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Add serialization versioning

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This commit is contained in:
Lonami Exo 2017-02-10 13:31:40 +01:00
parent c02c00ee64
commit 07bec548b6
2 changed files with 24 additions and 0 deletions
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BIN
android/assets/.klooni.sav
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Binary file not shown.

24
core/src/io/github/lonamiwebs/klooni/serializer/BinSerializer.java
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@ -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 {