proxmark3/common/parity.h

65 lines
1.5 KiB
C
Raw Normal View History

//-----------------------------------------------------------------------------
// This code is licensed to you under the terms of the GNU GPL, version 2 or,
// at your option, any later version. See the LICENSE.txt file for the text of
// the license.
//-----------------------------------------------------------------------------
// Parity functions
//-----------------------------------------------------------------------------
// all functions defined in header file by purpose. Allows compiler optimizations.
#ifndef __PARITY_H
#define __PARITY_H
#include "common.h"
extern const uint8_t OddByteParity[256];
2021-02-24 06:00:29 +08:00
static inline uint8_t oddparity8(const uint8_t x) {
2019-03-10 02:19:50 +08:00
return OddByteParity[x];
}
2021-02-24 06:00:29 +08:00
static inline uint8_t evenparity8(const uint8_t x) {
2019-03-10 02:19:50 +08:00
return !OddByteParity[x];
}
2021-07-14 21:01:01 +08:00
static inline uint8_t evenparity16(uint16_t x) {
#if !defined __GNUC__
x ^= x >> 8;
return evenparity8(x);
#else
return (__builtin_parity(x) & 0xFF);
#endif
}
static inline uint8_t oddparity16(uint16_t x) {
#if !defined __GNUC__
x ^= x >> 8;
return oddparity8(x);
#else
return !__builtin_parity(x);
#endif
}
2021-02-24 06:00:29 +08:00
static inline uint8_t evenparity32(uint32_t x) {
#if !defined __GNUC__
2019-03-10 02:19:50 +08:00
x ^= x >> 16;
x ^= x >> 8;
return evenparity8(x);
#else
2021-04-17 19:16:39 +08:00
return (__builtin_parity(x) & 0xFF);
#endif
}
2021-02-24 06:00:29 +08:00
static inline uint8_t oddparity32(uint32_t x) {
#if !defined __GNUC__
2019-03-10 02:19:50 +08:00
x ^= x >> 16;
x ^= x >> 8;
return oddparity8(x);
#else
2019-03-10 02:19:50 +08:00
return !__builtin_parity(x);
#endif
}
#endif /* __PARITY_H */