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