//
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// Copyright (C) 2017 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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#ifndef UPDATE_ENGINE_PAYLOAD_GENERATOR_DEFLATE_UTILS_H_
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#define UPDATE_ENGINE_PAYLOAD_GENERATOR_DEFLATE_UTILS_H_
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#include <puffin/puffdiff.h>
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#include <vector>
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#include "update_engine/payload_generator/filesystem_interface.h"
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#include "update_engine/payload_generator/payload_generation_config.h"
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namespace chromeos_update_engine {
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namespace deflate_utils {
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// Gets the files from the partition and processes all its files. Processing
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// includes:
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// - splitting large Squashfs containers into its smaller files.
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// - extracting deflates in zip and gzip files.
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bool PreprocessPartitionFiles(const PartitionConfig& part,
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std::vector<FilesystemInterface::File>* result,
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bool extract_deflates);
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// Spreads all extents in |over_extents| over |base_extents|. Here we assume the
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// |over_extents| are non-overlapping and sorted by their offset.
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//
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// |base_extents|:
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// | ----------------------- ------ --------------
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// |over_extents|:
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// | ========== ==== ========== ======
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// |over_extents| is transforms to:
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// | ========== ==== = ====== === ======
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//
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bool ShiftExtentsOverExtents(const std::vector<Extent>& base_extents,
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std::vector<Extent>* over_extents);
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// Spreads all extents in |over_extents| over |base_extents|. Here we assume the
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// |over_extents| are non-overlapping and sorted by their offset. An item in
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// |over_extents| is removed if it is spread in two or more extents in
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// |base_extents|.
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//
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// |base_extents|:
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// | ----------------------- ------ --------------
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// |over_extents|:
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// | ========== ==== ========== ======
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// |over_extents| is transforms to:
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// | ========== ==== ======
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//
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bool ShiftBitExtentsOverExtents(const std::vector<Extent>& base_extents,
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std::vector<puffin::BitExtent>* over_extents);
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// Finds all deflate locations in |deflates| that are inside an Extent in
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// |extents|. This function should not change the order of deflates.
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std::vector<puffin::BitExtent> FindDeflates(
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const std::vector<Extent>& extents,
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const std::vector<puffin::BitExtent>& deflates);
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// Creates a new list of deflate locations (|out_deflates|) from |in_deflates|
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// by assuming all extents in the |extents| have been put together
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// linearly. This function assumes that all deflate locations given in
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// |in_deflates| are located somewhere in the |extents|. |out_deflates| should
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// be empty on call.
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//
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// |extents|:
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// | ----------------------- ------ --------------
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// |in_deflates|:
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// | ======== ==== ==== ======
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// |out_deflates|:
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// | ======== ==== ==== ======
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//
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bool CompactDeflates(const std::vector<Extent>& extents,
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const std::vector<puffin::BitExtent>& in_deflates,
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std::vector<puffin::BitExtent>* out_deflates);
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// Combines |FindDeflates| and |CompcatDeflates| for ease of use.
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bool FindAndCompactDeflates(const std::vector<Extent>& extents,
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const std::vector<puffin::BitExtent>& in_deflates,
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std::vector<puffin::BitExtent>* out_deflates);
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// Expands a BitExtents to a ByteExtent.
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puffin::ByteExtent ExpandToByteExtent(const puffin::BitExtent& extent);
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} // namespace deflate_utils
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} // namespace chromeos_update_engine
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#endif // UPDATE_ENGINE_PAYLOAD_GENERATOR_DEFLATE_UTILS_H_
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