uds_protocol 0.0.2

A library for encoding and decoding UDS (ISO 14229) messages
Documentation 
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
157
158
159
160
161
162
163
164
165

use crate::{Error, WireFormat};
use byteorder::{BigEndian, ReadBytesExt, WriteBytesExt};

#[macro_export]
macro_rules! unsigned_primitive_wire_format {
    ( $($primitive:ty), * ) => {
        $(
        impl WireFormat for $primitive {
            fn decode<T: std::io::Read>(reader: &mut T) -> Result<Option<Self>, Error> {
                let value: $primitive = reader
                    .read_uint128::<BigEndian>(std::mem::size_of::<$primitive>())?
                    .try_into()
                    .expect("Failed to convert value to the target primitive type");
                Ok(Some(value))
            }
            fn required_size(&self) -> usize {
                std::mem::size_of::<$primitive>()
            }
            fn encode<W: std::io::Write>(&self, writer: &mut W) -> Result<usize, Error> {
                writer.write_uint128::<BigEndian>(u128::from(*self), self.required_size())?;
                Ok(self.required_size())
            }
        }
    )*
    };
}

unsigned_primitive_wire_format!(u8, u16, u32, u64, u128);

#[macro_export]
macro_rules! signed_primitive_wire_format {
    ( $($primitive:ty), * ) => {
        $(
        impl WireFormat for $primitive {
            fn decode<T: std::io::Read>(reader: &mut T) -> Result<Option<Self>, Error> {
                let value: $primitive = reader
                    .read_int128::<BigEndian>(std::mem::size_of::<$primitive>())?
                    .try_into()
                    .expect("Failed to convert value to the target primitive type");
                Ok(Some(value))
            }
            fn required_size(&self) -> usize {
                std::mem::size_of::<$primitive>()
            }
            fn encode<W: std::io::Write>(&self, writer: &mut W) -> Result<usize, Error> {
                writer.write_int128::<BigEndian>(i128::from(*self), self.required_size())?;
                Ok(self.required_size())
            }
        }
    )*
    };
}

signed_primitive_wire_format!(i8, i16, i32, i64, i128);

impl WireFormat for f32 {
    fn decode<T: std::io::Read>(reader: &mut T) -> Result<Option<Self>, Error> {
        let value: f32 = reader.read_f32::<BigEndian>()?;
        Ok(Some(value))
    }
    fn required_size(&self) -> usize {
        4
    }
    fn encode<W: std::io::Write>(&self, writer: &mut W) -> Result<usize, Error> {
        writer.write_f32::<BigEndian>(*self)?;
        Ok(self.required_size())
    }
}

impl WireFormat for f64 {
    fn decode<T: std::io::Read>(reader: &mut T) -> Result<Option<Self>, Error> {
        let value: f64 = reader.read_f64::<BigEndian>()?;
        Ok(Some(value))
    }
    fn required_size(&self) -> usize {
        8
    }
    fn encode<W: std::io::Write>(&self, writer: &mut W) -> Result<usize, Error> {
        writer.write_f64::<BigEndian>(*self)?;
        Ok(self.required_size())
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_u8() {
        // Read some bytes
        let data = vec![0xFF];
        let mut reader = &data[..];

        let u8_byte = u8::decode(&mut reader).unwrap().unwrap();
        assert_eq!(u8_byte, 0xFF);
        assert_eq!(u8_byte.required_size(), 1);

        let mut write_buffer = vec![];
        u8_byte.encode(&mut write_buffer).unwrap();
        assert_eq!(write_buffer, data);
    }

    #[test]
    fn test_u16() {
        // Read some bytes
        let data = vec![0xFF, 0x01];
        let mut reader = &data[..];

        let u16_byte = u16::decode(&mut reader).unwrap().unwrap();
        assert_eq!(u16_byte, 0xFF01);
        assert_eq!(u16_byte.required_size(), 2);

        let mut write_buffer = vec![];
        u16_byte.encode(&mut write_buffer).unwrap();
        assert_eq!(write_buffer, data);
    }

    #[test]
    fn test_u32() {
        // Read some bytes
        let data = vec![0xFF, 0x20, 0x02, 0x01];
        let mut reader = &data[..];

        let u32_byte = u32::decode(&mut reader).unwrap().unwrap();
        assert_eq!(u32_byte, 0xFF20_0201);
        assert_eq!(u32_byte.required_size(), 4);

        let mut write_buffer = vec![];
        u32_byte.encode(&mut write_buffer).unwrap();
        assert_eq!(write_buffer, data);
    }

    #[test]
    fn test_u64() {
        // Read some bytes
        let data = vec![0xFF, 0x20, 0x02, 0x01, 0xFF, 0x20, 0x02, 0x01];
        let mut reader = &data[..];

        let u64_byte = u64::decode(&mut reader).unwrap().unwrap();
        assert_eq!(u64_byte, 0xFF20_0201_FF20_0201);
        assert_eq!(u64_byte.required_size(), 8);

        let mut write_buffer = vec![];
        u64_byte.encode(&mut write_buffer).unwrap();
        assert_eq!(write_buffer, data);
    }

    #[test]
    fn test_u128() {
        // Read some bytes
        let data = vec![
            0xFF, 0x20, 0x02, 0x01, 0xFF, 0x20, 0x02, 0x01, 0xFF, 0x20, 0x02, 0x01, 0xFF, 0x20,
            0x02, 0x01,
        ];
        let mut reader = &data[..];

        let u128_byte = u128::decode(&mut reader).unwrap().unwrap();
        assert_eq!(u128_byte, 0xFF20_0201_FF20_0201_FF20_0201_FF20_0201);
        assert_eq!(u128_byte.required_size(), 16);

        let mut write_buffer = vec![];
        u128_byte.encode(&mut write_buffer).unwrap();
        assert_eq!(write_buffer, data);
    }
}