qt-everywhere-src-5.15.1/qtbase/examples/corelib/serialization/convert/cborconverter.cpp - orbit - Git at Google

 /****************************************************************************
 **
 ** 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 "cborconverter.h"

 #include <QCborStreamReader>
 #include <QCborStreamWriter>
 #include <QCborMap>
 #include <QCborArray>
 #include <QCborValue>
 #include <QDataStream>
 #include <QFloat16>
 #include <QFile>
 #include <QMetaType>
 #include <QTextStream>

 #include <stdio.h>

 static CborConverter cborConverter;
 static CborDiagnosticDumper cborDiagnosticDumper;

 static const char optionHelp[] =
         "convert-float-to-int=yes|no    Write integers instead of floating point, if no\n"
         "                               loss of precision occurs on conversion.\n"
         "float16=yes|always|no          Write using half-precision floating point.\n"
         "                               If 'always', won't check for loss of precision.\n"
         "float32=yes|always|no          Write using single-precision floating point.\n"
         "                               If 'always', won't check for loss of precision.\n"
         "signature=yes|no               Prepend the CBOR signature to the file output.\n"
         ;

 static const char diagnosticHelp[] =
         "extended=no|yes                Use extended CBOR diagnostic format.\n"
         "line-wrap=yes|no               Split output into multiple lines.\n"
         ;

 QT_BEGIN_NAMESPACE

 QDataStream &operator<<(QDataStream &ds, QCborTag tag)
 {
     return ds << quint64(tag);
 }

 QDataStream &operator>>(QDataStream &ds, QCborTag &tag)
 {
     quint64 v;
     ds >> v;
     tag = QCborTag(v);
     return ds;
 }

 QT_END_NAMESPACE

 // We can't use QCborValue::toVariant directly because that would destroy
 // non-string keys in CBOR maps (QVariantMap can't handle those). Instead, we
 // have our own set of converter functions so we can keep the keys properly.

 static QVariant convertCborValue(const QCborValue &value);

 static QVariant convertCborMap(const QCborMap &map)
 {
     VariantOrderedMap result;
     result.reserve(map.size());
     for (auto pair : map)
         result.append({ convertCborValue(pair.first), convertCborValue(pair.second) });
     return QVariant::fromValue(result);
 }

 static QVariant convertCborArray(const QCborArray &array)
 {
     QVariantList result;
     result.reserve(array.size());
     for (auto value : array)
         result.append(convertCborValue(value));
     return result;
 }

 static QVariant convertCborValue(const QCborValue &value)
 {
     if (value.isArray())
         return convertCborArray(value.toArray());
     if (value.isMap())
         return convertCborMap(value.toMap());
     return value.toVariant();
 }

 enum TrimFloatingPoint { Double, Float, Float16 };
 static QCborValue convertFromVariant(const QVariant &v, TrimFloatingPoint fpTrimming)
 {
     if (v.userType() == QMetaType::QVariantList) {
         const QVariantList list = v.toList();
         QCborArray array;
         for (const QVariant &v : list)
             array.append(convertFromVariant(v, fpTrimming));

         return array;
     }

     if (v.userType() == qMetaTypeId<VariantOrderedMap>()) {
         const auto m = qvariant_cast<VariantOrderedMap>(v);
         QCborMap map;
         for (const auto &pair : m)
             map.insert(convertFromVariant(pair.first, fpTrimming),
                        convertFromVariant(pair.second, fpTrimming));
         return map;
     }

     if (v.userType() == QMetaType::Double && fpTrimming != Double) {
         float f = float(v.toDouble());
         if (fpTrimming == Float16)
             return float(qfloat16(f));
         return f;
     }

     return QCborValue::fromVariant(v);
 }

 QString CborDiagnosticDumper::name()
 {
     return QStringLiteral("cbor-dump");
 }

 Converter::Direction CborDiagnosticDumper::directions()
 {
     return Out;
 }

 Converter::Options CborDiagnosticDumper::outputOptions()
 {
     return SupportsArbitraryMapKeys;
 }

 const char *CborDiagnosticDumper::optionsHelp()
 {
     return diagnosticHelp;
 }

 bool CborDiagnosticDumper::probeFile(QIODevice *f)
 {
     Q_UNUSED(f);
     return false;
 }

 QVariant CborDiagnosticDumper::loadFile(QIODevice *f, Converter *&outputConverter)
 {
     Q_UNREACHABLE();
     Q_UNUSED(f);
     Q_UNUSED(outputConverter);
     return QVariant();
 }

 void CborDiagnosticDumper::saveFile(QIODevice *f, const QVariant &contents, const QStringList &options)
 {
     QCborValue::DiagnosticNotationOptions opts = QCborValue::LineWrapped;
     for (const QString &s : options) {
         QStringList pair = s.split('=');
         if (pair.size() == 2) {
             if (pair.first() == "line-wrap") {
                 opts &= ~QCborValue::LineWrapped;
                 if (pair.last() == "yes") {
                     opts |= QCborValue::LineWrapped;
                     continue;
                 } else if (pair.last() == "no") {
                     continue;
                 }
             }
             if (pair.first() == "extended") {
                 opts &= ~QCborValue::ExtendedFormat;
                 if (pair.last() == "yes")
                     opts |= QCborValue::ExtendedFormat;
                 continue;
             }
         }

         fprintf(stderr, "Unknown CBOR diagnostic option '%s'. Available options are:\n%s",
                 qPrintable(s), diagnosticHelp);
         exit(EXIT_FAILURE);
     }

     QTextStream out(f);
     out << convertFromVariant(contents, Double).toDiagnosticNotation(opts)
         << Qt::endl;
 }

 CborConverter::CborConverter()
 {
     qRegisterMetaType<QCborTag>();
     qRegisterMetaTypeStreamOperators<QCborTag>();
     QMetaType::registerDebugStreamOperator<QCborTag>();
 }

 QString CborConverter::name()
 {
     return "cbor";
 }

 Converter::Direction CborConverter::directions()
 {
     return InOut;
 }

 Converter::Options CborConverter::outputOptions()
 {
     return SupportsArbitraryMapKeys;
 }

 const char *CborConverter::optionsHelp()
 {
     return optionHelp;
 }

 bool CborConverter::probeFile(QIODevice *f)
 {
     if (QFile *file = qobject_cast<QFile *>(f)) {
         if (file->fileName().endsWith(QLatin1String(".cbor")))
             return true;
     }
     return f->isReadable() && f->peek(3) == QByteArray("\xd9\xd9\xf7", 3);
 }

 QVariant CborConverter::loadFile(QIODevice *f, Converter *&outputConverter)
 {
     const char *ptr = nullptr;
     if (auto file = qobject_cast<QFile *>(f))
         ptr = reinterpret_cast<char *>(file->map(0, file->size()));

     QByteArray mapped = QByteArray::fromRawData(ptr, ptr ? f->size() : 0);
     QCborStreamReader reader(mapped);
     if (!ptr)
         reader.setDevice(f);

     if (reader.isTag() && reader.toTag() == QCborKnownTags::Signature)
         reader.next();

     QCborValue contents = QCborValue::fromCbor(reader);
     qint64 offset = reader.currentOffset();
     if (reader.lastError()) {
         fprintf(stderr, "Error loading CBOR contents (byte %lld): %s\n", offset,
                 qPrintable(reader.lastError().toString()));
         fprintf(stderr, " bytes: %s\n",
                 (ptr ? mapped.mid(offset, 9) : f->read(9)).toHex(' ').constData());
         exit(EXIT_FAILURE);
     } else if (offset < mapped.size() || (!ptr && f->bytesAvailable())) {
         fprintf(stderr, "Warning: bytes remaining at the end of the CBOR stream\n");
     }

     if (outputConverter == nullptr)
         outputConverter = &cborDiagnosticDumper;
     else if (outputConverter == null)
         return QVariant();
     else if (!outputConverter->outputOptions().testFlag(SupportsArbitraryMapKeys))
         return contents.toVariant();
     return convertCborValue(contents);
 }

 void CborConverter::saveFile(QIODevice *f, const QVariant &contents, const QStringList &options)
 {
     bool useSignature = true;
     bool useIntegers = true;
     enum { Yes, No, Always } useFloat16 = Yes, useFloat = Yes;

     for (const QString &s : options) {
         QStringList pair = s.split('=');
         if (pair.size() == 2) {
             if (pair.first() == "convert-float-to-int") {
                 if (pair.last() == "yes") {
                     useIntegers = true;
                     continue;
                 } else if (pair.last() == "no") {
                     useIntegers = false;
                     continue;
                 }
             }

             if (pair.first() == "float16") {
                 if (pair.last() == "no") {
                     useFloat16 = No;
                     continue;
                 } else if (pair.last() == "yes") {
                     useFloat16 = Yes;
                     continue;
                 } else if (pair.last() == "always") {
                     useFloat16 = Always;
                     continue;
                 }
             }

             if (pair.first() == "float32") {
                 if (pair.last() == "no") {
                     useFloat = No;
                     continue;
                 } else if (pair.last() == "yes") {
                     useFloat = Yes;
                     continue;
                 } else if (pair.last() == "always") {
                     useFloat = Always;
                     continue;
                 }
             }

             if (pair.first() == "signature") {
                 if (pair.last() == "yes") {
                     useSignature = true;
                     continue;
                 } else if (pair.last() == "no") {
                     useSignature = false;
                     continue;
                 }
             }
         }

         fprintf(stderr, "Unknown CBOR format option '%s'. Valid options are:\n%s",
                 qPrintable(s), optionHelp);
         exit(EXIT_FAILURE);
     }

     QCborValue v = convertFromVariant(contents,
                                       useFloat16 == Always ? Float16 : useFloat == Always ? Float : Double);
     QCborStreamWriter writer(f);
     if (useSignature)
         writer.append(QCborKnownTags::Signature);

     QCborValue::EncodingOptions opts;
     if (useIntegers)
         opts |= QCborValue::UseIntegers;
     if (useFloat != No)
         opts |= QCborValue::UseFloat;
     if (useFloat16 != No)
         opts |= QCborValue::UseFloat16;
     v.toCbor(writer, opts);
 }
	/****************************************************************************
	**
	** 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 "cborconverter.h"

	#include <QCborStreamReader>
	#include <QCborStreamWriter>
	#include <QCborMap>
	#include <QCborArray>
	#include <QCborValue>
	#include <QDataStream>
	#include <QFloat16>
	#include <QFile>
	#include <QMetaType>
	#include <QTextStream>

	#include <stdio.h>

	static CborConverter cborConverter;
	static CborDiagnosticDumper cborDiagnosticDumper;

	static const char optionHelp[] =
	"convert-float-to-int=yes\|no Write integers instead of floating point, if no\n"
	" loss of precision occurs on conversion.\n"
	"float16=yes\|always\|no Write using half-precision floating point.\n"
	" If 'always', won't check for loss of precision.\n"
	"float32=yes\|always\|no Write using single-precision floating point.\n"
	" If 'always', won't check for loss of precision.\n"
	"signature=yes\|no Prepend the CBOR signature to the file output.\n"
	;

	static const char diagnosticHelp[] =
	"extended=no\|yes Use extended CBOR diagnostic format.\n"
	"line-wrap=yes\|no Split output into multiple lines.\n"
	;

	QT_BEGIN_NAMESPACE

	QDataStream &operator<<(QDataStream &ds, QCborTag tag)
	{
	return ds << quint64(tag);
	}

	QDataStream &operator>>(QDataStream &ds, QCborTag &tag)
	{
	quint64 v;
	ds >> v;
	tag = QCborTag(v);
	return ds;
	}

	QT_END_NAMESPACE

	// We can't use QCborValue::toVariant directly because that would destroy
	// non-string keys in CBOR maps (QVariantMap can't handle those). Instead, we
	// have our own set of converter functions so we can keep the keys properly.

	static QVariant convertCborValue(const QCborValue &value);

	static QVariant convertCborMap(const QCborMap &map)
	{
	VariantOrderedMap result;
	result.reserve(map.size());
	for (auto pair : map)
	result.append({ convertCborValue(pair.first), convertCborValue(pair.second) });
	return QVariant::fromValue(result);
	}

	static QVariant convertCborArray(const QCborArray &array)
	{
	QVariantList result;
	result.reserve(array.size());
	for (auto value : array)
	result.append(convertCborValue(value));
	return result;
	}

	static QVariant convertCborValue(const QCborValue &value)
	{
	if (value.isArray())
	return convertCborArray(value.toArray());
	if (value.isMap())
	return convertCborMap(value.toMap());
	return value.toVariant();
	}

	enum TrimFloatingPoint { Double, Float, Float16 };
	static QCborValue convertFromVariant(const QVariant &v, TrimFloatingPoint fpTrimming)
	{
	if (v.userType() == QMetaType::QVariantList) {
	const QVariantList list = v.toList();
	QCborArray array;
	for (const QVariant &v : list)
	array.append(convertFromVariant(v, fpTrimming));

	return array;
	}

	if (v.userType() == qMetaTypeId<VariantOrderedMap>()) {
	const auto m = qvariant_cast<VariantOrderedMap>(v);
	QCborMap map;
	for (const auto &pair : m)
	map.insert(convertFromVariant(pair.first, fpTrimming),
	convertFromVariant(pair.second, fpTrimming));
	return map;
	}

	if (v.userType() == QMetaType::Double && fpTrimming != Double) {
	float f = float(v.toDouble());
	if (fpTrimming == Float16)
	return float(qfloat16(f));
	return f;
	}

	return QCborValue::fromVariant(v);
	}

	QString CborDiagnosticDumper::name()
	{
	return QStringLiteral("cbor-dump");
	}

	Converter::Direction CborDiagnosticDumper::directions()
	{
	return Out;
	}

	Converter::Options CborDiagnosticDumper::outputOptions()
	{
	return SupportsArbitraryMapKeys;
	}

	const char *CborDiagnosticDumper::optionsHelp()
	{
	return diagnosticHelp;
	}

	bool CborDiagnosticDumper::probeFile(QIODevice *f)
	{
	Q_UNUSED(f);
	return false;
	}

	QVariant CborDiagnosticDumper::loadFile(QIODevice f, Converter &outputConverter)
	{
	Q_UNREACHABLE();
	Q_UNUSED(f);
	Q_UNUSED(outputConverter);
	return QVariant();
	}

	void CborDiagnosticDumper::saveFile(QIODevice *f, const QVariant &contents, const QStringList &options)
	{
	QCborValue::DiagnosticNotationOptions opts = QCborValue::LineWrapped;
	for (const QString &s : options) {
	QStringList pair = s.split('=');
	if (pair.size() == 2) {
	if (pair.first() == "line-wrap") {
	opts &= ~QCborValue::LineWrapped;
	if (pair.last() == "yes") {
	opts \|= QCborValue::LineWrapped;
	continue;
	} else if (pair.last() == "no") {
	continue;
	}
	}
	if (pair.first() == "extended") {
	opts &= ~QCborValue::ExtendedFormat;
	if (pair.last() == "yes")
	opts \|= QCborValue::ExtendedFormat;
	continue;
	}
	}

	fprintf(stderr, "Unknown CBOR diagnostic option '%s'. Available options are:\n%s",
	qPrintable(s), diagnosticHelp);
	exit(EXIT_FAILURE);
	}

	QTextStream out(f);
	out << convertFromVariant(contents, Double).toDiagnosticNotation(opts)
	<< Qt::endl;
	}

	CborConverter::CborConverter()
	{
	qRegisterMetaType<QCborTag>();
	qRegisterMetaTypeStreamOperators<QCborTag>();
	QMetaType::registerDebugStreamOperator<QCborTag>();
	}

	QString CborConverter::name()
	{
	return "cbor";
	}

	Converter::Direction CborConverter::directions()
	{
	return InOut;
	}

	Converter::Options CborConverter::outputOptions()
	{
	return SupportsArbitraryMapKeys;
	}

	const char *CborConverter::optionsHelp()
	{
	return optionHelp;
	}

	bool CborConverter::probeFile(QIODevice *f)
	{
	if (QFile file = qobject_cast<QFile >(f)) {
	if (file->fileName().endsWith(QLatin1String(".cbor")))
	return true;
	}
	return f->isReadable() && f->peek(3) == QByteArray("\xd9\xd9\xf7", 3);
	}

	QVariant CborConverter::loadFile(QIODevice f, Converter &outputConverter)
	{
	const char *ptr = nullptr;
	if (auto file = qobject_cast<QFile *>(f))
	ptr = reinterpret_cast<char *>(file->map(0, file->size()));

	QByteArray mapped = QByteArray::fromRawData(ptr, ptr ? f->size() : 0);
	QCborStreamReader reader(mapped);
	if (!ptr)
	reader.setDevice(f);

	if (reader.isTag() && reader.toTag() == QCborKnownTags::Signature)
	reader.next();

	QCborValue contents = QCborValue::fromCbor(reader);
	qint64 offset = reader.currentOffset();
	if (reader.lastError()) {
	fprintf(stderr, "Error loading CBOR contents (byte %lld): %s\n", offset,
	qPrintable(reader.lastError().toString()));
	fprintf(stderr, " bytes: %s\n",
	(ptr ? mapped.mid(offset, 9) : f->read(9)).toHex(' ').constData());
	exit(EXIT_FAILURE);
	} else if (offset < mapped.size() \|\| (!ptr && f->bytesAvailable())) {
	fprintf(stderr, "Warning: bytes remaining at the end of the CBOR stream\n");
	}

	if (outputConverter == nullptr)
	outputConverter = &cborDiagnosticDumper;
	else if (outputConverter == null)
	return QVariant();
	else if (!outputConverter->outputOptions().testFlag(SupportsArbitraryMapKeys))
	return contents.toVariant();
	return convertCborValue(contents);
	}

	void CborConverter::saveFile(QIODevice *f, const QVariant &contents, const QStringList &options)
	{
	bool useSignature = true;
	bool useIntegers = true;
	enum { Yes, No, Always } useFloat16 = Yes, useFloat = Yes;

	for (const QString &s : options) {
	QStringList pair = s.split('=');
	if (pair.size() == 2) {
	if (pair.first() == "convert-float-to-int") {
	if (pair.last() == "yes") {
	useIntegers = true;
	continue;
	} else if (pair.last() == "no") {
	useIntegers = false;
	continue;
	}
	}

	if (pair.first() == "float16") {
	if (pair.last() == "no") {
	useFloat16 = No;
	continue;
	} else if (pair.last() == "yes") {
	useFloat16 = Yes;
	continue;
	} else if (pair.last() == "always") {
	useFloat16 = Always;
	continue;
	}
	}

	if (pair.first() == "float32") {
	if (pair.last() == "no") {
	useFloat = No;
	continue;
	} else if (pair.last() == "yes") {
	useFloat = Yes;
	continue;
	} else if (pair.last() == "always") {
	useFloat = Always;
	continue;
	}
	}

	if (pair.first() == "signature") {
	if (pair.last() == "yes") {
	useSignature = true;
	continue;
	} else if (pair.last() == "no") {
	useSignature = false;
	continue;
	}
	}
	}

	fprintf(stderr, "Unknown CBOR format option '%s'. Valid options are:\n%s",
	qPrintable(s), optionHelp);
	exit(EXIT_FAILURE);
	}

	QCborValue v = convertFromVariant(contents,
	useFloat16 == Always ? Float16 : useFloat == Always ? Float : Double);
	QCborStreamWriter writer(f);
	if (useSignature)
	writer.append(QCborKnownTags::Signature);

	QCborValue::EncodingOptions opts;
	if (useIntegers)
	opts \|= QCborValue::UseIntegers;
	if (useFloat != No)
	opts \|= QCborValue::UseFloat;
	if (useFloat16 != No)
	opts \|= QCborValue::UseFloat16;
	v.toCbor(writer, opts);
	}