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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;
}
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