Support short genie codes.

Author: trekawek

core/src/main/java/eu/rekawek/coffeegb/core/genie/GameGeniePatch.java

@@ -10,6 +10,9 @@ public int getAddress() {
 
     @Override
     public boolean accepts(AddressSpace addressSpace, boolean gbc) {
+        if (oldData == -1) {
+            return true;
+        }
         return addressSpace.getByte(address) == oldData;
     }
 

core/src/main/java/eu/rekawek/coffeegb/core/genie/PatchFactory.java

@@ -10,6 +10,8 @@ public final class PatchFactory {
 
     private static final Pattern GAME_GENIE_CODE = Pattern.compile("^([0-9A-Fa-f]{3})[+-]([0-9A-Fa-f]{3})[+-]([0-9A-Fa-f]{3})$");
 
+    private static final Pattern GAME_GENIE_SHORT_CODE = Pattern.compile("^([0-9A-Fa-f]{3})[+-]([0-9A-Fa-f]{3})$");
+
     private static final Pattern GAME_SHARK_CODE = Pattern.compile("^([0-9A-Fa-f]{8})$");
 
     private PatchFactory() {
@@ -26,6 +28,8 @@ public static List<Patch> createPatches(String code) {
     static Patch createPatch(String code) {
         if (GAME_GENIE_CODE.matcher(code).matches()) {
             return parseGameGenieCode(code);
+        } else if (GAME_GENIE_SHORT_CODE.matcher(code).matches()) {
+            return parseGameGenieShortCode(code);
         } else if (GAME_SHARK_CODE.matcher(code).matches()) {
             return parseGameSharkCode(code);
         } else {
@@ -41,6 +45,13 @@ private static GameGeniePatch parseGameGenieCode(String code) {
         return new GameGeniePatch(newData, address, oldData);
     }
 
+    private static GameGeniePatch parseGameGenieShortCode(String code) {
+        var c = code.toLowerCase().replace("-", "").toCharArray();
+        var newData = parse(c, 0, 1);
+        var address = parse(c, 5, 2, 3, 4) ^ 0xf000;
+        return new GameGeniePatch(newData, address, -1);
+    }
+
     private static GameSharkPatch parseGameSharkCode(String code) {
         var c = code.toLowerCase().toCharArray();
         var bank = parse(c, 0, 1);