1 files changed, 273 insertions, 0 deletions
diff --git a/examples/corelib/serialization/convert/datastreamconverter.cpp b/examples/corelib/serialization/convert/datastreamconverter.cpp
new file mode 100644
index 0000000000..7cdb844141
--- /dev/null
+++ b/examples/corelib/serialization/convert/datastreamconverter.cpp
@@ -0,0 +1,273 @@
+/****************************************************************************
+**
+** Copyright (C) 2018 Intel Corporation.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "datastreamconverter.h"
+
+#include <QDataStream>
+#include <QDebug>
+#include <QTextStream>
+
+static const char optionHelp[] =
+        "byteorder=host|big|little      Byte order to use.\n"
+        "version=<n>                    QDataStream version (default: Qt 5.0).\n"
+        ;
+
+static const char signature[] = "qds";
+
+static DataStreamDumper dataStreamDumper;
+static DataStreamConverter DataStreamConverter;
+
+QDataStream &operator<<(QDataStream &ds, const VariantOrderedMap &map)
+{
+    ds << qint64(map.size());
+    for (const auto &pair : map)
+        ds << pair.first << pair.second;
+    return ds;
+}
+
+QDataStream &operator>>(QDataStream &ds, VariantOrderedMap &map)
+{
+    map.clear();
+
+    qint64 size;
+    ds >> size;
+    map.reserve(size);
+
+    while (size-- > 0) {
+        VariantOrderedMap::value_type pair;
+        ds >> pair.first >> pair.second;
+        map.append(pair);
+    }
+
+    return ds;
+}
+
+
+static QString dumpVariant(const QVariant &v, const QString &indent = QLatin1String("\n"))
+{
+    QString result;
+    QString indented = indent + QLatin1String("  ");
+
+    int type = v.userType();
+    if (type == qMetaTypeId<VariantOrderedMap>() || type == QVariant::Map) {
+        const auto map = (type == QVariant::Map) ?
+                    VariantOrderedMap(v.toMap()) : v.value<VariantOrderedMap>();
+
+        result = QLatin1String("Map {");
+        for (const auto &pair : map) {
+            result += indented + dumpVariant(pair.first, indented);
+            result.chop(1);         // remove comma
+            result += QLatin1String(" => ") + dumpVariant(pair.second, indented);
+
+        }
+        result.chop(1);             // remove comma
+        result += indent + QLatin1String("},");
+    } else if (type == QVariant::List) {
+        const QVariantList list = v.toList();
+
+        result = QLatin1String("List [");
+        for (const auto &item : list)
+            result += indented + dumpVariant(item, indented);
+        result.chop(1);             // remove comma
+        result += indent + QLatin1String("],");
+    } else {
+        QDebug debug(&result);
+        debug.nospace() << v << ',';
+    }
+    return result;
+}
+
+QString DataStreamDumper::name()
+{
+    return QStringLiteral("datastream-dump");
+}
+
+Converter::Direction DataStreamDumper::directions()
+{
+    return Out;
+}
+
+Converter::Options DataStreamDumper::outputOptions()
+{
+    return SupportsArbitraryMapKeys;
+}
+
+const char *DataStreamDumper::optionsHelp()
+{
+    return nullptr;
+}
+
+bool DataStreamDumper::probeFile(QIODevice *f)
+{
+    Q_UNUSED(f);
+    return false;
+}
+
+QVariant DataStreamDumper::loadFile(QIODevice *f, Converter *&outputConverter)
+{
+    Q_UNREACHABLE();
+    Q_UNUSED(f);
+    Q_UNUSED(outputConverter);
+    return QVariant();
+}
+
+void DataStreamDumper::saveFile(QIODevice *f, const QVariant &contents, const QStringList &options)
+{
+    Q_UNUSED(options);
+    QString s = dumpVariant(contents);
+    s[s.size() - 1] = QLatin1Char('\n');    // replace the comma with newline
+
+    QTextStream out(f);
+    out << s;
+}
+
+DataStreamConverter::DataStreamConverter()
+{
+    qRegisterMetaType<VariantOrderedMap>();
+    qRegisterMetaTypeStreamOperators<VariantOrderedMap>();
+}
+
+QString DataStreamConverter::name()
+{
+    return QStringLiteral("datastream");
+}
+
+Converter::Direction DataStreamConverter::directions()
+{
+    return InOut;
+}
+
+Converter::Options DataStreamConverter::outputOptions()
+{
+    return SupportsArbitraryMapKeys;
+}
+
+const char *DataStreamConverter::optionsHelp()
+{
+    return optionHelp;
+}
+
+bool DataStreamConverter::probeFile(QIODevice *f)
+{
+    return f->isReadable() && f->peek(sizeof(signature) - 1) == signature;
+}
+
+QVariant DataStreamConverter::loadFile(QIODevice *f, Converter *&outputConverter)
+{
+    if (!outputConverter)
+        outputConverter = &dataStreamDumper;
+
+    char c;
+    if (f->read(sizeof(signature) -1) != signature ||
+            !f->getChar(&c) || (c != 'l' && c != 'B')) {
+        fprintf(stderr, "Could not load QDataStream file: invalid signature.\n");
+        exit(EXIT_FAILURE);
+    }
+
+    QDataStream ds(f);
+    ds.setByteOrder(c == 'l' ? QDataStream::LittleEndian : QDataStream::BigEndian);
+
+    std::underlying_type<QDataStream::Version>::type version;
+    ds >> version;
+    ds.setVersion(QDataStream::Version(version));
+
+    QVariant result;
+    ds >> result;
+    return result;
+}
+
+void DataStreamConverter::saveFile(QIODevice *f, const QVariant &contents, const QStringList &options)
+{
+    QDataStream::Version version = QDataStream::Qt_5_0;
+    auto order = QDataStream::ByteOrder(QSysInfo::ByteOrder);
+    for (const QString &option : options) {
+        const QStringList pair = option.split('=');
+        if (pair.size() == 2) {
+            if (pair.first() == "byteorder") {
+                if (pair.last() == "little") {
+                    order = QDataStream::LittleEndian;
+                    continue;
+                } else if (pair.last() == "big") {
+                    order = QDataStream::BigEndian;
+                    continue;
+                } else if (pair.last() == "host") {
+                    order = QDataStream::ByteOrder(QSysInfo::ByteOrder);
+                    continue;
+                }
+            }
+            if (pair.first() == "version") {
+                bool ok;
+                int n = pair.last().toInt(&ok);
+                if (ok) {
+                    version = QDataStream::Version(n);
+                    continue;
+                }
+
+                fprintf(stderr, "Invalid version number '%s': must be a number from 1 to %d.\n",
+                        qPrintable(pair.last()), QDataStream::Qt_DefaultCompiledVersion);
+                exit(EXIT_FAILURE);
+            }
+        }
+
+        fprintf(stderr, "Unknown QDataStream formatting option '%s'. Available options are:\n%s",
+                qPrintable(option), optionHelp);
+        exit(EXIT_FAILURE);
+    }
+
+    char c = order == QDataStream::LittleEndian ? 'l'  : 'B';
+    f->write(signature);
+    f->write(&c, 1);
+
+    QDataStream ds(f);
+    ds.setVersion(version);
+    ds.setByteOrder(order);
+    ds << std::underlying_type<decltype(version)>::type(version);
+    ds << contents;
+}