{ DISKREAD.PAS              Copyright (c) TrSek alias Zdeno Sekerak }
{ Fyzicky cita disketu a nasledne zobrazuje jej obsah.              }
{ Sipkami a klavesami PgUp, PgDn sa da zmenit stopa/sektor/hlava    }
{                                                                   }
{ Datum:24.07.1997                             http://www.trsek.com }

program fyzicke_citanie_disku;

uses crt,dos;
const poc=1;
      dlz=512;
      hex:array[0..15] of char=
      ('0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F');

var reg:registers;
    x,y,i,za,st,hl:integer;
    ch:char;
    s:string;
    ako,auto:boolean;
    text:array[0..poc*dlz] of byte;

procedure farba(f,g:integer);
begin
 textbackground(f);
 textcolor(g);
 lowvideo;
end;

procedure hexa(p:integer);
begin
  clrscr;
  writeln('stav operacie:',reg.ah,' pocet nacitanych sektorov:',reg.al,' sektor:',za,' stopa:',st,' hlava:',hl);
  for i:=1 to 8 do write('ÄÄÄÄ5ÄÄÄÄ0');
  for x:=0 to 25 do
   for y:=0 to 20 do begin
     gotoxy(x+1,y+3);
     i:=x+y*26;
     if p=i then farba(white,black);
     if ord(text[i])>31 then write(chr(text[i]))
                        else write('.');
     gotoxy(29+x*2,y+3);
     if (i/2)=int(i/2) then farba(black,white)
                       else farba(white,black);
     write(hex[text[i] div 16],hex[text[i] mod 16]);
     farba(black,white);
     if (x+y*26)=511 then begin gotoxy(x,y+3);write('°');end;
     end;
  for i:=1 to 8 do write('ÄÄÄÄ5ÄÄÄÄ0');
  write('Zmena sektoru: ',+chr(26)+''+chr(27)+'  Zmena stopy: '+chr(24)+''+chr(25)+'  Zmena vypisu: F3   Ukoncit: ESC ');
end;

procedure norm(p:integer);
begin
  clrscr;
  writeln('stav operacie:',reg.ah,' pocet nacitanych sektorov:',reg.al,' sektor:',za,' stopa:',st,' hlava:',hl);
  for i:=1 to 8 do write('ÄÄÄÄ5ÄÄÄÄ0');
  for x:=0 to poc*dlz-1 do begin
     if p=x then farba(white,black);
     if ord(text[x])>31 then write(chr(text[x]))
                        else write('.');
     if p=x then farba(black,white);
     end;
  write('Û');
  writeln;
  for i:=1 to 8 do write('ÄÄÄÄ5ÄÄÄÄ0');
  write('Zmena sektoru: ',+chr(26)+''+chr(27)+'  stopy: '+chr(24)+''+chr(25)+
        '  hlavy: F4  vypisu: F3   Ukoncit: ESC ');
end;

procedure citaj;
begin
  for x:=0 to poc*dlz do text[x]:=176;
  reg.ah:=$0;
  reg.dl:=$0;
  intr($13,reg);

  reg.ah:=2;
  reg.al:=poc;           {pocet sektorov  1}
  reg.cl:=za;            {cislo pociatku sektorov  1}
  reg.ch:=st;            {cislo stopy  0}
  reg.dh:=hl;            {cislo hlavicky  0}
  reg.dl:=0;             {cislo disku  0}
  reg.es:=seg(text);     {adresa pameti}
  reg.bx:=ofs(text);
  intr($13,reg);
end;

function pos(s:string):integer;
var i,ip:integer;
    z:string;
begin
 for i:=0 to poc*dlz-length(s)+1 do
   if chr(text[i])=s[1] then begin z:='';
       for ip:=0 to length(s)-1 do z:=z+chr(text[i+ip]);
       if z=s then begin pos:=i;exit;end;
       end;
 pos:=0;
end;

begin
 clrscr;za:=1;st:=0;ako:=true;hl:=0;auto:=false;
 repeat
 citaj;
 if auto then begin
         repeat
          za:=za+1;
          citaj;
          if (reg.al=0) and (za=1) then begin hl:=hl+1;st:=0;za:=0;reg.al:=1;end;
          if reg.al=0 then begin za:=0;st:=st+1;end;
          farba(black,white);
          gotoxy(1,4);write('Stopa:',za,' sektor:',st,' hlava:',hl,'  ');
          i:=pos(s);
          if i>0 then begin
                      if ako then norm(i)
                             else hexa(i);
                      repeat until (readkey in [#13,#27]);
                      clrscr;end;
         until ((hl>=2) or keypressed);
         ch:=readkey;ch:=chr(65);
         auto:=false;end;
  if ako then norm(-1)
         else hexa(-1);
  repeat
  ch:=readkey;
  if ch=#13 then begin
     clrscr;gotoxy(1,3);write('Sektor:');read(za);
     clrscr;gotoxy(1,3);write('Stopa :');read(st);
     clrscr;gotoxy(1,3);write('Hlava :');read(hl);
     clrscr;end;
  if ch=#0 then begin
   ch:=readkey;
   if ch=#72 then za:=za-1;
   if ch=#80 then za:=za+1;
   if ch=#75 then st:=st-1;
   if ch=#77 then st:=st+1;
   if ch=#62 then hl:=hl+1;
   if ch=#65 then begin
     clrscr;gotoxy(1,3);write('Retazec:');readln(s);
     auto:=true;end;
   if ch=#61 then begin ako:=not(ako);
               if ako then norm(-1)
                      else hexa(-1);
               end;
   if hl>1 then hl:=0;
   if za<1 then za:=1;
   if st<0 then st:=0;
   end;
   until (ch in [#13,#27,#72,#80,#75,#77,#62,#65]);
 until (ch in [#27]);
end.