nes-proj/core/net/rime/rucb.c

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/*
* 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.
*
*/
/**
* \file
* Reliable unicast bulk transfer
* \author
* Adam Dunkels <adam@sics.se>
*/
#include "net/rime/rucb.h"
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#include "net/rime/rime.h"
#include <string.h>
#define MAX_TRANSMISSIONS 8
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#define DEBUG 0
#if DEBUG
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
/*---------------------------------------------------------------------------*/
static int
read_data(struct rucb_conn *c)
{
int len = 0;
packetbuf_clear();
if(c->u->read_chunk) {
len = c->u->read_chunk(c, c->chunk * RUCB_DATASIZE,
packetbuf_dataptr(), RUCB_DATASIZE);
}
packetbuf_set_datalen(len);
return len;
}
/*---------------------------------------------------------------------------*/
static void
acked(struct runicast_conn *ruc, const linkaddr_t *to, uint8_t retransmissions)
{
struct rucb_conn *c = (struct rucb_conn *)ruc;
int len;
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PRINTF("%d.%d: rucb acked\n",
linkaddr_node_addr.u8[0],linkaddr_node_addr.u8[1]);
c->chunk++;
len = read_data(c);
if(len == 0 && c->last_size == 0) {
/* Nothing more to do */
return;
}
if(len >= 0) {
runicast_send(&c->c, &c->receiver, MAX_TRANSMISSIONS);
c->last_size = len;
}
}
/*---------------------------------------------------------------------------*/
static void
timedout(struct runicast_conn *ruc, const linkaddr_t *to, uint8_t retransmissions)
{
struct rucb_conn *c = (struct rucb_conn *)ruc;
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PRINTF("%d.%d: rucb timedout\n",
linkaddr_node_addr.u8[0],linkaddr_node_addr.u8[1]);
if(c->u->timedout) {
c->u->timedout(c);
}
}
/*---------------------------------------------------------------------------*/
static void
recv(struct runicast_conn *ruc, const linkaddr_t *from, uint8_t seqno)
{
struct rucb_conn *c = (struct rucb_conn *)ruc;
PRINTF("%d.%d: rucb: recv from %d.%d len %d\n",
linkaddr_node_addr.u8[0],linkaddr_node_addr.u8[1],
from->u8[0], from->u8[1], packetbuf_totlen());
if(seqno == c->last_seqno) {
return;
}
c->last_seqno = seqno;
if(linkaddr_cmp(&c->sender, &linkaddr_null)) {
linkaddr_copy(&c->sender, from);
c->u->write_chunk(c, 0, RUCB_FLAG_NEWFILE, packetbuf_dataptr(), 0);
c->chunk = 0;
}
if(linkaddr_cmp(&c->sender, from)) {
int datalen = packetbuf_datalen();
if(datalen < RUCB_DATASIZE) {
PRINTF("%d.%d: get %d bytes, file complete\n",
linkaddr_node_addr.u8[0], linkaddr_node_addr.u8[1],
datalen);
c->u->write_chunk(c, c->chunk * RUCB_DATASIZE,
RUCB_FLAG_LASTCHUNK, packetbuf_dataptr(), datalen);
} else {
c->u->write_chunk(c, c->chunk * RUCB_DATASIZE,
RUCB_FLAG_NONE, packetbuf_dataptr(), datalen);
}
c->chunk++;
}
if(packetbuf_datalen() < RUCB_DATASIZE) {
linkaddr_copy(&c->sender, &linkaddr_null);
}
}
/*---------------------------------------------------------------------------*/
static const struct runicast_callbacks ruc = {recv, acked, timedout};
/*---------------------------------------------------------------------------*/
void
rucb_open(struct rucb_conn *c, uint16_t channel,
const struct rucb_callbacks *u)
{
linkaddr_copy(&c->sender, &linkaddr_null);
runicast_open(&c->c, channel, &ruc);
c->u = u;
c->last_seqno = -1;
c->last_size = -1;
}
/*---------------------------------------------------------------------------*/
void
rucb_close(struct rucb_conn *c)
{
runicast_close(&c->c);
}
/*---------------------------------------------------------------------------*/
int
rucb_send(struct rucb_conn *c, const linkaddr_t *receiver)
{
c->chunk = 0;
read_data(c);
linkaddr_copy(&c->receiver, receiver);
linkaddr_copy(&c->sender, &linkaddr_node_addr);
runicast_send(&c->c, receiver, MAX_TRANSMISSIONS);
return 0;
}
/*---------------------------------------------------------------------------*/