# File lib/net/ssh/authentication/pageant.rb, line 168
168:       def read(n = nil)
169:         return nil unless @res
170:         if n.nil?
171:           start, @pos = @pos, @res.size
172:           return @res[start..-1]
173:         else
174:           start, @pos = @pos, @pos + n
175:           return @res[start, n]
176:         end
177:       end