readabsolutesectors ( ) and writeabsolutesectors ( ) Function

 
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The coding of the functions readabsolutesectors ( ) and writeabsolutesectors ( ) have been given next:

//// Function to read absolute sector(s) \\\\

int readabsolutesectors ( int drive,
unsigned long sectornumber,
int numofsectors,
void *buffer )
{

union REGS i, o ;
struct SREGS s ;
struct diskaddrpacket pp ;

pp.packetsize = 16 ; /* packet size = 10H */
pp.reserved = 0 ; /* Reserved = 0 */

pp.blockcount = numofsectors ; /* Number of sectors
to read */

/* for Data buffer */

pp.bufferaddress = (char far*) MK_FP ( FP_SEG((void
far*)buffer), FP_OFF((void far*)buffer));

pp.blocknumber[0] = sectornumber ; /* Sector number
to read */

pp.blocknumber[1] = 0 ; /* Block number */

i.h.ah = 0x42 ; /* Function Number*/
i.h.dl = drive ; /* Physical Drive Number */

i.x.si = FP_OFF ( (void far*)&pp ) ; /* ds:si for
buffer Parameters */

s.ds = FP_SEG ( (void far*)&pp ) ; /* ds:si for
buffer Parameters */

/* Invoke the specified Function of INT 13H with segment register values */

int86x ( 0x13, &i, &o, &s ) ;

if ( o.x.cflag==1)
return 0 ; /*failure */

else
return 1 ; /* success */
}

Sample Chapters from book DATA RECOVERY WITH AND WITHOUT PROGRAMMING by Author Tarun Tyagi
Data Recovery with & without Programming


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ISBN
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BPB Publications, New Delhi, India
540
81-7656-922-4
$69.00 (Including Shipping Charges, Cost of Book and Other expenses, Free Source Code CD included with the Book)





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