Struct reference_trie::ReferenceNodeCodecNoExt

pub struct ReferenceNodeCodecNoExt<H>(_);

Simple reference implementation of a NodeCodec. Even if implementation follows initial specification of https://github.com/w3f/polkadot-re-spec/issues/8, this may not follow it in the future, it is mainly the testing codec without extension node.

Trait Implementations

impl<H: Clone> Clone for ReferenceNodeCodecNoExt<H>

fn clone(&self) -> ReferenceNodeCodecNoExt<H>

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<H: Default> Default for ReferenceNodeCodecNoExt<H>

fn default() -> ReferenceNodeCodecNoExt<H>

Returns the “default value” for a type.

impl<H: Hasher> NodeCodec for ReferenceNodeCodecNoExt<H>

type Error = CodecError

Codec error type.

type HashOut = <H as Hasher>::Out

Output type of encoded node hasher.

fn hashed_null_node() -> <H as Hasher>::Out

Get the hashed null node.

fn decode_plan(data: &[u8]) -> Result<NodePlan, Self::Error>

Decode bytes to a NodePlan. Returns Self::E on failure.

fn is_empty_node(data: &[u8]) -> bool

Check if the provided bytes correspond to the codecs “empty” node.

fn empty_node() -> &'static [u8]

Returns an encoded empty node.

fn leaf_node(partial: Partial<'_>, value: Value<'_>) -> Vec<u8>

Returns an encoded leaf node

fn extension_node(
    _partial: impl Iterator<Item = u8>,
    _nbnibble: usize,
    _child: ChildReference<<H as Hasher>::Out>
) -> Vec<u8>

Returns an encoded extension node Note that number_nibble is the number of element of the iterator it can possibly be obtain by Iterator size_hint, but for simplicity it is used directly as a parameter.

fn branch_node(
    _children: impl Iterator<Item = impl Borrow<Option<ChildReference<<H as Hasher>::Out>>>>,
    _maybe_value: Option<Value<'_>>
) -> Vec<u8>

Returns an encoded branch node. Takes an iterator yielding ChildReference<Self::HashOut> and an optional value.

fn branch_node_nibbled(
    partial: impl Iterator<Item = u8>,
    number_nibble: usize,
    children: impl Iterator<Item = impl Borrow<Option<ChildReference<Self::HashOut>>>>,
    maybe_value: Option<Value<'_>>
) -> Vec<u8>

Returns an encoded branch node with a possible partial path. number_nibble is the partial path length as in extension_node.

const ESCAPE_HEADER: Option<u8>

Escape header byte sequence to indicate next node is a branch or leaf with hash of value, followed by the value node.

fn decode(data: &'a [u8]) -> Result<Node<'a>, Self::Error>

Decode bytes to a Node. Returns Self::E on failure.