hxdllldr.cpp

linux下的一款播放器

/* ***** BEGIN LICENSE BLOCK *****
 * Source last modified: $Id: hxdllldr.cpp,v 1.2.42.3 2004/07/09 01:43:33 hubbe Exp $
 * 
 * Portions Copyright (c) 1995-2004 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 (the "RPSL") available at
 * http://www.helixcommunity.org/content/rpsl unless you have licensed
 * the file under the current version of the RealNetworks Community
 * Source License (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.
 * 
 * Alternatively, the contents of this file may be used under the
 * terms of the GNU General Public License Version 2 or later (the
 * "GPL") in which case the provisions of the GPL are applicable
 * instead of those above. If you wish to allow use of your version of
 * this file only under the terms of the GPL, and not to allow others
 * to use your version of this file under the terms of either the RPSL
 * or RCSL, indicate your decision by deleting the provisions above
 * and replace them with the notice and other provisions required by
 * the GPL. If you do not delete the provisions above, a recipient may
 * use your version of this file under the terms of any one of the
 * RPSL, the RCSL or the GPL.
 * 
 * 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;
}