module Cucumber::Messages::Varint

def self.encode_varint(io, int_val)
  if int_val < 0
    # negative varints are always encoded with the full 10 bytes
    int_val = int_val & 0xffffffff_ffffffff
  end
  loop do
    byte = int_val & 0x7f
    int_val >>= 7
    if int_val == 0
      io << byte.chr
      break
    else
      io << (byte | 0x80).chr
    end
  end
end