| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef _ADFS_FS_H |
| #define _ADFS_FS_H |
| |
| #include <uapi/linux/adfs_fs.h> |
| |
| /* |
| * Calculate the boot block checksum on an ADFS drive. Note that this will |
| * appear to be correct if the sector contains all zeros, so also check that |
| * the disk size is non-zero!!! |
| */ |
| static inline int adfs_checkbblk(unsigned char *ptr) |
| { |
| unsigned int result = 0; |
| unsigned char *p = ptr + 511; |
| |
| do { |
| result = (result & 0xff) + (result >> 8); |
| result = result + *--p; |
| } while (p != ptr); |
| |
| return (result & 0xff) != ptr[511]; |
| } |
| #endif |
