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A pure Elixir implementation of Google Protobuf.

Security advisory: This version has known vulnerabilities. View advisories
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protobuf lib protobuf wire zigzag.ex
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lib/protobuf/wire/zigzag.ex 

defmodule Protobuf.Wire.Zigzag do

  @moduledoc false



  import Bitwise



  @spec encode(integer) :: integer

  def encode(n) when n >= 0, do: n * 2

  def encode(n) when n < 0, do: n * -2 - 1



  @spec decode(integer) :: integer

  def decode(n) when band(n, 1) == 0, do: bsr(n, 1)

  def decode(n) when band(n, 1) == 1, do: -bsr(n + 1, 1)

end