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+/****************************************************************************
+**
+** Copyright (C) 2020 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the QtPDF module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL3$
+** 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 http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPLv3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or later as published by the Free
+** Software Foundation and appearing in the file LICENSE.GPL included in
+** the packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QPDFDOCUMENT_P_H
+#define QPDFDOCUMENT_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include "qpdfdocument.h"
+
+#include "third_party/pdfium/public/fpdfview.h"
+#include "third_party/pdfium/public/fpdf_dataavail.h"
+
+#include <QtCore/qbuffer.h>
+#include <QtCore/qmutex.h>
+#include <QtCore/qpointer.h>
+#include <QtNetwork/qnetworkreply.h>
+
+#include <mutex>
+
+QT_BEGIN_NAMESPACE
+
+class QPdfMutexLocker : public std::unique_lock<QRecursiveMutex>
+{
+public:
+    QPdfMutexLocker();
+};
+
+class Q_PDF_PRIVATE_EXPORT QPdfDocumentPrivate: public FPDF_FILEACCESS, public FX_FILEAVAIL, public FX_DOWNLOADHINTS
+{
+public:
+    QPdfDocumentPrivate();
+    ~QPdfDocumentPrivate();
+
+    QPdfDocument *q;
+
+    FPDF_AVAIL avail;
+    FPDF_DOCUMENT doc;
+    bool loadComplete;
+
+    QPointer<QIODevice> device;
+    QScopedPointer<QIODevice> ownDevice;
+    QBuffer asyncBuffer;
+    QPointer<QIODevice> sequentialSourceDevice;
+    QByteArray password;
+
+    QPdfDocument::Status status;
+    QPdfDocument::DocumentError lastError;
+    int pageCount;
+
+    void clear();
+
+    void load(QIODevice *device, bool ownDevice);
+    void loadAsync(QIODevice *device);
+
+    void _q_tryLoadingWithSizeFromContentHeader();
+    void initiateAsyncLoadWithTotalSizeKnown(quint64 totalSize);
+    void _q_copyFromSequentialSourceDevice();
+    void tryLoadDocument();
+    void checkComplete();
+    bool checkPageComplete(int page);
+    void setStatus(QPdfDocument::Status status);
+
+    static FPDF_BOOL fpdf_IsDataAvail(struct _FX_FILEAVAIL* pThis, size_t offset, size_t size);
+    static int fpdf_GetBlock(void* param, unsigned long position, unsigned char* pBuf, unsigned long size);
+    static void fpdf_AddSegment(struct _FX_DOWNLOADHINTS* pThis, size_t offset, size_t size);
+    void updateLastError();
+    QString getText(FPDF_TEXTPAGE textPage, int startIndex, int count);
+    QPointF getCharPosition(FPDF_TEXTPAGE textPage, double pageHeight, int charIndex);
+    QRectF getCharBox(FPDF_TEXTPAGE textPage, double pageHeight, int charIndex);
+
+    struct TextPosition {
+        QPointF position;
+        qreal height = 0;
+        int charIndex = -1;
+    };
+    TextPosition hitTest(int page, QPointF position);
+};
+
+QT_END_NAMESPACE
+
+#endif // QPDFDOCUMENT_P_H