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/usr/share/ettercap/lua/third-party/bin.lua is in ettercap-common 1:0.8.2-10build4.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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--- Binary data utilities

--- Turn a little-endian word into a number
local function le_to_number (s)
  local res = 0
  for i = #s, 1, -1 do
    res = res * 256 + string.byte (s, i)
  end
  return res
end

--- Turn a little-endian word into a hex string
local function le_to_hex (s)
  local res = ""
  for i = 1, #s do
    res = res .. string.format ("%.2x", string.byte (s, i))
  end
  return res
end

local M = {
  le_to_number = le_to_number,
  le_to_hex    = le_to_hex,
}

return M