File indexing completed on 2024-05-12 15:37:06

 /*
     SPDX-FileCopyrightText: 2022 Kai Uwe Broulik <kde@broulik.de>
 
     SPDX-License-Identifier: LGPL-2.1-or-later
 */
 
 #include "pngextractor.h"
 #include "propertyinfo.h"
 
 #include <QImageReader>
 
 using namespace KFileMetaData;
 
 // Keywords specified in https://www.w3.org/TR/PNG/#11keywords
 static const struct {
     QString key;
     Property::Property property;
 } s_textMapping[] = {
     // Short (one line) title or caption for image
     {QStringLiteral("Title"), Property::Title},
     // Name of image's creator
     {QStringLiteral("Author"), Property::Author},
     // Description of image (possibly long)
     // Unfortunately, QImage puts all text keys with spaces, such as
     // "Raw profile type exif", into the "Description" key,
     // (cf. qt_getImageTextFromDescription), overriding the actual
     // PNG description, and making it useless.
     //{QStringLiteral("Description"), Property::Description},
     // Copyright notice
     {QStringLiteral("Copyright"), Property::Copyright},
     // Time of original image creation
     {QStringLiteral("Creation Time"), Property::CreationDate},
     // Software used to create the image
     {QStringLiteral("Software"), Property::Generator},
     // Disclaimer - Legal disclaimer
     // Warning - Warning of nature of content
     // Source - Device used to create the image
     // Miscellaneous comment
     {QStringLiteral("Comment"), Property::Comment},
 };
 
 PngExtractor::PngExtractor(QObject* parent)
     : ExtractorPlugin(parent)
 {
 }
 
 QStringList PngExtractor::mimetypes() const
 {
     return {
         QStringLiteral("image/png")
     };
 }
 
 void PngExtractor::extract(ExtractionResult* result)
 {
     QImageReader reader(result->inputUrl(), "png");
     if (!reader.canRead()) {
         return;
     }
 
     result->addType(Type::Image);
 
     if (!result->inputFlags().testFlag(ExtractionResult::ExtractMetaData)) {
         return;
     }
 
     for (const auto &mapping : s_textMapping) {
         QString text = reader.text(mapping.key);
         if (text.isEmpty()) {
             // Spec says, keywords are case-sensitive but of course the real world looks different.
             text = reader.text(mapping.key.toLower());
         }
         if (text.isEmpty()) {
             continue;
         }
 
         const auto propertyInfo = PropertyInfo(mapping.property);
 
         if (propertyInfo.valueType() == QVariant::DateTime) {
             // "For the Creation Time keyword, the date format defined in section 5.2.14 of RFC 1123 is suggested"
             // which in turn references RFC822...
             const QDateTime dt = QDateTime::fromString(text, Qt::RFC2822Date);
 
             if (!dt.isValid()) {
                 continue;
             }
 
             result->add(mapping.property, dt);
             continue;
         }
 
         result->add(mapping.property, text);
     }
 }
 
 #include "moc_pngextractor.cpp"