#include <qnoncontiguousbytedevice_p.h>

Inheritance diagram for QNonContiguousByteDeviceIoDeviceImpl:

Public Functions
bool	advanceReadPointer (qint64 amount)
	The old readPointer is invalid after this call. More...

bool	atEnd ()
	Returns true if everything has been read and the read pointer cannot be advanced anymore. More...

	QNonContiguousByteDeviceIoDeviceImpl (QIODevice *d)

const char *	readPointer (qint64 maximumLength, qint64 &len)
	Return a byte pointer for at most maximumLength bytes of that device. More...

bool	reset ()
	Moves the internal read pointer back to the beginning. More...

qint64	size ()
	Returns the size of the complete device or -1 if unknown. More...

	~QNonContiguousByteDeviceIoDeviceImpl ()

Public Functions inherited from QNonContiguousByteDevice
void	disableReset ()
	Disable the reset() call, e. More...

bool	isResetDisabled ()

virtual	~QNonContiguousByteDevice ()

Public Functions inherited from QObject
bool	blockSignals (bool b)
	If block is true, signals emitted by this object are blocked (i.e., emitting a signal will not invoke anything connected to it). More...

const QObjectList &	children () const
	Returns a list of child objects. More...

bool	connect (const QObject sender, const char signal, const char *member, Qt::ConnectionType type=Qt::AutoConnection) const

bool	disconnect (const char signal=0, const QObject receiver=0, const char *member=0)

bool	disconnect (const QObject receiver, const char member=0)

void	dumpObjectInfo ()
	Dumps information about signal connections, etc. More...

void	dumpObjectTree ()
	Dumps a tree of children to the debug output. More...

QList< QByteArray >	dynamicPropertyNames () const
	Returns the names of all properties that were dynamically added to the object using setProperty(). More...

virtual bool	event (QEvent *)
	This virtual function receives events to an object and should return true if the event e was recognized and processed. More...

virtual bool	eventFilter (QObject , QEvent )
	Filters events if this object has been installed as an event filter for the watched object. More...

template<typename T >
T	findChild (const QString &aName=QString()) const
	Returns the child of this object that can be cast into type T and that is called name, or 0 if there is no such object. More...

template<typename T >
QList< T >	findChildren (const QString &aName=QString()) const
	Returns all children of this object with the given name that can be cast to type T, or an empty list if there are no such objects. More...

template<typename T >
QList< T >	findChildren (const QRegExp &re) const

bool	inherits (const char *classname) const
	Returns true if this object is an instance of a class that inherits className or a QObject subclass that inherits className; otherwise returns false. More...

void	installEventFilter (QObject *)
	Installs an event filter filterObj on this object. More...

bool	isWidgetType () const
	Returns true if the object is a widget; otherwise returns false. More...

void	killTimer (int id)
	Kills the timer with timer identifier, id. More...

virtual const QMetaObject *	metaObject () const
	Returns a pointer to the meta-object of this object. More...

void	moveToThread (QThread *thread)
	Changes the thread affinity for this object and its children. More...

QString	objectName () const

QObject *	parent () const
	Returns a pointer to the parent object. More...

QVariant	property (const char *name) const
	Returns the value of the object's name property. More...

Q_INVOKABLE	QObject (QObject *parent=0)
	Constructs an object with parent object parent. More...

void	removeEventFilter (QObject *)
	Removes an event filter object obj from this object. More...

void	setObjectName (const QString &name)

void	setParent (QObject *)
	Makes the object a child of parent. More...

bool	setProperty (const char *name, const QVariant &value)
	Sets the value of the object's name property to value. More...

void	setUserData (uint id, QObjectUserData *data)

bool	signalsBlocked () const
	Returns true if signals are blocked; otherwise returns false. More...

int	startTimer (int interval)
	Starts a timer and returns a timer identifier, or returns zero if it could not start a timer. More...

QThread *	thread () const
	Returns the thread in which the object lives. More...

QObjectUserData *	userData (uint id) const

virtual	~QObject ()
	Destroys the object, deleting all its child objects. More...

Protected Variables
QByteArray *	currentReadBuffer

qint64	currentReadBufferAmount

qint64	currentReadBufferPosition

qint64	currentReadBufferSize

QIODevice *	device

bool	eof

qint64	initialPosition

qint64	totalAdvancements

Protected Variables inherited from QNonContiguousByteDevice
bool	resetDisabled

Protected Variables inherited from QObject
QScopedPointer< QObjectData >	d_ptr

Additional Inherited Members
Public Slots inherited from QObject
void	deleteLater ()
	Schedules this object for deletion. More...

Signals inherited from QNonContiguousByteDevice
void	readProgress (qint64 current, qint64 total)
	Emitted when data has been "read" by advancing the read pointer. More...

void	readyRead ()
	Emitted when there is data available. More...

Signals inherited from QObject
void	destroyed (QObject *=0)
	This signal is emitted immediately before the object obj is destroyed, and can not be blocked. More...

Static Public Functions inherited from QObject
static bool	connect (const QObject sender, const char signal, const QObject receiver, const char member, Qt::ConnectionType=Qt::AutoConnection)
	Creates a connection of the given type from the signal in the sender object to the method in the receiver object. More...

static bool	connect (const QObject sender, const QMetaMethod &signal, const QObject receiver, const QMetaMethod &method, Qt::ConnectionType type=Qt::AutoConnection)

static bool	disconnect (const QObject sender, const char signal, const QObject receiver, const char member)
	Disconnects signal in object sender from method in object receiver. More...

static bool	disconnect (const QObject sender, const QMetaMethod &signal, const QObject receiver, const QMetaMethod &member)

static uint	registerUserData ()

static QString	tr (const char sourceText, const char comment=0, int n=-1)

static QString	trUtf8 (const char sourceText, const char comment=0, int n=-1)

Static Public Variables inherited from QObject
static const QMetaObject	staticMetaObject
	This variable stores the meta-object for the class. More...

Protected Functions inherited from QNonContiguousByteDevice
	QNonContiguousByteDevice ()

Protected Functions inherited from QObject
virtual void	childEvent (QChildEvent *)
	This event handler can be reimplemented in a subclass to receive child events. More...

virtual void	connectNotify (const char *signal)
	This virtual function is called when something has been connected to signal in this object. More...

virtual void	customEvent (QEvent *)
	This event handler can be reimplemented in a subclass to receive custom events. More...

virtual void	disconnectNotify (const char *signal)
	This virtual function is called when something has been disconnected from signal in this object. More...

	QObject (QObjectPrivate &dd, QObject *parent=0)

int	receivers (const char *signal) const
	Returns the number of receivers connected to the signal. More...

QObject *	sender () const
	Returns a pointer to the object that sent the signal, if called in a slot activated by a signal; otherwise it returns 0. More...

int	senderSignalIndex () const

virtual void	timerEvent (QTimerEvent *)
	This event handler can be reimplemented in a subclass to receive timer events for the object. More...

Static Protected Variables inherited from QObject
static const QMetaObject	staticQtMetaObject

Related Functions inherited from QObject
T	qFindChildqFindChildren (const QObject *obj, const QString &name)()

QList< T >	qFindChildrenqFindChildren (const QObject *obj, const QString &name)()

QList< T >	qFindChildrenqFindChildren (const QObject *obj, const QRegExp &regExp)()

T *	qobject_cast (QObject *object)

	QObjectList

void *	qt_find_obj_child (QObject parent, const char type, const QString &name)
	Returns a pointer to the object named name that inherits type and with a given parent. More...

Detailed Description

Definition at line 132 of file qnoncontiguousbytedevice_p.h.

Constructors and Destructors

◆ QNonContiguousByteDeviceIoDeviceImpl()

QNonContiguousByteDeviceIoDeviceImpl::QNonContiguousByteDeviceIoDeviceImpl ( QIODevice * d )

Definition at line 317 of file qnoncontiguousbytedevice.cpp.

     : QNonContiguousByteDevice(),
     currentReadBuffer(0), currentReadBufferSize(16*1024),
     currentReadBufferAmount(0), currentReadBufferPosition(0), totalAdvancements(0),
     eof(false)
 {
     device = d;
     initialPosition = d->pos();
     connect(device, SIGNAL(readyRead()), this, SIGNAL(readyRead()), Qt::QueuedConnection);
     connect(device, SIGNAL(readChannelFinished()), this, SIGNAL(readyRead()), Qt::QueuedConnection);
 }

◆ ~QNonContiguousByteDeviceIoDeviceImpl()

QNonContiguousByteDeviceIoDeviceImpl::~QNonContiguousByteDeviceIoDeviceImpl ( )

Definition at line 329 of file qnoncontiguousbytedevice.cpp.

 {
     delete currentReadBuffer;
 }

Functions

◆ advanceReadPointer()

bool QNonContiguousByteDeviceIoDeviceImpl::advanceReadPointer ( qint64 amount )

virtual

The old readPointer is invalid after this call.

will advance the internal read pointer by amount bytes.

See also: readPointer()

Warning: This function is not part of the public interface.

Implements QNonContiguousByteDevice.

Definition at line 370 of file qnoncontiguousbytedevice.cpp.

 {
     totalAdvancements += amount;
 
     // normal advancement
     currentReadBufferPosition += amount;
 
     if (size() == -1)
         emit readProgress(totalAdvancements, totalAdvancements);
     else
         emit readProgress(totalAdvancements, size());
 
     // advancing over that what has actually been read before
     if (currentReadBufferPosition > currentReadBufferAmount) {
         qint64 i = currentReadBufferPosition - currentReadBufferAmount;
         while (i > 0) {
             if (device->getChar(0) == false) {
                 emit readProgress(totalAdvancements - i, size());
                 return false; // ### FIXME handle eof
             }
             i--;
         }
 
         currentReadBufferPosition = 0;
         currentReadBufferAmount = 0;
     }
 
 
     return true;
 }

◆ atEnd()

bool QNonContiguousByteDeviceIoDeviceImpl::atEnd ( )

virtual

Returns true if everything has been read and the read pointer cannot be advanced anymore.

See also: readPointer(), advanceReadPointer(), reset()

Warning: This function is not part of the public interface.

Implements QNonContiguousByteDevice.

Definition at line 401 of file qnoncontiguousbytedevice.cpp.

 {
     return eof == true;
 }

◆ readPointer()

const char * QNonContiguousByteDeviceIoDeviceImpl::readPointer	(	qint64	maximumLength,
		qint64 &	len
	)

virtual

Return a byte pointer for at most maximumLength bytes of that device.

if maximumLength is -1, the caller does not care about the length and the device may return what it desires to. The actual number of bytes the pointer is valid for is returned in the len variable. len will be -1 if EOF or an error occurs. If it was really EOF can then afterwards be checked with atEnd() Returns 0 if it is not possible to read at that position.

See also: atEnd()

Warning: This function is not part of the public interface.

Implements QNonContiguousByteDevice.

Definition at line 334 of file qnoncontiguousbytedevice.cpp.

 {
     if (eof == true) {
         len = -1;
         return 0;
     }
 
     if (currentReadBuffer == 0)
         currentReadBuffer = new QByteArray(currentReadBufferSize, '\0'); // lazy alloc
 
     if (maximumLength == -1)
         maximumLength = currentReadBufferSize;
 
     if (currentReadBufferAmount - currentReadBufferPosition > 0) {
         len = currentReadBufferAmount - currentReadBufferPosition;
         return currentReadBuffer->data() + currentReadBufferPosition;
     }
 
     qint64 haveRead = device->read(currentReadBuffer->data(), qMin(maximumLength, currentReadBufferSize));
 
     if ((haveRead == -1) || (haveRead == 0 && device->atEnd() && !device->isSequential())) {
         eof = true;
         len = -1;
         // size was unknown before, emit a readProgress with the final size
         if (size() == -1)
             emit readProgress(totalAdvancements, totalAdvancements);
         return 0;
     }
 
     currentReadBufferAmount = haveRead;
     currentReadBufferPosition = 0;
 
     len = haveRead;
     return currentReadBuffer->data();
 }

◆ reset()

bool QNonContiguousByteDeviceIoDeviceImpl::reset ( )

virtual

Moves the internal read pointer back to the beginning.

Returns false if this was not possible.

See also: atEnd(), disableReset()

Warning: This function is not part of the public interface.

Implements QNonContiguousByteDevice.

Definition at line 406 of file qnoncontiguousbytedevice.cpp.

 {
     if (resetDisabled)
         return false;
     bool reset = (initialPosition == 0) ? device->reset() : device->seek(initialPosition);
     if (reset) {
         eof = false; // assume eof is false, it will be true after a read has been attempted
         totalAdvancements = 0; //reset the progress counter
         if (currentReadBuffer) {
             delete currentReadBuffer;
             currentReadBuffer = 0;
         }
         currentReadBufferAmount = 0;
         currentReadBufferPosition = 0;
         return true;
     }
 
     return false;
 }

◆ size()

qint64 QNonContiguousByteDeviceIoDeviceImpl::size ( )

virtual

Returns the size of the complete device or -1 if unknown.

May also return less/more than what can be actually read with readPointer()

Warning: This function is not part of the public interface.

Implements QNonContiguousByteDevice.

Definition at line 426 of file qnoncontiguousbytedevice.cpp.

Referenced by advanceReadPointer(), and readPointer().

 {
     // note that this is different from the size() implementation of QIODevice!
 
     if (device->isSequential())
         return -1;
 
     return device->size() - initialPosition;
 }