164 lines
4.1 KiB
C++
164 lines
4.1 KiB
C++
/* gprs_coding_scheme.h
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*
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* Copyright (C) 2015 by Sysmocom s.f.m.c. GmbH
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* Author: Jacob Erlbeck <jerlbeck@sysmocom.de>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#pragma once
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#include <stdint.h>
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#include <stddef.h>
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extern "C" {
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#include <osmocom/core/utils.h>
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#include "coding_scheme.h"
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}
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class GprsCodingScheme {
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public:
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#define EGPRS_ARQ1 0x0
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#define EGPRS_ARQ2 0x1
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GprsCodingScheme(CodingScheme s = UNKNOWN);
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operator bool() const {return m_scheme != UNKNOWN;}
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operator CodingScheme() const {return m_scheme;}
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uint8_t to_num() const;
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GprsCodingScheme& operator =(CodingScheme s);
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bool operator == (CodingScheme s) const;
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GprsCodingScheme& operator =(GprsCodingScheme o);
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bool isValid() const {return UNKNOWN <= m_scheme && m_scheme <= MCS9;}
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bool isCompatible(enum mcs_kind mode) const;
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bool isCompatible(GprsCodingScheme o) const;
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bool isFamilyCompatible(GprsCodingScheme o) const;
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void inc(enum mcs_kind mode);
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void dec(enum mcs_kind mode);
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void inc();
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void dec();
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void decToSingleBlock(bool *needStuffing);
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uint8_t sizeUL() const;
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uint8_t sizeDL() const;
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uint8_t usedSizeUL() const;
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uint8_t usedSizeDL() const;
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uint8_t maxBytesUL() const;
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uint8_t maxBytesDL() const;
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uint8_t spareBitsUL() const;
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uint8_t spareBitsDL() const;
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uint8_t maxDataBlockBytes() const;
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uint8_t optionalPaddingBits() const;
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enum HeaderType headerTypeData() const;
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static GprsCodingScheme getBySizeUL(unsigned size);
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static GprsCodingScheme getGprsByNum(unsigned num);
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static GprsCodingScheme getEgprsByNum(unsigned num);
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private:
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GprsCodingScheme(int s); /* fail on use */
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GprsCodingScheme& operator =(int s); /* fail on use */
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enum CodingScheme m_scheme;
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};
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// FIXME: remove once < comparison operator below is no longer necessary
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inline uint8_t GprsCodingScheme::to_num() const
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{
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if (mcs_is_gprs(m_scheme))
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return (m_scheme - CS1) + 1;
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if (mcs_is_edge(m_scheme))
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return (m_scheme - MCS1) + 1;
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return 0;
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}
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inline bool GprsCodingScheme::isCompatible(enum mcs_kind mode) const
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{
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switch (mode) {
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case GPRS: return mcs_is_gprs(m_scheme);
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case EGPRS_GMSK: return mcs_is_edge_gmsk(m_scheme);
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case EGPRS: return mcs_is_edge(m_scheme);
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}
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return false;
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}
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inline bool GprsCodingScheme::isCompatible(GprsCodingScheme o) const
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{
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return (mcs_is_gprs(m_scheme) && mcs_is_gprs(o)) || (mcs_is_edge(m_scheme) && mcs_is_edge(o));
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}
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inline GprsCodingScheme::GprsCodingScheme(CodingScheme s)
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: m_scheme(s)
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{
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if (!isValid())
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m_scheme = UNKNOWN;
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}
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inline GprsCodingScheme& GprsCodingScheme::operator =(CodingScheme s)
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{
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m_scheme = s;
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if (!isValid())
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m_scheme = UNKNOWN;
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return *this;
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}
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inline GprsCodingScheme& GprsCodingScheme::operator =(GprsCodingScheme o)
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{
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m_scheme = o.m_scheme;
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return *this;
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}
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inline GprsCodingScheme GprsCodingScheme::getGprsByNum(unsigned num)
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{
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if (num < 1 || num > 4)
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return GprsCodingScheme();
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return GprsCodingScheme(CodingScheme(CS1 + (num - 1)));
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}
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inline GprsCodingScheme GprsCodingScheme::getEgprsByNum(unsigned num)
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{
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if (num < 1 || num > 9)
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return GprsCodingScheme();
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return GprsCodingScheme(CodingScheme(MCS1 + (num - 1)));
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}
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/* The coding schemes form a partial ordering */
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inline bool GprsCodingScheme::operator == (CodingScheme scheme) const
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{
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return this->m_scheme == scheme;
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}
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inline bool operator !=(GprsCodingScheme a, GprsCodingScheme b)
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{
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return !(a == b);
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}
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inline bool operator <(GprsCodingScheme a, GprsCodingScheme b)
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{
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return a.isCompatible(b) && a.to_num() < b.to_num();
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}
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