39 lines
1.5 KiB
Nim
39 lines
1.5 KiB
Nim
# Fluffy
|
|
# Copyright (c) 2024 Status Research & Development GmbH
|
|
# Licensed and distributed under either of
|
|
# * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
|
|
# * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
|
|
# at your option. This file may not be copied, modified, or distributed except according to those terms.
|
|
|
|
import results, eth/common, ./state_content
|
|
|
|
export results, common
|
|
|
|
func decodePrefix*(nodePrefixRlp: Rlp): (byte, bool, Nibbles) =
|
|
doAssert(not nodePrefixRlp.isEmpty())
|
|
|
|
let
|
|
rlpBytes = nodePrefixRlp.toBytes()
|
|
firstNibble = (rlpBytes[0] and 0xF0) shr 4
|
|
isLeaf = firstNibble == 2 or firstNibble == 3
|
|
isEven = firstNibble == 0 or firstNibble == 2
|
|
startIdx = if isEven: 1 else: 0
|
|
nibbles = Nibbles.init(rlpBytes[startIdx .. ^1], isEven)
|
|
|
|
(firstNibble.byte, isLeaf, nibbles)
|
|
|
|
func rlpDecodeAccountTrieNode*(accountNode: TrieNode): Result[Account, string] =
|
|
let accNodeRlp = rlpFromBytes(accountNode.asSeq())
|
|
if accNodeRlp.isEmpty() or accNodeRlp.listLen() != 2:
|
|
return err("invalid account trie node - malformed")
|
|
|
|
let accNodePrefixRlp = accNodeRlp.listElem(0)
|
|
if accNodePrefixRlp.isEmpty():
|
|
return err("invalid account trie node - empty prefix")
|
|
|
|
let (_, isLeaf, _) = decodePrefix(accNodePrefixRlp)
|
|
if not isLeaf:
|
|
return err("invalid account trie node - leaf prefix expected")
|
|
|
|
decodeRlp(accNodeRlp.listElem(1).toBytes(), Account)
|