datafsys.h

linux下的一款播放器

/* ***** BEGIN LICENSE BLOCK *****
 * Source last modified: $Id: datafsys.h,v 1.1.1.1.38.1 2004/07/09 02:03:41 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 ***** */

#ifndef _DATAFSYS_H_
#define _DATAFSYS_H_

class DataFileSystem : public IHXPlugin, 
                         public IHXFileSystemObject
{
public:
    static HX_RESULT STDAPICALLTYPE HXCreateInstance(IUnknown** ppIUnknown);
    static HX_RESULT CanUnload();
    static HX_RESULT STDAPICALLTYPE HXShutdown(void);

    DataFileSystem();

    ~DataFileSystem();

    // *** IUnknown methods ***
    STDMETHOD(QueryInterface)	(THIS_
    	    	    	    	REFIID riid,
    	    	    	    	void** ppvObj);

    STDMETHOD_(ULONG32,AddRef)	(THIS);

    STDMETHOD_(ULONG32,Release)	(THIS);

    // *** IHXPlugin methods ***

    /************************************************************************
     *	Method:
     *	    IHXPlugin::GetPluginInfo
     *	Purpose:
     *	    Returns the basic information about this plugin. Including:
     *
     *	    bLoadMultiple	whether or not this plugin DLL can be loaded
     *				multiple times. All File Formats must set
     *				this value to TRUE.
     *	    pDescription	which is used in about UIs (can be NULL)
     *	    pCopyright		which is used in about UIs (can be NULL)
     *	    pMoreInfoURL	which is used in about UIs (can be NULL)
     */
    STDMETHOD(GetPluginInfo)	(THIS_
				REF(BOOL)        /*OUT*/ bLoadMultiple,
				REF(const char*) /*OUT*/ pDescription,
				REF(const char*) /*OUT*/ pCopyright,
				REF(const char*) /*OUT*/ pMoreInfoURL,
				REF(ULONG32)	 /*OUT*/ ulVersionNumber
				);

    /************************************************************************
     *	Method:
     *	    IHXPlugin::InitPlugin
     *	Purpose:
     *	    Initializes the plugin for use. This interface must always be
     *	    called before any other method is called. This is primarily needed 
     *	    so that the plugin can have access to the context for creation of
     *	    IHXBuffers and IMalloc.
     */
    STDMETHOD(InitPlugin)   (THIS_
			    IUnknown*   /*IN*/  pContext);

    // *** IHXFileSystemObject methods ***
    STDMETHOD(GetFileSystemInfo)    (THIS_
				    REF(const char*) /*OUT*/ pShortName,
				    REF(const char*) /*OUT*/ pProtocol);

    STDMETHOD(InitFileSystem) (THIS_ IHXValues* options);

    STDMETHOD(CreateFile)	(THIS_
				IUnknown**    /*OUT*/	ppFileObject);

    STDMETHOD(CreateDir)        (THIS_
                                IUnknown**     /*OUT*/     ppDirObject);

private:
    LONG32			m_lRefCount;
    static const IID            zm_myIID;
    static const char*          zm_pDescription;
    static const char*          zm_pCopyright;
    static const char*          zm_pMoreInfoURL;
    static const char*		zm_pShortName;
    static const char*		zm_pProtocol;
    IUnknown*			m_pContext;
};

/////////////////////////////////////////////////////////////////////////////
// 
//  Class:
//
//  	DataFileObject
//
//  Purpose:
//
//  	File object to handle Data functions
//

class DataFileObject : public IHXFileObject, 
                         public IHXFileStat,
                         public IHXFileExists,
                         public IHXRequestHandler,
			 public IHXFileMimeMapper
{
public:
    DataFileObject(IUnknown* pContext);
    ~DataFileObject();

    /*
     *	IUnknown methods
     */

    STDMETHOD(QueryInterface)	(THIS_
    	    	    	    	REFIID riid,
    	    	    	    	void** ppvObj);

    STDMETHOD_(ULONG32,AddRef)	(THIS);

    STDMETHOD_(ULONG32,Release)	(THIS);

    /*
     *	IHXFileObject methods
     */

    /************************************************************************
     *	Method:
     *	    IHXFileObject::Init
     *	Purpose:
     *	    Associates a file object with the file response object it should
     *	    notify of operation completness. This method should also check
     *	    for validity of the object (for example by opening it if it is
     *	    a local file).
     */
    STDMETHOD(Init)		(THIS_
				ULONG32		    /*IN*/	ulFlags,
				IHXFileResponse*   /*IN*/	pFileResponse);

    /************************************************************************
     *  Method:
     *      IHXFileObject::GetFilename
     *  Purpose:
     *      Returns the filename (without any path information) associated
     *      with a file object.
     */
    STDMETHOD(GetFilename)      (THIS_
				REF(const char*)    /*OUT*/  pFilename);

    /************************************************************************
     *	Method:
     *	    IHXFileObject::Close
     *	Purpose:
     *	    Closes the file resource and releases all resources associated
     *	    with the object.
     */
    STDMETHOD(Close)	    	(THIS);

    /************************************************************************
     *	Method:
     *	    IHXFileObject::Read
     *	Purpose:
     *	    Reads a buffer of data of the specified length from the file
     *	    and asynchronously returns it to the caller via the 
     *	    IHXFileResponse interface passed in to Init.
     */
    STDMETHOD(Read)		(THIS_
    	    	    	    	ULONG32	    	    ulCount);

    /************************************************************************
     *	Method:
     *	    IHXFileObject::Write
     *	Purpose:
     *	    Writes a buffer of data to the file and asynchronously notifies
     *	    the caller via the IHXFileResponse interface passed in to Init,
     *	    of the completeness of the operation.
     */
    STDMETHOD(Write)	    	(THIS_
    	    	    	    	IHXBuffer*	    pBuffer);

    /************************************************************************
     *	Method:
     *	    IHXFileObject::Seek
     *	Purpose:
     *	    Seeks to an offset in the file and asynchronously notifies
     *	    the caller via the IHXFileResponse interface passed in to Init,
     *	    of the completeness of the operation.
     */
    STDMETHOD(Seek)		(THIS_
    	    	    	    	 ULONG32	    ulOffset,
				 BOOL               bRelative);

    /************************************************************************
     *	Method:
     *	    IHXFileObject::Stat
     *	Purpose:
     *	    Collects information about the file that is returned to the
     *      caller in an IHXStat object
     */
    STDMETHOD(Stat)		(THIS_
				IHXFileStatResponse* pFileStatResponse);

    /************************************************************************
     *	Method:
     *	    IHXFileObject::Advise
     *	Purpose:
     *      To pass information to the File Object
     */
    STDMETHOD(Advise)	(THIS_
			ULONG32 ulInfo);

    // IHXFileExists interface
    /************************************************************************
     *	Method:
     *	    IHXFileExists::DoesExist
     *	Purpose:
     */
    STDMETHOD(DoesExist) (THIS_
			const char*		/*IN*/  pPath, 
			IHXFileExistsResponse* /*IN*/  pFileResponse);

    //IHXRequestHandler methods
    /************************************************************************
     *	Method:
     *	    IHXRequestHandler::SetRequest
     *	Purpose:
     *	    Associates an IHXRequest with an object
     */
    STDMETHOD(SetRequest)   	(THIS_
			    	IHXRequest*        /*IN*/  pRequest);

    /************************************************************************
     *	Method:
     *	    IHXRequestHandler::GetRequest
     *	Purpose:
     *	    Gets the IHXRequest object associated with an object
     */
    STDMETHOD(GetRequest)   	(THIS_
			    	REF(IHXRequest*)  /*OUT*/  pRequest);

    /*
     *	IHXFileMimeMapper methods
     */

    /************************************************************************
     *	Method:
     *	    IHXFileMimeMapper::FindMimeType
     *	Purpose:
     */
    STDMETHOD(FindMimeType) (THIS_
			    const char*		    /*IN*/  pURL, 
			    IHXFileMimeMapperResponse* /*IN*/  pMimeMapperResponse
			    );


private:
    LONG32			m_lRefCount;
    IUnknown*			m_pContext;
    IHXCommonClassFactory*	m_pClassFactory;
    IHXFileResponse*		m_pFileResponse;
    IHXRequest*		m_pRequest;
    IHXBuffer*			m_pDataURL;
    CHXString			m_MediaType;
    UINT32			m_ulFilePointer;

    STDMETHOD(ParseURL)(THIS_ const char* pURL, CHXString& mimeString, 
	IHXBuffer* pData);
};

#endif // ndef _DATAFSYS_H_