module Nokogiri::HTML5

def read_and_encode(string, encoding)
  # Read the string with the given encoding.
  if string.respond_to?(:read)
    string = if encoding.nil?
      string.read
    else
      string.read(encoding: encoding)
    end
  else
    # Otherwise the string has the given encoding.
    string = string.to_s
    if encoding
      string = string.dup
      string.force_encoding(encoding)
    end
  end
  # convert to UTF-8
  if string.encoding != Encoding::UTF_8
    string = reencode(string)
  end
  string
end