1 /****************************************************************************
2 **
3 ** Copyright (C) 2016 The Qt Company Ltd.
4 ** Contact: https://www.qt.io/licensing/
5 **
6 ** This file is part of the QtNetwork module of the Qt Toolkit.
7 **
8 ** $QT_BEGIN_LICENSE:LGPL$
9 ** Commercial License Usage
10 ** Licensees holding valid commercial Qt licenses may use this file in
11 ** accordance with the commercial license agreement provided with the
12 ** Software or, alternatively, in accordance with the terms contained in
13 ** a written agreement between you and The Qt Company. For licensing terms
14 ** and conditions see https://www.qt.io/terms-conditions. For further
15 ** information use the contact form at https://www.qt.io/contact-us.
16 **
17 ** GNU Lesser General Public License Usage
18 ** Alternatively, this file may be used under the terms of the GNU Lesser
19 ** General Public License version 3 as published by the Free Software
20 ** Foundation and appearing in the file LICENSE.LGPL3 included in the
21 ** packaging of this file. Please review the following information to
22 ** ensure the GNU Lesser General Public License version 3 requirements
23 ** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
24 **
25 ** GNU General Public License Usage
26 ** Alternatively, this file may be used under the terms of the GNU
27 ** General Public License version 2.0 or (at your option) the GNU General
28 ** Public license version 3 or any later version approved by the KDE Free
29 ** Qt Foundation. The licenses are as published by the Free Software
30 ** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
31 ** included in the packaging of this file. Please review the following
32 ** information to ensure the GNU General Public License requirements will
33 ** be met: https://www.gnu.org/licenses/gpl-2.0.html and
34 ** https://www.gnu.org/licenses/gpl-3.0.html.
35 **
36 ** $QT_END_LICENSE$
37 **
38 ****************************************************************************/
39 
40 #ifndef QNETWORKDISKCACHE_P_H
41 #define QNETWORKDISKCACHE_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 <QtNetwork/private/qtnetworkglobal_p.h>
55 #include "private/qabstractnetworkcache_p.h"
56 
57 #include <qbuffer.h>
58 #include <qhash.h>
59 #include <qtemporaryfile.h>
60 
61 QT_REQUIRE_CONFIG(networkdiskcache);
62 
63 QT_BEGIN_NAMESPACE
64 
65 class QFile;
66 
67 class QCacheItem
68 {
69 public:
QCacheItem()70     QCacheItem() : file(nullptr)
71     {
72     }
~QCacheItem()73     ~QCacheItem()
74     {
75         reset();
76     }
77 
78     QNetworkCacheMetaData metaData;
79     QBuffer data;
80     QTemporaryFile *file;
size()81     inline qint64 size() const
82         { return file ? file->size() : data.size(); }
83 
reset()84     inline void reset() {
85         metaData = QNetworkCacheMetaData();
86         data.close();
87         delete file;
88         file = nullptr;
89     }
90     void writeHeader(QFile *device) const;
91     void writeCompressedData(QFile *device) const;
92     bool read(QFile *device, bool readData);
93 
94     bool canCompress() const;
95 };
96 
97 class QNetworkDiskCachePrivate : public QAbstractNetworkCachePrivate
98 {
99 public:
QNetworkDiskCachePrivate()100     QNetworkDiskCachePrivate()
101         : QAbstractNetworkCachePrivate()
102         , maximumCacheSize(1024 * 1024 * 50)
103         , currentCacheSize(-1)
104         {}
105 
106     static QString uniqueFileName(const QUrl &url);
107     QString cacheFileName(const QUrl &url) const;
108     QString tmpCacheFileName() const;
109     bool removeFile(const QString &file);
110     void storeItem(QCacheItem *item);
111     void prepareLayout();
112     static quint32 crc32(const char *data, uint len);
113 
114     mutable QCacheItem lastItem;
115     QString cacheDirectory;
116     QString dataDirectory;
117     qint64 maximumCacheSize;
118     qint64 currentCacheSize;
119 
120     QHash<QIODevice*, QCacheItem*> inserting;
121     Q_DECLARE_PUBLIC(QNetworkDiskCache)
122 };
123 
124 QT_END_NAMESPACE
125 
126 #endif // QNETWORKDISKCACHE_P_H
127