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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,
};
enum HeaderType {
HEADER_INVALID,
HEADER_GPRS_CONTROL,
HEADER_GPRS_DATA,
HEADER_EGPRS_DATA_TYPE_1,
HEADER_EGPRS_DATA_TYPE_2,
HEADER_EGPRS_DATA_TYPE_3,
};
GprsCodingScheme(Scheme s = UNKNOWN);
operator bool() const {return m_scheme != UNKNOWN;}
operator int() const {return (int)m_scheme;}
operator Scheme() const {return m_scheme;}
unsigned int to_num() const;
GprsCodingScheme& operator =(Scheme s);
GprsCodingScheme& 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;
bool isCompatible(GprsCodingScheme o) const;
void inc(Mode mode);
void dec(Mode mode);
void inc();
void dec();
unsigned int sizeUL() const;
unsigned int sizeDL() const;
unsigned int maxBytesUL() const;
unsigned int maxBytesDL() const;
unsigned int spareBitsUL() const;
unsigned int spareBitsDL() const;
unsigned int maxDataBlockBytes() const;
unsigned int numDataBlocks() const;
const char *name() const;
HeaderType headerTypeData() const;
HeaderType headerTypeControl() const;
static GprsCodingScheme getBySizeUL(unsigned size);
static GprsCodingScheme getGprsByNum(unsigned num);
static GprsCodingScheme getEgprsByNum(unsigned num);
private:
enum Scheme m_scheme;
};
inline unsigned int GprsCodingScheme::to_num() const
{
if (isGprs())
return (m_scheme - CS1) + 1;
if (isEgprs())
return (m_scheme - MCS1) + 1;
return 0;
}
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 bool GprsCodingScheme::isCompatible(GprsCodingScheme o) const
{
return (isGprs() && o.isGprs()) || (isEgprs() && o.isEgprs());
}
inline GprsCodingScheme::HeaderType GprsCodingScheme::headerTypeControl() const
{
return HEADER_GPRS_CONTROL;
}
inline GprsCodingScheme::GprsCodingScheme(Scheme s)
: m_scheme(s)
{
if (!isValid())
m_scheme = UNKNOWN;
}
inline GprsCodingScheme& GprsCodingScheme::operator =(Scheme s)
{
m_scheme = s;
if (!isValid())
m_scheme = UNKNOWN;
return *this;
}
inline GprsCodingScheme& GprsCodingScheme::operator =(GprsCodingScheme o)
{
m_scheme = o.m_scheme;
return *this;
}
inline GprsCodingScheme GprsCodingScheme::getGprsByNum(unsigned num)
{
if (num < 1 || num > 4)
return GprsCodingScheme();
return GprsCodingScheme(Scheme(CS1 + (num - 1)));
}
inline GprsCodingScheme GprsCodingScheme::getEgprsByNum(unsigned num)
{
if (num < 1 || num > 9)
return GprsCodingScheme();
return GprsCodingScheme(Scheme(MCS1 + (num - 1)));
}
/* The coding schemes form a partial ordering */
inline bool operator ==(GprsCodingScheme a, GprsCodingScheme b)
{
return int(a) == int(b);
}
inline bool operator !=(GprsCodingScheme a, GprsCodingScheme b)
{
return !(a == b);
}
inline bool operator <(GprsCodingScheme a, GprsCodingScheme b)
{
return a.isCompatible(b) && int(a) < int(b);
}
inline bool operator >(GprsCodingScheme a, GprsCodingScheme b)
{
return a.isCompatible(b) && int(a) > int(b);
}
inline bool operator <=(GprsCodingScheme a, GprsCodingScheme b)
{
return a == b || a < b;
}
inline bool operator >=(GprsCodingScheme a, GprsCodingScheme b)
{
return a == b || a > b;
}
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