lazily_loaded_file.h

Go to the documentation of this file.

//
// Copyright (C) 2025 The Android Open Source Project
//
// 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.
#pragma once
 
#include <stddef.h>
 
#include <memory>
#include <string>
 
#include "cuttlefish/io/io.h"
#include "cuttlefish/result/result.h"
 
namespace cuttlefish {
 
class LazilyLoadedFile {
 public:
  static Result<LazilyLoadedFile> Create(std::string filename, size_t size,
                                         std::unique_ptr<ReaderSeeker>);
 
  LazilyLoadedFile(LazilyLoadedFile&&);
  ~LazilyLoadedFile();
  LazilyLoadedFile& operator=(LazilyLoadedFile&&);
 
  Result<size_t> Read(char*, size_t);
  Result<void> Seek(size_t);
 
 private:
  struct Impl;
 
  LazilyLoadedFile(std::unique_ptr<Impl>);
 
  std::unique_ptr<Impl> impl_;
};
 
}  // namespace cuttlefish