ExtendedCharTable.h

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/*
    This file is part of Konsole, an X terminal.

    Copyright 2007-2008 by Robert Knight <robertknight@gmail.com>

    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 EXTENDEDCHARTABLE_H
#define EXTENDEDCHARTABLE_H

// Qt
#include <QtCore/QHash>

namespace Konsole
{
class ExtendedCharTable
{
public:
    ExtendedCharTable();
    ~ExtendedCharTable();

    ushort createExtendedChar(const ushort* unicodePoints , ushort length);
    ushort* lookupExtendedChar(ushort hash , ushort& length) const;

    static ExtendedCharTable instance;
private:
    // calculates the hash key of a sequence of unicode points of size 'length'
    ushort extendedCharHash(const ushort* unicodePoints , ushort length) const;
    // tests whether the entry in the table specified by 'hash' matches the
    // character sequence 'unicodePoints' of size 'length'
    bool extendedCharMatch(ushort hash , const ushort* unicodePoints , ushort length) const;
    // internal, maps hash keys to character sequence buffers.  The first ushort
    // in each value is the length of the buffer, followed by the ushorts in the buffer
    // themselves.
    QHash<ushort, ushort*> extendedCharTable;
};
}
#endif  // end of EXTENDEDCHARTABLE_H