static BOOL sortkey_get_extra_weights(struct sortkey_data* data, int flags, WCHAR c)
{
    struct character_info info;

    if (!sortkey_get_char(data, &info, c))
    {
        return FALSE;
    }

    if (info.script_member == SORTKEY_JAPANESE)
    {
        if (info.weight_primary <= 1)
        {
            /* TODO */
        }
        else
        {
            const BYTE BASELINE_EXTRA = 0xc4;
            const BYTE ISOLATE_KANA = 0x20 | BASELINE_EXTRA; /* if bit is set then hiragana, else katakana */
            const BYTE ISOLATE_SMALL = 0x2 | BASELINE_EXTRA; /* if bit is set then normal kana, else small kana */
            const BYTE ISOLATE_WIDTH = 0x1 | BASELINE_EXTRA; /* if bit is set then full width, else half width */
            int weight_case = info.weight_case | BASELINE_EXTRA;

            BYTE flag_small = (BYTE)(weight_case & ISOLATE_SMALL);
            BYTE flag_kana = (BYTE)(weight_case & ISOLATE_KANA);
            BYTE flag_width = (BYTE)(weight_case & ISOLATE_WIDTH);

            if (flags & NORM_IGNOREKANATYPE)
                flag_kana = BASELINE_EXTRA;
            if (flags & NORM_IGNOREWIDTH)
                flag_width = BASELINE_EXTRA;

            if ((NORM_IGNORENONSPACE & flags) == 0)
            {
                sortkey_add_weight(data, flag_small);
            }
            sortkey_add_weight(data, flag_kana);
            sortkey_add_weight(data, flag_width);
        }
    }
    return TRUE;
}