Added parsing of IPv4-mapped IPv6 addresses

lib/IPAddress.js

@@ -18,3 +18,11 @@ exports.parseIPv6 = function parseIPv6(ip) {
     }
     return v6Address.parsedAddress;
 };
+
+exports.parseIPv4MappedIPv6 = function parseIPv4MappedIPv6(ip){
+    var v6Address = new IPv6.Address(ip);
+    if (!v6Address.isValid() || !v6Address.is4()){
+        throw new Error("Invalid IPv4-mapped IPv6 address");
+    }
+    return v6Address.tov4().parsedAddress
+}

lib/IPParser.js

@@ -6,7 +6,9 @@ module.exports = IPParser;
 
 function IPParser(ip) {
     if (ip.indexOf('.') !== -1) {
-        return IPParser.parseIPv4(ip);
+        if (ip.indexOf(':') !== -1){
+            return IPParser.parseIPv4MappedIPv6(ip)
+        } else return IPParser.parseIPv4(ip);
     } else {
         return IPParser.parseIPv6(ip);
     }
@@ -20,6 +22,10 @@ IPParser.parseIPv6 = function parseIPv6(ip) {
     return ipv6Buffer(IPAddress.parseIPv6(ip));
 };
 
+IPParser.parseIPv4MappedIPv6 = function parseIPv4MappedIPv6(ip){
+    return ipv4Buffer(IPAddress.parseIPv4MappedIPv6(ip));
+}
+
 function ipv4Buffer(groups) {
     var arr = new Buffer(4);
     arr.fill(0);

package.json

@@ -37,7 +37,7 @@
     },
     "dependencies": {
         "big-integer": ">=1.1.5",
-        "ip-address": "4.0.0"
+        "ip-address": "4.2.0"
     },
     "devDependencies": {
         "istanbul": "^0.3.13",

test/test-ipparser.js

@@ -38,9 +38,24 @@ ipParseTest('IPv6', function run(it) {
         t.end();
     });
 
-    it('should throw exception on invalid ipv4 formats', function should(t) {
+    it('should throw exception on invalid ipv6 formats', function should(t) {
         t.verifyParseThrows('myipaddress');
-        t.verifyParseThrows('::ffff:192.0.2.128');
+        t.verifyParseThrows('2001:0db8:85a3:00000000:8a2e:0370:7334');
+        t.verifyParseThrows('2001:db8:85a3:8a2e:370:7334');
+        t.end();
+    });
+});
+
+ipParseTest('IPv4-Mapped IPv6', function run(it) {
+    it('should successfully parse correct formats', function should(t) {
+        t.verifyParse('::ffff:192.0.2.128', new Buffer([0xc0, 0x00, 0x02, 0x80]));
+        t.verifyParse('0:0:0:0:0:FFFF:222.1.41.90', new Buffer([0xde, 0x01, 0x29, 0x5a]));
+        t.end();
+    });
+
+    it('should throw exception on invalid IPv6 address with Embedded IPv4 address', function should(t) {
+        t.verifyParseThrows(':192.0.2.128');
+        t.verifyParseThrows('::ffff:192.0.2.128:');
         t.end();
     });
 });