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Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12

1 files changed, 220 insertions, 0 deletions

diff --git a/src/corelib/tools/qbytedata_p.h b/src/corelib/tools/qbytedata_p.h
new file mode 100644
index 0000000000..45c576d2e9
--- /dev/null
+++ b/src/corelib/tools/qbytedata_p.h
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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.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QBYTEDATA_H
+#define QBYTEDATA_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <qbytearray.h>
+
+QT_BEGIN_NAMESPACE
+
+// this class handles a list of QByteArrays. It is a variant of QRingBuffer
+// that avoid malloc/realloc/memcpy.
+class QByteDataBuffer
+{
+private:
+    QList<QByteArray> buffers;
+    qint64 bufferCompleteSize;
+public:
+    QByteDataBuffer() : bufferCompleteSize(0)
+    {
+    }
+
+    ~QByteDataBuffer()
+    {
+        clear();
+    }
+
+    inline void append(QByteDataBuffer& other)
+    {
+        if (other.isEmpty())
+            return;
+
+        buffers.append(other.buffers);
+        bufferCompleteSize += other.byteAmount();
+    }
+
+
+    inline void append(const QByteArray& bd)
+    {
+        if (bd.isEmpty())
+            return;
+
+        buffers.append(bd);
+        bufferCompleteSize += bd.size();
+    }
+
+    inline void prepend(QByteArray& bd)
+    {
+        if (bd.isEmpty())
+            return;
+
+        buffers.prepend(bd);
+        bufferCompleteSize += bd.size();
+    }
+
+    // return the first QByteData. User of this function has to qFree() its .data!
+    // preferably use this function to read data.
+    inline QByteArray read()
+    {
+        bufferCompleteSize -= buffers.first().size();
+        return buffers.takeFirst();
+    }
+
+    // return everything. User of this function has to qFree() its .data!
+    // avoid to use this, it might malloc and memcpy.
+    inline QByteArray readAll()
+    {
+        return read(byteAmount());
+    }
+
+    // return amount. User of this function has to qFree() its .data!
+    // avoid to use this, it might malloc and memcpy.
+    inline QByteArray read(qint64 amount)
+    {
+        amount = qMin(byteAmount(), amount);
+        QByteArray byteData;
+        byteData.resize(amount);
+        read(byteData.data(), byteData.size());
+        return byteData;
+    }
+
+    // return amount bytes. User of this function has to qFree() its .data!
+    // avoid to use this, it will memcpy.
+    qint64 read(char* dst, qint64 amount)
+    {
+        amount = qMin(amount, byteAmount());
+        qint64 originalAmount = amount;
+        char *writeDst = dst;
+
+        while (amount > 0) {
+            QByteArray first = buffers.takeFirst();
+            if (amount >= first.size()) {
+                // take it completely
+                bufferCompleteSize -= first.size();
+                amount -= first.size();
+                memcpy(writeDst, first.constData(), first.size());
+                writeDst += first.size();
+                first.clear();
+            } else {
+                // take a part of it & it is the last one to take
+                bufferCompleteSize -= amount;
+                memcpy(writeDst, first.constData(), amount);
+
+                qint64 newFirstSize = first.size() - amount;
+                QByteArray newFirstData;
+                newFirstData.resize(newFirstSize);
+                memcpy(newFirstData.data(), first.constData() + amount, newFirstSize);
+                buffers.prepend(newFirstData);
+
+                amount = 0;
+                first.clear();
+            }
+        }
+
+        return originalAmount;
+    }
+
+    inline char getChar()
+    {
+        char c;
+        read(&c, 1);
+        return c;
+    }
+
+    inline void clear()
+    {
+        buffers.clear();
+        bufferCompleteSize = 0;
+    }
+
+    // The byte count of all QByteArrays
+    inline qint64 byteAmount() const
+    {
+        return bufferCompleteSize;
+    }
+
+    // the number of QByteArrays
+    inline qint64 bufferCount() const
+    {
+        return buffers.length();
+    }
+
+    inline bool isEmpty() const
+    {
+        return byteAmount() == 0;
+    }
+
+    inline qint64 sizeNextBlock() const
+    {
+        if(buffers.isEmpty())
+            return 0;
+        else
+            return buffers.first().size();
+    }
+
+    inline QByteArray& operator[](int i)
+    {
+        return buffers[i];
+    }
+
+    inline bool canReadLine() const {
+        for (int i = 0; i < buffers.length(); i++)
+            if (buffers.at(i).contains('\n'))
+                return true;
+        return false;
+    }
+};
+
+QT_END_NAMESPACE
+
+#endif // QBYTEDATA_H