utf8utf16.cpp

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/******************************************************************************
 *
 *  utf8utf16.cpp - SWFilter descendant to convert UTF-8 to UTF-16
 *
 * $Id: utf8utf16.cpp 3749 2020-07-06 23:51:56Z scribe $
 *
 * Copyright 2001-2013 CrossWire Bible Society (http://www.crosswire.org)
 *  CrossWire Bible Society
 *  P. O. Box 2528
 *  Tempe, AZ  85280-2528
 *
 * 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 version 2.
 *
 * 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.
 *
 */


#include <utf8utf16.h>
#include <utilstr.h>
#include <swbuf.h>


SWORD_NAMESPACE_START


UTF8UTF16::UTF8UTF16() {
}


char UTF8UTF16::processText(SWBuf &text, const SWKey *key, const SWModule *module) {
    const unsigned char *from;
    SWBuf orig = text;

    from = (const unsigned char *)orig.c_str();

    // -------------------------------
    text = "";
    while (*from) {

        SW_u32 ch = getUniCharFromUTF8(&from);

        if (!ch) continue;  // invalid char

        if (ch < 0x10000) {
            text.setSize(text.size()+2);
            *((SW_u16 *)(text.getRawData() + (text.size() - 2))) = (SW_u16)ch;
        }
        else {
            SW_u16 utf16;
            utf16 = (SW_s16)((ch - 0x10000) / 0x400 + 0xD800);
            text.setSize(text.size()+4);
            *((SW_u16 *)(text.getRawData() + (text.size() - 4))) = utf16;
            utf16 = (SW_s16)((ch - 0x10000) % 0x400 + 0xDC00);
            *((SW_u16 *)(text.getRawData() + (text.size() - 2))) = utf16;
        }
    }
    text.setSize(text.size()+2);
    *((SW_u16 *)(text.getRawData() + (text.size() - 2))) = (SW_u16)0;
    text.setSize(text.size()-2);
       
    return 0;
}

SWORD_NAMESPACE_END