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/* $Id: DataStreamImpl.h $ */
/** @file
* VirtualBox COM class implementation
*/
/*
* Copyright (C) 2018-2022 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* 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, in 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 <https://www.gnu.org/licenses>.
*
* SPDX-License-Identifier: GPL-3.0-only
*/
#ifndef MAIN_INCLUDED_DataStreamImpl_h
#define MAIN_INCLUDED_DataStreamImpl_h
#ifndef RT_WITHOUT_PRAGMA_ONCE
# pragma once
#endif
#include "DataStreamWrap.h"
#include <iprt/circbuf.h>
#include <iprt/semaphore.h>
class ATL_NO_VTABLE DataStream
: public DataStreamWrap
{
public:
DECLARE_COMMON_CLASS_METHODS(DataStream)
HRESULT FinalConstruct();
void FinalRelease();
HRESULT init(unsigned long aBufferSize);
void uninit();
/// Feed data into the stream, used by the stream source.
/// Blocks if the internal buffer cannot take anything, otherwise
/// as much as the internal buffer can hold is taken (if smaller
/// than @a cbWrite). Modeled after RTStrmWriteEx.
int i_write(const void *pvBuf, size_t cbWrite, size_t *pcbWritten);
/// Marks the end of the stream.
int i_close();
private:
// wrapped IDataStream attributes and methods
HRESULT getReadSize(ULONG *aReadSize);
HRESULT read(ULONG aSize, ULONG aTimeoutMS, std::vector<BYTE> &aData);
private:
/** The temporary buffer the conversion process writes into and the user reads from. */
PRTCIRCBUF m_pBuffer;
/** Event semaphore for waiting until data is available. */
RTSEMEVENT m_hSemEvtDataAvail;
/** Event semaphore for waiting until there is room in the buffer for writing. */
RTSEMEVENT m_hSemEvtBufSpcAvail;
/** Flag whether the end of stream flag is set. */
bool m_fEos;
};
#endif /* !MAIN_INCLUDED_DataStreamImpl_h */
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