57 lines
1.3 KiB
Nim
57 lines
1.3 KiB
Nim
import nimcrypto/hash, stew/bitops2
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type
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TrieNodeType* = enum
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BranchNodeType
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ExtensionNodeType
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AccountNodeType
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HashNodeType
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AccountType* = enum
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SimpleAccountType
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ExtendedAccountType
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BytecodeType* = enum
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CodeTouched
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CodeUntouched
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WitnessFlag* = enum
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wfNoFlag
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wfEIP170 # fork >= Spurious Dragon
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MetadataType* = enum
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MetadataNothing
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MetadataSomething
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WitnessFlags* = set[WitnessFlag]
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ContractCodeError* = object of ValueError
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ParsingError* = object of ValueError
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StorageSlot* = array[32, byte]
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const
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StorageLeafNodeType* = AccountNodeType
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BlockWitnessVersion* = 0x01
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ShortRlpPrefix* = 0.byte
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proc setBranchMaskBit*(x: var uint, i: int) {.inline.} =
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assert(i >= 0 and i < 17)
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x = x or (1 shl i).uint
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func branchMaskBitIsSet*(x: uint, i: int): bool {.inline.} =
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assert(i >= 0 and i < 17)
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result = ((x shr i.uint) and 1'u) == 1'u
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func constructBranchMask*(b1, b2: byte): uint {.inline.} =
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result = uint(b1) shl 8 or uint(b2)
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if countOnes(result) < 2 or ((result and (not 0x1FFFF'u)) != 0):
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raise newException(ParsingError, "Invalid branch mask pattern " & $result)
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iterator nonEmpty*(branchMask: uint): int =
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for i in 0..<16:
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if not branchMask.branchMaskBitIsSet(i):
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# we skip an empty elem
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continue
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yield i
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