ps-ecc 0.1.0-9

Generates Reed-Solomon error correction codes.
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

use std::ops::{AddAssign, BitXorAssign};

use crate::Polynomial;

impl AddAssign for Polynomial {
    fn add_assign(&mut self, rhs: Self) {
        BitXorAssign::bitxor_assign(self, rhs);
    }
}

impl AddAssign<&Self> for Polynomial {
    fn add_assign(&mut self, rhs: &Self) {
        BitXorAssign::bitxor_assign(self, rhs);
    }
}

#[cfg(test)]
#[allow(clippy::expect_used)]
mod tests {
    use crate::Polynomial;

    #[test]
    fn add_assign_basic() {
        let mut a = Polynomial::try_from(&[1u8, 2, 3][..]).expect("valid polynomial");
        let b = Polynomial::try_from(&[4u8, 5, 6][..]).expect("valid polynomial");

        a += b;

        assert_eq!(a.coefficients(), &[1 ^ 4, 2 ^ 5, 3 ^ 6]);
    }

    #[test]
    fn add_assign_different_degrees() {
        let mut a = Polynomial::try_from(&[1u8, 2][..]).expect("valid polynomial");
        let b = Polynomial::try_from(&[3u8, 4, 5, 6][..]).expect("valid polynomial");

        a += b;

        assert_eq!(a.coefficients(), &[1 ^ 3, 2 ^ 4, 5, 6]);
    }

    #[test]
    fn add_assign_cancels_to_zero() {
        let mut a = Polynomial::try_from(&[1u8, 2, 3][..]).expect("valid polynomial");
        let b = Polynomial::try_from(&[1u8, 2, 3][..]).expect("valid polynomial");

        a += b;

        assert_eq!(a.degree(), 0);
        assert_eq!(a.coefficients(), &[0]);
    }

    #[test]
    fn add_assign_with_reference() {
        let mut a = Polynomial::try_from(&[1u8, 2, 3][..]).expect("valid polynomial");
        let b = Polynomial::try_from(&[4u8, 5, 6][..]).expect("valid polynomial");

        a += &b;

        assert_eq!(a.coefficients(), &[1 ^ 4, 2 ^ 5, 3 ^ 6]);
    }

    #[test]
    fn add_assign_multiple() {
        let mut a = Polynomial::try_from(&[1u8][..]).expect("valid polynomial");
        let b = Polynomial::try_from(&[2u8][..]).expect("valid polynomial");
        let c = Polynomial::try_from(&[4u8][..]).expect("valid polynomial");

        a += b;
        a += c;

        assert_eq!(a.coefficients(), &[1 ^ 2 ^ 4]);
    }
}