Struct reference_trie::ReferenceNodeCodecNoExt

pub struct ReferenceNodeCodecNoExt;

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 Clone for ReferenceNodeCodecNoExt

fn clone(&self) -> ReferenceNodeCodecNoExt

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Default for ReferenceNodeCodecNoExt

fn default() -> ReferenceNodeCodecNoExt

Returns the "default value" for a type.

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

type Error = CodecError

Codec error type.

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

Get the hashed null node.

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

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

fn try_decode_hash(data: &[u8]) -> Option<<H as Hasher>::Out>

Decode bytes to the Hashers output type. Returns None 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: &[u8]) -> 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<&[u8]>
) -> Vec<u8>

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

fn branch_node_nibbled(
    partial: impl Iterator<Item = u8>,
    number_nibble: usize,
    children: impl Iterator<Item = impl Borrow<Option<ChildReference<<H as Hasher>::Out>>>>,
    maybe_value: Option<&[u8]>
) -> Vec<u8>

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