[proxmark3-svn] / common / parity.h

//-----------------------------------------------------------------------------
// 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.
//-----------------------------------------------------------------------------
// Generic CRC calculation code.
//-----------------------------------------------------------------------------

#ifndef __PARITY_H
#define __PARITY_H

#include <stdint.h>

extern const uint8_t OddByteParity[256];

static inline uint8_t oddparity8(uint8_t bt)
{
	return OddByteParity[bt];
}


extern const uint8_t EvenByteParity[256];

static inline uint8_t evenparity8(const uint8_t bt)
{
	return EvenByteParity[bt];
}


static inline uint8_t evenparity32(uint32_t x) 
{
	x ^= x >> 16;
	x ^= x >> 8;
	return EvenByteParity[x & 0xff];
}


#endif /* __PARITY_H */
Commit	Line	Data
2b1f4228	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
b351374c	16	static inline uint8_t oddparity8(uint8_t bt)
	17	{
	18	return OddByteParity[bt];
	19	}
2b1f4228	20
	21
	22	extern const uint8_t EvenByteParity[256];
	23
b351374c	24	static inline uint8_t evenparity8(const uint8_t bt)
	25	{
	26	return EvenByteParity[bt];
2b1f4228	27	}
	28
	29
a531720a	30	static inline uint8_t evenparity32(uint32_t x)
2b1f4228	31	{
	32	x ^= x >> 16;
	33	x ^= x >> 8;
	34	return EvenByteParity[x & 0xff];
	35	}
	36
	37
	38	#endif /* __PARITY_H */