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https://github.com/RfidResearchGroup/proxmark3.git
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47 lines
1.2 KiB
C
47 lines
1.2 KiB
C
//-----------------------------------------------------------------------------
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// This code is licensed to you under the terms of the GNU GPL, version 2 or,
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// at your option, any later version. See the LICENSE.txt file for the text of
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// the license.
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//-----------------------------------------------------------------------------
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// Parity functions
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//-----------------------------------------------------------------------------
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// all functions defined in header file by purpose. Allows compiler optimizations.
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#ifndef __PARITY_H
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#define __PARITY_H
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#include "common.h"
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extern const uint8_t OddByteParity[256];
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static inline uint8_t oddparity8(const uint8_t x) {
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return OddByteParity[x];
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}
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static inline uint8_t evenparity8(const uint8_t x) {
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return !OddByteParity[x];
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}
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static inline uint8_t evenparity32(uint32_t x) {
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#if !defined __GNUC__
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x ^= x >> 16;
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x ^= x >> 8;
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return evenparity8(x);
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#else
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return (__builtin_parity(x) & 0xFF);
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#endif
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}
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static inline uint8_t oddparity32(uint32_t x) {
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#if !defined __GNUC__
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x ^= x >> 16;
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x ^= x >> 8;
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return oddparity8(x);
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#else
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return !__builtin_parity(x);
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#endif
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}
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#endif /* __PARITY_H */
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