Class: AmpkWriter

Inherits:
Object
  • Object
show all
Defined in:
lib/ampk/writer.rb

Instance Method Summary collapse

Constructor Details

#initialize(path, private_key, &block) ⇒ AmpkWriter

Returns a new instance of AmpkWriter.



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# File 'lib/ampk/writer.rb', line 4

def initialize(path, private_key, &block)
	@fp = File.open(path,'wb')
	write("AMPK")
	@private_key = private_key
	if block_given?
		begin
			yield(self)
		ensure
			close()
		end
	end
end

Instance Method Details

#add_entity(name, data, options = {}) ⇒ Object 



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# File 'lib/ampk/writer.rb', line 16

def add_entity(name, data, options = {})
	write_entry("NAME", name)
	write_entry("DLEN", size(data).to_s)
	
	if data.respond_to?(:encoding)
		write_entry("ENCD", data.encoding.name)
		data = data.force_encoding("ASCII-8BIT")
	end
	
	write_entry("TYPE", options[:type] || 'application/octet-stream')
	if options[:sign] || options[:signature]
		write_entry("SIGN", options[:signature] || @private_key.sign(data))
	end
	filter = ""
	if options[:encrypt] || options[:crypt]
		filter << "C"
		data = @private_key.encrypt(data)
	end
	orig_size = size(data)
	if options[:compress] and size(data) > 256
		filter << "Z"
		data = Zlib::Deflate.deflate(data)
	end
	unless filter.empty?
		write_entry('FILT', filter)
	end
	write_size = size(data)
	write_entry("DATA", data)
end

#close ⇒ Object 



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# File 'lib/ampk/writer.rb', line 46

def close
	write('ENDS')
	@fp.close()
end