Differential D16498 Diff 44408 src/extractors/postscriptdscextractor.cpp

Changeset View

Standalone View

View Options

src/extractors/postscriptdscextractor.cpp

  • This file was added.
1​/*
2​ Copyright (C) 2018 Stefan Brüns <stefan.bruens@rwth-aachen.de>
3​
4​ This library is free software; you can redistribute it and/or
5​ modify it under the terms of the GNU Lesser General Public
6​ License as published by the Free Software Foundation; either
7​ version 2.1 of the License, or (at your option) any later version.
8​
9​ This library is distributed in the hope that it will be useful,
10​ but WITHOUT ANY WARRANTY; without even the implied warranty of
11​ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12​ Lesser General Public License for more details.
13​
14​ You should have received a copy of the GNU Lesser General Public
15​ License along with this library; if not, write to the Free Software
16​ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17​*/
18​
19​
20​#include "postscriptdscextractor.h"
21​#include "kfilemetadata_debug.h"
22​
23​#include <QDebug>
24​#include <QFile>
25​
26​namespace KFileMetaData
27​{
28​
29​DscExtractor::DscExtractor(QObject* parent)
30​ : ExtractorPlugin(parent)
31​{
32​
33​}
34​
35​QStringList DscExtractor::mimetypes() const
36​{
37​ QStringList list;
38​ list << QStringLiteral("application/postscript")
39​ << QStringLiteral("image/x-eps");
40​
41​ return list;
42​}
43​
44​void DscExtractor::extract(ExtractionResult* result)
45​{
46​ auto flags = result->inputFlags();
47​ if (!(flags & ExtractionResult::ExtractMetaData)) {
48​ return;
49​ }
50​
51​ QFile file(result->inputUrl());
52​ if (!file.open(QIODevice::ReadOnly)) {
53​ qCWarning(KFILEMETADATA_LOG) << "Document is not a valid file";
54​ return;
55​ }
56​
57​ // A little bit heuristic - assume EPS files are images, PS complete documents
58​ if (result->inputMimetype() == QLatin1String("application/postscript")) {
59​ result->addType(Type::Document);
60​ } else {
61​ result->addType(Type::Image);
62​ }
63​
64​ // Try to find some DSC (PostScript Language Document Structuring Conventions) conforming data
65​ QTextStream stream(&file);
66​ QString line;
67​
68​ while (stream.readLineInto(&line)) {
69​ if (!line.startsWith(QLatin1String("%%"))) {
70​ continue;
71​ }
72​
73​ if (line.startsWith(QLatin1String("%%Pages:"))) {
74​ bool ok = false;
75​ int pages = line.midRef(8).toInt(&ok, 10);
76​ if (ok) {
77​ result->add(Property::PageCount, pages);
78​ }
79​
80​ } else if (line.startsWith(QLatin1String("%%Title:"))) {
81​ QStringRef title = line.midRef(8);
82​ title = title.trimmed();
83​ if (title.startsWith(QLatin1Char('(')) && title.endsWith(QLatin1Char(')'))) {
84​ title = title.mid(1, title.size() - 2);
85​ }
86​ if (!title.isEmpty()) {
87​ result->add(Property::Title, title.toString());
88​ }
89​
90​ } else if (line.startsWith(QLatin1String("%%CreationDate:"))) {
91​ // "Neither the date nor time need be in any standard format."
92​ QStringRef date = line.midRef(15);
93​ date = date.trimmed();
94​ if (date.startsWith(QLatin1Char('(')) && date.endsWith(QLatin1Char(')'))) {
95​ date = date.mid(1, date.size() - 2);
96​ date = date.trimmed();
97​ }
98​ if (date.startsWith(QLatin1String("D:")) && date.size() >= 23) {
99​ // Standard PDF date format, ASN.1 like - (D:YYYYMMDDHHmmSSOHH'mm')
100​ auto dt = QDateTime::fromString(date.mid(2, 14).toString(), QLatin1String("yyyyMMddhhmmss"));
101​ auto offset = QTime::fromString(date.mid(17, 5).toString(), QLatin1String("hh'\\''mm"));
102​ if (date.mid(16,1) == QLatin1String("+")) {
103​ dt.setOffsetFromUtc(QTime(0, 0).secsTo(offset));
104​ } else {
105​ dt.setOffsetFromUtc(-1 * QTime(0, 0).secsTo(offset));
106​ }
107​ result->add(Property::CreationDate, dt);
108​ } else {
109​ auto dt = QDateTime::fromString(date.toString());
110​ if (dt.isValid()) {
111​ result->add(Property::CreationDate, dt);
112​ }
113​ }
114​
115​ } else if (line.startsWith(QLatin1String("%%EndComments"))) {
116​ break;
117​ }
118​ }
119​}
120​
121​} // namespace KFileMetaData