You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: encoding.rb
    path of file: ./repos/rdoc/lib/rdoc
    
    the code of the file until where you have to start completion: # coding: US-ASCII
# frozen_string_literal: true

##
# This class is a wrapper around File IO and Encoding that helps RDoc load
# files and convert them to the correct encoding.

module RDoc::Encoding

  HEADER_REGEXP = /^
    (?:
      \A\#!.*\n
      |
      ^\#\s+frozen[-_]string[-_]literal[=:].+\n
      |
      ^\#[^\n]+\b(?:en)?coding[=:]\s*(?<name>[^\s;
    
  def self.read_file filename, encoding, force_transcode = false
    content = File.open filename, "rb" do |f| f.read end
    content.gsub!("\r\n", "\n") if RUBY_PLATFORM =~ /mswin|mingw/

    utf8 = content.sub!(/\A\xef\xbb\xbf/, '')

    enc = RDoc::Encoding.detect_encoding content
    content = RDoc::Encoding.change_encoding content, enc if enc

    begin
      encoding ||= Encoding.default_external
      orig_encoding = content.encoding

      if not orig_encoding.ascii_compatible? then
        content = content.encode encoding
      elsif utf8 then
        content = RDoc::Encoding.change_encoding content, Encoding::UTF_8
        content = content.encode encoding
      else
        # assume the content is in our output encoding
        content = RDoc::Encoding.change_encoding content, encoding
      end

      unless content.valid_encoding? then
        # revert and try to transcode
        content = RDoc::Encoding.change_encoding content, orig_encoding
        content = content.encode encoding
      end