hxdllldr.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 
 * 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 ***** */ 

#include "hxtypes.h"
#include "hlxclib/windows.h"
#include "hxstrutl.h"
#include "hxdllldr.h"

LPHXDLLNode	g_pHXDLLListHead = NULL;
LPHXDLLNode	g_pHXDLLListTail = NULL;

HINSTANCE
HXLoadLibrary(const char* pszDLL)
{
    char*	    pszName = NULL;
    HINSTANCE	    hLib = NULL;
    LPHXDLLNode    pDLLNode = NULL;

    if (!pszDLL)
    {
	goto cleanup;
    }

    pDLLNode = g_pHXDLLListHead;
    while (pDLLNode)
    {
	if (!strcasecmp(pDLLNode->pszName, pszDLL))
	{
	    hLib = pDLLNode->hLib;
	    break;
	}

	pDLLNode = (LPHXDLLNode)pDLLNode->next;
    }

    if (!hLib)
    {
    	hLib = LoadLibrary(OS_STRING(pszDLL));

	if (hLib)
	{
	    pszName = new char[strlen(pszDLL) + 1];
	    strcpy(pszName, pszDLL); /* Flawfinder: ignore */

	    pDLLNode = new HXDLLNode;
	    
	    pDLLNode->pszName = pszName;
	    pDLLNode->hLib = hLib;
	    pDLLNode->next = NULL;

	    if (!g_pHXDLLListHead)
	    {
		g_pHXDLLListHead = pDLLNode;
		g_pHXDLLListTail = g_pHXDLLListHead;
	    }
	    else
	    {
		g_pHXDLLListTail->next = pDLLNode;
		g_pHXDLLListTail = pDLLNode;
	    }
	}
    }

cleanup:

    return hLib;
}

void
HXFreeLibrary(const char* pszDLL)
{
    // no-op
    // actual FreeLibrary() in Close()
}

void
HXCloseLibrary(void)
{
    HINSTANCE	    hLib = NULL;
    LPHXDLLNode    pDLLNode = NULL;

    pDLLNode = g_pHXDLLListHead;
    while (pDLLNode)
    {
	g_pHXDLLListHead = (LPHXDLLNode)pDLLNode->next;

	HX_VECTOR_DELETE(pDLLNode->pszName);
	FreeLibrary(pDLLNode->hLib);
	HX_DELETE(pDLLNode);

	pDLLNode = g_pHXDLLListHead; 
    }

    g_pHXDLLListHead = NULL;
    g_pHXDLLListTail = NULL;

    return;
}