tkeyclient 0.1.0

A crate for controlling a Tillitis TKey, uploading device apps, and communicating with it
Documentation 
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#![allow(dead_code)]

use num_enum::{TryFromPrimitive, TryFromPrimitiveError};

use crate::{Error, Result};

#[derive(Debug)]
pub struct NameVersion {
    pub name0: String,
    pub name1: String,
    pub version: u32,
}

pub struct TkeyFrame {
    pub(crate) header: TKeyFrameHeader,
    pub(crate) code: u8,
    pub(crate) data: Vec<u8>,
}

#[derive(Debug)]
pub struct TKeyFrameHeader {
    pub(crate) id: u8,
    pub(crate) endpoint: Endpoint,
    pub(crate) cmd_len: CmdLen,
    // pub responseNotOK: bool,
}

#[derive(Debug, TryFromPrimitive)]
#[repr(u8)]
pub enum Endpoint {
    DestFW = 2,
    DestApp = 3,
}

#[derive(Debug, TryFromPrimitive)]
#[repr(u8)]
pub enum CmdLen {
    CmdLen1 = 0,
    CmdLen4 = 1,
    CmdLen32 = 2,
    CmdLen128 = 3,
}

impl CmdLen {
    pub fn byte_len(&self) -> u8 {
        match self {
            CmdLen::CmdLen1 => 1,
            CmdLen::CmdLen4 => 4,
            CmdLen::CmdLen32 => 32,
            CmdLen::CmdLen128 => 128,
        }
    }
}

impl TKeyFrameHeader {
    pub fn parse(b: u8) -> Result<Self> {
        if (b & 0b1000_0000) != 0 {
            return Err(Error::TkeySerialFrameHeaderParsingFailed("".to_string()));
        }

        if (b & 0b0000_0100) != 0 {
            return Err(Error::TkeySerialFrameHeaderParsingFailed("".to_string()));
        }

        Ok(Self {
            id: (b & 0b0110_0000) >> 5,
            endpoint: ((b & 0b0001_1000) >> 3).try_into().map_err(
                |e: TryFromPrimitiveError<Endpoint>| {
                    Error::TkeySerialFrameHeaderParsingFailed(e.to_string())
                },
            )?,
            cmd_len: (b & 0b0000_0011)
                .try_into()
                .map_err(|e: TryFromPrimitiveError<CmdLen>| {
                    Error::TkeySerialFrameHeaderParsingFailed(e.to_string())
                })?,
        })
    }
}