add a list chunk function

git-svn-id: file:///home/svn/framework3/trunk@9997 4d416f70-5f16-0410-b530-b9f4589650da

lib/msf/core/exploit/riff.rb

@@ -22,6 +22,17 @@ module Exploit::RIFF
 
 		return tag + [len].pack('V') + data + ("\x00" * padding)
 	end
+	
+	#
+	# Builds a RIFF list chunk (one containing other chunks)
+	#
+	def riff_list_chunk(tag, type, data)
+
+		len = data.length + 4
+		padding = len % 2
+
+		return tag + [len].pack('V') + type + data
+	end
 
 	#
 	# Generates a random number of random RIFF chunks, up to 4352 bytes