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/*
Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies)
Copyright (C) 2017 Konstantin Tokarev <annulen@yandex.ru>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include "BlobUrlConversion.h"
#include "BlobData.h"
#include "BlobRegistryImpl.h"
#include <QUrl>
#include <wtf/text/Base64.h>
namespace WebCore {
static bool appendBlobResolved(Vector<char>& out, const URL& url, QString* contentType = 0)
{
RefPtr<BlobData> blobData = static_cast<BlobRegistryImpl&>(blobRegistry()).getBlobDataFromURL(url);
if (!blobData)
return false;
if (contentType)
*contentType = blobData->contentType();
BlobDataItemList::const_iterator it = blobData->items().begin();
const BlobDataItemList::const_iterator itend = blobData->items().end();
for (; it != itend; ++it) {
const BlobDataItem& blobItem = *it;
if (blobItem.type() == BlobDataItem::Type::Data) {
if (!out.tryAppend(reinterpret_cast<const char*>(blobItem.data().data()->data()) + blobItem.offset(), blobItem.length()))
return false;
} else if (blobItem.type() == BlobDataItem::Type::File) {
// File types are not allowed here, so just ignore it.
RELEASE_ASSERT_WITH_MESSAGE(false, "File types are not allowed here");
} else
ASSERT_NOT_REACHED();
}
return true;
}
static QUrl resolveBlobUrl(const URL& url)
{
RefPtr<BlobData> blobData = static_cast<BlobRegistryImpl&>(blobRegistry()).getBlobDataFromURL(url);
if (!blobData)
return QUrl();
Vector<char> data;
QString contentType;
if (!appendBlobResolved(data, url, &contentType)) {
qWarning("Failed to convert blob data to base64: cannot allocate memory for continuous blob data");
return QUrl();
}
// QByteArray::{from,to}Base64 are prone to integer overflow, this is the maximum size that can be safe
size_t maxBase64Size = std::numeric_limits<int>::max() / 3 - 1;
Vector<char> base64;
WTF::base64Encode(data, base64, WTF::Base64URLPolicy);
if (base64.isEmpty() || base64.size() > maxBase64Size) {
qWarning("Failed to convert blob data to base64: data is too large");
return QUrl();
}
QString dataUri(QStringLiteral("data:"));
dataUri.append(contentType);
dataUri.append(QStringLiteral(";base64,"));
dataUri.reserve(dataUri.size() + base64.size());
dataUri.append(QLatin1String(base64.data(), base64.size()));
return QUrl(dataUri);
}
QUrl convertBlobToDataUrl(const QUrl& url)
{
QT_TRY {
return resolveBlobUrl(url);
} QT_CATCH(const std::bad_alloc &) {
qWarning("Failed to convert blob data to base64: not enough memory");
}
return QUrl();
}
} // namespace WebCore
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