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Diffstat (limited to 'src/compressor/Compressor.h')
-rw-r--r-- | src/compressor/Compressor.h | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/src/compressor/Compressor.h b/src/compressor/Compressor.h new file mode 100644 index 00000000..a696521a --- /dev/null +++ b/src/compressor/Compressor.h @@ -0,0 +1,106 @@ +// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- +// vim: ts=8 sw=2 smarttab +/* + * Ceph - scalable distributed file system + * + * Copyright (C) 2015 Haomai Wang <haomaiwang@gmail.com> + * + * This is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License version 2.1, as published by the Free Software + * Foundation. See file COPYING. + * + */ + +#ifndef CEPH_COMPRESSOR_H +#define CEPH_COMPRESSOR_H + +#include <memory> +#include <string> +#include <string_view> +#include <boost/optional.hpp> +#include "include/ceph_assert.h" // boost clobbers this +#include "include/buffer.h" +#include "include/int_types.h" +#ifdef HAVE_QATZIP + #include "QatAccel.h" +#endif + +class Compressor; +typedef std::shared_ptr<Compressor> CompressorRef; +class CephContext; + +class Compressor { +public: + enum CompressionAlgorithm { + COMP_ALG_NONE = 0, + COMP_ALG_SNAPPY = 1, + COMP_ALG_ZLIB = 2, + COMP_ALG_ZSTD = 3, +#ifdef HAVE_LZ4 + COMP_ALG_LZ4 = 4, +#endif +#ifdef HAVE_BROTLI + COMP_ALG_BROTLI = 5, +#endif + COMP_ALG_LAST //the last value for range checks + }; + + using pair_type = std::pair<const char*, CompressionAlgorithm>; + static constexpr std::initializer_list<pair_type> compression_algorithms { + { "none", COMP_ALG_NONE }, + { "snappy", COMP_ALG_SNAPPY }, + { "zlib", COMP_ALG_ZLIB }, + { "zstd", COMP_ALG_ZSTD }, +#ifdef HAVE_LZ4 + { "lz4", COMP_ALG_LZ4 }, +#endif +#ifdef HAVE_BROTLI + { "brotli", COMP_ALG_BROTLI }, +#endif + }; + + // compression options + enum CompressionMode { + COMP_NONE, ///< compress never + COMP_PASSIVE, ///< compress if hinted COMPRESSIBLE + COMP_AGGRESSIVE, ///< compress unless hinted INCOMPRESSIBLE + COMP_FORCE ///< compress always + }; + +#ifdef HAVE_QATZIP + bool qat_enabled; + QatAccel qat_accel; +#endif + + static const char* get_comp_alg_name(int a); + static boost::optional<CompressionAlgorithm> get_comp_alg_type(const std::string &s); + + static const char *get_comp_mode_name(int m); + static boost::optional<CompressionMode> get_comp_mode_type(const std::string &s); + + Compressor(CompressionAlgorithm a, const char* t) : alg(a), type(t) { + } + virtual ~Compressor() {} + const std::string& get_type_name() const { + return type; + } + CompressionAlgorithm get_type() const { + return alg; + } + virtual int compress(const ceph::bufferlist &in, ceph::bufferlist &out) = 0; + virtual int decompress(const ceph::bufferlist &in, ceph::bufferlist &out) = 0; + // this is a bit weird but we need non-const iterator to be in + // alignment with decode methods + virtual int decompress(ceph::bufferlist::const_iterator &p, size_t compressed_len, ceph::bufferlist &out) = 0; + + static CompressorRef create(CephContext *cct, const std::string &type); + static CompressorRef create(CephContext *cct, int alg); + +protected: + CompressionAlgorithm alg; + std::string type; + +}; + +#endif |