mirror of https://github.com/JakubMelka/PDF4QT.git
87 lines
3.3 KiB
C++
87 lines
3.3 KiB
C++
// Copyright (C) 2020-2021 Jakub Melka
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//
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// This file is part of PDF4QT.
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//
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// PDF4QT 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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// with the written consent of the copyright owner, any later version.
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//
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// PDF4QT 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 PDF4QT. If not, see <https://www.gnu.org/licenses/>.
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#ifndef PDFDOCUMENTWRITER_H
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#define PDFDOCUMENTWRITER_H
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#include "pdfdocument.h"
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#include "pdfprogress.h"
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#include "pdfutils.h"
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#include <QIODevice>
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namespace pdf
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{
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/// Class used for writing PDF documents to the desired target device (or file,
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/// buffer, etc.). If writing is not successful, then error message is returned.
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class PDF4QTLIBSHARED_EXPORT PDFDocumentWriter
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{
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Q_DECLARE_TR_FUNCTIONS(pdf::PDFDocumentWriter)
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public:
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explicit inline PDFDocumentWriter(PDFProgress* progress) :
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m_progress(progress)
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{
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}
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/// Writes document to the file. If \p safeWrite is true, then document is first
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/// written to the temporary file, and then renamed to original file name atomically,
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/// so no data can be lost on, for example, power failure. If it is not possible to
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/// create temporary file, then writing operation will attempt to write to the file
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/// directly.
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/// \param fileName File name
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/// \param document Document
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/// \param safeWrite Write document to the temporary file and then rename
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PDFOperationResult write(const QString& fileName, const PDFDocument* document, bool safeWrite);
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/// Write document to the output device. Device must be writable (i.e. opened
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/// for writing).
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/// \param device Output device
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/// \param document Document
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PDFOperationResult write(QIODevice* device, const PDFDocument* document);
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/// Calculates document file size, as if it is written to the disk.
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/// No file is accessed by this function; document is written
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/// to fake stream, which counts operations. If error occurs, and
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/// size can't be determined, then -1 is returned.
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/// \param document Document
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static qint64 getDocumentFileSize(const PDFDocument* document);
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/// Calculates size estimate of an object. If object is null, then zero is returned.
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/// \param document Document
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/// \param reference Reference
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static qint64 getObjectSize(const PDFDocument* document, PDFObjectReference reference);
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/// Writes an object to byte array, without object header/footer
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/// \param object Object to be written
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static QByteArray getSerializedObject(const PDFObject& object);
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private:
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static void writeCRLF(QIODevice* device);
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static void writeObjectHeader(QIODevice* device, PDFObjectReference reference);
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static void writeObjectFooter(QIODevice* device);
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/// Progress indicator
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PDFProgress* m_progress;
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};
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} // namespace pdf
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#endif // PDFDOCUMENTWRITER_H
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