/*
* Copyright (c) 2004, 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 uIP TCP/IP stack
*
* Author: Adam Dunkels <adam@sics.se>
*
* $Id: psock.c,v 1.2 2007-09-01 18:06:13 patacongo Exp $
*/
#include <stdio.h>
#include <string.h>
#include <pthread.h>
#include <debug.h>
#include <net/uip/uip.h>
#include <net/uip/uipopt.h>
#include <net/uip/psock.h>
#define STATE_NONE 0
#define STATE_ACKED 1
#define STATE_READ 2
#define STATE_BLOCKED_NEWDATA 3
#define STATE_BLOCKED_CLOSE 4
#define STATE_BLOCKED_SEND 5
#define STATE_DATA_SENT 6
/*
* Return value of the buffering functions that indicates that a
* buffer was not filled by incoming data.
*
*/
#define BUF_NOT_FULL 0
#define BUF_NOT_FOUND 0
/*
* Return value of the buffering functions that indicates that a
* buffer was completely filled by incoming data.
*
*/
#define BUF_FULL 1
/*
* Return value of the buffering functions that indicates that an
* end-marker byte was found.
*
*/
#define BUF_FOUND 2
static void buf_setup(struct psock_buf *buf, uint8 *bufptr, uint16 bufsize)
{
buf->ptr = bufptr;
buf->left = bufsize;
}
static uint8 buf_bufdata(struct psock_buf *buf, uint16 len, uint8 **dataptr, uint16 *datalen)
{
if (*datalen < buf->left)
{
memcpy(buf->ptr, *dataptr, *datalen);
buf->ptr += *datalen;
buf->left -= *datalen;
*dataptr += *datalen;
*datalen = 0;
return BUF_NOT_FULL;
}
else if (*datalen == buf->left)
{
memcpy(buf->ptr, *dataptr, *datalen);
buf->ptr += *datalen;
buf->left = 0;
*dataptr += *datalen;
*datalen = 0;
return BUF_FULL;
}
else
{
memcpy(buf->ptr, *dataptr, buf->left);
buf->ptr += buf->left;
*datalen -= buf->left;
*dataptr += buf->left;
buf->left = 0;
return BUF_FULL;
}
}
static uint8 buf_bufto(struct psock_buf *buf, uint8 endmarker, uint8 **dataptr, uint16 *datalen)
{
uint8 c;
while(buf->left > 0 && *datalen > 0)
{
c = *buf->ptr = **dataptr;
++*dataptr;
++buf->ptr;
--*datalen;
--buf->left;
if (c == endmarker)
{
return BUF_FOUND;
}
}
if (*datalen == 0)
{
return BUF_NOT_FOUND;
}
while(*datalen > 0)
{
c = **dataptr;
--*datalen;
++*dataptr;
if (c == endmarker)
{
return BUF_FOUND | BUF_FULL;
}
}
return BUF_FULL;
}
static boolean send_data(register struct psock *s)
{
/* Inidicate that we are blocked waiting for the send to complete */
s->state = STATE_BLOCKED_SEND;
/* Loop until we successfully send the data */
for (;;)
{
/* If the data has not been sent OR if it needs to be retransmitted,
* then send it now.
*/
if (s->state != STATE_DATA_SENT || uip_rexmit())
{
if (s->sendlen > uip_mss())
{
uip_send(s->sendptr, uip_mss());
}
else
{
uip_send(s->sendptr, s->sendlen);
}
s->state = STATE_DATA_SENT;
}
/* Check if all data has been sent and acknowledged */
if (s->state == STATE_DATA_SENT && uip_acked())
{
/* Yes.. the data has been sent AND acknowledge */
if (s->sendlen > uip_mss())
{
s->sendlen -= uip_mss();
s->sendptr += uip_mss();
}
else
{
s->sendptr += s->sendlen;
s->sendlen = 0;
}
s->state = STATE_ACKED;
return TRUE;
}
/* No.. then wait on the retransmit or acked events */
(void)uip_event_wait(UIP_ACKDATA|UIP_REXMIT);
}
return FALSE; /* We never get here */
}
void psock_send(struct psock *s, const char *buf, unsigned int len)
{
/* If there is no data to send, we exit immediately. */
if (len > 0)
{
/* Save the length of and a pointer to the data that is to be sent. */
s->sendptr = (const uint8*)buf;
s->sendlen = len;
s->state = STATE_NONE;
/* Loop here until all data is sent. The s->sendlen variable is updated
* by the data_sent() function.
*/
while(s->sendlen > 0) {
/* Wait until the data has been sent and acknowledged */
send_data(s);
}
/* Done */
s->state = STATE_NONE;
}
}
void psock_generator_send(register struct psock *s, unsigned short (*generate)(void *), void *arg)
{
/* Ensure that there is a generator function to call. */
if (generate != NULL)
{
/* Call the generator function to generate the data in the uip_appdata
* buffer.
*/
s->sendlen = generate(arg);
s->sendptr = uip_appdata;
s->state = STATE_NONE;
do
{
/* Call the generator function again if we are called to perform a
* retransmission.
*/
if (uip_rexmit())
{
generate(arg);
}
/* Wait until all data is sent and acknowledged. */
send_data(s);
}
while(s->sendlen > 0);
/* Done */
s->state = STATE_NONE;
}
}
uint16 psock_datalen(struct psock *psock)
{
return psock->bufsize - psock->buf.left;
}
boolean psock_checknewdata(struct psock *s)
{
if (s->readlen > 0)
{
/* There is data in the uip_appdata buffer that has not yet been read
* with the PSOCK_READ functions.
*/
return TRUE;
}
else if (s->state == STATE_READ)
{
/* All data in uip_appdata buffer already consumed. */
s->state = STATE_BLOCKED_NEWDATA;
return FALSE;
}
else if (uip_newdata())
{
/* There is new data that has not been consumed. */
return TRUE;
}
else
{
/* There is no new data. */
return FALSE;
}
}
void psock_waitnewdata(struct psock *s)
{
while (!psock_checknewdata(s))
{
uip_event_wait(UIP_NEWDATA);
}
}
void psock_readto(register struct psock *psock, unsigned char c)
{
restart:
buf_setup(&psock->buf, psock->bufptr, psock->bufsize);
/* XXX: Should add buf_checkmarker() before do{} loop, if
incoming data has been handled while waiting for a write. */
do
{
if (psock->readlen == 0)
{
psock_waitnewdata(psock);
psock->state = STATE_READ;
psock->readptr = (uint8 *)uip_appdata;
psock->readlen = uip_datalen();
}
}
while((buf_bufto(&psock->buf, c, &psock->readptr, &psock->readlen) & BUF_FOUND) == 0);
if (psock_datalen(psock) == 0)
{
psock->state = STATE_NONE;
goto restart;
}
}
void psock_readbuf(register struct psock *psock)
{
restart:
buf_setup(&psock->buf, psock->bufptr, psock->bufsize);
/* XXX: Should add buf_checkmarker() before do{} loop, if
incoming data has been handled while waiting for a write. */
do
{
if (psock->readlen == 0)
{
psock_waitnewdata(psock);
dbg("Waited for newdata\n");
psock->state = STATE_READ;
psock->readptr = (uint8 *)uip_appdata;
psock->readlen = uip_datalen();
}
}
while(buf_bufdata(&psock->buf, psock->bufsize, &psock->readptr, &psock->readlen) != BUF_FULL);
if (psock_datalen(psock) == 0)
{
psock->state = STATE_NONE;
goto restart;
}
}
void psock_init(register struct psock *psock, char *buffer, unsigned int buffersize)
{
psock->state = STATE_NONE;
psock->readlen = 0;
psock->bufptr = (uint8*)buffer;
psock->bufsize = buffersize;
buf_setup(&psock->buf, (uint8*)buffer, buffersize);
}
