Add function to generate a range of IP addresses as an array

README.md

@@ -62,6 +62,11 @@ ip.cidrSubnet('192.168.1.134/26').contains('192.168.1.190') // true
 // ipv4 long conversion
 ip.toLong('127.0.0.1'); // 2130706433
 ip.fromLong(2130706433); // '127.0.0.1'
+
+
+// ipv4 range generation
+ip.range('192.168.0.1','192.168.0.4);  // start IP address, end IP address
+// [ '192.168.0.1', '192.168.0.2', '192.168.0.3', '192.168.0.4' ]
 ```
 
 ### License

lib/ip.js

@@ -410,3 +410,19 @@ ip.fromLong = function(ipl) {
       (ipl >> 8 & 255) + '.' +
       (ipl & 255) );
 };
+
+ip.range = function(start_ip, end_ip) {
+  var start_long = ip.toLong(start_ip);
+  var end_long = ip.toLong(end_ip);
+  if (start_long > end_long) {
+    var tmp = start_long;
+    start_long = end_long;
+    end_long = tmp;
+  }
+  var range_array = [];
+  var i;
+  for (i = start_long; i <= end_long; i++) {
+    range_array.push(ip.fromLong(i));
+  }
+  return range_array;
+};

test/api-test.js

@@ -399,4 +399,15 @@ describe('IP library for node.js', function() {
       assert.equal(ip.fromLong(4294967295), '255.255.255.255');
     });
   })
+
+  describe('range() method', function() {
+    it('should repond with array of ipv4 addresses', function() {
+      var range_array = ip.range('192.168.0.0', '192.168.1.255');
+      assert.equal(range_array.length, 512);
+      assert.equal(range_array[0], '192.168.0.0');
+      assert.equal(range_array[1], '192.168.0.1');
+      assert.equal(range_array[510], '192.168.1.254');
+      assert.equal(range_array[511], '192.168.1.255');
+    });
+  })
 });