+/*
+ * This file is part of the sigrok project.
+ *
+ * Copyright (C) 2014 Marcus Comstedt <marcus@mc.pp.se>
+ *
+ * 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 3 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "libsigrokandroidutils.h"
+#include "libsigrokandroidutils-internal.h"
+
+static JavaVM *g_jvm = NULL;
+static jclass g_environment_class = 0;
+
+SRAU_PRIV int srau_get_java_env(JNIEnv **env)
+{
+ jint st;
+
+ if (g_jvm == NULL) {
+ return -1;
+ }
+
+ st = g_jvm->GetEnv((void **)env, JNI_VERSION_1_6);
+
+ if (st == JNI_EDETACHED) {
+ st = g_jvm->AttachCurrentThread(env, NULL);
+ if (st == JNI_OK)
+ return 1;
+ }
+
+ return (st == JNI_OK? 0 : -1);
+}
+
+SRAU_PRIV void srau_unget_java_env(int mode)
+{
+ if (mode == 1) {
+ g_jvm->DetachCurrentThread();
+ }
+}
+
+SRAU_PRIV jclass srau_get_environment_class(JNIEnv *env)
+{
+ if (env && g_environment_class) {
+ return (jclass)env->NewLocalRef(g_environment_class);
+ } else {
+ return 0;
+ }
+}
+
+jint JNI_OnLoad(JavaVM *vm, void *reserved)
+{
+ JNIEnv* env;
+
+ (void)reserved;
+
+ if (vm->GetEnv((void **)&env, JNI_VERSION_1_6) != JNI_OK) {
+ return -1;
+ }
+
+ jclass envc = env->FindClass("org/sigrok/androidutils/Environment");
+ if (envc) {
+ g_environment_class = (jclass)env->NewGlobalRef(envc);
+ env->DeleteLocalRef(envc);
+ }
+
+ g_jvm = vm;
+
+ return JNI_VERSION_1_6;
+}
+
+void JNI_OnUnload(JavaVM *vm, void *reserved)
+{
+ JNIEnv* env;
+
+ (void)reserved;
+
+ g_jvm = NULL;
+
+ if (vm->GetEnv((void **)&env, JNI_VERSION_1_6) != JNI_OK) {
+ return;
+ }
+
+ if (g_environment_class) {
+ env->DeleteGlobalRef(g_environment_class);
+ g_environment_class = 0;
+ }
+}