Change how assets/xposed_init is read

The previous way ended up loading the file via a jar: URL, which caches
the file internally (i.e. keeps it open). That's not desired here, so
let's just read the file via the ZipFile API and decide ourselves when
to close it.

app/src/main/java/de/robv/android/xposed/XposedHelpers.java

@@ -21,6 +21,7 @@
 import java.util.List;
 import java.util.WeakHashMap;
 import java.util.concurrent.atomic.AtomicInteger;
+import java.util.zip.ZipFile;
 
 import dalvik.system.DexFile;
 import external.org.apache.commons.lang3.ClassUtils;
@@ -1511,6 +1512,17 @@ public static byte[] assetAsByteArray(Resources res, String path) throws IOExcep
 		}
 	}
 
+	/**
+	 * Invokes the {@link ZipFile#close()} method, ignoring IOExceptions.
+	 */
+	/*package*/ static void closeSilently(ZipFile zipFile) {
+		if (zipFile != null) {
+			try {
+				zipFile.close();
+			} catch (IOException ignored) {}
+		}
+	}
+
 	/**
 	 * Returns the lowercase hex string representation of a file's MD5 hash sum.
 	 */

app/src/main/java/de/robv/android/xposed/XposedInit.java

@@ -23,6 +23,8 @@
 import java.util.Arrays;
 import java.util.HashSet;
 import java.util.Map;
+import java.util.zip.ZipEntry;
+import java.util.zip.ZipFile;
 
 import dalvik.system.DexFile;
 import dalvik.system.PathClassLoader;
@@ -400,13 +402,24 @@ private static void loadModule(String apk, ClassLoader topClassLoader) {
 
 		closeSilently(dexFile);
 
-		ClassLoader mcl = new PathClassLoader(apk, XposedBridge.BOOTCLASSLOADER);
-		InputStream is = mcl.getResourceAsStream("assets/xposed_init");
-		if (is == null) {
-			Log.e(TAG, "assets/xposed_init not found in the APK");
+		ZipFile zipFile = null;
+		InputStream is;
+		try {
+			zipFile = new ZipFile(apk);
+			ZipEntry zipEntry = zipFile.getEntry("assets/xposed_init");
+			if (zipEntry == null) {
+				Log.e(TAG, "  assets/xposed_init not found in the APK");
+				closeSilently(zipFile);
+				return;
+			}
+			is = zipFile.getInputStream(zipEntry);
+		} catch (IOException e) {
+			Log.e(TAG, "  Cannot read assets/xposed_init in the APK", e);
+			closeSilently(zipFile);
 			return;
 		}
 
+		ClassLoader mcl = new PathClassLoader(apk, XposedBridge.BOOTCLASSLOADER);
 		BufferedReader moduleClassesReader = new BufferedReader(new InputStreamReader(is));
 		try {
 			String moduleClassName;
@@ -457,6 +470,7 @@ private static void loadModule(String apk, ClassLoader topClassLoader) {
 			Log.e(TAG, "  Failed to load module from " + apk, e);
 		} finally {
 			closeSilently(is);
+			closeSilently(zipFile);
 		}
 	}
 }