Jason Felds
70 lines
2.6 KiB
C++
70 lines
2.6 KiB
C++
/* RageFileDriverReadAhead - Read-ahead hinting for seamless rewinding. */
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#ifndef RAGE_FILE_DRIVER_READ_AHEAD_H
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#define RAGE_FILE_DRIVER_READ_AHEAD_H
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#include "RageFileBasic.h"
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class RageFileDriverReadAhead: public RageFileObj
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{
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public:
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/* This filter can only be used on supported files; test before using. */
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static bool FileSupported( RageFileBasic *pFile );
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/* pFile will be freed if DeleteFileWhenFinished is called. */
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RageFileDriverReadAhead( RageFileBasic *pFile, int iCacheBytes, int iPostBufferReadAhead = -1 );
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RageFileDriverReadAhead( const RageFileDriverReadAhead &cpy );
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~RageFileDriverReadAhead();
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RageFileDriverReadAhead *Copy() const;
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void DeleteFileWhenFinished() { m_bFileOwned = true; }
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virtual RString GetError() const { return m_pFile->GetError(); }
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virtual void ClearError() { return m_pFile->ClearError(); }
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int ReadInternal( void *pBuffer, size_t iBytes );
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int WriteInternal( const void *pBuffer, size_t iBytes ) { return m_pFile->Write( pBuffer, iBytes ); }
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int SeekInternal( int iOffset );
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int GetFileSize() const { return m_pFile->GetFileSize(); }
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int GetFD() { return m_pFile->GetFD(); }
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int Tell() const { return m_iFilePos; }
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private:
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void FillBuffer( int iBytes );
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RageFileBasic *m_pFile;
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int m_iFilePos;
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bool m_bFileOwned;
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RString m_sBuffer;
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int m_iPostBufferReadAhead;
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bool m_bReadAheadNeeded;
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};
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#endif
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/*
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* Copyright (c) 2010 Glenn Maynard
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* All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, and/or sell copies of the Software, and to permit persons to
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* whom the Software is furnished to do so, provided that the above
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* copyright notice(s) and this permission notice appear in all copies of
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* the Software and that both the above copyright notice(s) and this
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* permission notice appear in supporting documentation.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF
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* THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR HOLDERS
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* INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL INDIRECT
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* OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
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* OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
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* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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