mirror of https://gitee.com/bigwinds/arangodb
81 lines
2.3 KiB
C++
81 lines
2.3 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2019 ArangoDB GmbH, Cologne, Germany
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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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/// Copyright holder is ArangoDB GmbH, Cologne, Germany
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///
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/// @author Andrey Abramov
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////////////////////////////////////////////////////////////////////////////////
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#ifndef IRESEARCH_LZ4COMPRESSION_H
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#define IRESEARCH_LZ4COMPRESSION_H
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#include "string.hpp"
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#include "compression.hpp"
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#include "noncopyable.hpp"
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#include <memory>
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NS_ROOT
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NS_BEGIN(compression)
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struct LZ4_stream_deleter {
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void operator()(void* p) NOEXCEPT;
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};
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struct LZ4_streamDecode_deleter {
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void operator()(void* p) NOEXCEPT;
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};
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typedef std::unique_ptr<void, LZ4_stream_deleter> lz4stream;
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typedef std::unique_ptr<void, LZ4_streamDecode_deleter> lz4stream_decode;
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lz4stream lz4_make_stream();
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lz4stream_decode lz4_make_stream_decode();
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struct IRESEARCH_API lz4 {
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DECLARE_COMPRESSION_TYPE();
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class IRESEARCH_API lz4compressor final : public compression::compressor {
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public:
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explicit lz4compressor(int acceleration = 0) NOEXCEPT
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: acceleration_(acceleration) {
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}
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int acceleration() const NOEXCEPT { return acceleration_; }
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virtual bytes_ref compress(byte_type* src, size_t size, bstring& out) override;
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private:
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const int acceleration_{0}; // 0 - default acceleration
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};
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class IRESEARCH_API lz4decompressor final : public compression::decompressor {
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public:
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virtual bytes_ref decompress(byte_type* src, size_t src_size,
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byte_type* dst, size_t dst_size) override;
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};
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static void init();
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static compression::compressor::ptr compressor(const options& opts);
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static compression::decompressor::ptr decompressor();
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}; // lz4basic
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NS_END // compression
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NS_END // NS_ROOT
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#endif
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