2018-04-25 19:21:25 +00:00
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# Stint
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2018-03-26 09:46:24 +00:00
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# Copyright 2018 Status Research & Development GmbH
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# Licensed under either of
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#
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# * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
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# * MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
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#
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# at your option. This file may not be copied, modified, or distributed except according to those terms.
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2018-04-25 12:43:24 +00:00
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import ./datatypes
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2018-03-28 15:15:36 +00:00
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2018-04-21 10:12:05 +00:00
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func toSubtype*[T: SomeInteger](b: bool, _: typedesc[T]): T {.inline.}=
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2018-03-26 10:45:10 +00:00
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b.T
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2018-04-25 10:52:00 +00:00
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func toSubtype*[T: UintImpl](b: bool, _: typedesc[T]): T {.inline.}=
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2018-03-26 10:45:10 +00:00
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type SubTy = type result.lo
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result.lo = toSubtype(b, SubTy)
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2018-03-26 09:46:24 +00:00
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2018-04-25 10:52:00 +00:00
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func toUint*(n: UintImpl): auto {.inline.}=
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2018-03-26 09:46:24 +00:00
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## Casts a multiprecision integer to an uint of the same size
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# TODO: uint128 support
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when n.sizeof > 8:
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2018-04-25 10:52:00 +00:00
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raise newException("Unreachable. You are trying to cast a StUint with more than 64-bit of precision")
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2018-03-26 09:46:24 +00:00
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elif n.sizeof == 8:
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cast[uint64](n)
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elif n.sizeof == 4:
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cast[uint32](n)
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elif n.sizeof == 2:
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cast[uint16](n)
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else:
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raise newException("Unreachable. StUint must be 16-bit minimum and a power of 2")
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2018-03-26 09:46:24 +00:00
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2018-04-21 10:12:05 +00:00
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func toUint*(n: SomeUnsignedInt): SomeUnsignedInt {.inline.}=
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2018-03-26 09:46:24 +00:00
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## No-op overload of multi-precision int casting
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n
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2018-04-21 10:12:05 +00:00
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func asDoubleUint*(n: BaseUint): auto {.inline.} =
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## Convert an integer or StUint to an uint with double the size
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type Double = (
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when n.sizeof == 4: uint64
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elif n.sizeof == 2: uint32
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else: uint16
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)
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n.toUint.Double
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2018-04-25 10:52:00 +00:00
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func toUintImpl*(n: uint16|uint32|uint64): auto {.inline.} =
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## Cast an integer to the corresponding size UintImpl
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2018-03-26 09:46:24 +00:00
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# Sometimes direct casting doesn't work and we must cast through a pointer
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when n is uint64:
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return (cast[ptr [UintImpl[uint32]]](unsafeAddr n))[]
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elif n is uint32:
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return (cast[ptr [UintImpl[uint16]]](unsafeAddr n))[]
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elif n is uint16:
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return (cast[ptr [UintImpl[uint8]]](unsafeAddr n))[]
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2018-03-28 18:45:39 +00:00
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2018-04-25 10:52:00 +00:00
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func toUintImpl*(n: UintImpl): UintImpl {.inline.} =
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## No op
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n
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