//
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// Copyright (C) 2015 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_XZ_EXTENT_WRITER_H_
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#define UPDATE_ENGINE_PAYLOAD_CONSUMER_XZ_EXTENT_WRITER_H_
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#include <xz.h>
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#include <memory>
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#include <utility>
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#include <brillo/secure_blob.h>
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#include "update_engine/payload_consumer/extent_writer.h"
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// XzExtentWriter is a concrete ExtentWriter subclass that xz-decompresses
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// what it's given in Write using xz-embedded. Note that xz-embedded only
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// supports files with either no CRC or CRC-32. It passes the decompressed data
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// to an underlying ExtentWriter.
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namespace chromeos_update_engine {
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class XzExtentWriter : public ExtentWriter {
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public:
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explicit XzExtentWriter(std::unique_ptr<ExtentWriter> underlying_writer)
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: underlying_writer_(std::move(underlying_writer)) {}
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~XzExtentWriter() override;
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bool Init(FileDescriptorPtr fd,
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const google::protobuf::RepeatedPtrField<Extent>& extents,
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uint32_t block_size) override;
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bool Write(const void* bytes, size_t count) override;
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private:
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// The underlying ExtentWriter.
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std::unique_ptr<ExtentWriter> underlying_writer_;
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// The opaque xz decompressor struct.
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xz_dec* stream_{nullptr};
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brillo::Blob input_buffer_;
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DISALLOW_COPY_AND_ASSIGN(XzExtentWriter);
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};
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} // namespace chromeos_update_engine
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#endif // UPDATE_ENGINE_PAYLOAD_CONSUMER_XZ_EXTENT_WRITER_H_
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