1 files changed, 129 insertions, 0 deletions
diff --git a/src/gprs_coding_scheme.h b/src/gprs_coding_scheme.h
new file mode 100644
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+++ b/src/gprs_coding_scheme.h
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+/* gprs_coding_scheme.h
+ *
+ * Copyright (C) 2015 by Sysmocom s.f.m.c. GmbH
+ * Author: Jacob Erlbeck <jerlbeck@sysmocom.de>
+ *
+ * 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
+ * of the License, 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; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ */
+
+#pragma once
+
+#include <stdint.h>
+#include <stddef.h>
+
+
+class GprsCodingScheme {
+public:
+	enum Scheme {
+		UNKNOWN,
+		CS1, CS2, CS3, CS4,
+		MCS1, MCS2, MCS3, MCS4,
+		MCS5, MCS6, MCS7, MCS8, MCS9,
+		NUM_SCHEMES
+	};
+
+	enum Mode {
+		GPRS,
+		EGPRS_GMSK,
+		EGPRS,
+	};
+
+	GprsCodingScheme(Scheme s = UNKNOWN);
+
+	operator bool() const {return m_scheme != UNKNOWN;}
+	operator int()  const {return (int)m_scheme;}
+	void operator =(Scheme s);
+	void operator =(GprsCodingScheme o);
+	bool isValid()   const {return UNKNOWN <= m_scheme && m_scheme <= MCS9;}
+	bool isGprs()   const {return CS1 <= m_scheme && m_scheme <= CS4;}
+	bool isEgprs()  const {return m_scheme >= MCS1;}
+	bool isEgprsGmsk()  const {return isEgprs() && m_scheme <= MCS4;}
+	bool isCompatible(Mode mode) const;
+
+	void inc(Mode mode);
+	void dec(Mode mode);
+
+	unsigned int sizeUL() const;
+	unsigned int sizeDL() const;
+	unsigned int maxBytesUL() const;
+	unsigned int maxBytesDL() const;
+	unsigned int spareBitsUL() const;
+	unsigned int spareBitsDL() const;
+	const char *name() const;
+
+	static GprsCodingScheme getBySizeUL(unsigned size);
+
+private:
+	enum Scheme m_scheme;
+};
+
+inline bool GprsCodingScheme::isCompatible(Mode mode) const
+{
+	switch (mode) {
+	case GPRS: return isGprs();
+	case EGPRS_GMSK: return isEgprsGmsk();
+	case EGPRS: return isEgprs();
+	}
+
+	return false;
+}
+
+inline void GprsCodingScheme::inc(Mode mode)
+{
+	if (!isCompatible(mode))
+		/* This should not happen. TODO: Use assert? */
+		return;
+
+	Scheme new_cs(Scheme(m_scheme + 1));
+	if (!GprsCodingScheme(new_cs).isCompatible(mode))
+		/* Clipping, do not change the value */
+		return;
+
+	m_scheme = new_cs;
+}
+
+inline void GprsCodingScheme::dec(Mode mode)
+{
+	if (!isCompatible(mode))
+		/* This should not happen. TODO: Use assert? */
+		return;
+
+	Scheme new_cs(Scheme(m_scheme - 1));
+	if (!GprsCodingScheme(new_cs).isCompatible(mode))
+		/* Clipping, do not change the value */
+		return;
+
+	m_scheme = new_cs;
+}
+
+inline GprsCodingScheme::GprsCodingScheme(Scheme s)
+	: m_scheme(s)
+{
+	if (!isValid())
+		m_scheme = UNKNOWN;
+}
+
+inline void GprsCodingScheme::operator =(Scheme s)
+{
+	m_scheme = s;
+
+	if (!isValid())
+		m_scheme = UNKNOWN;
+}
+
+inline void GprsCodingScheme::operator =(GprsCodingScheme o)
+{
+	m_scheme = o.m_scheme;
+}