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nimbus-eth1
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hex prefix encoding minor optimization

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andri lim 2020-04-22 11:43:37 +07:00
parent 2b00c1923a
commit 9cebceaf8e
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GPG Key ID: 31702AE10541E6B9
1 changed files with 11 additions and 7 deletions
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18
stateless/tree_from_witness.nim
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@ -112,24 +112,28 @@ proc branchNode(t: var TreeBuilder, depth: int, has16Elem: bool): KeccakHash =
result = keccak(r.finish)
func hexPrefix(x: openArray[byte], nibblesLen: int): seq[byte] =
result = newSeqOfCap[byte]((nibblesLen div 2) + 1)
func hexPrefix(r: var RlpWriter, x: openArray[byte], nibblesLen: int) =
var bytes: array[33, byte]
if (nibblesLen mod 2) == 0:
result.add 0.byte
bytes[0] = 0.byte
var i = 1
for y in x:
result.add y
bytes[i] = y
inc i
else:
result.add(0b0001_0000.byte or (x[0] shr 4))
bytes[0] = 0b0001_0000.byte or (x[0] shr 4)
var last = nibblesLen div 2
for i in 1..last:
result.add((x[i-1] shl 4) or (x[i] shr 4))
bytes[i] = (x[i-1] shl 4) or (x[i] shr 4)
r.append toOpenArray(bytes, 0, nibblesLen div 2)
proc extensionNode(t: var TreeBuilder, depth: int): KeccakHash =
assert(depth < 63)
let nibblesLen = int(t.readByte)
assert(nibblesLen < 65)
var r = initRlpList(2)
r.append hexPrefix(t.read(nibblesLen div 2 + nibblesLen mod 2), nibblesLen)
r.hexPrefix(t.read(nibblesLen div 2 + nibblesLen mod 2), nibblesLen)
assert(depth + nibblesLen < 65)
let nodeType = TrieNodeType(t.readByte)