PdfCanvasInputDevice.h

// SPDX-FileCopyrightText: 2022 Francesco Pretto <ceztko@gmail.com>
// SPDX-License-Identifier: LGPL-2.0-or-later OR MPL-2.0
 
#ifndef PDF_CANVAS_INPUT_DEVICE_H
#define PDF_CANVAS_INPUT_DEVICE_H
 
#include <podofo/auxiliary/InputDevice.h>
 
#include <list>
 
namespace PoDoFo {
 
class PdfCanvas;
class PdfObject;
 
class PODOFO_API PdfCanvasInputDevice final : public InputStreamDevice
{
public:
    PdfCanvasInputDevice(const PdfCanvas& canvas);
public:
    size_t GetLength() const override;
    size_t GetPosition() const override;
    bool Eof() const override { return m_eof; }
private:
    bool tryGetNextDevice(InputStreamDevice*& device);
    bool tryPopNextDevice();
    void setEOF();
protected:
    size_t readBuffer(char* buffer, size_t size, bool& eof) override;
    bool readChar(char& ch) override;
    bool peek(char& ch) const override;
private:
    bool m_eof;
    std::list<const PdfObject*> m_contents;
    charbuff m_buffer;
    std::unique_ptr<InputStreamDevice> m_currDevice;
    bool m_deviceSwitchOccurred;
};
 
}
 
#endif // PDF_CANVAS_INPUT_DEVICE_H