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: pe.rb
    path of file: ./repos/grinder/node/lib/metasm/metasm/exe_format
    
    the code of the file until where you have to start completion: #    This file is part of Metasm, the Ruby assembly manipulation suite
#    Copyright (C) 2006-2009 Yoann GUILLOT
#
#    Licence is LGPL, see LICENCE in the top-level directory


require 'metasm/exe_format/main'
require 'metasm/exe_format/mz'
require 'metasm/exe_format/coff'

module Metasm
class PE < COFF
	MAGIC = "PE\0\0"	# 0x50450000

	attr_accessor :coff_offset, :signature, :mz

	def initialize(*a)
		super(*a)
		cpu = a.grep(CPU).first
		@mz = MZ.new(cpu).share_namespace(self)
	end

	# overrides COFF#decode_header
	# simply sets the offset to the PE pointer before decoding the COFF header
	# also checks the PE signature
	def decode_header
		@cursection ||= self
		@encoded.ptr = 0x3c
		@encoded.ptr = decode_word(@encoded)
		@signature = @encoded.read(4)
		raise InvalidExeFormat, "Invalid PE signature #{@signature.inspect}" if @signature != MAGIC
		@coff_offset = @encode
    
	def init_disassembler
		d = super()
		d.backtrace_maxblocks_data = 4
		case @cpu.shortname
		when 'ia32', 'x64'
			old_cp = d.c_parser
			d.c_parser = nil
			d.parse_c '__stdcall void *GetProcAddress(int, char *);'
			d.parse_c '__stdcall void ExitProcess(int) __attribute__((noreturn));'
			d.c_parser.lexer.define_weak('__MS_X86_64_ABI__') if @cpu.shortname == 'x64'
			gpa = @cpu.decode_c_function_prototype(d.c_parser, 'GetProcAddress')
			epr = @cpu.decode_c_function_prototype(d.c_parser, 'ExitProcess')
			d.c_parser = old_cp
			d.parse_c ''
			d.c_parser.lexer.define_weak('__MS_X86_64_ABI__') if @cpu.shortname == 'x64'
			@getprocaddr_unknown = []
			gpa.btbind_callback = lambda { |dasm, bind, funcaddr, calladdr, expr, origin, maxdepth|
				break bind if @getprocaddr_unknown.include? [dasm, calladdr] or not Expression[expr].externals.include? :eax
				sz = @cpu.size/8
				break bind if not dasm.decoded[calladdr]
				if @cpu.shortname == 'x64'
					arg2 = :rdx
				else
					arg2 = Indirection[[:esp, :+, 2*sz], sz, calladdr]
				end