clvm_traits/
match_byte.rs

1use clvmr::Atom;
2
3use crate::{ClvmDecoder, ClvmEncoder, FromClvm, FromClvmError, ToClvm, ToClvmError};
4
5#[derive(Debug, Copy, Clone)]
6pub struct MatchByte<const BYTE: u8>;
7
8impl<N, E: ClvmEncoder<Node = N>, const BYTE: u8> ToClvm<E> for MatchByte<BYTE> {
9    fn to_clvm(&self, encoder: &mut E) -> Result<N, ToClvmError> {
10        encoder.encode_atom(Atom::Borrowed(if BYTE == 0 {
11            &[]
12        } else if BYTE < 0x80 {
13            &[BYTE]
14        } else {
15            &[0, BYTE]
16        }))
17    }
18}
19
20impl<N, D: ClvmDecoder<Node = N>, const BYTE: u8> FromClvm<D> for MatchByte<BYTE> {
21    fn from_clvm(decoder: &D, node: N) -> Result<Self, FromClvmError> {
22        match decoder.decode_atom(&node)?.as_ref() {
23            [] if BYTE == 0 => Ok(Self),
24            [byte] if *byte == BYTE && BYTE > 0 && BYTE < 0x80 => Ok(Self),
25            [0, byte] if *byte == BYTE && BYTE >= 0x80 => Ok(Self),
26            _ => Err(FromClvmError::Custom(format!(
27                "expected an atom with a single byte value of {BYTE}"
28            ))),
29        }
30    }
31}
32
33#[cfg(test)]
34mod tests {
35    use clvmr::Allocator;
36
37    use super::*;
38
39    fn test_byte<const BYTE: u8>() {
40        let mut allocator = Allocator::new();
41        let match_byte = MatchByte::<BYTE>;
42        let encoded = match_byte.to_clvm(&mut allocator).unwrap();
43        MatchByte::<BYTE>::from_clvm(&allocator, encoded).unwrap();
44    }
45
46    macro_rules! test_bytes {
47        ( $( $byte:expr ),* ) => {
48            $( test_byte::<$byte>(); )*
49        };
50    }
51
52    #[test]
53    fn test_bytes() {
54        test_bytes!(
55            0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
56            24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45,
57            46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67,
58            68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89,
59            90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108,
60            109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125,
61            126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142,
62            143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159,
63            160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176,
64            177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191, 192, 193,
65            194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207, 208, 209, 210,
66            211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223, 224, 225, 226, 227,
67            228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244,
68            245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255
69        );
70    }
71}
clvm_traits/match_byte.rs

clvm_traits/
match_byte.rs
