byteutils: compile-time to/fromBytes (#35)
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@ -145,11 +145,21 @@ func toBytes*(s: string): seq[byte] =
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## Convert a string to the corresponding byte sequence - since strings in
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## Convert a string to the corresponding byte sequence - since strings in
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## nim essentially are byte sequences without any particular encoding, this
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## nim essentially are byte sequences without any particular encoding, this
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## simply copies the bytes without a null terminator
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## simply copies the bytes without a null terminator
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when nimvm:
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var r = newSeq[byte](s.len)
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for i, c in s:
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r[i] = cast[byte](c)
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r
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else:
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@(s.toOpenArrayByte(0, s.high))
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@(s.toOpenArrayByte(0, s.high))
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func fromBytes*(T: type string, v: openArray[byte]): string =
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func fromBytes*(T: type string, v: openArray[byte]): string =
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if v.len > 0:
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if v.len > 0:
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result = newString(v.len)
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result = newString(v.len)
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when nimvm:
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for i, c in v:
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result[i] = cast[char](c)
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else:
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copyMem(addr result[0], unsafeAddr v[0], v.len)
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copyMem(addr result[0], unsafeAddr v[0], v.len)
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func `<`*(a, b: openArray[byte]): bool =
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func `<`*(a, b: openArray[byte]): bool =
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@ -99,7 +99,8 @@ suite "Byte utils":
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"".toBytes().len() == 0
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"".toBytes().len() == 0
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string.fromBytes([]) == ""
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string.fromBytes([]) == ""
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@[byte(ord('a'))] == static("a".toBytes())
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"a" == static(string.fromBytes([byte(ord('a'))]))
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test "slices":
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test "slices":
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var a: array[4, byte]
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var a: array[4, byte]
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a[0..<2] = [2'u8, 3]
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a[0..<2] = [2'u8, 3]
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