LXR linux/include/linux/adfs

   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 */
  11static 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
  24