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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
QT_FORWARD_DECLARE_CLASS(QIODevice)
QT_FORWARD_DECLARE_CLASS(QString)
#include <QtCore/QFlags>
class QC14N
{
public:
static bool isEqual(QIODevice *const firstDocument,
QIODevice *const secondDocument,
QString *const message = nullptr);
private:
static bool isDifferent(const QXmlStreamReader &r1,
const QXmlStreamReader &r2,
QString *const message);
static bool isAttributesEqual(const QXmlStreamReader &r1,
const QXmlStreamReader &r2,
QString *const message);
};
#include <QXmlStreamReader>
/*! \internal
\a firstDocument and \a secondDocument must be pointers to opened devices.
*/
bool QC14N::isEqual(QIODevice *const firstDocument,
QIODevice *const secondDocument,
QString *const message)
{
qDebug() << Q_FUNC_INFO;
if (!firstDocument)
qFatal("%s: A valid firstDocument QIODevice pointer must be supplied", Q_FUNC_INFO);
if (!secondDocument)
qFatal("%s: A valid secondDocument QIODevice pointer must be supplied", Q_FUNC_INFO);
if (!firstDocument->isReadable())
qFatal("%s: The firstDocument device must be readable.", Q_FUNC_INFO);
if (!secondDocument->isReadable())
qFatal("%s: The secondDocument device must be readable.", Q_FUNC_INFO);
QXmlStreamReader r1(firstDocument);
QXmlStreamReader r2(secondDocument);
while(!r1.atEnd())
{
if(r1.error())
{
if(message)
*message = r1.errorString();
return false;
}
else if(r2.error())
{
if(message)
*message = r1.errorString();
return false;
}
else
{
if(isDifferent(r1, r2, message))
return true;
}
r1.readNext();
r2.readNext();
}
if(!r2.atEnd())
{
if(message)
*message = QLatin1String("Reached the end of the first document, while there was still content left in the second");
return false;
}
/* And they lived happily ever after. */
return true;
}
/*! \internal
*/
bool QC14N::isAttributesEqual(const QXmlStreamReader &r1,
const QXmlStreamReader &r2,
QString *const message)
{
Q_UNUSED(message);
const QXmlStreamAttributes &attrs1 = r1.attributes();
const QXmlStreamAttributes &attrs2 = r2.attributes();
const int len = attrs1.size();
if(len != attrs2.size())
return false;
for(int i = 0; i < len; ++i)
{
if(!attrs2.contains(attrs1.at(i)))
return false;
}
return true;
}
bool QC14N::isDifferent(const QXmlStreamReader &r1,
const QXmlStreamReader &r2,
QString *const message)
{
// TODO error reporting can be a lot better here.
if(r1.tokenType() != r2.tokenType())
return false;
switch(r1.tokenType())
{
case QXmlStreamReader::NoToken:
/* Fallthrough. */
case QXmlStreamReader::StartDocument:
/* Fallthrough. */
case QXmlStreamReader::EndDocument:
/* Fallthrough. */
case QXmlStreamReader::DTD:
return true;
case QXmlStreamReader::Invalid:
return false;
case QXmlStreamReader::StartElement:
{
return r1.qualifiedName() == r2.qualifiedName()
/* Yes, the namespace test below should be redundant, but with it we
* trap namespace bugs in QXmlStreamReader, if any. */
&& r1.namespaceUri() == r2.namespaceUri()
&& isAttributesEqual(r1, r2, message);
}
case QXmlStreamReader::EndElement:
{
return r1.qualifiedName() == r2.qualifiedName()
&& r1.namespaceUri() == r2.namespaceUri()
&& r1.name() == r2.name();
}
case QXmlStreamReader::Characters:
/* Fallthrough. */
case QXmlStreamReader::Comment:
return r1.text() == r2.text();
case QXmlStreamReader::EntityReference:
case QXmlStreamReader::ProcessingInstruction:
{
return r1.processingInstructionTarget() == r2.processingInstructionTarget() &&
r2.processingInstructionData() == r2.processingInstructionData();
}
default:
qFatal("%s: Unknown tokenType: %d", Q_FUNC_INFO, static_cast<int>(r1.tokenType()));
return false;
}
}
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