29 lines
1.0 KiB
Nim
29 lines
1.0 KiB
Nim
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# Copyright (c) 2018 Status Research & Development GmbH
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# Distributed under the MIT License (license terms are at http://opensource.org/licenses/MIT).
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import typetraits
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import private/utils,
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uint_type
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proc initMpUint*[T: BaseUint; U: BaseUInt](n: T, base_type: typedesc[U]): MpUint[U] {.noSideEffect.} =
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let len = n.bit_length
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const sizeU_bits = sizeof(U) * 8
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when not (T is type result):
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if len >= 2 * sizeU_bits:
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# Todo print n
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raise newException(ValueError, "Input cannot be stored in a multi-precision integer of base " & $T.name &
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"\nIt requires at least " & $len & " bits of precision")
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elif len < sizeU_bits:
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result.lo = n.U # TODO: converter for MpInts
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else:
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raise newException(ValueError, "Unsupported at the moment: are you trying to build MpUint[uint32] from an uint64?")
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else:
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n
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proc u128*[T: BaseUInt](n: T): UInt128 {.noSideEffect, inline.}=
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initMpUint(n, uint64)
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proc u256*[T: BaseUInt](n: T): UInt256 {.noSideEffect, inline.}=
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initMpUint(n, UInt256)
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