casyncbuffer.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
- class CAsyncBuffer {
- private:
-
- Ptr mBuffer;
- Size mSize;
-
- long mLim;
- long mMark;
-
- QHdr mPBQueue;
- short mBusy;
-
- short mClearIndex;
-
- public:
-
- CAsyncBuffer (Size inSize,
- QElemPtr inpb = nil);
- virtual ~CAsyncBuffer (void);
-
- inline OSErr PBAlloc (QElemPtr inpb)
- {return ::Dequeue (inpb, &mPBQueue);};
- inline void PBFree (QElemPtr inpb)
- {if (inpb) ::Enqueue (inpb, &mPBQueue);};
-
- inline short Busy (void) const
- {return mBusy;};
- inline void SetBusy (void)
- {mBusy++;};
- inline void ClearBusy (void)
- {mBusy--;};
-
- inline Size BufferSize (void) const
- {return mSize;};
- inline Ptr Buffer (void) const
- {return mBuffer;};
- inline long Lim (void) const
- {return mLim;};
-
- inline long Available (void) const
- {return mSize - mMark;};
- inline long Remaining (void) const
- {return mLim - mMark;};
-
- inline void Load (long inLim)
- {mLim = inLim; mMark = 0;};
- long Read (void *inBuffer,
- long inBufferLen);
- long Write (const void *inBuffer,
- long inBufferLen);
-
- void NextClearIndex (void) {mClearIndex = 1 - mClearIndex;};
- void ClearBuffer (void);
- void DebugBuffer (void);
- };
-