From 3a9df5f3175384b6a0661267fb59f51021109d83 Mon Sep 17 00:00:00 2001
From: Christian Weiske <cweiske@cweiske.de>
Date: Thu, 30 Jan 2020 21:36:29 +0100
Subject: [PATCH 1/1]

---
 README.rst  |  1 +
 xposed.java | 72 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 73 insertions(+)
 create mode 100644 README.rst
 create mode 100644 xposed.java

diff --git a/README.rst b/README.rst
new file mode 100644
index 0000000..c841727
--- /dev/null
+++ b/README.rst
@@ -0,0 +1 @@
+It did not work. FF3 still crashes.
\ No newline at end of file
diff --git a/xposed.java b/xposed.java
new file mode 100644
index 0000000..fc63f6c
--- /dev/null
+++ b/xposed.java
@@ -0,0 +1,72 @@
+import java.lang.reflect.Method;
+
+import de.robv.android.xposed.IXposedHookCmdInit;
+import de.robv.android.xposed.XC_MethodHook;
+import de.robv.android.xposed.XposedBridge;
+import de.robv.android.xposed.XposedHelpers;
+import de.robv.android.xposed.callbacks.XC_LoadPackage;
+
+public class Mypackage implements IXposedHookCmdInit
+{
+    @Override
+    public void initCmdApp(StartupParam startupParam) throws Throwable {
+        if (!startupParam.startClassName.equals("com.android.commands.pm.Pm")) {
+            return;
+        }
+        //XposedBridge.log("startup:" + startupParam.startClassName);
+
+        /*
+         Final Fantasy 3 has a native library lib__57d5__.so that tries to clear the data
+         for all apk files in /data/app/. We do not know why.
+
+         It fails to do this for root-owned packages like this xposed module.
+         See
+         https://forum.xda-developers.com/xposed/framework-xposed-rom-modding-modifying-t1574401/page170#1700
+
+         We simply prevent it from doing that.
+
+         https://android.googlesource.com/platform/frameworks/base/+/refs/tags/android-4.1.2_r1/core/java/android/app/ActivityManagerNative.java#2880
+
+         public boolean clearApplicationUserData(
+             String packageName, IPackageDataObserver observer, final int userId
+         )
+         */
+        XposedHelpers.findAndHookMethod(
+            "android.app.ActivityManagerProxy",
+            null,
+            "clearApplicationUserData",
+            String.class,
+            "android.content.pm.IPackageDataObserver",
+            int.class,
+            new XC_MethodHook() {
+                @Override
+                protected void beforeHookedMethod(MethodHookParam param) throws Throwable {
+                    String packageName = (String) param.args[0];
+                    XposedBridge.log("clearApplicationUserData: " + packageName);
+                    if (!packageName.equals("mypackage")) {
+                        return;
+                    }
+
+                    param.setResult(true);
+
+                    //we do not have direct access to IPackageDataObserver, so we have to dance
+                    Object observer = param.args[1];
+                    if(observer != null) {
+                        Class<?> iPackageDataObserverClass = Class.forName("android.content.pm.IPackageDataObserver");
+                        Class<?>[] paramTypes = {String.class, boolean.class};
+                        Method onRemoveCompletedMethod = iPackageDataObserverClass.getMethod("onRemoveCompleted", paramTypes);
+                        Object[] params = {packageName, true};
+                        try {
+                            onRemoveCompletedMethod.invoke(observer, params);
+                            //observer.onRemoveCompleted(packageName, true);
+                        } catch (Exception e) {
+                            XposedBridge.log("Observer no longer exists.");
+                        }
+                    }
+                    //end dance
+                }
+            }
+        );
+
+    }
+}
-- 
2.30.2