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120 lines
2.9 KiB
120 lines
2.9 KiB
15 years ago
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/*
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This file is part of Konsole, an X terminal.
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Copyright (C) 2000 by Stephan Kulow <coolo@kde.org>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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*/
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#ifndef BLOCKARRAY_H
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#define BLOCKARRAY_H
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#include <unistd.h>
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//#error Dont use in KDE 2.1
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#define BlockSize (1 << 12)
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#define ENTRIES ((BlockSize - sizeof(size_t) ) / sizeof(unsigned char))
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struct Block {
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Block() { size = 0; }
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unsigned char data[ENTRIES];
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size_t size;
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};
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// ///////////////////////////////////////////////////////
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class BlockArray {
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public:
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/**
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* Creates a history file for holding
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* maximal size blocks. If more blocks
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* are requested, then it drops earlier
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* added ones.
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*/
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BlockArray();
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/// destructor
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~BlockArray();
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/**
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* adds the Block at the end of history.
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* This may drop other blocks.
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*
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* The ownership on the block is transfered.
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* An unique index number is returned for accessing
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* it later (if not yet droped then)
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*
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* Note, that the block may be dropped completely
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* if history is turned off.
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*/
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size_t append(Block *block);
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/**
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* gets the block at the index. Function may return
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* 0 if the block isn't available any more.
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*
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* The returned block is strictly readonly as only
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* maped in memory - and will be invalid on the next
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* operation on this class.
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*/
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const Block *at(size_t index);
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/**
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* reorders blocks as needed. If newsize is null,
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* the history is emptied completely. The indices
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* returned on append won't change their semantic,
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* but they may not be valid after this call.
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*/
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bool setHistorySize(size_t newsize);
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size_t newBlock();
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Block *lastBlock() const;
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/**
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* Convenient function to set the size in KBytes
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* instead of blocks
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*/
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bool setSize(size_t newsize);
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size_t len() const { return length; }
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bool has(size_t index) const;
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size_t getCurrent() const { return current; }
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private:
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void unmap();
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void increaseBuffer();
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void decreaseBuffer(size_t newsize);
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size_t size;
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// current always shows to the last inserted block
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size_t current;
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size_t index;
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Block *lastmap;
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size_t lastmap_index;
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Block *lastblock;
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int ion;
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size_t length;
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};
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#endif
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