RockDbCell.h

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/*
 * Copyright (C) 1996-2018 The Squid Software Foundation and contributors
 *
 * Squid software is distributed under GPLv2+ license and includes
 * contributions from numerous individuals and organizations.
 * Please see the COPYING and CONTRIBUTORS files for details.
 */

#ifndef SQUID_FS_ROCK_DB_CELL_H
#define SQUID_FS_ROCK_DB_CELL_H

#include "store/forward.h"

namespace Rock
{

class DbCellHeader
{
public:
    DbCellHeader();

    bool empty() const { return !firstSlot && !nextSlot && !payloadSize; }

    /* members below are not meaningful if empty() */

    bool sane(const size_t slotSize, int slotLimit) const {
        return
            0 <= firstSlot && firstSlot < slotLimit &&
            -1 <= nextSlot && nextSlot < slotLimit &&
            version > 0 &&
            0 < payloadSize && payloadSize <= slotSize - sizeof(DbCellHeader);
    }

    uint64_t key[2]; 
    uint64_t entrySize; 
    uint32_t payloadSize; 
    uint32_t version;  
    sfileno firstSlot; 
    sfileno nextSlot; 
};

} // namespace Rock

#endif /* SQUID_FS_ROCK_DB_CELL_H */