| 1 | /* $Id: DataStreamImpl.h 98103 2023-01-17 14:15:46Z 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) 2018-2023 Oracle and/or its affiliates.
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| 8 | *
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| 9 | * This file is part of VirtualBox base platform packages, as
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| 10 | * available from https://www.virtualbox.org.
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| 11 | *
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| 12 | * This program is free software; you can redistribute it and/or
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| 13 | * modify it under the terms of the GNU General Public License
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| 14 | * as published by the Free Software Foundation, in version 3 of the
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| 15 | * License.
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| 16 | *
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| 17 | * This program is distributed in the hope that it will be useful, but
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| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | * General Public License for more details.
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| 21 | *
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| 22 | * You should have received a copy of the GNU General Public License
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| 23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | *
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| 25 | * SPDX-License-Identifier: GPL-3.0-only
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| 26 | */
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| 27 |
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| 28 | #ifndef MAIN_INCLUDED_DataStreamImpl_h
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| 29 | #define MAIN_INCLUDED_DataStreamImpl_h
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| 30 | #ifndef RT_WITHOUT_PRAGMA_ONCE
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| 31 | # pragma once
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| 32 | #endif
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| 33 |
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| 34 | #include "DataStreamWrap.h"
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| 35 |
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| 36 | #include <iprt/circbuf.h>
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| 37 | #include <iprt/semaphore.h>
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| 38 |
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| 39 | class ATL_NO_VTABLE DataStream
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| 40 | : public DataStreamWrap
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| 41 | {
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| 42 | public:
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| 43 | DECLARE_COMMON_CLASS_METHODS(DataStream)
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| 44 |
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| 45 | HRESULT FinalConstruct();
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| 46 | void FinalRelease();
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| 47 |
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| 48 | HRESULT init(unsigned long aBufferSize);
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| 49 | void uninit();
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| 50 |
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| 51 | /// Feed data into the stream, used by the stream source.
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| 52 | /// Blocks if the internal buffer cannot take anything, otherwise
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| 53 | /// as much as the internal buffer can hold is taken (if smaller
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| 54 | /// than @a cbWrite). Modeled after RTStrmWriteEx.
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| 55 | int i_write(const void *pvBuf, size_t cbWrite, size_t *pcbWritten);
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| 56 |
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| 57 | /// Marks the end of the stream.
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| 58 | int i_close();
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| 59 |
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| 60 | private:
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| 61 | // wrapped IDataStream attributes and methods
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| 62 | HRESULT getReadSize(ULONG *aReadSize);
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| 63 | HRESULT read(ULONG aSize, ULONG aTimeoutMS, std::vector<BYTE> &aData);
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| 64 |
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| 65 | private:
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| 66 | /** The temporary buffer the conversion process writes into and the user reads from. */
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| 67 | PRTCIRCBUF m_pBuffer;
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| 68 | /** Event semaphore for waiting until data is available. */
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| 69 | RTSEMEVENT m_hSemEvtDataAvail;
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| 70 | /** Event semaphore for waiting until there is room in the buffer for writing. */
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| 71 | RTSEMEVENT m_hSemEvtBufSpcAvail;
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| 72 | /** Flag whether the end of stream flag is set. */
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| 73 | bool m_fEos;
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| 74 | };
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| 75 |
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| 76 | #endif /* !MAIN_INCLUDED_DataStreamImpl_h */
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| 77 |
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| 78 | /* vi: set tabstop=4 shiftwidth=4 expandtab: */
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