/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtAddOn.JsonStream module of the Qt.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia.  For licensing terms and
** conditions see http://qt.digia.com/licensing.  For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** 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, Digia gives you certain additional
** rights.  These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef _JSON_BUFFER_H
#define _JSON_BUFFER_H

#include <QObject>
#include <QByteArray>
#include <QJsonObject>
#include <QMutex>

#include "qjsonstream-global.h"

class QMutexLocker;

QT_BEGIN_NAMESPACE_JSONSTREAM

class Q_ADDON_JSONSTREAM_EXPORT QJsonBuffer : public QObject
{
    Q_OBJECT
public:
    QJsonBuffer(QObject *parent=0);
    void append(const QByteArray& data);
    void append(const char* data, int len);
    int  copyFromFd(int fd);
    void clear();

    EncodingFormat  format() const;

    bool messageAvailable();
    QJsonObject readMessage();

    int size() const { return mBuffer.size(); }

    inline bool isEnabled() const { return mEnabled; }
    inline void setEnabled(bool enable) { mEnabled = enable; }

    inline void setThreadProtection(bool enable) { mThreadProtection = enable; }

signals:
    void readyReadMessage();

protected:
    QMutexLocker *createLocker();

private:
    void processMessages();
    bool scanUtf(int c);
    void resetParser();
    QByteArray rawData(int _start, int _len) const;

private:
    enum UTF8ParsingState { ParseNormal, ParseInString, ParseInBackslash };

    EncodingFormat   mFormat;
    QByteArray       mBuffer;
    UTF8ParsingState mParserState;
    int              mParserDepth;
    int              mParserOffset;
    int              mParserStartOffset;
    bool             mEmittedReadyRead;
    bool             mMessageAvailable;
    int              mMessageSize;
    bool             mEnabled;
    bool             mThreadProtection;
    QMutex           mMutex;
};

inline QByteArray QJsonBuffer::rawData(int _start, int _len) const
{
    return QByteArray::fromRawData(mBuffer.constData() + _start, _len);
}

QT_END_NAMESPACE_JSONSTREAM

#endif  // _JSON_BUFFER_H