class BinData::IO::Read

def initialize(io)
  raise ArgumentError, "io must not be a BinData::IO::Read" if BinData::IO::Read === io
  # wrap strings in a StringIO
  if io.respond_to?(:to_str)
    io = BinData::IO.create_string_io(io.to_str)
  end
  @raw_io = io
  # bits when reading
  @rnbits  = 0
  @rval    = 0
  @rendian = nil
  @buffer_end_pos = nil
  extend seekable? ? SeekableStream : UnSeekableStream
end