1 | /* |
2 | SPDX-FileCopyrightText: 2022 Kai Uwe Broulik <kde@broulik.de> |
3 | |
4 | SPDX-License-Identifier: LGPL-2.1-or-later |
5 | */ |
6 | |
7 | #include "pngextractor.h" |
8 | #include "propertyinfo.h" |
9 | |
10 | #include <QImageReader> |
11 | |
12 | using namespace KFileMetaData; |
13 | |
14 | // Keywords specified in https://www.w3.org/TR/PNG/#11keywords |
15 | static const struct { |
16 | QString key; |
17 | Property::Property property; |
18 | } s_textMapping[] = { |
19 | // Short (one line) title or caption for image |
20 | {QStringLiteral("Title" ), .property: Property::Title}, |
21 | // Name of image's creator |
22 | {QStringLiteral("Author" ), .property: Property::Author}, |
23 | // Description of image (possibly long) |
24 | // Unfortunately, QImage puts all text keys with spaces, such as |
25 | // "Raw profile type exif", into the "Description" key, |
26 | // (cf. qt_getImageTextFromDescription), overriding the actual |
27 | // PNG description, and making it useless. |
28 | //{QStringLiteral("Description"), Property::Description}, |
29 | // Copyright notice |
30 | {QStringLiteral("Copyright" ), .property: Property::Copyright}, |
31 | // Time of original image creation |
32 | {QStringLiteral("Creation Time" ), .property: Property::CreationDate}, |
33 | // Software used to create the image |
34 | {QStringLiteral("Software" ), .property: Property::Generator}, |
35 | // Disclaimer - Legal disclaimer |
36 | // Warning - Warning of nature of content |
37 | // Source - Device used to create the image |
38 | // Miscellaneous comment |
39 | {QStringLiteral("Comment" ), .property: Property::Comment}, |
40 | }; |
41 | |
42 | PngExtractor::(QObject* parent) |
43 | : ExtractorPlugin(parent) |
44 | { |
45 | } |
46 | |
47 | QStringList PngExtractor::() const |
48 | { |
49 | return { |
50 | QStringLiteral("image/png" ) |
51 | }; |
52 | } |
53 | |
54 | void PngExtractor::(ExtractionResult* result) |
55 | { |
56 | QImageReader reader(result->inputUrl(), "png" ); |
57 | if (!reader.canRead()) { |
58 | return; |
59 | } |
60 | |
61 | result->addType(type: Type::Image); |
62 | |
63 | if (!result->inputFlags().testFlag(flag: ExtractionResult::ExtractMetaData)) { |
64 | return; |
65 | } |
66 | |
67 | for (const auto &mapping : s_textMapping) { |
68 | QString text = reader.text(key: mapping.key); |
69 | if (text.isEmpty()) { |
70 | // Spec says, keywords are case-sensitive but of course the real world looks different. |
71 | text = reader.text(key: mapping.key.toLower()); |
72 | } |
73 | if (text.isEmpty()) { |
74 | continue; |
75 | } |
76 | |
77 | const auto propertyInfo = PropertyInfo(mapping.property); |
78 | |
79 | if (propertyInfo.valueType() == QMetaType::QDateTime) { |
80 | // "For the Creation Time keyword, the date format defined in section 5.2.14 of RFC 1123 is suggested" |
81 | // which in turn references RFC822... |
82 | const QDateTime dt = QDateTime::fromString(string: text, format: Qt::RFC2822Date); |
83 | |
84 | if (!dt.isValid()) { |
85 | continue; |
86 | } |
87 | |
88 | result->add(property: mapping.property, value: dt); |
89 | continue; |
90 | } |
91 | |
92 | result->add(property: mapping.property, value: text); |
93 | } |
94 | } |
95 | |
96 | #include "moc_pngextractor.cpp" |
97 | |