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use crate::{DekuError, DekuRead, DekuWrite}; use bitvec::prelude::*; impl<'a, T: DekuRead<'a, Ctx>, Ctx: Copy> DekuRead<'a, Ctx> for Option<T> { /// Read a T from input and store as Some(T) /// * `inner_ctx` - The context required by `T`. It will be passed to every `T`s when constructing. /// # Examples /// ```rust /// # use deku::ctx::*; /// # use deku::DekuRead; /// # use deku::bitvec::BitView; /// let input = vec![1u8, 2, 3, 4]; /// let (rest, v) = Option::<u32>::read(input.view_bits(), Endian::Little).unwrap(); /// assert!(rest.is_empty()); /// assert_eq!(v, Some(0x04030201)) /// ``` 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, Some(val))) } } impl<T: DekuWrite<Ctx>, Ctx: Copy> DekuWrite<Ctx> for Option<T> { /// Write T if Some /// * **inner_ctx** - The context required by `T`. /// # Examples /// ```rust /// # use deku::{ctx::Endian, DekuWrite}; /// # use deku::bitvec::{bitvec, Msb0}; /// let data = Some(1u8); /// let mut output = bitvec![Msb0, u8;]; /// data.write(&mut output, Endian::Big).unwrap(); /// assert_eq!(output, bitvec![Msb0, u8; 0, 0, 0, 0, 0, 0, 0, 1]) /// ``` fn write(&self, output: &mut BitVec<Msb0, u8>, inner_ctx: Ctx) -> Result<(), DekuError> { self.as_ref().map_or(Ok(()), |v| v.write(output, inner_ctx)) } }