File indexing completed on 2024-05-19 03:56:45

 /*
     SPDX-FileCopyrightText: 2018 Stefan Brüns <stefan.bruens@rwth-aachen.de>
 
     SPDX-License-Identifier: LGPL-2.1-or-later
 */
 
 
 #include "postscriptdscextractor.h"
 #include "kfilemetadata_debug.h"
 
 #include <QFile>
 #include <QTimeZone>
 
 namespace KFileMetaData
 {
 
 DscExtractor::DscExtractor(QObject* parent)
     : ExtractorPlugin(parent)
 {
 
 }
 
 QStringList DscExtractor::mimetypes() const
 {
     QStringList list;
     list << QStringLiteral("application/postscript")
          << QStringLiteral("image/x-eps");
 
     return list;
 }
 
 void DscExtractor::extract(ExtractionResult* result)
 {
     QFile file(result->inputUrl());
     if (!file.open(QIODevice::ReadOnly)) {
         qCWarning(KFILEMETADATA_LOG) << "Document is not a valid file";
         return;
     }
 
     // A little bit heuristic - assume EPS files are images, PS complete documents
     if (result->inputMimetype() == QLatin1String("application/postscript")) {
         result->addType(Type::Document);
     } else {
         result->addType(Type::Image);
     }
 
     if (!(result->inputFlags() & ExtractionResult::ExtractMetaData)) {
         return;
     }
     // Try to find some DSC (PostScript Language Document Structuring Conventions) conforming data
     QTextStream stream(&file);
     QString line;
 
     while (stream.readLineInto(&line)) {
         if (!line.startsWith(QLatin1String("%%"))) {
             continue;
         }
 
         if (const auto tag = QLatin1String("%%Pages:"); line.startsWith(tag)) {
             bool ok = false;
             int pages = QStringView(line).mid(tag.size()).toInt(&ok, 10);
             if (ok) {
                 result->add(Property::PageCount, pages);
             }
 
         } else if (const auto tag = QLatin1String("%%Title:"); line.startsWith(tag)) {
             QStringView title = QStringView(line).mid(tag.size()).trimmed();
             if (title.startsWith(QLatin1Char('(')) && title.endsWith(QLatin1Char(')'))) {
                 title = title.mid(1, title.size() - 2);
             }
             if (!title.isEmpty()) {
                 result->add(Property::Title, title.toString());
             }
 
         } else if (const auto tag = QLatin1String("%%CreationDate:"); line.startsWith(tag)) {
             // "Neither the date nor time need be in any standard format."
             QStringView date = QStringView(line).mid(tag.size()).trimmed();
             if (date.startsWith(QLatin1Char('(')) && date.endsWith(QLatin1Char(')'))) {
                 date = date.mid(1, date.size() - 2);
                 date = date.trimmed();
             }
             if (date.startsWith(QLatin1String("D:")) && date.size() >= 23) {
                 // Standard PDF date format, ASN.1 like - (D:YYYYMMDDHHmmSSOHH'mm')
                 auto dt = QDateTime::fromString(date.mid(2, 14).toString(), QLatin1String("yyyyMMddhhmmss"));
                 auto offset = QTime::fromString(date.mid(17, 5).toString(), QLatin1String("hh'\\''mm"));
                 if (date.at(16) == QLatin1Char('+')) {
                     dt.setTimeZone(QTimeZone::fromSecondsAheadOfUtc(QTime(0, 0).secsTo(offset)));
                 } else {
                     dt.setTimeZone(QTimeZone::fromSecondsAheadOfUtc(-1 * QTime(0, 0).secsTo(offset)));
                 }
                 result->add(Property::CreationDate, dt);
             } else {
                 auto dt = QDateTime::fromString(date.toString());
                 if (dt.isValid()) {
                     result->add(Property::CreationDate, dt);
                 }
             }
 
         } else if (line.startsWith(QLatin1String("%%EndComments"))) {
             break;
         }
     }
 }
 
 } // namespace KFileMetaData
 
 #include "moc_postscriptdscextractor.cpp"