Milestone 5: deliver embedded RDP sessions and lifecycle hardening

third_party/FreeRDP/winpr/libwinpr/utils/android.c

@@ -0,0 +1,77 @@
+/**
+ * FreeRDP: A Remote Desktop Protocol Implementation
+ * Winpr android helpers
+ *
+ * Copyright 2022 Armin Novak <armin.novak@thincast.com>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "android.h"
+#include <jni.h>
+
+#include <winpr/winpr.h>
+#include <winpr/assert.h>
+
+#include "../log.h"
+
+#define TAG WINPR_TAG("android")
+
+JavaVM* jniVm = nullptr;
+
+WINPR_API jint JNI_OnLoad(JavaVM* vm, void* reserved)
+{
+	WLog_INFO(TAG, "Setting up JNI environment...");
+
+	jniVm = vm;
+	return JNI_VERSION_1_6;
+}
+
+WINPR_API void JNICALL JNI_OnUnload(JavaVM* vm, void* reserved)
+{
+	JNIEnv* env = nullptr;
+	WLog_INFO(TAG, "Tearing down JNI environment...");
+
+	if ((*jniVm)->GetEnv(vm, (void**)&env, JNI_VERSION_1_6) != JNI_OK)
+	{
+		WLog_FATAL(TAG, "Failed to get the environment");
+		return;
+	}
+}
+
+jboolean winpr_jni_attach_thread(JNIEnv** env)
+{
+	WINPR_ASSERT(jniVm);
+
+	if ((*jniVm)->GetEnv(jniVm, (void**)env, JNI_VERSION_1_4) != JNI_OK)
+	{
+		WLog_INFO(TAG, "android_java_callback: attaching current thread");
+		(*jniVm)->AttachCurrentThread(jniVm, env, nullptr);
+
+		if ((*jniVm)->GetEnv(jniVm, (void**)env, JNI_VERSION_1_4) != JNI_OK)
+		{
+			WLog_ERR(TAG, "android_java_callback: failed to obtain current JNI environment");
+		}
+
+		return JNI_TRUE;
+	}
+
+	return JNI_FALSE;
+}
+
+/* attach current thread to JVM */
+void winpr_jni_detach_thread(void)
+{
+	WINPR_ASSERT(jniVm);
+	(*jniVm)->DetachCurrentThread(jniVm);
+}