diff options
| -rw-r--r-- | sys/fs/msdosfs/msdosfs_conv.c | 19 |
1 files changed, 14 insertions, 5 deletions
diff --git a/sys/fs/msdosfs/msdosfs_conv.c b/sys/fs/msdosfs/msdosfs_conv.c index 72439e4..1f4a32e 100644 --- a/sys/fs/msdosfs/msdosfs_conv.c +++ b/sys/fs/msdosfs/msdosfs_conv.c @@ -909,18 +909,27 @@ win2unixfn(wep, chksum, pmp) } /* - * Compute the checksum of a DOS filename for Win95 use + * Compute the unrolled checksum of a DOS filename for Win95 LFN use. */ u_int8_t winChksum(name) u_int8_t *name; { - int i; u_int8_t s; - for (s = 0, i = 11; --i >= 0; s += *name++) - s = (s << 7)|(s >> 1); - return s; + s = name[0]; + s = ((s << 7) | (s >> 1)) + name[1]; + s = ((s << 7) | (s >> 1)) + name[2]; + s = ((s << 7) | (s >> 1)) + name[3]; + s = ((s << 7) | (s >> 1)) + name[4]; + s = ((s << 7) | (s >> 1)) + name[5]; + s = ((s << 7) | (s >> 1)) + name[6]; + s = ((s << 7) | (s >> 1)) + name[7]; + s = ((s << 7) | (s >> 1)) + name[8]; + s = ((s << 7) | (s >> 1)) + name[9]; + s = ((s << 7) | (s >> 1)) + name[10]; + + return (s); } /* |
