blob: 2c80b895b18e55aef5440f1760b61f1e1a26c49a (
plain)
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
|
use super::Uint;
impl<const LIMBS: usize> Uint<LIMBS> {
/// Construct a `Uint<T>` from the unsigned integer value,
/// truncating the upper bits if the value is too large to be
/// represented.
#[inline(always)]
pub const fn resize<const T: usize>(&self) -> Uint<T> {
let mut res = Uint::ZERO;
let mut i = 0;
let dim = if T < LIMBS { T } else { LIMBS };
while i < dim {
res.limbs[i] = self.limbs[i];
i += 1;
}
res
}
}
#[cfg(test)]
mod tests {
use crate::{U128, U64};
#[test]
fn resize_larger() {
let u = U64::from_be_hex("AAAAAAAABBBBBBBB");
let u2: U128 = u.resize();
assert_eq!(u2, U128::from_be_hex("0000000000000000AAAAAAAABBBBBBBB"));
}
#[test]
fn resize_smaller() {
let u = U128::from_be_hex("AAAAAAAABBBBBBBBCCCCCCCCDDDDDDDD");
let u2: U64 = u.resize();
assert_eq!(u2, U64::from_be_hex("CCCCCCCCDDDDDDDD"));
}
}
|
