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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "qplatformdefs.h"
#include "qurl.h"
#include "private/qdataurl_p.h"
QT_BEGIN_NAMESPACE
using namespace Qt::Literals;
/*!
\internal
Decode a data: URL into its mimetype and payload. Returns a null string if
the URL could not be decoded.
*/
Q_CORE_EXPORT bool qDecodeDataUrl(const QUrl &uri, QString &mimeType, QByteArray &payload)
{
if (uri.scheme() != "data"_L1 || !uri.host().isEmpty())
return false;
// the following would have been the correct thing, but
// reality often differs from the specification. People have
// data: URIs with ? and #
//QByteArray data = QByteArray::fromPercentEncoding(uri.path(QUrl::FullyEncoded).toLatin1());
const QByteArray dataArray =
QByteArray::fromPercentEncoding(uri.url(QUrl::FullyEncoded | QUrl::RemoveScheme).toLatin1());
auto data = QLatin1StringView{dataArray};
// parse it:
const qsizetype pos = data.indexOf(u',');
if (pos != -1) {
payload = QByteArray{data.sliced(pos + 1)};
data.truncate(pos);
data = data.trimmed();
// find out if the payload is encoded in Base64
constexpr auto base64 = ";base64"_L1; // per the RFC, at the end of `data`
if (data.endsWith(base64, Qt::CaseInsensitive)) {
auto r = QByteArray::fromBase64Encoding(std::move(payload));
if (!r) {
// just in case someone uses `payload` without checking the returned bool
payload = {};
return false; // decoding failed
}
payload = std::move(r.decoded);
data.chop(base64.size());
}
QLatin1StringView textPlain;
constexpr auto charset = "charset"_L1;
if (data.startsWith(charset, Qt::CaseInsensitive)) {
QLatin1StringView copy = data.sliced(charset.size());
while (copy.startsWith(u' '))
copy.slice(1);
if (copy.startsWith(u'='))
textPlain = "text/plain;"_L1;
}
if (!data.isEmpty())
mimeType = textPlain + data.trimmed();
else
mimeType = QStringLiteral("text/plain;charset=US-ASCII");
return true;
}
return false;
}
QT_END_NAMESPACE
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