9be00330af
This example converts to and from: - Binary JSON - CBOR - CBOR Diagnostic notation (output only) - JSON - Null (output only) - QDataStream - QVariant dump (output only) - Text - XML Change-Id: Ibab69e0efefb40bdbf94fffd150b59f8c0da3174 Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>
274 lines
8.4 KiB
C++
274 lines
8.4 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2018 Intel Corporation.
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of the examples of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:BSD$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** BSD License Usage
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** Alternatively, you may use this file under the terms of the BSD license
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** as follows:
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** distribution.
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** * Neither the name of The Qt Company Ltd nor the names of its
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** contributors may be used to endorse or promote products derived
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** from this software without specific prior written permission.
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**
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "datastreamconverter.h"
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#include <QDataStream>
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#include <QDebug>
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#include <QTextStream>
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static const char optionHelp[] =
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"byteorder=host|big|little Byte order to use.\n"
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"version=<n> QDataStream version (default: Qt 5.0).\n"
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;
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static const char signature[] = "qds";
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static DataStreamDumper dataStreamDumper;
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static DataStreamConverter DataStreamConverter;
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QDataStream &operator<<(QDataStream &ds, const VariantOrderedMap &map)
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{
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ds << qint64(map.size());
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for (const auto &pair : map)
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ds << pair.first << pair.second;
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return ds;
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}
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QDataStream &operator>>(QDataStream &ds, VariantOrderedMap &map)
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{
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map.clear();
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qint64 size;
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ds >> size;
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map.reserve(size);
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while (size-- > 0) {
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VariantOrderedMap::value_type pair;
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ds >> pair.first >> pair.second;
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map.append(pair);
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}
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return ds;
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}
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static QString dumpVariant(const QVariant &v, const QString &indent = QLatin1String("\n"))
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{
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QString result;
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QString indented = indent + QLatin1String(" ");
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int type = v.userType();
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if (type == qMetaTypeId<VariantOrderedMap>() || type == QVariant::Map) {
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const auto map = (type == QVariant::Map) ?
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VariantOrderedMap(v.toMap()) : v.value<VariantOrderedMap>();
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result = QLatin1String("Map {");
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for (const auto &pair : map) {
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result += indented + dumpVariant(pair.first, indented);
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result.chop(1); // remove comma
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result += QLatin1String(" => ") + dumpVariant(pair.second, indented);
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}
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result.chop(1); // remove comma
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result += indent + QLatin1String("},");
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} else if (type == QVariant::List) {
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const QVariantList list = v.toList();
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result = QLatin1String("List [");
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for (const auto &item : list)
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result += indented + dumpVariant(item, indented);
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result.chop(1); // remove comma
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result += indent + QLatin1String("],");
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} else {
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QDebug debug(&result);
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debug.nospace() << v << ',';
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}
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return result;
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}
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QString DataStreamDumper::name()
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{
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return QStringLiteral("datastream-dump");
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}
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Converter::Direction DataStreamDumper::directions()
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{
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return Out;
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}
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Converter::Options DataStreamDumper::outputOptions()
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{
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return SupportsArbitraryMapKeys;
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}
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const char *DataStreamDumper::optionsHelp()
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{
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return nullptr;
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}
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bool DataStreamDumper::probeFile(QIODevice *f)
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{
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Q_UNUSED(f);
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return false;
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}
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QVariant DataStreamDumper::loadFile(QIODevice *f, Converter *&outputConverter)
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{
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Q_UNREACHABLE();
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Q_UNUSED(f);
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Q_UNUSED(outputConverter);
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return QVariant();
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}
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void DataStreamDumper::saveFile(QIODevice *f, const QVariant &contents, const QStringList &options)
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{
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Q_UNUSED(options);
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QString s = dumpVariant(contents);
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s[s.size() - 1] = QLatin1Char('\n'); // replace the comma with newline
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QTextStream out(f);
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out << s;
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}
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DataStreamConverter::DataStreamConverter()
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{
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qRegisterMetaType<VariantOrderedMap>();
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qRegisterMetaTypeStreamOperators<VariantOrderedMap>();
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}
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QString DataStreamConverter::name()
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{
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return QStringLiteral("datastream");
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}
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Converter::Direction DataStreamConverter::directions()
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{
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return InOut;
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}
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Converter::Options DataStreamConverter::outputOptions()
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{
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return SupportsArbitraryMapKeys;
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}
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const char *DataStreamConverter::optionsHelp()
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{
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return optionHelp;
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}
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bool DataStreamConverter::probeFile(QIODevice *f)
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{
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return f->isReadable() && f->peek(sizeof(signature) - 1) == signature;
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}
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QVariant DataStreamConverter::loadFile(QIODevice *f, Converter *&outputConverter)
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{
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if (!outputConverter)
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outputConverter = &dataStreamDumper;
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char c;
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if (f->read(sizeof(signature) -1) != signature ||
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!f->getChar(&c) || (c != 'l' && c != 'B')) {
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fprintf(stderr, "Could not load QDataStream file: invalid signature.\n");
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exit(EXIT_FAILURE);
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}
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QDataStream ds(f);
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ds.setByteOrder(c == 'l' ? QDataStream::LittleEndian : QDataStream::BigEndian);
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std::underlying_type<QDataStream::Version>::type version;
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ds >> version;
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ds.setVersion(QDataStream::Version(version));
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QVariant result;
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ds >> result;
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return result;
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}
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void DataStreamConverter::saveFile(QIODevice *f, const QVariant &contents, const QStringList &options)
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{
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QDataStream::Version version = QDataStream::Qt_5_0;
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auto order = QDataStream::ByteOrder(QSysInfo::ByteOrder);
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for (const QString &option : options) {
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const QStringList pair = option.split('=');
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if (pair.size() == 2) {
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if (pair.first() == "byteorder") {
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if (pair.last() == "little") {
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order = QDataStream::LittleEndian;
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continue;
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} else if (pair.last() == "big") {
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order = QDataStream::BigEndian;
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continue;
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} else if (pair.last() == "host") {
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order = QDataStream::ByteOrder(QSysInfo::ByteOrder);
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continue;
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}
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}
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if (pair.first() == "version") {
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bool ok;
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int n = pair.last().toInt(&ok);
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if (ok) {
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version = QDataStream::Version(n);
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continue;
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}
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fprintf(stderr, "Invalid version number '%s': must be a number from 1 to %d.\n",
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qPrintable(pair.last()), QDataStream::Qt_DefaultCompiledVersion);
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exit(EXIT_FAILURE);
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}
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}
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fprintf(stderr, "Unknown QDataStream formatting option '%s'. Available options are:\n%s",
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qPrintable(option), optionHelp);
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exit(EXIT_FAILURE);
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}
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char c = order == QDataStream::LittleEndian ? 'l' : 'B';
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f->write(signature);
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f->write(&c, 1);
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QDataStream ds(f);
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ds.setVersion(version);
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ds.setByteOrder(order);
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ds << std::underlying_type<decltype(version)>::type(version);
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ds << contents;
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}
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