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