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//
// Copyright (C) 2009 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_EXTENT_WRITER_H_
#define UPDATE_ENGINE_PAYLOAD_CONSUMER_EXTENT_WRITER_H_
#include <memory>
#include <utility>
#include <base/logging.h>
#include <brillo/secure_blob.h>
#include "update_engine/common/utils.h"
#include "update_engine/payload_consumer/file_descriptor.h"
#include "update_engine/update_metadata.pb.h"
// ExtentWriter is an abstract class which synchronously writes to a given
// file descriptor at the extents given.
namespace chromeos_update_engine {
class ExtentWriter {
public:
ExtentWriter() = default;
virtual ~ExtentWriter() = default;
// Returns true on success.
virtual bool Init(const google::protobuf::RepeatedPtrField<Extent>& extents,
uint32_t block_size) = 0;
// Returns true on success.
virtual bool Write(const void* bytes, size_t count) = 0;
};
// DirectExtentWriter is probably the simplest ExtentWriter implementation.
// It writes the data directly into the extents.
class DirectExtentWriter : public ExtentWriter {
public:
explicit DirectExtentWriter(FileDescriptorPtr fd) : fd_(fd) {}
~DirectExtentWriter() override = default;
bool Init(const google::protobuf::RepeatedPtrField<Extent>& extents,
uint32_t block_size) override {
block_size_ = block_size;
extents_ = extents;
cur_extent_ = extents_.begin();
return true;
}
bool Write(const void* bytes, size_t count) override;
private:
FileDescriptorPtr fd_{nullptr};
size_t block_size_{0};
// Bytes written into |cur_extent_| thus far.
uint64_t extent_bytes_written_{0};
google::protobuf::RepeatedPtrField<Extent> extents_;
// The next call to write should correspond to |cur_extents_|.
google::protobuf::RepeatedPtrField<Extent>::iterator cur_extent_;
};
} // namespace chromeos_update_engine
#endif // UPDATE_ENGINE_PAYLOAD_CONSUMER_EXTENT_WRITER_H_
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