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mratsim 2018-02-14 17:55:57 +01:00
parent d3df9f5055
commit 4ee4227eec
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12
src/private/casting.nim
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# Copyright (c) 2018 Status Research & Development GmbH
# Distributed under the MIT License (license terms are at http://opensource.org/licenses/MIT).
import ttmath, keccak_tiny, nimsha2
# We can't use Nim cast :/ to avoid copy
proc toUint256*[T: Hash[256]|array[32, byte|char]](hash: T): UInt256 =
copyMem(addr result, unsafeAddr hash, 32)
proc toByteArray*(num: UInt256): array[32, byte] =
copyMem(addr result, unsafeAddr num, 32)

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src/private/hex.nim
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# Copyright (c) 2018 Status Research & Development GmbH
# Distributed under the MIT License (license terms are at http://opensource.org/licenses/MIT).
import ttmath, strutils, ./casting
proc readHexChar(c: char): int =
case c
of '0'..'9': result = ord(c) - ord('0')
of 'a'..'f': result = ord(c) - ord('a') + 10
of 'A'..'F': result = ord(c) - ord('A') + 10
else:
raise newException(ValueError, $c & "is not a hexademical character")
proc hexToByteArray*[N: static[int]](hexStr: string): array[N, byte] {.noSideEffect.}=
var i = 0
if hexStr[i] == '0' and (hexStr[i+1] == 'x' or hexStr[i+1] == 'X'):
# Ignore 0x and OX
inc(i, 2)
assert hexStr.len - i == 2*N
while i < N:
result[i] = byte(readHexChar(hexStr[2*i]) shl 4 or readHexChar(hexStr[2*i+1]))
inc(i)
proc hexToUInt256*(hexStr: string): UInt256 {.noSideEffect.}=
const N = 32
var i = 0
if hexStr[i] == '0' and (hexStr[i+1] == 'x' or hexStr[i+1] == 'X'):
# Ignore 0x and OX
inc(i, 2)
assert hexStr.len - i == 2*N
while i < 2*N:
result = result shl 4 or readHexChar(hexStr[i]).uint.u256
inc(i)
proc toHex*(n: UInt256): string =
var rem = n # reminder to encode
const
N = 32 # nb of bytes in n
hexChars = "0123456789abcdef"
result = newString(2*N)
for i in countdown(2*N - 1, 0):
result[i] = hexChars[(rem and 0xF.u256).getUInt.int]
rem = rem shr 4