1 | /*
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2 | * Copyright (c) 2004, Swedish Institute of Computer Science.
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3 | * All rights reserved.
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4 | *
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5 | * Redistribution and use in source and binary forms, with or without
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6 | * modification, are permitted provided that the following conditions
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7 | * are met:
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8 | * 1. Redistributions of source code must retain the above copyright
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9 | * notice, this list of conditions and the following disclaimer.
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10 | * 2. Redistributions in binary form must reproduce the above copyright
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11 | * notice, this list of conditions and the following disclaimer in the
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12 | * documentation and/or other materials provided with the distribution.
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13 | * 3. Neither the name of the Institute nor the names of its contributors
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14 | * may be used to endorse or promote products derived from this software
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15 | * without specific prior written permission.
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16 | *
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17 | * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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27 | * SUCH DAMAGE.
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28 | *
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29 | * This file is part of the uIP TCP/IP stack
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30 | *
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31 | * Author: Adam Dunkels <adam@sics.se>
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32 | *
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33 | * $Id: psock.c 158 2016-02-20 13:43:32Z coas-nagasima $
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34 | */
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35 |
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36 | #include <stdio.h>
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37 | #include <string.h>
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38 |
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39 | #include "net/ip/uipopt.h"
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40 | #include "net/ip/psock.h"
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41 | #include "net/ip/uip.h"
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42 |
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43 | #define STATE_NONE 0
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44 | #define STATE_ACKED 1
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45 | #define STATE_READ 2
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46 | #define STATE_BLOCKED_NEWDATA 3
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47 | #define STATE_BLOCKED_CLOSE 4
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48 | #define STATE_BLOCKED_SEND 5
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49 | #define STATE_DATA_SENT 6
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50 |
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51 | /*
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52 | * Return value of the buffering functions that indicates that a
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53 | * buffer was not filled by incoming data.
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54 | *
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55 | */
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56 | #define BUF_NOT_FULL 0
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57 | #define BUF_NOT_FOUND 0
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58 |
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59 | /*
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60 | * Return value of the buffering functions that indicates that a
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61 | * buffer was completely filled by incoming data.
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62 | *
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63 | */
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64 | #define BUF_FULL 1
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65 |
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66 | /*
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67 | * Return value of the buffering functions that indicates that an
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68 | * end-marker byte was found.
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69 | *
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70 | */
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71 | #define BUF_FOUND 2
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72 |
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73 | /*---------------------------------------------------------------------------*/
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74 | static void
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75 | buf_setup(struct psock_buf *buf,
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76 | uint8_t *bufptr, uint16_t bufsize)
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77 | {
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78 | buf->ptr = bufptr;
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79 | buf->left = bufsize;
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80 | }
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81 | /*---------------------------------------------------------------------------*/
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82 | static uint8_t
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83 | buf_bufdata(struct psock_buf *buf, uint16_t len,
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84 | uint8_t **dataptr, uint16_t *datalen)
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85 | {
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86 | if(*datalen < buf->left) {
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87 | memcpy(buf->ptr, *dataptr, *datalen);
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88 | buf->ptr += *datalen;
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89 | buf->left -= *datalen;
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90 | *dataptr += *datalen;
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91 | *datalen = 0;
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92 | return BUF_NOT_FULL;
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93 | } else if(*datalen == buf->left) {
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94 | memcpy(buf->ptr, *dataptr, *datalen);
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95 | buf->ptr += *datalen;
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96 | buf->left = 0;
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97 | *dataptr += *datalen;
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98 | *datalen = 0;
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99 | return BUF_FULL;
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100 | } else {
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101 | memcpy(buf->ptr, *dataptr, buf->left);
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102 | buf->ptr += buf->left;
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103 | *datalen -= buf->left;
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104 | *dataptr += buf->left;
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105 | buf->left = 0;
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106 | return BUF_FULL;
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107 | }
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108 | }
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109 | /*---------------------------------------------------------------------------*/
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110 | static uint8_t
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111 | buf_bufto(register struct psock_buf *buf, uint8_t endmarker,
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112 | register uint8_t **dataptr, register uint16_t *datalen)
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113 | {
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114 | uint8_t c;
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115 | while(buf->left > 0 && *datalen > 0) {
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116 | c = *buf->ptr = **dataptr;
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117 | ++*dataptr;
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118 | ++buf->ptr;
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119 | --*datalen;
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120 | --buf->left;
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121 |
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122 | if(c == endmarker) {
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123 | return BUF_FOUND;
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124 | }
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125 | }
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126 |
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127 | if(*datalen == 0) {
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128 | return BUF_NOT_FOUND;
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129 | }
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130 |
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131 | while(*datalen > 0) {
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132 | c = **dataptr;
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133 | --*datalen;
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134 | ++*dataptr;
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135 |
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136 | if(c == endmarker) {
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137 | return BUF_FOUND | BUF_FULL;
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138 | }
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139 | }
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140 |
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141 | return BUF_FULL;
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142 | }
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143 | /*---------------------------------------------------------------------------*/
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144 | static char
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145 | send_data(register struct psock *s)
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146 | {
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147 | if(s->state != STATE_DATA_SENT || uip_rexmit()) {
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148 | if(s->sendlen > uip_mss()) {
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149 | uip_send(s->sendptr, uip_mss());
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150 | } else {
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151 | uip_send(s->sendptr, s->sendlen);
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152 | }
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153 | s->state = STATE_DATA_SENT;
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154 | return 1;
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155 | }
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156 | return 0;
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157 | }
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158 | /*---------------------------------------------------------------------------*/
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159 | static char
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160 | data_acked(register struct psock *s)
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161 | {
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162 | if(s->state == STATE_DATA_SENT && uip_acked()) {
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163 | if(s->sendlen > uip_mss()) {
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164 | s->sendlen -= uip_mss();
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165 | s->sendptr += uip_mss();
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166 | } else {
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167 | s->sendptr += s->sendlen;
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168 | s->sendlen = 0;
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169 | }
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170 | s->state = STATE_ACKED;
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171 | return 1;
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172 | }
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173 | return 0;
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174 | }
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175 | /*---------------------------------------------------------------------------*/
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176 | PT_THREAD(psock_send(register struct psock *s, const char *buf,
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177 | unsigned int len))
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178 | {
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179 | PT_BEGIN(&s->psockpt);
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180 |
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181 | /* If there is no data to send, we exit immediately. */
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182 | if(len == 0) {
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183 | PT_EXIT(&s->psockpt);
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184 | }
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185 |
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186 | /* Save the length of and a pointer to the data that is to be
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187 | sent. */
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188 | s->sendptr = buf;
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189 | s->sendlen = len;
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190 |
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191 | s->state = STATE_NONE;
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192 |
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193 | /* We loop here until all data is sent. The s->sendlen variable is
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194 | updated by the data_sent() function. */
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195 | while(s->sendlen > 0) {
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196 |
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197 | /*
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198 | * The condition for this PT_WAIT_UNTIL is a little tricky: the
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199 | * protothread will wait here until all data has been acknowledged
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200 | * (data_acked() returns true) and until all data has been sent
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201 | * (send_data() returns true). The two functions data_acked() and
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202 | * send_data() must be called in succession to ensure that all
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203 | * data is sent. Therefore the & operator is used instead of the
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204 | * && operator, which would cause only the data_acked() function
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205 | * to be called when it returns false.
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206 | */
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207 | PT_WAIT_UNTIL(&s->psockpt, data_acked(s) & send_data(s));
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208 | }
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209 |
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210 | s->state = STATE_NONE;
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211 |
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212 | PT_END(&s->psockpt);
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213 | }
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214 | /*---------------------------------------------------------------------------*/
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215 | PT_THREAD(psock_generator_send(register struct psock *s,
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216 | unsigned short (*generate)(void *), void *arg))
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217 | {
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218 | PT_BEGIN(&s->psockpt);
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219 |
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220 | /* Ensure that there is a generator function to call. */
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221 | if(generate == NULL) {
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222 | PT_EXIT(&s->psockpt);
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223 | }
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224 |
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225 | /* Call the generator function to generate the data in the
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226 | uip_appdata buffer. */
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227 | s->sendlen = generate(arg);
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228 | s->sendptr = uip_appdata;
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229 |
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230 | s->state = STATE_NONE;
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231 | do {
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232 | /* Call the generator function again if we are called to perform a
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233 | retransmission. */
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234 | if(uip_rexmit()) {
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235 | generate(arg);
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236 | }
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237 | /* Wait until all data is sent and acknowledged. */
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238 | PT_WAIT_UNTIL(&s->psockpt, data_acked(s) & send_data(s));
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239 | } while(s->sendlen > 0);
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240 |
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241 | s->state = STATE_NONE;
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242 |
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243 | PT_END(&s->psockpt);
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244 | }
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245 | /*---------------------------------------------------------------------------*/
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246 | uint16_t
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247 | psock_datalen(struct psock *psock)
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248 | {
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249 | return psock->bufsize - psock->buf.left;
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250 | }
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251 | /*---------------------------------------------------------------------------*/
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252 | char
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253 | psock_newdata(struct psock *s)
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254 | {
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255 | if(s->readlen > 0) {
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256 | /* There is data in the uip_appdata buffer that has not yet been
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257 | read with the PSOCK_READ functions. */
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258 | return 1;
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259 | } else if(s->state == STATE_READ) {
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260 | /* All data in uip_appdata buffer already consumed. */
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261 | s->state = STATE_BLOCKED_NEWDATA;
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262 | return 0;
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263 | } else if(uip_newdata()) {
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264 | /* There is new data that has not been consumed. */
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265 | return 1;
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266 | } else {
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267 | /* There is no new data. */
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268 | return 0;
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269 | }
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270 | }
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271 | /*---------------------------------------------------------------------------*/
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272 | PT_THREAD(psock_readto(register struct psock *psock, unsigned char c))
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273 | {
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274 | PT_BEGIN(&psock->psockpt);
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275 |
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276 | buf_setup(&psock->buf, psock->bufptr, psock->bufsize);
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277 |
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278 | /* XXX: Should add buf_checkmarker() before do{} loop, if
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279 | incoming data has been handled while waiting for a write. */
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280 |
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281 | do {
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282 | if(psock->readlen == 0) {
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283 | PT_WAIT_UNTIL(&psock->psockpt, psock_newdata(psock));
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284 | psock->state = STATE_READ;
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285 | psock->readptr = (uint8_t *)uip_appdata;
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286 | psock->readlen = uip_datalen();
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287 | }
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288 | } while((buf_bufto(&psock->buf, c,
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289 | &psock->readptr,
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290 | &psock->readlen) & BUF_FOUND) == 0);
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291 |
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292 | if(psock_datalen(psock) == 0) {
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293 | psock->state = STATE_NONE;
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294 | PT_RESTART(&psock->psockpt);
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295 | }
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296 | PT_END(&psock->psockpt);
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297 | }
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298 | /*---------------------------------------------------------------------------*/
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299 | PT_THREAD(psock_readbuf(register struct psock *psock))
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300 | {
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301 | PT_BEGIN(&psock->psockpt);
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302 |
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303 | buf_setup(&psock->buf, psock->bufptr, psock->bufsize);
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304 |
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305 | /* XXX: Should add buf_checkmarker() before do{} loop, if
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306 | incoming data has been handled while waiting for a write. */
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307 |
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308 | do {
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309 | if(psock->readlen == 0) {
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310 | PT_WAIT_UNTIL(&psock->psockpt, psock_newdata(psock));
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311 | printf("Waited for newdata\n");
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312 | psock->state = STATE_READ;
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313 | psock->readptr = (uint8_t *)uip_appdata;
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314 | psock->readlen = uip_datalen();
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315 | }
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316 | } while(buf_bufdata(&psock->buf, psock->bufsize,
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317 | &psock->readptr,
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318 | &psock->readlen) != BUF_FULL);
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319 |
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320 | if(psock_datalen(psock) == 0) {
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321 | psock->state = STATE_NONE;
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322 | PT_RESTART(&psock->psockpt);
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323 | }
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324 | PT_END(&psock->psockpt);
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325 | }
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326 | /*---------------------------------------------------------------------------*/
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327 | void
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328 | psock_init(register struct psock *psock, char *buffer, unsigned int buffersize)
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329 | {
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330 | psock->state = STATE_NONE;
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331 | psock->readlen = 0;
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332 | psock->bufptr = buffer;
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333 | psock->bufsize = buffersize;
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334 | buf_setup(&psock->buf, buffer, buffersize);
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335 | PT_INIT(&psock->pt);
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336 | PT_INIT(&psock->psockpt);
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337 | }
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338 | /*---------------------------------------------------------------------------*/
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