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#![warn(missing_docs)]
#![cfg_attr(not(feature = "std"), no_std)]
extern crate alloc;
#[cfg(feature = "serde")]
use serde::{Serialize, Deserialize};
use typenum::U32;
use generic_array::GenericArray;
use primitive_types::H256;
use digest::Digest;
pub use bm::{Backend, ReadBackend, WriteBackend, InheritedDigestConstruct,
UnitDigestConstruct, Construct, InheritedEmpty, Error, Vector,
DanglingVector, List, Leak, NoopBackend, InMemoryBackend};
mod basic;
mod elemental_fixed;
mod elemental_variable;
mod fixed;
mod variable;
pub mod utils;
pub use elemental_fixed::{ElementalFixedVec, ElementalFixedVecRef,
IntoCompactVectorTree, FromCompactVectorTree,
IntoCompositeVectorTree, FromCompositeVectorTree};
pub use elemental_variable::{ElementalVariableVec, ElementalVariableVecRef,
IntoCompactListTree, FromCompactListTree,
IntoCompositeListTree, FromCompositeListTree};
pub use variable::MaxVec;
#[cfg(feature = "derive")]
pub use bm_le_derive::{FromTree, IntoTree};
pub type DigestConstruct<D> = bm::InheritedDigestConstruct<D, Value>;
#[derive(Debug, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
#[cfg_attr(feature = "parity-codec", derive(parity_codec::Encode, parity_codec::Decode))]
pub struct Value(pub H256);
impl Default for Value {
fn default() -> Self {
Self(H256::default())
}
}
impl AsRef<[u8]> for Value {
fn as_ref(&self) -> &[u8] {
self.0.as_ref()
}
}
impl AsMut<[u8]> for Value {
fn as_mut(&mut self) -> &mut [u8] {
self.0.as_mut()
}
}
impl From<usize> for Value {
fn from(value: usize) -> Self {
let mut ret = [0u8; 32];
let bytes = (value as u64).to_le_bytes();
(&mut ret[0..8]).copy_from_slice(&bytes);
Value(H256::from(ret))
}
}
impl Into<usize> for Value {
fn into(self) -> usize {
let mut raw = [0u8; 8];
(&mut raw).copy_from_slice(&self.0[0..8]);
u64::from_le_bytes(raw) as usize
}
}
impl From<GenericArray<u8, typenum::U32>> for Value {
fn from(array: GenericArray<u8, typenum::U32>) -> Self {
Self(H256::from_slice(array.as_slice()))
}
}
pub type Intermediate = H256;
pub trait CompatibleConstruct: Construct<Value=Value> { }
impl<C: Construct<Value=Value>> CompatibleConstruct for C { }
pub trait IntoTree {
fn into_tree<DB: WriteBackend>(
&self,
db: &mut DB
) -> Result<<DB::Construct as Construct>::Value, Error<DB::Error>> where
DB::Construct: CompatibleConstruct;
}
pub trait FromTree: Sized {
fn from_tree<DB: ReadBackend>(
root: &<DB::Construct as Construct>::Value,
db: &mut DB
) -> Result<Self, Error<DB::Error>> where
DB::Construct: CompatibleConstruct;
}
#[derive(Debug, Eq, PartialEq)]
pub struct CompactRef<'a, T>(pub &'a T);
#[derive(Debug, Clone, Eq, PartialEq)]
#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
#[cfg_attr(feature = "serde", serde(transparent))]
pub struct Compact<T>(pub T);
impl<T> From<T> for Compact<T> {
fn from(t: T) -> Self {
Self(t)
}
}
pub fn tree_root<D, T>(value: &T) -> H256 where
T: IntoTree,
D: Digest<OutputSize=U32>,
{
value.into_tree(&mut NoopBackend::<DigestConstruct<D>>::default())
.map(|ret| H256::from_slice(ret.as_ref()))
.expect("Noop backend never fails in set; qed")
}