FileMap.h

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/*
 * Copyright (C) 1996-2023 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.
 */
 
/* DEBUG: section 08    Swap File Bitmap */
 
#ifndef SQUID_SRC_FILEMAP_H
#define SQUID_SRC_FILEMAP_H
 
#include "store/forward.h"
 
class FileMap
{
public:
    FileMap();
    ~FileMap();
 
    bool setBit(sfileno num);
 
    bool testBit(sfileno num) const;
 
    void clearBit(sfileno num);
 
    sfileno allocate(sfileno suggestion);
 
    int capacity() const {return capacity_;}
 
    int numFilesInMap() const {return usedSlots_;}
private:
    void grow();
    FileMap(const FileMap &); //no copying
    FileMap& operator=(const FileMap &); //no assignments
 
    sfileno capacity_;
    unsigned int usedSlots_;
    unsigned int nwords;
    unsigned long *bitmap;
};
 
#endif /* SQUID_SRC_FILEMAP_H */