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Catalog (first part)
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Jakub Melka
318
PdfForQtLib/sources/pdfcatalog.cpp
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318
PdfForQtLib/sources/pdfcatalog.cpp
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// 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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#include "pdfcatalog.h"
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#include "pdfparser.h"
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#include "pdfdocument.h"
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namespace pdf
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{
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static constexpr const char* PDF_VIEWER_PREFERENCES_DICTIONARY = "ViewerPreferences";
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static constexpr const char* PDF_VIEWER_PREFERENCES_HIDE_TOOLBAR = "HideToolbar";
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static constexpr const char* PDF_VIEWER_PREFERENCES_HIDE_MENUBAR = "HideMenubar";
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static constexpr const char* PDF_VIEWER_PREFERENCES_HIDE_WINDOW_UI = "HideWindowUI";
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static constexpr const char* PDF_VIEWER_PREFERENCES_FIT_WINDOW = "FitWindow";
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static constexpr const char* PDF_VIEWER_PREFERENCES_CENTER_WINDOW = "CenterWindow";
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static constexpr const char* PDF_VIEWER_PREFERENCES_DISPLAY_DOCUMENT_TITLE = "DisplayDocTitle";
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static constexpr const char* PDF_VIEWER_PREFERENCES_NON_FULLSCREEN_PAGE_MODE = "NonFullScreenPageMode";
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static constexpr const char* PDF_VIEWER_PREFERENCES_DIRECTION = "Direction";
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static constexpr const char* PDF_VIEWER_PREFERENCES_VIEW_AREA = "ViewArea";
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static constexpr const char* PDF_VIEWER_PREFERENCES_VIEW_CLIP = "ViewClip";
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static constexpr const char* PDF_VIEWER_PREFERENCES_PRINT_AREA = "PrintArea";
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static constexpr const char* PDF_VIEWER_PREFERENCES_PRINT_CLIP = "PrintClip";
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static constexpr const char* PDF_VIEWER_PREFERENCES_PRINT_SCALING = "PrintScaling";
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static constexpr const char* PDF_VIEWER_PREFERENCES_DUPLEX = "Duplex";
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static constexpr const char* PDF_VIEWER_PREFERENCES_PICK_TRAY_BY_PDF_SIZE = "PickTrayByPDFSize";
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static constexpr const char* PDF_VIEWER_PREFERENCES_NUMBER_OF_COPIES = "NumCopies";
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static constexpr const char* PDF_VIEWER_PREFERENCES_PRINT_PAGE_RANGE = "PrintPageRange";
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PDFCatalog PDFCatalog::parse(const PDFObject& catalog, const PDFDocument* document)
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{
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if (!catalog.isDictionary())
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{
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throw PDFParserException(PDFTranslationContext::tr("Catalog must be a dictionary."));
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}
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PDFCatalog catalogObject;
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catalogObject.m_viewerPreferences = PDFViewerPreferences::parse(catalog, document);
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return catalogObject;
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}
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PDFViewerPreferences PDFViewerPreferences::parse(const PDFObject& catalogDictionary, const PDFDocument* document)
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{
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PDFViewerPreferences result;
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if (!catalogDictionary.isDictionary())
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{
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throw PDFParserException(PDFTranslationContext::tr("Catalog must be a dictionary."));
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}
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const PDFDictionary* dictionary = catalogDictionary.getDictionary();
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if (dictionary->hasKey(PDF_VIEWER_PREFERENCES_DICTIONARY))
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{
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const PDFObject& viewerPreferencesObject = document->getObject(dictionary->get(PDF_VIEWER_PREFERENCES_DICTIONARY));
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if (viewerPreferencesObject.isDictionary())
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{
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// Load the viewer preferences object
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const PDFDictionary* viewerPreferencesDictionary = viewerPreferencesObject.getDictionary();
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auto addFlag = [&result, viewerPreferencesDictionary, document] (const char* name, OptionFlag flag)
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{
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const PDFObject& flagObject = document->getObject(viewerPreferencesDictionary->get(name));
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if (!flagObject.isNull())
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{
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if (flagObject.isBool())
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{
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result.m_optionFlags.setFlag(flag, flagObject.getBool());
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}
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else
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{
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throw PDFParserException(PDFTranslationContext::tr("Expected boolean value."));
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}
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}
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};
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addFlag(PDF_VIEWER_PREFERENCES_HIDE_TOOLBAR, HideToolbar);
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addFlag(PDF_VIEWER_PREFERENCES_HIDE_MENUBAR, HideMenubar);
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addFlag(PDF_VIEWER_PREFERENCES_HIDE_WINDOW_UI, HideWindowUI);
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addFlag(PDF_VIEWER_PREFERENCES_FIT_WINDOW, FitWindow);
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addFlag(PDF_VIEWER_PREFERENCES_CENTER_WINDOW, CenterWindow);
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addFlag(PDF_VIEWER_PREFERENCES_DISPLAY_DOCUMENT_TITLE, DisplayDocTitle);
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addFlag(PDF_VIEWER_PREFERENCES_PICK_TRAY_BY_PDF_SIZE, PickTrayByPDFSize);
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// Non-fullscreen page mode
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const PDFObject& nonFullscreenPageMode = document->getObject(viewerPreferencesDictionary->get(PDF_VIEWER_PREFERENCES_NON_FULLSCREEN_PAGE_MODE));
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if (!nonFullscreenPageMode.isNull())
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{
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if (!nonFullscreenPageMode.isName())
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{
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throw PDFParserException(PDFTranslationContext::tr("Expected name."));
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}
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QByteArray enumName = nonFullscreenPageMode.getString();
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if (enumName == "UseNone")
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{
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result.m_nonFullScreenPageMode = NonFullScreenPageMode::UseNone;
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}
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else if (enumName == "UseOutlines")
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{
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result.m_nonFullScreenPageMode = NonFullScreenPageMode::UseOutline;
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}
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else if (enumName == "UseThumbs")
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{
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result.m_nonFullScreenPageMode = NonFullScreenPageMode::UseThumbnails;
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}
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else if (enumName == "UseOC")
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{
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result.m_nonFullScreenPageMode = NonFullScreenPageMode::UseOptionalContent;
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}
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else
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{
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throw PDFParserException(PDFTranslationContext::tr("Unknown viewer preferences settings."));
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}
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}
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// Direction
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const PDFObject& direction = document->getObject(viewerPreferencesDictionary->get(PDF_VIEWER_PREFERENCES_DIRECTION));
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if (!direction.isNull())
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{
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if (!direction.isName())
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{
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throw PDFParserException(PDFTranslationContext::tr("Expected name."));
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}
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QByteArray enumName = direction.getString();
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if (enumName == "L2R")
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{
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result.m_direction = Direction::LeftToRight;
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}
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else if (enumName == "R2L")
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{
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result.m_direction = Direction::RightToLeft;
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}
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else
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{
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throw PDFParserException(PDFTranslationContext::tr("Unknown viewer preferences settings."));
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}
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}
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auto addProperty = [&result, viewerPreferencesDictionary, document] (const char* name, Properties property)
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{
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const PDFObject& propertyObject = document->getObject(viewerPreferencesDictionary->get(name));
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if (!propertyObject.isNull())
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{
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if (propertyObject.isName())
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{
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result.m_properties[property] = propertyObject.getString();
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}
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else
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{
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throw PDFParserException(PDFTranslationContext::tr("Expected name."));
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}
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}
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};
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addProperty(PDF_VIEWER_PREFERENCES_VIEW_AREA, ViewArea);
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addProperty(PDF_VIEWER_PREFERENCES_VIEW_CLIP, ViewClip);
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addProperty(PDF_VIEWER_PREFERENCES_PRINT_AREA, PrintArea);
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addProperty(PDF_VIEWER_PREFERENCES_PRINT_CLIP, PrintClip);
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// Print scaling
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const PDFObject& printScaling = document->getObject(viewerPreferencesDictionary->get(PDF_VIEWER_PREFERENCES_PRINT_SCALING));
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if (!printScaling.isNull())
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{
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if (!printScaling.isName())
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{
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throw PDFParserException(PDFTranslationContext::tr("Expected name."));
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}
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QByteArray enumName = printScaling.getString();
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if (enumName == "None")
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{
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result.m_printScaling = PrintScaling::None;
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}
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else if (enumName == "AppDefault")
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{
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result.m_printScaling = PrintScaling::AppDefault;
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}
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else
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{
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throw PDFParserException(PDFTranslationContext::tr("Unknown viewer preferences settings."));
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}
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}
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// Duplex
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const PDFObject& duplex = document->getObject(viewerPreferencesDictionary->get(PDF_VIEWER_PREFERENCES_DUPLEX));
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if (!duplex.isNull())
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{
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if (!duplex.isName())
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{
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throw PDFParserException(PDFTranslationContext::tr("Expected name."));
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}
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QByteArray enumName = duplex.getString();
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if (enumName == "Simplex")
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{
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result.m_duplex = Duplex::Simplex;
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}
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else if (enumName == "DuplexFlipShortEdge")
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{
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result.m_duplex = Duplex::DuplexFlipShortEdge;
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}
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else if (enumName == "DuplexFlipLongEdge")
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{
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result.m_duplex = Duplex::DuplexFlipLongEdge;
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}
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else
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{
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throw PDFParserException(PDFTranslationContext::tr("Unknown viewer preferences settings."));
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}
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}
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// Print page range
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const PDFObject& printPageRange = document->getObject(viewerPreferencesDictionary->get(PDF_VIEWER_PREFERENCES_PRINT_PAGE_RANGE));
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if (!printPageRange.isNull())
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{
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if (!duplex.isArray())
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{
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throw PDFParserException(PDFTranslationContext::tr("Expected array of integers."));
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}
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// According to PDF Reference 1.7, this entry is ignored in following cases:
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// 1) Array size is odd
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// 2) Array contains negative numbers
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//
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// But what should we do, if we get 0? Pages in the PDF file are numbered from 1.
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// So if this situation occur, we also ignore the entry.
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const PDFArray* array = duplex.getArray();
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const size_t count = array->getCount();
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if (count % 2 == 0 && count > 0)
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{
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bool badPageNumber = false;
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int scanned = 0;
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PDFInteger start = -1;
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for (size_t i = 0; i < count; ++i)
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{
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const PDFObject& number = document->getObject(array->getItem(i));
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if (number.isInt())
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{
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PDFInteger current = number.getInteger();
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if (current <= 0)
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{
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badPageNumber = true;
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break;
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}
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switch (scanned++)
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{
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case 0:
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{
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start = current;
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break;
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}
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case 1:
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{
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scanned = 0;
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result.m_printPageRanges.emplace_back(start, current);
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break;
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}
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default:
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Q_ASSERT(false);
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}
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}
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else
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{
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throw PDFParserException(PDFTranslationContext::tr("Expected integer."));
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}
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}
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// Did we get negative or zero value? If yes, clear the range.
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if (badPageNumber)
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{
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result.m_printPageRanges.clear();
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}
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}
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}
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// Number of copies
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const PDFObject& numberOfCopies = document->getObject(viewerPreferencesDictionary->get(PDF_VIEWER_PREFERENCES_NUMBER_OF_COPIES));
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if (!numberOfCopies.isNull())
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{
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if (numberOfCopies.isInt())
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{
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result.m_numberOfCopies = numberOfCopies.getInteger();
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}
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else
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{
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throw PDFParserException(PDFTranslationContext::tr("Expected integer."));
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}
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}
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}
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else if (!viewerPreferencesObject.isNull())
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{
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throw PDFParserException(PDFTranslationContext::tr("Viewer preferences must be a dictionary."));
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}
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}
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return result;
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}
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} // namespace pdf
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