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66 lines
2.3 KiB
66 lines
2.3 KiB
//
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// Copyright (C) 2016 The Android Open Source Project
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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// A filesystem parser based on the Android .map files. When generating a
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// filesystem with the Android tools, either squashfs or ext4, a .map file can
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// be generated at the same time with the list of files and the 4K-blocks where
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// the data for those files is located in the filesystem. This class parses this
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// .map text file instead of parsing the structure of the actual filesystem
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// contents.
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#ifndef UPDATE_ENGINE_PAYLOAD_GENERATOR_MAPFILE_FILESYSTEM_H_
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#define UPDATE_ENGINE_PAYLOAD_GENERATOR_MAPFILE_FILESYSTEM_H_
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#include "update_engine/payload_generator/filesystem_interface.h"
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#include <memory>
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#include <string>
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#include <vector>
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namespace chromeos_update_engine {
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class MapfileFilesystem : public FilesystemInterface {
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public:
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static std::unique_ptr<MapfileFilesystem> CreateFromFile(
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const std::string& filename, const std::string& mapfile_filename);
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virtual ~MapfileFilesystem() = default;
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// FilesystemInterface overrides.
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size_t GetBlockSize() const override;
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size_t GetBlockCount() const override;
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// All the generated FilesystemInterface::File are reported as regular files.
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// Files may overlap with other files in the same block.
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bool GetFiles(std::vector<File>* files) const override;
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bool LoadSettings(brillo::KeyValueStore* store) const override;
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private:
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MapfileFilesystem(const std::string& mapfile_filename, off_t num_blocks);
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// The file where the map filesystem is stored.
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std::string mapfile_filename_;
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// The number of blocks in the filesystem.
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off_t num_blocks_;
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DISALLOW_COPY_AND_ASSIGN(MapfileFilesystem);
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};
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} // namespace chromeos_update_engine
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#endif // UPDATE_ENGINE_PAYLOAD_GENERATOR_MAPFILE_FILESYSTEM_H_
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