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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 #ifdef __cplusplus
13 extern "C" {
14 #endif
15
16 #include <stdint.h>
17
18 extern const uint8_t OddByteParity[256];
19 extern const uint8_t EvenByteParity[256];
20
21 static inline uint8_t oddparity8(uint8_t bt)
22 {
23 return OddByteParity[bt];
24 }
25
26 static inline uint8_t evenparity8(const uint8_t bt)
27 {
28 return EvenByteParity[bt];
29 }
30
31 static inline uint8_t evenparity32(uint32_t x)
32 {
33 x ^= x >> 16;
34 x ^= x >> 8;
35 return EvenByteParity[x & 0xff];
36 }
37
38 #ifdef __cplusplus
39 }
40 #endif
41
42 #endif /* __PARITY_H */
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