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60 lines
1.4 KiB
C
60 lines
1.4 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 <stdint.h>
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#include <stdbool.h>
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#include "string.h"
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extern const uint8_t OddByteParity[256];
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static inline bool oddparity8(const uint8_t x) {
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return OddByteParity[x];
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}
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static inline void oddparitybuf(const uint8_t *x, size_t len, uint8_t *parity) {
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memset(parity, 0x00, (len - 1) / 8 + 1);
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for (int i = 0; i < len; i++)
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parity[i / 8] |= oddparity8(x[i]) << (7 - (i % 8));
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}
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static inline bool evenparity8(const uint8_t x) {
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return !OddByteParity[x];
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}
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static inline bool evenparity32(uint32_t x)
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{
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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);
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#endif
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}
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static inline bool oddparity32(uint32_t x)
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{
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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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