symbian 下的helix player源代码

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				/* ***** BEGIN LICENSE BLOCK *****
				 * Source last modified: $Id: opwavehxdataf.h,v 1.1.32.3 2004/07/09 01:44:33 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 ***** */
				
				#ifndef _OPENWAVE_HXDATA_FILE_H_
				#define _OPENWAVE_HXDATA_FILE_H_
				
				#include "hxtypes.h"
				#include "hxcom.h"
				#include "hxdataf.h"
				
				class OpenwaveHXDataFile : public IHXDataFile {
				public:
					
					OpenwaveHXDataFile(IUnknown** ppCommonObj = NULL);
				    virtual			~OpenwaveHXDataFile();
				
				    /*
				     *  IUnknown methods
				     */
				    STDMETHOD(QueryInterface)		(THIS_
									REFIID riid,
									void** ppvObj);
				    
				    STDMETHOD_(ULONG32, AddRef)		(THIS);
				    
				    STDMETHOD_(ULONG32, Release)	(THIS);
				    
				    /*
				     *  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);
				
				protected:
				    INT32 NewBuf();		// grab a new buffer
				    INT32 FillBuf();		// fill buffer around current position
				    INT32 FlushBuf();		// flush buffer
				    void AllocBuf();		// allocate buffer
				    void FreeBuf();		// free buffer
								// read data at given position
				    INT32 Pread(void* buf, INT32 nbytes, ULONG32 off);
								// write data at given position
				    INT32 Pwrite(const void* buf, INT32 nbytes, ULONG32 off);
				    ULONG32 FlushSize();	// return flushed file size
				    ULONG32 LogicalSize();	// return file size including unflushed data
				    INT32 GetFileStat(struct stat* buf) const; // get file stat
				
				    INT32 GetPageSize() const;	// get page size from system
				
				private:
								// don't implement these
				    OpenwaveHXDataFile(const OpenwaveHXDataFile&);
				    OpenwaveHXDataFile& operator=(const OpenwaveHXDataFile&);
				
					UINT32				m_ulPos;
				
				    LONG32 m_lRefCount;		// reference count
				    UINT32 m_LastError;		// error from last operation
				    IHXBuffer* m_pFileName;	// file name
				    int m_Fd;			// file descriptor
				    UINT16 m_Flags;		// open flags
				    ULONG32 m_Begin;		// beginning of buffer
				    UINT32 m_BufSize;		// buffer size
				    UINT32 m_BufFill;		// bytes in buffer from last fill
				    ULONG32 m_Offset;		// current seek offset
				    ULONG32 m_FileOffset;	// current seek offset in file
				    ULONG32 m_FlushSize;	// current flushed size of file
				    char* m_pBuf;		// buffer
				    UINT32 m_Dirty;		// buffer has been written over
				};
				
				#endif /* _OPENWAVE_HXDATA_FILE_H_ */
							

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