1// Copyright (C) 2016 The Qt Company Ltd.
2// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
3// Qt-Security score:significant reason:default
4
5#ifndef QTEMPORARYFILE_P_H
6#define QTEMPORARYFILE_P_H
7
8//
9// W A R N I N G
10// -------------
11//
12// This file is not part of the Qt API. It exists purely as an
13// implementation detail. This header file may change from version to
14// version without notice, or even be removed.
15//
16// We mean it.
17//
18
19#include <QtCore/qglobal.h>
20
21#include "private/qfsfileengine_p.h"
22#include "private/qfilesystemengine_p.h"
23#include "private/qfile_p.h"
24#include "qtemporaryfile.h"
25
26#if defined(Q_OS_LINUX) && QT_CONFIG(linkat)
27# include <fcntl.h>
28# ifdef O_TMPFILE
29// some early libc support had the wrong values for O_TMPFILE
30// (see https://bugzilla.gnome.org/show_bug.cgi?id=769453#c18)
31# if (O_TMPFILE & O_DIRECTORY) == O_DIRECTORY
32# define LINUX_UNNAMED_TMPFILE
33# endif
34# endif
35#endif
36
37QT_BEGIN_NAMESPACE
38
39struct QTemporaryFileName
40{
41 QFileSystemEntry::NativePath path;
42 qsizetype pos;
43 qsizetype length;
44
45 QTemporaryFileName(const QString &templateName);
46 QFileSystemEntry::NativePath generateNext();
47};
48
49#if QT_CONFIG(temporaryfile)
50
51class QTemporaryFilePrivate : public QFilePrivate
52{
53 Q_DECLARE_PUBLIC(QTemporaryFile)
54
55public:
56 QTemporaryFilePrivate();
57 explicit QTemporaryFilePrivate(const QString &templateNameIn);
58 ~QTemporaryFilePrivate();
59
60 bool rename(const QString &newName, bool overwrite);
61
62 QAbstractFileEngine *engine() const override;
63 void resetFileEngine() const;
64 void materializeUnnamedFile();
65
66 bool autoRemove = true;
67 QString templateName = defaultTemplateName();
68
69 static QString defaultTemplateName();
70
71 friend class QLockFilePrivate;
72};
73
74class QTemporaryFileEngine : public QFSFileEngine
75{
76 Q_DECLARE_PRIVATE(QFSFileEngine)
77public:
78 enum Flags { Win32NonShared = 0x1 };
79
80 explicit QTemporaryFileEngine(const QString *_templateName, int _flags = 0)
81 : templateName(*_templateName), flags(_flags)
82 {}
83
84 void initialize(const QString &file, quint32 mode, bool nameIsTemplate = true)
85 {
86 Q_D(QFSFileEngine);
87 Q_ASSERT(!isReallyOpen());
88 fileMode = mode;
89 filePathIsTemplate = filePathWasTemplate = nameIsTemplate;
90
91 if (filePathIsTemplate) {
92 d->fileEntry.clear();
93 } else {
94 QFSFileEngine::setFileEntry(QFileSystemEntry(file));
95 }
96 }
97 ~QTemporaryFileEngine();
98
99 bool isReallyOpen() const;
100 void setFileName(const QString &file) override;
101
102 bool open(QIODevice::OpenMode flags, std::optional<QFile::Permissions> permissions) override;
103 bool remove() override;
104 bool rename(const QString &newName) override;
105 bool renameOverwrite(const QString &newName) override;
106 bool close() override;
107 QString fileName(FileName file) const override;
108
109 enum MaterializationMode { Overwrite, DontOverwrite, NameIsTemplate };
110 bool materializeUnnamedFile(const QString &newName, MaterializationMode mode);
111 bool isUnnamedFile() const override final;
112
113 const QString &templateName;
114 quint32 fileMode = 0;
115 int flags = 0;
116 bool filePathIsTemplate = true;
117 bool filePathWasTemplate = true;
118 bool unnamedFile = false;
119};
120
121#endif // QT_CONFIG(temporaryfile)
122
123QT_END_NAMESPACE
124
125#endif /* QTEMPORARYFILE_P_H */
126
127

source code of qtbase/src/corelib/io/qtemporaryfile_p.h