class Faye::WebSocket::HybiParser

def frame(data, type = nil, code = nil)
  return nil if @closed
  is_text = (String === data)
  opcode  = OPCODES[type || (is_text ? :text : :binary)]
  buffer  = data.respond_to?(:bytes) ? data.bytes.to_a : data
  insert  = code ? 2 : 0
  length  = buffer.size + insert
  header  = (length <= 125) ? 2 : (length <= 65535 ? 4 : 10)
  offset  = header + (@masking ? 4 : 0)
  masked  = @masking ? MASK : 0
  frame   = Array.new(offset)
  frame[0] = FIN | opcode
  if length <= 125
    frame[1] = masked | length
  elsif length <= 65535
    frame[1] = masked | 126
    frame[2] = (length >> 8) & BYTE
    frame[3] = length & BYTE
  else
    frame[1] = masked | 127
    frame[2] = (length >> 56) & BYTE
    frame[3] = (length >> 48) & BYTE
    frame[4] = (length >> 40) & BYTE
    frame[5] = (length >> 32) & BYTE
    frame[6] = (length >> 24) & BYTE
    frame[7] = (length >> 16) & BYTE
    frame[8] = (length >> 8)  & BYTE
    frame[9] = length & BYTE
  end
  if code
    buffer = [(code >> 8) & BYTE, code & BYTE] + buffer
  end
  if @masking
    mask = [rand(256), rand(256), rand(256), rand(256)]
    frame[header...offset] = mask
    buffer = Mask.mask(buffer, mask)
  end
  frame.concat(buffer)
  WebSocket.encode(frame)
end