1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156

use crate::{Error, Result};
use bitfield::bitfield;
use std::{fmt, str::FromStr};

#[derive(Debug, Clone, PartialEq)]
pub enum Zone {
    Data,
    Config,
}

impl FromStr for Zone {
    type Err = Error;

    fn from_str(s: &str) -> Result<Self> {
        match s.to_lowercase().as_str() {
            "data" => Ok(Self::Data),
            "config" => Ok(Self::Config),
            _ => Err(Error::invalid_address()),
        }
    }
}

impl fmt::Display for Zone {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            Self::Config => f.write_str("config"),
            Self::Data => f.write_str("data"),
        }
    }
}

#[derive(Debug, PartialEq)]
pub enum DataBuffer {
    TempKey,
    MessageDigest,
    AlternateKey,
}

impl From<&DataBuffer> for u8 {
    fn from(v: &DataBuffer) -> Self {
        match v {
            DataBuffer::TempKey => 0,
            DataBuffer::MessageDigest => 1,
            DataBuffer::AlternateKey => 2,
        }
    }
}

impl From<u8> for DataBuffer {
    fn from(v: u8) -> Self {
        match v & 3 {
            0 => Self::TempKey,
            1 => Self::MessageDigest,
            2 => Self::AlternateKey,
            _ => unreachable!(),
        }
    }
}

#[derive(Debug, PartialEq, Clone)]
pub enum Address {
    Otp(OffsetAddress),
    Config(OffsetAddress),
    Data(DataAddress),
}

bitfield! {
    #[derive(PartialEq, Clone)]
    pub struct OffsetAddress(u16);
    impl Debug;
    u8, offset, set_offset: 10, 8;
    u8, block, set_block: 12, 11;
}

bitfield! {
    #[derive(PartialEq, Clone)]
    pub struct DataAddress(u16);
    impl Debug;
    u8, block, set_block: 3, 0;
    u8, offset, set_offset: 10, 8;
    u8, slot, set_slot: 14, 11;
}

impl From<&Address> for u16 {
    fn from(v: &Address) -> Self {
        match v {
            Address::Otp(addr) => addr.0,
            Address::Config(addr) => addr.0,
            Address::Data(addr) => addr.0,
        }
    }
}

impl Address {
    pub fn otp(block: u8, offset: u8) -> Result<Self> {
        if block > 4 || offset > 7 {
            return Err(Error::invalid_address());
        }
        let mut address = OffsetAddress(0);
        address.set_block(block);
        address.set_offset(offset);
        Ok(Self::Otp(address))
    }

    pub fn config(block: u8, offset: u8) -> Result<Self> {
        if block > 4 || offset > 7 {
            return Err(Error::invalid_address());
        }
        let mut address = OffsetAddress(0);
        address.set_block(block);
        address.set_offset(offset);
        Ok(Self::Config(address))
    }

    pub fn slot_config(slot: u8) -> Result<Self> {
        if slot > 15 {
            return Err(Error::invalid_address());
        }
        let (block, offset) = if slot <= 5 {
            (0, (20 + slot * 2) >> 2)
        } else {
            (1, ((slot - 5) * 2) >> 2)
        };
        Self::config(block, offset)
    }

    pub fn key_config(slot: u8) -> Result<Self> {
        if slot > 15 {
            return Err(Error::invalid_address());
        }
        Self::config(3, (slot * 2) >> 2)
    }

    pub fn data(slot: u8, block: u8, offset: u8) -> Result<Self> {
        if slot > 15
            || (slot < 8 && block > 1)
            || (slot == 8 && block > 15)
            || (slot > 8 && block > 7)
        {
            return Err(Error::invalid_address());
        }
        let mut address = DataAddress(0);
        address.set_block(block);
        address.set_offset(offset);
        address.set_slot(slot);
        Ok(Self::Data(address))
    }

    pub fn zone(&self) -> u8 {
        match self {
            Self::Config(_) => 0x00,
            Self::Otp(_) => 0x01,
            Self::Data(_) => 0x02,
        }
    }
}