1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
|
/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
/*
Sonic Visualiser
An audio file viewer and annotation editor.
Centre for Digital Music, Queen Mary, University of London.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version. See the file
COPYING included with this distribution for more information.
*/
#include "TextTest.h"
#include "base/Debug.h"
#include "base/StringBits.h"
#include <QFile>
#include <QXmlStreamReader>
namespace sv {
bool
TextTest::isApparentTextDocument(FileSource source)
{
// Return true if the document can be opened and contains some
// sort of text, either UTF-8 (so it could be Turtle) or another
// encoding that is recognised as XML
if (!source.isAvailable()) {
SVDEBUG << "NOTE: TextTest::isApparentTextDocument: Failed to retrieve document from " << source.getLocation() << endl;
return false;
}
QFile file(source.getLocalFilename());
if (!file.open(QFile::ReadOnly)) {
SVDEBUG << "NOTE: TextTest::isApparentTextDocument: Failed to open local file from " << source.getLocalFilename() << endl;
return false;
}
QByteArray bytes = file.read(200);
if (StringBits::isValidUtf8(std::string(bytes.data()), true)) {
SVDEBUG << "NOTE: TextTest::isApparentTextDocument: Document appears to be UTF-8" << endl;
return true; // good enough to be worth trying to parse
}
QXmlStreamReader xmlReader(bytes);
bool isApparentXml = true;
if (xmlReader.hasError()) {
isApparentXml = false;
} else if (!xmlReader.atEnd()) {
if (xmlReader.readNext() == QXmlStreamReader::Invalid) {
isApparentXml = false;
}
}
if (isApparentXml) {
SVDEBUG << "NOTE: TextTest::isApparentTextDocument: Document appears to be XML" << endl;
return true;
}
SVDEBUG << "NOTE: TextTest::isApparentTextDocument: Document is not UTF-8 and is not XML, rejecting" << endl;
return false;
}
} // end namespace sv
|
