| 1 | /* $Id: DataStreamImpl.h 74776 2018-10-11 17:30:59Z vboxsync $ */
|
|---|
| 2 | /** @file
|
|---|
| 3 | * VirtualBox COM class implementation
|
|---|
| 4 | */
|
|---|
| 5 |
|
|---|
| 6 | /*
|
|---|
| 7 | * Copyright (C) 2018 Oracle Corporation
|
|---|
| 8 | *
|
|---|
| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
|
|---|
| 10 | * available from http://www.virtualbox.org. This file is free software;
|
|---|
| 11 | * you can redistribute it and/or modify it under the terms of the GNU
|
|---|
| 12 | * General Public License (GPL) as published by the Free Software
|
|---|
| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
|
|---|
| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
|
|---|
| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
|
|---|
| 16 | */
|
|---|
| 17 |
|
|---|
| 18 |
|
|---|
| 19 | #ifndef ____H_DATASTREAMIMPL
|
|---|
| 20 | #define ____H_DATASTREAMIMPL
|
|---|
| 21 |
|
|---|
| 22 | #include "DataStreamWrap.h"
|
|---|
| 23 |
|
|---|
| 24 | #include <iprt/semaphore.h>
|
|---|
| 25 |
|
|---|
| 26 | class ATL_NO_VTABLE DataStream
|
|---|
| 27 | : public DataStreamWrap
|
|---|
| 28 | {
|
|---|
| 29 | public:
|
|---|
| 30 | DECLARE_EMPTY_CTOR_DTOR(DataStream)
|
|---|
| 31 |
|
|---|
| 32 | HRESULT FinalConstruct();
|
|---|
| 33 | void FinalRelease();
|
|---|
| 34 |
|
|---|
| 35 | HRESULT init(unsigned long aBufferSize);
|
|---|
| 36 | void uninit();
|
|---|
| 37 |
|
|---|
| 38 | /// Feed data into the stream, used by the stream source.
|
|---|
| 39 | /// Blocks if the internal buffer cannot take anything, otherwise
|
|---|
| 40 | /// as much as the internal buffer can hold is taken (if smaller
|
|---|
| 41 | /// than @a cbWrite). Modeled after RTStrmWriteEx.
|
|---|
| 42 | int i_write(const void *pvBuf, size_t cbWrite, size_t *pcbWritten);
|
|---|
| 43 |
|
|---|
| 44 | /// Marks the end of the stream.
|
|---|
| 45 | int i_close();
|
|---|
| 46 |
|
|---|
| 47 | private:
|
|---|
| 48 | // wrapped IDataStream attributes and methods
|
|---|
| 49 | HRESULT getReadSize(ULONG *aReadSize);
|
|---|
| 50 | HRESULT read(ULONG aSize, ULONG aTimeoutMS, std::vector<BYTE> &aData);
|
|---|
| 51 |
|
|---|
| 52 | private:
|
|---|
| 53 | /** Maximum number of bytes the buffer can hold. */
|
|---|
| 54 | unsigned long m_aBufferSize;
|
|---|
| 55 | /** The temporary buffer the conversion process writes into and the user reads from. */
|
|---|
| 56 | std::vector<BYTE> m_aBuffer;
|
|---|
| 57 | /** Event semaphore for waiting until data is available. */
|
|---|
| 58 | RTSEMEVENT m_hSemEvtDataAvail;
|
|---|
| 59 | /** Event semaphore for waiting until there is room in the buffer for writing. */
|
|---|
| 60 | RTSEMEVENT m_hSemEvtBufSpcAvail;
|
|---|
| 61 | /** Flag whether the end of stream flag is set. */
|
|---|
| 62 | bool m_fEos;
|
|---|
| 63 | };
|
|---|
| 64 |
|
|---|
| 65 | #endif // !____H_DATASTREAMIMPL
|
|---|
| 66 |
|
|---|
| 67 | /* vi: set tabstop=4 shiftwidth=4 expandtab: */
|
|---|
