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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef QIODEVICE_P_H
#define QIODEVICE_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists for the convenience
// of QIODevice. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include "QtCore/qbytearray.h"
#include "QtCore/qiodevice.h"
#include "QtCore/qobjectdefs.h"
#include "QtCore/qstring.h"
#include "QtCore/qvarlengtharray.h"
#include "private/qringbuffer_p.h"
#ifndef QT_NO_QOBJECT
#include "private/qobject_p.h"
#endif
QT_BEGIN_NAMESPACE
#ifndef QIODEVICE_BUFFERSIZE
#define QIODEVICE_BUFFERSIZE 16384
#endif
Q_CORE_EXPORT int qt_subtract_from_timeout(int timeout, int elapsed);
class Q_CORE_EXPORT QIODevicePrivate
#ifndef QT_NO_QOBJECT
: public QObjectPrivate
#endif
{
Q_DECLARE_PUBLIC(QIODevice)
Q_DISABLE_COPY_MOVE(QIODevicePrivate)
public:
QIODevicePrivate();
virtual ~QIODevicePrivate();
// The size of this class is a subject of the library hook data.
// When adding a new member, do not make gaps and be aware
// about the padding. Accordingly, adjust offsets in
// tests/auto/other/toolsupport and bump the TypeInformationVersion
// field in src/corelib/global/qhooks.cpp, to notify the developers.
qint64 pos = 0;
qint64 devicePos = 0;
qint64 transactionPos = 0;
class QRingBufferRef
{
QRingBuffer *m_buf;
inline QRingBufferRef() : m_buf(nullptr) { }
friend class QIODevicePrivate;
public:
// wrap functions from QRingBuffer
inline void setChunkSize(int size) { Q_ASSERT(m_buf); m_buf->setChunkSize(size); }
inline int chunkSize() const { Q_ASSERT(m_buf); return m_buf->chunkSize(); }
inline qint64 nextDataBlockSize() const { return (m_buf ? m_buf->nextDataBlockSize() : Q_INT64_C(0)); }
inline const char *readPointer() const { return (m_buf ? m_buf->readPointer() : nullptr); }
inline const char *readPointerAtPosition(qint64 pos, qint64 &length) const { Q_ASSERT(m_buf); return m_buf->readPointerAtPosition(pos, length); }
inline void free(qint64 bytes) { Q_ASSERT(m_buf); m_buf->free(bytes); }
inline char *reserve(qint64 bytes) { Q_ASSERT(m_buf); return m_buf->reserve(bytes); }
inline char *reserveFront(qint64 bytes) { Q_ASSERT(m_buf); return m_buf->reserveFront(bytes); }
inline void truncate(qint64 pos) { Q_ASSERT(m_buf); m_buf->truncate(pos); }
inline void chop(qint64 bytes) { Q_ASSERT(m_buf); m_buf->chop(bytes); }
inline bool isEmpty() const { return !m_buf || m_buf->isEmpty(); }
inline int getChar() { return (m_buf ? m_buf->getChar() : -1); }
inline void putChar(char c) { Q_ASSERT(m_buf); m_buf->putChar(c); }
inline void ungetChar(char c) { Q_ASSERT(m_buf); m_buf->ungetChar(c); }
inline qint64 size() const { return (m_buf ? m_buf->size() : Q_INT64_C(0)); }
inline void clear() { if (m_buf) m_buf->clear(); }
inline qint64 indexOf(char c) const { return (m_buf ? m_buf->indexOf(c, m_buf->size()) : Q_INT64_C(-1)); }
inline qint64 indexOf(char c, qint64 maxLength, qint64 pos = 0) const { return (m_buf ? m_buf->indexOf(c, maxLength, pos) : Q_INT64_C(-1)); }
inline qint64 read(char *data, qint64 maxLength) { return (m_buf ? m_buf->read(data, maxLength) : Q_INT64_C(0)); }
inline QByteArray read() { return (m_buf ? m_buf->read() : QByteArray()); }
inline qint64 peek(char *data, qint64 maxLength, qint64 pos = 0) const { return (m_buf ? m_buf->peek(data, maxLength, pos) : Q_INT64_C(0)); }
inline void append(const char *data, qint64 size) { Q_ASSERT(m_buf); m_buf->append(data, size); }
inline void append(const QByteArray &qba) { Q_ASSERT(m_buf); m_buf->append(qba); }
inline qint64 skip(qint64 length) { return (m_buf ? m_buf->skip(length) : Q_INT64_C(0)); }
inline qint64 readLine(char *data, qint64 maxLength) { return (m_buf ? m_buf->readLine(data, maxLength) : Q_INT64_C(-1)); }
inline bool canReadLine() const { return m_buf && m_buf->canReadLine(); }
};
QRingBufferRef buffer;
QRingBufferRef writeBuffer;
const QByteArray *currentWriteChunk = nullptr;
int readChannelCount = 0;
int writeChannelCount = 0;
int currentReadChannel = 0;
int currentWriteChannel = 0;
int readBufferChunkSize = QIODEVICE_BUFFERSIZE;
int writeBufferChunkSize = 0;
QVarLengthArray<QRingBuffer, 2> readBuffers;
QVarLengthArray<QRingBuffer, 1> writeBuffers;
QString errorString;
QIODevice::OpenMode openMode = QIODevice::NotOpen;
bool transactionStarted = false;
bool baseReadLineDataCalled = false;
virtual bool putCharHelper(char c);
enum AccessMode : quint8 {
Unset,
Sequential,
RandomAccess
};
mutable AccessMode accessMode = Unset;
inline bool isSequential() const
{
if (accessMode == Unset)
accessMode = q_func()->isSequential() ? Sequential : RandomAccess;
return accessMode == Sequential;
}
inline bool isBufferEmpty() const
{
return buffer.isEmpty() || (transactionStarted && isSequential()
&& transactionPos == buffer.size());
}
bool allWriteBuffersEmpty() const;
void seekBuffer(qint64 newPos);
inline void setCurrentReadChannel(int channel)
{
buffer.m_buf = (channel < readBuffers.size() ? &readBuffers[channel] : nullptr);
currentReadChannel = channel;
}
inline void setCurrentWriteChannel(int channel)
{
writeBuffer.m_buf = (channel < writeBuffers.size() ? &writeBuffers[channel] : nullptr);
currentWriteChannel = channel;
}
void setReadChannelCount(int count);
void setWriteChannelCount(int count);
qint64 read(char *data, qint64 maxSize, bool peeking = false);
qint64 readLine(char *data, qint64 maxSize);
virtual qint64 peek(char *data, qint64 maxSize);
virtual QByteArray peek(qint64 maxSize);
qint64 skipByReading(qint64 maxSize);
void write(const char *data, qint64 size);
inline bool isWriteChunkCached(const char *data, qint64 size) const
{
return currentWriteChunk != nullptr
&& currentWriteChunk->constData() == data
&& currentWriteChunk->size() == size;
}
#ifdef QT_NO_QOBJECT
QIODevice *q_ptr = nullptr;
#endif
};
QT_END_NAMESPACE
#endif // QIODEVICE_P_H
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