KFileMetaData

postscriptdscextractor.cpp
1/*
2 SPDX-FileCopyrightText: 2018 Stefan BrĂ¼ns <stefan.bruens@rwth-aachen.de>
3
4 SPDX-License-Identifier: LGPL-2.1-or-later
5*/
6
7
8#include "postscriptdscextractor.h"
9#include "kfilemetadata_debug.h"
10
11#include <QFile>
12#include <QTimeZone>
13
14namespace KFileMetaData
15{
16
17DscExtractor::DscExtractor(QObject* parent)
18 : ExtractorPlugin(parent)
19{
20
21}
22
23QStringList DscExtractor::mimetypes() const
24{
26 list << QStringLiteral("application/postscript")
27 << QStringLiteral("image/x-eps");
28
29 return list;
30}
31
32void DscExtractor::extract(ExtractionResult* result)
33{
34 QFile file(result->inputUrl());
35 if (!file.open(QIODevice::ReadOnly)) {
36 qCWarning(KFILEMETADATA_LOG) << "Document is not a valid file";
37 return;
38 }
39
40 // A little bit heuristic - assume EPS files are images, PS complete documents
41 if (result->inputMimetype() == QLatin1String("application/postscript")) {
42 result->addType(Type::Document);
43 } else {
44 result->addType(Type::Image);
45 }
46
47 if (!(result->inputFlags() & ExtractionResult::ExtractMetaData)) {
48 return;
49 }
50 // Try to find some DSC (PostScript Language Document Structuring Conventions) conforming data
51 QTextStream stream(&file);
52 QString line;
53
54 while (stream.readLineInto(&line)) {
55 if (!line.startsWith(QLatin1String("%%"))) {
56 continue;
57 }
58
59 if (const auto tag = QLatin1String("%%Pages:"); line.startsWith(tag)) {
60 bool ok = false;
61 int pages = QStringView(line).mid(tag.size()).toInt(&ok, 10);
62 if (ok) {
63 result->add(Property::PageCount, pages);
64 }
65
66 } else if (const auto tag = QLatin1String("%%Title:"); line.startsWith(tag)) {
67 QStringView title = QStringView(line).mid(tag.size()).trimmed();
68 if (title.startsWith(QLatin1Char('(')) && title.endsWith(QLatin1Char(')'))) {
69 title = title.mid(1, title.size() - 2);
70 }
71 if (!title.isEmpty()) {
72 result->add(Property::Title, title.toString());
73 }
74
75 } else if (const auto tag = QLatin1String("%%CreationDate:"); line.startsWith(tag)) {
76 // "Neither the date nor time need be in any standard format."
77 QStringView date = QStringView(line).mid(tag.size()).trimmed();
78 if (date.startsWith(QLatin1Char('(')) && date.endsWith(QLatin1Char(')'))) {
79 date = date.mid(1, date.size() - 2);
80 date = date.trimmed();
81 }
82 if (date.startsWith(QLatin1String("D:")) && date.size() >= 23) {
83 // Standard PDF date format, ASN.1 like - (D:YYYYMMDDHHmmSSOHH'mm')
84 auto dt = QDateTime::fromString(date.mid(2, 14).toString(), QLatin1String("yyyyMMddhhmmss"));
85 auto offset = QTime::fromString(date.mid(17, 5).toString(), QLatin1String("hh'\\''mm"));
86 if (date.at(16) == QLatin1Char('+')) {
87 dt.setTimeZone(QTimeZone::fromSecondsAheadOfUtc(QTime(0, 0).secsTo(offset)));
88 } else {
89 dt.setTimeZone(QTimeZone::fromSecondsAheadOfUtc(-1 * QTime(0, 0).secsTo(offset)));
90 }
91 result->add(Property::CreationDate, dt);
92 } else {
93 auto dt = QDateTime::fromString(date.toString());
94 if (dt.isValid()) {
95 result->add(Property::CreationDate, dt);
96 }
97 }
98
99 } else if (line.startsWith(QLatin1String("%%EndComments"))) {
100 break;
101 }
102 }
103}
104
105} // namespace KFileMetaData
106
107#include "moc_postscriptdscextractor.cpp"
The KFileMetaData namespace.
KIOCORE_EXPORT QStringList list(const QString &fileClass)
QDateTime fromString(QStringView string, QStringView format, QCalendar cal)
bool startsWith(QChar c, Qt::CaseSensitivity cs) const const
QStringView mid(qsizetype start, qsizetype length) const const
QChar at(qsizetype n) const const
bool endsWith(QChar ch) const const
bool isEmpty() const const
qsizetype size() const const
bool startsWith(QChar ch) const const
int toInt(bool *ok, int base) const const
QString toString() const const
QStringView trimmed() const const
QTime fromString(QStringView string, QStringView format)
QTimeZone fromSecondsAheadOfUtc(int offset)
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