69 lines
2.5 KiB
C++
69 lines
2.5 KiB
C++
//
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// Copyright (C) 2021 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_CONSUMER_XOR_EXTENT_WRITER_H_
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#define UPDATE_ENGINE_PAYLOAD_CONSUMER_XOR_EXTENT_WRITER_H_
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#include <vector>
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#include "update_engine/payload_consumer/block_extent_writer.h"
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#include "update_engine/payload_consumer/extent_map.h"
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#include "update_engine/payload_consumer/extent_reader.h"
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#include "update_engine/payload_consumer/extent_writer.h"
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#include "update_engine/payload_generator/extent_ranges.h"
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#include "update_engine/payload_generator/extent_utils.h"
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#include <update_engine/update_metadata.pb.h>
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#include <libsnapshot/cow_writer.h>
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namespace chromeos_update_engine {
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// An extent writer that will selectively convert some of the blocks into an XOR
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// block. All blocks that appear in |xor_map| will be converted,
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class XORExtentWriter : public BlockExtentWriter {
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public:
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XORExtentWriter(const InstallOperation& op,
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FileDescriptorPtr source_fd,
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android::snapshot::ICowWriter* cow_writer,
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const ExtentMap<const CowMergeOperation*>& xor_map)
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: src_extents_(op.src_extents()),
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source_fd_(source_fd),
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xor_map_(xor_map),
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cow_writer_(cow_writer) {
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CHECK(source_fd->IsOpen());
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}
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~XORExtentWriter() = default;
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// Returns true on success.
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bool WriteExtent(const void* bytes,
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const Extent& extent,
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size_t size) override;
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private:
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bool WriteReplaceExtents(const std::vector<Extent>& replace_extents,
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const Extent& extent,
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const void* bytes,
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size_t size);
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const google::protobuf::RepeatedPtrField<Extent>& src_extents_;
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const FileDescriptorPtr source_fd_;
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const ExtentMap<const CowMergeOperation*>& xor_map_;
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android::snapshot::ICowWriter* cow_writer_;
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};
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} // namespace chromeos_update_engine
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#endif // UPDATE_ENGINE_PAYLOAD_CONSUMER_XOR_EXTENT_WRITER_H_
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