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//
// Copyright (C) 2020 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.
//
#ifndef UPDATE_ENGINE_SNAPSHOT_EXTENT_WRITER_H_
#define UPDATE_ENGINE_SNAPSHOT_EXTENT_WRITER_H_
#include <cstdint>
#include <vector>
#include <libsnapshot/cow_writer.h>
#include "update_engine/payload_consumer/extent_writer.h"
#include "update_engine/update_metadata.pb.h"
namespace chromeos_update_engine {
class SnapshotExtentWriter : public chromeos_update_engine::ExtentWriter {
public:
explicit SnapshotExtentWriter(android::snapshot::ICowWriter* cow_writer);
~SnapshotExtentWriter();
// Returns true on success.
bool Init(const google::protobuf::RepeatedPtrField<Extent>& extents,
uint32_t block_size) override;
// Returns true on success.
// This will construct a COW_REPLACE operation and forward it to CowWriter. It
// is important that caller does not perform SOURCE_COPY operation on this
// class, otherwise raw data will be stored. Caller should find ways to use
// COW_COPY whenever possible.
bool Write(const void* bytes, size_t count) override;
private:
bool next_extent();
[[nodiscard]] size_t ConsumeWithBuffer(const uint8_t* bytes, size_t count);
// It's a non-owning pointer, because PartitionWriter owns the CowWruter. This
// allows us to use a single instance of CowWriter for all operations applied
// to the same partition.
android::snapshot::ICowWriter* cow_writer_;
google::protobuf::RepeatedPtrField<Extent> extents_;
size_t cur_extent_idx_;
std::vector<uint8_t> buffer_;
size_t block_size_;
};
} // namespace chromeos_update_engine
#endif
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