You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
499 lines
13 KiB
499 lines
13 KiB
/****************************************************************************
|
|
**
|
|
** Implementation of TQBuffer class
|
|
**
|
|
** Created : 930812
|
|
**
|
|
** Copyright (C) 1992-2008 Trolltech ASA. All rights reserved.
|
|
**
|
|
** This file is part of the tools module of the TQt GUI Toolkit.
|
|
**
|
|
** This file may be used under the terms of the GNU General
|
|
** Public License versions 2.0 or 3.0 as published by the Free
|
|
** Software Foundation and appearing in the files LICENSE.GPL2
|
|
** and LICENSE.GPL3 included in the packaging of this file.
|
|
** Alternatively you may (at your option) use any later version
|
|
** of the GNU General Public License if such license has been
|
|
** publicly approved by Trolltech ASA (or its successors, if any)
|
|
** and the KDE Free TQt Foundation.
|
|
**
|
|
** Please review the following information to ensure GNU General
|
|
** Public Licensing requirements will be met:
|
|
** http://trolltech.com/products/qt/licenses/licensing/opensource/.
|
|
** If you are unsure which license is appropriate for your use, please
|
|
** review the following information:
|
|
** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
|
|
** or contact the sales department at sales@trolltech.com.
|
|
**
|
|
** This file may be used under the terms of the Q Public License as
|
|
** defined by Trolltech ASA and appearing in the file LICENSE.TQPL
|
|
** included in the packaging of this file. Licensees holding valid TQt
|
|
** Commercial licenses may use this file in accordance with the TQt
|
|
** Commercial License Agreement provided with the Software.
|
|
**
|
|
** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
|
|
** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
|
|
** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted
|
|
** herein.
|
|
**
|
|
**********************************************************************/
|
|
|
|
#include "ntqbuffer.h"
|
|
#include <stdlib.h>
|
|
|
|
/*!
|
|
\class TQBuffer ntqbuffer.h
|
|
\reentrant
|
|
\brief The TQBuffer class is an I/O device that operates on a TQByteArray.
|
|
|
|
\ingroup io
|
|
\ingroup collection
|
|
|
|
TQBuffer is used to read and write to a memory buffer. It is
|
|
normally used with a TQTextStream or a TQDataStream. TQBuffer has an
|
|
associated TQByteArray which holds the buffer data. The size() of
|
|
the buffer is automatically adjusted as data is written.
|
|
|
|
The constructor \c TQBuffer(TQByteArray) creates a TQBuffer using an
|
|
existing byte array. The byte array can also be set with
|
|
setBuffer(). Writing to the TQBuffer will modify the original byte
|
|
array because TQByteArray is \link shclass.html explicitly
|
|
shared.\endlink
|
|
|
|
Use open() to open the buffer before use and to set the mode
|
|
(read-only, write-only, etc.). close() closes the buffer. The
|
|
buffer must be closed before reopening or calling setBuffer().
|
|
|
|
A common way to use TQBuffer is through \l TQDataStream or \l
|
|
TQTextStream, which have constructors that take a TQBuffer
|
|
parameter. For convenience, there are also TQDataStream and
|
|
TQTextStream constructors that take a TQByteArray parameter. These
|
|
constructors create and open an internal TQBuffer.
|
|
|
|
Note that TQTextStream can also operate on a TQString (a Unicode
|
|
string); a TQBuffer cannot.
|
|
|
|
You can also use TQBuffer directly through the standard TQIODevice
|
|
functions readBlock(), writeBlock() readLine(), at(), getch(),
|
|
putch() and ungetch().
|
|
|
|
\sa TQFile, TQDataStream, TQTextStream, TQByteArray, \link shclass.html Shared Classes\endlink
|
|
*/
|
|
|
|
|
|
/*!
|
|
Constructs an empty buffer.
|
|
*/
|
|
|
|
TQBuffer::TQBuffer()
|
|
{
|
|
setFlags( IO_Direct );
|
|
a_inc = 16; // initial increment
|
|
a_len = 0;
|
|
ioIndex = 0;
|
|
}
|
|
|
|
|
|
/*!
|
|
Constructs a buffer that operates on \a buf.
|
|
|
|
If you open the buffer in write mode (\c IO_WriteOnly or
|
|
\c IO_ReadWrite) and write something into the buffer, \a buf
|
|
will be modified.
|
|
|
|
Example:
|
|
\code
|
|
TQCString str = "abc";
|
|
TQBuffer b( str );
|
|
b.open( IO_WriteOnly );
|
|
b.at( 3 ); // position at the 4th character (the terminating \0)
|
|
b.writeBlock( "def", 4 ); // write "def" including the terminating \0
|
|
b.close();
|
|
// Now, str == "abcdef" with a terminating \0
|
|
\endcode
|
|
|
|
\sa setBuffer()
|
|
*/
|
|
|
|
TQBuffer::TQBuffer( TQByteArray buf ) : a(buf)
|
|
{
|
|
setFlags( IO_Direct );
|
|
a_len = a.size();
|
|
a_inc = (a_len > 512) ? 512 : a_len; // initial increment
|
|
if ( a_inc < 16 )
|
|
a_inc = 16;
|
|
ioIndex = 0;
|
|
}
|
|
|
|
/*!
|
|
Destroys the buffer.
|
|
*/
|
|
|
|
TQBuffer::~TQBuffer()
|
|
{
|
|
}
|
|
|
|
|
|
/*!
|
|
Replaces the buffer's contents with \a buf and returns TRUE.
|
|
|
|
Does nothing (and returns FALSE) if isOpen() is TRUE.
|
|
|
|
Note that if you open the buffer in write mode (\c IO_WriteOnly or
|
|
IO_ReadWrite) and write something into the buffer, \a buf is also
|
|
modified because TQByteArray is an explicitly shared class.
|
|
|
|
\sa buffer(), open(), close()
|
|
*/
|
|
|
|
bool TQBuffer::setBuffer( TQByteArray buf )
|
|
{
|
|
if ( isOpen() ) {
|
|
#if defined(QT_CHECK_STATE)
|
|
tqWarning( "TQBuffer::setBuffer: Buffer is open" );
|
|
#endif
|
|
return FALSE;
|
|
}
|
|
a = buf;
|
|
a_len = a.size();
|
|
a_inc = (a_len > 512) ? 512 : a_len; // initial increment
|
|
if ( a_inc < 16 )
|
|
a_inc = 16;
|
|
ioIndex = 0;
|
|
return TRUE;
|
|
}
|
|
|
|
/*!
|
|
\fn TQByteArray TQBuffer::buffer() const
|
|
|
|
Returns this buffer's byte array.
|
|
|
|
\sa setBuffer()
|
|
*/
|
|
|
|
/*!
|
|
\reimp
|
|
|
|
Opens the buffer in mode \a m. Returns TRUE if successful;
|
|
otherwise returns FALSE. The buffer must be opened before use.
|
|
|
|
The mode parameter \a m must be a combination of the following flags.
|
|
\list
|
|
\i \c IO_ReadOnly opens the buffer in read-only mode.
|
|
\i \c IO_WriteOnly opens the buffer in write-only mode.
|
|
\i \c IO_ReadWrite opens the buffer in read/write mode.
|
|
\i \c IO_Append sets the buffer index to the end of the buffer.
|
|
\i \c IO_Truncate truncates the buffer.
|
|
\endlist
|
|
|
|
\sa close(), isOpen()
|
|
*/
|
|
|
|
bool TQBuffer::open( int m )
|
|
{
|
|
if ( isOpen() ) { // buffer already open
|
|
#if defined(QT_CHECK_STATE)
|
|
tqWarning( "TQBuffer::open: Buffer already open" );
|
|
#endif
|
|
return FALSE;
|
|
}
|
|
setMode( m );
|
|
if ( m & IO_Truncate ) { // truncate buffer
|
|
a.resize( 0 );
|
|
a_len = 0;
|
|
}
|
|
if ( m & IO_Append ) { // append to end of buffer
|
|
ioIndex = a.size();
|
|
} else {
|
|
ioIndex = 0;
|
|
}
|
|
a_inc = 16;
|
|
setState( IO_Open );
|
|
resetStatus();
|
|
return TRUE;
|
|
}
|
|
|
|
/*!
|
|
\reimp
|
|
|
|
Closes an open buffer.
|
|
|
|
\sa open()
|
|
*/
|
|
|
|
void TQBuffer::close()
|
|
{
|
|
if ( isOpen() ) {
|
|
setFlags( IO_Direct );
|
|
ioIndex = 0;
|
|
a_inc = 16;
|
|
}
|
|
}
|
|
|
|
/*!
|
|
\reimp
|
|
|
|
The flush function does nothing for a TQBuffer.
|
|
*/
|
|
|
|
void TQBuffer::flush()
|
|
{
|
|
return;
|
|
}
|
|
|
|
|
|
/*!
|
|
\fn TQIODevice::Offset TQBuffer::at() const
|
|
|
|
\reimp
|
|
*/
|
|
|
|
/*!
|
|
\fn TQIODevice::Offset TQBuffer::size() const
|
|
|
|
\reimp
|
|
*/
|
|
|
|
/*!
|
|
\reimp
|
|
*/
|
|
|
|
bool TQBuffer::at( Offset pos )
|
|
{
|
|
#if defined(QT_CHECK_STATE)
|
|
if ( !isOpen() ) {
|
|
tqWarning( "TQBuffer::at: Buffer is not open" );
|
|
return FALSE;
|
|
}
|
|
#endif
|
|
if ( pos > a_len ) {
|
|
#if defined(QT_CHECK_RANGE)
|
|
#if defined(QT_ABI_QT4)
|
|
tqWarning( "TQBuffer::at: Index %lld out of range", pos );
|
|
#else
|
|
tqWarning( "TQBuffer::at: Index %lu out of range", pos );
|
|
#endif
|
|
#endif
|
|
return FALSE;
|
|
}
|
|
ioIndex = pos;
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
/*!
|
|
\reimp
|
|
*/
|
|
|
|
TQ_LONG TQBuffer::readBlock( char *p, TQ_ULONG len )
|
|
{
|
|
#if defined(QT_CHECK_STATE)
|
|
if ( !p ) {
|
|
tqWarning( "TQBuffer::readBlock: Null pointer error" );
|
|
return -1;
|
|
}
|
|
if ( !isOpen() ) { // buffer not open
|
|
tqWarning( "TQBuffer::readBlock: Buffer not open" );
|
|
return -1;
|
|
}
|
|
if ( !isReadable() ) { // reading not permitted
|
|
tqWarning( "TQBuffer::readBlock: Read operation not permitted" );
|
|
return -1;
|
|
}
|
|
#endif
|
|
if ( ioIndex + len > a.size() ) { // overflow
|
|
if ( ioIndex >= a.size() ) {
|
|
return 0;
|
|
} else {
|
|
len = a.size() - ioIndex;
|
|
}
|
|
}
|
|
memcpy(p, a.data() + ioIndex, len);
|
|
ioIndex += len;
|
|
return len;
|
|
}
|
|
|
|
/*!
|
|
\overload TQ_LONG TQBuffer::writeBlock( const TQByteArray& data )
|
|
|
|
This convenience function is the same as calling
|
|
\c{writeBlock( data.data(), data.size() )} with \a data.
|
|
*/
|
|
|
|
/*!
|
|
Writes \a len bytes from \a p into the buffer at the current
|
|
index position, overwriting any characters there and extending the
|
|
buffer if necessary. Returns the number of bytes actually written.
|
|
|
|
Returns -1 if an error occurred.
|
|
|
|
\sa readBlock()
|
|
*/
|
|
|
|
TQ_LONG TQBuffer::writeBlock( const char *p, TQ_ULONG len )
|
|
{
|
|
if ( len == 0 )
|
|
return 0;
|
|
|
|
#if defined(QT_CHECK_NULL)
|
|
if ( p == 0 ) {
|
|
tqWarning( "TQBuffer::writeBlock: Null pointer error" );
|
|
return -1;
|
|
}
|
|
#endif
|
|
#if defined(QT_CHECK_STATE)
|
|
if ( !isOpen() ) { // buffer not open
|
|
tqWarning( "TQBuffer::writeBlock: Buffer not open" );
|
|
return -1;
|
|
}
|
|
if ( !isWritable() ) { // writing not permitted
|
|
tqWarning( "TQBuffer::writeBlock: Write operation not permitted" );
|
|
return -1;
|
|
}
|
|
#endif
|
|
if ( ioIndex + len > a_len ) { // overflow
|
|
TQ_ULONG new_len = a_len + a_inc*((ioIndex+len-a_len)/a_inc+1);
|
|
if ( !a.resize( new_len ) ) { // could not resize
|
|
#if defined(QT_CHECK_NULL)
|
|
tqWarning( "TQBuffer::writeBlock: Memory allocation error" );
|
|
#endif
|
|
setStatus( IO_ResourceError );
|
|
return -1;
|
|
}
|
|
a_inc *= 2; // double increment
|
|
a_len = new_len;
|
|
a.shd->len = ioIndex + len;
|
|
}
|
|
memcpy( a.data()+ioIndex, p, len );
|
|
ioIndex += len;
|
|
if ( a.shd->len < ioIndex )
|
|
a.shd->len = ioIndex; // fake (not alloc'd) length
|
|
return len;
|
|
}
|
|
|
|
|
|
/*!
|
|
\reimp
|
|
*/
|
|
|
|
TQ_LONG TQBuffer::readLine( char *p, TQ_ULONG maxlen )
|
|
{
|
|
#if defined(QT_CHECK_NULL)
|
|
if ( p == 0 ) {
|
|
tqWarning( "TQBuffer::readLine: Null pointer error" );
|
|
return -1;
|
|
}
|
|
#endif
|
|
#if defined(QT_CHECK_STATE)
|
|
if ( !isOpen() ) { // buffer not open
|
|
tqWarning( "TQBuffer::readLine: Buffer not open" );
|
|
return -1;
|
|
}
|
|
if ( !isReadable() ) { // reading not permitted
|
|
tqWarning( "TQBuffer::readLine: Read operation not permitted" );
|
|
return -1;
|
|
}
|
|
#endif
|
|
if ( maxlen == 0 )
|
|
return 0;
|
|
TQ_ULONG start = ioIndex;
|
|
char *d = a.data() + ioIndex;
|
|
maxlen--; // make room for 0-terminator
|
|
if ( a.size() - ioIndex < maxlen )
|
|
maxlen = a.size() - ioIndex;
|
|
while ( maxlen-- ) {
|
|
if ( (*p++ = *d++) == '\n' )
|
|
break;
|
|
}
|
|
*p = '\0';
|
|
ioIndex = d - a.data();
|
|
return ioIndex - start;
|
|
}
|
|
|
|
|
|
/*!
|
|
\reimp
|
|
*/
|
|
|
|
int TQBuffer::getch()
|
|
{
|
|
#if defined(QT_CHECK_STATE)
|
|
if ( !isOpen() ) { // buffer not open
|
|
tqWarning( "TQBuffer::getch: Buffer not open" );
|
|
return -1;
|
|
}
|
|
if ( !isReadable() ) { // reading not permitted
|
|
tqWarning( "TQBuffer::getch: Read operation not permitted" );
|
|
return -1;
|
|
}
|
|
#endif
|
|
if ( ioIndex+1 > a.size() ) { // overflow
|
|
setStatus( IO_ReadError );
|
|
return -1;
|
|
}
|
|
return uchar(*(a.data()+ioIndex++));
|
|
}
|
|
|
|
/*!
|
|
\reimp
|
|
|
|
Writes the character \a ch into the buffer at the current index
|
|
position, overwriting any existing character and extending the
|
|
buffer if necessary.
|
|
|
|
Returns \a ch, or -1 if an error occurred.
|
|
|
|
\sa getch(), ungetch()
|
|
*/
|
|
|
|
int TQBuffer::putch( int ch )
|
|
{
|
|
#if defined(QT_CHECK_STATE)
|
|
if ( !isOpen() ) { // buffer not open
|
|
tqWarning( "TQBuffer::putch: Buffer not open" );
|
|
return -1;
|
|
}
|
|
if ( !isWritable() ) { // writing not permitted
|
|
tqWarning( "TQBuffer::putch: Write operation not permitted" );
|
|
return -1;
|
|
}
|
|
#endif
|
|
if ( ioIndex + 1 > a_len ) { // overflow
|
|
char buf[1];
|
|
buf[0] = (char)ch;
|
|
if ( writeBlock(buf,1) != 1 )
|
|
return -1; // write error
|
|
} else {
|
|
*(a.data() + ioIndex++) = (char)ch;
|
|
if ( a.shd->len < ioIndex )
|
|
a.shd->len = ioIndex;
|
|
}
|
|
return ch;
|
|
}
|
|
|
|
/*!
|
|
\reimp
|
|
*/
|
|
|
|
int TQBuffer::ungetch( int ch )
|
|
{
|
|
#if defined(QT_CHECK_STATE)
|
|
if ( !isOpen() ) { // buffer not open
|
|
tqWarning( "TQBuffer::ungetch: Buffer not open" );
|
|
return -1;
|
|
}
|
|
if ( !isReadable() ) { // reading not permitted
|
|
tqWarning( "TQBuffer::ungetch: Read operation not permitted" );
|
|
return -1;
|
|
}
|
|
#endif
|
|
if ( ch != -1 ) {
|
|
if ( ioIndex )
|
|
ioIndex--;
|
|
else
|
|
ch = -1;
|
|
}
|
|
return ch;
|
|
}
|
|
|