mirror of
https://github.com/RfidResearchGroup/proxmark3.git
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75 lines
1.9 KiB
C
75 lines
1.9 KiB
C
//-----------------------------------------------------------------------------
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// Copyright (C) Proxmark3 contributors. See AUTHORS.md for details.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// See LICENSE.txt for the text of 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 g_OddByteParity[256];
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static inline uint8_t oddparity8(const uint8_t x) {
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return g_OddByteParity[x];
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}
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static inline uint8_t evenparity8(const uint8_t x) {
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return !g_OddByteParity[x];
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}
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static inline uint8_t evenparity16(uint16_t x) {
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#if !defined __GNUC__
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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 oddparity16(uint16_t x) {
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#if !defined __GNUC__
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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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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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