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      1 /*
      2  * Copyright (C) 2014 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #define LOG_TAG "SplitApp"
     18 
     19 #include <android/log.h>
     20 #include <stdio.h>
     21 
     22 #include "jni.h"
     23 
     24 #define  LOGE(...)  __android_log_print(ANDROID_LOG_ERROR,LOG_TAG,__VA_ARGS__)
     25 #define  LOGI(...)  __android_log_print(ANDROID_LOG_INFO,LOG_TAG,__VA_ARGS__)
     26 
     27 
     28 static jint add(JNIEnv *env, jobject thiz, jint a, jint b) {
     29     int result = a + b;
     30     LOGI("%d + %d = %d", a, b, result);
     31     return result;
     32 }
     33 
     34 static jstring arch(JNIEnv *env, jobject thiz) {
     35     return env->NewStringUTF(__ANDROID_ARCH__);
     36 }
     37 
     38 static const char *classPathName = "com/android/cts/splitapp/Native";
     39 
     40 static JNINativeMethod methods[] = {
     41     {"add", "(II)I", (void*)add },
     42     {"arch", "()Ljava/lang/String;", (void*)arch },
     43 };
     44 
     45 static int registerNativeMethods(JNIEnv* env, const char* className, JNINativeMethod* gMethods, int numMethods) {
     46     jclass clazz;
     47 
     48     clazz = env->FindClass(className);
     49     if (clazz == NULL) {
     50         LOGE("Native registration unable to find class '%s'", className);
     51         return JNI_FALSE;
     52     }
     53     if (env->RegisterNatives(clazz, gMethods, numMethods) < 0) {
     54         LOGE("RegisterNatives failed for '%s'", className);
     55         return JNI_FALSE;
     56     }
     57 
     58     return JNI_TRUE;
     59 }
     60 
     61 static int registerNatives(JNIEnv* env) {
     62     if (!registerNativeMethods(env, classPathName, methods, sizeof(methods) / sizeof(methods[0]))) {
     63         return JNI_FALSE;
     64     }
     65 
     66     return JNI_TRUE;
     67 }
     68 
     69 typedef union {
     70     JNIEnv* env;
     71     void* venv;
     72 } UnionJNIEnvToVoid;
     73 
     74 jint JNI_OnLoad(JavaVM* vm, void* reserved) {
     75     UnionJNIEnvToVoid uenv;
     76     uenv.venv = NULL;
     77     jint result = -1;
     78     JNIEnv* env = NULL;
     79 
     80     LOGI("JNI_OnLoad");
     81 
     82     if (vm->GetEnv(&uenv.venv, JNI_VERSION_1_4) != JNI_OK) {
     83         LOGE("ERROR: GetEnv failed");
     84         goto bail;
     85     }
     86     env = uenv.env;
     87 
     88     if (registerNatives(env) != JNI_TRUE) {
     89         LOGE("ERROR: registerNatives failed");
     90         goto bail;
     91     }
     92 
     93     result = JNI_VERSION_1_4;
     94 
     95 bail:
     96     return result;
     97 }
     98