/* | |
* 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 1.1 2007/01/04 11:06:40 adamdunkels Exp $ | |
*/ | |
#include <stdio.h> | |
#include <string.h> | |
#include "uipopt.h" | |
#include "psock.h" | |
#include "uip.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, u8_t *bufptr, u16_t bufsize ) | |
{ | |
buf->ptr = bufptr; | |
buf->left = bufsize; | |
} | |
/*---------------------------------------------------------------------------*/ | |
static u8_t buf_bufdata( struct psock_buf *buf, u16_t len, u8_t **dataptr, u16_t *datalen ) | |
{ | |
( void ) len; | |
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 u8_t buf_bufto( register struct psock_buf *buf, u8_t endmarker, register u8_t **dataptr, register u16_t *datalen ) | |
{ | |
u8_t 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 char send_data( register struct psock *s ) | |
{ | |
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; | |
return 1; | |
} | |
return 0; | |
} | |
/*---------------------------------------------------------------------------*/ | |
static char data_acked( register struct psock *s ) | |
{ | |
if( s->state == STATE_DATA_SENT && uip_acked() ) | |
{ | |
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 1; | |
} | |
return 0; | |
} | |
/*---------------------------------------------------------------------------*/ | |
PT_THREAD( psock_send ( register struct psock *s, const char *buf, unsigned int len ) ) | |
{ | |
PT_BEGIN( &s->psockpt ); | |
/* If there is no data to send, we exit immediately. */ | |
if( len == 0 ) | |
{ | |
PT_EXIT( &s->psockpt ); | |
} | |
/* Save the length of and a pointer to the data that is to be | |
sent. */ | |
s->sendptr = ( u8_t * ) buf; | |
s->sendlen = len; | |
s->state = STATE_NONE; | |
/* We loop here until all data is sent. The s->sendlen variable is | |
updated by the data_sent() function. */ | |
while( s->sendlen > 0 ) | |
{ | |
/* | |
* The condition for this PT_WAIT_UNTIL is a little tricky: the | |
* protothread will wait here until all data has been acknowledged | |
* (data_acked() returns true) and until all data has been sent | |
* (send_data() returns true). The two functions data_acked() and | |
* send_data() must be called in succession to ensure that all | |
* data is sent. Therefore the & operator is used instead of the | |
* && operator, which would cause only the data_acked() function | |
* to be called when it returns false. | |
*/ | |
PT_WAIT_UNTIL( &s->psockpt, data_acked(s) & send_data(s) ); | |
} | |
s->state = STATE_NONE; | |
PT_END( &s->psockpt ); | |
} | |
/*---------------------------------------------------------------------------*/ | |
PT_THREAD( psock_generator_send ( register struct psock *s, unsigned short ( *generate ) ( void * ), void *arg ) ) | |
{ | |
PT_BEGIN( &s->psockpt ); | |
/* Ensure that there is a generator function to call. */ | |
if( generate == NULL ) | |
{ | |
PT_EXIT( &s->psockpt ); | |
} | |
/* 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. */ | |
PT_WAIT_UNTIL( &s->psockpt, data_acked(s) & send_data(s) ); | |
} while( s->sendlen > 0 ); | |
s->state = STATE_NONE; | |
PT_END( &s->psockpt ); | |
} | |
/*---------------------------------------------------------------------------*/ | |
u16_t psock_datalen( struct psock *psock ) | |
{ | |
return psock->bufsize - psock->buf.left; | |
} | |
/*---------------------------------------------------------------------------*/ | |
char psock_newdata( 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 1; | |
} | |
else if( s->state == STATE_READ ) | |
{ | |
/* All data in uip_appdata buffer already consumed. */ | |
s->state = STATE_BLOCKED_NEWDATA; | |
return 0; | |
} | |
else if( uip_newdata() ) | |
{ | |
/* There is new data that has not been consumed. */ | |
return 1; | |
} | |
else | |
{ | |
/* There is no new data. */ | |
return 0; | |
} | |
} | |
/*---------------------------------------------------------------------------*/ | |
PT_THREAD( psock_readto ( register struct psock *psock, unsigned char c ) ) | |
{ | |
PT_BEGIN( &psock->psockpt ); | |
buf_setup( &psock->buf, ( u8_t * ) 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 ) | |
{ | |
PT_WAIT_UNTIL( &psock->psockpt, psock_newdata(psock) ); | |
psock->state = STATE_READ; | |
psock->readptr = ( u8_t * ) 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; | |
PT_RESTART( &psock->psockpt ); | |
} | |
PT_END( &psock->psockpt ); | |
} | |
/*---------------------------------------------------------------------------*/ | |
PT_THREAD( psock_readbuf ( register struct psock *psock ) ) | |
{ | |
PT_BEGIN( &psock->psockpt ); | |
buf_setup( &psock->buf, ( u8_t * ) 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 ) | |
{ | |
PT_WAIT_UNTIL( &psock->psockpt, psock_newdata(psock) ); | |
printf( "Waited for newdata\n" ); | |
psock->state = STATE_READ; | |
psock->readptr = ( u8_t * ) 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; | |
PT_RESTART( &psock->psockpt ); | |
} | |
PT_END( &psock->psockpt ); | |
} | |
/*---------------------------------------------------------------------------*/ | |
void psock_init( register struct psock *psock, char *buffer, unsigned int buffersize ) | |
{ | |
psock->state = STATE_NONE; | |
psock->readlen = 0; | |
psock->bufptr = buffer; | |
psock->bufsize = buffersize; | |
buf_setup( &psock->buf, ( u8_t * ) buffer, buffersize ); | |
PT_INIT( &psock->pt ); | |
PT_INIT( &psock->psockpt ); | |
} | |
/*---------------------------------------------------------------------------*/ |