QPdf::ByteStream Class Reference

#include <qpdf_p.h>

Inheritance diagram for QPdf::ByteStream:

Public Functions
	ByteStream (bool fileBacking=false)
	ByteStream (QByteArray *ba, bool fileBacking=false)
void	clear ()
ByteStream &	operator<< (char chr)
ByteStream &	operator<< (const char *str)
ByteStream &	operator<< (const QByteArray &str)
ByteStream &	operator<< (const ByteStream &src)
ByteStream &	operator<< (qreal val)
ByteStream &	operator<< (int val)
ByteStream &	operator<< (const QPointF &p)
QIODevice *	stream ()
	~ByteStream ()

Static Public Functions
static int	chunkSize ()
static int	maxMemorySize ()

Protected Functions
void	constructor_helper (QIODevice *dev)
void	constructor_helper (QByteArray *ba)

Private Functions
void	prepareBuffer ()

Properties
QByteArray	ba
QIODevice *	dev
bool	fileBackingActive
bool	fileBackingEnabled
bool	handleDirty

Detailed Description

Definition at line 80 of file qpdf_p.h.

Constructors and Destructors

ByteStream() [1/2]

QPdf::ByteStream::ByteStream ( bool  fileBacking = false )

explicit

Definition at line 150 of file qpdf.cpp.

            : dev(new QBuffer(&ba)),
            fileBackingEnabled(fileBacking),
            fileBackingActive(false),
            handleDirty(false)
    {
        dev->open(QIODevice::ReadWrite);
    }

ByteStream() [2/2]

QPdf::ByteStream::ByteStream ( QByteArray *  ba, bool  fileBacking = false  )

explicit

Definition at line 141 of file qpdf.cpp.

            : dev(new QBuffer(byteArray)),
            fileBackingEnabled(fileBacking),
            fileBackingActive(false),
            handleDirty(false)
    {
        dev->open(QIODevice::ReadWrite | QIODevice::Append);
    }

~ByteStream()

QPdf::ByteStream::~ByteStream

(

)

Definition at line 159 of file qpdf.cpp.

    {
        delete dev;
    }

Functions

chunkSize()

static int QPdf::ByteStream::chunkSize ( )

inlinestatic

Definition at line 102 of file qpdf_p.h.

Referenced by QPSPrintEnginePrivate::emitPages(), operator<<(), prepareBuffer(), and QPdfEnginePrivate::writeCompressed().

{ return 10000000; }

clear()

void QPdf::ByteStream::clear

(

)

Definition at line 232 of file qpdf.cpp.

Referenced by QPSPrintEnginePrivate::emitPages(), and QPSPrintEnginePrivate::flushPage().

    {
        dev->open(QIODevice::ReadWrite | QIODevice::Truncate);
    }

constructor_helper() [1/2]

void QPdf::ByteStream::constructor_helper ( QIODevice *  dev )

protected

Referenced by chunkSize().

constructor_helper() [2/2]

void QPdf::ByteStream::constructor_helper ( QByteArray *  ba )

protected

Definition at line 237 of file qpdf.cpp.

    {
        delete dev;
        dev = new QBuffer(ba);
        dev->open(QIODevice::ReadWrite);
    }

maxMemorySize()

static int QPdf::ByteStream::maxMemorySize ( )

inlinestatic

Definition at line 101 of file qpdf_p.h.

Referenced by prepareBuffer().

{ return 100000000; }

operator<<() [1/7]

ByteStream & QPdf::ByteStream::operator<<

(

char

chr

)

Definition at line 164 of file qpdf.cpp.

    {
        if (handleDirty) prepareBuffer();
        dev->write(&chr, 1);
        return *this;
    }

operator<<() [2/7]

ByteStream & QPdf::ByteStream::operator<<

(

const char *

str

)

Definition at line 171 of file qpdf.cpp.

    {
        if (handleDirty) prepareBuffer();
        dev->write(str, strlen(str));
        return *this;
    }

operator<<() [3/7]

ByteStream & QPdf::ByteStream::operator<<

(

const QByteArray &

str

)

Definition at line 178 of file qpdf.cpp.

    {
        if (handleDirty) prepareBuffer();
        dev->write(str);
        return *this;
    }

operator<<() [4/7]

ByteStream & QPdf::ByteStream::operator<<

(

const ByteStream &

src

)

Definition at line 185 of file qpdf.cpp.

    {
        Q_ASSERT(!src.dev->isSequential());
        if (handleDirty) prepareBuffer();
        // We do play nice here, even though it looks ugly.
        // We save the position and restore it afterwards.
        ByteStream &s = const_cast<ByteStream&>(src);
        qint64 pos = s.dev->pos();
        s.dev->reset();
        while (!s.dev->atEnd()) {
            QByteArray buf = s.dev->read(chunkSize());
            dev->write(buf);
        }
        s.dev->seek(pos);
        return *this;
    }

operator<<() [5/7]

ByteStream & QPdf::ByteStream::operator<<

(

qreal

val

)

Definition at line 202 of file qpdf.cpp.

                                                 {
        char buf[256];
        qt_real_to_string(val, buf);
        *this << buf;
        return *this;
    }

operator<<() [6/7]

ByteStream & QPdf::ByteStream::operator<<

(

int

val

)

Definition at line 209 of file qpdf.cpp.

                                               {
        char buf[256];
        qt_int_to_string(val, buf);
        *this << buf;
        return *this;
    }

operator<<() [7/7]

ByteStream & QPdf::ByteStream::operator<<

(

const QPointF &

p

)

Definition at line 216 of file qpdf.cpp.

                                                        {
        char buf[256];
        qt_real_to_string(p.x(), buf);
        *this << buf;
        qt_real_to_string(p.y(), buf);
        *this << buf;
        return *this;
    }

prepareBuffer()

void QPdf::ByteStream::prepareBuffer ( )

private

Definition at line 244 of file qpdf.cpp.

Referenced by chunkSize(), and operator<<().

    {
        Q_ASSERT(!dev->isSequential());
        qint64 size = dev->size();
        if (fileBackingEnabled && !fileBackingActive
                && size > maxMemorySize()) {
            // Switch to file backing.
            QTemporaryFile *newFile = new QTemporaryFile;
            newFile->open();
            dev->reset();
            while (!dev->atEnd()) {
                QByteArray buf = dev->read(chunkSize());
                newFile->write(buf);
            }
            delete dev;
            dev = newFile;
            ba.clear();
            fileBackingActive = true;
        }
        if (dev->pos() != size) {
            dev->seek(size);
            handleDirty = false;
        }
    }

stream()

QIODevice * QPdf::ByteStream::stream

(

)

Definition at line 225 of file qpdf.cpp.

Referenced by QPSPrintEnginePrivate::emitPages(), QPSPrintEnginePrivate::flushPage(), and QPdfEnginePrivate::writePage().

    {
        dev->reset();
        handleDirty = true;
        return dev;
    }

Properties

ba

QByteArray QPdf::ByteStream::ba

private

Definition at line 113 of file qpdf_p.h.

Referenced by prepareBuffer().

dev

QIODevice* QPdf::ByteStream::dev

private

Definition at line 112 of file qpdf_p.h.

Referenced by ByteStream(), chunkSize(), clear(), constructor_helper(), operator<<(), prepareBuffer(), stream(), and ~ByteStream().

fileBackingActive

bool QPdf::ByteStream::fileBackingActive

private

Definition at line 115 of file qpdf_p.h.

Referenced by prepareBuffer().

fileBackingEnabled

bool QPdf::ByteStream::fileBackingEnabled

private

Definition at line 114 of file qpdf_p.h.

Referenced by prepareBuffer().

handleDirty

bool QPdf::ByteStream::handleDirty

private

Definition at line 116 of file qpdf_p.h.

Referenced by operator<<(), prepareBuffer(), and stream().

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The documentation for this class was generated from the following files:

• /src/gui/painting/qpdf_p.h
• /src/gui/painting/qpdf.cpp