scstreamfilter.h

/*
For general Scribus (>=1.3.2) copyright and licensing information please refer
to the COPYING file provided with the program. Following this notice may exist
a copyright and/or license notice that predates the release of Scribus 1.3.2
for which a new license (GPL+exception) is in place.
*/

#ifndef SCSTREAMFILTER_H
#define SCSTREAMFILTER_H

class QByteArray;
class QDataStream;

class ScStreamFilter
{
protected:

    typedef enum
    {
        FilterToStream = 0,
        FilterToFilter = 1
    } FilterMode;

    int             m_writtenToStream;
    FilterMode      m_filterMode;
    QDataStream*    m_dataStream;
    ScStreamFilter* m_filter;

    bool writeDataInternal(const char* data, int dataLen);

public:

    ScStreamFilter(QDataStream* stream);
    ScStreamFilter(ScStreamFilter* filter);
    virtual ~ScStreamFilter() {};

    virtual bool openFilter (void);
    virtual bool closeFilter(void);

    virtual bool writeData(const QByteArray& data);
    virtual bool writeData(const char* data, int dataLen) = 0;

    int writtenToStream(void);
};

class ScNullEncodeFilter : public ScStreamFilter
{
public:
    ScNullEncodeFilter(QDataStream* stream) : ScStreamFilter(stream) {};
    ScNullEncodeFilter(ScStreamFilter* filter) : ScStreamFilter(filter) {};

    virtual bool writeData(const char* data, int dataLen) { return writeDataInternal(data, dataLen); }
};

#endif