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HEAD
mifare client update
[proxmark3-svn]
/
common
/
crc16.c
1
unsigned short
update_crc16
(
unsigned short
crc
,
unsigned char
c
) {
2
unsigned short
i
,
v
,
tcrc
=
0
;
3
4
v
= (
crc
^
c
) &
0xff
;
5
for
(
i
=
0
;
i
<
8
;
i
++) {
6
tcrc
= ( (
tcrc
^
v
) &
1
) ? (
tcrc
>>
1
) ^
0x8408
:
tcrc
>>
1
;
7
v
>>=
1
;
8
}
9
10
return
((
crc
>>
8
) ^
tcrc
)&
0xffff
;
11
}
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