Directory Utilitys<code lang="Ruby">

class Dir
	def Dir.escape(path)
		path_new = []
		path.unpack("C*").map{ |n|
			# meta char
			if( %q{"$&'()*/;<>?[\\`|}.include?(n) )
				path_new.push(0x5C)
                                path_new.push(n)
			else
				path_new.push(n)
			end
		}
		path_new.pack("C*")
	end
	# get ext
	def Dir.getExt( fullpath )
		len = fullpath.rindex('.')
		return "." if len==nil
		fullpath[ len , fullpath.length-len ]
	end
	# change ext
	def Dir.subExt( filename , newext )
		return if filename.rindex('.')==nil
		newext = ('.'+newext) if newext[0]!='.'
		filename.sub!( /\..+/,newext )
	end
end

</code>