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use crate::{DekuError, DekuRead, DekuWrite};
use bitvec::prelude::*;
trait Append<T> {
type NewType;
fn append(self, new: T) -> Self::NewType;
}
impl<T> Append<T> for () {
type NewType = (T,);
fn append(self, new: T) -> Self::NewType {
(new,)
}
}
macro_rules! ImplDekuTupleTraits {
( $($T:ident,)+ ) => {
impl<$($T,)+ U> Append<U> for ($($T,)+) {
type NewType = ($($T,)+ U,);
#[allow(non_snake_case)]
fn append(self, new: U) -> Self::NewType {
let ($($T,)+) = self;
($($T,)+ new,)
}
}
impl<'a, Ctx: Copy, $($T:DekuRead<'a, Ctx>+Sized),+> DekuRead<'a, Ctx> for ($($T,)+)
{
fn read(
input: &'a BitSlice<Msb0, u8>,
ctx: Ctx,
) -> Result<(&'a BitSlice<Msb0, u8>, Self), DekuError>
where
Self: Sized,
{
let tuple = ();
let mut rest = input;
$(
let read = <$T>::read(rest, ctx)?;
rest = read.0;
let tuple = tuple.append(read.1);
)+
Ok((rest, tuple))
}
}
impl<Ctx: Copy, $($T:DekuWrite<Ctx>),+> DekuWrite<Ctx> for ($($T,)+)
{
#[allow(non_snake_case)]
fn write(&self, output: &mut BitVec<Msb0, u8>, ctx: Ctx) -> Result<(), DekuError> {
let ($(ref $T,)+) = *self;
$(
$T.write(output, ctx)?;
)+
Ok(())
}
}
};
}
ImplDekuTupleTraits! { A, }
ImplDekuTupleTraits! { A, B, }
ImplDekuTupleTraits! { A, B, C, }
ImplDekuTupleTraits! { A, B, C, D, }
ImplDekuTupleTraits! { A, B, C, D, E, }
ImplDekuTupleTraits! { A, B, C, D, E, F, }
ImplDekuTupleTraits! { A, B, C, D, E, F, G, }
ImplDekuTupleTraits! { A, B, C, D, E, F, G, H, }
ImplDekuTupleTraits! { A, B, C, D, E, F, G, H, I, }
ImplDekuTupleTraits! { A, B, C, D, E, F, G, H, I, J, }
ImplDekuTupleTraits! { A, B, C, D, E, F, G, H, I, J, K, }
#[cfg(test)]
mod tests {
use super::*;
use crate::native_endian;
use core::fmt::Debug;
use rstest::rstest;
#[rstest(input, expected, expected_rest,
case::length_1([0xef, 0xbe, 0xad, 0xde].as_ref(), (native_endian!(0xdeadbeef_u32),), bits![Msb0, u8;]),
case::length_2([1, 0x24, 0x98, 0x82, 0].as_ref(), (true, native_endian!(0x829824_u32)), bits![Msb0, u8;]),
case::length_11([0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10].as_ref(), (0u8, 1u8, 2u8, 3u8, 4u8, 5u8, 6u8, 7u8, 8u8, 9u8, 10u8), bits![Msb0, u8;]),
case::extra_rest([1, 0x24, 0x98, 0x82, 0, 0].as_ref(), (true, native_endian!(0x829824_u32)), bits![Msb0, u8; 0, 0, 0, 0, 0, 0, 0, 0]),
)]
fn test_tuple_read<'a, T>(input: &'a [u8], expected: T, expected_rest: &BitSlice<Msb0, u8>)
where
T: DekuRead<'a> + Sized + PartialEq + Debug,
{
let bit_slice = input.view_bits::<Msb0>();
let (rest, res_read) = <T>::read(bit_slice, ()).unwrap();
assert_eq!(expected, res_read);
assert_eq!(expected_rest, rest);
}
#[rstest(input, expected,
case::length_1((native_endian!(0xdeadbeef_u32),), vec![0xef, 0xbe, 0xad, 0xde]),
case::length_2((true, native_endian!(0x829824_u32)), vec![1, 0x24, 0x98, 0x82, 0]),
case::length_11((0u8, 1u8, 2u8, 3u8, 4u8, 5u8, 6u8, 7u8, 8u8, 9u8, 10u8), vec![0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10])
)]
fn test_tuple_write<T>(input: T, expected: Vec<u8>)
where
T: DekuWrite,
{
let mut res_write = bitvec![Msb0, u8;];
input.write(&mut res_write, ()).unwrap();
assert_eq!(expected, res_write.into_vec());
}
}