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use zerocopy::{FromBytes, Immutable, KnownLayout, Ref};
pub trait Reader {
fn read_at<T>(&self, offset: u64) -> Option<&T>
where
T: FromBytes + KnownLayout + Immutable;
fn read_slice_at<T>(&self, offset: u64, len: usize) -> Option<&[T]>
where
T: FromBytes + KnownLayout + Immutable;
}
impl Reader for [u8] {
fn read_at<T>(&self, offset: u64) -> Option<&T>
where
T: FromBytes + KnownLayout + Immutable,
{
let offset: usize = offset.try_into().ok()?;
let end: usize = offset.checked_add(core::mem::size_of::<T>())?;
let lv = Ref::<&[u8], T>::from_bytes(self.get(offset..end)?).ok()?;
Some(Ref::into_ref(lv))
}
fn read_slice_at<T>(&self, offset: u64, len: usize) -> Option<&[T]>
where
T: FromBytes + KnownLayout + Immutable,
{
let offset: usize = offset.try_into().ok()?;
let end: usize = offset.checked_add(core::mem::size_of::<T>().checked_mul(len)?)?;
let lv = Ref::<&[u8], [T]>::from_bytes(self.get(offset..end)?).ok()?;
Some(Ref::into_ref(lv))
}
}