--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/network/Lib/RingBuff.h	Sat Sep 15 21:49:05 2012 +0800
@@ -0,0 +1,117 @@
+/*
+             LUFA Library
+     Copyright (C) Dean Camera, 2010.
+              
+  dean [at] fourwalledcubicle [dot] com
+      www.fourwalledcubicle.com
+*/
+
+/*
+  Copyright 2010  Dean Camera (dean [at] fourwalledcubicle [dot] com)
+
+  Permission to use, copy, modify, distribute, and sell this 
+  software and its documentation for any purpose is hereby granted
+  without fee, provided that the above copyright notice appear in 
+  all copies and that both that the copyright notice and this
+  permission notice and warranty disclaimer appear in supporting 
+  documentation, and that the name of the author not be used in 
+  advertising or publicity pertaining to distribution of the 
+  software without specific, written prior permission.
+
+  The author disclaim all warranties with regard to this
+  software, including all implied warranties of merchantability
+  and fitness.  In no event shall the author be liable for any
+  special, indirect or consequential damages or any damages
+  whatsoever resulting from loss of use, data or profits, whether
+  in an action of contract, negligence or other tortious action,
+  arising out of or in connection with the use or performance of
+  this software.
+*/
+
+/* Buffer Configuration: */
+   /* Buffer length - select static size of created ring buffers: */
+	 #define BUFF_STATICSIZE 128      // Set to the static ring buffer size for all ring buffers (place size after define)
+
+   /* Volatile mode - uncomment to make buffers volatile, for use in ISRs, etc: */
+	 // #define BUFF_VOLATILE         // Uncomment to cause all ring buffers to become volatile (and atomic if multi-byte) in access
+
+   /* Drop mode - select behaviour when Buffer_StoreElement called on a full buffer: */
+     #define BUFF_DROPOLD             // Uncomment to cause full ring buffers to drop the oldest character to make space when full
+     // #define BUFF_DROPNEW          // Uncomment to cause full ring buffers to drop the new character when full
+     // #define BUFF_NODROPCHECK      // Uncomment to ignore full ring buffer checks - checking left to user!
+
+   /* Underflow behaviour - select behaviour when Buffer_GetElement is called with an empty ring buffer: */
+     //#define BUFF_EMPTYRETURNSZERO  // Uncomment to return 0 when an empty ring buffer is read
+     #define BUFF_NOEMPTYCHECK        // Uncomment to disable checking of empty ring buffers - checking left to user!
+	
+   /* Buffer storage type - set the datatype for the stored data */
+     #define BUFF_DATATYPE uint8_t    // Change to the data type that is going to be stored into the buffer
+	
+   /* Peek routine - uncomment to include the peek routine (fetches next byte without removing it from the buffer */
+     //#define BUFF_USEPEEK
+	 	
+#ifndef _RINGBUFF_H_
+#define _RINGBUFF_H_
+
+	/* Includes: */
+	#include <avr/io.h>
+	#include <avr/interrupt.h>
+	#include <util/atomic.h>
+	#include <limits.h>
+
+	#include <LUFA/Common/Common.h>
+
+	/* Defines and checks: */
+	#if defined(BUFF_STATICSIZE)
+		#define BUFF_LENGTH BUFF_STATICSIZE
+	#else
+		#error No buffer length specified!
+	#endif
+
+	#if !(defined(BUFF_DROPOLD) || defined(BUFF_DROPNEW) || defined(BUFF_NODROPCHECK))
+		#error No buffer drop mode specified.
+	#endif
+
+	#if !defined(BUFF_DATATYPE)
+		#error Ringbuffer storage data type not specified.
+	#endif
+
+	#if defined(BUFF_VOLATILE)
+		#define BUFF_MODE            volatile
+		#define BUFF_ATOMIC_BLOCK    ATOMIC_BLOCK(ATOMIC_RESTORESTATE)
+	#else
+		#define BUFF_MODE
+		#define BUFF_ATOMIC_BLOCK
+	#endif
+
+	#if (BUFF_STATICSIZE   > LONG_MAX)
+		#define RingBuff_Elements_t uint64_t
+	#elif (BUFF_STATICSIZE > INT_MAX)
+		#define RingBuff_Elements_t uint32_t
+	#elif (BUFF_STATICSIZE > CHAR_MAX)
+		#define RingBuff_Elements_t uint16_t
+	#else
+		#define RingBuff_Elements_t uint8_t
+	#endif
+	
+	/* Type Defines: */
+	typedef BUFF_DATATYPE RingBuff_Data_t;
+
+	typedef BUFF_MODE struct
+	{
+		RingBuff_Data_t      Buffer[BUFF_LENGTH];
+		RingBuff_Data_t*     InPtr;
+		RingBuff_Data_t*     OutPtr;
+		RingBuff_Elements_t  Elements;
+	} RingBuff_t;
+		
+	/* Function Prototypes: */
+	void            Buffer_Initialize(RingBuff_t* const Buff);
+	void            Buffer_StoreElement(RingBuff_t* const Buffer,
+	                                    RingBuff_Data_t Data);
+	RingBuff_Data_t Buffer_GetElement(RingBuff_t* const Buffer);
+	#if defined(BUFF_USEPEEK)
+		RingBuff_Data_t Buffer_PeekElement(const RingBuff_t* const Buffer);
+	#endif
+	
+#endif