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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
61QT_REQUIRE_CONFIG(networkdiskcache);
62
63QT_BEGIN_NAMESPACE
64
65class QFile;
66
67class QCacheItem
68{
69public:
70 QCacheItem() : file(nullptr)
71 {
72 }
73 ~QCacheItem()
74 {
75 reset();
76 }
77
78 QNetworkCacheMetaData metaData;
79 QBuffer data;
80 QTemporaryFile *file;
81 inline qint64 size() const
82 { return file ? file->size() : data.size(); }
83
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
97class QNetworkDiskCachePrivate : public QAbstractNetworkCachePrivate
98{
99public:
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
124QT_END_NAMESPACE
125
126#endif // QNETWORKDISKCACHE_P_H
127

source code of qtbase/src/network/access/qnetworkdiskcache_p.h