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39
40#ifndef QNONCONTIGUOUSBYTEDEVICE_P_H
41#define QNONCONTIGUOUSBYTEDEVICE_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 for the convenience
48// of a number of Qt sources files. This header file may change from
49// version to version without notice, or even be removed.
50//
51// We mean it.
52//
53
54#include <QtCore/qobject.h>
55#include <QtCore/qbytearray.h>
56#include <QtCore/qbuffer.h>
57#include <QtCore/qiodevice.h>
58#include <QtCore/QSharedPointer>
59#include "private/qringbuffer_p.h"
60
61QT_BEGIN_NAMESPACE
62
63class Q_CORE_EXPORT QNonContiguousByteDevice : public QObject
64{
65 Q_OBJECT
66public:
67 virtual const char* readPointer(qint64 maximumLength, qint64 &len) = 0;
68 virtual bool advanceReadPointer(qint64 amount) = 0;
69 virtual bool atEnd() const = 0;
70 virtual qint64 pos() const { return -1; }
71 virtual bool reset() = 0;
72 virtual qint64 size() const = 0;
73
74 virtual ~QNonContiguousByteDevice();
75
76protected:
77 QNonContiguousByteDevice();
78
79
80Q_SIGNALS:
81 void readyRead();
82 void readProgress(qint64 current, qint64 total);
83};
84
85class Q_CORE_EXPORT QNonContiguousByteDeviceFactory
86{
87public:
88 static QNonContiguousByteDevice* create(QIODevice *device);
89 static QSharedPointer<QNonContiguousByteDevice> createShared(QIODevice *device);
90
91 static QNonContiguousByteDevice* create(QByteArray *byteArray);
92 static QSharedPointer<QNonContiguousByteDevice> createShared(QByteArray *byteArray);
93
94 static QNonContiguousByteDevice* create(QSharedPointer<QRingBuffer> ringBuffer);
95 static QSharedPointer<QNonContiguousByteDevice> createShared(QSharedPointer<QRingBuffer> ringBuffer);
96
97 static QIODevice* wrap(QNonContiguousByteDevice* byteDevice);
98};
99
100// the actual implementations
101//
102
103class QNonContiguousByteDeviceByteArrayImpl : public QNonContiguousByteDevice
104{
105public:
106 QNonContiguousByteDeviceByteArrayImpl(QByteArray *ba);
107 ~QNonContiguousByteDeviceByteArrayImpl();
108 const char* readPointer(qint64 maximumLength, qint64 &len) override;
109 bool advanceReadPointer(qint64 amount) override;
110 bool atEnd() const override;
111 bool reset() override;
112 qint64 size() const override;
113 qint64 pos() const override;
114protected:
115 QByteArray* byteArray;
116 qint64 currentPosition;
117};
118
119class QNonContiguousByteDeviceRingBufferImpl : public QNonContiguousByteDevice
120{
121public:
122 QNonContiguousByteDeviceRingBufferImpl(QSharedPointer<QRingBuffer> rb);
123 ~QNonContiguousByteDeviceRingBufferImpl();
124 const char* readPointer(qint64 maximumLength, qint64 &len) override;
125 bool advanceReadPointer(qint64 amount) override;
126 bool atEnd() const override;
127 bool reset() override;
128 qint64 size() const override;
129 qint64 pos() const override;
130protected:
131 QSharedPointer<QRingBuffer> ringBuffer;
132 qint64 currentPosition;
133};
134
135
136class QNonContiguousByteDeviceIoDeviceImpl : public QNonContiguousByteDevice
137{
138 Q_OBJECT
139public:
140 QNonContiguousByteDeviceIoDeviceImpl(QIODevice *d);
141 ~QNonContiguousByteDeviceIoDeviceImpl();
142 const char* readPointer(qint64 maximumLength, qint64 &len) override;
143 bool advanceReadPointer(qint64 amount) override;
144 bool atEnd() const override;
145 bool reset() override;
146 qint64 size() const override;
147 qint64 pos() const override;
148protected:
149 QIODevice* device;
150 QByteArray* currentReadBuffer;
151 qint64 currentReadBufferSize;
152 qint64 currentReadBufferAmount;
153 qint64 currentReadBufferPosition;
154 qint64 totalAdvancements;
155 bool eof;
156 qint64 initialPosition;
157};
158
159class QNonContiguousByteDeviceBufferImpl : public QNonContiguousByteDevice
160{
161 Q_OBJECT
162public:
163 QNonContiguousByteDeviceBufferImpl(QBuffer *b);
164 ~QNonContiguousByteDeviceBufferImpl();
165 const char* readPointer(qint64 maximumLength, qint64 &len) override;
166 bool advanceReadPointer(qint64 amount) override;
167 bool atEnd() const override;
168 bool reset() override;
169 qint64 size() const override;
170protected:
171 QBuffer* buffer;
172 QByteArray byteArray;
173 QNonContiguousByteDeviceByteArrayImpl* arrayImpl;
174};
175
176// ... and the reverse thing
177class QByteDeviceWrappingIoDevice : public QIODevice
178{
179public:
180 QByteDeviceWrappingIoDevice (QNonContiguousByteDevice *bd);
181 ~QByteDeviceWrappingIoDevice ();
182 bool isSequential() const override;
183 bool atEnd() const override;
184 bool reset() override;
185 qint64 size() const override;
186protected:
187 qint64 readData(char *data, qint64 maxSize) override;
188 qint64 writeData(const char *data, qint64 maxSize) override;
189
190 QNonContiguousByteDevice *byteDevice;
191};
192
193QT_END_NAMESPACE
194
195#endif
196

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