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/*

 * 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 2 2011-07-17 20:13:17Z filepang@gmail.com $

 */

#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 = ( u8_t * ) 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, ( u8_t * ) 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, ( u8_t * ) 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, ( u8_t * ) buffer, buffersize );

        PT_INIT( &psock->pt );

        PT_INIT( &psock->psockpt );

}

/*---------------------------------------------------------------------------*/