Moved JNI helper macros to a separate file

Also initialize a reference to the CharonVpnService class during
JNI_OnLoad, which allows us later to call methods from C to Java.

src/frontends/android/jni/libandroidbridge/Android.mk

@@ -3,6 +3,7 @@ include $(CLEAR_VARS)
 
 # copy-n-paste from Makefile.am
 LOCAL_SRC_FILES := \
+android_jni.c android_jni.h \
 charonservice.c
 
 # build libandroidbridge -------------------------------------------------------

src/frontends/android/jni/libandroidbridge/android_jni.c

@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2012 Tobias Brunner
+ * Copyright (C) 2012 Giuliano Grassi
+ * Copyright (C) 2012 Ralf Sager
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#include "android_jni.h"
+
+#include <library.h>
+
+/**
+ * JVM
+ */
+static JavaVM *android_jvm;
+
+jclass *android_charonvpnservice_class;
+
+/**
+ * Called when this library is loaded by the JVM
+ */
+jint JNI_OnLoad(JavaVM *vm, void *reserved)
+{
+    JNIEnv *env;
+
+	android_jvm = vm;
+
+	if ((*vm)->GetEnv(vm, (void**)&env, JNI_VERSION_1_6) != JNI_OK)
+	{
+		return -1;
+	}
+
+	android_charonvpnservice_class =
+				(*env)->NewGlobalRef(env, (*env)->FindClass(env,
+						JNI_PACKAGE_STRING "/CharonVpnService"));
+
+	return JNI_VERSION_1_6;
+}
+

src/frontends/android/jni/libandroidbridge/android_jni.h

@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2012 Tobias Brunner
+ * Copyright (C) 2012 Giuliano Grassi
+ * Copyright (C) 2012 Ralf Sager
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+/**
+ * @defgroup android_jni android_jni
+ * @{ @ingroup libandroidbridge
+ */
+
+#ifndef ANDROID_JNI_H_
+#define ANDROID_JNI_H_
+
+#include <jni.h>
+
+#define JNI_PACKAGE org_strongswan_android
+#define JNI_PACKAGE_STRING "org/strongswan/android"
+
+#define JNI_METHOD_PP(pack, klass, name, ret, ...) \
+	ret Java_##pack##_##klass##_##name(JNIEnv *env, jobject this, ##__VA_ARGS__)
+
+#define JNI_METHOD_P(pack, klass, name, ret, ...) \
+	JNI_METHOD_PP(pack, klass, name, ret, ##__VA_ARGS__)
+
+#define JNI_METHOD(klass, name, ret, ...) \
+	JNI_METHOD_P(JNI_PACKAGE, klass, name, ret, ##__VA_ARGS__)
+
+/**
+ * Java classes
+ * Initialized in JNI_OnLoad()
+ */
+extern jclass *android_charonvpnservice_class;
+
+#endif /** ANDROID_JNI_H_ @}*/

src/frontends/android/jni/libandroidbridge/charonservice.c

@@ -1,4 +1,6 @@
 /*
+ * Copyright (C) 2012 Giuliano Grassi
+ * Copyright (C) 2012 Ralf Sager
  * Copyright (C) 2012 Tobias Brunner
  * Hochschule fuer Technik Rapperswil
  *
@@ -15,28 +17,19 @@
 
 #include <string.h>
 #include <android/log.h>
-#include <jni.h>
 
+#include "android_jni.h"
+
+#include <daemon.h>
 #include <hydra.h>
 #include <ipsec.h>
-#include <daemon.h>
 #include <library.h>
 
-#define JNI_PACKAGE org_strongswan_android
-
-#define JNI_METHOD_PP(pack, klass, name, ret, ...) \
-	ret Java_##pack##_##klass##_##name(JNIEnv *env, jobject this, ##__VA_ARGS__)
-
-#define JNI_METHOD_P(pack, klass, name, ret, ...) \
-	JNI_METHOD_PP(pack, klass, name, ret, ##__VA_ARGS__)
-
-#define JNI_METHOD(klass, name, ret, ...) \
-	JNI_METHOD_P(JNI_PACKAGE, klass, name, ret, ##__VA_ARGS__)
 
 /**
  * hook in library for debugging messages
  */
-extern void (*dbg) (debug_t group, level_t level, char *fmt, ...);
+extern void (*dbg)(debug_t group, level_t level, char *fmt, ...);
 
 /**
  * Logging hook for library logs, using android specific logging