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24 lines
574 B
24 lines
574 B
/* 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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