--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/qt3support/other/q3membuf.cpp	Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,171 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** 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