Add FreeRTOS-Plus directory.

FreeRTOS/Demo/Common/ethernet/FreeRTOS-uIP/psock.c

@@ -0,0 +1,374 @@
+/*
+ * 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 );
+}
+
+/*---------------------------------------------------------------------------*/