320 lines
9.2 KiB
C
320 lines
9.2 KiB
C
/*
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* Copyright (c) 2004, Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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* Author: Adam Dunkels <adam@sics.se>
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*
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*/
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#include <string.h>
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#include "net/ipv6/psock.h"
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#define STATE_NONE 0
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#define STATE_ACKED 1
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#define STATE_READ 2
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#define STATE_BLOCKED_NEWDATA 3
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#define STATE_BLOCKED_CLOSE 4
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#define STATE_BLOCKED_SEND 5
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#define STATE_DATA_SENT 6
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/*
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* Return value of the buffering functions that indicates that a
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* buffer was not filled by incoming data.
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*
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*/
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#define BUF_NOT_FULL 0
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#define BUF_NOT_FOUND 0
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/*
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* Return value of the buffering functions that indicates that a
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* buffer was completely filled by incoming data.
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*
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*/
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#define BUF_FULL 1
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/*
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* Return value of the buffering functions that indicates that an
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* end-marker byte was found.
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*
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*/
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#define BUF_FOUND 2
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/*---------------------------------------------------------------------------*/
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static void
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buf_setup(struct psock_buf *buf,
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uint8_t *bufptr, uint16_t bufsize)
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{
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buf->ptr = bufptr;
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buf->left = bufsize;
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}
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/*---------------------------------------------------------------------------*/
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static uint8_t
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buf_bufdata(struct psock_buf *buf, uint16_t len,
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uint8_t **dataptr, uint16_t *datalen)
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{
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if(*datalen < buf->left) {
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memcpy(buf->ptr, *dataptr, *datalen);
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buf->ptr += *datalen;
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buf->left -= *datalen;
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*dataptr += *datalen;
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*datalen = 0;
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return BUF_NOT_FULL;
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} else if(*datalen == buf->left) {
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memcpy(buf->ptr, *dataptr, *datalen);
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buf->ptr += *datalen;
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buf->left = 0;
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*dataptr += *datalen;
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*datalen = 0;
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return BUF_FULL;
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} else {
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memcpy(buf->ptr, *dataptr, buf->left);
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buf->ptr += buf->left;
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*datalen -= buf->left;
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*dataptr += buf->left;
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buf->left = 0;
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return BUF_FULL;
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}
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}
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/*---------------------------------------------------------------------------*/
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static uint8_t
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buf_bufto(CC_REGISTER_ARG struct psock_buf *buf, uint8_t endmarker,
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CC_REGISTER_ARG uint8_t **dataptr, CC_REGISTER_ARG uint16_t *datalen)
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{
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uint8_t c;
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while(buf->left > 0 && *datalen > 0) {
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c = *buf->ptr = **dataptr;
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++*dataptr;
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++buf->ptr;
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--*datalen;
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--buf->left;
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if(c == endmarker) {
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return BUF_FOUND;
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}
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}
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if(*datalen == 0) {
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return BUF_NOT_FOUND;
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}
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return BUF_FULL;
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}
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/*---------------------------------------------------------------------------*/
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static char
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data_is_sent_and_acked(CC_REGISTER_ARG struct psock *s)
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{
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/* If data has previously been sent, and the data has been acked, we
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increase the send pointer and call send_data() to send more
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data. */
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if(s->state != STATE_DATA_SENT || uip_rexmit()) {
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if(s->sendlen > uip_mss()) {
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uip_send(s->sendptr, uip_mss());
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} else {
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uip_send(s->sendptr, s->sendlen);
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}
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s->state = STATE_DATA_SENT;
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return 0;
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} else if(s->state == STATE_DATA_SENT && uip_acked()) {
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if(s->sendlen > uip_mss()) {
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s->sendlen -= uip_mss();
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s->sendptr += uip_mss();
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} else {
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s->sendptr += s->sendlen;
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s->sendlen = 0;
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}
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s->state = STATE_ACKED;
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return 1;
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}
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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PT_THREAD(psock_send(CC_REGISTER_ARG struct psock *s, const uint8_t *buf,
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unsigned int len))
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{
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PT_BEGIN(&s->psockpt);
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/* If there is no data to send, we exit immediately. */
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if(len == 0) {
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PT_EXIT(&s->psockpt);
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}
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/* Save the length of and a pointer to the data that is to be
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sent. */
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s->sendptr = buf;
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s->sendlen = len;
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s->state = STATE_NONE;
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/* We loop here until all data is sent. The s->sendlen variable is
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updated by the data_sent() function. */
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while(s->sendlen > 0) {
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/*
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* The protothread will wait here until all data has been
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* acknowledged and sent (data_is_acked_and_send() returns 1).
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*/
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PT_WAIT_UNTIL(&s->psockpt, data_is_sent_and_acked(s));
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}
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s->state = STATE_NONE;
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PT_END(&s->psockpt);
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}
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/*---------------------------------------------------------------------------*/
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PT_THREAD(psock_generator_send(CC_REGISTER_ARG struct psock *s,
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unsigned short (*generate)(void *), void *arg))
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{
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PT_BEGIN(&s->psockpt);
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/* Ensure that there is a generator function to call. */
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if(generate == NULL) {
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PT_EXIT(&s->psockpt);
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}
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s->state = STATE_NONE;
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do {
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/* Call the generator function to generate the data in the
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uip_appdata buffer. */
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s->sendlen = generate(arg);
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s->sendptr = uip_appdata;
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if(s->sendlen > uip_mss()) {
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uip_send(s->sendptr, uip_mss());
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} else {
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uip_send(s->sendptr, s->sendlen);
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}
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s->state = STATE_DATA_SENT;
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/* Wait until all data is sent and acknowledged. */
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// if (!s->sendlen) break; //useful debugging aid
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PT_YIELD_UNTIL(&s->psockpt, uip_acked() || uip_rexmit());
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} while(!uip_acked());
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s->state = STATE_NONE;
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PT_END(&s->psockpt);
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}
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/*---------------------------------------------------------------------------*/
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uint16_t
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psock_datalen(struct psock *psock)
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{
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return psock->bufsize - psock->buf.left;
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}
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/*---------------------------------------------------------------------------*/
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char
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psock_newdata(struct psock *s)
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{
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if(s->readlen > 0) {
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/* There is data in the uip_appdata buffer that has not yet been
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read with the PSOCK_READ functions. */
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return 1;
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} else if(s->state == STATE_READ) {
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/* All data in uip_appdata buffer already consumed. */
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s->state = STATE_BLOCKED_NEWDATA;
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return 0;
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} else if(uip_newdata()) {
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/* There is new data that has not been consumed. */
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return 1;
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} else {
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/* There is no new data. */
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return 0;
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}
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}
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/*---------------------------------------------------------------------------*/
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PT_THREAD(psock_readto(CC_REGISTER_ARG struct psock *psock, unsigned char c))
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{
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PT_BEGIN(&psock->psockpt);
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buf_setup(&psock->buf, psock->bufptr, psock->bufsize);
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/* XXX: Should add buf_checkmarker() before do{} loop, if
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incoming data has been handled while waiting for a write. */
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do {
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if(psock->readlen == 0) {
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PT_WAIT_UNTIL(&psock->psockpt, psock_newdata(psock));
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psock->state = STATE_READ;
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psock->readptr = (uint8_t *)uip_appdata;
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psock->readlen = uip_datalen();
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}
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} while(buf_bufto(&psock->buf, c,
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&psock->readptr,
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&psock->readlen) == BUF_NOT_FOUND);
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if(psock_datalen(psock) == 0) {
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psock->state = STATE_NONE;
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PT_RESTART(&psock->psockpt);
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}
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PT_END(&psock->psockpt);
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}
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/*---------------------------------------------------------------------------*/
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PT_THREAD(psock_readbuf_len(CC_REGISTER_ARG struct psock *psock, uint16_t len))
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{
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PT_BEGIN(&psock->psockpt);
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buf_setup(&psock->buf, psock->bufptr, psock->bufsize);
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/* XXX: Should add buf_checkmarker() before do{} loop, if
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incoming data has been handled while waiting for a write. */
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/* read len bytes or to end of data */
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do {
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if(psock->readlen == 0) {
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PT_WAIT_UNTIL(&psock->psockpt, psock_newdata(psock));
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psock->state = STATE_READ;
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psock->readptr = (uint8_t *)uip_appdata;
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psock->readlen = uip_datalen();
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}
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} while(buf_bufdata(&psock->buf, psock->bufsize,
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&psock->readptr, &psock->readlen) == BUF_NOT_FULL &&
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psock_datalen(psock) < len);
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if(psock_datalen(psock) == 0) {
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psock->state = STATE_NONE;
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PT_RESTART(&psock->psockpt);
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}
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PT_END(&psock->psockpt);
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}
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/*---------------------------------------------------------------------------*/
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void
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psock_init(CC_REGISTER_ARG struct psock *psock,
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uint8_t *buffer, unsigned int buffersize)
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{
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psock->state = STATE_NONE;
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psock->readlen = 0;
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psock->bufptr = buffer;
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psock->bufsize = buffersize;
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buf_setup(&psock->buf, buffer, buffersize);
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PT_INIT(&psock->pt);
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PT_INIT(&psock->psockpt);
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}
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/*---------------------------------------------------------------------------*/
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