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https://github.com/openharmony/third_party_Linux_Kernel.git
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maguangyao
24 lines
535 B
C
24 lines
535 B
C
#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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