std::string JNIHelper::GetExternalFilesDir() {
if (activity_ == NULL) {
LOGI(
"JNIHelper has not been initialized. Call init() to initialize the "
"helper");
return std::string("");
}
pthread_mutex_lock(&mutex_);
// First, try reading from externalFileDir;
JNIEnv* env;
activity_->vm->AttachCurrentThread(&env, NULL);
jstring strPath = GetExternalFilesDirJString(env);
const char* path = env->GetStringUTFChars(strPath, NULL);
std::string s(path);
env->ReleaseStringUTFChars(strPath, path);
env->DeleteLocalRef(strPath);
activity_->vm->DetachCurrentThread();
pthread_mutex_unlock(&mutex_);
return s;
}
/*
* ReadFile
*/
bool JNIHelper::ReadFile(const char *fileName,
std::vector<uint8_t> *buffer_ref) {
if (activity_ == NULL) {
LOGI("JNIHelper has not been initialized.Call init() to initialize the "
"helper");
return false;
}
// Lock mutex
std::lock_guard<std::mutex> lock(mutex_);
// First, try reading from externalFileDir;
JNIEnv *env = AttachCurrentThread();
jstring str_path = GetExternalFilesDirJString(env);
const char *path = env->GetStringUTFChars(str_path, NULL);
std::string s(path);
if (fileName[0] != '/') {
s.append("/");
}
s.append(fileName);
std::ifstream f(s.c_str(), std::ios::binary);
env->ReleaseStringUTFChars(str_path, path);
env->DeleteLocalRef(str_path);
activity_->vm->DetachCurrentThread();
if (f) {
LOGI("reading:%s", s.c_str());
f.seekg(0, std::ifstream::end);
int32_t fileSize = f.tellg();
f.seekg(0, std::ifstream::beg);
buffer_ref->reserve(fileSize);
buffer_ref->assign(std::istreambuf_iterator<char>(f),
std::istreambuf_iterator<char>());
f.close();
return true;
} else {
//Fallback to assetManager
AAssetManager *assetManager = activity_->assetManager;
AAsset *assetFile =
AAssetManager_open(assetManager, fileName, AASSET_MODE_BUFFER);
if (!assetFile) {
return false;
}
uint8_t *data = (uint8_t *)AAsset_getBuffer(assetFile);
int32_t size = AAsset_getLength(assetFile);
if (data == NULL) {
AAsset_close(assetFile);
LOGI("Failed to load:%s", fileName);
return false;
}
buffer_ref->reserve(size);
buffer_ref->assign(data, data + size);
AAsset_close(assetFile);
return true;
}
}
