| 1 | /* $Id: DataStreamImpl.cpp 93115 2022-01-01 11:31:46Z vboxsync $ */
|
|---|
| 2 | /** @file
|
|---|
| 3 | * VirtualBox COM class implementation - DataStream
|
|---|
| 4 | */
|
|---|
| 5 |
|
|---|
| 6 | /*
|
|---|
| 7 | * Copyright (C) 2018-2022 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 | /*********************************************************************************************************************************
|
|---|
| 20 | * Header Files *
|
|---|
| 21 | *********************************************************************************************************************************/
|
|---|
| 22 | #define LOG_GROUP LOG_GROUP_MAIN_DATASTREAM
|
|---|
| 23 | #include "DataStreamImpl.h"
|
|---|
| 24 |
|
|---|
| 25 | #include "AutoCaller.h"
|
|---|
| 26 | #include "LoggingNew.h"
|
|---|
| 27 | #include <iprt/errcore.h>
|
|---|
| 28 |
|
|---|
| 29 |
|
|---|
| 30 | /*********************************************************************************************************************************
|
|---|
| 31 | * Boilerplate constructor & destructor *
|
|---|
| 32 | *********************************************************************************************************************************/
|
|---|
| 33 |
|
|---|
| 34 | DEFINE_EMPTY_CTOR_DTOR(DataStream)
|
|---|
| 35 |
|
|---|
| 36 | HRESULT DataStream::FinalConstruct()
|
|---|
| 37 | {
|
|---|
| 38 | LogFlowThisFunc(("\n"));
|
|---|
| 39 | return BaseFinalConstruct();
|
|---|
| 40 | }
|
|---|
| 41 |
|
|---|
| 42 | void DataStream::FinalRelease()
|
|---|
| 43 | {
|
|---|
| 44 | LogFlowThisFuncEnter();
|
|---|
| 45 | uninit();
|
|---|
| 46 | BaseFinalRelease();
|
|---|
| 47 | LogFlowThisFuncLeave();
|
|---|
| 48 | }
|
|---|
| 49 |
|
|---|
| 50 |
|
|---|
| 51 | /*********************************************************************************************************************************
|
|---|
| 52 | * Initializer & uninitializer *
|
|---|
| 53 | *********************************************************************************************************************************/
|
|---|
| 54 |
|
|---|
| 55 | /**
|
|---|
| 56 | * Initializes the DataStream object.
|
|---|
| 57 | *
|
|---|
| 58 | * @param aBufferSize Size of the intermediate buffer.
|
|---|
| 59 | *
|
|---|
| 60 | */
|
|---|
| 61 | HRESULT DataStream::init(unsigned long aBufferSize)
|
|---|
| 62 | {
|
|---|
| 63 | LogFlowThisFunc(("cbBuffer=%zu\n", aBufferSize));
|
|---|
| 64 |
|
|---|
| 65 | /*
|
|---|
| 66 | * Enclose the state transition NotReady->InInit->Ready
|
|---|
| 67 | */
|
|---|
| 68 | AutoInitSpan autoInitSpan(this);
|
|---|
| 69 | AssertReturn(autoInitSpan.isOk(), E_FAIL);
|
|---|
| 70 |
|
|---|
| 71 | /*
|
|---|
| 72 | * Allocate data instance.
|
|---|
| 73 | */
|
|---|
| 74 | HRESULT hrc = S_OK;
|
|---|
| 75 |
|
|---|
| 76 | m_hSemEvtDataAvail = NIL_RTSEMEVENT;
|
|---|
| 77 | m_hSemEvtBufSpcAvail = NIL_RTSEMEVENT;
|
|---|
| 78 | m_pBuffer = NULL;
|
|---|
| 79 | m_fEos = false;
|
|---|
| 80 | int vrc = RTSemEventCreate(&m_hSemEvtDataAvail);
|
|---|
| 81 | if (RT_SUCCESS(vrc))
|
|---|
| 82 | vrc = RTSemEventCreate(&m_hSemEvtBufSpcAvail);
|
|---|
| 83 | if (RT_SUCCESS(vrc))
|
|---|
| 84 | vrc = RTCircBufCreate(&m_pBuffer, aBufferSize);
|
|---|
| 85 |
|
|---|
| 86 | if (RT_FAILURE(vrc))
|
|---|
| 87 | hrc = setErrorBoth(E_FAIL, vrc, tr("Failed to initialize data stream object (%Rrc)"), vrc);
|
|---|
| 88 |
|
|---|
| 89 | /*
|
|---|
| 90 | * Done. Just update object readiness state.
|
|---|
| 91 | */
|
|---|
| 92 | if (SUCCEEDED(hrc))
|
|---|
| 93 | autoInitSpan.setSucceeded();
|
|---|
| 94 | else
|
|---|
| 95 | autoInitSpan.setFailed(hrc);
|
|---|
| 96 |
|
|---|
| 97 | LogFlowThisFunc(("returns %Rhrc\n", hrc));
|
|---|
| 98 | return hrc;
|
|---|
| 99 | }
|
|---|
| 100 |
|
|---|
| 101 | /**
|
|---|
| 102 | * Uninitializes the instance (called from FinalRelease()).
|
|---|
| 103 | */
|
|---|
| 104 | void DataStream::uninit()
|
|---|
| 105 | {
|
|---|
| 106 | LogFlowThisFuncEnter();
|
|---|
| 107 |
|
|---|
| 108 | /* Enclose the state transition Ready->InUninit->NotReady */
|
|---|
| 109 | AutoUninitSpan autoUninitSpan(this);
|
|---|
| 110 | if (!autoUninitSpan.uninitDone())
|
|---|
| 111 | {
|
|---|
| 112 | if (m_hSemEvtDataAvail != NIL_RTSEMEVENT)
|
|---|
| 113 | RTSemEventDestroy(m_hSemEvtDataAvail);
|
|---|
| 114 | if (m_hSemEvtBufSpcAvail != NIL_RTSEMEVENT)
|
|---|
| 115 | RTSemEventDestroy(m_hSemEvtBufSpcAvail);
|
|---|
| 116 | if (m_pBuffer != NULL)
|
|---|
| 117 | RTCircBufDestroy(m_pBuffer);
|
|---|
| 118 | m_hSemEvtDataAvail = NIL_RTSEMEVENT;
|
|---|
| 119 | m_hSemEvtBufSpcAvail = NIL_RTSEMEVENT;
|
|---|
| 120 | }
|
|---|
| 121 |
|
|---|
| 122 | LogFlowThisFuncLeave();
|
|---|
| 123 | }
|
|---|
| 124 |
|
|---|
| 125 |
|
|---|
| 126 | /*********************************************************************************************************************************
|
|---|
| 127 | * IDataStream attributes *
|
|---|
| 128 | *********************************************************************************************************************************/
|
|---|
| 129 |
|
|---|
| 130 | HRESULT DataStream::getReadSize(ULONG *aReadSize)
|
|---|
| 131 | {
|
|---|
| 132 | AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
|
|---|
| 133 | *aReadSize = (ULONG)RTCircBufUsed(m_pBuffer);
|
|---|
| 134 | return S_OK;
|
|---|
| 135 | }
|
|---|
| 136 |
|
|---|
| 137 |
|
|---|
| 138 | /*********************************************************************************************************************************
|
|---|
| 139 | * IDataStream methods *
|
|---|
| 140 | *********************************************************************************************************************************/
|
|---|
| 141 |
|
|---|
| 142 | HRESULT DataStream::read(ULONG aSize, ULONG aTimeoutMS, std::vector<BYTE> &aData)
|
|---|
| 143 | {
|
|---|
| 144 | /*
|
|---|
| 145 | * Allocate return buffer.
|
|---|
| 146 | */
|
|---|
| 147 | try
|
|---|
| 148 | {
|
|---|
| 149 | aData.resize(aSize);
|
|---|
| 150 | }
|
|---|
| 151 | catch (std::bad_alloc &)
|
|---|
| 152 | {
|
|---|
| 153 | return E_OUTOFMEMORY;
|
|---|
| 154 | }
|
|---|
| 155 |
|
|---|
| 156 | /*
|
|---|
| 157 | * Do the reading. To play safe we exclusivly lock the object while doing this.
|
|---|
| 158 | */
|
|---|
| 159 | AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);
|
|---|
| 160 |
|
|---|
| 161 | int vrc = VINF_SUCCESS;
|
|---|
| 162 | while ( !RTCircBufUsed(m_pBuffer)
|
|---|
| 163 | && !m_fEos
|
|---|
| 164 | && RT_SUCCESS(vrc))
|
|---|
| 165 | {
|
|---|
| 166 | /* Wait for something to become available. */
|
|---|
| 167 | alock.release();
|
|---|
| 168 | vrc = RTSemEventWait(m_hSemEvtDataAvail, aTimeoutMS == 0 ? RT_INDEFINITE_WAIT : aTimeoutMS);
|
|---|
| 169 | alock.acquire();
|
|---|
| 170 | }
|
|---|
| 171 |
|
|---|
| 172 | /*
|
|---|
| 173 | * Manage the result.
|
|---|
| 174 | */
|
|---|
| 175 | HRESULT hrc = S_OK;
|
|---|
| 176 | if ( RT_SUCCESS(vrc)
|
|---|
| 177 | && RTCircBufUsed(m_pBuffer))
|
|---|
| 178 | {
|
|---|
| 179 |
|
|---|
| 180 | size_t off = 0;
|
|---|
| 181 | size_t cbCopy = RT_MIN(aSize, RTCircBufUsed(m_pBuffer));
|
|---|
| 182 | if (cbCopy != aSize)
|
|---|
| 183 | {
|
|---|
| 184 | Assert(cbCopy < aSize);
|
|---|
| 185 | aData.resize(cbCopy);
|
|---|
| 186 | }
|
|---|
| 187 |
|
|---|
| 188 | while (cbCopy)
|
|---|
| 189 | {
|
|---|
| 190 | void *pvSrc = NULL;
|
|---|
| 191 | size_t cbThisCopy = 0;
|
|---|
| 192 |
|
|---|
| 193 | RTCircBufAcquireReadBlock(m_pBuffer, cbCopy, &pvSrc, &cbThisCopy);
|
|---|
| 194 | memcpy(&aData.front() + off, pvSrc, cbThisCopy);
|
|---|
| 195 | RTCircBufReleaseReadBlock(m_pBuffer, cbThisCopy);
|
|---|
| 196 |
|
|---|
| 197 | cbCopy -= cbThisCopy;
|
|---|
| 198 | off += cbThisCopy;
|
|---|
| 199 | }
|
|---|
| 200 | vrc = RTSemEventSignal(m_hSemEvtBufSpcAvail);
|
|---|
| 201 | AssertRC(vrc);
|
|---|
| 202 | }
|
|---|
| 203 | else
|
|---|
| 204 | {
|
|---|
| 205 | Assert( RT_FAILURE(vrc)
|
|---|
| 206 | || ( m_fEos
|
|---|
| 207 | && !RTCircBufUsed(m_pBuffer)));
|
|---|
| 208 |
|
|---|
| 209 | aData.resize(0);
|
|---|
| 210 | if (vrc == VERR_TIMEOUT)
|
|---|
| 211 | hrc = VBOX_E_TIMEOUT;
|
|---|
| 212 | else if (RT_FAILURE(vrc))
|
|---|
| 213 | hrc = setErrorBoth(E_FAIL, vrc, tr("Error reading %u bytes: %Rrc", "", aSize), aSize, vrc);
|
|---|
| 214 | }
|
|---|
| 215 |
|
|---|
| 216 | return hrc;
|
|---|
| 217 | }
|
|---|
| 218 |
|
|---|
| 219 |
|
|---|
| 220 | /*********************************************************************************************************************************
|
|---|
| 221 | * DataStream internal methods *
|
|---|
| 222 | *********************************************************************************************************************************/
|
|---|
| 223 |
|
|---|
| 224 | /**
|
|---|
| 225 | * Writes the given data into the temporary buffer blocking if it is full.
|
|---|
| 226 | *
|
|---|
| 227 | * @returns IPRT status code.
|
|---|
| 228 | * @param pvBuf The data to write.
|
|---|
| 229 | * @param cbWrite How much to write.
|
|---|
| 230 | * @param pcbWritten Where to store the amount of data written.
|
|---|
| 231 | */
|
|---|
| 232 | int DataStream::i_write(const void *pvBuf, size_t cbWrite, size_t *pcbWritten)
|
|---|
| 233 | {
|
|---|
| 234 | AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);
|
|---|
| 235 | AssertReturn(!m_fEos, VERR_INVALID_STATE);
|
|---|
| 236 |
|
|---|
| 237 | *pcbWritten = 0;
|
|---|
| 238 |
|
|---|
| 239 | int vrc = VINF_SUCCESS;
|
|---|
| 240 | while ( !RTCircBufFree(m_pBuffer)
|
|---|
| 241 | && RT_SUCCESS(vrc))
|
|---|
| 242 | {
|
|---|
| 243 | /* Wait for space to become available. */
|
|---|
| 244 | alock.release();
|
|---|
| 245 | vrc = RTSemEventWait(m_hSemEvtBufSpcAvail, RT_INDEFINITE_WAIT);
|
|---|
| 246 | alock.acquire();
|
|---|
| 247 | }
|
|---|
| 248 |
|
|---|
| 249 | if (RT_SUCCESS(vrc))
|
|---|
| 250 | {
|
|---|
| 251 | const uint8_t *pbBuf = (const uint8_t *)pvBuf;
|
|---|
| 252 | size_t cbCopy = RT_MIN(cbWrite, RTCircBufFree(m_pBuffer));
|
|---|
| 253 |
|
|---|
| 254 | *pcbWritten = cbCopy;
|
|---|
| 255 |
|
|---|
| 256 | while (cbCopy)
|
|---|
| 257 | {
|
|---|
| 258 | void *pvDst = NULL;
|
|---|
| 259 | size_t cbThisCopy = 0;
|
|---|
| 260 |
|
|---|
| 261 | RTCircBufAcquireWriteBlock(m_pBuffer, cbCopy, &pvDst, &cbThisCopy);
|
|---|
| 262 | memcpy(pvDst, pbBuf, cbThisCopy);
|
|---|
| 263 | RTCircBufReleaseWriteBlock(m_pBuffer, cbThisCopy);
|
|---|
| 264 |
|
|---|
| 265 | cbCopy -= cbThisCopy;
|
|---|
| 266 | pbBuf += cbThisCopy;
|
|---|
| 267 | }
|
|---|
| 268 |
|
|---|
| 269 | RTSemEventSignal(m_hSemEvtDataAvail);
|
|---|
| 270 | }
|
|---|
| 271 |
|
|---|
| 272 | return vrc;
|
|---|
| 273 | }
|
|---|
| 274 |
|
|---|
| 275 | /**
|
|---|
| 276 | * Marks the end of the stream.
|
|---|
| 277 | *
|
|---|
| 278 | * @returns IPRT status code.
|
|---|
| 279 | */
|
|---|
| 280 | int DataStream::i_close()
|
|---|
| 281 | {
|
|---|
| 282 | AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);
|
|---|
| 283 | m_fEos = true;
|
|---|
| 284 | RTSemEventSignal(m_hSemEvtDataAvail);
|
|---|
| 285 | return VINF_SUCCESS;
|
|---|
| 286 | }
|
|---|
| 287 |
|
|---|
