Game metadata extractor and some fixes

- App not closing on back pressed (AlberInputListener.java)
- Extract SMDH from rom.
- Extract metadata from SMDH

src/jni_driver.cpp

@@ -8,10 +8,14 @@
 #include "renderer_gl/renderer_gl.hpp"
 #include "services/hid.hpp"
 
+#include "jni_driver.hpp"
+
 std::unique_ptr<Emulator> emulator = nullptr;
 HIDService* hidService = nullptr;
 RendererGL* renderer = nullptr;
 bool romLoaded = false;
+JavaVM* jvm = nullptr;
+const char* alberClass = "com/panda3ds/pandroid/AlberDriver";
 
 #define AlberFunction(type, name) JNIEXPORT type JNICALL Java_com_panda3ds_pandroid_AlberDriver_##name
 
@@ -20,7 +24,47 @@ void throwException(JNIEnv* env, const char* message) {
 	env->ThrowNew(exceptionClass, message);
 }
 
+JNIEnv* jniEnv(){
+    JNIEnv* env;
+    auto status = jvm->GetEnv((void **)&env, JNI_VERSION_1_6);
+    if(status == JNI_EDETACHED){
+        jvm->AttachCurrentThread(&env, nullptr);
+    } else if(status != JNI_OK){
+        throw std::runtime_error("Failed to obtain JNIEnv from JVM!!");
+    }
+    return env;
+}
+
+
+void Pandroid::onSmdhLoaded(const std::vector<u8> &smdh){
+    JNIEnv* env = jniEnv();
+    int size = smdh.size();
+    
+    jbyteArray result = env->NewByteArray(size);
+    
+    jbyte buffer[size];
+    
+    for(int i = 0; i < size; i++){
+        buffer[i] = (jbyte) smdh[i];
+    }
+    env->SetByteArrayRegion(result, 0, size, buffer);
+
+    
+    auto clazz = env->FindClass(alberClass);
+    auto method = env->GetStaticMethodID(clazz, "OnSmdhLoaded", "([B)V");
+
+    env->CallStaticVoidMethod(clazz, method, result);
+
+    env->DeleteLocalRef(result);
+}
+
+
 extern "C" {
+
+AlberFunction(void, Setup)(JNIEnv* env, jobject obj) {
+    env->GetJavaVM(&jvm);
+}
+
 AlberFunction(void, Initialize)(JNIEnv* env, jobject obj) {
 	emulator = std::make_unique<Emulator>();
 
@@ -73,4 +117,4 @@ AlberFunction(void, SetCirclepadAxis)(JNIEnv* env, jobject obj, jint x, jint y)
 }
 }
 
-#undef AlberFunction
+#undef AlberFunction