X-Git-Url: http://cvs.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/f513388ee056cfaa34799ed19e451383db1065c3..1f065e1dad00ff5a63ebfedb8fbe04a9720bf2a6:/common/parity.h

diff --git a/common/parity.h b/common/parity.h
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--- /dev/null
+++ b/common/parity.h
@@ -0,0 +1,53 @@
+//-----------------------------------------------------------------------------
+// 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 <stdint.h>
+#include <stdbool.h>
+
+extern const uint8_t OddByteParity[256];
+
+
+static inline bool oddparity8(const uint8_t x) {
+	return OddByteParity[x];
+}
+
+
+static inline bool evenparity8(const uint8_t x) {
+	return !OddByteParity[x];
+}
+
+
+static inline bool evenparity32(uint32_t x) 
+{
+#if !defined __GNUC__
+	x ^= x >> 16;
+	x ^= x >> 8;
+	return evenparity8(x);
+#else
+	return __builtin_parity(x);
+#endif
+}
+
+
+static inline bool oddparity32(uint32_t x) 
+{
+#if !defined __GNUC__
+	x ^= x >> 16;
+	x ^= x >> 8;
+	return oddparity8(x);
+#else
+	return !__builtin_parity(x);
+#endif
+}
+
+#endif /* __PARITY_H */