git.zerfleddert.de Git - proxmark3-svn/blob - 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 */