pstoid.rb

def int_to_pstoid(int)
	int = int.to_i
	result = ""
	while int > 0
		result.prepend(((int % 27) + 'a'.ord - 1).chr)
		int = int / 27
	end
	result
	end
	
	def pstoid_to_int(postid)
		result = 0
		chars = postid.chars.to_a.reverse
		chars.each_index do |i|
			result += (chars[i].ord - 'a'.ord + 1) * (27 ** i)
		end
		result
	end