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use core::convert::Infallible;
use core::hint::unreachable_unchecked;
use core::marker::PhantomData;
use bytecheck::CheckBytes;
use rkyv::rend::LittleEndian;
use rkyv::validation::validators::DefaultValidator;
use rkyv::{Archive, Deserialize, Fallible, Serialize};
#[cfg(feature = "host")]
mod host_store;
#[cfg(feature = "host")]
pub use host_store::HostStore;
mod store_ref;
pub use store_ref::*;
mod store_serializer;
pub use store_serializer::*;
mod token_buffer;
pub use token_buffer::*;
use crate::{
Annotation, ArchivedCompound, Branch, Compound, MaybeArchived, Walker,
};
#[derive(
Debug, Clone, Copy, Archive, Serialize, Deserialize, CheckBytes, Default,
)]
#[archive(as = "Self")]
pub struct OffsetLen(LittleEndian<u64>, LittleEndian<u16>);
impl OffsetLen {
pub fn new<O: Into<LittleEndian<u64>>, L: Into<LittleEndian<u16>>>(
offset: O,
len: L,
) -> OffsetLen {
OffsetLen(offset.into(), len.into())
}
pub fn inner(&self) -> u64 {
self.0.into()
}
pub fn offset(&self) -> u64 {
u64::from(self.0)
}
pub fn len(&self) -> u16 {
u16::from(self.1)
}
}
#[derive(CheckBytes)]
pub struct Ident<T, I> {
id: I,
_marker: PhantomData<T>,
}
impl<T, I> core::fmt::Debug for Ident<T, I>
where
I: core::fmt::Debug,
{
fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
f.debug_struct("Ident").field("id", &self.id).finish()
}
}
impl<T, I> Clone for Ident<T, I>
where
I: Clone,
{
fn clone(&self) -> Self {
Self {
id: self.id.clone(),
_marker: PhantomData,
}
}
}
impl<T, I> Copy for Ident<T, I> where I: Copy {}
impl<T, I> Ident<T, I> {
pub fn new(id: I) -> Self {
Ident {
id,
_marker: PhantomData,
}
}
pub fn erase(&self) -> &I {
&self.id
}
}
#[derive(Clone)]
pub struct Stored<T, I> {
store: StoreRef<I>,
ident: Ident<T, I>,
}
unsafe impl<T, I> Send for Stored<T, I> where I: Send {}
unsafe impl<T, I> Sync for Stored<T, I> where I: Sync {}
impl<T, I> Stored<T, I> {
pub fn new(store: StoreRef<I>, ident: Ident<T, I>) -> Self {
Stored { store, ident }
}
pub fn store(&self) -> &StoreRef<I> {
&self.store
}
pub fn ident(&self) -> &Ident<T, I> {
&self.ident
}
pub fn inner(&self) -> &T::Archived
where
T: Archive,
T::Archived: for<'a> CheckBytes<DefaultValidator<'a>>,
{
self.store.get(&self.ident)
}
pub fn walk<W, A>(&self, walker: W) -> Option<Branch<T, A, I>>
where
T: Compound<A, I>,
T::Archived: ArchivedCompound<T, A, I>
+ for<'any> CheckBytes<DefaultValidator<'any>>,
T::Leaf: 'static + Archive,
A: Annotation<T::Leaf>,
W: Walker<T, A, I>,
{
let inner = self.inner();
Branch::walk_with_store(
MaybeArchived::Archived(inner),
walker,
self.store().clone(),
)
}
}
pub trait StoreProvider<I>: Sized + Fallible {
fn store(&self) -> &StoreRef<I>;
}
pub trait Store {
type Identifier;
fn get(&self, ident: &Self::Identifier) -> &[u8];
fn request_buffer(&self) -> TokenBuffer;
fn persist(&self) -> Result<(), ()>;
fn commit(&self, buffer: &mut TokenBuffer) -> Self::Identifier;
fn extend(&self, buffer: &mut TokenBuffer) -> Result<(), ()>;
fn return_token(&self, token: Token);
}
pub trait UnwrapInfallible<T> {
fn unwrap_infallible(self) -> T;
}
impl<T> UnwrapInfallible<T> for Result<T, Infallible> {
fn unwrap_infallible(self) -> T {
match self {
Ok(t) => t,
Err(_) => unsafe {
unreachable_unchecked()
},
}
}
}