symbian_dll_map.cpp

著名的 helix realplayer 基于手机 symbian 系统的 播放器全套源代码

/* ***** 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 
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 * Version 1.0 (the "RPSL") available at 
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 * 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 
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 * 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. 
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 * This file, and the files included with this file, is distributed and made 
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#include "platform/symbian/symbian_dll_map.h"
#include "hxassert.h"

class DLLMapInfo
{
public:
    DLLMapInfo(void* pEntryPoint);
    ~DLLMapInfo();
    void* EntryPoint() const { return m_pEntryPoint;}
    void OnLoad() {m_ulCount++;}
    BOOL OnUnload();

private:
    void DoCleanup();

    void* m_pEntryPoint;
    UINT32 m_ulCount;
};

DLLMapInfo::DLLMapInfo(void* pEntryPoint) :
    m_pEntryPoint(pEntryPoint),
    m_ulCount(0)
{}

DLLMapInfo::~DLLMapInfo()
{
    if (m_ulCount != 0)
    {
	DoCleanup();
    }
}

BOOL DLLMapInfo::OnUnload()
{
    BOOL bRet = FALSE;

    HX_ASSERT(m_ulCount);

    if (m_ulCount > 0)
    {
	m_ulCount--;

	if (m_ulCount == 0)
	{
	    DoCleanup();
	    bRet = TRUE;
	}
    }

    return bRet;
}

void DLLMapInfo::DoCleanup()
{
#ifdef _ARM
    // Make the device behave like the emulator.
    // The emulator calls E32Dll(EDllProcessDetach) when 
    // Close() is called on the library handle. This does
    // not occur on the device so we've added this code
    // to do it.
    TLibraryEntry pEntry = (TLibraryEntry)m_pEntryPoint;
    
    if (pEntry)
    {
	pEntry(EDllProcessDetach);
    }
#endif
}

SymbianDLLMapImp::SymbianDLLMapImp()
{}

SymbianDLLMapImp::~SymbianDLLMapImp()
{
    HX_ASSERT(m_libList.IsEmpty());

    while(!m_libList.IsEmpty())
    {
	DLLMapInfo* pTmp = (DLLMapInfo*)m_libList.RemoveHead();

	HX_DELETE(pTmp);
    }
}

void SymbianDLLMapImp::OnLoad(void* pDLLEntryPoint)
{
    DLLMapInfo* pInfo = FindInfo(pDLLEntryPoint);

    if (!pInfo)
    {
	pInfo = new DLLMapInfo(pDLLEntryPoint);

	if (pInfo && !m_libList.AddHead(pInfo))
	{
	    // The AddHead() failed
	    HX_DELETE(pInfo);
	}
    }

    if (pInfo)
    {
	pInfo->OnLoad();
    }
}

void SymbianDLLMapImp::OnUnload(void* pDLLEntryPoint)
{
    DLLMapInfo* pInfo = FindInfo(pDLLEntryPoint);

    HX_ASSERT(pInfo);
    if (pInfo)
    {
	if (pInfo->OnUnload())
	{
	    // This was the last unload for this DLL.
	    // Remove it from our list and destroy the info
	    
	    LISTPOSITION pos = m_libList.GetHeadPosition();
	    while(pInfo && pos)
	    {
		if (pInfo == (DLLMapInfo*)m_libList.GetAt(pos))
		{
		    m_libList.RemoveAt(pos);
		    HX_DELETE(pInfo);
		}
		else
		{
		    m_libList.GetNext(pos);
		}
	    }
	}
    }
}

DLLMapInfo* SymbianDLLMapImp::FindInfo(void* pDLLEntryPoint)
{
    DLLMapInfo* pRet = NULL;

    CHXSimpleList::Iterator itr = m_libList.Begin();

    for(; !pRet && (itr != m_libList.End()); ++itr)
    {
	DLLMapInfo* pTmp = (DLLMapInfo*)*itr;

	if (pTmp && (pTmp->EntryPoint() == pDLLEntryPoint))
	{
	    pRet = pTmp;
	}
    }
    return pRet;
}