fifo.h

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/******************************************************************************
**
**  COPYRIGHT (C) 2001 Intel Corporation
**
**  FILENAME:      	FIFO.h
**
**  PURPOSE:		A general purpose implementation of a FIFO
**
**  $Modtime: 7/17/03 1:01p $
**
******************************************************************************/

#ifndef _FIFO_h		// Only include this header file once!
#define _FIFO_h

/*
*******************************************************************************
*							DATA TYPES
*******************************************************************************
*/

typedef struct {
	UCHAR *head, *tail;
	UINT size;
	BOOL overrun, overwrite;
	FnPVOID onFirstCharFnP, onLastCharFnP;
	UCHAR buffer[1];
} FIFO_T;

/*
*******************************************************************************
*                            FUNCTION PROTOTYPES
*******************************************************************************
*/

// Set up a FIFO.
FIFO_T *FIFOalloc(UINT size, FnPVOID onFirstCharFnP, FnPVOID onLastCharFnP);
// Put a character into a FIFO.
ErrorT FIFOput(FIFO_T *r, UCHAR c);
// Get a character from a FIFO.
INT16 FIFOget(FIFO_T *r);
// Nondistructive get a character in a FIFO.
INT16 FIFOpeek(FIFO_T *r);
// Get the number of characters in a FIFO.
UINT FIFOcharsAvailable(FIFO_T *r);
// Set the overwrite mode of the FIFOput function.
void FIFOoverwrite(FIFO_T *r, BOOL overwrite);
// Has an overrun of the FIFO occurred?
BOOL FIFOoverrun(FIFO_T *r);
// Get the character that was discarded on FIFO overflow.
UCHAR FIFOoverrunChar(FIFO_T *r);

#endif	// _FIFO_h