keyuni.cpp

/***************************************************************************
 *   Copyright (C) 2012~2013 by CSSlayer                                   *
 *                                                                         *
 *   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.,                                       *
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 ***************************************************************************/

#include <stdint.h>
#include "keyuni.h"
#include "keydata.h"

uint32_t
FcitxKeySymToUnicode (uint32_t keyval)
{
    int min = 0;
    int max = sizeof (gdk_keysym_to_unicode_tab) / sizeof(gdk_keysym_to_unicode_tab[0]) - 1;
    int mid;

    /* First check for Latin-1 characters (1:1 mapping) */
    if ((keyval >= 0x0020 && keyval <= 0x007e) ||
            (keyval >= 0x00a0 && keyval <= 0x00ff))
        return keyval;

    /* Also check for directly encoded 24-bit UCS characters:
    */
    if ((keyval & 0xff000000) == 0x01000000)
        return keyval & 0x00ffffff;

    /* binary search in table */
    while (max >= min) {
        mid = (min + max) / 2;
        if (gdk_keysym_to_unicode_tab[mid].keysym < keyval)
            min = mid + 1;
        else if (gdk_keysym_to_unicode_tab[mid].keysym > keyval)
            max = mid - 1;
        else {
            /* found it */
            return gdk_keysym_to_unicode_tab[mid].ucs;
        }
    }

    /* No matching Unicode value found */
    return 0;
}