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
use super::H256;
use crate::{H160Hash, Hashable};
use rand::Rng;
use serde::{Deserialize, Serialize};
#[derive(Clone, Copy, Default, Deserialize, Eq, Hash, PartialEq, Serialize)]
pub struct H160(pub H160Hash); impl H160 {
pub fn new(data: H160Hash) -> Self {
Self(data)
}
pub fn generate() -> Self {
let mut rng = rand::thread_rng();
let random_bytes: Vec<u8> = (0..20).map(|_| rng.gen()).collect();
let mut raw_bytes = [0; 20];
raw_bytes.copy_from_slice(&random_bytes);
(&raw_bytes).into()
}
}
impl Hashable for H160 {
fn hash(&self) -> H256 {
(*self).into()
}
}
impl std::convert::From<&H160Hash> for H160 {
fn from(input: &H160Hash) -> H160 {
let mut buffer: H160Hash = [0; 20];
buffer[..].copy_from_slice(input);
H160(buffer)
}
}
impl std::convert::From<H160Hash> for H160 {
fn from(input: H160Hash) -> H160 {
H160(input)
}
}
impl std::convert::From<&H256> for H160 {
fn from(input: &H256) -> H160 {
let mut buffer: H160Hash = [0; 20];
buffer[..].copy_from_slice(&input.0[0..20]);
buffer.into()
}
}
impl std::convert::From<H256> for H160 {
fn from(input: H256) -> H160 {
let mut buffer: H160Hash = [0; 20];
buffer[..].copy_from_slice(&input.0[0..20]);
buffer.into()
}
}
impl std::fmt::Debug for H160 {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
write!(
f,
"{:>02x}{:>02x}..{:>02x}{:>02x}",
&self.0[0], &self.0[1], &self.0[18], &self.0[19]
)
}
}
impl std::fmt::Display for H160 {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
let start = if let Some(precision) = f.precision() {
if precision >= 40 {
0
} else {
20 - precision / 2
}
} else {
0
};
for byte_idx in start..20 {
write!(f, "{:>02x}", &self.0[byte_idx])?;
}
Ok(())
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_h160_random() {
let a = H160::generate();
let b = H160::from(crate::hash::generate_random_hash());
assert_ne!(a, b)
}
}