include/linux/adfs_fs.h

   1 #ifndef _ADFS_FS_H
   2 #define _ADFS_FS_H
   3
   4 #include <uapi/linux/adfs_fs.h>
   5
   6 /*
   7  * Calculate the boot block checksum on an ADFS drive.  Note that this will
   8  * appear to be correct if the sector contains all zeros, so also check that
   9  * the disk size is non-zero!!!
  10  */
  11 static inline int adfs_checkbblk(unsigned char *ptr)
  12 {
  13         unsigned int result = 0;
  14         unsigned char *p = ptr + 511;
  15
  16         do {
  17                 result = (result & 0xff) + (result >> 8);
  18                 result = result + *--p;
  19         } while (p != ptr);
  20
  21         return (result & 0xff) != ptr[511];
  22 }
  23 #endif