Add ipv4 handling back

Author: faktas2

src/main/java/com/maxmind/db/Networks.java

@@ -84,7 +84,7 @@ public DatabaseRecord<T> next() {
             // We do this because uses of includeAliasedNetworks will get IPv4 networks
             // from the ::FFFF:0:0/96. We want to return the IPv4 form of the address
             // in that case.
-            if (isInIpv4Subtree(ip)) {
+            if (!this.includeAliasedNetworks && isInIpv4Subtree(ip)) {
                 ip = Arrays.copyOfRange(ip, 12, ip.length);
                 prefixLength -= 96;
             }

src/main/java/com/maxmind/db/Reader.java

@@ -307,8 +307,15 @@ public <T> Networks<T> networksWithin(
         int prefixLength = network.getPrefixLength();
 
         if (this.metadata.getIpVersion() == 6 && ipBytes.length == IPV4_LEN) {
-            ipBytes = new byte[]{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-                ipBytes[0], ipBytes[1], ipBytes[2], ipBytes[3] };
+            if (includeAliasedNetworks) {
+                // Convert it to the IP address (in 16-byte from) of the IPv4 address.
+                ipBytes = new byte[]{0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+                    -1, -1, // -1 is for 0xff.
+                    ipBytes[0], ipBytes[1], ipBytes[2], ipBytes[3]};
+            } else {
+                ipBytes = new byte[]{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+                    ipBytes[0], ipBytes[1], ipBytes[2], ipBytes[3] };
+            }
             prefixLength += 96;
         }
 

src/test/java/com/maxmind/db/ReaderTest.java

@@ -258,13 +258,12 @@ public networkTest(String network,  int prefix,String database, String[] expecte
             0,
             "mixed",
             new String[]{
-                // ::/96
-                "1.1.1.1/32",
-                "1.1.1.2/31",
-                "1.1.1.4/30",
-                "1.1.1.8/29",
-                "1.1.1.16/28",
-                "1.1.1.32/32",
+                "0:0:0:0:0:0:101:101/128",
+                "0:0:0:0:0:0:101:102/127",
+                "0:0:0:0:0:0:101:104/126",
+                "0:0:0:0:0:0:101:108/125",
+                "0:0:0:0:0:0:101:110/124",
+                "0:0:0:0:0:0:101:120/128",
                 "0:0:0:0:0:1:ffff:ffff/128",
                 "0:0:0:0:0:2:0:0/122",
                 "0:0:0:0:0:2:0:40/124",