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cachobj.cpp：源码内容
							/* ***** 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. 
 * 
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 *    http://www.helixcommunity.org/content/tck 
 * 
 * Contributor(s): 
 *  
 * ***** END LICENSE BLOCK ***** */ 
/****************************************************************************
 * 
 *  cachobj.cpp
 *
 *  Purpose:
 *	To cache objects in a temporary storage for later retrieval
 *	Can be created off of IHXCommonClassFactory.
 *	Currently supported only on the client side.
 *
 */
#include "hxcom.h"
#include "hxtypes.h"
#include "hxresult.h"
#include "hxguid.h"
#include "timeval.h"
#include "basepkt.h"
#include "hxbuffer.h"
#include "timebuff.h"
#include "hxcache.h"
#include "ihxpckts.h"
#include "hxtbuf.h"
#include "chunkres.h"
#include "cachobj.h"
#include "hxheap.h"
#ifdef _DEBUG
#undef HX_THIS_FILE		
static const char HX_THIS_FILE[] = __FILE__;
#endif
// HXFIFOCache...
HXFIFOCache::HXFIFOCache() :
      m_lRefCount(0)
    , m_pChunkyRes(NULL)
    , m_ulCurrentReadPosition(0)
    , m_ulCurrentWritePosition(0)
{
}
HXFIFOCache::~HXFIFOCache()
{
    Flush();
}
/*
 * IUnknown methods
 */
/////////////////////////////////////////////////////////////////////////
//	Method:
//		IUnknown::QueryInterface
//	Purpose:
//		Implement this to export the interfaces supported by your 
//		object.
//
STDMETHODIMP HXFIFOCache::QueryInterface(REFIID riid, void** ppvObj)
{
	QInterfaceList qiList[] =
	{
		{ GET_IIDHANDLE(IID_IUnknown), this },
		{ GET_IIDHANDLE(IID_IHXFIFOCache), (IHXFIFOCache*) this },
	};	
    return QIFind(qiList, QILISTSIZE(qiList), riid, ppvObj);   
}
/////////////////////////////////////////////////////////////////////////
//	Method:
//		IUnknown::AddRef
//	Purpose:
//		Everyone usually implements this the same... feel free to use
//		this implementation.
//
STDMETHODIMP_(ULONG32) HXFIFOCache::AddRef()
{
    return InterlockedIncrement(&m_lRefCount);
}
/////////////////////////////////////////////////////////////////////////
//	Method:
//		IUnknown::Release
//	Purpose:
//		Everyone usually implements this the same... feel free to use
//		this implementation.
//
STDMETHODIMP_(ULONG32) HXFIFOCache::Release()
{
    if (InterlockedDecrement(&m_lRefCount) > 0)
    {
	return m_lRefCount;
    }
    delete this;
    return 0;
}
/************************************************************************
 *	Method:
 *		IHXFIFOCache::Cache
 *	Purpose:
 *	    To cache objects in a temporary storage for later retrieval
 *
 *	    Currently supported objects:
 *		IHXBuffer
 *		IHXValues
 *		IHXPacket
// $Private:
 *		IHXTimeStampedBuffer
// $EndPrivate.
 *
 */
STDMETHODIMP HXFIFOCache::Cache(IUnknown*	    pObject)
{
    HX_RESULT		    theErr = HXR_UNEXPECTED;
    IHXClientPacket*	    pClientPacket = NULL;
    IHXTimeStampedBuffer*  pTimeStampBuffer = NULL;
    IHXBuffer*		    pBuffer = NULL;
    IHXPacket*		    pPacket = NULL;
    IHXValues*		    pValues = NULL;
    if (!m_pChunkyRes)
    {
	m_pChunkyRes = new CChunkyRes;
    }
    if (pObject->QueryInterface(IID_IHXClientPacket, (void**) &pClientPacket) == HXR_OK)
    {
	theErr = CacheClientPacket(pClientPacket);
	pClientPacket->Release();
    }
    else if (pObject->QueryInterface(IID_IHXTimeStampedBuffer, (void**) &pTimeStampBuffer) == HXR_OK)
    {
	theErr = CacheTimestampBuffer(pTimeStampBuffer);
	pTimeStampBuffer->Release();
    }
    else if (pObject->QueryInterface(IID_IHXBuffer, (void**) &pBuffer) == HXR_OK)
    {
	theErr = CacheBuffer(pBuffer);
	pBuffer->Release();
    }
    else if (pObject->QueryInterface(IID_IHXPacket, (void**) &pPacket) == HXR_OK)
    {
	theErr = CachePacket(pPacket);
	pPacket->Release();
    }
    else if (pObject->QueryInterface(IID_IHXValues, (void**) &pValues) == HXR_OK)
    {
	theErr = CacheValues(pValues);
	pValues->Release();
    }
    return theErr;
}
/************************************************************************
 *	Method:
 *	    IHXFIFOCache::Retrieve
 *	Purpose:
 *
 *
 */
STDMETHODIMP HXFIFOCache::Retrieve(REF(IUnknown*)  pObject)
{
    HX_RESULT		theErr = HXR_OK;
    UINT32		ulBytesRead = 0;
    UINT32		ulBytesToRead = 0;
    char*		pData = NULL;
    char*		pCursor = NULL;
    CHXBuffer*		pBuffer = NULL;
    ChunkyCacheLayout*	pChunkyCacheLayout = NULL;
    if (!m_pChunkyRes)
    {
	theErr = HXR_UNEXPECTED;
	goto cleanup;
    }
    pObject = NULL;
    
    pChunkyCacheLayout = new ChunkyCacheLayout;
    ulBytesToRead = sizeof(ChunkyCacheLayout);
    // read Chunk Header Info
    m_pChunkyRes->GetData(m_ulCurrentReadPosition,
			  (char*)pChunkyCacheLayout,
			  ulBytesToRead,
			  &ulBytesRead);
    m_ulCurrentReadPosition += ulBytesRead;
    if (ulBytesRead)
    {
	HX_ASSERT(ulBytesToRead == ulBytesRead);	
	ulBytesToRead = pChunkyCacheLayout->size - ulBytesRead;
	pData = new char[ulBytesToRead];
	
	// read the Chunk Data
	m_pChunkyRes->GetData(m_ulCurrentReadPosition,
			      (char*)pData,
			      ulBytesToRead,
			      &ulBytesRead);
	HX_ASSERT(ulBytesToRead == ulBytesRead);
	m_ulCurrentReadPosition += ulBytesRead;
	pCursor = pData;
	if (::IsEqualGUID(IID_IHXClientPacket, pChunkyCacheLayout->guid)) 
	{	    	    
	    ClientPacket::UnPack((IHXClientPacket*&)pObject, pCursor, ulBytesRead);
	}
	else if (::IsEqualGUID(IID_IHXPacket, pChunkyCacheLayout->guid))
	{
	    CHXPacket::UnPack((IHXPacket*&)pObject, pCursor, ulBytesRead);
	}
	else if (::IsEqualGUID(IID_IHXTimeStampedBuffer, pChunkyCacheLayout->guid))
	{
	    CHXTimeStampedBuffer::UnPack((IHXTimeStampedBuffer*&)pObject, pCursor, ulBytesRead);
	}
	else if (::IsEqualGUID(IID_IHXBuffer, pChunkyCacheLayout->guid))
	{
	    pBuffer = new CHXBuffer();
	    pBuffer->Set((const UCHAR*)pCursor, ulBytesRead);
	    pBuffer->QueryInterface(IID_IHXBuffer, (void**)&pObject);
	}
	else
	{
	    theErr = HXR_NOTIMPL;
	}
    }
cleanup:
    HX_DELETE(pChunkyCacheLayout);
    HX_VECTOR_DELETE(pData);
    
    return theErr;
}
/************************************************************************
 *	Method:
 *	    IHXFIFOCache::Flush
 *	Purpose:
 *
 *
 */
STDMETHODIMP HXFIFOCache::Flush(void)
{
    m_ulCurrentReadPosition	= 0;
    m_ulCurrentWritePosition	= 0;
    HX_DELETE(m_pChunkyRes);
    return HXR_OK;
}
HX_RESULT 
HXFIFOCache::CacheClientPacket(IHXClientPacket* pClientPacket)
{
    HX_RESULT	theErr = HXR_OK;
    BOOL	bContiguousDataPointer = FALSE;
    UINT32	ulBytesWrote = 0;
    UINT32	ulBytesToWrite = 0;
    char*	pData = NULL;
    char*	pCursor = NULL;
#if !defined(HELIX_FEATURE_FULLGUID)
    GUID	tmp = IID_IHXClientPacket;
#endif
    if (!pClientPacket)
    {
	theErr = HXR_FAILED;
	goto cleanup;
    }
    // caculate the size of client packet
    ClientPacket::Pack(pClientPacket, NULL, ulBytesToWrite);
    ulBytesToWrite += sizeof(ChunkyCacheLayout);
    // check whether we have cont. memory chunk of the size needed
    if (HXR_OK == m_pChunkyRes->GetContiguousDataPointer(m_ulCurrentWritePosition,
							 pData,
							 ulBytesToWrite) && pData)
    {	
	bContiguousDataPointer = TRUE;
	pCursor = pData;
    }
    // otherwise we allocated our own
    else
    {
	pData = new char[ulBytesToWrite];
	pCursor = pData;
    }
    // total chunk bytes
    *pCursor++ = (BYTE)ulBytesToWrite; *pCursor++ = (BYTE)(ulBytesToWrite >> 8);
    ulBytesWrote += 2;
    // GUID
#if !defined(HELIX_FEATURE_FULLGUID)
    memcpy(pCursor, (char*)&tmp, sizeof(GUID)); /* Flawfinder: ignore */
#else
    memcpy(pCursor, (char*)&IID_IHXClientPacket, sizeof(GUID)); /* Flawfinder: ignore */
#endif
    pCursor += sizeof(GUID);
    ulBytesWrote += sizeof(GUID);
    // pack data
    ClientPacket::Pack(pClientPacket, pCursor, ulBytesWrote);	
    if (!bContiguousDataPointer)
    {
	// let the memory manager take care of the contingency
	theErr = m_pChunkyRes->SetData(m_ulCurrentWritePosition, pData, ulBytesWrote);
    }
    HX_ASSERT(ulBytesToWrite == ulBytesWrote);
    // advance the write cursor
    m_ulCurrentWritePosition += ulBytesToWrite;
cleanup:
    if (!bContiguousDataPointer)
    {
	HX_VECTOR_DELETE(pData);
    }
    return theErr;
}
HX_RESULT 
HXFIFOCache::CacheTimestampBuffer(IHXTimeStampedBuffer* pTimeStampBuffer)
{
    HX_RESULT	theErr = HXR_OK;
    BOOL	bContiguousDataPointer = FALSE;
    UINT32	ulBytesWrote = 0;
    UINT32	ulBytesToWrite = 0;
    char*	pData = NULL;
    char*	pCursor = NULL;
#if !defined(HELIX_FEATURE_FULLGUID)
    GUID	tmp = IID_IHXBuffer;
#endif
    if (!pTimeStampBuffer)
    {
	theErr = HXR_FAILED;
	goto cleanup;
    }
    // caculate the size of buffer
    CHXTimeStampedBuffer::Pack(pTimeStampBuffer, NULL, 0, ulBytesToWrite);
    ulBytesToWrite += sizeof(ChunkyCacheLayout);
    // check whether we have cont. memory chunk of the size needed
    if (HXR_OK == m_pChunkyRes->GetContiguousDataPointer(m_ulCurrentWritePosition,
							 pData,
							 ulBytesToWrite) && pData)
    {	
	bContiguousDataPointer = TRUE;
	pCursor = pData;
    }
    // otherwise we allocated our own
    else
    {
	pData = new char[ulBytesToWrite];
	pCursor = pData;
    }
    // total chunk bytes
    *pCursor++ = (BYTE)ulBytesToWrite; *pCursor++ = (BYTE)(ulBytesToWrite >> 8);
    ulBytesWrote += 2;
    // GUID
#if !defined(HELIX_FEATURE_FULLGUID)
    memcpy(pCursor, (char*)&tmp, sizeof(GUID)); /* Flawfinder: ignore */
#else
    memcpy(pCursor, (char*)&IID_IHXBuffer, sizeof(GUID)); /* Flawfinder: ignore */
#endif
    pCursor += sizeof(GUID);
    ulBytesWrote += sizeof(GUID);
    // pack data
    CHXTimeStampedBuffer::Pack(pTimeStampBuffer, pCursor,
                               ulBytesToWrite - ulBytesWrote, ulBytesWrote);	
    if (!bContiguousDataPointer)
    {
	// let the memory manager take care of the contingency
	theErr = m_pChunkyRes->SetData(m_ulCurrentWritePosition, pData, ulBytesWrote);
    }
    HX_ASSERT(ulBytesToWrite == ulBytesWrote);
    // advance the write cursor
    m_ulCurrentWritePosition += ulBytesToWrite;
cleanup:
    if (!bContiguousDataPointer)
    {
	HX_VECTOR_DELETE(pData);
    }
    return theErr;
}
HX_RESULT 
HXFIFOCache::CacheBuffer(IHXBuffer* pBuffer)
{
    HX_RESULT	theErr = HXR_OK;
    BOOL	bContiguousDataPointer = FALSE;
    UINT32	ulBytesWrote = 0;
    UINT32	ulBytesToWrite = 0;
    char*	pData = NULL;
    char*	pCursor = NULL;
#if !defined(HELIX_FEATURE_FULLGUID)
    GUID	tmp = IID_IHXBuffer;
#endif
    if (!pBuffer)
    {
	theErr = HXR_FAILED;
	goto cleanup;
    }
    // caculate the size of client packet
    ulBytesToWrite = pBuffer->GetSize();
    ulBytesToWrite += sizeof(ChunkyCacheLayout);
    // check whether we have cont. memory chunk of the size needed
    if (HXR_OK == m_pChunkyRes->GetContiguousDataPointer(m_ulCurrentWritePosition,
							 pData,
							 ulBytesToWrite) && pData)
    {	
	bContiguousDataPointer = TRUE;
	pCursor = pData;
    }
    // otherwise we allocated our own
    else
    {
	pData = new char[ulBytesToWrite];
	pCursor = pData;
    }
    // total chunk bytes
    *pCursor++ = (BYTE)ulBytesToWrite; *pCursor++ = (BYTE)(ulBytesToWrite >> 8);
    ulBytesWrote += 2;
    // GUID
#if !defined(HELIX_FEATURE_FULLGUID)
    memcpy(pCursor, (char*)&tmp, sizeof(GUID)); /* Flawfinder: ignore */
#else
    memcpy(pCursor, (char*)&IID_IHXBuffer, sizeof(GUID)); /* Flawfinder: ignore */
#endif
    pCursor += sizeof(GUID);
    ulBytesWrote += sizeof(GUID);
    // pack data
    memcpy(pCursor, (char*)pBuffer->GetBuffer(), pBuffer->GetSize()); /* Flawfinder: ignore */
    if (!bContiguousDataPointer)
    {
	// let the memory manager take care of the contingency
	theErr = m_pChunkyRes->SetData(m_ulCurrentWritePosition, pData, ulBytesWrote);
    }
    HX_ASSERT(ulBytesToWrite == ulBytesWrote);
    // advance the write cursor
    m_ulCurrentWritePosition += ulBytesToWrite;
cleanup:
    if (!bContiguousDataPointer)
    {
	HX_VECTOR_DELETE(pData);
    }
    return theErr;
}
HX_RESULT 
HXFIFOCache::CachePacket(IHXPacket* pPacket)
{
    HX_RESULT	theErr = HXR_OK;
    BOOL	bContiguousDataPointer = FALSE;
    UINT32	ulBytesWrote = 0;
    UINT32	ulBytesToWrite = 0;
    char*	pData = NULL;
    char*	pCursor = NULL;
#if !defined(HELIX_FEATURE_FULLGUID)
    GUID	tmp = IID_IHXPacket;
#endif
    if (!pPacket)
    {
	theErr = HXR_FAILED;
	goto cleanup;
    }
    // caculate the size of client packet
    CHXPacket::Pack(pPacket, NULL, ulBytesToWrite);
    ulBytesToWrite += sizeof(ChunkyCacheLayout);
    // check whether we have cont. memory chunk of the size needed
    if (HXR_OK == m_pChunkyRes->GetContiguousDataPointer(m_ulCurrentWritePosition,
							 pData,
							 ulBytesToWrite) && pData)
    {	
	bContiguousDataPointer = TRUE;
	pCursor = pData;
    }
    // otherwise we allocated our own
    else
    {
	pData = new char[ulBytesToWrite];
	pCursor = pData;
    }
    // total chunk bytes
    *pCursor++ = (BYTE)ulBytesToWrite; *pCursor++ = (BYTE)(ulBytesToWrite >> 8);
    ulBytesWrote += 2;
    // GUID
#if !defined(HELIX_FEATURE_FULLGUID)
    memcpy(pCursor, (char*)&tmp, sizeof(GUID)); /* Flawfinder: ignore */
#else
    memcpy(pCursor, (char*)&IID_IHXPacket, sizeof(GUID)); /* Flawfinder: ignore */
#endif
    pCursor += sizeof(GUID);
    ulBytesWrote += sizeof(GUID);
    // pack data
    CHXPacket::Pack(pPacket, pCursor, ulBytesWrote);	
    if (!bContiguousDataPointer)
    {
	// let the memory manager take care of the contingency
	theErr = m_pChunkyRes->SetData(m_ulCurrentWritePosition, pData, ulBytesWrote);
    }
    HX_ASSERT(ulBytesToWrite == ulBytesWrote);
    // advance the write cursor
    m_ulCurrentWritePosition += ulBytesToWrite;
cleanup:
    if (!bContiguousDataPointer)
    {
	HX_VECTOR_DELETE(pData);
    }
    return theErr;
}
HX_RESULT 
HXFIFOCache::CacheValues(IHXValues* pValues)
{
    // TBD
    HX_RESULT theErr = HXR_NOTIMPL;
    return theErr;
}

						