mirror of https://github.com/JakubMelka/PDF4QT.git
87 lines
3.2 KiB
C++
87 lines
3.2 KiB
C++
// Copyright (C) 2018 Jakub Melka
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//
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// This file is part of PdfForQt.
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//
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// PdfForQt is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// PdfForQt is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with PDFForQt. If not, see <https://www.gnu.org/licenses/>.
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#ifndef PDFDOCUMENTREADER_H
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#define PDFDOCUMENTREADER_H
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#include "pdfglobal.h"
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#include "pdfdocument.h"
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#include <QtCore>
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#include <QIODevice>
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namespace pdf
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{
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/// This class is a reader of PDF document from various devices (file, io device,
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/// byte buffer). This class doesn't throw exceptions, to check errors, use
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/// appropriate functions.
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class PDFDocumentReader
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{
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Q_DECLARE_TR_FUNCTIONS(pdf::PDFDocumentReader)
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public:
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explicit PDFDocumentReader();
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/// Reads a PDF document from the specified file. If file doesn't exist,
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/// cannot be opened or contain invalid pdf, empty PDF file is returned.
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/// No exception is thrown.
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PDFDocument readFromFile(const QString& fileName);
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/// Reads a PDF document from the specified device. If device is not opened
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/// for reading, then function tries it to open for reading. If it is opened,
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/// but not for reading, empty PDF document is returned. This also occurs
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/// when incorrect PDF is read. No exception is thrown.
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PDFDocument readFromDevice(QIODevice* device);
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/// Reads a PDF document from the specified buffer (byte array). If incorrect
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/// PDF is read, then empty PDF document is returned. No exception is thrown.
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PDFDocument readFromBuffer(const QByteArray& buffer);
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/// Returns true, if document was successfully read from device
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bool isSuccessfull() const { return m_successfull; }
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private:
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static constexpr const int FIND_NOT_FOUND_RESULT = -1;
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/// Resets the internal state and prepares it for new reading cycle
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void reset();
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/// Find a last string in the byte array, scan only \p limit bytes. If string
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/// is not found, then FIND_NOT_FOUND_RESULT is returned, if it is found, then
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/// it position from the beginning of byte array is returned.
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/// \param what String to be found
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/// \param byteArray Byte array to be scanned from the end
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/// \param limit Scan up to this value bytes from the end
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/// \returns Position of string, or FIND_NOT_FOUND_RESULT
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int findFromEnd(const char* what, const QByteArray& byteArray, int limit);
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/// This bool flag is set, if pdf document was successfully read from the device
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bool m_successfull;
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/// In case if error occurs, it is stored here
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QString m_errorMessage;
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/// Version of the scanned file
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PDFVersion m_version;
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};
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} // namespace pdf
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#endif // PDFDOCUMENTREADER_H
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