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

228 lines
6.1 KiB
C

/**
* \addtogroup rimebuf
* @{
*/
/*
* 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.c,v 1.10 2007/11/17 18:05:21 adamdunkels Exp $
*/
/**
* \file
* Rime buffer (rimebuf) management
* \author
* Adam Dunkels <adam@sics.se>
*/
#include <string.h>
#include "contiki-net.h"
#include "net/rime/rimebuf.h"
#include "net/rime.h"
static u16_t buflen, bufptr;
static u8_t hdrptr;
static u8_t rimebuf[RIMEBUF_SIZE + RIMEBUF_HDR_SIZE];
static u8_t *rimebufptr;
#define DEBUG 0
#if DEBUG
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
/*---------------------------------------------------------------------------*/
void
rimebuf_clear(void)
{
buflen = bufptr = 0;
hdrptr = RIMEBUF_HDR_SIZE;
rimebufptr = &rimebuf[RIMEBUF_HDR_SIZE];
}
/*---------------------------------------------------------------------------*/
int
rimebuf_copyfrom(const void *from, u16_t len)
{
u16_t l;
rimebuf_clear();
l = len > RIMEBUF_SIZE? RIMEBUF_SIZE: len;
memcpy(rimebufptr, from, l);
buflen = l;
return l;
}
/*---------------------------------------------------------------------------*/
void
rimebuf_compact(void)
{
if(rimebuf_is_reference()) {
memcpy(&rimebuf[RIMEBUF_HDR_SIZE], rimebuf_reference_ptr(),
rimebuf_datalen());
} else {
memcpy(&rimebuf[RIMEBUF_HDR_SIZE], &rimebuf[bufptr + RIMEBUF_HDR_SIZE],
rimebuf_datalen());
bufptr = 0;
}
}
/*---------------------------------------------------------------------------*/
int
rimebuf_copyto_hdr(u8_t *to)
{
#if DEBUG_LEVEL > 0
{
int i;
PRINTF("rimebuf_write_hdr: header:\n");
for(i = hdrptr; i < RIMEBUF_HDR_SIZE; ++i) {
PRINTF("0x%02x, ", rimebuf[i]);
}
PRINTF("\n");
}
#endif /* DEBUG_LEVEL */
memcpy(to, rimebuf + hdrptr, RIMEBUF_HDR_SIZE - hdrptr);
return RIMEBUF_HDR_SIZE - hdrptr;
}
/*---------------------------------------------------------------------------*/
int
rimebuf_copyto(void *to)
{
#if DEBUG_LEVEL > 0
{
int i;
char buffer[1000];
char *bufferptr = buffer;
bufferptr[0] = 0;
for(i = hdrptr; i < RIMEBUF_HDR_SIZE; ++i) {
bufferptr += sprintf(bufferptr, "0x%02x, ", rimebuf[i]);
}
PRINTF("rimebuf_write: header: %s\n", buffer);
bufferptr = buffer;
bufferptr[0] = 0;
for(i = bufptr; i < buflen + bufptr; ++i) {
bufferptr += sprintf(bufferptr, "0x%02x, ", rimebufptr[i]);
}
PRINTF("rimebuf_write: data: %s\n", buffer);
}
#endif /* DEBUG_LEVEL */
memcpy(to, rimebuf + hdrptr, RIMEBUF_HDR_SIZE - hdrptr);
memcpy((u8_t *)to + RIMEBUF_HDR_SIZE - hdrptr, rimebufptr + bufptr,
buflen);
return RIMEBUF_HDR_SIZE - hdrptr + buflen;
}
/*---------------------------------------------------------------------------*/
int
rimebuf_hdralloc(int size)
{
if(hdrptr > size) {
hdrptr -= size;
return 1;
}
hdrptr = 0;
return 0;
}
/*---------------------------------------------------------------------------*/
int
rimebuf_hdrreduce(int size)
{
if(buflen < size) {
return 0;
}
bufptr += size;
buflen -= size;
return 1;
}
/*---------------------------------------------------------------------------*/
void
rimebuf_set_datalen(u16_t len)
{
PRINTF("rimebuf_set_len: len %d\n", len);
buflen = len;
}
/*---------------------------------------------------------------------------*/
void *
rimebuf_dataptr(void)
{
return (void *)(&rimebuf[bufptr + RIMEBUF_HDR_SIZE]);
}
/*---------------------------------------------------------------------------*/
void *
rimebuf_hdrptr(void)
{
return (void *)(&rimebuf[hdrptr]);
}
/*---------------------------------------------------------------------------*/
void
rimebuf_reference(void *ptr, u16_t len)
{
rimebuf_clear();
rimebufptr = ptr;
buflen = len;
}
/*---------------------------------------------------------------------------*/
int
rimebuf_is_reference(void)
{
return rimebufptr != &rimebuf[RIMEBUF_HDR_SIZE];
}
/*---------------------------------------------------------------------------*/
void *
rimebuf_reference_ptr(void)
{
return rimebufptr;
}
/*---------------------------------------------------------------------------*/
u16_t
rimebuf_datalen(void)
{
return buflen;
}
/*---------------------------------------------------------------------------*/
u8_t
rimebuf_hdrlen(void)
{
return RIMEBUF_HDR_SIZE - hdrptr;
}
/*---------------------------------------------------------------------------*/
u16_t
rimebuf_totlen(void)
{
return rimebuf_hdrlen() + rimebuf_datalen();
}
/*---------------------------------------------------------------------------*/
/** @} */