255 lines
7.2 KiB
C
255 lines
7.2 KiB
C
/*
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* Copyright (c) 2006, Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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*/
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/**
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* \file
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* Rime buffer (packetbuf) management
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* \author
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* Adam Dunkels <adam@sics.se>
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*/
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/**
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* \addtogroup packetbuf
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* @{
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*/
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#include <string.h>
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#include "contiki-net.h"
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#include "net/packetbuf.h"
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#include "net/rime/rime.h"
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#include "sys/cc.h"
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struct packetbuf_attr packetbuf_attrs[PACKETBUF_NUM_ATTRS];
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struct packetbuf_addr packetbuf_addrs[PACKETBUF_NUM_ADDRS];
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static uint16_t buflen, bufptr;
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static uint8_t hdrlen;
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/* The declarations below ensure that the packet buffer is aligned on
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an even 32-bit boundary. On some platforms (most notably the
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msp430 or OpenRISC), having a potentially misaligned packet buffer may lead to
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problems when accessing words. */
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static uint32_t packetbuf_aligned[(PACKETBUF_SIZE + 3) / 4];
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static uint8_t *packetbuf = (uint8_t *)packetbuf_aligned;
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#define DEBUG 0
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#if DEBUG
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#include <stdio.h>
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#define PRINTF(...) printf(__VA_ARGS__)
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#else
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#define PRINTF(...)
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#endif
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/*---------------------------------------------------------------------------*/
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void
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packetbuf_clear(void)
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{
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buflen = bufptr = 0;
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hdrlen = 0;
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packetbuf_attr_clear();
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}
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/*---------------------------------------------------------------------------*/
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int
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packetbuf_copyfrom(const void *from, uint16_t len)
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{
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uint16_t l;
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packetbuf_clear();
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l = MIN(PACKETBUF_SIZE, len);
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memcpy(packetbuf, from, l);
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buflen = l;
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return l;
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}
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/*---------------------------------------------------------------------------*/
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void
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packetbuf_compact(void)
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{
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int16_t i;
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if(bufptr) {
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/* shift data to the left */
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for(i = 0; i < buflen; i++) {
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packetbuf[hdrlen + i] = packetbuf[packetbuf_hdrlen() + i];
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}
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bufptr = 0;
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}
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}
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/*---------------------------------------------------------------------------*/
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int
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packetbuf_copyto(void *to)
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{
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if(hdrlen + buflen > PACKETBUF_SIZE) {
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return 0;
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}
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memcpy(to, packetbuf_hdrptr(), hdrlen);
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memcpy((uint8_t *)to + hdrlen, packetbuf_dataptr(), buflen);
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return hdrlen + buflen;
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}
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/*---------------------------------------------------------------------------*/
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int
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packetbuf_hdralloc(int size)
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{
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int16_t i;
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if(size + packetbuf_totlen() > PACKETBUF_SIZE) {
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return 0;
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}
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/* shift data to the right */
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for(i = packetbuf_totlen() - 1; i >= 0; i--) {
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packetbuf[i + size] = packetbuf[i];
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}
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hdrlen += size;
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return 1;
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}
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/*---------------------------------------------------------------------------*/
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int
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packetbuf_hdrreduce(int size)
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{
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if(buflen < size) {
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return 0;
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}
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bufptr += size;
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buflen -= size;
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return 1;
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}
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/*---------------------------------------------------------------------------*/
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void
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packetbuf_set_datalen(uint16_t len)
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{
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PRINTF("packetbuf_set_len: len %d\n", len);
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buflen = len;
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}
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/*---------------------------------------------------------------------------*/
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void *
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packetbuf_dataptr(void)
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{
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return packetbuf + packetbuf_hdrlen();
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}
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/*---------------------------------------------------------------------------*/
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void *
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packetbuf_hdrptr(void)
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{
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return packetbuf;
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}
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/*---------------------------------------------------------------------------*/
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uint16_t
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packetbuf_datalen(void)
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{
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return buflen;
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}
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/*---------------------------------------------------------------------------*/
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uint8_t
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packetbuf_hdrlen(void)
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{
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return bufptr + hdrlen;
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}
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/*---------------------------------------------------------------------------*/
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uint16_t
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packetbuf_totlen(void)
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{
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return packetbuf_hdrlen() + packetbuf_datalen();
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}
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/*---------------------------------------------------------------------------*/
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uint16_t
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packetbuf_remaininglen(void)
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{
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return PACKETBUF_SIZE - packetbuf_totlen();
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}
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/*---------------------------------------------------------------------------*/
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void
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packetbuf_attr_clear(void)
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{
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int i;
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memset(packetbuf_attrs, 0, sizeof(packetbuf_attrs));
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for(i = 0; i < PACKETBUF_NUM_ADDRS; ++i) {
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linkaddr_copy(&packetbuf_addrs[i].addr, &linkaddr_null);
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}
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}
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/*---------------------------------------------------------------------------*/
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void
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packetbuf_attr_copyto(struct packetbuf_attr *attrs,
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struct packetbuf_addr *addrs)
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{
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memcpy(attrs, packetbuf_attrs, sizeof(packetbuf_attrs));
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memcpy(addrs, packetbuf_addrs, sizeof(packetbuf_addrs));
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}
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/*---------------------------------------------------------------------------*/
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void
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packetbuf_attr_copyfrom(struct packetbuf_attr *attrs,
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struct packetbuf_addr *addrs)
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{
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memcpy(packetbuf_attrs, attrs, sizeof(packetbuf_attrs));
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memcpy(packetbuf_addrs, addrs, sizeof(packetbuf_addrs));
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}
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/*---------------------------------------------------------------------------*/
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#if !PACKETBUF_CONF_ATTRS_INLINE
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int
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packetbuf_set_attr(uint8_t type, const packetbuf_attr_t val)
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{
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packetbuf_attrs[type].val = val;
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return 1;
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}
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/*---------------------------------------------------------------------------*/
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packetbuf_attr_t
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packetbuf_attr(uint8_t type)
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{
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return packetbuf_attrs[type].val;
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}
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/*---------------------------------------------------------------------------*/
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int
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packetbuf_set_addr(uint8_t type, const linkaddr_t *addr)
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{
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linkaddr_copy(&packetbuf_addrs[type - PACKETBUF_ADDR_FIRST].addr, addr);
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return 1;
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}
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/*---------------------------------------------------------------------------*/
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const linkaddr_t *
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packetbuf_addr(uint8_t type)
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{
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return &packetbuf_addrs[type - PACKETBUF_ADDR_FIRST].addr;
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}
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/*---------------------------------------------------------------------------*/
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#endif /* PACKETBUF_CONF_ATTRS_INLINE */
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int
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packetbuf_holds_broadcast(void)
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{
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return linkaddr_cmp(&packetbuf_addrs[PACKETBUF_ADDR_RECEIVER - PACKETBUF_ADDR_FIRST].addr, &linkaddr_null);
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}
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/*---------------------------------------------------------------------------*/
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/** @} */
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