| 1 | /* $Id: DataStreamImpl.cpp 82968 2020-02-04 10:35:17Z vboxsync $ */
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| 2 | /** @file
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| 3 | * VirtualBox COM class implementation - DataStream
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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 |
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| 19 | /*********************************************************************************************************************************
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| 20 | * Header Files *
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| 21 | *********************************************************************************************************************************/
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| 22 | #define LOG_GROUP LOG_GROUP_MAIN_DATASTREAM
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| 23 | #include "DataStreamImpl.h"
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| 24 |
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| 25 | #include "AutoCaller.h"
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| 26 | #include "LoggingNew.h"
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| 27 | #include <iprt/errcore.h>
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| 28 |
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| 29 |
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| 30 | /*********************************************************************************************************************************
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| 31 | * Boilerplate constructor & destructor *
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| 32 | *********************************************************************************************************************************/
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| 33 |
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| 34 | DEFINE_EMPTY_CTOR_DTOR(DataStream)
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| 35 |
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| 36 | HRESULT DataStream::FinalConstruct()
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| 37 | {
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| 38 | LogFlowThisFunc(("\n"));
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| 39 | return BaseFinalConstruct();
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| 40 | }
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| 41 |
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| 42 | void DataStream::FinalRelease()
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| 43 | {
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| 44 | LogFlowThisFuncEnter();
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| 45 | uninit();
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| 46 | BaseFinalRelease();
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| 47 | LogFlowThisFuncLeave();
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| 48 | }
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| 49 |
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| 50 |
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| 51 | /*********************************************************************************************************************************
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| 52 | * Initializer & uninitializer *
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| 53 | *********************************************************************************************************************************/
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| 54 |
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| 55 | /**
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| 56 | * Initializes the DataStream object.
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| 57 | *
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| 58 | * @param aBufferSize Size of the intermediate buffer.
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| 59 | *
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| 60 | */
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| 61 | HRESULT DataStream::init(unsigned long aBufferSize)
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| 62 | {
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| 63 | LogFlowThisFunc(("cbBuffer=%zu\n", aBufferSize));
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| 64 |
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| 65 | /*
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| 66 | * Enclose the state transition NotReady->InInit->Ready
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| 67 | */
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| 68 | AutoInitSpan autoInitSpan(this);
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| 69 | AssertReturn(autoInitSpan.isOk(), E_FAIL);
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| 70 |
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| 71 | /*
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| 72 | * Allocate data instance.
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| 73 | */
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| 74 | HRESULT hrc = S_OK;
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| 75 |
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| 76 | m_hSemEvtDataAvail = NIL_RTSEMEVENT;
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| 77 | m_hSemEvtBufSpcAvail = NIL_RTSEMEVENT;
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| 78 | m_pBuffer = NULL;
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| 79 | m_fEos = false;
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| 80 | int vrc = RTSemEventCreate(&m_hSemEvtDataAvail);
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| 81 | if (RT_SUCCESS(vrc))
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| 82 | vrc = RTSemEventCreate(&m_hSemEvtBufSpcAvail);
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| 83 | if (RT_SUCCESS(vrc))
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| 84 | vrc = RTCircBufCreate(&m_pBuffer, aBufferSize);
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| 85 |
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| 86 | if (RT_FAILURE(vrc))
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| 87 | hrc = setErrorBoth(E_FAIL, vrc, tr("Failed to initialize data stream object (%Rrc)"), vrc);
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| 88 |
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| 89 | /*
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| 90 | * Done. Just update object readiness state.
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| 91 | */
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| 92 | if (SUCCEEDED(hrc))
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| 93 | autoInitSpan.setSucceeded();
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| 94 | else
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| 95 | autoInitSpan.setFailed(hrc);
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| 96 |
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| 97 | LogFlowThisFunc(("returns %Rhrc\n", hrc));
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| 98 | return hrc;
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| 99 | }
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| 100 |
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| 101 | /**
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| 102 | * Uninitializes the instance (called from FinalRelease()).
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| 103 | */
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| 104 | void DataStream::uninit()
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| 105 | {
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| 106 | LogFlowThisFuncEnter();
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| 107 |
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| 108 | /* Enclose the state transition Ready->InUninit->NotReady */
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| 109 | AutoUninitSpan autoUninitSpan(this);
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| 110 | if (!autoUninitSpan.uninitDone())
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| 111 | {
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| 112 | if (m_hSemEvtDataAvail != NIL_RTSEMEVENT)
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| 113 | RTSemEventDestroy(m_hSemEvtDataAvail);
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| 114 | if (m_hSemEvtBufSpcAvail != NIL_RTSEMEVENT)
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| 115 | RTSemEventDestroy(m_hSemEvtBufSpcAvail);
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| 116 | if (m_pBuffer != NULL)
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| 117 | RTCircBufDestroy(m_pBuffer);
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| 118 | m_hSemEvtDataAvail = NIL_RTSEMEVENT;
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| 119 | m_hSemEvtBufSpcAvail = NIL_RTSEMEVENT;
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| 120 | }
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| 121 |
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| 122 | LogFlowThisFuncLeave();
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| 123 | }
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| 124 |
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| 125 |
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| 126 | /*********************************************************************************************************************************
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| 127 | * IDataStream attributes *
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| 128 | *********************************************************************************************************************************/
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| 129 |
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| 130 | HRESULT DataStream::getReadSize(ULONG *aReadSize)
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| 131 | {
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| 132 | AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
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| 133 | *aReadSize = (ULONG)RTCircBufUsed(m_pBuffer);
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| 134 | return S_OK;
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| 135 | }
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| 136 |
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| 137 |
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| 138 | /*********************************************************************************************************************************
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| 139 | * IDataStream methods *
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| 140 | *********************************************************************************************************************************/
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| 141 |
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| 142 | HRESULT DataStream::read(ULONG aSize, ULONG aTimeoutMS, std::vector<BYTE> &aData)
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| 143 | {
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| 144 | /*
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| 145 | * Allocate return buffer.
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| 146 | */
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| 147 | try
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| 148 | {
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| 149 | aData.resize(aSize);
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| 150 | }
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| 151 | catch (std::bad_alloc &)
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| 152 | {
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| 153 | return E_OUTOFMEMORY;
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| 154 | }
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| 155 |
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| 156 | /*
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| 157 | * Do the reading. To play safe we exclusivly lock the object while doing this.
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| 158 | */
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| 159 | AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);
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| 160 |
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| 161 | int vrc = VINF_SUCCESS;
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| 162 | while ( !RTCircBufUsed(m_pBuffer)
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| 163 | && !m_fEos
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| 164 | && RT_SUCCESS(vrc))
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| 165 | {
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| 166 | /* Wait for something to become available. */
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| 167 | alock.release();
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| 168 | vrc = RTSemEventWait(m_hSemEvtDataAvail, aTimeoutMS == 0 ? RT_INDEFINITE_WAIT : aTimeoutMS);
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| 169 | alock.acquire();
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| 170 | }
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| 171 |
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| 172 | /*
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| 173 | * Manage the result.
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| 174 | */
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| 175 | HRESULT hrc = S_OK;
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| 176 | if ( RT_SUCCESS(vrc)
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| 177 | && RTCircBufUsed(m_pBuffer))
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| 178 | {
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| 179 |
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| 180 | size_t off = 0;
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| 181 | size_t cbCopy = RT_MIN(aSize, RTCircBufUsed(m_pBuffer));
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| 182 | if (cbCopy != aSize)
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| 183 | {
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| 184 | Assert(cbCopy < aSize);
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| 185 | aData.resize(cbCopy);
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| 186 | }
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| 187 |
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| 188 | while (cbCopy)
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| 189 | {
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| 190 | void *pvSrc = NULL;
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| 191 | size_t cbThisCopy = 0;
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| 192 |
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| 193 | RTCircBufAcquireReadBlock(m_pBuffer, cbCopy, &pvSrc, &cbThisCopy);
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| 194 | memcpy(&aData.front() + off, pvSrc, cbThisCopy);
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| 195 | RTCircBufReleaseReadBlock(m_pBuffer, cbThisCopy);
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| 196 |
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| 197 | cbCopy -= cbThisCopy;
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| 198 | off += cbThisCopy;
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| 199 | }
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| 200 | vrc = RTSemEventSignal(m_hSemEvtBufSpcAvail);
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| 201 | AssertRC(vrc);
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| 202 | }
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| 203 | else
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| 204 | {
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| 205 | Assert( RT_FAILURE(vrc)
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| 206 | || ( m_fEos
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| 207 | && !RTCircBufUsed(m_pBuffer)));
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| 208 |
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| 209 | aData.resize(0);
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| 210 | if (vrc == VERR_TIMEOUT)
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| 211 | hrc = VBOX_E_TIMEOUT;
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| 212 | else if (RT_FAILURE(vrc))
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| 213 | hrc = setErrorBoth(E_FAIL, vrc, tr("Error reading %u bytes: %Rrc"), aSize, vrc);
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| 214 | }
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| 215 |
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| 216 | return hrc;
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| 217 | }
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| 218 |
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| 219 |
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| 220 | /*********************************************************************************************************************************
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| 221 | * DataStream internal methods *
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| 222 | *********************************************************************************************************************************/
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| 223 |
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| 224 | /**
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| 225 | * Writes the given data into the temporary buffer blocking if it is full.
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| 226 | *
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| 227 | * @returns IPRT status code.
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| 228 | * @param pvBuf The data to write.
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| 229 | * @param cbWrite How much to write.
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| 230 | * @param pcbWritten Where to store the amount of data written.
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| 231 | */
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| 232 | int DataStream::i_write(const void *pvBuf, size_t cbWrite, size_t *pcbWritten)
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| 233 | {
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| 234 | AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);
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| 235 | AssertReturn(!m_fEos, VERR_INVALID_STATE);
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| 236 |
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| 237 | *pcbWritten = 0;
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| 238 |
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| 239 | int vrc = VINF_SUCCESS;
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| 240 | while ( !RTCircBufFree(m_pBuffer)
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| 241 | && RT_SUCCESS(vrc))
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| 242 | {
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| 243 | /* Wait for space to become available. */
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| 244 | alock.release();
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| 245 | vrc = RTSemEventWait(m_hSemEvtBufSpcAvail, RT_INDEFINITE_WAIT);
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| 246 | alock.acquire();
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| 247 | }
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| 248 |
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| 249 | if (RT_SUCCESS(vrc))
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| 250 | {
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| 251 | const uint8_t *pbBuf = (const uint8_t *)pvBuf;
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| 252 | size_t cbCopy = RT_MIN(cbWrite, RTCircBufFree(m_pBuffer));
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| 253 |
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| 254 | *pcbWritten = cbCopy;
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| 255 |
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| 256 | while (cbCopy)
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| 257 | {
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| 258 | void *pvDst = NULL;
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| 259 | size_t cbThisCopy = 0;
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| 260 |
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| 261 | RTCircBufAcquireWriteBlock(m_pBuffer, cbCopy, &pvDst, &cbThisCopy);
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| 262 | memcpy(pvDst, pbBuf, cbThisCopy);
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| 263 | RTCircBufReleaseWriteBlock(m_pBuffer, cbThisCopy);
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| 264 |
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| 265 | cbCopy -= cbThisCopy;
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| 266 | pbBuf += cbThisCopy;
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| 267 | }
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| 268 |
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| 269 | RTSemEventSignal(m_hSemEvtDataAvail);
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| 270 | }
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| 271 |
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| 272 | return vrc;
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| 273 | }
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| 274 |
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| 275 | /**
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| 276 | * Marks the end of the stream.
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| 277 | *
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| 278 | * @returns IPRT status code.
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| 279 | */
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| 280 | int DataStream::i_close()
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| 281 | {
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| 282 | AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);
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| 283 | m_fEos = true;
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| 284 | RTSemEventSignal(m_hSemEvtDataAvail);
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| 285 | return VINF_SUCCESS;
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| 286 | }
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| 287 |
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