code: function scanf($format)
      {
          $spec_pattern = "/%[+-]?('.)?[-]?(\d)*(\..\d)?[%bcdeEfFgGosuxX]/";
  
          $source = substr($this->data,$this->pos);
  
          $result = sscanf($source,$format);
  
          if ($result==-1) return;
          else {
              $l = 0;
              foreach ($result as $v) {
                  $l += strlen("".$v);
              }
          }
  
          $no_patterns_format = preg_replace($spec_pattern,"",$format);
          //echo "No patterns format : [".$no_patterns_format."] LEN=".strlen($no_patterns_format);
          $l+=strlen($no_patterns_format);
  
          $this->pos+=$l;
  
          return $result;
      }
docs: Reads data from this reader following the 'scanf' parameter convention.
  
  @param string $format The format string of the data to read
  @return array An array of ordered values readed following the format provided.
  
  @api