From 8e4bff4cab0ddac6060645b0715210484d02ff40 Mon Sep 17 00:00:00 2001 From: Yuval Adam <_@yuv.al> Date: Wed, 30 Aug 2017 08:25:59 +0000 Subject: Initial file dump from open source release --- include/linux/adfs_fs.h | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) create mode 100644 include/linux/adfs_fs.h (limited to 'include/linux/adfs_fs.h') diff --git a/include/linux/adfs_fs.h b/include/linux/adfs_fs.h new file mode 100644 index 00000000..0d991071 --- /dev/null +++ b/include/linux/adfs_fs.h @@ -0,0 +1,23 @@ +#ifndef _ADFS_FS_H +#define _ADFS_FS_H + +#include + +/* + * 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 -- cgit v1.3.1