$Id: logos.txt,v 1.1 2001/04/16 22:32:19 pkot Exp $

------------------------[ Tutorial about logos files ]-------------------------
nol (operator logo) and ngg (caller logo) files include the header as few
first bytes of their content. That is 16 or 20 bytes structure. Header
contains type of the file, netcode, width and height of icon. But width and
height of icon is very important. Why? Because in NOKIA 7110, width = 72 bytes
and height = 28 lines, and in other NOKIA phones witdh = 72 bytes, but height
is only 14 lines ( thx for that info to Gabriele Zappi ).

[1] NOL header

            1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
            N O L 0 1 0 x 0 1  0  x  0  x  0  1  0  1  0  x  0

    so :
	first 3 bytes that's type of file
	next 3 bytes (4,5,6) - nothing important
        next 4 (7,8,9,10) - network code :
	       sprintf(netcode, "%d %02d", header[7] + 256 * header[8], header[9]);
               <<<<<<<<<<< this line is from common/gsm-common.h >>>>>>>>>>>
        
        next 3 (11,12,13) - very important bytes :
			    width of icon = header[11]
			    height of icon = header[13]
        another 7 bytes (14,15,..,20) - I think that's nothing special
    
[2] NGG header

	       1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
	       N G G 0 1 0 x 0 x  0  1  0  1  0  x  0

	so :
	   first 3 bytes that's type of file 
	   next 3 bytes (4,5,6) - nothing important
           next 3 (7,8,9) - very important
			    width of icon = header[7]
			    height of icon = header[9]
           another 7 bytes (10,11,..,16) - nothing special 

[3] icon's bytes

To show icon on terminal you can read (height) times 72 bytes line and print
these lines in the terminal:

             ...
             for (i = 0; i < heigth; i++) {
                 read(buffer, 1, width, fd);
                 printf("%s\n", buffer);
             }
	     ...	 

------------------[ 2001 crayola <--> szuflandia corporation ]-----------------
		   crayola@polbox.com klepacz@juni.gliwice.pl