C++ QTextCodec::aliases方法代码示例

void TextCodecQt::registerEncodingNames(EncodingNameRegistrar registrar)
{
    QList<int> mibs = QTextCodec::availableMibs();
//     qDebug() << ">>>>>>>>> registerEncodingNames";

    for (int i = 0; i < mibs.size(); ++i) {
        QTextCodec *c = QTextCodec::codecForMib(mibs.at(i));
        const char *name = getAtomicName(c->name());
        registrar(name, name);
//         qDebug() << "    " << name << name;
        QList<QByteArray> aliases = c->aliases();
        for (int i = 0; i < aliases.size(); ++i) {
            const char *a = getAtomicName(aliases.at(i));
//             qDebug() << "     (a) " << a << name;
            registrar(a, name);
        }
    }
}

QTextCodec* QTextCodec::codecForName(const char *name)
{
    if (name == 0 || *name == 0)
        return 0;

    setup();

    for (std::vector<QTextCodec*>::iterator i = all->begin(); i != all->end(); i++) {
        QTextCodec *cursor = *i;
        if (nameMatch(cursor->name(), name))
            return cursor;
        const Aliase* aliases = cursor->aliases();
        for (int i = 0; aliases[i]; ++i)
            if (nameMatch(aliases[i], name))
                return cursor;
    }

    return 0;
}

/*!
    Searches all installed QTextCodec objects and returns the one
    which best matches \a name; the match is case-insensitive. Returns
    0 if no codec matching the name \a name could be found.
*/
QTextCodec *QTextCodec::codecForName(const QByteArray &name)
{
    if (name.isEmpty())
        return 0;

    setup();

    for (int i = 0; i < all->size(); ++i) {
        QTextCodec *cursor = all->at(i);
        if (nameMatch(cursor->name(), name))
            return cursor;
        QList<QByteArray> aliases = cursor->aliases();
        for (int i = 0; i < aliases.size(); ++i)
            if (nameMatch(aliases.at(i), name))
                return cursor;
    }

    return createForName(name);
}

/*!
    \threadsafe
    Searches all installed QTextCodec objects and returns the one
    which best matches \a name; the match is case-insensitive. Returns
    0 if no codec matching the name \a name could be found.
*/
QTextCodec *QTextCodec::codecForName(const QByteArray &name)
{
    if (name.isEmpty())
        return 0;

    QMutexLocker locker(textCodecsMutex());

    QCoreGlobalData *globalData = QCoreGlobalData::instance();
    if (!globalData)
        return 0;
    setup();

#ifndef QT_USE_ICU
    QTextCodecCache *cache = &globalData->codecCache;
    QTextCodec *codec;
    if (cache) {
        codec = cache->value(name);
        if (codec)
            return codec;
    }

    for (TextCodecListConstIt it = globalData->allCodecs.constBegin(), cend = globalData->allCodecs.constEnd(); it != cend; ++it) {
        QTextCodec *cursor = *it;
        if (qTextCodecNameMatch(cursor->name(), name)) {
            if (cache)
                cache->insert(name, cursor);
            return cursor;
        }
        QList<QByteArray> aliases = cursor->aliases();
        for (ByteArrayListConstIt ait = aliases.constBegin(), acend = aliases.constEnd(); ait != acend; ++ait) {
            if (qTextCodecNameMatch(*ait, name)) {
                if (cache)
                    cache->insert(name, cursor);
                return cursor;
            }
        }
    }

    return 0;
#else
    return QIcuCodec::codecForNameUnlocked(name);
#endif
}

/*!
    \threadsafe
    Searches all installed QTextCodec objects and returns the one
    which best matches \a name; the match is case-insensitive. Returns
    0 if no codec matching the name \a name could be found.
*/
QTextCodec *QTextCodec::codecForName(const QByteArray &name)
{
    if (name.isEmpty())
        return 0;

    QMutexLocker locker(textCodecsMutex());

    QCoreGlobalData *globalData = QCoreGlobalData::instance();
    if (!globalData)
        return 0;
        setup();

#ifndef QT_USE_ICU
    QTextCodecCache *cache = &globalData->codecCache;
    QTextCodec *codec;
    if (cache) {
        codec = cache->value(name);
        if (codec)
            return codec;
    }

    for (int i = 0; i < globalData->allCodecs.size(); ++i) {
        QTextCodec *cursor = globalData->allCodecs.at(i);
        if (qTextCodecNameMatch(cursor->name(), name)) {
            if (cache)
                cache->insert(name, cursor);
            return cursor;
        }
        QList<QByteArray> aliases = cursor->aliases();
        for (int y = 0; y < aliases.size(); ++y)
            if (qTextCodecNameMatch(aliases.at(y), name)) {
                if (cache)
                    cache->insert(name, cursor);
                return cursor;
            }
    }

    return 0;
#else
    return QIcuCodec::codecForNameUnlocked(name);
#endif
}

/*!
    Searches all installed QTextCodec objects and returns the one
    which best matches \a name; the match is case-insensitive. Returns
    0 if no codec matching the name \a name could be found.
*/
QTextCodec *QTextCodec::codecForName(const QByteArray &name)
{
    if (name.isEmpty())
        return 0;

    QMutexLocker locker(textCodecsMutex());
    setup();

    if (!validCodecs())
        return 0;

    QTextCodecCache *cache = qTextCodecCache();
    QTextCodec *codec;
    if (cache) {
        codec = cache->value(name);
        if (codec)
            return codec;
    }

    for (int i = 0; i < all->size(); ++i) {
        QTextCodec *cursor = all->at(i);
        if (nameMatch(cursor->name(), name)) {
            if (cache)
                cache->insert(name, cursor);
            return cursor;
        }
        QList<QByteArray> aliases = cursor->aliases();
        for (int y = 0; y < aliases.size(); ++y)
            if (nameMatch(aliases.at(y), name)) {
                if (cache)
                    cache->insert(name, cursor);
                return cursor;
            }
    }

    codec = createForName(name);
    if (codec && cache)
        cache->insert(name, codec);
    return codec;
}

QTextCodec *QIcuCodec::codecForNameUnlocked(const char *name)
{
    // backwards compatibility with Qt 4.x
    if (!qstrcmp(name, "CP949"))
        name = "windows-949";
    // these are broken data in ICU 4.4, and can't be resolved even though they are aliases to tis-620
    if (!qstrcmp(name, "windows-874-2000")
        || !qstrcmp(name, "windows-874")
        || !qstrcmp(name, "MS874")
        || !qstrcmp(name, "x-windows-874")
        || !qstrcmp(name, "ISO 8859-11"))
        name = "TIS-620";

    UErrorCode error = U_ZERO_ERROR;
    // MIME gives better default names
    const char *standardName = ucnv_getStandardName(name, "MIME", &error);
    if (U_FAILURE(error) || !standardName) {
        error = U_ZERO_ERROR;
        standardName = ucnv_getStandardName(name, "IANA", &error);
    }
    bool qt_only = false;
    if (U_FAILURE(error) || !standardName) {
        standardName = name;
        qt_only = true;
    } else {
        // correct some issues where the ICU data set contains duplicated entries.
        // Where this happens it's because one data set is a subset of another. We
        // always use the larger data set.

        if (qstrcmp(standardName, "GB2312") == 0 || qstrcmp(standardName, "GB_2312-80") == 0)
            standardName = "GBK";
        else if (qstrcmp(standardName, "KSC_5601") == 0 || qstrcmp(standardName, "EUC-KR") == 0 || qstrcmp(standardName, "cp1363") == 0)
            standardName = "windows-949";
    }

    QCoreGlobalData *globalData = QCoreGlobalData::instance();
    QTextCodecCache *cache = &globalData->codecCache;

    QTextCodec *codec;
    if (cache) {
        codec = cache->value(standardName);
        if (codec)
            return codec;
    }

    for (int i = 0; i < globalData->allCodecs.size(); ++i) {
        QTextCodec *cursor = globalData->allCodecs.at(i);
        if (qTextCodecNameMatch(cursor->name(), standardName)) {
            if (cache)
                cache->insert(standardName, cursor);
            return cursor;
        }
        QList<QByteArray> aliases = cursor->aliases();
        for (int y = 0; y < aliases.size(); ++y)
            if (qTextCodecNameMatch(aliases.at(y), standardName)) {
                if (cache)
                    cache->insert(standardName, cursor);
                return cursor;
            }
    }

    QTextCodec *c = loadQtCodec(standardName);
    if (c)
        return c;

    if (qt_only)
        return 0;

    // check whether there is really a converter for the name available.
    UConverter *conv = ucnv_open(standardName, &error);
    if (!conv) {
        qDebug() << "codecForName: ucnv_open failed" << standardName << u_errorName(error);
        return 0;
    }
    //qDebug() << "QIcuCodec: Standard name for " << name << "is" << standardName;
    ucnv_close(conv);


    c = new QIcuCodec(standardName);
    if (cache)
        cache->insert(standardName, c);
    return c;
}