mirror of
https://github.com/JakubMelka/PDF4QT.git
synced 2024-12-29 09:40:26 +01:00
361 lines
13 KiB
C++
361 lines
13 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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#include "pdfdocument.h"
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#include "pdfparser.h"
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#include "pdfencoding.h"
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#include "pdfstreamfilters.h"
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#include "pdfconstants.h"
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namespace pdf
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{
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// Entries for "Info" entry in trailer dictionary
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static constexpr const char* PDF_DOCUMENT_INFO_ENTRY = "Info";
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static constexpr const char* PDF_DOCUMENT_INFO_ENTRY_TITLE = "Title";
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static constexpr const char* PDF_DOCUMENT_INFO_ENTRY_AUTHOR = "Author";
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static constexpr const char* PDF_DOCUMENT_INFO_ENTRY_SUBJECT = "Subject";
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static constexpr const char* PDF_DOCUMENT_INFO_ENTRY_KEYWORDS = "Keywords";
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static constexpr const char* PDF_DOCUMENT_INFO_ENTRY_CREATOR = "Creator";
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static constexpr const char* PDF_DOCUMENT_INFO_ENTRY_PRODUCER = "Producer";
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static constexpr const char* PDF_DOCUMENT_INFO_ENTRY_CREATION_DATE = "CreationDate";
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static constexpr const char* PDF_DOCUMENT_INFO_ENTRY_MODIFIED_DATE = "ModDate";
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static constexpr const char* PDF_DOCUMENT_INFO_ENTRY_TRAPPED = "Trapped";
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static constexpr const char* PDF_DOCUMENT_INFO_ENTRY_TRAPPED_TRUE = "True";
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static constexpr const char* PDF_DOCUMENT_INFO_ENTRY_TRAPPED_FALSE = "False";
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static constexpr const char* PDF_DOCUMENT_INFO_ENTRY_TRAPPED_UNKNOWN = "Unknown";
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QByteArray PDFDocument::getDecodedStream(const PDFStream* stream) const
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{
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const PDFDictionary* dictionary = stream->getDictionary();
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// Retrieve filters
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PDFObject filters;
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if (dictionary->hasKey(PDF_STREAM_DICT_FILTER))
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{
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filters = getObject(dictionary->get(PDF_STREAM_DICT_FILTER));
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}
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else if (dictionary->hasKey(PDF_STREAM_DICT_FILE_FILTER))
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{
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filters = getObject(dictionary->get(PDF_STREAM_DICT_FILE_FILTER));
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}
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// Retrieve filter parameters
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PDFObject filterParameters;
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if (dictionary->hasKey(PDF_STREAM_DICT_DECODE_PARMS))
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{
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filterParameters = getObject(dictionary->get(PDF_STREAM_DICT_DECODE_PARMS));
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}
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else if (dictionary->hasKey(PDF_STREAM_DICT_FDECODE_PARMS))
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{
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filterParameters = getObject(dictionary->get(PDF_STREAM_DICT_FDECODE_PARMS));
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}
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std::vector<const PDFStreamFilter*> filterObjects;
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std::vector<PDFObject> filterParameterObjects;
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if (filters.isName())
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{
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filterObjects.push_back(PDFStreamFilterStorage::getFilter(filters.getString()));
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}
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else if (filters.isArray())
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{
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const PDFArray* filterArray = filters.getArray();
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const size_t filterCount = filterArray->getCount();
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for (size_t i = 0; i < filterCount; ++i)
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{
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const PDFObject& object = getObject(filterArray->getItem(i));
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if (object.isName())
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{
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filterObjects.push_back(PDFStreamFilterStorage::getFilter(object.getString()));
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}
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else
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{
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return QByteArray();
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}
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}
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}
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else if (!filters.isNull())
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{
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return QByteArray();
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}
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if (filterParameters.isArray())
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{
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const PDFArray* filterParameterArray = filterParameters.getArray();
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const size_t filterParameterCount = filterParameterArray->getCount();
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for (size_t i = 0; i < filterParameterCount; ++i)
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{
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const PDFObject& object = getObject(filterParameterArray->getItem(i));
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filterParameterObjects.push_back(object);
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}
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}
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else
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{
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filterParameterObjects.push_back(filterParameters);
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}
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filterParameterObjects.resize(filterObjects.size());
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std::reverse(filterObjects.begin(), filterObjects.end());
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std::reverse(filterParameterObjects.begin(), filterParameterObjects.end());
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QByteArray result = *stream->getContent();
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for (size_t i = 0, count = filterObjects.size(); i < count; ++i)
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{
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const PDFStreamFilter* streamFilter = filterObjects[i];
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const PDFObject& streamFilterParameters = filterParameterObjects[i];
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if (streamFilter)
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{
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result = streamFilter->apply(result, this, streamFilterParameters);
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}
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}
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return result;
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}
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void PDFDocument::init()
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{
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initInfo();
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const PDFObject& trailerDictionary = m_pdfObjectStorage.getTrailerDictionary();
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// Trailer object should be dictionary here. It is verified in the document reader.
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Q_ASSERT(trailerDictionary.isDictionary());
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const PDFDictionary* dictionary = trailerDictionary.getDictionary();
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Q_ASSERT(dictionary);
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m_catalog = PDFCatalog::parse(getObject(dictionary->get("Root")), this);
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}
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void PDFDocument::initInfo()
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{
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const PDFObject& trailerDictionary = m_pdfObjectStorage.getTrailerDictionary();
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// Trailer object should be dictionary here. It is verified in the document reader.
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Q_ASSERT(trailerDictionary.isDictionary());
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const PDFDictionary* dictionary = trailerDictionary.getDictionary();
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Q_ASSERT(dictionary);
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if (dictionary->hasKey(PDF_DOCUMENT_INFO_ENTRY))
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{
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const PDFObject& info = getObject(dictionary->get(PDF_DOCUMENT_INFO_ENTRY));
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if (info.isDictionary())
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{
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const PDFDictionary* infoDictionary = info.getDictionary();
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Q_ASSERT(infoDictionary);
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auto readTextString = [this, infoDictionary](const char* entry, QString& fillEntry)
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{
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if (infoDictionary->hasKey(entry))
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{
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const PDFObject& stringObject = getObject(infoDictionary->get(entry));
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if (stringObject.isString())
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{
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// We have succesfully read the string, convert it according to encoding
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fillEntry = PDFEncoding::convertTextString(stringObject.getString());
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}
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else if (!stringObject.isNull())
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{
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throw PDFParserException(tr("Bad format of document info entry in trailer dictionary. String expected."));
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}
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}
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};
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readTextString(PDF_DOCUMENT_INFO_ENTRY_TITLE, m_info.title);
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readTextString(PDF_DOCUMENT_INFO_ENTRY_AUTHOR, m_info.author);
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readTextString(PDF_DOCUMENT_INFO_ENTRY_SUBJECT, m_info.subject);
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readTextString(PDF_DOCUMENT_INFO_ENTRY_KEYWORDS, m_info.keywords);
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readTextString(PDF_DOCUMENT_INFO_ENTRY_CREATOR, m_info.creator);
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readTextString(PDF_DOCUMENT_INFO_ENTRY_PRODUCER, m_info.producer);
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auto readDate= [this, infoDictionary](const char* entry, QDateTime& fillEntry)
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{
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if (infoDictionary->hasKey(entry))
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{
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const PDFObject& stringObject = getObject(infoDictionary->get(entry));
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if (stringObject.isString())
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{
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// We have succesfully read the string, convert it to date time
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fillEntry = PDFEncoding::convertToDateTime(stringObject.getString());
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if (!fillEntry.isValid())
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{
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throw PDFParserException(tr("Bad format of document info entry in trailer dictionary. String with date time format expected."));
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}
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}
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else if (!stringObject.isNull())
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{
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throw PDFParserException(tr("Bad format of document info entry in trailer dictionary. String with date time format expected."));
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}
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}
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};
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readDate(PDF_DOCUMENT_INFO_ENTRY_CREATION_DATE, m_info.creationDate);
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readDate(PDF_DOCUMENT_INFO_ENTRY_MODIFIED_DATE, m_info.modifiedDate);
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if (infoDictionary->hasKey(PDF_DOCUMENT_INFO_ENTRY_TRAPPED))
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{
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const PDFObject& nameObject = getObject(infoDictionary->get(PDF_DOCUMENT_INFO_ENTRY_TRAPPED));
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if (nameObject.isName())
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{
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const QByteArray& name = nameObject.getString();
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if (name == PDF_DOCUMENT_INFO_ENTRY_TRAPPED_TRUE)
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{
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m_info.trapped = Info::Trapped::True;
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}
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else if (name == PDF_DOCUMENT_INFO_ENTRY_TRAPPED_FALSE)
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{
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m_info.trapped = Info::Trapped::False;
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}
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else if (name == PDF_DOCUMENT_INFO_ENTRY_TRAPPED_UNKNOWN)
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{
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m_info.trapped = Info::Trapped::Unknown;
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}
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else
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{
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throw PDFParserException(tr("Bad format of document info entry in trailer dictionary. Trapping information expected"));
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}
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}
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else
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{
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throw PDFParserException(tr("Bad format of document info entry in trailer dictionary. Trapping information expected"));
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}
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}
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}
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else if (!info.isNull()) // Info may be invalid...
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{
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throw PDFParserException(tr("Bad format of document info entry in trailer dictionary."));
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}
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}
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}
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const PDFObject& PDFObjectStorage::getObject(PDFObjectReference reference) const
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{
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if (reference.objectNumber >= 0 &&
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reference.objectNumber < static_cast<PDFInteger>(m_objects.size()) &&
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m_objects[reference.objectNumber].generation == reference.generation)
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{
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return m_objects[reference.objectNumber].object;
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}
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else
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{
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static const PDFObject dummy;
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return dummy;
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}
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}
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PDFInteger PDFDocumentDataLoaderDecorator::readInteger(const PDFObject& object, PDFInteger defaultValue) const
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{
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const PDFObject& dereferencedObject = m_document->getObject(object);
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if (dereferencedObject.isInt())
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{
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return dereferencedObject.getInteger();
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}
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return defaultValue;
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}
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PDFReal PDFDocumentDataLoaderDecorator::readNumber(const PDFObject& object, PDFInteger defaultValue) const
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{
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const PDFObject& dereferencedObject = m_document->getObject(object);
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if (dereferencedObject.isReal())
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{
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return dereferencedObject.getReal();
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} else if (dereferencedObject.isInt())
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{
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return dereferencedObject.getInteger();
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}
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return defaultValue;
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}
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QString PDFDocumentDataLoaderDecorator::readTextString(const PDFObject& object, const QString& defaultValue) const
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{
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const PDFObject& dereferencedObject = m_document->getObject(object);
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if (dereferencedObject.isString())
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{
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return PDFEncoding::convertTextString(dereferencedObject.getString());
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}
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return defaultValue;
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}
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QRectF PDFDocumentDataLoaderDecorator::readRectangle(const PDFObject& object, const QRectF& defaultValue) const
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{
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const PDFObject& dereferencedObject = m_document->getObject(object);
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if (dereferencedObject.isArray())
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{
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const PDFArray* array = dereferencedObject.getArray();
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if (array->getCount() == 4)
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{
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std::array<PDFReal, 4> items;
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for (size_t i = 0; i < 4; ++i)
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{
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const PDFObject& object = m_document->getObject(array->getItem(i));
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if (object.isReal())
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{
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items[i] = object.getReal();
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}
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else if (object.isInt())
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{
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items[i] = object.getInteger();
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}
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else
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{
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return defaultValue;
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}
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}
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const PDFReal xMin = qMin(items[0], items[2]);
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const PDFReal xMax = qMax(items[0], items[2]);
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const PDFReal yMin = qMin(items[1], items[3]);
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const PDFReal yMax = qMax(items[1], items[3]);
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return QRectF(xMin, yMin, xMax - xMin, yMax - yMin);
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}
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}
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return defaultValue;
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}
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PDFReal PDFDocumentDataLoaderDecorator::readNumberFromDictionary(const PDFDictionary* dictionary, const char* key, PDFReal defaultValue) const
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{
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if (dictionary->hasKey(key))
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{
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return readNumber(dictionary->get(key), defaultValue);
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}
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return defaultValue;
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}
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PDFInteger PDFDocumentDataLoaderDecorator::readIntegerFromDictionary(const PDFDictionary* dictionary, const char* key, PDFInteger defaultValue) const
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{
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if (dictionary->hasKey(key))
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{
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return readInteger(dictionary->get(key), defaultValue);
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}
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return defaultValue;
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}
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} // namespace pdf
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