add exec function in jni

src/android.cpp

@@ -20,12 +20,71 @@ typedef union {
     void* venv;
 } UnionJNIEnvToVoid;
 
+typedef unsigned short char16_t;
+
+class String8 {
+public:
+    String8() {
+        mString = 0;
+    }
+
+    ~String8() {
+        if (mString) {
+            free(mString);
+        }
+    }
+
+    void set(const char16_t* o, size_t numChars) {
+        if (mString) {
+            free(mString);
+        }
+        mString = (char*) malloc(numChars + 1);
+        if (!mString) {
+            return;
+        }
+        for (size_t i = 0; i < numChars; i++) {
+            mString[i] = (char) o[i];
+        }
+        mString[numChars] = '\0';
+    }
+
+    const char* string() {
+        return mString;
+    }
+private:
+    char* mString;
+};
+
 static UnionJNIEnvToVoid uenv;
 static jmethodID newProtectedSocketMethod = NULL;
 static jmethodID freeProtectedSocketMethod = NULL;
 static jclass clazz = NULL;
 
-static const char *classPathName = "com/github/shadowsocks/Socket";
+static const char *classPathName = "com/github/shadowsocks/Daemon";
+
+void Java_com_github_shadowsocks_daemon_exec(JNIEnv *env, jobject thiz, jobjectArray argv) {
+
+    int argc = argv ? env->GetArrayLength(argv) : 0;
+    char **daemon_argv = NULL;
+    String8 tmp_8;
+
+    if (argc > 0) {
+        daemon_argv = (char **)malloc((argc+1)*sizeof(char *));
+        for (int i = 0; i < argc; ++i) {
+            jstring arg = reinterpret_cast<jstring>(env->GetObjectArrayElement(argv, i));
+            const jchar *str = env->GetStringCritical(arg, 0);
+            tmp_8.set(str, env->GetStringLength(arg));
+            env->ReleaseStringCritical(arg, str);
+            daemon_argv[i] = strdup(tmp_8.string());
+        }
+        daemon_argv[args] = NULL;
+    }
+
+    int ret = main(argc, daemon_argv);
+
+    for (init i = 0; i < argc; i++) free(daemon_argv[i]);
+    free(daemon_argv);
+}
 
 /*
  * Register several native methods for one class.
@@ -54,6 +113,16 @@ static int registerNativeMethods(JNIEnv* env, const char* className)
         return JNI_FALSE;
     }
 
+    JNINativeMethod methods[] = {
+        { "exec", "([Ljava/lang/String;)V",
+        (void*) Java_com_github_shadowsocks_daemon_exec }
+    };
+
+    if (env->RegisterNatives(clazz, methods, 1) < 0) {
+        LOGE("RegisterNatives failed for '%s'", className);
+        return JNI_FALSE;
+    }
+
     return JNI_TRUE;
 }