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1774 :: Canonical way to handle binary data

• zielmicha (orginal) [2015-11-07T22:13:39+01:00] view original

  Let's say I have an integer encoded as a big-endian 32 bit unsigned value. In Python I would extract it using struct module:

  Run

  What is the best way to do this in Nim?

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• OderWat (orginal) [2015-11-08T00:55:00+01:00] view original

  There is http://nim-lang.org/docs/endians.html

  import endians
  
  let b = "\xff\x0\x0\x0"
  var a: uint32
  swapEndian32(addr(a), unsafeAddr(b[0]))
  echo a
  
  let c: uint32 = 0xff000000u32
  swapEndian32(addr(a), unsafeAddr(c))
  echo a
  Run

  I use unsafeAddr() here but with vars you can use addr().

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