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/* 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