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+/****************************************************************************
+**
+**
+** Implementation of QDataStream class
+**
+** Created : 930831
+**
+** Copyright (C) 1992-2000 Trolltech AS. All rights reserved.
+**
+** This file is part of the tools module of the Qt GUI Toolkit.
+**
+** This file may be distributed under the terms of the Q Public License
+** as defined by Trolltech AS of Norway and appearing in the file
+** LICENSE.QPL included in the packaging of this file.
+**
+** This file may be distributed and/or modified under the terms of the
+** GNU General Public License version 2 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.
+**
+** Licensees holding valid Qt Enterprise Edition or Qt Professional Edition
+** licenses may use this file in accordance with the Qt Commercial License
+** Agreement provided with the Software.
+**
+** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
+** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+**
+** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
+** information about Qt Commercial License Agreements.
+** See http://www.trolltech.com/qpl/ for QPL licensing information.
+** See http://www.trolltech.com/gpl/ for GPL licensing information.
+**
+** Contact info@trolltech.com if any conditions of this licensing are
+** not clear to you.
+**
+**********************************************************************/
+
+#include "qdatastream.h"
+
+#ifndef QT_NO_DATASTREAM
+#include "qbuffer.h"
+#include <stdio.h>
+#include <ctype.h>
+#include <stdlib.h>
+
+// REVISED: warwick
+/*!
+ \class QDataStream qdatastream.h
+
+ \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 operation system, CPU or byte order. A
+ stream that is written by a PC under DOS/Windows can be read by a
+ Sun SPARC running Solaris.
+
+ The QDataStream class implements serialization of primitive 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.
+
+ The programmer 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.
+
+ 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 IO device.
+
+ Example (write data to a stream):
+ \code
+ QFile f( "file.dta" );
+ f.open( IO_WriteOnly ); // open file for writing
+ QDataStream s( &f ); // serialize using f
+ s << "the answer is"; // serialize string
+ s << (Q_INT32)42; // serialize integer
+ \endcode
+
+ Example (read data from a stream):
+ \code
+ QFile f( "file.dta" );
+ f.open( IO_ReadOnly ); // open file for reading
+ QDataStream s( &f ); // serialize using f
+ char *str;
+ Q_INT32 a;
+ s >> str >> a; // "the answer is" and 42
+ delete str; // delete string
+ \endcode
+
+ In the last example, if you read into a QString instead of a \c char*
+ you do not have to delete it.
+
+ Normally, each item written to the stream is written in a fixed binary
+ format.
+ For example, a \c char* is written as a 32-bit integer equal to the
+ length of the string including the NUL byte, followed by all the
+ characters of the string including the NUL byte. Similarly when
+ reading a string, 4 bytes are read to create the 32-bit length value,
+ then that many characters for the string including the NUL. For a complete
+ description of all Qt types supporting data streaming see \link
+ datastreamformat.html Format of the QDataStream operators \endlink .
+
+ If you want a "parsing" input stream, see QTextStream. If you just want the
+ data to be human-readable to aid in debugging, you can set the data
+ stream into printable data mode with setPrintableData(). The data is
+ then written slower, in a human readable bloated form that is sufficient
+ for debugging.
+
+ 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:
+
+ \code
+ // Open the file.
+ QFile f( "file.xxx" );
+ f.open( IO_WriteOnly );
+ QDataStream s( &f );
+
+ // Write a header with a "magic number" and a version
+ s << 0xa0b0c0d0;
+ s << 123;
+
+ // Write the data
+ s << [lots of interesting data]
+ \endcode
+
+ Then read it in with:
+
+ \code
+ // Open the file.
+ QFile f( "file.xxx" );
+ f.open( IO_ReadOnly );
+ QDataStream s( &f );
+
+ // Read and check the header
+ Q_UINT32 magic;
+ s >> magic;
+ if ( magic != 0xa0b0c0d0 )
+ return XXX_BAD_FILE_FORMAT;
+
+ // Read the version
+ Q_INT32 version;
+ s >> version;
+ if ( version < 100 )
+ return XXX_BAD_FILE_TOO_OLD;
+ if ( version > 123 )
+ return XXX_BAD_FILE_TOO_NEW;
+ if ( version <= 110 )
+ s.setVersion(1);
+
+ // Read the data
+ s >> [lots of interesting data];
+ if ( version > 120 )
+ s >> [data new in XXX version 1.2];
+ s >> [other interesting data];
+ \endcode
+
+ \sa QTextStream QVariant
+*/
+
+
+/*****************************************************************************
+ QDataStream member functions
+ *****************************************************************************/
+
+#if defined(CHECK_STATE)
+#undef CHECK_STREAM_PRECOND
+#define CHECK_STREAM_PRECOND if ( !dev ) { \
+ qWarning( "QDataStream: No device" ); \
+ return *this; }
+#else
+#define CHECK_STREAM_PRECOND
+#endif
+
+static int systemWordSize = 0;
+static bool systemBigEndian;
+
+static const int DefaultStreamVersion = 3;
+// 3 is default in Qt 2.1
+// 2 is the Qt 2.0.x format
+// 1 is the Qt 1.x format
+
+/*!
+ Constructs a data stream that has no IO device.
+
+ \sa setDevice()
+*/
+
+QDataStream::QDataStream()
+{
+ if ( systemWordSize == 0 ) // get system features
+ qSysInfo( &systemWordSize, &systemBigEndian );
+ dev = 0; // no device set
+ owndev = FALSE;
+ byteorder = BigEndian; // default byte order
+ printable = FALSE;
+ ver = DefaultStreamVersion;
+ noswap = systemBigEndian;
+}
+
+/*!
+ Constructs a data stream that uses the IO device \a d.
+
+ \sa setDevice(), device()
+*/
+
+QDataStream::QDataStream( QIODevice *d )
+{
+ if ( systemWordSize == 0 ) // get system features
+ qSysInfo( &systemWordSize, &systemBigEndian );
+ dev = d; // set device
+ owndev = FALSE;
+ byteorder = BigEndian; // default byte order
+ printable = FALSE;
+ ver = DefaultStreamVersion;
+ noswap = systemBigEndian;
+}
+
+/*!
+ Constructs a data stream that operates on a byte array through an
+ internal QBuffer device.
+
+ Example:
+ \code
+ static char bindata[] = { 231, 1, 44, ... };
+ QByteArray a;
+ a.setRawData( bindata, sizeof(bindata) ); // a points to bindata
+ QDataStream s( a, IO_ReadOnly ); // open on a's data
+ s >> [something]; // read raw bindata
+ a.resetRawData( bindata, sizeof(bindata) ); // finished
+ \endcode
+
+ The QArray::setRawData() function is not for the inexperienced.
+*/
+
+QDataStream::QDataStream( QByteArray a, int mode )
+{
+ if ( systemWordSize == 0 ) // get system features
+ qSysInfo( &systemWordSize, &systemBigEndian );
+ dev = new QBuffer( a ); // create device
+ ((QBuffer *)dev)->open( mode ); // open device
+ owndev = TRUE;
+ byteorder = BigEndian; // default byte order
+ printable = FALSE;
+ ver = DefaultStreamVersion;
+ noswap = systemBigEndian;
+}
+
+/*!
+ Destructs the data stream.
+
+ The destructor will not affect the current IO device, unless it
+ is an internal IO device processing a QByteArray passed in the constructor.
+*/
+
+QDataStream::~QDataStream()
+{
+ if ( owndev )
+ delete dev;
+}
+
+
+/*!
+ \fn QIODevice *QDataStream::device() const
+ Returns the IO device currently set.
+ \sa setDevice(), unsetDevice()
+*/
+
+/*!
+ void QDataStream::setDevice(QIODevice *d )
+ Sets the IO device to \a d.
+ \sa device(), unsetDevice()
+*/
+
+void QDataStream::setDevice(QIODevice *d )
+{
+ if ( owndev ) {
+ delete dev;
+ owndev = FALSE;
+ }
+ dev = d;
+}
+
+/*!
+ Unsets the IO device. This is the same as calling setDevice( 0 ).
+ \sa device(), setDevice()
+*/
+
+void QDataStream::unsetDevice()
+{
+ setDevice( 0 );
+}
+
+
+/*!
+ \fn bool QDataStream::atEnd() const
+ Returns TRUE if the IO device has reached the end position (end of
+ stream or file) or if there is no IO device set.
+
+ Returns FALSE if the current position of the read/write head of the IO
+ device is somewhere before the end position.
+
+ \sa QIODevice::atEnd()
+*/
+
+/*!\fn bool QDataStream::eof() const
+
+ \obsolete
+
+ Returns TRUE if the IO device has reached the end position (end of
+ stream or file) or if there is no IO device set.
+
+ Returns FALSE if the current position of the read/write head of the IO
+ device is somewhere before the end position.
+
+ \sa QIODevice::atEnd()
+*/
+
+/*!
+ \fn int QDataStream::byteOrder() const
+ Returns the current byte order setting - either \c BigEndian or
+ \c LittleEndian.
+
+ \sa setByteOrder()
+*/
+
+/*!
+ Sets the serialization byte order to \a bo.
+
+ The \a bo parameter can be \c QDataStream::BigEndian or
+ \c QDataStream::LittleEndian.
+
+ The default setting is big endian. We recommend leaving this setting unless
+ you have special requirements.
+
+ \sa byteOrder()
+*/
+
+void QDataStream::setByteOrder( int bo )
+{
+ byteorder = bo;
+ if ( systemBigEndian )
+ noswap = byteorder == BigEndian;
+ else
+ noswap = byteorder == LittleEndian;
+}
+
+
+/*!
+ \fn bool QDataStream::isPrintableData() const
+ Returns TRUE if the printable data flag has been set.
+ \sa setPrintableData()
+*/
+
+/*!
+ \fn void QDataStream::setPrintableData( bool enable )
+ Sets or clears the printable data flag.
+
+ If this flag is set, the write functions will generate output that
+ consists of printable characters (7 bit ASCII).
+
+ We recommend enabling printable data only for debugging purposes
+ (it is slower and creates larger output).
+*/
+
+
+/*!
+ \fn int QDataStream::version() const
+ Returns the version number of the data serialization format.
+ In Qt 2.1, this number is by default 3.
+ \sa setVersion()
+*/
+
+/*!
+ \fn void QDataStream::setVersion( int v )
+ Sets the version number of the data serialization format.
+
+ In order to accomodate for 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 of QDataStream.
+
+ For Qt 1.x compatibility, use \a v == 1.
+
+ For Qt 2.0.x compatibility, use \a v == 2 (Not required for reading in
+ Qt 2.1).
+
+ \sa version()
+*/
+
+/*****************************************************************************
+ QDataStream read functions
+ *****************************************************************************/
+
+
+static Q_INT32 read_int_ascii( QDataStream *s )
+{
+ register int n = 0;
+ char buf[40];
+ while ( TRUE ) {
+ buf[n] = s->device()->getch();
+ if ( buf[n] == '\n' || n > 38 ) // $-terminator
+ break;
+ n++;
+ }
+ buf[n] = '\0';
+ return atol( buf );
+}
+
+
+/*!
+ \fn QDataStream &QDataStream::operator>>( Q_UINT8 &i )
+ Reads an unsigned byte from the stream and returns a reference to
+ the stream.
+*/
+
+/*!
+ Reads a signed byte from the stream.
+*/
+
+QDataStream &QDataStream::operator>>( Q_INT8 &i )
+{
+ CHECK_STREAM_PRECOND
+ if ( printable ) { // printable data
+ i = (Q_INT8)dev->getch();
+ if ( i == '\\' ) { // read octal code
+ char buf[4];
+ dev->readBlock( buf, 3 );
+ i = (buf[2] & 0x07)+((buf[1] & 0x07) << 3)+((buf[0] & 0x07) << 6);
+ }
+ } else { // data or text
+ i = (Q_INT8)dev->getch();
+ }
+ return *this;
+}
+
+
+/*!
+ \fn QDataStream &QDataStream::operator>>( Q_UINT16 &i )
+ Reads an unsigned 16-bit integer from the stream and returns a reference to
+ the stream.
+*/
+
+/*!
+ Reads a signed 16-bit integer from the stream and returns a reference to
+ the stream.
+*/
+
+QDataStream &QDataStream::operator>>( Q_INT16 &i )
+{
+ CHECK_STREAM_PRECOND
+ if ( printable ) { // printable data
+ i = (Q_INT16)read_int_ascii( this );
+ } else if ( noswap ) { // no conversion needed
+ dev->readBlock( (char *)&i, sizeof(Q_INT16) );
+ } else { // swap bytes
+ register uchar *p = (uchar *)(&i);
+ char b[2];
+ dev->readBlock( b, 2 );
+ *p++ = b[1];
+ *p = b[0];
+ }
+ return *this;
+}
+
+
+/*!
+ \fn QDataStream &QDataStream::operator>>( Q_UINT32 &i )
+ Reads an unsigned 32-bit integer from the stream and returns a reference to
+ the stream.
+*/
+
+/*!
+ Reads a signed 32-bit integer from the stream and returns a reference to
+ the stream.
+*/
+
+QDataStream &QDataStream::operator>>( Q_INT32 &i )
+{
+ CHECK_STREAM_PRECOND
+ if ( printable ) { // printable data
+ i = read_int_ascii( this );
+ } else if ( noswap ) { // no conversion needed
+ dev->readBlock( (char *)&i, sizeof(Q_INT32) );
+ } else { // swap bytes
+ register uchar *p = (uchar *)(&i);
+ char b[4];
+ dev->readBlock( b, 4 );
+ *p++ = b[3];
+ *p++ = b[2];
+ *p++ = b[1];
+ *p = b[0];
+ }
+ return *this;
+}
+
+/*!
+ \fn QDataStream &QDataStream::operator>>( Q_UINT64 &i )
+ Reads an unsigned 64-bit integer from the stream and returns a reference to
+ the stream, or uses the Q_UINT32 operator if 64 bit is not available.
+*/
+
+/*!
+ Reads a signed 64-bit integer from the stream and returns a reference to
+ the stream, or uses the Q_UINT32 operator if 64 bit is not available.
+*/
+
+QDataStream &QDataStream::operator>>( Q_INT64 &i )
+{
+ CHECK_STREAM_PRECOND
+ if ( printable ) { // printable data
+ i = read_int_ascii( this );
+ } else if ( noswap ) { // no conversion needed
+ dev->readBlock( (char *)&i, sizeof(Q_INT64) );
+ } else { // swap bytes
+ register uchar *p = (uchar *)(&i);
+ char b[sizeof(Q_INT64)];
+ dev->readBlock( b, sizeof(Q_INT64) );
+ if ( sizeof(Q_INT64) == 8 ) {
+ *p++ = b[7];
+ *p++ = b[6];
+ *p++ = b[5];
+ *p++ = b[4];
+ }
+ *p++ = b[3];
+ *p++ = b[2];
+ *p++ = b[1];
+ *p = b[0];
+ }
+ return *this;
+}
+
+static double read_double_ascii( QDataStream *s )
+{
+ register int n = 0;
+ char buf[80];
+ while ( TRUE ) {
+ buf[n] = s->device()->getch();
+ if ( buf[n] == '\n' || n > 78 ) // $-terminator
+ break;
+ n++;
+ }
+ buf[n] = '\0';
+ return atof( buf );
+}
+
+
+/*!
+ Reads a 32-bit floating point number from the stream using the standard
+ IEEE754 format. Returns a reference to the stream.
+*/
+
+QDataStream &QDataStream::operator>>( float &f )
+{
+ CHECK_STREAM_PRECOND
+ if ( printable ) { // printable data
+ f = (float)read_double_ascii( this );
+ } else if ( noswap ) { // no conversion needed
+ dev->readBlock( (char *)&f, sizeof(float) );
+ } else { // swap bytes
+ register uchar *p = (uchar *)(&f);
+ char b[4];
+ dev->readBlock( b, 4 );
+ *p++ = b[3];
+ *p++ = b[2];
+ *p++ = b[1];
+ *p = b[0];
+ }
+ return *this;
+}
+
+
+/*!
+ Reads a 64-bit floating point number from the stream using the standard
+ IEEE754 format. Returns a reference to the stream.
+*/
+
+QDataStream &QDataStream::operator>>( double &f )
+{
+ CHECK_STREAM_PRECOND
+ if ( printable ) { // printable data
+ f = read_double_ascii( this );
+ } else if ( noswap ) { // no conversion needed
+ dev->readBlock( (char *)&f, sizeof(double) );
+ } else { // swap bytes
+ register uchar *p = (uchar *)(&f);
+ char b[8];
+ dev->readBlock( b, 8 );
+ *p++ = b[7];
+ *p++ = b[6];
+ *p++ = b[5];
+ *p++ = b[4];
+ *p++ = b[3];
+ *p++ = b[2];
+ *p++ = b[1];
+ *p = b[0];
+ }
+ return *this;
+}
+
+
+/*!
+ 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
+ eventually call delete[] on the value.
+*/
+
+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. If the length is zero or \a s cannot be allocated, \a s is
+ set to 0.
+
+ The \a l parameter will be set to the length of the buffer.
+
+ The serialization format is an Q_UINT32 length specifier first, then the
+ data (\a l bytes).
+
+ \sa readRawBytes(), writeBytes()
+*/
+
+QDataStream &QDataStream::readBytes( char *&s, uint &l )
+{
+ CHECK_STREAM_PRECOND
+ Q_UINT32 len;
+ *this >> len; // first read length spec
+ l = (uint)len;
+ if ( len == 0 || eof() ) {
+ s = 0;
+ return *this;
+ } else {
+ s = new char[len]; // create char array
+ CHECK_PTR( s );
+ if ( !s ) // no memory
+ return *this;
+ return readRawBytes( s, (uint)len );
+ }
+}
+
+
+/*!
+ Reads \a len bytes from the stream into \a s and returns a reference to
+ the stream.
+
+ The buffer \a s must be preallocated.
+
+ \sa readBytes(), QIODevice::readBlock(), writeRawBytes()
+*/
+
+QDataStream &QDataStream::readRawBytes( char *s, uint len )
+{
+ CHECK_STREAM_PRECOND
+ if ( printable ) { // printable data
+ register Q_INT8 *p = (Q_INT8*)s;
+ while ( len-- )
+ *this >> *p++;
+ } else { // read data char array
+ dev->readBlock( s, len );
+ }
+ return *this;
+}
+
+
+/*****************************************************************************
+ QDataStream write functions
+ *****************************************************************************/
+
+
+/*!
+ \fn QDataStream &QDataStream::operator<<( Q_UINT8 i )
+ Writes an unsigned byte to the stream and returns a reference to
+ the stream.
+*/
+
+/*!
+ Writes a signed byte to the stream.
+*/
+
+QDataStream &QDataStream::operator<<( Q_INT8 i )
+{
+ CHECK_STREAM_PRECOND
+ if ( printable && (i == '\\' || !isprint(i)) ) {
+ char buf[6]; // write octal code
+ buf[0] = '\\';
+ buf[1] = '0' + ((i >> 6) & 0x07);
+ buf[2] = '0' + ((i >> 3) & 0x07);
+ buf[3] = '0' + (i & 0x07);
+ buf[4] = '\0';
+ dev->writeBlock( buf, 4 );
+ } else {
+ dev->putch( i );
+ }
+ return *this;
+}
+
+
+/*!
+ \fn QDataStream &QDataStream::operator<<( Q_UINT16 i )
+ Writes an unsigned 16-bit integer to the stream and returns a reference
+ to the stream.
+*/
+
+/*!
+ Writes a signed 16-bit integer to the stream and returns a reference to
+ the stream.
+*/
+
+QDataStream &QDataStream::operator<<( Q_INT16 i )
+{
+ CHECK_STREAM_PRECOND
+ if ( printable ) { // printable data
+ char buf[16];
+ sprintf( buf, "%d\n", i );
+ dev->writeBlock( buf, strlen(buf) );
+ } else if ( noswap ) { // no conversion needed
+ dev->writeBlock( (char *)&i, sizeof(Q_INT16) );
+ } else { // swap bytes
+ register uchar *p = (uchar *)(&i);
+ char b[2];
+ b[1] = *p++;
+ b[0] = *p;
+ dev->writeBlock( b, 2 );
+ }
+ return *this;
+}
+
+
+/*!
+ \fn QDataStream &QDataStream::operator<<( Q_UINT32 i )
+ Writes an unsigned 32-bit integer to the stream and returns a reference to
+ the stream.
+*/
+
+/*!
+ Writes a signed 32-bit integer to the stream and returns a reference to
+ the stream.
+*/
+
+QDataStream &QDataStream::operator<<( Q_INT32 i )
+{
+ CHECK_STREAM_PRECOND
+ if ( printable ) { // printable data
+ char buf[16];
+ sprintf( buf, "%d\n", i );
+ dev->writeBlock( buf, strlen(buf) );
+ } else if ( noswap ) { // no conversion needed
+ dev->writeBlock( (char *)&i, sizeof(Q_INT32) );
+ } else { // swap bytes
+ register uchar *p = (uchar *)(&i);
+ char b[4];
+ b[3] = *p++;
+ b[2] = *p++;
+ b[1] = *p++;
+ b[0] = *p;
+ dev->writeBlock( b, 4 );
+ }
+ return *this;
+}
+
+/*!
+ \fn QDataStream &QDataStream::operator<<( Q_UINT64 i )
+ Writes an unsigned 64-bit integer to the stream and returns a reference to
+ the stream, or uses the Q_UINT32-operator if 64 bit is not available.
+*/
+
+/*!
+ Writes a signed 64-bit integer to the stream and returns a reference to
+ the stream, or calls the Q_INT32-operator if 64 bit is not available.
+*/
+
+QDataStream &QDataStream::operator<<( Q_INT64 i )
+{
+ CHECK_STREAM_PRECOND
+ if ( printable ) { // printable data
+ char buf[20];
+ sprintf( buf, "%ld\n", i );
+ dev->writeBlock( buf, strlen(buf) );
+ } else if ( noswap ) { // no conversion needed
+ dev->writeBlock( (char *)&i, sizeof(Q_INT64) );
+ } else { // swap bytes
+ register uchar *p = (uchar *)(&i);
+ char b[sizeof(Q_INT64)];
+ if ( sizeof(Q_INT64) == 8 ) {
+ b[7] = *p++;
+ b[6] = *p++;
+ b[5] = *p++;
+ b[4] = *p++;
+ }
+ b[3] = *p++;
+ b[2] = *p++;
+ b[1] = *p++;
+ b[0] = *p;
+ dev->writeBlock( b, sizeof(Q_INT64) );
+ }
+ return *this;
+}
+
+/*!
+ \fn QDataStream &QDataStream::operator<<( uint i )
+ Writes an unsigned integer to the stream as a 32-bit unsigned integer
+ (Q_UINT32).
+ Returns a reference to the stream.
+*/
+
+/*!
+ \fn QDataStream &QDataStream::operator<<( int i )
+ Writes a signed integer to the stream as a 32-bit signed integer (Q_INT32).
+ Returns a reference to the stream.
+*/
+
+
+/*!
+ Writes a 32-bit floating point number to the stream using the standard
+ IEEE754 format. Returns a reference to the stream.
+*/
+
+QDataStream &QDataStream::operator<<( float f )
+{
+ CHECK_STREAM_PRECOND
+ if ( printable ) { // printable data
+ char buf[32];
+ sprintf( buf, "%g\n", (double)f );
+ dev->writeBlock( buf, strlen(buf) );
+ } else {
+ float g = f; // fixes float-on-stack problem
+ if ( noswap ) { // no conversion needed
+ dev->writeBlock( (char *)&g, sizeof(float) );
+ } else { // swap bytes
+ register uchar *p = (uchar *)(&g);
+ char b[4];
+ b[3] = *p++;
+ b[2] = *p++;
+ b[1] = *p++;
+ b[0] = *p;
+ dev->writeBlock( b, 4 );
+ }
+ }
+ return *this;
+}
+
+
+/*!
+ Writes a 64-bit floating point number to the stream using the standard
+ IEEE754 format. Returns a reference to the stream.
+*/
+
+QDataStream &QDataStream::operator<<( double f )
+{
+ CHECK_STREAM_PRECOND
+ if ( printable ) { // printable data
+ char buf[32];
+ sprintf( buf, "%g\n", f );
+ dev->writeBlock( buf, strlen(buf) );
+ } else if ( noswap ) { // no conversion needed
+ dev->writeBlock( (char *)&f, sizeof(double) );
+ } else { // swap bytes
+ register uchar *p = (uchar *)(&f);
+ char b[8];
+ b[7] = *p++;
+ b[6] = *p++;
+ b[5] = *p++;
+ b[4] = *p++;
+ b[3] = *p++;
+ b[2] = *p++;
+ b[1] = *p++;
+ b[0] = *p;
+ dev->writeBlock( b, 8 );
+ }
+ return *this;
+}
+
+
+/*!
+ 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 << (Q_UINT32)0;
+ return *this;
+ }
+ uint len = qstrlen( s ) + 1; // also write null terminator
+ *this << (Q_UINT32)len; // write length specifier
+ return writeRawBytes( s, len );
+}
+
+
+/*!
+ 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 an Q_UINT32, followed by \a len bytes from
+ \a s.
+
+ \sa writeRawBytes(), readBytes()
+*/
+
+QDataStream &QDataStream::writeBytes(const char *s, uint len)
+{
+ CHECK_STREAM_PRECOND
+ *this << (Q_UINT32)len; // write length specifier
+ if ( len )
+ writeRawBytes( s, len );
+ return *this;
+}
+
+
+/*!
+ Writes \a len bytes from \a s to the stream and returns a reference to the
+ stream.
+
+ \sa writeBytes(), QIODevice::writeBlock(), readRawBytes()
+*/
+
+QDataStream &QDataStream::writeRawBytes( const char *s, uint len )
+{
+ CHECK_STREAM_PRECOND
+ if ( printable ) { // write printable
+ register char *p = (char *)s;
+ while ( len-- )
+ *this << *p++;
+ } else { // write data char array
+ dev->writeBlock( s, len );
+ }
+ return *this;
+}
+
+#endif // QT_NO_DATASTREAM
generated by cgit v0.12 at 2024-11-16 02:58:31 (GMT)