//
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// Copyright (C) 2017 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_FEC_FILE_DESCRIPTOR_H_
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#define UPDATE_ENGINE_PAYLOAD_CONSUMER_FEC_FILE_DESCRIPTOR_H_
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#include <fec/io.h>
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#include "update_engine/payload_consumer/file_descriptor.h"
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// A FileDescriptor implementation with error correction based on the "libfec"
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// library. The libfec on the running system allows to parse the error
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// correction blocks stored in partitions that have verity and error correction
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// enabled. This information is present in the raw block device, but of course
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// not available via the dm-verity block device.
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namespace chromeos_update_engine {
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// An error corrected file based on FEC.
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class FecFileDescriptor : public FileDescriptor {
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public:
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FecFileDescriptor() = default;
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~FecFileDescriptor() = default;
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// Interface methods.
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bool Open(const char* path, int flags, mode_t mode) override;
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bool Open(const char* path, int flags) override;
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ssize_t Read(void* buf, size_t count) override;
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ssize_t Write(const void* buf, size_t count) override;
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off64_t Seek(off64_t offset, int whence) override;
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uint64_t BlockDevSize() override;
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bool BlkIoctl(int request,
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uint64_t start,
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uint64_t length,
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int* result) override;
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bool Flush() override { return true; }
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bool Close() override;
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bool IsSettingErrno() override { return true; }
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bool IsOpen() override {
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// The bool operator on the fec::io class tells whether the internal
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// handle is open.
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return static_cast<bool>(fh_);
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}
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protected:
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fec::io fh_;
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uint64_t dev_size_{0};
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};
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} // namespace chromeos_update_engine
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#endif // UPDATE_ENGINE_PAYLOAD_CONSUMER_FEC_FILE_DESCRIPTOR_H_
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