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// -*- 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
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