src/file_binary_writer.cpp

/*
 * Copyright 2023 Google Inc. All rights reserved.
 *
 * Licensed 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.
 */

#include <fstream>
#include <set>
#include <string>

#include "flatbuffers/file_manager.h"

namespace flatbuffers {

class FileBinaryWriter : public FileManager {
 public:
  bool SaveFile(const std::string &absolute_file_name,
                const std::string &content) override {
    std::ofstream ofs(absolute_file_name, std::ofstream::binary);
    if (!ofs.is_open()) return false;
    ofs.write(content.c_str(), content.size());
    return !ofs.bad();
  }

  bool Loadfile(const std::string &absolute_file_name, std::string *output) {
    if (DirExists(absolute_file_name.c_str())) return false;
    std::ifstream ifs(absolute_file_name, std::ifstream::binary);
    if (!ifs.is_open()) return false;
    // The fastest way to read a file into a string.
    ifs.seekg(0, std::ios::end);
    auto size = ifs.tellg();
    (*output).resize(static_cast<size_t>(size));
    ifs.seekg(0, std::ios::beg);
    ifs.read(&(*output)[0], (*output).size());
    return !ifs.bad();
  }
};

}  // namespace flatbuffers