1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ADFS_FS_H
3 #define _ADFS_FS_H
4
5 #include <uapi/linux/adfs_fs.h>
6
7 /*
8 * Calculate the boot block checksum on an ADFS drive. Note that this will
9 * appear to be correct if the sector contains all zeros, so also check that
10 * the disk size is non-zero!!!
11 */
12 static inline int adfs_checkbblk(unsigned char *ptr)
13 {
14 unsigned int result = 0;
15 unsigned char *p = ptr + 511;
16
17 do {
18 result = (result & 0xff) + (result >> 8);
19 result = result + *--p;
20 } while (p != ptr);
21
22 return (result & 0xff) != ptr[511];
23 }
24 #endif
25
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