utf8scsu.cpp

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/******************************************************************************
 *
 *  utf8scsu.cpp -  SWFilter descendant to convert UTF-8 to SCSU
 *
 * $Id: utf8scsu.cpp 3618 2019-04-14 22:30:32Z scribe $
 *
 * Copyright 2001-2014 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.
 *
 */

#ifdef _ICU_

#include <utf8scsu.h>
#include <swbuf.h>

SWORD_NAMESPACE_START


UTF8SCSU::UTF8SCSU() {
    // initialize SCSU converter
    scsuConv = ucnv_open("SCSU", &err);

    // initialize UTF-8 converter
    utf8Conv = ucnv_open("UTF-8", &err);
}

UTF8SCSU::~UTF8SCSU() {
         ucnv_close(scsuConv);
         ucnv_close(utf8Conv);
}

char UTF8SCSU::processText(SWBuf &text, const SWKey *key, const SWModule *module) {
    if ((unsigned long)key < 2) // hack, we're en(1)/de(0)ciphering
        return -1;

    err = U_ZERO_ERROR;
    icu::UnicodeString utf16Text(text.getRawData(), text.length(), utf8Conv, err);
    err = U_ZERO_ERROR;
    int32_t len = utf16Text.extract(text.getRawData(), text.size(), scsuConv, err);
    if (len > (int32_t)text.size()+1) {
        text.setSize(len+1);
        utf16Text.extract(text.getRawData(), text.size(), scsuConv, err);
    }

    return 0;
}

SWORD_NAMESPACE_END
#endif