Diff: EMAC/uIP/uip/psock.c

Revision:

0:bf7b9fba3924

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/EMAC/uIP/uip/psock.c	Sun Mar 20 05:38:56 2011 +0000
@@ -0,0 +1,339 @@
+/*
+ * 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 2006/06/12 08:00:30 adam 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 = (unsigned char*)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, (unsigned char*)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, (unsigned char * ) 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, (unsigned char*) buffer, buffersize);
+  PT_INIT(&psock->pt);
+  PT_INIT(&psock->psockpt);
+}
+/*---------------------------------------------------------------------------*/