scheme.h

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// -*- mode: c++; tab-width: 4; indent-tabs-mode: t; c-file-style: "stroustrup"; -*-
// vi:set ts=4 sts=4 sw=4 noet :
// Copyright 2013, The TPIE development team
//
// This file is part of TPIE.
//
// TPIE is free software: you can redistribute it and/or modify it under
// the terms of the GNU Lesser General Public License as published by the
// Free Software Foundation, either version 3 of the License, or (at your
// option) any later version.
//
// TPIE is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
// License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with TPIE.  If not, see <http://www.gnu.org/licenses/>

#ifndef TPIE_COMPRESSED_SCHEME_H
#define TPIE_COMPRESSED_SCHEME_H


namespace tpie {

enum compression_flags {
    compression_none = 0,
    compression_normal = 1,
    compression_all = 2
};

class compression_scheme {
public:
    enum type {
        none = 0,
        snappy = 1
    };

    virtual size_t max_compressed_length(size_t srcSize) const = 0;

    virtual void compress(char * dest, const char * src, size_t srcSize, size_t * destSize) const = 0;

    virtual size_t uncompressed_length(const char * src, size_t srcSize) const = 0;

    virtual void uncompress(char * dest, const char * src, size_t srcSize) const = 0;

protected:
    ~compression_scheme() {}
};

const compression_scheme & get_compression_scheme_none();
const compression_scheme & get_compression_scheme_snappy();

inline const compression_scheme & get_compression_scheme(compression_scheme::type t) {
    switch (t) {
        case compression_scheme::none:
            return get_compression_scheme_none();
        case compression_scheme::snappy:
            return get_compression_scheme_snappy();
    }
    return get_compression_scheme_none();
}

}

#endif // TPIE_COMPRESSED_SCHEME_H