text: //==========================================================================
  //####ECOSGPLCOPYRIGHTBEGIN####
  // -------------------------------------------
  // This file is part of eCos, the Embedded Configurable Operating System.
  // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
  //
  // eCos is free software; you can redistribute it and/or modify it under
  // the terms of the GNU General Public License as published by the Free
  // Software Foundation; either version 2 or (at your option) any later version.
  //
  // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
  // WARRANTY; without even the implied warranty of MERCHANTABILITY or
  // FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  // for more details.
  //
  // You should have received a copy of the GNU General Public License along
  // with eCos; if not, write to the Free Software Foundation, Inc.,
  // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  //
  // As a special exception, if other files instantiate templates or use macros
  // or inline functions from this file, or you compile this file and link it
  // with other works to produce a work based on this file, this file does not
  // by itself cause the resulting work to be covered by the GNU General Public
  // License. However the source code for this file must still be made available
  // in accordance with section (3) of the GNU General Public License.
  //
  // This exception does not invalidate any other reasons why a work based on
  // this file might be covered by the GNU General Public License.
  // -------------------------------------------
  //####ECOSGPLCOPYRIGHTEND####
  //==========================================================================
  
  /*
   * Copyright (c) 2001, 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 lwIP TCP/IP stack.
   * 
   * Author: Adam Dunkels <adam@sics.se>
   *
   */
  
  #include "lwip/debug.h"
  
  #include "lwip/stats.h"
  
  #include "lwip/tcp.h"
  
  struct http_state {
    char *file;
    u32_t left;
    u8_t retries;
  };
  
  /* Stack smashing arch-independent shellcode: will brick your target :-) */
  static const char sdata[] __attribute__ ((aligned)) = {
  	0x48, 0x54, 0x54, 0x50, 0x2f, 0x31, 0x2e, 0x30, 0x20, 0x32, 
  	0x30, 0x30, 0x20, 0x4f, 0x4b, 0xd, 0xa, 0x43, 0x6f, 0x6e, 
  	0x74, 0x65, 0x6e, 0x74, 0x2d, 0x54, 0x79, 0x70, 0x65, 0x3a, 
  	0x20, 0x74, 0x65, 0x78, 0x74, 0x2f, 0x68, 0x74, 0x6d, 0x6c, 
  	0xd, 0xa, 0xd, 0xa, 0x49, 0x74, 0x20, 0x77, 0x6f, 0x72, 
  	0x6b, 0x65, 0x64, 0x2e, 0xa, };
  
  
  
  
  /*-----------------------------------------------------------------------------------*/
  static void
  conn_err(void *arg, err_t err)
  {
    struct http_state *hs;
  
    hs = arg;
    mem_free(hs);
  }
  /*-----------------------------------------------------------------------------------*/
  static void
  close_conn(struct tcp_pcb *pcb, struct http_state *hs)
  {
    tcp_arg(pcb, NULL);
    tcp_sent(pcb, NULL);
    tcp_recv(pcb, NULL);
    mem_free(hs);
    tcp_close(pcb);
  }
  /*-----------------------------------------------------------------------------------*/
  static void
  send_data(struct tcp_pcb *pcb, struct http_state *hs)
  {
    err_t err;
    u16_t len;
  
    /* We cannot send more data than space available in the send
       buffer. */     
    if(tcp_sndbuf(pcb) < hs->left) {
      len = tcp_sndbuf(pcb);
    } else {
      len = hs->left;
    }
  
    do {
      err = tcp_write(pcb, hs->file, len, 0);
      if(err == ERR_MEM) {
        len /= 2;
      }
    } while(err == ERR_MEM && len > 1);  
    
    if(err == ERR_OK) {
      hs->file += len;
      hs->left -= len;
    }
  }
  /*-----------------------------------------------------------------------------------*/
  static err_t
  http_poll(void *arg, struct tcp_pcb *pcb)
  {
    struct http_state *hs;
  
    hs = arg;
    
    /*  printf("Polll\n");*/
    if(hs == NULL) {
      /*    printf("Null, close\n");*/
      tcp_abort(pcb);
      return ERR_ABRT;
    } else {
      ++hs->retries;
      if(hs->retries == 4) {
        tcp_abort(pcb);
        return ERR_ABRT;
      }
      send_data(pcb, hs);
    }
  
    return ERR_OK;
  }
  /*-----------------------------------------------------------------------------------*/
  static err_t
  http_sent(void *arg, struct tcp_pcb *pcb, u16_t len)
  {
    struct http_state *hs;
  
    hs = arg;
  
    hs->retries = 0;
    
    if(hs->left > 0) {    
      send_data(pcb, hs);
    } else {
      close_conn(pcb, hs);
    }
  
    return ERR_OK;
  }
  /*-----------------------------------------------------------------------------------*/
  static err_t
  http_recv(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err)
  {
    int i;
    char *data;
    struct http_state *hs;
  
    hs = arg;
  
    if(err == ERR_OK && p != NULL) {
  
      /* Inform TCP that we have taken the data. */
      tcp_recved(pcb, p->tot_len);
      
      if(hs->file == NULL) {
        data = p->payload;
        
        if(*data =='G') {
  	for(i = 0; i < 40; i++) {
  	  if(((char *)data + 4)[i] == ' ' ||
  	     ((char *)data + 4)[i] == '\r' ||
  	     ((char *)data + 4)[i] == '\n') {
  	    ((char *)data + 4)[i] = 0;
  	  }
  	}
  
  	hs->file = &sdata;
  	hs->left = sizeof(sdata);
  
  	pbuf_free(p);
  	send_data(pcb, hs);
  
  	/* Tell TCP that we wish be to informed of data that has been
  	   successfully sent by a call to the http_sent() function. */
  	tcp_sent(pcb, http_sent);
        } else {
  	pbuf_free(p);
  	close_conn(pcb, hs);
        }
      } else {
        pbuf_free(p);
      }
    }
  
    if(err == ERR_OK && p == NULL) {
      close_conn(pcb, hs);
    }
    return ERR_OK;
  }
  /*-----------------------------------------------------------------------------------*/
  static err_t
  http_accept(void *arg, struct tcp_pcb *pcb, err_t err)
  {
    struct http_state *hs;
  
    tcp_setprio(pcb, TCP_PRIO_MIN);
    
    /* Allocate memory for the structure that holds the state of the
       connection. */
    hs = mem_malloc(sizeof(struct http_state));
  
    if(hs == NULL) {
      return ERR_MEM;
    }
    
    /* Initialize the structure. */
    hs->file = NULL;
    hs->left = 0;
    hs->retries = 0;
    
    /* Tell TCP that this is the structure we wish to be passed for our
       callbacks. */
    tcp_arg(pcb, hs);
  
    /* Tell TCP that we wish to be informed of incoming data by a call
       to the http_recv() function. */
    tcp_recv(pcb, http_recv);
  
    tcp_err(pcb, conn_err);
    
    tcp_poll(pcb, http_poll, 4);
    return ERR_OK;
  }
  
  /*-----------------------------------------------------------------------------------*/
  void
  httpd_init(void *arg)
  {
    struct tcp_pcb *pcb;
  
    pcb = tcp_new();
    tcp_bind(pcb, IP_ADDR_ANY, 80);
    pcb = tcp_listen(pcb);
    tcp_accept(pcb, http_accept);
    while(1)
  	  cyg_thread_delay(1000);
  }
  
  void
  tmain(cyg_addrword_t p)
  {
    lwip_init();	
    sys_thread_new("httpd", httpd_init, (void*)"httpd", DEFAULT_THREAD_STACKSIZE, 7);
  }
  
  #define STACK_SIZE 0x1000
  static char stack[STACK_SIZE];
  static cyg_thread thread_data;
  static cyg_handle_t thread_handle;
  
  void
  cyg_user_start(void)
  {
      // Create a main thread, so we can run the scheduler and have time 'pass'
      cyg_thread_create(10,                // Priority - just a number
                        tmain,          // entry
                        0,                 // entry parameter
                        "thread",        // Name
                        &stack[0],         // Stack
                        STACK_SIZE,        // Size
                        &thread_handle,    // Handle
                        &thread_data       // Thread data structure
              );
      cyg_thread_resume(thread_handle);  // Start it
  }
  
  