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authorQt by Nokia <qt-info@nokia.com>2011-04-27 12:05:43 +0200
committeraxis <qt-info@nokia.com>2011-04-27 12:05:43 +0200
commit38be0d13830efd2d98281c645c3a60afe05ffece (patch)
tree6ea73f3ec77f7d153333779883e8120f82820abe /src/corelib/io/qdatastream.cpp
Initial import from the monolithic Qt.
This is the beginning of revision history for this module. If you want to look at revision history older than this, please refer to the Qt Git wiki for how to use Git history grafting. At the time of writing, this wiki is located here: http://qt.gitorious.org/qt/pages/GitIntroductionWithQt If you have already performed the grafting and you don't see any history beyond this commit, try running "git log" with the "--follow" argument. Branched from the monolithic repo, Qt master branch, at commit 896db169ea224deb96c59ce8af800d019de63f12
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+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qdatastream.h"
+#include "qdatastream_p.h"
+
+#if !defined(QT_NO_DATASTREAM) || defined(QT_BOOTSTRAPPED)
+#include "qbuffer.h"
+#include "qstring.h"
+#include <stdio.h>
+#include <ctype.h>
+#include <stdlib.h>
+#include "qendian.h"
+
+QT_BEGIN_NAMESPACE
+
+/*!
+ \class QDataStream
+ \reentrant
+ \brief The QDataStream class provides serialization of binary data
+ to a QIODevice.
+
+ \ingroup io
+
+
+ A data stream is a binary stream of encoded information which is
+ 100% independent of the host computer's operating system, CPU or
+ byte order. For example, a data stream that is written by a PC
+ under Windows can be read by a Sun SPARC running Solaris.
+
+ You can also use a data stream to read/write \l{raw}{raw
+ unencoded binary data}. If you want a "parsing" input stream, see
+ QTextStream.
+
+ The QDataStream class implements the serialization of C++'s basic
+ data types, like \c char, \c short, \c int, \c{char *}, etc.
+ Serialization of more complex data is accomplished by breaking up
+ the data into primitive units.
+
+ A data stream cooperates closely with a QIODevice. A QIODevice
+ represents an input/output medium one can read data from and write
+ data to. The QFile class is an example of an I/O device.
+
+ Example (write binary data to a stream):
+
+ \snippet doc/src/snippets/code/src_corelib_io_qdatastream.cpp 0
+
+ Example (read binary data from a stream):
+
+ \snippet doc/src/snippets/code/src_corelib_io_qdatastream.cpp 1
+
+ Each item written to the stream is written in a predefined binary
+ format that varies depending on the item's type. Supported Qt
+ types include QBrush, QColor, QDateTime, QFont, QPixmap, QString,
+ QVariant and many others. For the complete list of all Qt types
+ supporting data streaming see \l{Serializing Qt Data Types}.
+
+ For integers it is best to always cast to a Qt integer type for
+ writing, and to read back into the same Qt integer type. This
+ ensures that you get integers of the size you want and insulates
+ you from compiler and platform differences.
+
+ To take one example, a \c{char *} string is written as a 32-bit
+ integer equal to the length of the string including the '\\0' byte,
+ followed by all the characters of the string including the
+ '\\0' byte. When reading a \c{char *} string, 4 bytes are read to
+ create the 32-bit length value, then that many characters for the
+ \c {char *} string including the '\\0' terminator are read.
+
+ The initial I/O device is usually set in the constructor, but can be
+ changed with setDevice(). If you've reached the end of the data
+ (or if there is no I/O device set) atEnd() will return true.
+
+ \section1 Versioning
+
+ QDataStream's binary format has evolved since Qt 1.0, and is
+ likely to continue evolving to reflect changes done in Qt. When
+ inputting or outputting complex types, it's very important to
+ make sure that the same version of the stream (version()) is used
+ for reading and writing. If you need both forward and backward
+ compatibility, you can hardcode the version number in the
+ application:
+
+ \snippet doc/src/snippets/code/src_corelib_io_qdatastream.cpp 2
+
+ If you are producing a new binary data format, such as a file
+ format for documents created by your application, you could use a
+ QDataStream to write the data in a portable format. Typically, you
+ would write a brief header containing a magic string and a version
+ number to give yourself room for future expansion. For example:
+
+ \snippet doc/src/snippets/code/src_corelib_io_qdatastream.cpp 3
+
+ Then read it in with:
+
+ \snippet doc/src/snippets/code/src_corelib_io_qdatastream.cpp 4
+
+ You can select which byte order to use when serializing data. The
+ default setting is big endian (MSB first). Changing it to little
+ endian breaks the portability (unless the reader also changes to
+ little endian). We recommend keeping this setting unless you have
+ special requirements.
+
+ \target raw
+ \section1 Reading and writing raw binary data
+
+ You may wish to read/write your own raw binary data to/from the
+ data stream directly. Data may be read from the stream into a
+ preallocated \c{char *} using readRawData(). Similarly data can be
+ written to the stream using writeRawData(). Note that any
+ encoding/decoding of the data must be done by you.
+
+ A similar pair of functions is readBytes() and writeBytes(). These
+ differ from their \e raw counterparts as follows: readBytes()
+ reads a quint32 which is taken to be the length of the data to be
+ read, then that number of bytes is read into the preallocated
+ \c{char *}; writeBytes() writes a quint32 containing the length of the
+ data, followed by the data. Note that any encoding/decoding of
+ the data (apart from the length quint32) must be done by you.
+
+ \section1 Reading and writing Qt collection classes
+
+ The Qt container classes can also be serialized to a QDataStream.
+ These include QList, QLinkedList, QVector, QSet, QHash, and QMap.
+ The stream operators are declared as non-members of the classes.
+
+ \target Serializing Qt Classes
+ \section1 Reading and writing other Qt classes.
+
+ In addition to the overloaded stream operators documented here,
+ any Qt classes that you might want to serialize to a QDataStream
+ will have appropriate stream operators declared as non-member of
+ the class:
+
+ \code
+ QDataStream &operator<<(QDataStream &, const QXxx &);
+ QDataStream &operator>>(QDataStream &, QXxx &);
+ \endcode
+
+ For example, here are the stream operators declared as non-members
+ of the QImage class:
+
+ \code
+ QDataStream & operator<< (QDataStream& stream, const QImage& image);
+ QDataStream & operator>> (QDataStream& stream, QImage& image);
+ \endcode
+
+ To see if your favorite Qt class has similar stream operators
+ defined, check the \bold {Related Non-Members} section of the
+ class's documentation page.
+
+ \sa QTextStream QVariant
+*/
+
+/*!
+ \enum QDataStream::ByteOrder
+
+ The byte order used for reading/writing the data.
+
+ \value BigEndian Most significant byte first (the default)
+ \value LittleEndian Least significant byte first
+*/
+
+/*!
+ \enum QDataStream::FloatingPointPrecision
+
+ The precision of floating point numbers used for reading/writing the data. This will only have
+ an effect if the version of the data stream is Qt_4_6 or higher.
+
+ \warning The floating point precision must be set to the same value on the object that writes
+ and the object that reads the data stream.
+
+ \value SinglePrecision All floating point numbers in the data stream have 32-bit precision.
+ \value DoublePrecision All floating point numbers in the data stream have 64-bit precision.
+
+ \sa setFloatingPointPrecision(), floatingPointPrecision()
+*/
+
+/*!
+ \enum QDataStream::Status
+
+ This enum describes the current status of the data stream.
+
+ \value Ok The data stream is operating normally.
+ \value ReadPastEnd The data stream has read past the end of the
+ data in the underlying device.
+ \value ReadCorruptData The data stream has read corrupt data.
+ \value WriteFailed The data stream cannot write to the underlying device.
+*/
+
+/*****************************************************************************
+ QDataStream member functions
+ *****************************************************************************/
+
+#undef CHECK_STREAM_PRECOND
+#ifndef QT_NO_DEBUG
+#define CHECK_STREAM_PRECOND(retVal) \
+ if (!dev) { \
+ qWarning("QDataStream: No device"); \
+ return retVal; \
+ }
+#else
+#define CHECK_STREAM_PRECOND(retVal) \
+ if (!dev) { \
+ return retVal; \
+ }
+#endif
+
+#define CHECK_STREAM_WRITE_PRECOND(retVal) \
+ CHECK_STREAM_PRECOND(retVal) \
+ if (q_status != Ok) \
+ return retVal;
+
+enum {
+ DefaultStreamVersion = QDataStream::Qt_4_6
+};
+
+// ### 5.0: when streaming invalid QVariants, just the type should
+// be written, no "data" after it
+
+/*!
+ Constructs a data stream that has no I/O device.
+
+ \sa setDevice()
+*/
+
+QDataStream::QDataStream()
+{
+ dev = 0;
+ owndev = false;
+ byteorder = BigEndian;
+ ver = DefaultStreamVersion;
+ noswap = QSysInfo::ByteOrder == QSysInfo::BigEndian;
+ q_status = Ok;
+}
+
+/*!
+ Constructs a data stream that uses the I/O device \a d.
+
+ \warning If you use QSocket or QSocketDevice as the I/O device \a d
+ for reading data, you must make sure that enough data is available
+ on the socket for the operation to successfully proceed;
+ QDataStream does not have any means to handle or recover from
+ short-reads.
+
+ \sa setDevice(), device()
+*/
+
+QDataStream::QDataStream(QIODevice *d)
+{
+ dev = d; // set device
+ owndev = false;
+ byteorder = BigEndian; // default byte order
+ ver = DefaultStreamVersion;
+ noswap = QSysInfo::ByteOrder == QSysInfo::BigEndian;
+ q_status = Ok;
+}
+
+#ifdef QT3_SUPPORT
+/*!
+ \fn QDataStream::QDataStream(QByteArray *array, int mode)
+ \compat
+
+ Constructs a data stream that operates on the given \a array. The
+ \a mode specifies how the byte array is to be used, and is
+ usually either QIODevice::ReadOnly or QIODevice::WriteOnly.
+*/
+QDataStream::QDataStream(QByteArray *a, int mode)
+{
+ QBuffer *buf = new QBuffer(a);
+#ifndef QT_NO_QOBJECT
+ buf->blockSignals(true);
+#endif
+ buf->open(QIODevice::OpenMode(mode));
+ dev = buf;
+ owndev = true;
+ byteorder = BigEndian;
+ ver = DefaultStreamVersion;
+ noswap = QSysInfo::ByteOrder == QSysInfo::BigEndian;
+ q_status = Ok;
+}
+#endif
+
+/*!
+ \fn QDataStream::QDataStream(QByteArray *a, QIODevice::OpenMode mode)
+
+ Constructs a data stream that operates on a byte array, \a a. The
+ \a mode describes how the device is to be used.
+
+ Alternatively, you can use QDataStream(const QByteArray &) if you
+ just want to read from a byte array.
+
+ Since QByteArray is not a QIODevice subclass, internally a QBuffer
+ is created to wrap the byte array.
+*/
+
+QDataStream::QDataStream(QByteArray *a, QIODevice::OpenMode flags)
+{
+ QBuffer *buf = new QBuffer(a);
+#ifndef QT_NO_QOBJECT
+ buf->blockSignals(true);
+#endif
+ buf->open(flags);
+ dev = buf;
+ owndev = true;
+ byteorder = BigEndian;
+ ver = DefaultStreamVersion;
+ noswap = QSysInfo::ByteOrder == QSysInfo::BigEndian;
+ q_status = Ok;
+}
+
+/*!
+ Constructs a read-only data stream that operates on byte array \a a.
+ Use QDataStream(QByteArray*, int) if you want to write to a byte
+ array.
+
+ Since QByteArray is not a QIODevice subclass, internally a QBuffer
+ is created to wrap the byte array.
+*/
+QDataStream::QDataStream(const QByteArray &a)
+{
+ QBuffer *buf = new QBuffer;
+#ifndef QT_NO_QOBJECT
+ buf->blockSignals(true);
+#endif
+ buf->setData(a);
+ buf->open(QIODevice::ReadOnly);
+ dev = buf;
+ owndev = true;
+ byteorder = BigEndian;
+ ver = DefaultStreamVersion;
+ noswap = QSysInfo::ByteOrder == QSysInfo::BigEndian;
+ q_status = Ok;
+}
+
+/*!
+ Destroys the data stream.
+
+ The destructor will not affect the current I/O device, unless it is
+ an internal I/O device (e.g. a QBuffer) processing a QByteArray
+ passed in the \e constructor, in which case the internal I/O device
+ is destroyed.
+*/
+
+QDataStream::~QDataStream()
+{
+ if (owndev)
+ delete dev;
+}
+
+
+/*!
+ \fn QIODevice *QDataStream::device() const
+
+ Returns the I/O device currently set, or 0 if no
+ device is currently set.
+
+ \sa setDevice()
+*/
+
+/*!
+ void QDataStream::setDevice(QIODevice *d)
+
+ Sets the I/O device to \a d, which can be 0
+ to unset to current I/O device.
+
+ \sa device()
+*/
+
+void QDataStream::setDevice(QIODevice *d)
+{
+ if (owndev) {
+ delete dev;
+ owndev = false;
+ }
+ dev = d;
+}
+
+/*!
+ \obsolete
+ Unsets the I/O device.
+ Use setDevice(0) instead.
+*/
+
+void QDataStream::unsetDevice()
+{
+ setDevice(0);
+}
+
+
+/*!
+ \fn bool QDataStream::atEnd() const
+
+ Returns true if the I/O device has reached the end position (end of
+ the stream or file) or if there is no I/O device set; otherwise
+ returns false.
+
+ \sa QIODevice::atEnd()
+*/
+
+bool QDataStream::atEnd() const
+{
+ return dev ? dev->atEnd() : true;
+}
+
+/*!
+ Returns the floating point precision of the data stream.
+
+ \since 4.6
+
+ \sa FloatingPointPrecision setFloatingPointPrecision()
+*/
+QDataStream::FloatingPointPrecision QDataStream::floatingPointPrecision() const
+{
+ return d == 0 ? QDataStream::DoublePrecision : d->floatingPointPrecision;
+}
+
+/*!
+ Sets the floating point precision of the data stream to \a precision. If the floating point precision is
+ DoublePrecision and the version of the data stream is Qt_4_6 or higher, all floating point
+ numbers will be written and read with 64-bit precision. If the floating point precision is
+ SinglePrecision and the version is Qt_4_6 or higher, all floating point numbers will be written
+ and read with 32-bit precision.
+
+ For versions prior to Qt_4_6, the precision of floating point numbers in the data stream depends
+ on the stream operator called.
+
+ The default is DoublePrecision.
+
+ \warning This property must be set to the same value on the object that writes and the object
+ that reads the data stream.
+
+ \since 4.6
+*/
+void QDataStream::setFloatingPointPrecision(QDataStream::FloatingPointPrecision precision)
+{
+ if (d == 0)
+ d.reset(new QDataStreamPrivate());
+ d->floatingPointPrecision = precision;
+}
+
+/*!
+ Returns the status of the data stream.
+
+ \sa Status setStatus() resetStatus()
+*/
+
+QDataStream::Status QDataStream::status() const
+{
+ return q_status;
+}
+
+/*!
+ Resets the status of the data stream.
+
+ \sa Status status() setStatus()
+*/
+void QDataStream::resetStatus()
+{
+ q_status = Ok;
+}
+
+/*!
+ Sets the status of the data stream to the \a status given.
+
+ Subsequent calls to setStatus() are ignored until resetStatus()
+ is called.
+
+ \sa Status status() resetStatus()
+*/
+void QDataStream::setStatus(Status status)
+{
+ if (q_status == Ok)
+ q_status = status;
+}
+
+/*!\fn bool QDataStream::eof() const
+
+ Use atEnd() instead.
+*/
+
+/*!
+ \fn int QDataStream::byteOrder() const
+
+ Returns the current byte order setting -- either BigEndian or
+ LittleEndian.
+
+ \sa setByteOrder()
+*/
+
+/*!
+ Sets the serialization byte order to \a bo.
+
+ The \a bo parameter can be QDataStream::BigEndian or
+ QDataStream::LittleEndian.
+
+ The default setting is big endian. We recommend leaving this
+ setting unless you have special requirements.
+
+ \sa byteOrder()
+*/
+
+void QDataStream::setByteOrder(ByteOrder bo)
+{
+ byteorder = bo;
+ if (QSysInfo::ByteOrder == QSysInfo::BigEndian)
+ noswap = (byteorder == BigEndian);
+ else
+ noswap = (byteorder == LittleEndian);
+}
+
+
+/*!
+ \fn bool QDataStream::isPrintableData() const
+
+ In Qt 4, this function always returns false.
+
+ \sa setPrintableData()
+*/
+
+/*!
+ \fn void QDataStream::setPrintableData(bool enable)
+
+ In Qt 3, this function enabled output in a human-readable
+ format if \a enable was false.
+
+ In Qt 4, QDataStream no longer provides a human-readable output.
+ This function does nothing.
+*/
+
+/*!
+ \enum QDataStream::Version
+
+ This enum provides symbolic synonyms for the data serialization
+ format version numbers.
+
+ \value Qt_1_0 Version 1 (Qt 1.x)
+ \value Qt_2_0 Version 2 (Qt 2.0)
+ \value Qt_2_1 Version 3 (Qt 2.1, 2.2, 2.3)
+ \value Qt_3_0 Version 4 (Qt 3.0)
+ \value Qt_3_1 Version 5 (Qt 3.1, 3.2)
+ \value Qt_3_3 Version 6 (Qt 3.3)
+ \value Qt_4_0 Version 7 (Qt 4.0, Qt 4.1)
+ \value Qt_4_1 Version 7 (Qt 4.0, Qt 4.1)
+ \value Qt_4_2 Version 8 (Qt 4.2)
+ \value Qt_4_3 Version 9 (Qt 4.3)
+ \value Qt_4_4 Version 10 (Qt 4.4)
+ \value Qt_4_5 Version 11 (Qt 4.5)
+ \value Qt_4_6 Version 12 (Qt 4.6)
+ \value Qt_4_7 Same as Qt_4_6.
+
+ \sa setVersion(), version()
+*/
+
+/*!
+ \fn int QDataStream::version() const
+
+ Returns the version number of the data serialization format.
+
+ \sa setVersion(), Version
+*/
+
+/*!
+ \fn void QDataStream::setVersion(int v)
+
+ Sets the version number of the data serialization format to \a v.
+
+ You don't \e have to set a version if you are using the current
+ version of Qt, but for your own custom binary formats we
+ recommend that you do; see \l{Versioning} in the Detailed
+ Description.
+
+ To accommodate new functionality, the datastream serialization
+ format of some Qt classes has changed in some versions of Qt. If
+ you want to read data that was created by an earlier version of
+ Qt, or write data that can be read by a program that was compiled
+ with an earlier version of Qt, use this function to modify the
+ serialization format used by QDataStream.
+
+ \table
+ \header \i Qt Version \i QDataStream Version
+ \row \i Qt 4.6 \i 12
+ \row \i Qt 4.5 \i 11
+ \row \i Qt 4.4 \i 10
+ \row \i Qt 4.3 \i 9
+ \row \i Qt 4.2 \i 8
+ \row \i Qt 4.0, 4.1 \i 7
+ \row \i Qt 3.3 \i 6
+ \row \i Qt 3.1, 3.2 \i 5
+ \row \i Qt 3.0 \i 4
+ \row \i Qt 2.1, 2.2, 2.3 \i 3
+ \row \i Qt 2.0 \i 2
+ \row \i Qt 1.x \i 1
+ \endtable
+
+ The \l Version enum provides symbolic constants for the different
+ versions of Qt. For example:
+
+ \snippet doc/src/snippets/code/src_corelib_io_qdatastream.cpp 5
+
+ \sa version(), Version
+*/
+
+/*****************************************************************************
+ QDataStream read functions
+ *****************************************************************************/
+
+/*!
+ \fn QDataStream &QDataStream::operator>>(quint8 &i)
+ \overload
+
+ Reads an unsigned byte from the stream into \a i, and returns a
+ reference to the stream.
+*/
+
+/*!
+ Reads a signed byte from the stream into \a i, and returns a
+ reference to the stream.
+*/
+
+QDataStream &QDataStream::operator>>(qint8 &i)
+{
+ i = 0;
+ CHECK_STREAM_PRECOND(*this)
+ char c;
+ if (!dev->getChar(&c))
+ setStatus(ReadPastEnd);
+ else
+ i = qint8(c);
+ return *this;
+}
+
+
+/*!
+ \fn QDataStream &QDataStream::operator>>(quint16 &i)
+ \overload
+
+ Reads an unsigned 16-bit integer from the stream into \a i, and
+ returns a reference to the stream.
+*/
+
+/*!
+ \overload
+
+ Reads a signed 16-bit integer from the stream into \a i, and
+ returns a reference to the stream.
+*/
+
+QDataStream &QDataStream::operator>>(qint16 &i)
+{
+ i = 0;
+ CHECK_STREAM_PRECOND(*this)
+ if (dev->read((char *)&i, 2) != 2) {
+ i = 0;
+ setStatus(ReadPastEnd);
+ } else {
+ if (!noswap) {
+ i = qbswap(i);
+ }
+ }
+ return *this;
+}
+
+
+/*!
+ \fn QDataStream &QDataStream::operator>>(quint32 &i)
+ \overload
+
+ Reads an unsigned 32-bit integer from the stream into \a i, and
+ returns a reference to the stream.
+*/
+
+/*!
+ \overload
+
+ Reads a signed 32-bit integer from the stream into \a i, and
+ returns a reference to the stream.
+*/
+
+QDataStream &QDataStream::operator>>(qint32 &i)
+{
+ i = 0;
+ CHECK_STREAM_PRECOND(*this)
+ if (dev->read((char *)&i, 4) != 4) {
+ i = 0;
+ setStatus(ReadPastEnd);
+ } else {
+ if (!noswap) {
+ i = qbswap(i);
+ }
+ }
+ return *this;
+}
+
+/*!
+ \fn QDataStream &QDataStream::operator>>(quint64 &i)
+ \overload
+
+ Reads an unsigned 64-bit integer from the stream, into \a i, and
+ returns a reference to the stream.
+*/
+
+/*!
+ \overload
+
+ Reads a signed 64-bit integer from the stream into \a i, and
+ returns a reference to the stream.
+*/
+
+QDataStream &QDataStream::operator>>(qint64 &i)
+{
+ i = qint64(0);
+ CHECK_STREAM_PRECOND(*this)
+ if (version() < 6) {
+ quint32 i1, i2;
+ *this >> i2 >> i1;
+ i = ((quint64)i1 << 32) + i2;
+ } else {
+ if (dev->read((char *)&i, 8) != 8) {
+ i = qint64(0);
+ setStatus(ReadPastEnd);
+ } else {
+ if (!noswap) {
+ i = qbswap(i);
+ }
+ }
+ }
+ return *this;
+}
+
+/*!
+ Reads a boolean value from the stream into \a i. Returns a
+ reference to the stream.
+*/
+QDataStream &QDataStream::operator>>(bool &i)
+{
+ qint8 v;
+ *this >> v;
+ i = !!v;
+ return *this;
+}
+
+/*!
+ \overload
+
+ Reads a floating point number from the stream into \a f,
+ using the standard IEEE 754 format. Returns a reference to the
+ stream.
+
+ \sa setFloatingPointPrecision()
+*/
+
+QDataStream &QDataStream::operator>>(float &f)
+{
+ if (version() >= QDataStream::Qt_4_6
+ && floatingPointPrecision() == QDataStream::DoublePrecision) {
+ double d;
+ *this >> d;
+ f = d;
+ return *this;
+ }
+
+ f = 0.0f;
+ CHECK_STREAM_PRECOND(*this)
+ if (dev->read((char *)&f, 4) != 4) {
+ f = 0.0f;
+ setStatus(ReadPastEnd);
+ } else {
+ if (!noswap) {
+ union {
+ float val1;
+ quint32 val2;
+ } x;
+ x.val2 = qbswap(*reinterpret_cast<quint32 *>(&f));
+ f = x.val1;
+ }
+ }
+ return *this;
+}
+
+#if defined(Q_DOUBLE_FORMAT)
+#define Q_DF(x) Q_DOUBLE_FORMAT[(x)] - '0'
+#endif
+
+/*!
+ \overload
+
+ Reads a floating point number from the stream into \a f,
+ using the standard IEEE 754 format. Returns a reference to the
+ stream.
+
+ \sa setFloatingPointPrecision()
+*/
+
+QDataStream &QDataStream::operator>>(double &f)
+{
+ if (version() >= QDataStream::Qt_4_6
+ && floatingPointPrecision() == QDataStream::SinglePrecision) {
+ float d;
+ *this >> d;
+ f = d;
+ return *this;
+ }
+
+ f = 0.0;
+ CHECK_STREAM_PRECOND(*this)
+#ifndef Q_DOUBLE_FORMAT
+ if (dev->read((char *)&f, 8) != 8) {
+ f = 0.0;
+ setStatus(ReadPastEnd);
+ } else {
+ if (!noswap) {
+ union {
+ double val1;
+ quint64 val2;
+ } x;
+ x.val2 = qbswap(*reinterpret_cast<quint64 *>(&f));
+ f = x.val1;
+ }
+ }
+#else
+ //non-standard floating point format
+ union {
+ double val1;
+ char val2[8];
+ } x;
+ char *p = x.val2;
+ char b[8];
+ if (dev->read(b, 8) == 8) {
+ if (noswap) {
+ *p++ = b[Q_DF(0)];
+ *p++ = b[Q_DF(1)];
+ *p++ = b[Q_DF(2)];
+ *p++ = b[Q_DF(3)];
+ *p++ = b[Q_DF(4)];
+ *p++ = b[Q_DF(5)];
+ *p++ = b[Q_DF(6)];
+ *p = b[Q_DF(7)];
+ } else {
+ *p++ = b[Q_DF(7)];
+ *p++ = b[Q_DF(6)];
+ *p++ = b[Q_DF(5)];
+ *p++ = b[Q_DF(4)];
+ *p++ = b[Q_DF(3)];
+ *p++ = b[Q_DF(2)];
+ *p++ = b[Q_DF(1)];
+ *p = b[Q_DF(0)];
+ }
+ f = x.val1;
+ } else {
+ setStatus(ReadPastEnd);
+ }
+#endif
+ return *this;
+}
+
+
+/*!
+ \overload
+
+ Reads the '\0'-terminated string \a s from the stream and returns
+ a reference to the stream.
+
+ Space for the string is allocated using \c new -- the caller must
+ destroy it with \c{delete[]}.
+*/
+
+QDataStream &QDataStream::operator>>(char *&s)
+{
+ uint len = 0;
+ return readBytes(s, len);
+}
+
+
+/*!
+ Reads the buffer \a s from the stream and returns a reference to
+ the stream.
+
+ The buffer \a s is allocated using \c new. Destroy it with the \c
+ delete[] operator.
+
+ The \a l parameter is set to the length of the buffer. If the
+ string read is empty, \a l is set to 0 and \a s is set to
+ a null pointer.
+
+ The serialization format is a quint32 length specifier first,
+ then \a l bytes of data.
+
+ \sa readRawData(), writeBytes()
+*/
+
+QDataStream &QDataStream::readBytes(char *&s, uint &l)
+{
+ s = 0;
+ l = 0;
+ CHECK_STREAM_PRECOND(*this)
+
+ quint32 len;
+ *this >> len;
+ if (len == 0)
+ return *this;
+
+ const quint32 Step = 1024 * 1024;
+ quint32 allocated = 0;
+ char *prevBuf = 0;
+ char *curBuf = 0;
+
+ do {
+ int blockSize = qMin(Step, len - allocated);
+ prevBuf = curBuf;
+ curBuf = new char[allocated + blockSize + 1];
+ if (prevBuf) {
+ memcpy(curBuf, prevBuf, allocated);
+ delete [] prevBuf;
+ }
+ if (dev->read(curBuf + allocated, blockSize) != blockSize) {
+ delete [] curBuf;
+ setStatus(ReadPastEnd);
+ return *this;
+ }
+ allocated += blockSize;
+ } while (allocated < len);
+
+ s = curBuf;
+ s[len] = '\0';
+ l = (uint)len;
+ return *this;
+}
+
+/*!
+ Reads at most \a len bytes from the stream into \a s and returns the number of
+ bytes read. If an error occurs, this function returns -1.
+
+ The buffer \a s must be preallocated. The data is \e not encoded.
+
+ \sa readBytes(), QIODevice::read(), writeRawData()
+*/
+
+int QDataStream::readRawData(char *s, int len)
+{
+ CHECK_STREAM_PRECOND(-1)
+ return dev->read(s, len);
+}
+
+
+/*****************************************************************************
+ QDataStream write functions
+ *****************************************************************************/
+
+
+/*!
+ \fn QDataStream &QDataStream::operator<<(quint8 i)
+ \overload
+
+ Writes an unsigned byte, \a i, to the stream and returns a
+ reference to the stream.
+*/
+
+/*!
+ Writes a signed byte, \a i, to the stream and returns a reference
+ to the stream.
+*/
+
+QDataStream &QDataStream::operator<<(qint8 i)
+{
+ CHECK_STREAM_WRITE_PRECOND(*this)
+ if (!dev->putChar(i))
+ q_status = WriteFailed;
+ return *this;
+}
+
+
+/*!
+ \fn QDataStream &QDataStream::operator<<(quint16 i)
+ \overload
+
+ Writes an unsigned 16-bit integer, \a i, to the stream and returns
+ a reference to the stream.
+*/
+
+/*!
+ \overload
+
+ Writes a signed 16-bit integer, \a i, to the stream and returns a
+ reference to the stream.
+*/
+
+QDataStream &QDataStream::operator<<(qint16 i)
+{
+ CHECK_STREAM_WRITE_PRECOND(*this)
+ if (!noswap) {
+ i = qbswap(i);
+ }
+ if (dev->write((char *)&i, sizeof(qint16)) != sizeof(qint16))
+ q_status = WriteFailed;
+ return *this;
+}
+
+/*!
+ \overload
+
+ Writes a signed 32-bit integer, \a i, to the stream and returns a
+ reference to the stream.
+*/
+
+QDataStream &QDataStream::operator<<(qint32 i)
+{
+ CHECK_STREAM_WRITE_PRECOND(*this)
+ if (!noswap) {
+ i = qbswap(i);
+ }
+ if (dev->write((char *)&i, sizeof(qint32)) != sizeof(qint32))
+ q_status = WriteFailed;
+ return *this;
+}
+
+/*!
+ \fn QDataStream &QDataStream::operator<<(quint64 i)
+ \overload
+
+ Writes an unsigned 64-bit integer, \a i, to the stream and returns a
+ reference to the stream.
+*/
+
+/*!
+ \overload
+
+ Writes a signed 64-bit integer, \a i, to the stream and returns a
+ reference to the stream.
+*/
+
+QDataStream &QDataStream::operator<<(qint64 i)
+{
+ CHECK_STREAM_WRITE_PRECOND(*this)
+ if (version() < 6) {
+ quint32 i1 = i & 0xffffffff;
+ quint32 i2 = i >> 32;
+ *this << i2 << i1;
+ } else {
+ if (!noswap) {
+ i = qbswap(i);
+ }
+ if (dev->write((char *)&i, sizeof(qint64)) != sizeof(qint64))
+ q_status = WriteFailed;
+ }
+ return *this;
+}
+
+/*!
+ \fn QDataStream &QDataStream::operator<<(quint32 i)
+ \overload
+
+ Writes an unsigned integer, \a i, to the stream as a 32-bit
+ unsigned integer (quint32). Returns a reference to the stream.
+*/
+
+/*!
+ Writes a boolean value, \a i, to the stream. Returns a reference
+ to the stream.
+*/
+
+QDataStream &QDataStream::operator<<(bool i)
+{
+ CHECK_STREAM_WRITE_PRECOND(*this)
+ if (!dev->putChar(qint8(i)))
+ q_status = WriteFailed;
+ return *this;
+}
+
+/*!
+ \overload
+
+ Writes a floating point number, \a f, to the stream using
+ the standard IEEE 754 format. Returns a reference to the stream.
+
+ \sa setFloatingPointPrecision()
+*/
+
+QDataStream &QDataStream::operator<<(float f)
+{
+ if (version() >= QDataStream::Qt_4_6
+ && floatingPointPrecision() == QDataStream::DoublePrecision) {
+ *this << double(f);
+ return *this;
+ }
+
+ CHECK_STREAM_WRITE_PRECOND(*this)
+ float g = f; // fixes float-on-stack problem
+ if (!noswap) {
+ union {
+ float val1;
+ quint32 val2;
+ } x;
+ x.val1 = g;
+ x.val2 = qbswap(x.val2);
+ g = x.val1;
+ }
+ if (dev->write((char *)&g, sizeof(float)) != sizeof(float))
+ q_status = WriteFailed;
+ return *this;
+}
+
+
+/*!
+ \overload
+
+ Writes a floating point number, \a f, to the stream using
+ the standard IEEE 754 format. Returns a reference to the stream.
+
+ \sa setFloatingPointPrecision()
+*/
+
+QDataStream &QDataStream::operator<<(double f)
+{
+ if (version() >= QDataStream::Qt_4_6
+ && floatingPointPrecision() == QDataStream::SinglePrecision) {
+ *this << float(f);
+ return *this;
+ }
+
+ CHECK_STREAM_WRITE_PRECOND(*this)
+#ifndef Q_DOUBLE_FORMAT
+ if (noswap) {
+ if (dev->write((char *)&f, sizeof(double)) != sizeof(double))
+ q_status = WriteFailed;
+ } else {
+ union {
+ double val1;
+ quint64 val2;
+ } x;
+ x.val1 = f;
+ x.val2 = qbswap(x.val2);
+ if (dev->write((char *)&x.val2, sizeof(double)) != sizeof(double))
+ q_status = WriteFailed;
+ }
+#else
+ union {
+ double val1;
+ char val2[8];
+ } x;
+ x.val1 = f;
+ char *p = x.val2;
+ char b[8];
+ if (noswap) {
+ b[Q_DF(0)] = *p++;
+ b[Q_DF(1)] = *p++;
+ b[Q_DF(2)] = *p++;
+ b[Q_DF(3)] = *p++;
+ b[Q_DF(4)] = *p++;
+ b[Q_DF(5)] = *p++;
+ b[Q_DF(6)] = *p++;
+ b[Q_DF(7)] = *p;
+ } else {
+ b[Q_DF(7)] = *p++;
+ b[Q_DF(6)] = *p++;
+ b[Q_DF(5)] = *p++;
+ b[Q_DF(4)] = *p++;
+ b[Q_DF(3)] = *p++;
+ b[Q_DF(2)] = *p++;
+ b[Q_DF(1)] = *p++;
+ b[Q_DF(0)] = *p;
+ }
+ if (dev->write(b, 8) != 8)
+ q_status = WriteFailed;
+#endif
+ return *this;
+}
+
+
+/*!
+ \overload
+
+ Writes the '\0'-terminated string \a s to the stream and returns a
+ reference to the stream.
+
+ The string is serialized using writeBytes().
+*/
+
+QDataStream &QDataStream::operator<<(const char *s)
+{
+ if (!s) {
+ *this << (quint32)0;
+ return *this;
+ }
+ uint len = qstrlen(s) + 1; // also write null terminator
+ *this << (quint32)len; // write length specifier
+ writeRawData(s, len);
+ return *this;
+}
+
+
+/*!
+ Writes the length specifier \a len and the buffer \a s to the
+ stream and returns a reference to the stream.
+
+ The \a len is serialized as a quint32, followed by \a len bytes
+ from \a s. Note that the data is \e not encoded.
+
+ \sa writeRawData(), readBytes()
+*/
+
+QDataStream &QDataStream::writeBytes(const char *s, uint len)
+{
+ CHECK_STREAM_WRITE_PRECOND(*this)
+ *this << (quint32)len; // write length specifier
+ if (len)
+ writeRawData(s, len);
+ return *this;
+}
+
+
+/*!
+ Writes \a len bytes from \a s to the stream. Returns the
+ number of bytes actually written, or -1 on error.
+ The data is \e not encoded.
+
+ \sa writeBytes(), QIODevice::write(), readRawData()
+*/
+
+int QDataStream::writeRawData(const char *s, int len)
+{
+ CHECK_STREAM_WRITE_PRECOND(-1)
+ int ret = dev->write(s, len);
+ if (ret != len)
+ q_status = WriteFailed;
+ return ret;
+}
+
+/*!
+ \since 4.1
+
+ Skips \a len bytes from the device. Returns the number of bytes
+ actually skipped, or -1 on error.
+
+ This is equivalent to calling readRawData() on a buffer of length
+ \a len and ignoring the buffer.
+
+ \sa QIODevice::seek()
+*/
+int QDataStream::skipRawData(int len)
+{
+ CHECK_STREAM_PRECOND(-1)
+
+ if (dev->isSequential()) {
+ char buf[4096];
+ int sumRead = 0;
+
+ while (len > 0) {
+ int blockSize = qMin(len, (int)sizeof(buf));
+ int n = dev->read(buf, blockSize);
+ if (n == -1)
+ return -1;
+ if (n == 0)
+ return sumRead;
+
+ sumRead += n;
+ len -= blockSize;
+ }
+ return sumRead;
+ } else {
+ qint64 pos = dev->pos();
+ qint64 size = dev->size();
+ if (pos + len > size)
+ len = size - pos;
+ if (!dev->seek(pos + len))
+ return -1;
+ return len;
+ }
+}
+
+#ifdef QT3_SUPPORT
+/*!
+ \fn QDataStream &QDataStream::readRawBytes(char *str, uint len)
+
+ Use readRawData() instead.
+*/
+
+/*!
+ \fn QDataStream &QDataStream::writeRawBytes(const char *str, uint len)
+
+ Use writeRawData() instead.
+*/
+#endif
+
+QT_END_NAMESPACE
+
+#endif // QT_NO_DATASTREAM