contiki/apps/slip-cmd/packetutils.c

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/*
* Copyright (c) 2011, 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.
*/
#include "contiki.h"
#include "net/packetbuf.h"
#define DEBUG DEBUG_NONE
#include "net/ip/uip-debug.h"
/*---------------------------------------------------------------------------*/
int
packetutils_serialize_atts(uint8_t *data, int size)
{
int i;
/* set the length first later */
int pos = 1;
int cnt = 0;
/* assume that values are 16-bit */
uint16_t val;
PRINTF("packetutils: serializing packet atts");
for(i = 0; i < PACKETBUF_NUM_ATTRS; i++) {
val = packetbuf_attr(i);
if(val != 0) {
if(pos + 3 > size) {
return -1;
}
data[pos++] = i;
data[pos++] = val >> 8;
data[pos++] = val & 255;
cnt++;
PRINTF(" %d=%d", i, val);
}
}
PRINTF(" (%d)\n", cnt);
data[0] = cnt;
return pos;
}
/*---------------------------------------------------------------------------*/
int
packetutils_deserialize_atts(const uint8_t *data, int size)
{
int i, cnt, pos;
pos = 0;
cnt = data[pos++];
PRINTF("packetutils: deserializing %d packet atts:", cnt);
if(cnt > PACKETBUF_NUM_ATTRS) {
PRINTF(" *** too many: %u!\n", PACKETBUF_NUM_ATTRS);
return -1;
}
for(i = 0; i < cnt; i++) {
if(data[pos] >= PACKETBUF_NUM_ATTRS) {
/* illegal attribute identifier */
PRINTF(" *** unknown attribute %u\n", data[pos]);
return -1;
}
PRINTF(" %d=%d", data[pos], (data[pos + 1] << 8) | data[pos + 2]);
packetbuf_set_attr(data[pos], (data[pos + 1] << 8) | data[pos + 2]);
pos += 3;
}
PRINTF("\n");
return pos;
}
/*---------------------------------------------------------------------------*/