adamdebreceni commented on a change in pull request #1211: URL: https://github.com/apache/nifi-minifi-cpp/pull/1211#discussion_r748235408
########## File path: libminifi/include/utils/file/FileView.h ########## @@ -0,0 +1,184 @@ +/** + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#pragma once + +#include <filesystem> +#include <fstream> +#include <string> +#include <memory> + +#include "utils/gsl.h" +#include "core/logging/LoggerConfiguration.h" + +#ifdef WIN32 +#include <stdio.h> +#include <Windows.h> +#else +#include <sys/mman.h> +#include <fcntl.h> +#include <unistd.h> +#endif + +namespace org::apache::nifi::minifi::utils::file { + +class FileView { + static std::string getLastError() { +#ifdef WIN32 + return std::system_category().message(GetLastError()); +#else + return std::system_category().message(errno); +#endif + } +#ifdef WIN32 + struct FileHandle { Review comment: `std::ifstream` is an input iterator and not a forward iterator, so `std::search` does not operate on it, we could read the file chunk by chunk but then we would have to cover edge cases like the id appearing on the boundary, tried wrapping the `std::ifstream` to accommodate it for `std::search` but it took tens of seconds with the constant seeks, the memory-mapped solution runs in tens of milliseconds, also we could use the Boyer-Moore searcher I think it is best to use standard library utilities whenever possible instead of hand-rolling our own search implementation -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: issues-unsubscr...@nifi.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
