#include
#include
#include
#include
typedef unsigned char BYTE;
typedef unsigned int WORD;
typedef unsigned long DWORD;
enum BOOL {TRUE=0,FALSE=1};
struct PARTITIONINFO {
BYTE bootid; /* bootable? 0=no, 128=yes */
BYTE beghead; /* beginning head number */
BYTE begsect; /* beginning sector number */
BYTE begcyl; /* 10 bit nmbr, with high 2 bits put in begsect */
BYTE systid; /* Operating System type indicator code */
BYTE endhead; /* ending head number */
BYTE endsect; /* ending sector number */
BYTE endcyl; /* also a 10 bit nmbr, with same high 2 bit trick */
DWORD relsect; /* first sector relative to start of disk */
DWORD numsect; /* number of sectors in partition */
};
struct DISK_ADD_PACKET {
BYTE recordsize;
BYTE reserved;
WORD count;
DWORD transferadd;
DWORD lowbits;
DWORD highbits;
};
struct MBR{
BYTE codes[446];
struct PARTITIONINFO partition[4];
WORD mbrid;
};
struct driveinfo{
DWORD startsect;
BYTE sysid;
};
WORD ExtentionCheck (BYTE drive)
{
union REGS regs;
regs.h.ah = 0x41;
regs.x.bx = 0x55aa;
regs.h.dl = drive;
int86(0x13,®s,®s);
if(regs.x.bx != 0xaa55)
return FALSE;
return TRUE;
}
WORD ReadSect(BYTE disk, int nsects,DWORD lsects,void* data)
{
union REGS iregs,oregs;
struct SREGS sregs;
int count=0;
struct DISK_ADD_PACKET * p;
p = (struct DISK_ADD_PACKET *)malloc(sizeof(struct DISK_ADD_PACKET));
p->recordsize=sizeof(struct DISK_ADD_PACKET);
p->count=nsects;
p->transferadd=(DWORD)data;
p->lowbits=lsects;
p->highbits=0; /* We dont need to access HD > 2TB */
iregs.h.ah = 0x42;
iregs.h.dl = disk;
iregs.x.si = FP_OFF(p);
sregs.ds = FP_SEG(p);
int86x(0x13,&iregs,&oregs,&sregs);
if(oregs.h.ah==0)
{
free(p);
return TRUE;
}
free(p);
return FALSE;
}
WORD WriteSect(BYTE disk, int nsects,DWORD lsects,void* data)
{
union REGS iregs,oregs;
struct SREGS sregs;
int count=0;
struct DISK_ADD_PACKET * p;
p = (struct DISK_ADD_PACKET *)malloc(sizeof(struct DISK_ADD_PACKET));
p->recordsize=sizeof(struct DISK_ADD_PACKET);
p->count=nsects;
p->transferadd=(DWORD)data;
p->lowbits=lsects;
p->highbits=0; /* We dont need to access HD > 2TB */
iregs.x.ax = 0x4302;
iregs.h.dl = disk;
iregs.x.si = FP_OFF(p);
sregs.ds = FP_SEG(p);
int86x(0x13,&iregs,&oregs,&sregs);
if(oregs.h.ah==0)
{
free(p);
return TRUE;
}
free(p);
return FALSE;
}
DWORD lsect=0;
void main()
{
BYTE disk=0x80;
WORD nsect=1,index=0,i=0,hi,choice;
DWORD extsect;
BYTE hideindex[5],id;
struct MBR *mbr;
struct driveinfo dinfo[10];//max 10 partitions
mbr=(struct MBR *)malloc(sizeof(struct MBR));
if(ExtentionCheck(disk)==FALSE)
{printf("extended int 13 is not supported
");
exit(1);
}
if(ReadSect(disk, nsect, lsect,(char *)mbr)==TRUE)
for(i=0;i<4;i++)
if(mbr->partition[i].systid!=0)
{printpart(mbr,i);
dinfo[index].startsect=lsect;
dinfo[index].sysid=mbr->partition[i].systid;
index++;
}
if(mbr->partition[1].systid==0xf)//0xf for extended partition
{lsect=mbr->partition[1].relsect;
extsect=lsect;
link:
if(ReadSect(disk, nsect, lsect,(char *)mbr)==TRUE)
{printpart(mbr,0);
dinfo[index].startsect=lsect;
dinfo[index].sysid=mbr->partition[0].systid;
index++;
if(index>=10){printf("no of partition exceed max limit");exit(1);}
if(mbr->partition[1].systid!=0)
{lsect=extsect+mbr->partition[1].relsect;
goto link;
}
}
}
printf("
Hide partition(1)
");
printf("Revele partition(2)
");
printf("Quit(3)
Enter your choice(1/2/3):");
hideindex[0]=getche();
choice=atoi(hideindex);
switch(choice)
{
case 1:
printf("
Which drive do u want to hide:(0-%d):",index-1);
scanf("%s",hideindex);
hi=atoi(hideindex);
if(hi<=index)
{
id=dinfo[hi].sysid;
if(id==1||id==4||id==7||id==0xb||id==0xc||id==0xe)
{ lsect=dinfo[hi].startsect;
id+=0x10;
if(ReadSect(disk, nsect, lsect,(char *)mbr)==TRUE)
{mbr->partition[0].systid=id;
if(WriteSect(disk,nsect,lsect,(char *)mbr)==TRUE)
printf("
HIDDEN SUCCESSFULLY");
}
}
else
printf("Cant Hide");
}
break;
case 2:
printf("
Which drive do u want to Revele:(0-%d):",index-1);
scanf("%s",hideindex);
hi=atoi(hideindex);
if(hi<=index)
{
id=dinfo[hi].sysid;
if(id==0x11||id==0x14||id==0x17||id==0x1b||id==0x1c||id==0x1e)
{ lsect=dinfo[hi].startsect;
id-=0x10;
if(ReadSect(disk, nsect, lsect,(char *)mbr)==TRUE)
{mbr->partition[0].systid=id;printf("%x",mbr->partition[0].systid);
if(WriteSect(disk,nsect,lsect,(char *)mbr)==TRUE)
printf("
REVELED SUCCESSFULLY");
}
}
else
printf("Cant Revele
");
}
break;
case 3:
exit(1);break;
default:
printf("
invalid choice");exit(1);
break;
};
}
printpart(struct MBR *mbr,WORD i)
{
BYTE bootable[]="YES";
BYTE id[7];
static BYTE c=0,index=0;
if(c==0)//to execute this for once
{
clrscr();
gotoxy(30,1);
printf("Partition Table");
gotoxy(2,2);
printf("INDEX");
gotoxy(8,2);
printf("SystemID");
gotoxy(17,2);
printf("Bootable");
gotoxy(26,2);
printf("StartingLBA");
gotoxy(38,2);
printf("SIZEINSECTORS");
gotoxy(52,2);
printf("SIZEINGB");
c++;
gotoxy(46,20);
printf("Coded by Tapan Kumar Mishra");
gotoxy(55,21);
printf("7th Sem,Electrical Engg.");
gotoxy(55,22);
printf("IGIT Sarang,Orissa");
gotoxy(46,23);
printf("Email id:titu_igit@rediffmail.com");
}
if(mbr->partition[i].bootid!=0x80)
strcpy(bootable,"NO");
gotoxy(2,3+index);
printf("%d",index);
gotoxy(8,3+index);
systemid((BYTE)mbr->partition[i].systid,id);
printf("%s",id);
gotoxy(17,3+index);
printf("%s",bootable);
gotoxy(26,3+index);
printf("%ld",mbr->partition[i].relsect+lsect);
gotoxy(38,3+index);
printf("%ld
",mbr->partition[i].numsect);
gotoxy(52,3+index);
printf("%5.2fGB",(float)mbr->partition[i].numsect/2097152.0);
index++;
return 0;
}
systemid(BYTE systid,BYTE *id)
{
switch(systid)
{
case 00:
strcpy(id,"empty");
break;
case 01:
strcpy(id,"FAT12");
break;
case 04:
strcpy(id,"FAT16");
break;
case 05:
strcpy(id,"EXTNED");
break;
case 0xb:
strcpy(id,"FAT32");
break;
case 0xc:
strcpy(id,"FAT32");
break;
case 0xE:
strcpy(id,"FAT16");
break;
case 0xf:
strcpy(id,"EXNDED");
break;
case 0x82:
strcpy(id,"SWAP");
break;
case 0x83:
strcpy(id,"EXT2fs");
break;
case 0x11:
case 0x14:
case 0x15:
case 0x16:
case 0x17:
case 0x1b:
case 0x1c:
case 0x1e:
case 0x1f:
strcpy(id,"hidden");
break;
}
}
Program to hide the partation of your disk drive in c.
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