symbihxdataf.h

linux下的一款播放器

/* ***** BEGIN LICENSE BLOCK *****
 * Source last modified: $Id: symbihxdataf.h,v 1.3.42.3 2004/07/09 01:44:20 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 _SYMBIHXDATAF_H_
#define	_SYMBIHXDATAF_H_

/************************************************************************
 *  Includes
 */
#include "hxcom.h"
#include "hxdataf.h"

#include "ihxsymbfsessionmgr.h"


/************************************************************************
 *  CIHX2CHXDataFile
 */
class CSymbIHXDataFile : public IHXAsyncDataFile
{
public:
	/*
	 *  Constructor
	 */
	CSymbIHXDataFile(IUnknown** ppCommonObj = NULL);

	/*
	 *  IHXDataFile methods
	 */
	/* Bind DataFile Object with FileName */
	STDMETHOD_(void, Bind)		(THIS_
					const char* FileName);
	
	/* Creates a datafile using the specified mode
	 * uOpenMode --- File Open mode - HX_FILE_READ/HX_FILE_WRITE/HX_FILE_BINARY
	 */
	STDMETHOD(Create)		(THIS_
					UINT16 uOpenMode);
	
	/* Open will open a file with the specified mode
	 */
	STDMETHOD(Open)			(THIS_
					UINT16 uOpenMode);
	
	/* Close closes a file 
	 * If the reference count on the IHXDataFile object is greater than 1, 
	 * then the underlying file cannot be safely closed, so Close() becomes 
	 * a noop in that case. Close it only when the object is destroyed. 
	 * This would be safe, but could lead to a file descriptor leak.
	 */
	STDMETHOD(Close)		(THIS);
	
	/* Name returns the currently bound file name in FileName.
	 * and returns TRUE, if the a name has been bound.  Otherwise
	 * FALSE is returned.
	 */
	STDMETHOD_(BOOL, Name)		(THIS_
					REF(IHXBuffer*) pFileName);
	
	/*
	 * IsOpen returns TRUE if file is open.  Otherwise FALSE.
	 */
	STDMETHOD_(BOOL, IsOpen)	(THIS);
	
	/* Seek moves the current file position to the offset from the
	 * fromWhere specifier returns current position of file or -1 on
	 * error.
	 */
	STDMETHOD(Seek)			(THIS_
					ULONG32 offset, UINT16 fromWhere);
	
	/* Tell returns the current file position in the file */
	STDMETHOD_(ULONG32, Tell)	(THIS);
	
	/* Read reads up to count bytes of data into buf.
	 * returns the number of bytes read, EOF, or -1 if the read failed 
	 */
	STDMETHOD_(ULONG32, Read)	(THIS_
					REF(IHXBuffer*) pBuf, 
					ULONG32 count);
	
	/* Write writes up to count bytes of data from buf.
	 * returns the number of bytes written, or -1 if the write failed 
	 */
	STDMETHOD_(ULONG32, Write)	(THIS_
					REF(IHXBuffer*) pBuf); 
	
	/* Flush out the data in case of buffered I/O
	 */
	STDMETHOD(Flush)		(THIS);
	
	/*
	 * Return info about the data file such as permissions, time of creation
	 * size in bytes, etc.
	 */
	STDMETHOD(Stat)			(THIS_
					struct stat* buffer);
	
	/* Delete File */
	STDMETHOD(Delete)		(THIS);
	
	/* Return the file descriptor */
	STDMETHOD_(INT16, GetFd)	(THIS);
	
	/* GetLastError returns the platform specific file error */
	STDMETHOD(GetLastError)		(THIS);
	
	/* GetLastError returns the platform specific file error in
	 * string form.
	 */
	STDMETHOD_(void, GetLastError)	(THIS_
					REF(IHXBuffer*) err);

	/*
	 *  IHXAsyncDataFile
	 */
	STDMETHOD(SetReceiver)		(THIS_
					IHXCallback* pCallback);

	STDMETHOD(SeekAsync)		(THIS_
					REF(HX_RESULT) status, 
					ULONG32 offset, UINT16 fromWhere);

	STDMETHOD(ReadAsync)		(THIS_
					REF(ULONG32) ulReadSize,
					REF(IHXBuffer*) pBuf, 
					ULONG32 count);

	STDMETHOD(WriteAsync)		(THIS_
					REF(ULONG32) ulWrittenSize,
					REF(IHXBuffer*) pBuf);

	/*
	 *  Custom Public methods
	 */
	void Bind			(IHXBuffer* pFileNameBuffer);
	BOOL GetTemporaryFileName	(const char *tag, char* filename, UINT32 ulBufLen);

	/*
	 *  IUnknown methods
	 */
	STDMETHOD(QueryInterface)	(THIS_
					REFIID riid,
					void** ppvObj);
	
	STDMETHOD_(ULONG32, AddRef)	(THIS);
	
	STDMETHOD_(ULONG32, Release)	(THIS);

private:
	/*
	 *  Destructor
	 */
	~CSymbIHXDataFile(void);

	/*
	 *  Private Methods
	 */
	HX_RESULT _Create(UINT16 uOpenMode, BOOL bCreateFile);

	inline TUint TranslateOpenMode(UINT16 uOpenMode);
	inline TSeek TranslateSeekMode(UINT16 fromWhere);
	inline BOOL GetSession(void);

	IHXBuffer* m_pFileName;
	IHXSymbFileSessionManager* m_pSessionManager;

	RFs m_symbSession;
	BOOL m_bHaveSession;

	RFile m_symbFile;
	BOOL m_bOpen;
	TInt m_symbLastError;

	LONG32 m_lRefCount;

	PRIVATE_DESTRUCTORS_ARE_NOT_A_CRIME
};
	
#endif // _SYMBIHXDATAF_H_