//
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// Copyright (C) 2018 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_VERITY_WRITER_ANDROID_H_
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#define UPDATE_ENGINE_PAYLOAD_CONSUMER_VERITY_WRITER_ANDROID_H_
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#include <memory>
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#include <string>
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#include <verity/hash_tree_builder.h>
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#include "update_engine/payload_consumer/verity_writer_interface.h"
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namespace chromeos_update_engine {
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class VerityWriterAndroid : public VerityWriterInterface {
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public:
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VerityWriterAndroid() = default;
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~VerityWriterAndroid() override = default;
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bool Init(const InstallPlan::Partition& partition) override;
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bool Update(uint64_t offset, const uint8_t* buffer, size_t size) override;
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// Read [data_offset : data_offset + data_size) from |path| and encode FEC
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// data, if |verify_mode|, then compare the encoded FEC with the one in
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// |path|, otherwise write the encoded FEC to |path|. We can't encode as we go
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// in each Update() like hash tree, because for every rs block, its data are
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// spreaded across entire |data_size|, unless we can cache all data in
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// memory, we have to re-read them from disk.
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static bool EncodeFEC(const std::string& path,
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uint64_t data_offset,
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uint64_t data_size,
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uint64_t fec_offset,
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uint64_t fec_size,
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uint32_t fec_roots,
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uint32_t block_size,
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bool verify_mode);
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private:
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const InstallPlan::Partition* partition_ = nullptr;
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std::unique_ptr<HashTreeBuilder> hash_tree_builder_;
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DISALLOW_COPY_AND_ASSIGN(VerityWriterAndroid);
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};
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} // namespace chromeos_update_engine
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#endif // UPDATE_ENGINE_PAYLOAD_CONSUMER_VERITY_WRITER_ANDROID_H_
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