/kde/autobuild/kdebase/konsole/konsole/BlockArray.h

/*
    This file is part of Konsole, an X terminal.
    Copyright (C) 2000 by Stephan Kulow <coolo@kde.org>

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program 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 General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
    02110-1301  USA.
*/

#ifndef BLOCKARRAY_H
#define BLOCKARRAY_H

#include <unistd.h>

//#error Dont use in KDE 2.1

#define BlockSize (1 << 12)
#define ENTRIES   ((BlockSize - sizeof(size_t) ) / sizeof(unsigned char))

struct Block {
    Block() { size = 0; }
    unsigned char data[ENTRIES];
    size_t size;
};

// ///////////////////////////////////////////////////////

class BlockArray {
public:
    BlockArray();

    ~BlockArray();

    size_t append(Block *block);

    const Block *at(size_t index);

    bool setHistorySize(size_t newsize);

    size_t newBlock();

    Block *lastBlock() const;

    bool setSize(size_t newsize);

    size_t len() const { return length; }

    bool has(size_t index) const;

    size_t getCurrent() const { return current; }

private:
    void unmap();
    void increaseBuffer();
    void decreaseBuffer(size_t newsize);

    size_t size;
    // current always shows to the last inserted block
    size_t current;
    size_t index;

    Block *lastmap;
    size_t lastmap_index;
    Block *lastblock;

    int ion;
    size_t length;

};


#endif

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