alloy-primitives 0.7.0

Ethereum primitive types
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

use crate::FixedBytes;
use alloc::vec::Vec;
use ssz::{Decode, DecodeError, Encode};

impl<const N: usize> Encode for FixedBytes<N> {
    #[inline]
    fn is_ssz_fixed_len() -> bool {
        true
    }

    #[inline]
    fn ssz_bytes_len(&self) -> usize {
        N
    }

    #[inline]
    fn ssz_fixed_len() -> usize {
        N
    }

    #[inline]
    fn ssz_append(&self, buf: &mut Vec<u8>) {
        buf.extend_from_slice(&self.0);
    }

    #[inline]
    fn as_ssz_bytes(&self) -> Vec<u8> {
        self.0.to_vec()
    }
}

impl<const N: usize> Decode for FixedBytes<N> {
    fn is_ssz_fixed_len() -> bool {
        true
    }

    fn ssz_fixed_len() -> usize {
        N
    }

    fn from_ssz_bytes(bytes: &[u8]) -> Result<Self, DecodeError> {
        if bytes.len() != N {
            return Err(DecodeError::InvalidByteLength { len: bytes.len(), expected: N });
        }

        let mut fixed_array = [0u8; N];
        fixed_array.copy_from_slice(bytes);

        Ok(Self(fixed_array))
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::{Address, Bloom};

    macro_rules! test_encode_decode_ssz {
        ($test_name:ident, $type:ty, [$( $value:expr ),*]) => {
            #[test]
            fn $test_name() {
                $(
                    let expected: $type = $value;
                    let encoded = ssz::Encode::as_ssz_bytes(&expected);
                    let actual: $type = ssz::Decode::from_ssz_bytes(&encoded).unwrap();
                    assert_eq!(expected, actual, "Failed for value: {:?}", $value);
                )*
            }
        };
    }

    test_encode_decode_ssz!(
        test_encode_decode_fixed_bytes32,
        FixedBytes<32>,
        [fixed_bytes!("a1de988600a42c4b4ab089b619297c17d53cffae5d5120d82d8a92d0bb3b78f2")]
    );

    test_encode_decode_ssz!(
        test_encode_decode_fixed_bytes4,
        FixedBytes<4>,
        [fixed_bytes!("01234567")]
    );

    test_encode_decode_ssz!(
        test_encode_decode_bloom,
        Bloom,
        [bloom!(
            "00000000000000000000000000000000
             00000000100000000000000000000000
             00000000000000000000000000000000
             00000000000000000000000000000000
             00000000000000000000000000000000
             00000000000000000000000000000000
             00000002020000000000000000000000
             00000000000000000000000800000000
             10000000000000000000000000000000
             00000000000000000000001000000000
             00000000000000000000000000000000
             00000000000000000000000000000000
             00000000000000000000000000000000
             00000000000000000000000000000000
             00000000000000000000000000000000
             00000000000000000000000000000000"
        )]
    );
    test_encode_decode_ssz!(
        test_encode_decode_address,
        Address,
        [
            address!("2222222222222222222222222222222222222222"),
            address!("0000000000000000000000000000000000012321"),
            address!("0000000000000000000000000000000000000000")
        ]
    );

    #[test]
    fn test_ssz_fixed_lengths() {
        assert_eq!(<u64 as Encode>::ssz_fixed_len(), 8);
        assert_eq!(<u64 as Decode>::ssz_fixed_len(), 8);

        assert_eq!(<[u8; 32] as Encode>::ssz_fixed_len(), 32);
        assert_eq!(<[u8; 32] as Decode>::ssz_fixed_len(), 32);

        assert_eq!(<Bloom as Encode>::ssz_fixed_len(), 256);
        assert_eq!(<Bloom as Decode>::ssz_fixed_len(), 256);

        assert_eq!(<Address as Encode>::ssz_fixed_len(), 20);
        assert_eq!(<Address as Decode>::ssz_fixed_len(), 20);

        assert_eq!(<FixedBytes<32> as Encode>::ssz_fixed_len(), 32);
        assert_eq!(<FixedBytes<32> as Decode>::ssz_fixed_len(), 32);

        assert_eq!(<FixedBytes<4> as Encode>::ssz_fixed_len(), 4);
        assert_eq!(<FixedBytes<4> as Decode>::ssz_fixed_len(), 4);
    }
}