cgi_process_data

#include <net_config.h>

void cgi_process_data (
    U8  code,     /* Type of data in received data buffer. */
    U8* dat,      /* Pointer to the data string from the POST method. */
    U16 len );    /* Number of bytes in the data string. */

The cgi_process_data function processes the data returned from the CGI form POST method. The HTTP server calls this function when a user presses the SUBMIT button on the input form, using a web browser.

The cgi_process_data function is in the HTTP_CGI.c module. The prototype is defined in net_config.h.

note

• The HTTP server calls the cgi_process_data function only if the input form, in HTML source, is created with the attribute METHOD=POST. For example:

  <FORM ACTION=index.htm METHOD=POST NAME=CGI>
   ..
  </FORM>
  

• Web browsers provide a filename for HTTP file upload with path included. It is a user responsibility to remove path information from the filename.
• For large files, file data is received in several small packets. The size of data packet depends on the TCP Maximum Segment Size. MSS value is typically 1460 bytes.
• The XML-POST is generated from the web service application, for example the Silverlight.

cgi_func, cgi_process_var, http_get_content_type, http_get_lang

void cgi_process_data (U8 code, U8 *dat, U16 len) {
  U8 passw[12], retyped[12];
  U8 var[40], stpassw;

  switch (code) {
    case 0:
      /* Url encoded form data received. */
      break;

    case 1:
      /* Filename for file upload received as encoded by the browser. */
      /* It might contain an absolute path to a file from the sending */
      /* host. Open a file for writing. */
      return;

    case 2:
      /* File content data received. Write data to a file. */
      /* This function will be called several times with   */
      /* code 2 when a big file is being uploaded.         */
      return;

    case 3:
      /* File upload finished. Close a file. */
      return;

    case 4:
      /* Other content type data, last packet. */
      pType = http_get_content_type ();
      /* check the content type for CGX file request. */
      /* pType is a pointer to a 0-terminated string  */
      /* For example: text/xml; charset=utf-8         */
      return;

    case 5:
      /* Other content type data, more to follow. */
      return;

    default:
      /* Ignore all other codes. */
      return;
  }

  if (len == 0) {
    /* No data, or all items (radio, checkbox) are off. */
    return;
  }
  stpassw = 0;
  do {
    /* Parse all returned parameters. */
    dat = http_get_var (dat, var, 40);
    if (var[0] != 0) {
      /* Parameter found, returned string is non 0-length. */
      if (str_scomp (var, "pw=") == __TRUE) {
        /* Change password. */
        str_copy (passw, var+3);
        stpassw |= 1;
      }
      else if (str_scomp (var, "pw2=") == __TRUE) {
        /* Retyped password. */
        str_copy (retyped, var+4);
        stpassw |= 2;
      }
    }
  } while (dat);
  if (stpassw == 0x03) {
    len = strlen (passw);
    if (mem_comp (passw, retyped, len) == __TRUE) {
      /* OK, both entered passwords the same, change it. */
      str_copy (http_auth_passw, passw);
    }
  }
}