valip 0.4.0

Parsing of ip addresses from bytes representing strings
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

use crate::errors::Error;
use crate::hex::hex_byte_to_byte_value;

const MAC_BYTE_SIZE: usize = 6;
const MAC_READABLE_SIZE: usize = 17;

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub struct Mac {
    raw: [u8; MAC_BYTE_SIZE],
}

impl Mac {
    /// Create a new mac address from the given raw bytes.
    pub const fn new(raw: [u8; MAC_BYTE_SIZE]) -> Mac {
        Mac { raw }
    }

    /// Parse ASCII bytes to a mac address.
    pub fn parse(input: &[u8]) -> Result<Mac, Error> {
        if input.len() < MAC_READABLE_SIZE {
            return Err(Error::InputTooShort);
        }
        if input.len() > MAC_READABLE_SIZE {
            return Err(Error::InputTooLong);
        }

        let mut bytes = 0;
        let mut raw = [0; MAC_BYTE_SIZE];

        for byte in input.split(|&c| c == b':') {
            if bytes >= MAC_BYTE_SIZE {
                return Err(Error::TooManyOctets);
            }
            if byte.len() != 2 {
                // TODO
                return Err(Error::IllegalCharacter);
            }

            raw[bytes] = hex_byte_to_byte_value(byte[0])? << 4 | hex_byte_to_byte_value(byte[1])?;
            bytes += 1;
        }

        if bytes != MAC_BYTE_SIZE {
            return Err(Error::InsufficientOctets);
        }

        Ok(Mac { raw })
    }
}

#[cfg(test)]
mod tests {
    use super::Mac;
    use crate::errors::Error;

    #[test]
    fn parse_mac() {
        assert_eq!(
            Mac::parse("00:00:ec:00:5e:20".as_bytes()),
            Ok(Mac::new([0, 0, 236, 0, 94, 32]))
        );
        assert_eq!(
            Mac::parse("00:00:ec:00:5e".as_bytes()),
            Err(Error::InputTooShort),
        );
        assert_eq!(
            Mac::parse("00:00:ec:00:5e:20:32".as_bytes()),
            Err(Error::InputTooLong),
        );
        assert_eq!(
            Mac::parse("00:00:ece:00:5:20".as_bytes()),
            Err(Error::IllegalCharacter),
        );
        assert_eq!(
            Mac::parse("00:00:ec:0g:5e:20".as_bytes()),
            Err(Error::IllegalCharacter),
        );
    }
}