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39
40#ifndef QTEMPORARYFILE_P_H
41#define QTEMPORARYFILE_P_H
42
43//
44// W A R N I N G
45// -------------
46//
47// This file is not part of the Qt API. It exists purely as an
48// implementation detail. This header file may change from version to
49// version without notice, or even be removed.
50//
51// We mean it.
52//
53
54#include <QtCore/qglobal.h>
55
56#include "private/qfsfileengine_p.h"
57#include "private/qfilesystemengine_p.h"
58#include "private/qfile_p.h"
59#include "qtemporaryfile.h"
60
61#if defined(Q_OS_LINUX) && QT_CONFIG(linkat)
62# include <fcntl.h>
63# ifdef O_TMPFILE
64// some early libc support had the wrong values for O_TMPFILE
65// (see https://bugzilla.gnome.org/show_bug.cgi?id=769453#c18)
66# if (O_TMPFILE & O_DIRECTORY) == O_DIRECTORY
67# define LINUX_UNNAMED_TMPFILE
68# endif
69# endif
70#endif
71
72QT_BEGIN_NAMESPACE
73
74struct QTemporaryFileName
75{
76 QFileSystemEntry::NativePath path;
77 qsizetype pos;
78 qsizetype length;
79
80 QTemporaryFileName(const QString &templateName);
81 QFileSystemEntry::NativePath generateNext();
82};
83
84#ifndef QT_NO_TEMPORARYFILE
85
86class QTemporaryFilePrivate : public QFilePrivate
87{
88 Q_DECLARE_PUBLIC(QTemporaryFile)
89
90public:
91 QTemporaryFilePrivate();
92 explicit QTemporaryFilePrivate(const QString &templateNameIn);
93 ~QTemporaryFilePrivate();
94
95 QAbstractFileEngine *engine() const override;
96 void resetFileEngine() const;
97 void materializeUnnamedFile();
98
99 bool autoRemove = true;
100 QString templateName = defaultTemplateName();
101
102 static QString defaultTemplateName();
103
104 friend class QLockFilePrivate;
105};
106
107class QTemporaryFileEngine : public QFSFileEngine
108{
109 Q_DECLARE_PRIVATE(QFSFileEngine)
110public:
111 enum Flags { Win32NonShared = 0x1 };
112
113 explicit QTemporaryFileEngine(const QString *_templateName, int _flags = 0)
114 : templateName(*_templateName), flags(_flags)
115 {}
116
117 void initialize(const QString &file, quint32 mode, bool nameIsTemplate = true)
118 {
119 Q_D(QFSFileEngine);
120 Q_ASSERT(!isReallyOpen());
121 fileMode = mode;
122 filePathIsTemplate = filePathWasTemplate = nameIsTemplate;
123
124 if (filePathIsTemplate) {
125 d->fileEntry.clear();
126 } else {
127 d->fileEntry = QFileSystemEntry(file);
128 QFSFileEngine::setFileName(file);
129 }
130 }
131 ~QTemporaryFileEngine();
132
133 bool isReallyOpen() const;
134 void setFileName(const QString &file) override;
135
136 bool open(QIODevice::OpenMode flags) override;
137 bool remove() override;
138 bool rename(const QString &newName) override;
139 bool renameOverwrite(const QString &newName) override;
140 bool close() override;
141 QString fileName(FileName file) const override;
142
143 enum MaterializationMode { Overwrite, DontOverwrite, NameIsTemplate };
144 bool materializeUnnamedFile(const QString &newName, MaterializationMode mode);
145 bool isUnnamedFile() const override final;
146
147 const QString &templateName;
148 quint32 fileMode = 0;
149 int flags = 0;
150 bool filePathIsTemplate = true;
151 bool filePathWasTemplate = true;
152 bool unnamedFile = false;
153};
154
155#endif // QT_NO_TEMPORARYFILE
156
157QT_END_NAMESPACE
158
159#endif /* QTEMPORARYFILE_P_H */
160
161

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