cbufferfile.h
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上传日期:2007-06-06
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- /* ***** 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 ***** */
- #pragma once
- enum
- {
- kBufLow = 0,
- kBufHigh,
- kBoth
- };
- #ifndef __CBUFFERFILE_DEFAULTBUFFER
- #define __CBUFFERFILE_DEFAULTBUFFER 65534 ///32767
- #endif
- class CBufferFile
- {
-
- public:
- CBufferFile (void);
- virtual ~CBufferFile ();
- Boolean PreLoad(long startPos, long bytesReq);
- virtual long Copy(Ptr destBuf, long numBytes);
- void CheckBuffer(void);
- Boolean Specify(short fRefNum, long bufSize = __CBUFFERFILE_DEFAULTBUFFER);
- long Load(short loadFlag);
- Boolean Loaded(void) {return mLoaded;};
-
- protected:
-
- Ptr mLow;
- Ptr mHigh;
- long mCurPos;
- long mSize;
- long mBufSize;
-
- long mStartPos;
- long ioPosOffset;
- long mBytesTotal;
- long mBytesRemaining;
- long mBytesToCopy;
-
- Boolean fFillLow;
- Boolean mLoaded;
-
- IOParam a_PB; // pointer to PB file i/o struct
- IOParam b_PB; // PB file i/o struct for looping
- };
-