added #to range and fixed ipaddress-gem#40

lib/ipaddress/ipv4.rb

@@ -640,6 +640,26 @@ def reverse
     end
     alias_method :arpa, :reverse
 
+    #
+    # Return a list of IP's between @address
+    # and the supplied IP
+    #
+    #   ip = IPAddress("172.16.100.51/32")
+    #
+    #   ip.to("172.16.100.100")
+    #     #=> ["172.16.100.51",
+    #          "172.16.100.52",
+    #          ...
+    #          "172.16.100.99",
+    #          "172.16.100.100"]
+    #
+    def to(e)
+      unless e.is_a? IPAddress::IPv4
+        e = IPv4.new(e)
+      end
+
+      Range.new(@u32, e.to_u32).map{|i| IPAddress.ntoa(i) }
+    end
     #
     # Splits a network into different subnets
     #
@@ -1028,7 +1048,7 @@ def self.parse_classful(ip)
 
     # Tweaked to remove the #upto(32)
     def newprefix(num)
-      return @prefix + (Math::log2(num).to_i)
+      return @prefix + (Math::log2(num).ceil )
     end
 
     def sum_first_found(arr)

test/ipaddress/ipv4_test.rb

@@ -64,6 +64,11 @@ def setup
       "10.1.1.1"  => 8,
       "150.1.1.1" => 16,
       "200.1.1.1" => 24 }
+
+    @in_range = {
+      "10.32.0.1" => ["10.32.0.253", 253],
+      "192.0.0.0" => ["192.1.255.255", 131072]
+    }
 
   end
 
@@ -551,6 +556,14 @@ def test_network_split
       assert_equal x.split(256).length, 256
     end
   end
+
+  def test_in_range
+    @in_range.each do |s,d|
+      ip = @klass.new(s)
+      assert_equal ip.to(d[0]).length, d[1]  
+    end
+  end
+
 end # class IPv4Test