Extract Manchester decoder, formatter.

firmware/application/manchester.hpp

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+/*
+ * Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
+ *
+ * This file is part of PortaPack.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef __MANCHESTER_H__
+#define __MANCHESTER_H__
+
+#include <cstdint>
+#include <cstddef>
+#include <bitset>
+#include <string>
+
+class ManchesterDecoder {
+public:
+	struct DecodedSymbol {
+		uint_fast8_t value;
+		uint_fast8_t error;
+	};
+
+	constexpr ManchesterDecoder(
+		const std::bitset<1024>& encoded,
+		const size_t count,
+		const size_t sense = 0
+	) : encoded { encoded },
+		count { count },
+		sense { sense }
+	{
+	}
+
+	DecodedSymbol operator[](const size_t index) const {
+		const size_t encoded_index = index * 2;
+		if( (encoded_index + 1) < count ) {
+			const auto value = encoded[encoded_index + sense];
+			const auto error = encoded[encoded_index + 0] == encoded[encoded_index + 1];
+			return { value, error };
+		} else {
+			return { 0, 1 };
+		}
+	}
+
+	size_t symbols_count() const {
+		return count / 2;
+	}
+
+private:
+	const std::bitset<1024>& encoded;
+	const size_t count;
+	const size_t sense;
+};
+
+struct ManchesterFormatted {
+	const std::string data;
+	const std::string errors;
+};
+
+ManchesterFormatted format_manchester(
+	const ManchesterDecoder& decoder
+);
+
+#endif/*__MANCHESTER_H__*/