hxbufdataf.h
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上传日期:2007-06-06
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文件大小:6k
- /* ***** 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 ***** */
- #ifndef _HX_BUFFERED_DATA_FILE_H_
- #define _HX_BUFFERED_DATA_FILE_H_
- #include "hxtypes.h"
- #include "hxcom.h"
- #include "hxdataf.h"
- class HXBufferedDataFile : public IHXDataFile {
- public:
- HXBufferedDataFile();
- virtual ~HXBufferedDataFile();
- /*
- * 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);
- /* 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
- HXBufferedDataFile(const HXBufferedDataFile&);
- HXBufferedDataFile& operator=(const HXBufferedDataFile&);
- 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 /* _HX_BUFFERED_DATA_FILE_H_ */