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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the Qt3Support 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 "q3membuf_p.h"
QT_BEGIN_NAMESPACE
// *******************************************************************
// QMembuf declaration and implementation
// *******************************************************************
/* \internal
This class implements an efficient buffering of data that is often used by
asynchronous IO classes like QSocket, QHttp and QProcess.
*/
Q3Membuf::Q3Membuf() : _size(0), _index(0)
{
}
Q3Membuf::~Q3Membuf()
{
while (!buf.isEmpty())
delete buf.takeFirst();
}
/*! \internal
This function consumes \a nbytes bytes of data from the
buffer and copies it into \a sink. If \a sink is a 0 pointer
the data goes into the nirvana.
*/
bool Q3Membuf::consumeBytes(Q_ULONG nbytes, char *sink)
{
if (nbytes <= 0 || (qint64)nbytes > _size)
return false;
_size -= nbytes;
while (!buf.isEmpty()) {
QByteArray *a = buf.first();
if ((int)(_index + nbytes) >= a->size()) {
// Here we skip the whole byte array and get the next later
int len = a->size() - _index;
if (sink) {
memcpy(sink, a->constData()+_index, len);
sink += len;
}
nbytes -= len;
buf.removeFirst();
delete a;
_index = 0;
if (nbytes == 0)
break;
} else {
// Here we skip only a part of the first byte array
if (sink)
memcpy(sink, a->constData()+_index, nbytes);
_index += nbytes;
break;
}
}
return true;
}
/*! \internal
Scans for any occurrence of '\n' in the buffer. If \a store
is not 0 the text up to the first '\n' (or terminating 0) is
written to \a store, and a terminating 0 is appended to \a store
if necessary. Returns true if a '\n' was found; otherwise returns
false.
*/
bool Q3Membuf::scanNewline(QByteArray *store)
{
if (_size == 0)
return false;
int i = 0; // index into 'store'
QByteArray *a = 0;
char *p;
int n;
bool retval = false;
for (int j = 0; j < buf.size(); ++j) {
a = buf.at(j);
p = a->data();
n = a->size();
if (!j) {
// first buffer
p += _index;
n -= _index;
}
if (store) {
while (n-- > 0) {
*(store->data()+i) = *p;
if (++i == (int)store->size())
store->resize(store->size() < 256
? 1024 : store->size()*4);
if (*p == '\n') {
retval = true;
goto end;
}
p++;
}
} else {
while (n-- > 0) {
if(*p == '\n')
return true;
p++;
}
}
}
end:
if (store)
store->resize(i);
return retval;
}
int Q3Membuf::ungetch(int ch)
{
if (buf.isEmpty() || _index==0) {
// we need a new QByteArray
QByteArray *ba = new QByteArray;
ba->resize(1);
buf.prepend(ba);
_size++;
(*ba)[0] = ch;
} else {
// we can reuse a place in the buffer
QByteArray *ba = buf.first();
_index--;
_size++;
(*ba)[(int)_index] = ch;
}
return ch;
}
QT_END_NAMESPACE
|
