#ifndef QPDF_OFFSETINPUTSOURCE_HH

#define QPDF_OFFSETINPUTSOURCE_HH

// This class implements an InputSource that proxies for an underlying input source but offset a

// specific number of bytes.

#include <qpdf/InputSource.hh>

class OffsetInputSource: public InputSource

{

  public:

    OffsetInputSource(std::shared_ptr<InputSource>, qpdf_offset_t global_offset);

    ~OffsetInputSource() override = default;

    qpdf_offset_t findAndSkipNextEOL() override;

    std::string const& getName() const override;

    qpdf_offset_t tell() override;

    void seek(qpdf_offset_t offset, int whence) override;

    void rewind() override;

    size_t read(char* buffer, size_t length) override;

    void unreadCh(char ch) override;

  private:

    std::shared_ptr<InputSource> proxied;

    qpdf_offset_t global_offset;

    qpdf_offset_t max_safe_offset;

};

#endif // QPDF_OFFSETINPUTSOURCE_HH