Re: [lwip-users] How to send a large dynamic generated http page?

[Andrew Xiang]

Do you know file size in advance? In my case, I don't. 

I had to use TCP_WRITE_FLAG_COPY to make it work. 

#define TCP_FLAG TCP_WRITE_FLAG_COPY

static err_t
http_sent(void *arg, struct tcp_pcb *pcb, u16_t len)
{
  struct http_state *hs;

  hs = arg;

  if (hs->left > 0)
  {
    send_data(pcb, hs, TCP_FLAG);     
  }

  else if(more_data)
      {
  
          dump_data(0);

        hs->file = html_total;
        hs->left = strlen(html_total);
        
        send_data(pcb, hs, TCP_FLAG);    

        
          }
          
  else
      close_conn(pcb, hs);
  return ERR_OK;


}

On Wed, May 2, 2012 at 8:44 AM, Bill Auerbach <address@hidden> wrote:

>I've the same problem to solve. In my case they are log files with up to
>64KB. With the standard LwIP http server example it's not possible to
>send files with a size above the allowed buffer size. In most cases
>hs->left points just to the address in this buffer. So I think the best
>way is to create a other function which allows the "streaming" of the
>data (filling the buffer and sending and not to close the connection,
>even complete data was send).

It can be done because I've sent up to 800k files using the original
(non-SSI) httpd and note that I was basing this on the httpd_raw (sp?) demo.
Regardless of the file size the tcp_sent callback is used to continue to
send until the file end is reached.  I would expect 10k, 100k or 1MB to be
identical in the handling.

Bill

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