86 lines
2.6 KiB
C++
86 lines
2.6 KiB
C++
//
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// Copyright (C) 2020 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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#pragma once
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#include <optional>
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#include <vector>
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#include <android-base/file.h>
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#include <libsnapshot/cow_reader.h>
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#include <payload_consumer/file_descriptor.h>
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namespace android {
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namespace snapshot {
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class ReadOnlyFileDescriptor : public chromeos_update_engine::FileDescriptor {
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public:
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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 Write(const void* buf, size_t count) override;
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bool BlkIoctl(int request, uint64_t start, uint64_t length, int* result) override;
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};
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class ReadFdFileDescriptor : public ReadOnlyFileDescriptor {
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public:
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explicit ReadFdFileDescriptor(android::base::unique_fd&& fd);
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ssize_t Read(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 Close() override;
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bool IsSettingErrno() override;
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bool IsOpen() override;
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bool Flush() override;
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private:
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android::base::unique_fd fd_;
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};
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class CompressedSnapshotReader : public ReadOnlyFileDescriptor {
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public:
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bool SetCow(std::unique_ptr<CowReader>&& cow);
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void SetSourceDevice(const std::string& source_device);
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void SetBlockDeviceSize(uint64_t block_device_size);
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ssize_t Read(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 Close() override;
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bool IsSettingErrno() override;
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bool IsOpen() override;
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bool Flush() override;
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private:
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ssize_t ReadBlock(uint64_t chunk, IByteSink* sink, size_t start_offset,
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const std::optional<uint64_t>& max_bytes = {});
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android::base::borrowed_fd GetSourceFd();
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std::unique_ptr<CowReader> cow_;
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std::unique_ptr<ICowOpIter> op_iter_;
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uint32_t block_size_ = 0;
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std::optional<std::string> source_device_;
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android::base::unique_fd source_fd_;
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uint64_t block_device_size_ = 0;
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off64_t offset_ = 0;
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std::vector<const CowOperation*> ops_;
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};
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} // namespace snapshot
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} // namespace android
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