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