/*
 *  Copyright (C) 2010 Felix Geyer <debfx@fobos.de>
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 2 or (at your option)
 *  version 3 of the License.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef KEEPASSX_SYMMETRICCIPHERSTREAM_H
#define KEEPASSX_SYMMETRICCIPHERSTREAM_H

#include <QByteArray>
#include <QScopedPointer>

#include "crypto/SymmetricCipher.h"
#include "streams/LayeredStream.h"

class SymmetricCipherStream : public LayeredStream
{
    Q_OBJECT

public:
    SymmetricCipherStream(QIODevice* baseDevice, SymmetricCipher::Algorithm algo,
                          SymmetricCipher::Mode mode, SymmetricCipher::Direction direction);
    ~SymmetricCipherStream();
    bool init(const QByteArray& key, const QByteArray& iv);
    bool open(QIODevice::OpenMode mode) override;
    bool reset() override;
    void close() override;

protected:
    qint64 readData(char* data, qint64 maxSize) override;
    qint64 writeData(const char* data, qint64 maxSize) override;

private:
    void resetInternalState();
    bool readBlock();
    bool writeBlock(bool lastBlock);
    int blockSize() const;

    const QScopedPointer<SymmetricCipher> m_cipher;
    QByteArray m_buffer;
    int m_bufferPos;
    bool m_bufferFilling;
    bool m_error;
    bool m_isInitialized;
    bool m_dataWritten;
    bool m_streamCipher;
};

#endif // KEEPASSX_SYMMETRICCIPHERSTREAM_H