5c7dd7acc3
repo: https://github.com/T-head-Semi/linux commit: b1313fe517ca3703119dcc99ef3bbf75ab42bcfb Change-Id: I6cbb35294024ea3a66140e311f4bb705fd7fd626
25 lines
574 B
C
25 lines
574 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ADFS_FS_H
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#define _ADFS_FS_H
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#include <uapi/linux/adfs_fs.h>
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/*
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* Calculate the boot block checksum on an ADFS drive. Note that this will
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* appear to be correct if the sector contains all zeros, so also check that
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* the disk size is non-zero!!!
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*/
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static inline int adfs_checkbblk(unsigned char *ptr)
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{
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unsigned int result = 0;
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unsigned char *p = ptr + 511;
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do {
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result = (result & 0xff) + (result >> 8);
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result = result + *--p;
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} while (p != ptr);
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return (result & 0xff) != ptr[511];
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}
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#endif
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