| 1 | /* $Id: DataStreamImpl.h 82968 2020-02-04 10:35:17Z vboxsync $ */
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| 2 | /** @file
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| 3 | * VirtualBox COM class implementation
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2018-2020 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | */
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| 17 |
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| 18 | #ifndef MAIN_INCLUDED_DataStreamImpl_h
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| 19 | #define MAIN_INCLUDED_DataStreamImpl_h
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| 20 | #ifndef RT_WITHOUT_PRAGMA_ONCE
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| 21 | # pragma once
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| 22 | #endif
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| 23 |
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| 24 | #include "DataStreamWrap.h"
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| 25 |
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| 26 | #include <iprt/circbuf.h>
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| 27 | #include <iprt/semaphore.h>
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| 28 |
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| 29 | class ATL_NO_VTABLE DataStream
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| 30 | : public DataStreamWrap
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| 31 | {
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| 32 | public:
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| 33 | DECLARE_EMPTY_CTOR_DTOR(DataStream)
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| 34 |
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| 35 | HRESULT FinalConstruct();
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| 36 | void FinalRelease();
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| 37 |
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| 38 | HRESULT init(unsigned long aBufferSize);
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| 39 | void uninit();
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| 40 |
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| 41 | /// Feed data into the stream, used by the stream source.
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| 42 | /// Blocks if the internal buffer cannot take anything, otherwise
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| 43 | /// as much as the internal buffer can hold is taken (if smaller
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| 44 | /// than @a cbWrite). Modeled after RTStrmWriteEx.
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| 45 | int i_write(const void *pvBuf, size_t cbWrite, size_t *pcbWritten);
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| 46 |
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| 47 | /// Marks the end of the stream.
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| 48 | int i_close();
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| 49 |
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| 50 | private:
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| 51 | // wrapped IDataStream attributes and methods
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| 52 | HRESULT getReadSize(ULONG *aReadSize);
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| 53 | HRESULT read(ULONG aSize, ULONG aTimeoutMS, std::vector<BYTE> &aData);
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| 54 |
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| 55 | private:
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| 56 | /** The temporary buffer the conversion process writes into and the user reads from. */
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| 57 | PRTCIRCBUF m_pBuffer;
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| 58 | /** Event semaphore for waiting until data is available. */
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| 59 | RTSEMEVENT m_hSemEvtDataAvail;
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| 60 | /** Event semaphore for waiting until there is room in the buffer for writing. */
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| 61 | RTSEMEVENT m_hSemEvtBufSpcAvail;
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| 62 | /** Flag whether the end of stream flag is set. */
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| 63 | bool m_fEos;
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| 64 | };
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| 65 |
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| 66 | #endif /* !MAIN_INCLUDED_DataStreamImpl_h */
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| 67 |
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| 68 | /* vi: set tabstop=4 shiftwidth=4 expandtab: */
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