From 07bec548b68a46a4cb2d36230e22503e400ad952 Mon Sep 17 00:00:00 2001
From: Lonami Exo <totufals@hotmail.com>
Date: Fri, 10 Feb 2017 13:31:40 +0100
Subject: [PATCH] Add serialization versioning

---
 android/assets/.klooni.sav                    | Bin 427 -> 446 bytes
 .../klooni/serializer/BinSerializer.java      |  24 ++++++++++++++++++
 2 files changed, 24 insertions(+)

diff --git a/android/assets/.klooni.sav b/android/assets/.klooni.sav
index 4382609402d4759f141ad06e6f911cf191c8c9e7..2b2abd0e75641d157ae5dcfdeec5111b9b3cbb9c 100644
GIT binary patch
literal 446
zcmd1K$<NQr<YHi8U<6_i0I@k>_&*W=ih<N1V-6%~I1^0`NIh0{a1B5PPz@^xBa2~U
g50pA=ZlP2R<`)=^%RHbwGbj)d1Urx?35<!m0Mp_w`v3p{

literal 427
zcmZQz00XZ76ab(J959T}7?2u#@-R7K)xp$LLIdq$2Vp{H5Tk~W8KlSq?PF$O1d?C?
I3|_{&00*yc(EtDd

diff --git a/core/src/io/github/lonamiwebs/klooni/serializer/BinSerializer.java b/core/src/io/github/lonamiwebs/klooni/serializer/BinSerializer.java
index d58b665..a56af99 100644
--- a/core/src/io/github/lonamiwebs/klooni/serializer/BinSerializer.java
+++ b/core/src/io/github/lonamiwebs/klooni/serializer/BinSerializer.java
@@ -5,12 +5,23 @@ import java.io.DataOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
+import java.util.Arrays;
 
 public class BinSerializer {
+
+    // ascii (klooni) and binary (1010b)
+    private static byte[] HEADER = { 0x6B, 0x6C, 0x6F, 0x6F, 0x6E, 0x69, 0xa };
+
+    // MODIFY THIS VALUE EVERY TIME A BinSerializable IMPLEMENTATION CHANGES
+    // Or unwanted results will happen and corrupt the game in an unknown way.
+    private static int VERSION = 1;
+
     public static void serialize(final BinSerializable serializable, final OutputStream output)
             throws IOException {
         DataOutputStream out = new DataOutputStream(output);
         try {
+            out.write(HEADER);
+            out.writeInt(VERSION);
             serializable.write(out);
         } finally {
             try {
@@ -23,6 +34,19 @@ public class BinSerializer {
             throws IOException {
         DataInputStream in = new DataInputStream(input);
         try {
+            // Read the HEADER and the VERSION (checks)
+            byte[] savedBuffer = new byte[HEADER.length];
+            in.readFully(savedBuffer);
+            if (!Arrays.equals(savedBuffer, HEADER))
+                throw new IOException("Invalid saved header found.");
+
+            int savedVersion = in.readInt();
+            if (savedVersion != VERSION) {
+                throw new IOException(
+                        "Invalid saved version found. Should be " + VERSION + ", not " + savedVersion);
+            }
+
+            // Read the saved data if the checks passed
             serializable.read(in);
         } finally {
             try {