    /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
    /*
     * This file is part of the LibreOffice project.
     *
     * This Source Code Form is subject to the terms of the Mozilla Public
     * License, v. 2.0. If a copy of the MPL was not distributed with this
     * file, You can obtain one at http://mozilla.org/MPL/2.0/.
     *
     * This file incorporates work covered by the following license notice:
     *
     *   Licensed to the Apache Software Foundation (ASF) under one or more
     *   contributor license agreements. See the NOTICE file distributed
     *   with this work for additional information regarding copyright
     *   ownership. The ASF licenses this file to you under the Apache
     *   License, Version 2.0 (the "License"); you may not use this file
     *   except in compliance with the License. You may obtain a copy of
     *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
     */

    #include <assert.h>
    #include <textconversion.hxx>
    #include <com/sun/star/i18n/TextConversionType.hpp>
    #include <com/sun/star/i18n/TextConversionOption.hpp>
    #include <com/sun/star/lang/NoSupportException.hpp>
    #include <com/sun/star/linguistic2/ConversionDirection.hpp>
    #include <com/sun/star/linguistic2/ConversionDictionaryType.hpp>
    #include <com/sun/star/linguistic2/ConversionDictionaryList.hpp>
    #include <rtl/ustrbuf.hxx>
    #include <unicode/uchar.h>
    #include <memory>

    using namespace com::sun::star::lang;
    using namespace com::sun::star::i18n;
    using namespace com::sun::star::linguistic2;
    using namespace com::sun::star::uno;

    namespace i18npool {

    #define SCRIPT_OTHERS   0
    #define SCRIPT_HANJA    1
    #define SCRIPT_HANGUL   2

    TextConversion_ko::TextConversion_ko( const Reference < XComponentContext >& xContext )
        : TextConversionService("com.sun.star.i18n.TextConversion_ko")
    {
        Reference < XInterface > xI;

        xI = xContext->getServiceManager()->createInstanceWithContext(
            "com.sun.star.i18n.ConversionDictionary_ko", xContext);

        if ( xI.is() )
            xCD.set( xI, UNO_QUERY );

        xCDL = ConversionDictionaryList::create(xContext);

        maxLeftLength = maxRightLength = 1;

        // get maximum length of word in dictionary
        if (xCDL.is()) {
            Locale loc("ko", "KR", OUString());
            maxLeftLength = xCDL->queryMaxCharCount(loc,
                            ConversionDictionaryType::HANGUL_HANJA,
                            ConversionDirection_FROM_LEFT);
            maxRightLength = xCDL->queryMaxCharCount(loc,
                            ConversionDictionaryType::HANGUL_HANJA,
                            ConversionDirection_FROM_RIGHT);
            if (xCD.is()) {
                sal_Int32 tmp = xCD->getMaxCharCount(ConversionDirection_FROM_LEFT);
                if (tmp > maxLeftLength)
                    maxLeftLength = tmp;
                tmp = xCD->getMaxCharCount(ConversionDirection_FROM_RIGHT);
                if (tmp > maxRightLength)
                    maxRightLength = tmp;
            }
        } else if (xCD.is()) {
            maxLeftLength = xCD->getMaxCharCount(ConversionDirection_FROM_LEFT);
            maxRightLength = xCD->getMaxCharCount(ConversionDirection_FROM_RIGHT);
        }
    }

    sal_Int16 checkScriptType(sal_Unicode c)
    {
        typedef struct {
            UBlockCode from;
            UBlockCode to;
            sal_Int16 script;
        } UBlock2Script;

        static const UBlock2Script scriptList[] = {
            {UBLOCK_HANGUL_JAMO, UBLOCK_HANGUL_JAMO, SCRIPT_HANGUL},
            {UBLOCK_CJK_RADICALS_SUPPLEMENT, UBLOCK_BOPOMOFO, SCRIPT_HANJA},
            {UBLOCK_HANGUL_COMPATIBILITY_JAMO, UBLOCK_HANGUL_COMPATIBILITY_JAMO, SCRIPT_HANGUL},
            {UBLOCK_KANBUN, UBLOCK_YI_RADICALS, SCRIPT_HANJA},
            {UBLOCK_HANGUL_SYLLABLES, UBLOCK_HANGUL_SYLLABLES, SCRIPT_HANGUL},
            {UBLOCK_CJK_COMPATIBILITY_IDEOGRAPHS, UBLOCK_CJK_COMPATIBILITY_IDEOGRAPHS, SCRIPT_HANJA},
            {UBLOCK_COMBINING_HALF_MARKS, UBLOCK_SMALL_FORM_VARIANTS, SCRIPT_HANJA},
            {UBLOCK_HALFWIDTH_AND_FULLWIDTH_FORMS, UBLOCK_HALFWIDTH_AND_FULLWIDTH_FORMS, SCRIPT_HANJA},
        };

        UBlockCode block=ublock_getCode(static_cast<sal_uInt32>(c));
        sal_uInt16 i;
        for ( i = 0; i < SAL_N_ELEMENTS(scriptList); i++) {
            if (block <= scriptList[i].to) break;
        }
        return (i < SAL_N_ELEMENTS(scriptList) && block >= scriptList[i].from) ? scriptList[i].script : SCRIPT_OTHERS;
    }

    #ifdef DISABLE_DYNLOADING

    extern "C" {

    const sal_Unicode* getHangul2HanjaData();
    const Hangul_Index* getHangul2HanjaIndex();
    sal_Int16 getHangul2HanjaIndexCount();
    const sal_uInt16* getHanja2HangulIndex();
    const sal_Unicode* getHanja2HangulData();

    }

    #endif

    Sequence< OUString >
    TextConversion_ko::getCharConversions(const OUString& aText, sal_Int32 nStartPos, sal_Int32 nLength, bool toHanja)
    {
        sal_Unicode ch;
        Sequence< OUString > output;
    #ifndef DISABLE_DYNLOADING
        const sal_Unicode* (*getHangul2HanjaData)() = reinterpret_cast<const sal_Unicode* (*)()>(getFunctionBySymbol("getHangul2HanjaData"));
        const Hangul_Index* (*getHangul2HanjaIndex)() = reinterpret_cast<const Hangul_Index* (*)()>(getFunctionBySymbol("getHangul2HanjaIndex"));
        sal_Int16 (*getHangul2HanjaIndexCount)() = reinterpret_cast<sal_Int16 (*)()>(getFunctionBySymbol("getHangul2HanjaIndexCount"));
        const sal_uInt16* (*getHanja2HangulIndex)() = reinterpret_cast<const sal_uInt16* (*)()>(getFunctionBySymbol("getHanja2HangulIndex"));
        const sal_Unicode* (*getHanja2HangulData)() = reinterpret_cast<const sal_Unicode* (*)()>(getFunctionBySymbol("getHanja2HangulData"));
    #else
    #pragma GCC diagnostic push
    #ifdef __clang__
    #pragma GCC diagnostic warning "-Wbool-conversions"
    #else
    #pragma GCC diagnostic warning "-Waddress"
    #endif
    #endif
        if (toHanja && getHangul2HanjaIndex && getHangul2HanjaIndexCount && getHangul2HanjaData) {
            ch = aText[nStartPos];
            const Hangul_Index *Hangul_ko = getHangul2HanjaIndex();
            sal_Int16 top =  getHangul2HanjaIndexCount();
            --top;
            sal_Int16 bottom = 0;

            while (bottom <= top) {
                sal_Int16 current = (top + bottom) / 2;
                sal_Unicode current_ch = Hangul_ko[current].code;
                if (ch < current_ch)
                    top = current - 1;
                else if (ch > current_ch)
                    bottom = current + 1;
                else {
                    const sal_Unicode *ptr = getHangul2HanjaData() + Hangul_ko[current].address;
                    sal_Int16 count = Hangul_ko[current].count;
                    output.realloc(count);
                    for (sal_Int16 i = 0; i < count; i++)
                        output[i] = OUString(ptr + i, 1);
                    break;
                }
            }
        } else if (! toHanja && getHanja2HangulIndex && getHanja2HangulData)
        {
            std::unique_ptr<sal_Unicode[]> newStr(new sal_Unicode[nLength+1]);
            sal_Int32 count = 0;
            while (count < nLength)
            {
                ch = aText[nStartPos + count];
                sal_Unicode address = getHanja2HangulIndex()[ch>>8];
                if (address != 0xFFFF)
                    address = getHanja2HangulData()[address + (ch & 0xFF)];

                if (address != 0xFFFF)
                    newStr[count++] = address;
                else
                    break;
            }
            if (count > 0)
            {
                output.realloc(1);
                output[0] = OUString(newStr.get(), count);
            }
        }
    #if defined(DISABLE_DYNLOADING)
    #pragma GCC diagnostic pop
    #endif
        return output;
    }

    static Sequence< OUString >& operator += (Sequence< OUString > &rSeq1, Sequence< OUString > &rSeq2 )
    {
        if (! rSeq1.hasElements() && rSeq2.hasElements())
            rSeq1 = rSeq2;
        else if (rSeq2.hasElements()) {
            sal_Int32 i, j, k, l;
            k = l = rSeq1.getLength();
            rSeq1.realloc(l + rSeq2.getLength());

            for (i = 0; i < rSeq2.getLength(); i++) {
                for (j = 0; j < l; j++)
                    if (rSeq1[j] == rSeq2[i])
                        break;
                if (j == l)
                    rSeq1[k++] = rSeq2[i];
            }
            if (rSeq1.getLength() > k)
                rSeq1.realloc(k);
        }
        return rSeq1;
    }

    TextConversionResult SAL_CALL
    TextConversion_ko::getConversions( const OUString& aText, sal_Int32 nStartPos, sal_Int32 nLength,
        const Locale& aLocale, sal_Int16 nConversionType, sal_Int32 nConversionOptions)
    {
        TextConversionResult result;
        Sequence <OUString> candidates;
        result.Boundary.startPos = result.Boundary.endPos = 0;

        // do conversion only when there are right conversion type and dictionary services.
        if (nConversionType != TextConversionType::TO_HANGUL &&
            nConversionType != TextConversionType::TO_HANJA)
            throw NoSupportException(); // Conversion type is not supported in this service.
        sal_Int32 start, end, length = aText.getLength() - nStartPos;

        if (length < 0 || nStartPos < 0)
            length = 0;
        else if (length > nLength)
            length = nLength;

        sal_Int16 scriptType = SCRIPT_OTHERS;
        sal_Int32 len = 1;
        bool toHanja = (nConversionType == TextConversionType::TO_HANJA);
        // FROM_LEFT:  Hangul -> Hanja
        // FROM_RIGHT: Hanja  -> Hangul
        ConversionDirection eDirection = toHanja ? ConversionDirection_FROM_LEFT : ConversionDirection_FROM_RIGHT;
        sal_Int32 maxLength = toHanja ? maxLeftLength : maxRightLength;
        if (maxLength == 0) maxLength = 1;

        // search for a max length of convertible text
        for (start = 0, end = 0; start < length; start++) {
            if (end <= start) {
                scriptType = checkScriptType(aText[nStartPos + start]);
                if (nConversionType == TextConversionType::TO_HANJA) {
                    if (scriptType != SCRIPT_HANGUL) // skip non-Hangul characters
                        continue;
                } else {
                    if (scriptType != SCRIPT_HANJA) // skip non-Hanja characters
                        continue;
                }
                end = start + 1;
            }
            if (nConversionOptions & TextConversionOption::CHARACTER_BY_CHARACTER) {
                result.Candidates = getCharConversions(aText, nStartPos + start, len, toHanja); // char2char conversion
            } else {
                for (; end < length && end - start < maxLength; end++)
                    if (checkScriptType(aText[nStartPos + end]) != scriptType)
                        break;

                for (len = end - start; len > 0; len--) {
                    if (len > 1) {
                        try {
                            if (xCDL.is())
                                result.Candidates = xCDL->queryConversions(aText, start + nStartPos, len,
                                    aLocale, ConversionDictionaryType::HANGUL_HANJA, eDirection, nConversionOptions); // user dictionary
                        }
                        catch ( NoSupportException & ) {
                            // clear reference (when there is no user dictionary) in order
                            // to not always have to catch this exception again
                            // in further calls. (save time)
                            xCDL = nullptr;
                        }
                        catch (...) {
                            // catch all other exceptions to allow
                            // querying the system dictionary in the next line
                        }
                        if (xCD.is() && toHanja) { // System dictionary would not do Hanja_to_Hangul conversion.
                            candidates = xCD->getConversions(aText, start + nStartPos, len, eDirection, nConversionOptions);
                            result.Candidates += candidates;
                        }
                    } else if (! toHanja) { // do whole word character 2 character conversion for Hanja to Hangul conversion
                        result.Candidates = getCharConversions(aText, nStartPos + start, length - start, toHanja);
                        if (result.Candidates.hasElements())
                            len = result.Candidates[0].getLength();
                    }
                    if (result.Candidates.hasElements())
                        break;
                }
            }
            // found match
            if (result.Candidates.hasElements()) {
                result.Boundary.startPos = start + nStartPos;
                result.Boundary.endPos = start + len + nStartPos;
                return result;
            }
        }

        return result;
    }

    OUString SAL_CALL
    TextConversion_ko::getConversion( const OUString& aText, sal_Int32 nStartPos, sal_Int32 nLength,
        const Locale& aLocale, sal_Int16 nConversionType, sal_Int32 nConversionOptions)
    {
        sal_Int32 length = aText.getLength() - nStartPos;

        if (length <= 0 || nStartPos < 0)
            return OUString();
        else if (length > nLength)
            length = nLength;

        OUStringBuffer aBuf(length + 1);
        TextConversionResult result;
        const sal_Unicode *str = aText.getStr();

        for (sal_Int32 start = nStartPos; length + nStartPos > start; start = result.Boundary.endPos) {

            result = getConversions(aText, start, length + nStartPos - start, aLocale, nConversionType, nConversionOptions);

            if (result.Boundary.endPos > 0) {
                if (result.Boundary.startPos > start)
                    aBuf.append(str + start, result.Boundary.startPos - start); // append skip portion
                aBuf.append(result.Candidates[0]); // append converted portion
            } else {
                if (length + nStartPos > start)
                    aBuf.append(str + start, length + nStartPos - start); // append last portion
                break;
            }
        }

        return aBuf.makeStringAndClear();
    }

    OUString SAL_CALL
    TextConversion_ko::getConversionWithOffset( const OUString& aText, sal_Int32 nStartPos, sal_Int32 nLength,
        const Locale& rLocale, sal_Int16 nConversionType, sal_Int32 nConversionOptions, Sequence<sal_Int32>& offset)
    {
        offset.realloc(0);
        return getConversion(aText, nStartPos, nLength, rLocale, nConversionType, nConversionOptions);
    }

    sal_Bool SAL_CALL
    TextConversion_ko::interactiveConversion( const Locale& /*rLocale*/, sal_Int16 /*nTextConversionType*/, sal_Int32 /*nTextConversionOptions*/ )
    {
        return true;
    }

    }

    /* vim:set shiftwidth=4 softtabstop=4 expandtab: */

↑ V547 Expression 'length + nStartPos > start' is always true.