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//
// Copyright (C) 2018 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_PAYLOAD_CONSUMER_VERITY_WRITER_ANDROID_H_
#define UPDATE_ENGINE_PAYLOAD_CONSUMER_VERITY_WRITER_ANDROID_H_
#include <memory>
#include <string>
#include <verity/hash_tree_builder.h>
#include "payload_consumer/file_descriptor.h"
#include "update_engine/payload_consumer/verity_writer_interface.h"
namespace chromeos_update_engine {
class VerityWriterAndroid : public VerityWriterInterface {
public:
VerityWriterAndroid() = default;
~VerityWriterAndroid() override = default;
bool Init(const InstallPlan::Partition& partition);
bool Update(uint64_t offset, const uint8_t* buffer, size_t size) override;
bool Finalize(FileDescriptorPtr read_fd, FileDescriptorPtr write_fd) override;
// Read [data_offset : data_offset + data_size) from |path| and encode FEC
// data, if |verify_mode|, then compare the encoded FEC with the one in
// |path|, otherwise write the encoded FEC to |path|. We can't encode as we go
// in each Update() like hash tree, because for every rs block, its data are
// spreaded across entire |data_size|, unless we can cache all data in
// memory, we have to re-read them from disk.
static bool EncodeFEC(FileDescriptorPtr read_fd,
FileDescriptorPtr write_fd,
uint64_t data_offset,
uint64_t data_size,
uint64_t fec_offset,
uint64_t fec_size,
uint32_t fec_roots,
uint32_t block_size,
bool verify_mode);
static bool EncodeFEC(const std::string& path,
uint64_t data_offset,
uint64_t data_size,
uint64_t fec_offset,
uint64_t fec_size,
uint32_t fec_roots,
uint32_t block_size,
bool verify_mode);
private:
const InstallPlan::Partition* partition_ = nullptr;
std::unique_ptr<HashTreeBuilder> hash_tree_builder_;
uint64_t total_offset_ = 0;
DISALLOW_COPY_AND_ASSIGN(VerityWriterAndroid);
};
} // namespace chromeos_update_engine
#endif // UPDATE_ENGINE_PAYLOAD_CONSUMER_VERITY_WRITER_ANDROID_H_
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