local hex = {}

function hex.dump(buf)
  for byte=1, #buf, 16 do
    local chunk = buf:sub(byte, byte+15)
    io.write(string.format('%08X  ',byte-1))
    chunk:gsub('.', function (c) io.write(string.format('%02X ',string.byte(c))) end)
    io.write(string.rep(' ',3*(16-#chunk)))
    io.write(' ',chunk:gsub('%c','.'),"\n")
  end
end

return hex