mirror of
https://github.com/oliverschmidt/contiki.git
synced 2024-09-11 21:55:41 +00:00
305 lines
11 KiB
C
305 lines
11 KiB
C
/**
|
|
* \addtogroup rime
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* \defgroup rimebuf Rime buffer management
|
|
* @{
|
|
*
|
|
* The rimebuf module does Rime's buffer management.
|
|
*/
|
|
|
|
/*
|
|
* Copyright (c) 2006, 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.
|
|
*
|
|
* $Id: rimebuf.h,v 1.8 2007/03/31 18:31:28 adamdunkels Exp $
|
|
*/
|
|
|
|
/**
|
|
* \file
|
|
* Header file for the Rime buffer (rimebuf) management
|
|
* \author
|
|
* Adam Dunkels <adam@sics.se>
|
|
*/
|
|
|
|
#ifndef __RIMEBUF_H__
|
|
#define __RIMEBUF_H__
|
|
|
|
#include "contiki-net.h"
|
|
|
|
/**
|
|
* \brief The size of the rimebuf, in bytes
|
|
*/
|
|
#ifdef RIMEBUF_CONF_SIZE
|
|
#define RIMEBUF_SIZE RIMEBUF_CONF_SIZE
|
|
#else
|
|
#define RIMEBUF_SIZE 128
|
|
#endif
|
|
|
|
/**
|
|
* \brief The size of the rimebuf header, in bytes
|
|
*/
|
|
#ifdef RIMEBUF_CONF_HDR_SIZE
|
|
#define RIMEBUF_HDR_SIZE RIMEBUF_CONF_HDR_SIZE
|
|
#else
|
|
#define RIMEBUF_HDR_SIZE 32
|
|
#endif
|
|
|
|
/**
|
|
* \brief Clear and reset the rimebuf
|
|
*
|
|
* This function clears the rimebuf and resets all
|
|
* internal state pointers (header size, header pointer,
|
|
* external data pointer). It is used before preparing a
|
|
* packet in the rimebuf.
|
|
*
|
|
*/
|
|
void rimebuf_clear(void);
|
|
|
|
/**
|
|
* \brief Get a pointer to the data in the rimebuf
|
|
* \return Pointer to the rimebuf data
|
|
*
|
|
* This function is used to get a pointer to the data in
|
|
* the rimebuf. The data is either stored in the rimebuf,
|
|
* or referenced to an external location.
|
|
*
|
|
* For outbound packets, the rimebuf consists of two
|
|
* parts: header and data. The header is accessed with the
|
|
* rimebuf_hdrptr() function.
|
|
*
|
|
* For incoming packets, both the packet header and the
|
|
* packet data is stored in the data portion of the
|
|
* rimebuf. Thus this function is used to get a pointer to
|
|
* the header for incoming packets.
|
|
*
|
|
*/
|
|
void *rimebuf_dataptr(void);
|
|
|
|
/**
|
|
* \brief Get a pointer to the header in the rimebuf, for outbound packets
|
|
* \return Pointer to the rimebuf header
|
|
*
|
|
* For outbound packets, the rimebuf consists of two
|
|
* parts: header and data. This function is used to get a
|
|
* pointer to the header in the rimebuf. The header is
|
|
* stored in the rimebuf.
|
|
*
|
|
*/
|
|
void *rimebuf_hdrptr(void);
|
|
|
|
/**
|
|
* \brief Get the length of the header in the rimebuf, for outbound packets
|
|
* \return Length of the header in the rimebuf
|
|
*
|
|
* For outbound packets, the rimebuf consists of two
|
|
* parts: header and data. This function is used to get
|
|
* the length of the header in the rimebuf. The header is
|
|
* stored in the rimebuf and accessed via the
|
|
* rimebuf_hdrptr() function.
|
|
*
|
|
*/
|
|
u8_t rimebuf_hdrlen(void);
|
|
|
|
|
|
/**
|
|
* \brief Get the length of the data in the rimebuf
|
|
* \return Length of the data in the rimebuf
|
|
*
|
|
* For outbound packets, the rimebuf consists of two
|
|
* parts: header and data. This function is used to get
|
|
* the length of the data in the rimebuf. The data is
|
|
* stored in the rimebuf and accessed via the
|
|
* rimebuf_dataptr() function.
|
|
*
|
|
* For incoming packets, both the packet header and the
|
|
* packet data is stored in the data portion of the
|
|
* rimebuf. This function is then used to get the total
|
|
* length of the packet - both header and data.
|
|
*
|
|
*/
|
|
u16_t rimebuf_datalen(void);
|
|
|
|
/**
|
|
* \brief Get the total length of the header and data in the rimebuf
|
|
* \return Length of data and header in the rimebuf
|
|
*
|
|
*/
|
|
u16_t rimebuf_totlen(void);
|
|
|
|
/**
|
|
* \brief Set the length of the data in the rimebuf
|
|
* \param len The length of the data
|
|
*
|
|
* For outbound packets, the rimebuf consists of two
|
|
* parts: header and data. This function is used to set
|
|
* the length of the data in the rimebuf.
|
|
*/
|
|
void rimebuf_set_datalen(u16_t len);
|
|
|
|
/**
|
|
* \brief Point the rimebuf to external data
|
|
* \param ptr A pointer to the external data
|
|
* \param len The length of the external data
|
|
*
|
|
* For outbound packets, the rimebuf consists of two
|
|
* parts: header and data. This function is used to make
|
|
* the rimebuf point to external data. The function also
|
|
* specifies the length of the external data that the
|
|
* rimebuf references.
|
|
*/
|
|
void rimebuf_reference(void *ptr, u16_t len);
|
|
|
|
/**
|
|
* \brief Check if the rimebuf references external data
|
|
* \retval Non-zero if the rimebuf references external data, zero otherwise.
|
|
*
|
|
* For outbound packets, the rimebuf consists of two
|
|
* parts: header and data. This function is used to check
|
|
* if the rimebuf points to external data that has
|
|
* previously been referenced with rimebuf_reference().
|
|
*
|
|
*/
|
|
int rimebuf_is_reference(void);
|
|
|
|
/**
|
|
* \brief Get a pointer to external data referenced by the rimebuf
|
|
* \retval A pointer to the external data
|
|
*
|
|
* For outbound packets, the rimebuf consists of two
|
|
* parts: header and data. The data may point to external
|
|
* data that has previously been referenced with
|
|
* rimebuf_reference(). This function is used to get a
|
|
* pointer to the external data.
|
|
*
|
|
*/
|
|
void *rimebuf_reference_ptr(void);
|
|
|
|
/**
|
|
* \brief Compact the rimebuf
|
|
*
|
|
* This function compacts the rimebuf by copying the data
|
|
* portion of the rimebuf so that becomes consecutive to
|
|
* the header. It also copies external data that has
|
|
* previously been referenced with rimebuf_reference()
|
|
* into the rimebuf.
|
|
*
|
|
* This function is called by the Rime code before a
|
|
* packet is to be sent by a device driver. This assures
|
|
* that the entire packet is consecutive in memory.
|
|
*
|
|
*/
|
|
void rimebuf_compact(void);
|
|
|
|
/**
|
|
* \brief Copy from external data into the rimebuf
|
|
* \param from A pointer to the data from which to copy
|
|
* \param len The size of the data to copy
|
|
* \retval The number of bytes that was copied into the rimebuf
|
|
*
|
|
* This function copies data from a pointer into the
|
|
* rimebuf. If the data that is to be copied is larger
|
|
* than the rimebuf, only the data that fits in the
|
|
* rimebuf is copied. The number of bytes that could be
|
|
* copied into the rimbuf is returned.
|
|
*
|
|
*/
|
|
int rimebuf_copyfrom(u8_t *from, u16_t len);
|
|
|
|
/**
|
|
* \brief Copy the entire rimebuf to an external buffer
|
|
* \param to A pointer to the buffer to which the data is to be copied
|
|
* \retval The number of bytes that was copied to the external buffer
|
|
*
|
|
* This function copies the rimebuf to an external
|
|
* buffer. Both the data portion and the header portion of
|
|
* the rimebuf is copied. If the rimebuf referenced
|
|
* external data (referenced with rimebuf_reference()) the
|
|
* external data is copied.
|
|
*
|
|
* The external buffer to which the rimebuf is to be
|
|
* copied must be able to accomodate at least
|
|
* (RIMEBUF_SIZE + RIMEBUF_HDR_SIZE) bytes. The number of
|
|
* bytes that was copied to the external buffer is
|
|
* returned.
|
|
*
|
|
*/
|
|
int rimebuf_copyto(u8_t *to);
|
|
|
|
/**
|
|
* \brief Copy the header portion of the rimebuf to an external buffer
|
|
* \param to A pointer to the buffer to which the data is to be copied
|
|
* \retval The number of bytes that was copied to the external buffer
|
|
*
|
|
* This function copies the header portion of the rimebuf
|
|
* to an external buffer.
|
|
*
|
|
* The external buffer to which the rimebuf is to be
|
|
* copied must be able to accomodate at least
|
|
* RIMEBUF_HDR_SIZE bytes. The number of bytes that was
|
|
* copied to the external buffer is returned.
|
|
*
|
|
*/
|
|
int rimebuf_copyto_hdr(u8_t *to);
|
|
|
|
/**
|
|
* \brief Extend the header of the rimebuf, for outbound packets
|
|
* \param size The number of bytes the header should be extended
|
|
* \retval Non-zero if the header could be extended, zero otherwise
|
|
*
|
|
* This function is used to allocate extra space in the
|
|
* header portion in the rimebuf, when preparing outbound
|
|
* packets for transmission. If the function is unable to
|
|
* allocate sufficient header space, the function returns
|
|
* zero and does not allocate anything.
|
|
*
|
|
*/
|
|
int rimebuf_hdralloc(int size);
|
|
|
|
/**
|
|
* \brief Reduce the header in the rimebuf, for incoming packets
|
|
* \param size The number of bytes the header should be reduced
|
|
* \retval Non-zero if the header could be reduced, zero otherwise
|
|
*
|
|
* This function is used to remove the first part of the
|
|
* header in the rimebuf, when processing incoming
|
|
* packets. If the function is unable to remove the
|
|
* requested amount of header space, the function returns
|
|
* zero and does not allocate anything.
|
|
*
|
|
*/
|
|
int rimebuf_hdrreduce(int size);
|
|
|
|
|
|
#endif /* __RIMEBUF_H__ */
|
|
/** @} */
|
|
/** @} */
|