mirror of https://github.com/waku-org/nwaku.git
70 lines
1.6 KiB
Nim
70 lines
1.6 KiB
Nim
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when (NimMajor, NimMinor) < (1, 4):
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{.push raises: [Defect].}
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else:
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{.push raises: [].}
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type
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HexDataStr* = distinct string
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Identifier* = distinct string # 32 bytes, no 0x prefix!
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HexStrings* = HexDataStr | Identifier
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# Validation
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template hasHexHeader(value: string): bool =
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if value.len >= 2 and value[0] == '0' and value[1] in {'x', 'X'}: true
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else: false
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template isHexChar(c: char): bool =
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if c notin {'0'..'9'} and
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c notin {'a'..'f'} and
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c notin {'A'..'F'}: false
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else: true
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func isValidHexQuantity*(value: string): bool =
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if not hasHexHeader(value):
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return false
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# No leading zeros (but allow 0x0)
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if value.len < 3 or (value.len > 3 and value[2] == '0'):
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return false
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for i in 2..<value.len:
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let c = value[i]
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if not isHexChar(c):
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return false
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return true
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func isValidHexData*(value: string, header = true): bool =
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if header and not hasHexHeader(value):
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return false
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# Must be even number of digits
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if value.len mod 2 != 0:
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return false
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# Leading zeros are allowed
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for i in 2..<value.len:
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let c = value[i]
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if not isHexChar(c):
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return false
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return true
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template isValidHexData*(value: string, hexLen: int, header = true): bool =
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value.len == hexLen and value.isValidHexData(header)
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proc validateHexData*(value: string) {.inline, raises: [ValueError].} =
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if unlikely(not isValidHexData(value)):
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raise newException(ValueError, "Invalid hex data format: " & value)
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# Initialisation
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proc hexDataStr*(value: string): HexDataStr {.inline, raises: [ValueError].} =
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validateHexData(value)
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HexDataStr(value)
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