38 lines
1013 B
Nim
38 lines
1013 B
Nim
import ./bitops2_priv, ./datatypes, ./uint_bitwise_ops
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import stew/endians2
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export endians2
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func swapBytes*(x: UintImpl): UintImpl {.inline.} =
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let lo = swapBytes(x.hi)
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let hi = swapBytes(x.lo)
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UintImpl(hi: hi, lo: lo)
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func copyMem(x: UintImpl): auto {.compileTime.} =
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const size = bitsof(x) div 8
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var ret: array[size, byte]
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type DT = type x.leastSignificantWord
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for i in 0 ..< size:
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let pos = i * 8
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ret[i] = byte((x shr pos).leastSignificantWord and 0xFF.DT)
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ret
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func toBytes*(x: UintImpl, endian: Endianness = system.cpuEndian): auto {.inline.} =
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# TODO can't use bitsof in return type (compiler bug?), hence return auto
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var ret: array[bitsof(x) div 8, byte]
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when nimvm:
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if endian == system.cpuEndian:
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ret = copyMem(x)
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else:
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let v = swapBytes(x)
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ret = copyMem(v)
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else:
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if endian == system.cpuEndian:
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copyMem(addr ret[0], unsafeAddr x, ret.len)
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else:
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let v = swapBytes(x)
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copyMem(addr ret[0], unsafeAddr v, ret.len)
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ret
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