buffer.h

ATMEL的AVR单片机库文件

/*! \file buffer.h \brief Multipurpose byte buffer structure and methods. */
//*****************************************************************************
//
// File Name	: 'buffer.h'
// Title		: Multipurpose byte buffer structure and methods
// Author		: Pascal Stang - Copyright (C) 2001-2002
// Created		: 9/23/2001
// Revised		: 11/16/2002
// Version		: 1.1
// Target MCU	: any
// Editor Tabs	: 4
//
// This code is distributed under the GNU Public License
//		which can be found at http://www.gnu.org/licenses/gpl.txt
//
//*****************************************************************************

#ifndef BUFFER_H
#define BUFFER_H

// structure/typdefs

// the cBuffer structure
typedef struct struct_cBuffer
{
	unsigned char *dataptr;			// the physical memory address where the buffer is stored
	unsigned short size;			// the allocated size of the buffer
	unsigned short datalength;		// the length of the data currently in the buffer
	unsigned short dataindex;		// the index into the buffer where the data starts
} cBuffer;

// function prototypes

//! initialize a buffer to start at a given address and have given size
void			bufferInit(cBuffer* buffer, unsigned char *start, unsigned short size);

//! get the first byte from the front of the buffer
unsigned char	bufferGetFromFront(cBuffer* buffer);

//! dump (discard) the first numbytes from the front of the buffer
void bufferDumpFromFront(cBuffer* buffer, unsigned short numbytes);

//! get a byte at the specified index in the buffer (kind of like array access)
// ** note: this does not remove the byte that was read from the buffer
unsigned char	bufferGetAtIndex(cBuffer* buffer, unsigned short index);

//! add a byte to the end of the buffer
unsigned char	bufferAddToEnd(cBuffer* buffer, unsigned char data);

//! check if the buffer is full/not full (returns non-zero value if not full)
unsigned char	bufferIsNotFull(cBuffer* buffer);

//! flush (clear) the contents of the buffer
void			bufferFlush(cBuffer* buffer);

#endif