contiki/core/net/uipbuf.h

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/*
* Copyright (c) 2004, Swedish Institute of Computer Science.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This file is part of the Contiki operating system.
*
* Author: Adam Dunkels <adam@sics.se>
*
* $Id: uipbuf.h,v 1.1 2006/06/17 22:41:19 adamdunkels Exp $
*/
/**
* \file
* uIP data buffering helper functions.
* \author
* Adam Dunkels <adam@sics.se>
*
*/
#if 0 /* This whole file is #ifdef'd out - the contents are to be removed */
#ifndef __UIPBUF_H__
#define __UIPBUF_H__
#include "net/uip.h"
/**
* \defgroup uipbuf uIP data buffering helper library.
*
* The event driven API that uIP uses can be tricky to use when
* dealing with incoming TCP data. The data can be split over any
* number of incoming segments and uIP does not provide any stream
* abstraction by itself. To remedy this, the uIP data buffering
* helper library provides a set of functions that make buffering data
* easier.
*
* The data buffering library provides a structure that holds a
* pointer to a buffer and the state of the buffer, as well as a set
* of functions for manipulating the buffer state. The functions are
* intended to facilitate buffering of both data that is of a known
* size and data that is terminated by a specified byte.
*
* @{
*/
/**
* Return value of the buffering functions that indicates that a
* buffer was not filled by incoming data.
*
* \hideinitializer
*/
#define UIPBUF_NOT_FULL 0
#define UIPBUF_NOT_FOUND 0
/**
* Return value of the buffering functions that indicates that a
* buffer was completely filled by incoming data.
*
* \hideinitializer
*/
#define UIPBUF_FULL 1
/**
* Return value of the buffering functions that indicates that an
* end-marker byte was found.
*
* \hideinitializer
*/
#define UIPBUF_FOUND 2
/**
* The structure that holds the state of a uIP buffer.
*
* This structure holds the state of a uIP buffer. The structure has
* no user-visible elements, but is used through the functions
* provided by the library.
*
* \hideinitializer
*/
struct uipbuf_buffer {
u8_t *ptr, *buffer;
unsigned short left, bufsize;
};
/**
* Set up a new uIP buffer structure.
*
* This function is used for setting up a uIP buffer structure with a
* specified size. The function should be called the first time a uIP
* buffer is used. The caller must provide the memory for holding the
* buffered bytes and the size of the buffer memory.
*
* \param buf A pointer to a uipbuf_buffer structure that is to be
* initialized.
*
* \param bufptr A pointer to the memory for holding the buffered
* data.
*
* \param size The size of the buffer memory.
*
*/
void uipbuf_setup(struct uipbuf_buffer *buf,
u8_t *bufptr, u16_t size);
/**
* Buffer data until the buffer is full.
*
* This function puts data into the buffer, but no more than the
* buffer can hold.
*
* \param buf A pointer to the ::uipbuf_buffer structure that holds
* the state of the buffer.
*
* \param dataptr A pointer to the data that is to be buffered.
*
* \param datalen The length of the data that is to be buffered.
*
* \return If the buffer was not filled, the value UIPBUF_NOT_FULL
* is returned. If the buffer was filled, the number of bytes that
* could not be buffered is returned. If the buffer was exactly filled
* with the data, the value of 0 is returned.
*
*/
u8_t uipbuf_bufdata(struct uipbuf_buffer *buf, u16_t len,
u8_t **dataptr, u16_t *datalen);
/**
* Buffer data until a specific character is found or the buffer is full.
*
* This function puts data into the buffer until a specific marker
* byte is found. The marker byte is put into the buffer at the end of
* the data.
*
* \param buf A pointer to the ::uipbuf_buffer structure that holds
* the state of the buffer.
*
* \param dataptr A pointer to the data that is to be buffered.
*
* \param datalen The length of the data that is to be buffered.
*
* \param byte The end-marker byte that indicates the end of the data
* that is to be buffered.
*
* \return This function returns the number of protruding bytes after
* the end-marker byte, if the marker was found. If the marker was not
* found and all of the data was buffered, the value of
* UIPBUF_NOT_FOUND is returned. If the marker was not found, but the
* data made the buffer fill up, the value of UIPBUF_FULL is returned.
*
*/
u8_t uipbuf_bufto(struct uipbuf_buffer *buf, u8_t endmarker,
u8_t **dataptr, u16_t *datalen);
u16_t uipbuf_len(struct uipbuf_buffer *buf);
/** @} */
#endif /* __UIPBUF_H__ */
#endif /* 0 */