OpenShot Audio Library | OpenShotAudio 0.4.0

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juce_TemporaryFile.cpp
1/*
2 ==============================================================================
3
4 This file is part of the JUCE library.
5 Copyright (c) 2022 - Raw Material Software Limited
6
7 JUCE is an open source library subject to commercial or open-source
8 licensing.
9
10 The code included in this file is provided under the terms of the ISC license
11 http://www.isc.org/downloads/software-support-policy/isc-license. Permission
12 To use, copy, modify, and/or distribute this software for any purpose with or
13 without fee is hereby granted provided that the above copyright notice and
14 this permission notice appear in all copies.
15
16 JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
17 EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
18 DISCLAIMED.
19
20 ==============================================================================
21*/
22
23 namespace juce
24{
25
26// Using Random::getSystemRandom() can be a bit dangerous in multithreaded contexts!
27 class LockedRandom
28{
29 public:
30 int nextInt()
31 {
32 const ScopedLock lock (mutex);
33 return random.nextInt();
34 }
35
36 private:
37 CriticalSection mutex;
38 Random random;
39};
40
41 static LockedRandom lockedRandom;
42
43 static File createTempFile (const File& parentDirectory, String name,
44 const String& suffix, int optionFlags)
45{
46 if ((optionFlags & TemporaryFile::useHiddenFile) != 0)
47 name = "." + name;
48
49 return parentDirectory.getNonexistentChildFile (name, suffix, (optionFlags & TemporaryFile::putNumbersInBrackets) != 0);
50}
51
52 TemporaryFile::TemporaryFile (const String& suffix, const int optionFlags)
53 : temporaryFile (createTempFile (File::getSpecialLocation (File::tempDirectory),
54 "temp_" + String::toHexString (lockedRandom.nextInt()),
55 suffix, optionFlags)),
56 targetFile()
57{
58}
59
60 TemporaryFile::TemporaryFile (const File& target, const int optionFlags)
61 : temporaryFile (createTempFile (target.getParentDirectory(),
62 target.getFileNameWithoutExtension()
63 + "_temp" + String::toHexString (lockedRandom.nextInt()),
64 target.getFileExtension(), optionFlags)),
65 targetFile (target)
66{
67 // If you use this constructor, you need to give it a valid target file!
68 jassert (targetFile != File());
69}
70
71 TemporaryFile::TemporaryFile (const File& target, const File& temporary)
72 : temporaryFile (temporary), targetFile (target)
73{
74}
75
76 TemporaryFile::~TemporaryFile()
77{
78 if (! deleteTemporaryFile())
79 {
80 /* Failed to delete our temporary file! The most likely reason for this would be
81 that you've not closed an output stream that was being used to write to file.
82
83 If you find that something beyond your control is changing permissions on
84 your temporary files and preventing them from being deleted, you may want to
85 call TemporaryFile::deleteTemporaryFile() to detect those error cases and
86 handle them appropriately.
87 */
88 jassertfalse;
89 }
90}
91
92//==============================================================================
93 bool TemporaryFile::overwriteTargetFileWithTemporary() const
94{
95 // This method only works if you created this object with the constructor
96 // that takes a target file!
97 jassert (targetFile != File());
98
99 if (temporaryFile.exists())
100 {
101 // Have a few attempts at overwriting the file before giving up..
102 for (int i = 5; --i >= 0;)
103 {
104 if (temporaryFile.replaceFileIn (targetFile))
105 return true;
106
107 Thread::sleep (100);
108 }
109 }
110 else
111 {
112 // There's no temporary file to use. If your write failed, you should
113 // probably check, and not bother calling this method.
114 jassertfalse;
115 }
116
117 return false;
118}
119
120 bool TemporaryFile::deleteTemporaryFile() const
121{
122 // Have a few attempts at deleting the file before giving up..
123 for (int i = 5; --i >= 0;)
124 {
125 if (temporaryFile.isDirectory() ? temporaryFile.deleteRecursively() : temporaryFile.deleteFile())
126 return true;
127
128 Thread::sleep (50);
129 }
130
131 return false;
132}
133
134} // namespace juce
juce::File
Definition juce_File.h:45
juce::File::isDirectory
bool isDirectory() const
juce::File::deleteRecursively
bool deleteRecursively(bool followSymlinks=false) const
Definition juce_File.cpp:277
juce::File::getNonexistentChildFile
File getNonexistentChildFile(const String &prefix, const String &suffix, bool putNumbersInBrackets=true) const
Definition juce_File.cpp:609
juce::File::deleteFile
bool deleteFile() const
juce::File::replaceFileIn
bool replaceFileIn(const File &targetLocation) const
Definition juce_File.cpp:311
juce::File::exists
bool exists() const
juce::Random::nextInt
int nextInt() noexcept
Definition juce_Random.cpp:74
juce::String
Definition juce_String.h:53
juce::TemporaryFile::putNumbersInBrackets
@ putNumbersInBrackets
Definition juce_TemporaryFile.h:72
juce::TemporaryFile::useHiddenFile
@ useHiddenFile
Definition juce_TemporaryFile.h:70
juce::TemporaryFile::deleteTemporaryFile
bool deleteTemporaryFile() const
Definition juce_TemporaryFile.cpp:120
juce::TemporaryFile::overwriteTargetFileWithTemporary
bool overwriteTargetFileWithTemporary() const
Definition juce_TemporaryFile.cpp:93
juce::TemporaryFile::~TemporaryFile
~TemporaryFile()
Definition juce_TemporaryFile.cpp:76
juce::TemporaryFile::TemporaryFile
TemporaryFile(const String &suffix=String(), int optionFlags=0)
Definition juce_TemporaryFile.cpp:52
juce::Thread::sleep
static void JUCE_CALLTYPE sleep(int milliseconds)