mirror of
https://github.com/JakubMelka/PDF4QT.git
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103 lines
3.6 KiB
C++
103 lines
3.6 KiB
C++
// MIT License
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//
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// Copyright (c) 2018-2025 Jakub Melka and Contributors
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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#ifndef PDFXREFTABLE_H
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#define PDFXREFTABLE_H
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#include "pdfglobal.h"
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#include "pdfobject.h"
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#include <vector>
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namespace pdf
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{
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class PDFParsingContext;
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/// Represents table of references in the PDF file. It contains
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/// scanned table in the PDF file, together with information, if entry
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/// is occupied, or it is free.
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class PDFXRefTable
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{
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Q_DECLARE_TR_FUNCTIONS(pdf::PDFXRefTable)
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public:
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inline explicit PDFXRefTable() = default;
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// Enforce default copy constructor and default move constructor
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inline PDFXRefTable(const PDFXRefTable&) = default;
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inline PDFXRefTable(PDFXRefTable&&) = default;
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// Enforce default copy assignment operator and move assignment operator
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inline PDFXRefTable& operator=(const PDFXRefTable&) = default;
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inline PDFXRefTable& operator=(PDFXRefTable&&) = default;
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enum class EntryType
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{
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Free, ///< Entry represents a free item (no object)
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Occupied, ///< Entry represents a occupied item (object)
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InObjectStream ///< Entry in object stream
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};
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struct Entry
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{
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PDFObjectReference reference;
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PDFObjectReference objectStream;
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PDFInteger offset = -1;
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PDFInteger indexInObjectStream = -1;
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EntryType type = EntryType::Free;
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};
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/// Tries to read reference table from the byte array. If error occurs, then exception
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/// is raised. This fuction also checks redundant entries.
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/// \param context Current parsing context
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/// \param byteArray Input byte array (containing the PDF file)
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/// \param startTableOffset Offset of first reference table
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void readXRefTable(PDFParsingContext* context, const QByteArray& byteArray, PDFInteger startTableOffset);
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/// Filters only occupied entries and returns them
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std::vector<Entry> getOccupiedEntries() const;
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/// Filters only object stream entries and returns them
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std::vector<Entry> getObjectStreamEntries() const;
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/// Returns size of the reference table
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std::size_t getSize() const { return m_entries.size(); }
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/// Gets the entry for given reference. If entry for given reference is not found,
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/// then free entry is returned.
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const Entry& getEntry(PDFObjectReference reference) const;
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/// Returns the trailer dictionary
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const PDFObject& getTrailerDictionary() const { return m_trailerDictionary; }
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private:
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/// Reference table entries
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std::vector<Entry> m_entries;
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/// Trailer dictionary
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PDFObject m_trailerDictionary;
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};
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} // namespace pdf
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#endif // PDFXREFTABLE_H
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