+++ /dev/null
-/*
- * 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)
-{
- 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 = 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, 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, 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, buffer, buffersize);
- PT_INIT(&psock->pt);
- PT_INIT(&psock->psockpt);
-}
-/*---------------------------------------------------------------------------*/
projects / pub / lufa.git / blobdiff