class WebSocket::Frame::Data

def <<(*args) 

def <<(*args)
  super(*convert_args(args))
end

def convert_args(args)

Convert all arguments to ASCII-8BIT for easier traversing 
def convert_args(args)
  args.collect { |arg| arg.dup.force_encoding('ASCII-8BIT') }
end

def getbytes(start_index, count)

Extract `count` bytes starting from `start_index` and unmask it if needed. 
def getbytes(start_index, count)
  data = self[start_index, count]
  data = mask(data.bytes.to_a, @masking_key).pack('C*') if @masking_key
  data
end

def initialize(*args) 

def initialize(*args)
  super(*convert_args(args))
  @masking_key = nil
end

def mask(payload, mask)

Mask whole payload using mask key 
def mask(payload, mask)
  return mask_native(payload, mask) if respond_to?(:mask_native)
  result = []
  payload.each_with_index do |byte, i|
    result[i] = byte ^ mask[i % 4]
  end
  result
end

def set_mask

Extract mask from 4 first bytes according to spec 
def set_mask
  raise WebSocket::Error::Frame::MaskTooShort if bytesize < 4
  @masking_key = self[0..3].bytes.to_a
end

def unset_mask

Remove mask flag - it will still be present in payload 
def unset_mask
  @masking_key = nil
end