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[proxmark3-svn] / common / parity.h
1 //-----------------------------------------------------------------------------
2 // This code is licensed to you under the terms of the GNU GPL, version 2 or,
3 // at your option, any later version. See the LICENSE.txt file for the text of
4 // the license.
5 //-----------------------------------------------------------------------------
6 // Generic CRC calculation code.
7 //-----------------------------------------------------------------------------
8
9 #ifndef __PARITY_H
10 #define __PARITY_H
11
12 #include <stdint.h>
13
14 extern const uint8_t OddByteParity[256];
15
16 static inline uint8_t oddparity8(uint8_t bt)
17 {
18 return OddByteParity[bt];
19 }
20
21
22 extern const uint8_t EvenByteParity[256];
23
24 static inline uint8_t evenparity8(const uint8_t bt)
25 {
26 return EvenByteParity[bt];
27 }
28
29
30 static inline uint8_t evenparity32(uint32_t x)
31 {
32 x ^= x >> 16;
33 x ^= x >> 8;
34 return EvenByteParity[x & 0xff];
35 }
36
37
38 #endif /* __PARITY_H */
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