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
use crate::{DekuError, DekuRead, DekuWrite};
use bitvec::prelude::*;
use std::borrow::{Borrow, Cow};
impl<'a, T, Ctx> DekuRead<'a, Ctx> for Cow<'a, T>
where
T: DekuRead<'a, Ctx> + Clone,
Ctx: Copy,
{
fn read(
input: &'a BitSlice<u8, Msb0>,
inner_ctx: Ctx,
) -> Result<(&'a BitSlice<u8, Msb0>, Self), DekuError>
where
Self: Sized,
{
let (rest, val) = <T>::read(input, inner_ctx)?;
Ok((rest, Cow::Owned(val)))
}
}
impl<T, Ctx> DekuWrite<Ctx> for Cow<'_, T>
where
T: DekuWrite<Ctx> + Clone,
Ctx: Copy,
{
fn write(&self, output: &mut BitVec<u8, Msb0>, inner_ctx: Ctx) -> Result<(), DekuError> {
(self.borrow() as &T).write(output, inner_ctx)
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::native_endian;
use rstest::rstest;
#[rstest(input, expected, expected_rest,
case(
&[0xEF, 0xBE],
Cow::Owned(native_endian!(0xBEEF_u16)),
bits![u8, Msb0;]
),
)]
fn test_cow(input: &[u8], expected: Cow<u16>, expected_rest: &BitSlice<u8, Msb0>) {
let bit_slice = input.view_bits::<Msb0>();
let (rest, res_read) = <Cow<u16>>::read(bit_slice, ()).unwrap();
assert_eq!(expected, res_read);
assert_eq!(expected_rest, rest);
let mut res_write = bitvec![u8, Msb0;];
res_read.write(&mut res_write, ()).unwrap();
assert_eq!(input.to_vec(), res_write.into_vec());
}
}