From d2dd84640aa6a064ae23dde9bb187e2a1cf690e2 Mon Sep 17 00:00:00 2001
From: canyie <a1364259@163.com>
Date: Mon, 25 Jan 2021 15:46:24 +0800
Subject: [PATCH] Load XResources's dex data from memory

---
 .../main/java/top/canyie/dreamland/Main.java  | 25 ++++++++++++++++---
 .../canyie/dreamland/utils/RuntimeUtils.java  |  7 +++---
 2 files changed, 25 insertions(+), 7 deletions(-)

diff --git a/app/src/main/java/top/canyie/dreamland/Main.java b/app/src/main/java/top/canyie/dreamland/Main.java
index bbc58c3..927b100 100644
--- a/app/src/main/java/top/canyie/dreamland/Main.java
+++ b/app/src/main/java/top/canyie/dreamland/Main.java
@@ -19,6 +19,8 @@
 
 import androidx.annotation.Keep;
 
+import dalvik.system.InMemoryDexClassLoader;
+import dalvik.system.PathClassLoader;
 import de.robv.android.xposed.DexCreator;
 import de.robv.android.xposed.XposedBridge;
 import top.canyie.dreamland.core.Dreamland;
@@ -35,6 +37,7 @@
 import java.lang.reflect.Field;
 import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Modifier;
+import java.nio.ByteBuffer;
 
 import mirror.android.app.ActivityThread;
 import mirror.android.os.ServiceManager;
@@ -140,10 +143,11 @@ public static int init() {
         return 1;
     }
 
+    @SuppressLint("NewApi")
     private static void initXResources(ClassLoader myCL) throws Exception {
         Resources res = Resources.getSystem();
-        String dexForXResources = ensureSuperDexFor("XResources", res.getClass(), Resources.class);
 
+        Class resClass = res.getClass();
         Class<?> taClass = TypedArray.class;
         try {
             TypedArray ta = res.obtainTypedArray(res.getIdentifier("preloaded_drawables", "array", "android"));
@@ -153,10 +157,25 @@ private static void initXResources(ClassLoader myCL) throws Exception {
             XposedBridge.log(e);
         }
 
-        String dexForXTypedArray = ensureSuperDexFor("XTypedArray", taClass, TypedArray.class);
+        ClassLoader dummy;
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+            // Load dex from memory to prevent some detections
+            RuntimeUtils.makeExtendable(resClass);
+            RuntimeUtils.makeExtendable(taClass);
+            ByteBuffer dexForXResources = DexCreator.create("XResources", resClass);
+            ByteBuffer dexForXTypedArray = DexCreator.create("XTypedArray", taClass);
+            ByteBuffer[] buffers = new ByteBuffer[] {
+                    dexForXResources, dexForXTypedArray
+            };
+            dummy = new InMemoryDexClassLoader(buffers, myCL.getParent());
+        } else {
+            String dexForXResources = ensureSuperDexFor("XResources", resClass, Resources.class);
+            String dexForXTypedArray = ensureSuperDexFor("XTypedArray", taClass, TypedArray.class);
+            dummy = new PathClassLoader(dexForXResources + File.pathSeparator + dexForXTypedArray, myCL.getParent());
+        }
 
         // Inject a ClassLoader for the created classes as parent of XposedBridge's ClassLoader.
-        RuntimeUtils.injectDex(myCL, dexForXResources + File.pathSeparator + dexForXTypedArray);
+        RuntimeUtils.setParent(myCL, dummy);
 
         // native initialize resources hook.
         // this must be executed after XResourcesSuperClass is created,
diff --git a/app/src/main/java/top/canyie/dreamland/utils/RuntimeUtils.java b/app/src/main/java/top/canyie/dreamland/utils/RuntimeUtils.java
index f101f5b..79df92e 100644
--- a/app/src/main/java/top/canyie/dreamland/utils/RuntimeUtils.java
+++ b/app/src/main/java/top/canyie/dreamland/utils/RuntimeUtils.java
@@ -3,7 +3,7 @@
 import androidx.annotation.NonNull;
 
 import java.lang.reflect.Modifier;
-import dalvik.system.PathClassLoader;
+
 import top.canyie.dreamland.utils.reflect.Reflection;
 
 /**
@@ -26,8 +26,7 @@ public static void makeExtendable(Class<?> c) {
         }
     }
 
-    public static void injectDex(@NonNull ClassLoader target, @NonNull String path) {
-        PathClassLoader dummy = new PathClassLoader(path, target.getParent());
-        parent.setValue(target, dummy);
+    public static void setParent(@NonNull ClassLoader target, @NonNull ClassLoader newParent) {
+        parent.setValue(target, newParent);
     }
 }