Enc28j60 , EtherCard Header question?

Projects Programming
1

Hi.
Can somebody tell me what exactly does below functions do in my WebSever sample .I'm using Ethercard.h from github.com.
1-BufferFiller bfill = ether.tcpOffset();
2-bfill.emit_p(PSTR(....
3-ether.httpServerReply(bfill.position());
Thanks.

//PartOfCode
    BufferFiller bfill = ether.tcpOffset();
    bfill.emit_p(PSTR("HTTP/1.0 200 OK\r\n"
      "Content-Type: text/html\r\nPragma: no-cache\r\n\r\n"
      "<html><head><title>WebLed</title></head>"
      "<body>LED Status: $S "
      "<a href=\"/?status=$S\"><input type=\"button\" value=\"$S\"></a>"
      "</body></html>"      
      ), statusLabel, buttonLabel, buttonLabel);
    ether.httpServerReply(bfill.position());
2

The ether object is an instance of a class. The tcpOffset() function returns a value that is stored in the bFill variable, who's type is BufferFiller.

The BufferFiller class has a method, emit_p(), that stores data in the BufferFiller instance's private fields.

The ether object also has a httpServerReply() method that sends the buffered data to the server and collects the reply from the server. The argument defines where, in the BufferFiller instance, to store the response.