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/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
* Copyright 2011-2020 Pierre Ossman for Cendio AB
*
* This 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 of the License, or
* (at your option) any later version.
*
* This software 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 software; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
//
// Base class for output streams with a buffer
//
#ifndef __RDR_BUFFEREDOUTSTREAM_H__
#define __RDR_BUFFEREDOUTSTREAM_H__
#include <sys/time.h>
#include <rdr/OutStream.h>
namespace rdr {
class BufferedOutStream : public OutStream {
public:
virtual ~BufferedOutStream();
size_t length() override;
void flush() override;
// hasBufferedData() checks if there is any data yet to be flushed
bool hasBufferedData();
private:
// flushBuffer() requests that the stream be flushed. Returns true if it is
// able to progress the output (which might still not mean any bytes
// actually moved) and can be called again.
virtual bool flushBuffer() = 0;
void overrun(size_t needed) override;
private:
size_t bufSize;
size_t offset;
uint8_t* start;
struct timeval lastSizeCheck;
size_t peakUsage;
bool emulateCork;
protected:
uint8_t* sentUpTo;
protected:
BufferedOutStream(bool emulateCork=true);
};
}
#endif
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