
            return Err(Error::BadSize);
        };

        if status_code != StatusCode::Ack {
            return Err(Error::BadStatusCode);
        }

        Ok((
            KeySettings::from_u8(key_settings),
            KeyCount::from_u8(num_keys)?,
        ))
    }

    /// Return the version of a Key by ID
    pub async fn get_key_version(&mut self, key_id: KeyId) -> Result<u8, Error<IoBackendT::Error>> {
        let mut out = [0; 0xff];
        let (status_code, &[key_version]) = self
            .default_exchange(&mut out, &[Instruction::GetKeyVersion as u8, key_id])
            .await?
        else {
            return Err(Error::BadSize);
        };

        if status_code != StatusCode::Ack {
            return Err(Error::BadStatusCode);
        }

        Ok(key_version)
    }
}

// vim: foldmethod=marker