Replace the core of the text generation methods; previously, these could result in an oddball string result that would not auto-convert into ASCII-8BIT. Looks like a strange corner case in Ruby 1.9

git-svn-id: file:///home/svn/framework3/trunk@9254 4d416f70-5f16-0410-b530-b9f4589650da

lib/rex/text.rb

@@ -626,22 +626,11 @@ module Text
 
 	# Base text generator method
 	def self.rand_base(len, bad, *foo)
-		# Remove restricted characters
-		(bad || '').split('').each { |c| foo.delete(c) }
-
-		# Return nil if all bytes are restricted
-		return nil if foo.length == 0
-
-		buff = ""
-
-		# Generate a buffer from the remaining bytes
-		if foo.length >= 256
-			len.times { buff << Kernel.rand(256) }
-		else
-			len.times { buff << foo[ rand(foo.length) ] }
-		end
-
-		return buff
+		cset = (foo.join.unpack("C*") - bad.to_s.unpack("C*")).uniq
+		return if cset.length == 0
+		outp = []
+		len.times { outp << cset[rand(cset.length)] }
+		outp.pack("C*")
 	end
 
 	# Generate random bytes of data