CIRCBUF.H

/************************************************************************** 
 * 
 *  THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY 
 *  KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE 
 *  IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR 
 *  PURPOSE. 
 * 
 *  Copyright 1993 - 1998 Microsoft Corporation.  All Rights Reserved. 
 *  
 **************************************************************************/ 
 
/* 
 *  circbuf.h 
 */ 
 
 
/* Structure to manage the circular input buffer. 
 */ 
typedef struct circularBuffer_tag 
{ 
    HANDLE  hSelf;          /* handle to this structure */ 
    HANDLE  hBuffer;        /* buffer handle */ 
    WORD    wError;         /* error flags */ 
    DWORD   dwSize;         /* buffer size (in EVENTS) */ 
    DWORD   dwCount;        /* byte count (in EVENTS) */ 
    LPEVENT lpStart;        /* ptr to start of buffer */ 
    LPEVENT lpEnd;          /* ptr to end of buffer (last byte + 1) */ 
    LPEVENT lpHead;         /* ptr to head (next location to fill) */ 
    LPEVENT lpTail;         /* ptr to tail (next location to empty) */ 
} CIRCULARBUFFER; 
typedef CIRCULARBUFFER FAR *LPCIRCULARBUFFER; 
 
 
/* Function prototypes 
 */ 
LPCIRCULARBUFFER AllocCircularBuffer(DWORD dwSize); 
void FreeCircularBuffer(LPCIRCULARBUFFER lpBuf); 
WORD FAR PASCAL GetEvent(LPCIRCULARBUFFER lpBuf, LPEVENT lpEvent);