arduino, setup ethernet & network using data from SD config file

Im try to add to my sketch a dynamic way to setup the ethernet info (mac, ip, gateway, subnet) from a configuration file (config.txt). So running a webserver and serving htm files from sd card, user can go to setting page, fill a form with these info and when posted , the webserver parse the http form and save (update) the config.txt file. After that system do a restart, in order to start with the new settings (by read the config.txt file)

I have create succesfully all the parts (sd, ethernet, webserver, webclient, create the config file from posted form data) except the get params by reading the config.txt file.

I can read line by line the config, I can split the line to param & value, and now I need to fill some byte variables with the readed data. I can (after a month of google searching) to read IPs (decimal values) to byte array. Im stack to read the MAC ADDRESS hex into byte array. The config file contains the:

mac=8f:2c:2b:19:e0:b7;ip=192.168.1.200;netmask=255.255.255.0;gateway=192.168.1.254;dns=8.8.8.8;posturl=192.168.1.157;postport=8080;postscript=/itherm/update.php;interval=60000;

and the code that I use to read is:

byte myMAC[6];byte myIP[4];  File fset;  fset = SD.open("config.txt");  if (fset){    char ff[40];    while (fset.available()>1){      bool eol=false;      for (int i=0; !eol;i++){        ff[i]=fset.read();        if (ff[i]=='\n'){           eol=true;        }      }      String par="";      bool DONE=false;      for (int i=0; !DONE;i++){        par+=ff[i];        if (ff[i]== '='){DONE=true;}      }      String pval="";      DONE=false;//------------------------      if (par=="ip=" ){        int x=0;        while(!DONE){          for(int i=3;i<=i+21;i++){            if(ff[i]=='.'){              myIP[x]=pval.toInt();              x++;              i++;              pval="";            }            else if(ff[i]==';' || i>20){              myIP[x]=pval.toInt();              DONE=true;              break;            }            pval+=ff[i];          }        }      }    } //while (fset.available()>1)  } //if (fset)

I will appreciate any help. Please no answers with simple use of Serial.print(). I have found hundreds of suggestions but none, that work properly to read all the parameters (dec, hex, strings). After a month of effort & searching, I wonder why something so necessary and useful does not exist as an example in the community, completely functional !!

Best regards