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diff --git a/src/pdf/qpdfdocument_p.h b/src/pdf/qpdfdocument_p.h
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+++ b/src/pdf/qpdfdocument_p.h
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+// Copyright (C) 2020 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
+
+#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 "qtpdfexports.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 QPdfPageModel;
+
+class Q_PDF_EXPORT QPdfDocumentPrivate: public FPDF_FILEACCESS, public FX_FILEAVAIL, public FX_DOWNLOADHINTS
+{
+public:
+    QPdfDocumentPrivate();
+    ~QPdfDocumentPrivate();
+
+    QPdfDocument *q;
+    QPdfPageModel *pageModel = nullptr;
+
+    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::Error 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) const;
+    QPointF getCharPosition(FPDF_PAGE pdfPage, FPDF_TEXTPAGE textPage, int charIndex) const;
+    QRectF getCharBox(FPDF_PAGE pdfPage, FPDF_TEXTPAGE textPage, int charIndex) const;
+    QPointF mapPageToView(FPDF_PAGE pdfPage, double x, double y) const;
+    QRectF mapPageToView(FPDF_PAGE pdfPage, double left, double top, double right, double bottom) const;
+    QPointF mapViewToPage(FPDF_PAGE pdfPage, QPointF position) const;
+
+    // FPDF takes the rotation parameter as an int.
+    // This enum is mapping the int values defined in fpdfview.h:956.
+    // (not using enum class to ensure int convertability)
+    enum QFPDFRotation {
+        Normal = 0,
+        ClockWise90 = 1,
+        ClockWise180 = 2,
+        CounterClockWise90 = 3
+    };
+
+    static constexpr QFPDFRotation toFPDFRotation(QPdfDocumentRenderOptions::Rotation rotation)
+    {
+        switch (rotation) {
+        case QPdfDocumentRenderOptions::Rotation::None:
+            return QFPDFRotation::Normal;
+        case QPdfDocumentRenderOptions::Rotation::Clockwise90:
+            return QFPDFRotation::ClockWise90;
+        case QPdfDocumentRenderOptions::Rotation::Clockwise180:
+            return QFPDFRotation::ClockWise180;
+        case QPdfDocumentRenderOptions::Rotation::Clockwise270:
+            return QFPDFRotation::CounterClockWise90;
+        }
+        Q_UNREACHABLE();
+    }
+
+    struct TextPosition {
+        QPointF position;
+        qreal height = 0;
+        int charIndex = -1;
+    };
+    TextPosition hitTest(int page, QPointF position);
+};
+
+QT_END_NAMESPACE
+
+#endif // QPDFDOCUMENT_P_H