fswtchr.cpp
上传用户:dangjiwu
上传日期:2013-07-19
资源大小:42019k
文件大小:27k
- /* ***** BEGIN LICENSE BLOCK *****
- * Version: RCSL 1.0/RPSL 1.0
- *
- * Portions Copyright (c) 1995-2002 RealNetworks, Inc. All Rights Reserved.
- *
- * The contents of this file, and the files included with this file, are
- * subject to the current version of the RealNetworks Public Source License
- * Version 1.0 (the "RPSL") available at
- * http://www.helixcommunity.org/content/rpsl unless you have licensed
- * the file under the RealNetworks Community Source License Version 1.0
- * (the "RCSL") available at http://www.helixcommunity.org/content/rcsl,
- * in which case the RCSL will apply. You may also obtain the license terms
- * directly from RealNetworks. You may not use this file except in
- * compliance with the RPSL or, if you have a valid RCSL with RealNetworks
- * applicable to this file, the RCSL. Please see the applicable RPSL or
- * RCSL for the rights, obligations and limitations governing use of the
- * contents of the file.
- *
- * This file is part of the Helix DNA Technology. RealNetworks is the
- * developer of the Original Code and owns the copyrights in the portions
- * it created.
- *
- * This file, and the files included with this file, is distributed and made
- * available on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND REALNETWORKS HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS
- * FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- *
- * Technology Compatibility Kit Test Suite(s) Location:
- * http://www.helixcommunity.org/content/tck
- *
- * Contributor(s):
- *
- * ***** END LICENSE BLOCK ***** */
- /****************************************************************************
- * Includes
- */
- #include "fswtchr.h"
- #include "hxassert.h"
- #include "qtffrefcounter.h"
- /****************************************************************************
- * Local Defines
- */
- #define MAX_CHUNK_SIZE 0x0000FFFF // 64K
- #define MAX_CONSECUTIVE_FRAGMENT_LOADS 8 // Do not set to 0
- /****************************************************************************
- * Class CFileSwitcher
- */
- /****************************************************************************
- * Constructor/Destructor
- */
- CFileSwitcher::CFileSwitcher(void)
- : m_uMaxChildCount(0)
- , m_uCurrentChildCount(0)
- , m_pHandleTable(NULL)
- , m_ulFlags(0)
- , m_ulSize(0)
- , m_ulChunkSize(0)
- , m_ulProcessedSize(0)
- , m_ulFragmentCount(0)
- , m_bRelative(FALSE)
- , m_pBuffer(NULL)
- , m_pClassFactory(NULL)
- , m_pCurrentHandle(NULL)
- , m_pResponse(NULL)
- , m_pScheduler(NULL)
- , m_State(FSWCHR_Offline)
- , m_lRefCount(0)
- , m_uLastDisownedChild(0)
- , m_bClosing(FALSE)
- , m_CloseStatus(HXR_OK)
- , m_bSyncMode(FALSE)
- {
- g_nRefCount_qtff++;
- }
- CFileSwitcher::~CFileSwitcher()
- {
- Reset();
- g_nRefCount_qtff--;
- }
- /****************************************************************************
- * IHXFileSwitcher private methods
- */
- /****************************************************************************
- * Reset
- */
- inline void CFileSwitcher::Reset(void)
- {
- HX_VECTOR_DELETE(m_pHandleTable);
- HX_RELEASE(m_pResponse);
- HX_RELEASE(m_pBuffer);
- HX_RELEASE(m_pClassFactory);
- HX_RELEASE(m_pScheduler);
- m_uCurrentChildCount = 0;
- }
- /****************************************************************************
- * HandleFailureAsync
- */
- HX_RESULT CFileSwitcher::HandleFailureAsync(HX_RESULT status)
- {
- // Asynchronous failures occur only during Read, Write or Seek
- // process while a new FileHandle is beeing formed (since the
- // operation was requested on a file without a handle present
- // in tha HandleTable).
- HX_RESULT retVal;
- HX_ASSERT(status != HXR_OK);
- HX_ASSERT(m_pCurrentHandle);
- HX_RELEASE(m_pBuffer);
- if (m_pCurrentHandle != m_pHandleTable)
- {
- m_pCurrentHandle->Clear();
- m_uCurrentChildCount--;
- }
- switch (m_State)
- {
- case FSWCHR_ProcRead:
- retVal = ReadDone(status, NULL);
- break;
- case FSWCHR_ProcSeek:
- retVal = SeekDone(status);
- break;
- case FSWCHR_ProcWrite:
- retVal = WriteDone(status);
- break;
- case FSWCHR_ProcAdvise:
- retVal = HXR_OK; // Silent failure
- break;
- default:
- retVal = HXR_UNEXPECTED;
- break;
- }
- return retVal;
- }
- /****************************************************************************
- * HandleFailureSync
- */
- HX_RESULT CFileSwitcher::HandleFailureSync(HX_RESULT status)
- {
- // Synchronous failures may occur during Read, Write, Seek
- // process while a correct FileHandle is preformed and known.
- // Sync. failure also may occur during initalization of this
- // object.
- HX_ASSERT(status != HXR_OK);
- HX_RELEASE(m_pResponse);
- HX_RELEASE(m_pBuffer);
- if (m_State == FSWCHR_ProcInit)
- {
- HX_VECTOR_DELETE(m_pHandleTable);
- m_State = FSWCHR_Offline;
- }
- else
- {
- m_State = FSWCHR_Ready;
- }
- return status;
- }
- /****************************************************************************
- * FindFileHandle
- */
- inline CFileSwitcher::FileHandle* CFileSwitcher::FindFileHandle(const char* pFileName)
- {
- FileHandle* pFileHandle;
- FileHandle* pFreeHandle = NULL;
- UINT16 uChildrenExamined;
-
- if (pFileName == NULL)
- {
- return m_pHandleTable;
- }
-
- for (uChildrenExamined = 0, pFileHandle = m_pHandleTable + 1;
- uChildrenExamined < m_uCurrentChildCount;
- pFileHandle++)
- {
- if (pFileHandle->m_pFileName)
- {
- if (!strcmp(pFileHandle->m_pFileName, pFileName))
- {
- return pFileHandle;
- }
-
- uChildrenExamined++;
- }
- else
- {
- pFreeHandle = pFileHandle;
- }
- }
-
- if (m_State == FSWCHR_ProcAdvise)
- {
- // Do not page-in on attempt to Advise. Advise must be synchronous.
- return NULL;
- }
- // Appropriate file handle wasn't found, so find a
- // free one to make a new one
- pFileHandle = pFreeHandle;
- if (m_uCurrentChildCount < m_uMaxChildCount)
- {
- pFileHandle = m_pHandleTable + m_uCurrentChildCount + 1;
-
- HX_ASSERT(!pFileHandle->m_pFileName);
- HX_ASSERT(!pFileHandle->m_pFileObject);
- }
- // make new handle
- if (pFileHandle)
- {
- if (pFileHandle->SetName(pFileName))
- {
- m_uCurrentChildCount++;
- }
- else
- {
- pFileHandle = NULL;
- }
- }
- return pFileHandle;
- }
- /****************************************************************************
- * SelectStaleHandle
- */
- inline CFileSwitcher::FileHandle* CFileSwitcher::SelectStaleHandle(void)
- {
- FileHandle *pFileHandle = NULL;
-
- // Getting a stale handle is only valid when
- // there is no more room for the child handles
- HX_ASSERT(m_uMaxChildCount == m_uCurrentChildCount);
- if (m_uMaxChildCount > 0)
- {
- if (m_uLastDisownedChild < m_uMaxChildCount)
- {
- m_uLastDisownedChild++;
- }
- else
- {
- m_uLastDisownedChild = 1;
- }
-
- pFileHandle = m_pHandleTable + m_uLastDisownedChild;
- HX_ASSERT(pFileHandle->m_pFileName);
- }
- return pFileHandle;
- }
- /****************************************************************************
- * GetFileHandle
- */
- HX_RESULT CFileSwitcher::GetFileHandle(const char* pFileName)
- {
- HX_RESULT retVal;
- m_pCurrentHandle = FindFileHandle(pFileName);
- if (m_pCurrentHandle)
- {
- if (m_pCurrentHandle->m_pFileObject)
- {
- // A set-up handle exists
- retVal = FileHandleReady();
- }
- else
- {
- IHXGetFileFromSamePool* pFilePool;
- // Handle was made but needs set-up
- HX_ASSERT(m_pHandleTable->m_pFileObject);
- retVal = m_pHandleTable->m_pFileObject->QueryInterface(
- IID_IHXGetFileFromSamePool,
- (void**) &pFilePool);
- if (SUCCEEDED(retVal))
- {
- // Set-up is made by duplicating the root file object
- retVal = pFilePool->GetFileObjectFromPool(
- (IHXGetFileFromSamePoolResponse*) this);
- pFilePool->Release();
- }
- }
- }
- else if (m_State == FSWCHR_ProcAdvise)
- {
- // Cannot advise paged-out file object
- retVal = HXR_FAIL;
- }
- else
- {
- // If the file handle table is full, select a stale
- // handle and dispose of it so the room is made for
- // the currently needed handle,
- if (m_uMaxChildCount == m_uCurrentChildCount)
- {
- m_pCurrentHandle = SelectStaleHandle();
- if (m_pCurrentHandle)
- {
- m_pCurrentHandle->SetName(pFileName);
- retVal = CloseFileHandleObject(m_pCurrentHandle);
- }
- else
- {
- retVal = HXR_FAIL;
- }
- }
- else
- {
- // We must be out memory if we failed to find or
- // make a file handle and the file handle table
- // still has slots available.
- retVal = HXR_OUTOFMEMORY;
- }
- }
- if (FAILED(retVal))
- {
- retVal = HandleFailureSync(retVal);
- }
- return retVal;
- }
- /****************************************************************************
- * CloseFileHandle
- */
- HX_RESULT CFileSwitcher::CloseFileHandleObject(FileHandle *pFileHandle)
- {
- HX_RESULT retVal;
- IHXFileObject *pFileObject;
- HX_ASSERT(pFileHandle);
- pFileObject = pFileHandle->m_pFileObject;
- if (pFileObject)
- {
- pFileHandle->m_pFileObject = NULL;
- retVal = pFileObject->Close();
- pFileObject->Release();
- }
- else
- {
- CloseDone(HXR_OK);
- retVal = HXR_OK;
- }
- return retVal;
- }
- /****************************************************************************
- * FileHandleReady
- */
- HX_RESULT CFileSwitcher::FileHandleReady(void)
- {
- HX_RESULT retVal;
- HX_ASSERT(m_pCurrentHandle);
- HX_ASSERT(m_pCurrentHandle->m_pFileObject);
- switch (m_State)
- {
- case FSWCHR_ProcRead:
- m_ulProcessedSize = 0;
- return ProcessRead();
- case FSWCHR_ProcSeek:
- return m_pCurrentHandle->m_pFileObject->Seek(m_ulSize, m_bRelative);
- case FSWCHR_ProcWrite:
- {
- IHXBuffer* pBuffer;
- HX_RESULT retVal;
-
- HX_ASSERT(m_pBuffer);
- HX_RELEASE(m_pBuffer);
- pBuffer = m_pBuffer;
- m_pBuffer = NULL;
-
- retVal = m_pCurrentHandle->m_pFileObject->Write(pBuffer);
-
- pBuffer->Release();
-
- return retVal;
- }
- case FSWCHR_ProcAdvise:
- retVal = m_pCurrentHandle->m_pFileObject->Advise(m_ulSize);
- if (SUCCEEDED(retVal))
- {
- if (m_ulSize == HX_FILEADVISE_SYNCACCESS)
- {
- m_bSyncMode = TRUE;
- }
- else if (m_ulSize == HX_FILEADVISE_ASYNCACCESS)
- {
- m_bSyncMode = FALSE;
- }
- }
- m_State = FSWCHR_Ready;
- return retVal;
- default:
- // nothing to do
- break;
- }
- return HXR_UNEXPECTED;
- }
- /****************************************************************************
- * ProcessRead
- */
- HX_RESULT CFileSwitcher::ProcessRead(void)
- {
- ULONG32 ulSize = m_ulSize - m_ulProcessedSize;
- m_ulChunkSize = (ulSize <= MAX_CHUNK_SIZE) ?
- ulSize : MAX_CHUNK_SIZE;
- return m_pCurrentHandle->m_pFileObject->Read(m_ulChunkSize);
- }
- /****************************************************************************
- * ReadNextFragment
- */
- HX_RESULT CFileSwitcher::ReadNextFragment(void)
- {
- HX_RESULT retVal = HXR_FAIL;
- if ((!m_bClosing) &&
- m_pCurrentHandle &&
- m_pCurrentHandle->m_pFileObject)
- {
- if (m_bSyncMode ||
- (m_ulFragmentCount < MAX_CONSECUTIVE_FRAGMENT_LOADS))
- {
- retVal = ProcessRead();
- }
- else
- {
- m_ulFragmentCount = 0;
- retVal = m_pScheduler->RelativeEnter(this, 0);
- }
- }
- if (FAILED(retVal))
- {
- retVal = ReadDone(HXR_FAIL, NULL);
- }
- return retVal;
- }
- /****************************************************************************
- * IHXFileSwitcher methods - Main interface
- */
- /****************************************************************************
- * Init
- */
- STDMETHODIMP CFileSwitcher::Init(IHXFileObject* pFileObject,
- ULONG32 ulFlags,
- IHXFileResponse* pResponse,
- IUnknown* pContext,
- UINT16 uMaxChildCount)
- {
- HX_RESULT retVal = HXR_OK;
- if (m_State != FSWCHR_Offline)
- {
- retVal = HXR_UNEXPECTED;
- }
- if (SUCCEEDED(retVal))
- {
- Reset();
- HX_ASSERT(pFileObject);
- HX_ASSERT(pResponse);
- HX_ASSERT(pContext);
- m_uMaxChildCount = uMaxChildCount;
- m_ulFlags = ulFlags;
-
- // First Entry in the table is used as RootHandle
- m_pHandleTable = new FileHandle[m_uMaxChildCount + 1];
- if (m_pHandleTable == NULL)
- {
- retVal = HXR_OUTOFMEMORY;
- }
- }
- if (SUCCEEDED(retVal))
- {
- retVal = pContext->QueryInterface(
- IID_IHXCommonClassFactory,
- (void**) &m_pClassFactory);
- }
- if (SUCCEEDED(retVal))
- {
- retVal = pContext->QueryInterface(
- IID_IHXScheduler,
- (void**) &m_pScheduler);
- }
- if (SUCCEEDED(retVal))
- {
- HX_ASSERT(!m_pResponse);
- m_pHandleTable = m_pHandleTable;
- m_pHandleTable->m_pFileObject = pFileObject;
- pFileObject->AddRef();
- m_State = FSWCHR_ProcInit;
- m_pResponse = pResponse;
- m_pResponse->AddRef();
- retVal = pFileObject->Init(m_ulFlags, (IHXFileResponse*) this);
- if (FAILED(retVal))
- {
- retVal = HandleFailureSync(retVal);
- }
- }
- return retVal;
- }
- /****************************************************************************
- * Read
- */
- STDMETHODIMP CFileSwitcher::Read(ULONG32 ulSize,
- IHXFileResponse* pResponse,
- const char* pFileName)
- {
- HX_RESULT retVal = HXR_UNEXPECTED;
- if ((m_State == FSWCHR_Ready) && (!m_bClosing))
- {
- HX_ASSERT(!m_pResponse);
- m_ulSize = ulSize;
- m_pResponse = pResponse;
- m_pResponse->AddRef();
- m_State = FSWCHR_ProcRead;
- retVal = GetFileHandle(pFileName);
- }
- return retVal;
- }
- /****************************************************************************
- * Write
- */
- STDMETHODIMP CFileSwitcher::Write(IHXBuffer* pBuffer,
- IHXFileResponse* pResponse,
- const char* pFileName)
- {
- HX_RESULT retVal = HXR_UNEXPECTED;
- if ((m_State == FSWCHR_Ready) && (!m_bClosing))
- {
- HX_ASSERT(!m_pResponse);
- HX_ASSERT(!m_pBuffer);
- m_pBuffer = pBuffer;
- m_pBuffer->AddRef();
- m_pResponse = pResponse;
- m_pResponse->AddRef();
- m_State = FSWCHR_ProcWrite;
- retVal = GetFileHandle(pFileName);
- }
- return retVal;
- }
- /****************************************************************************
- * Seek
- */
- STDMETHODIMP CFileSwitcher::Seek(ULONG32 ulOffset,
- BOOL bRelative,
- IHXFileResponse* pResponse,
- const char* pFileName)
- {
- HX_RESULT retVal = HXR_UNEXPECTED;
- if ((m_State == FSWCHR_Ready) && (!m_bClosing))
- {
- HX_ASSERT(!m_pResponse);
- m_ulSize = ulOffset;
- m_bRelative = bRelative;
- m_pResponse = pResponse;
- m_pResponse->AddRef();
- m_State = FSWCHR_ProcSeek;
- retVal = GetFileHandle(pFileName);
- }
- return retVal;
- }
- /****************************************************************************
- * Advise
- */
- STDMETHODIMP CFileSwitcher::Advise(ULONG32 ulInfo,
- const char* pFileName)
- {
- HX_RESULT retVal = HXR_UNEXPECTED;
- if ((m_State == FSWCHR_Ready) && (!m_bClosing))
- {
- HX_ASSERT(!m_pResponse);
- m_ulSize = ulInfo;
- m_State = FSWCHR_ProcAdvise;
- retVal = GetFileHandle(pFileName);
- }
- return retVal;
- }
- /****************************************************************************
- * Close
- */
- STDMETHODIMP CFileSwitcher::Close(IHXFileResponse *pResponse,
- const char* pFileName)
- {
- HX_RESULT retVal = HXR_UNEXPECTED;
- if ((m_State != FSWCHR_Offline) && (!m_bClosing))
- {
- if (pFileName)
- {
- // File Specific Closing - must be synchronous
- if (m_State == FSWCHR_Ready)
- {
- FileHandle *pFileHandle;
-
- HX_ASSERT(!m_pResponse);
- m_pResponse = pResponse;
- pResponse->AddRef();
- retVal = HXR_OK;
- m_State = FSWCHR_ProcClose;
-
- pFileHandle = FindFileHandle(pFileName);
-
- if (pFileHandle)
- {
- if (pFileHandle->m_pFileName)
- {
- pFileHandle->SetName(NULL);
- HX_ASSERT(m_uCurrentChildCount > 0);
- m_uCurrentChildCount--;
- }
-
- retVal = CloseFileHandleObject(pFileHandle);
- }
- else
- {
- CloseDone(HXR_OK);
- }
- }
- }
- else
- {
- // This is a general closure (shutdown)
- // which need not be synchronous
- UINT16 i;
- FileHandle* pFileHandle;
-
- HX_ASSERT(m_pHandleTable);
-
- retVal = HXR_OK;
- m_bClosing = TRUE;
- m_CloseStatus = HXR_OK;
- HX_RELEASE(m_pResponse);
- m_pResponse = pResponse;
- pResponse->AddRef();
-
- if (m_State == FSWCHR_ProcClose)
- {
- // there is an additional outstanding Close to complete
- // for a child
- m_uCurrentChildCount++;
- }
-
- // Close Children
- HX_ASSERT(m_uCurrentChildCount <= m_uMaxChildCount);
-
- for (i = m_uCurrentChildCount, pFileHandle = m_pHandleTable + 1;
- i > 0;
- i--, pFileHandle++)
- {
- if (pFileHandle->m_pFileName)
- {
- pFileHandle->SetName(NULL);
-
- if (FAILED(CloseFileHandleObject(pFileHandle)))
- {
- // Recover by forcing the closing on this level
- CloseDone(HXR_OK);
- }
- }
- }
- // Close the root file
- if (FAILED(CloseFileHandleObject(m_pHandleTable)))
- {
- // Recover by forcing the closing on this level
- CloseDone(HXR_OK);
- }
- }
- }
- return retVal;
- }
- /****************************************************************************
- * IHXFileResponse methods
- */
- /****************************************************************************
- * InitDone
- */
- STDMETHODIMP CFileSwitcher::InitDone(HX_RESULT status)
- {
- HX_RESULT retVal = HXR_OK;
- if (m_State != FSWCHR_Offline)
- {
- if (m_State != FSWCHR_ProcInit)
- {
- HX_ASSERT(m_pCurrentHandle);
- HX_ASSERT(m_pCurrentHandle->m_pFileObject);
- // This must be initialization completion
- // as part of obtaining file handle during
- // Read, Write or Seek
- if (SUCCEEDED(status))
- {
- status = FileHandleReady();
- }
- if (FAILED(status))
- {
- m_pCurrentHandle->Clear();
- // Must report Failure to the requestor
- retVal = HandleFailureAsync(status);
- }
- }
- else
- {
- // Initialization complete
- IHXFileResponse* pResponse = m_pResponse;
- HX_ASSERT(pResponse);
- m_pResponse = NULL;
- if (SUCCEEDED(status))
- {
- m_State = FSWCHR_Ready;
- }
- retVal = pResponse->InitDone(status);
- pResponse->Release();
- }
- }
- else
- {
- retVal = HXR_UNEXPECTED;
- }
- return retVal;
- }
- /****************************************************************************
- * CloseDone
- */
- STDMETHODIMP CFileSwitcher::CloseDone(HX_RESULT status)
- {
- HX_RESULT retVal = HXR_UNEXPECTED;
- if (m_State != FSWCHR_Offline)
- {
- if (((m_State == FSWCHR_ProcRead) ||
- (m_State == FSWCHR_ProcWrite) ||
- (m_State == FSWCHR_ProcSeek) ||
- (m_State == FSWCHR_ProcAdvise)) &&
- (!m_bClosing))
- {
- // It must be a close due to freeing of a stale
- // file handle so we can create a new one
- retVal = HXR_OK;
- if (SUCCEEDED(status))
- {
- IHXGetFileFromSamePool* pFilePool;
-
- // Handle was made but needs set-up
- HX_ASSERT(m_pHandleTable->m_pFileObject);
-
- status = m_pHandleTable->m_pFileObject->QueryInterface(
- IID_IHXGetFileFromSamePool,
- (void**) &pFilePool);
-
- if (SUCCEEDED(status))
- {
- // Set-up is made by duplicating the root file object
- status = pFilePool->GetFileObjectFromPool(
- (IHXGetFileFromSamePoolResponse*) this);
- pFilePool->Release();
- }
- }
-
- if (FAILED(status))
- {
- retVal = HandleFailureAsync(status);
- }
- }
- else if ((m_State == FSWCHR_ProcClose) ||
- (m_bClosing))
- {
- retVal = HXR_OK;
- if (!m_bClosing || (m_uCurrentChildCount == 0))
- {
- // Close completion
- IHXFileResponse *pResponse = m_pResponse;
-
- m_pResponse = NULL;
- if (m_bClosing)
- {
- Reset();
- m_State = FSWCHR_Offline;
- if (FAILED(m_CloseStatus))
- {
- status = m_CloseStatus;
- }
- }
- else
- {
- m_State = FSWCHR_Ready;
- }
-
- if (pResponse)
- {
- retVal = pResponse->CloseDone(status);
- pResponse->Release();
- }
- }
- else
- {
- // Still Closing files
- m_uCurrentChildCount--;
- if (SUCCEEDED(m_CloseStatus))
- {
- m_CloseStatus = status;
- }
- }
- }
- }
- return retVal;
- }
- /****************************************************************************
- * ReadDone
- */
- STDMETHODIMP CFileSwitcher::ReadDone(HX_RESULT status,
- IHXBuffer* pBuffer)
- {
- HX_RESULT retVal = HXR_UNEXPECTED;
- if (m_State == FSWCHR_ProcRead)
- {
- HX_ASSERT(m_pResponse);
-
- if (m_ulChunkSize == m_ulSize)
- {
- IHXFileResponse *pResponse = m_pResponse;
- m_pResponse = NULL;
- m_State = FSWCHR_Ready;
- retVal = pResponse->ReadDone(status, pBuffer);
- pResponse->Release();
- }
- else
- {
- // The read of a fragment is completed
- // Initialize fragment buffer if just starting
- if (SUCCEEDED(status))
- {
- if (m_ulProcessedSize == 0)
- {
- // Starting the fragmented read -
- HX_ASSERT(m_pBuffer == NULL);
- HX_ASSERT(m_ulSize != 0);
-
- m_ulFragmentCount = 0;
- HX_RELEASE(m_pBuffer);
-
- status = m_pClassFactory->CreateInstance(
- IID_IHXBuffer,
- (void **) &m_pBuffer);
-
- if (SUCCEEDED(status))
- {
- status = m_pBuffer->SetSize(m_ulSize);
- if (FAILED(status))
- {
- HX_RELEASE(m_pBuffer);
- }
- }
- }
- }
- if (SUCCEEDED(status))
- {
- ULONG32 ulSize = pBuffer->GetSize();
- memcpy(m_pBuffer->GetBuffer() + m_ulProcessedSize, /* Flawfinder: ignore */
- pBuffer->GetBuffer(),
- ulSize);
- m_ulProcessedSize += ulSize;
- }
- if ((m_ulProcessedSize >= m_ulSize) || FAILED(status))
- {
- HX_ASSERT(m_ulProcessedSize <= m_ulSize);
- if (FAILED(status) && m_pBuffer)
- {
- if (m_ulProcessedSize != 0)
- {
- // Trim the buffer to what was read successfully
- m_pBuffer->SetSize(m_ulProcessedSize);
- status = HXR_OK;
- }
- else
- {
- HX_RELEASE(m_pBuffer);
- }
- }
- IHXBuffer* pBuffer = m_pBuffer;
- IHXFileResponse *pResponse = m_pResponse;
- m_pResponse = NULL;
- m_pBuffer = NULL;
- m_State = FSWCHR_Ready;
- retVal = pResponse->ReadDone(status, pBuffer);
- HX_RELEASE(pBuffer);
- pResponse->Release();
- }
- else
- {
- m_ulFragmentCount++;
- retVal = ReadNextFragment();
- }
- }
- }
- return retVal;
- }
- /****************************************************************************
- * WriteDone
- */
- STDMETHODIMP CFileSwitcher::WriteDone(HX_RESULT status)
- {
- HX_RESULT retVal = HXR_UNEXPECTED;
- if (m_State == FSWCHR_ProcWrite)
- {
- IHXFileResponse *pResponse = m_pResponse;
-
- HX_ASSERT(m_pResponse);
-
- m_pResponse = NULL;
- m_State = FSWCHR_Ready;
-
- retVal = pResponse->WriteDone(status);
-
- pResponse->Release();
- }
- return retVal;
- }
- /****************************************************************************
- * SeekDone
- */
- STDMETHODIMP CFileSwitcher::SeekDone(HX_RESULT status)
- {
- HX_RESULT retVal = HXR_UNEXPECTED;
- if (m_State == FSWCHR_ProcSeek)
- {
- IHXFileResponse *pResponse = m_pResponse;
-
- HX_ASSERT(m_pResponse);
-
- m_pResponse = NULL;
- m_State = FSWCHR_Ready;
-
- retVal = pResponse->SeekDone(status);
-
- pResponse->Release();
- }
- return retVal;
- }
- /****************************************************************************
- * IHXCallback methods
- */
- /****************************************************************************
- * Func
- */
- STDMETHODIMP CFileSwitcher::Func(void)
- {
- HX_RESULT retVal = HXR_UNEXPECTED;
- if (m_State == FSWCHR_ProcRead)
- {
- retVal = ReadNextFragment();
- }
- return retVal;
- }
- /****************************************************************************
- * IHXThreadSafeMethods method
- */
- /****************************************************************************
- * IsThreadSafe
- */
- STDMETHODIMP_(UINT32)
- CFileSwitcher::IsThreadSafe()
- {
- return HX_THREADSAFE_METHOD_FSR_READDONE;
- }
- /****************************************************************************
- * IHXGetFileFromSamePoolResponse method
- */
- /****************************************************************************
- * FileObjectReady
- */
- STDMETHODIMP CFileSwitcher::FileObjectReady(HX_RESULT status,
- IUnknown* pFileObject)
- {
- HX_RESULT retVal = HXR_UNEXPECTED;
- if (m_State != FSWCHR_Offline)
- {
- HX_ASSERT(m_pCurrentHandle);
- HX_ASSERT(m_pCurrentHandle->m_pFileName);
- HX_ASSERT(!m_pCurrentHandle->m_pFileObject);
-
- if (SUCCEEDED(status))
- {
- IHXRequestHandler* pRequestHandler = NULL;
- IHXRequest* pRequest = NULL;
- if (!m_bClosing)
- {
- status = pFileObject->QueryInterface(
- IID_IHXFileObject,
- (void **) &(m_pCurrentHandle->m_pFileObject));
- }
- else
- {
- status = HXR_ABORT;
- }
- if (status == HXR_OK)
- {
- status = m_pClassFactory->CreateInstance(
- IID_IHXRequest,
- (void **) &pRequest);
- }
-
- if (status == HXR_OK)
- {
- status = pRequest->SetURL(m_pCurrentHandle->m_pFileName);
- }
- if (status == HXR_OK)
- {
- status = pFileObject->QueryInterface(
- IID_IHXRequestHandler,
- (void**) &pRequestHandler);
- }
-
- if (status == HXR_OK)
- {
- status = pRequestHandler->SetRequest(pRequest);
- }
-
- HX_RELEASE(pRequest);
- HX_RELEASE(pRequestHandler);
-
- if (status == HXR_OK)
- {
- status = m_pCurrentHandle->m_pFileObject->Init
- (m_ulFlags,
- (IHXFileResponse*) this);
- }
- }
-
- if (status != HXR_OK)
- {
- retVal = HandleFailureAsync(status);
- }
- }
- return retVal;
- }
- /****************************************************************************
- * IUnknown methods
- */
- /////////////////////////////////////////////////////////////////////////
- // Method:
- // IUnknown::QueryInterface
- //
- STDMETHODIMP CFileSwitcher::QueryInterface(REFIID riid, void** ppvObj)
- {
- if (IsEqualIID(riid, IID_IHXFileSwitcher))
- {
- AddRef();
- *ppvObj = (IHXFileSwitcher*) this;
- return HXR_OK;
- }
- else if (IsEqualIID(riid, IID_IHXCallback))
- {
- AddRef();
- *ppvObj = (IHXCallback*)this;
- return HXR_OK;
- }
- else if (IsEqualIID(riid, IID_IHXGetFileFromSamePoolResponse))
- {
- AddRef();
- *ppvObj = (IHXGetFileFromSamePoolResponse*) this;
- return HXR_OK;
- }
- else if (IsEqualIID(riid, IID_IHXFileResponse))
- {
- AddRef();
- *ppvObj = (IHXFileResponse*) this;
- return HXR_OK;
- }
- else if (IsEqualIID(riid, IID_IUnknown))
- {
- AddRef();
- *ppvObj = this;
- return HXR_OK;
- }
- else if (IsEqualIID(riid, IID_IHXThreadSafeMethods))
- {
- AddRef();
- *ppvObj = (IHXThreadSafeMethods*) this;
- return HXR_OK;
- }
- *ppvObj = NULL;
- return HXR_NOINTERFACE;
- }
- /////////////////////////////////////////////////////////////////////////
- // Method:
- // IUnknown::AddRef
- //
- STDMETHODIMP_(ULONG32) CFileSwitcher::AddRef()
- {
- return InterlockedIncrement(&m_lRefCount);
- }
- /////////////////////////////////////////////////////////////////////////
- // Method:
- // IUnknown::Release
- //
- STDMETHODIMP_(ULONG32) CFileSwitcher::Release()
- {
- if (InterlockedDecrement(&m_lRefCount) > 0)
- {
- return m_lRefCount;
- }
- delete this;
- return 0;
- }