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