lwip的sample_http.c

void
httpd_init(void)
{
  struct tcp_pcb *pcb;

  pcb = tcp_new();
  tcp_bind(pcb, NULL, 80);
    tcp_listen(pcb);
  tcp_accept(pcb, http_accept);

}

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;
}

 

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;
  //added by millin, 2008.01
  u8_t hour,min,sec;
  u16_t day;
 

  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;
     }// if
  }//for
 
  // if it was GET dsp.jpg
  if ((*(data+5) =='E') && (*(data+6) =='V') && (*(data+7) =='B')) {
   hs->file = (char *)&jpeg;
   hs->left = sizeof(jpeg)+1;
  }
  // GET other files
  else {
   hs->file = (char *)&demo;
   hs->left = sizeof(demo)+1;

  } 
  
  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);
     
      } //if(*data =='G')
     
      else {
   pbuf_free(p);
   close_conn(pcb, hs);
      } //else if(*data =='G')
 
 } //if(hs->file == NULL)
 
 else {
        pbuf_free(p);
    }
  }

  if(err == ERR_OK && p == NULL) {
    close_conn(pcb, hs);
  }
  return ERR_OK;
}

 

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