2 * Copyright (c) 2004, Swedish Institute of Computer Science.
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3 * All rights reserved.
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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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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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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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29 * This file is part of the uIP TCP/IP stack
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31 * Author: Adam Dunkels <adam@sics.se>
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33 * $Id: psock.c,v 1.1 2007/01/04 11:06:40 adamdunkels Exp $
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42 #define STATE_NONE 0
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43 #define STATE_ACKED 1
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44 #define STATE_READ 2
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45 #define STATE_BLOCKED_NEWDATA 3
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46 #define STATE_BLOCKED_CLOSE 4
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47 #define STATE_BLOCKED_SEND 5
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48 #define STATE_DATA_SENT 6
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51 * Return value of the buffering functions that indicates that a
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52 * buffer was not filled by incoming data.
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55 #define BUF_NOT_FULL 0
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56 #define BUF_NOT_FOUND 0
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59 * Return value of the buffering functions that indicates that a
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60 * buffer was completely filled by incoming data.
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66 * Return value of the buffering functions that indicates that an
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67 * end-marker byte was found.
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72 /*---------------------------------------------------------------------------*/
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73 static void buf_setup( struct psock_buf *buf, u8_t *bufptr, u16_t bufsize )
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76 buf->left = bufsize;
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79 /*---------------------------------------------------------------------------*/
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80 static u8_t buf_bufdata( struct psock_buf *buf, u16_t len, u8_t **dataptr, u16_t *datalen )
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84 if( *datalen < buf->left )
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86 memcpy( buf->ptr, *dataptr, *datalen );
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87 buf->ptr += *datalen;
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88 buf->left -= *datalen;
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89 *dataptr += *datalen;
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91 return BUF_NOT_FULL;
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93 else if( *datalen == buf->left )
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95 memcpy( buf->ptr, *dataptr, *datalen );
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96 buf->ptr += *datalen;
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98 *dataptr += *datalen;
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104 memcpy( buf->ptr, *dataptr, buf->left );
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105 buf->ptr += buf->left;
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106 *datalen -= buf->left;
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107 *dataptr += buf->left;
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113 /*---------------------------------------------------------------------------*/
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114 static u8_t buf_bufto( register struct psock_buf *buf, u8_t endmarker, register u8_t **dataptr, register u16_t *datalen )
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117 while( buf->left > 0 && *datalen > 0 )
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119 c = *buf->ptr = **dataptr;
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125 if( c == endmarker )
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131 if( *datalen == 0 )
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133 return BUF_NOT_FOUND;
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136 while( *datalen > 0 )
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142 if( c == endmarker )
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144 return BUF_FOUND | BUF_FULL;
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151 /*---------------------------------------------------------------------------*/
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152 static char send_data( register struct psock *s )
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154 if( s->state != STATE_DATA_SENT || uip_rexmit() )
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156 if( s->sendlen > uip_mss() )
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158 uip_send( s->sendptr, uip_mss() );
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162 uip_send( s->sendptr, s->sendlen );
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165 s->state = STATE_DATA_SENT;
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172 /*---------------------------------------------------------------------------*/
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173 static char data_acked( register struct psock *s )
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175 if( s->state == STATE_DATA_SENT && uip_acked() )
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177 if( s->sendlen > uip_mss() )
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179 s->sendlen -= uip_mss();
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180 s->sendptr += uip_mss();
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184 s->sendptr += s->sendlen;
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188 s->state = STATE_ACKED;
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195 /*---------------------------------------------------------------------------*/
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196 PT_THREAD( psock_send ( register struct psock *s, const char *buf, unsigned int len ) )
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198 PT_BEGIN( &s->psockpt );
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200 /* If there is no data to send, we exit immediately. */
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203 PT_EXIT( &s->psockpt );
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206 /* Save the length of and a pointer to the data that is to be
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208 s->sendptr = ( u8_t * ) buf;
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211 s->state = STATE_NONE;
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213 /* We loop here until all data is sent. The s->sendlen variable is
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214 updated by the data_sent() function. */
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215 while( s->sendlen > 0 )
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218 * The condition for this PT_WAIT_UNTIL is a little tricky: the
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219 * protothread will wait here until all data has been acknowledged
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220 * (data_acked() returns true) and until all data has been sent
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221 * (send_data() returns true). The two functions data_acked() and
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222 * send_data() must be called in succession to ensure that all
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223 * data is sent. Therefore the & operator is used instead of the
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224 * && operator, which would cause only the data_acked() function
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225 * to be called when it returns false.
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227 PT_WAIT_UNTIL( &s->psockpt, data_acked(s) & send_data(s) );
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230 s->state = STATE_NONE;
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232 PT_END( &s->psockpt );
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235 /*---------------------------------------------------------------------------*/
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236 PT_THREAD( psock_generator_send ( register struct psock *s, unsigned short ( *generate ) ( void * ), void *arg ) )
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238 PT_BEGIN( &s->psockpt );
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240 /* Ensure that there is a generator function to call. */
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241 if( generate == NULL )
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243 PT_EXIT( &s->psockpt );
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246 /* Call the generator function to generate the data in the
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247 uip_appdata buffer. */
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248 s->sendlen = generate( arg );
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249 s->sendptr = uip_appdata;
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251 s->state = STATE_NONE;
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254 /* Call the generator function again if we are called to perform a
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261 /* Wait until all data is sent and acknowledged. */
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262 PT_WAIT_UNTIL( &s->psockpt, data_acked(s) & send_data(s) );
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263 } while( s->sendlen > 0 );
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265 s->state = STATE_NONE;
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267 PT_END( &s->psockpt );
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270 /*---------------------------------------------------------------------------*/
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271 u16_t psock_datalen( struct psock *psock )
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273 return psock->bufsize - psock->buf.left;
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276 /*---------------------------------------------------------------------------*/
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277 char psock_newdata( struct psock *s )
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279 if( s->readlen > 0 )
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281 /* There is data in the uip_appdata buffer that has not yet been
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282 read with the PSOCK_READ functions. */
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285 else if( s->state == STATE_READ )
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287 /* All data in uip_appdata buffer already consumed. */
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288 s->state = STATE_BLOCKED_NEWDATA;
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291 else if( uip_newdata() )
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293 /* There is new data that has not been consumed. */
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298 /* There is no new data. */
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303 /*---------------------------------------------------------------------------*/
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304 PT_THREAD( psock_readto ( register struct psock *psock, unsigned char c ) )
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306 PT_BEGIN( &psock->psockpt );
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308 buf_setup( &psock->buf, ( u8_t * ) psock->bufptr, psock->bufsize );
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310 /* XXX: Should add buf_checkmarker() before do{} loop, if
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311 incoming data has been handled while waiting for a write. */
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314 if( psock->readlen == 0 )
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316 PT_WAIT_UNTIL( &psock->psockpt, psock_newdata(psock) );
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317 psock->state = STATE_READ;
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318 psock->readptr = ( u8_t * ) uip_appdata;
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319 psock->readlen = uip_datalen();
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321 } while( (buf_bufto(&psock->buf, c, &psock->readptr, &psock->readlen) & BUF_FOUND) == 0 );
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323 if( psock_datalen(psock) == 0 )
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325 psock->state = STATE_NONE;
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326 PT_RESTART( &psock->psockpt );
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329 PT_END( &psock->psockpt );
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332 /*---------------------------------------------------------------------------*/
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333 PT_THREAD( psock_readbuf ( register struct psock *psock ) )
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335 PT_BEGIN( &psock->psockpt );
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337 buf_setup( &psock->buf, ( u8_t * ) psock->bufptr, psock->bufsize );
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339 /* XXX: Should add buf_checkmarker() before do{} loop, if
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340 incoming data has been handled while waiting for a write. */
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343 if( psock->readlen == 0 )
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345 PT_WAIT_UNTIL( &psock->psockpt, psock_newdata(psock) );
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346 printf( "Waited for newdata\n" );
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347 psock->state = STATE_READ;
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348 psock->readptr = ( u8_t * ) uip_appdata;
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349 psock->readlen = uip_datalen();
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351 } while( buf_bufdata(&psock->buf, psock->bufsize, &psock->readptr, &psock->readlen) != BUF_FULL );
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353 if( psock_datalen(psock) == 0 )
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355 psock->state = STATE_NONE;
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356 PT_RESTART( &psock->psockpt );
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359 PT_END( &psock->psockpt );
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362 /*---------------------------------------------------------------------------*/
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363 void psock_init( register struct psock *psock, char *buffer, unsigned int buffersize )
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365 psock->state = STATE_NONE;
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366 psock->readlen = 0;
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367 psock->bufptr = buffer;
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368 psock->bufsize = buffersize;
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369 buf_setup( &psock->buf, ( u8_t * ) buffer, buffersize );
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370 PT_INIT( &psock->pt );
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371 PT_INIT( &psock->psockpt );
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374 /*---------------------------------------------------------------------------*/
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