use crate::{ctx::Limit, DekuError, DekuRead, DekuWrite};
use alloc::{boxed::Box, vec::Vec};
use bitvec::prelude::*;
impl<'a, T, Ctx> DekuRead<'a, Ctx> for Box<T>
where
T: DekuRead<'a, Ctx>,
Ctx: Copy,
{
fn read(
input: &'a BitSlice<Msb0, u8>,
inner_ctx: Ctx,
) -> Result<(&'a BitSlice<Msb0, u8>, Self), DekuError>
where
Self: Sized,
{
let (rest, val) = <T>::read(input, inner_ctx)?;
Ok((rest, Box::new(val)))
}
}
impl<T, Ctx> DekuWrite<Ctx> for Box<T>
where
T: DekuWrite<Ctx>,
Ctx: Copy,
{
fn write(&self, output: &mut BitVec<Msb0, u8>, inner_ctx: Ctx) -> Result<(), DekuError> {
self.as_ref().write(output, inner_ctx)
}
}
impl<'a, T, Ctx, Predicate> DekuRead<'a, (Limit<T, Predicate>, Ctx)> for Box<[T]>
where
T: DekuRead<'a, Ctx>,
Ctx: Copy,
Predicate: FnMut(&T) -> bool,
{
fn read(
input: &'a BitSlice<Msb0, u8>,
(limit, inner_ctx): (Limit<T, Predicate>, Ctx),
) -> Result<(&'a BitSlice<Msb0, u8>, Self), DekuError>
where
Self: Sized,
{
let (rest, val) = <Vec<T>>::read(input, (limit, inner_ctx))?;
Ok((rest, val.into_boxed_slice()))
}
}
impl<T, Ctx> DekuWrite<Ctx> for Box<[T]>
where
T: DekuWrite<Ctx>,
Ctx: Copy,
{
fn write(&self, output: &mut BitVec<Msb0, u8>, ctx: Ctx) -> Result<(), DekuError> {
for v in self.as_ref() {
v.write(output, ctx)?;
}
Ok(())
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::ctx::*;
use rstest::rstest;
#[rstest(input, expected, expected_rest,
case(
&[0xEF, 0xBE],
Box::new(0xBEEF),
bits![Msb0, u8;]
),
)]
fn test_boxed(input: &[u8], expected: Box<u16>, expected_rest: &BitSlice<Msb0, u8>) {
let bit_slice = input.view_bits::<Msb0>();
let (rest, res_read) = <Box<u16>>::read(bit_slice, ()).unwrap();
assert_eq!(expected, res_read);
assert_eq!(expected_rest, rest);
let mut res_write = bitvec![Msb0, u8;];
res_read.write(&mut res_write, ()).unwrap();
assert_eq!(input.to_vec(), res_write.into_vec());
}
#[rstest(input, endian, bit_size, limit, expected, expected_rest, expected_write,
case::normal_le([0xAA, 0xBB, 0xCC, 0xDD].as_ref(), Endian::Little, Some(16), 2.into(), vec![0xBBAA, 0xDDCC].into_boxed_slice(), bits![Msb0, u8;], vec![0xAA, 0xBB, 0xCC, 0xDD]),
case::normal_be([0xAA, 0xBB, 0xCC, 0xDD].as_ref(), Endian::Big, Some(16), 2.into(), vec![0xAABB, 0xCCDD].into_boxed_slice(), bits![Msb0, u8;], vec![0xAA, 0xBB, 0xCC, 0xDD]),
case::predicate_le([0xAA, 0xBB, 0xCC, 0xDD].as_ref(), Endian::Little, Some(16), (|v: &u16| *v == 0xBBAA).into(), vec![0xBBAA].into_boxed_slice(), bits![Msb0, u8; 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 1, 1, 1, 0, 1], vec![0xAA, 0xBB]),
case::predicate_be([0xAA, 0xBB, 0xCC, 0xDD].as_ref(), Endian::Big, Some(16), (|v: &u16| *v == 0xAABB).into(), vec![0xAABB].into_boxed_slice(), bits![Msb0, u8; 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 1, 1, 1, 0, 1], vec![0xAA, 0xBB]),
case::bytes_le([0xAA, 0xBB, 0xCC, 0xDD].as_ref(), Endian::Little, Some(16), Size::Bits(16).into(), vec![0xBBAA].into_boxed_slice(), bits![Msb0, u8; 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 1, 1, 1, 0, 1], vec![0xAA, 0xBB]),
case::bytes_be([0xAA, 0xBB, 0xCC, 0xDD].as_ref(), Endian::Big, Some(16), Size::Bits(16).into(), vec![0xAABB].into_boxed_slice(), bits![Msb0, u8; 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 1, 1, 1, 0, 1], vec![0xAA, 0xBB]),
)]
fn test_boxed_slice<Predicate: FnMut(&u16) -> bool>(
input: &[u8],
endian: Endian,
bit_size: Option<usize>,
limit: Limit<u16, Predicate>,
expected: Box<[u16]>,
expected_rest: &BitSlice<Msb0, u8>,
expected_write: Vec<u8>,
) {
let bit_slice = input.view_bits::<Msb0>();
let bit_size = bit_size.unwrap();
let (rest, res_read) =
<Box<[u16]>>::read(bit_slice, (limit, (endian, Size::Bits(bit_size)))).unwrap();
assert_eq!(expected, res_read);
assert_eq!(expected_rest, rest);
let mut res_write = bitvec![Msb0, u8;];
res_read
.write(&mut res_write, (endian, Size::Bits(bit_size)))
.unwrap();
assert_eq!(expected_write, res_write.into_vec());
assert_eq!(input[..expected_write.len()].to_vec(), expected_write);
}
}