123 lines
3.8 KiB
C++
123 lines
3.8 KiB
C++
/* gprs_coding_scheme.cpp
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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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#include "gprs_coding_scheme.h"
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static struct {
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struct {
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unsigned int bytes;
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unsigned int ext_bits;
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} uplink, downlink;
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unsigned int data_bytes;
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unsigned int num_blocks;
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const char *name;
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GprsCodingScheme::HeaderType data_hdr;
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} mcs_info[GprsCodingScheme::NUM_SCHEMES] = {
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{{0, 0}, {0, 0}, 0, 0, "UNKNOWN", GprsCodingScheme::HEADER_INVALID},
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{{23, 0}, {23, 0}, 20, 1, "CS-1", GprsCodingScheme::HEADER_GPRS_DATA},
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{{33, 7}, {33, 7}, 30, 1, "CS-2", GprsCodingScheme::HEADER_GPRS_DATA},
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{{39, 3}, {39, 3}, 36, 1, "CS-3", GprsCodingScheme::HEADER_GPRS_DATA},
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{{53, 7}, {53, 7}, 50, 1, "CS-4", GprsCodingScheme::HEADER_GPRS_DATA},
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{{26, 1}, {26, 1}, 22, 1, "MCS-1", GprsCodingScheme::HEADER_EGPRS_DATA_TYPE_3},
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{{32, 1}, {32, 1}, 28, 1, "MCS-2", GprsCodingScheme::HEADER_EGPRS_DATA_TYPE_3},
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{{41, 1}, {41, 1}, 37, 1, "MCS-3", GprsCodingScheme::HEADER_EGPRS_DATA_TYPE_3},
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{{48, 1}, {48, 1}, 44, 1, "MCS-4", GprsCodingScheme::HEADER_EGPRS_DATA_TYPE_3},
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{{60, 7}, {59, 6}, 56, 1, "MCS-5", GprsCodingScheme::HEADER_EGPRS_DATA_TYPE_2},
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{{78, 7}, {77, 6}, 74, 1, "MCS-6", GprsCodingScheme::HEADER_EGPRS_DATA_TYPE_2},
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{{118, 2}, {117, 4}, 56, 2, "MCS-7", GprsCodingScheme::HEADER_EGPRS_DATA_TYPE_1},
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{{142, 2}, {141, 4}, 68, 2, "MCS-8", GprsCodingScheme::HEADER_EGPRS_DATA_TYPE_1},
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{{154, 2}, {153, 4}, 74, 2, "MCS-9", GprsCodingScheme::HEADER_EGPRS_DATA_TYPE_1},
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};
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GprsCodingScheme GprsCodingScheme::getBySizeUL(unsigned size)
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{
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switch (size) {
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case 23: return GprsCodingScheme(CS1);
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case 27: return GprsCodingScheme(MCS1);
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case 33: return GprsCodingScheme(MCS2);
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case 34: return GprsCodingScheme(CS2);
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case 40: return GprsCodingScheme(CS3);
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case 42: return GprsCodingScheme(MCS3);
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case 49: return GprsCodingScheme(MCS4);
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case 54: return GprsCodingScheme(CS4);
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case 61: return GprsCodingScheme(MCS5);
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case 79: return GprsCodingScheme(MCS6);
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case 119: return GprsCodingScheme(MCS7);
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case 143: return GprsCodingScheme(MCS8);
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case 155: return GprsCodingScheme(MCS9);
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}
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return GprsCodingScheme(UNKNOWN);
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}
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unsigned int GprsCodingScheme::sizeUL() const
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{
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return maxBytesUL() + (spareBitsUL() ? 1 : 0);
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}
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unsigned int GprsCodingScheme::maxBytesUL() const
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{
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return mcs_info[m_scheme].uplink.bytes;
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}
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unsigned int GprsCodingScheme::spareBitsUL() const
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{
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return mcs_info[m_scheme].uplink.ext_bits;
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}
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unsigned int GprsCodingScheme::sizeDL() const
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{
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return maxBytesDL() + (spareBitsDL() ? 1 : 0);
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}
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unsigned int GprsCodingScheme::maxBytesDL() const
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{
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return mcs_info[m_scheme].downlink.bytes;
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}
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unsigned int GprsCodingScheme::spareBitsDL() const
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{
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return mcs_info[m_scheme].downlink.ext_bits;
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}
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unsigned int GprsCodingScheme::maxDataBlockBytes() const
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{
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return mcs_info[m_scheme].data_bytes;
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}
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unsigned int GprsCodingScheme::numDataBlocks() const
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{
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return mcs_info[m_scheme].num_blocks;
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}
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const char *GprsCodingScheme::name() const
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{
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return mcs_info[m_scheme].name;
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}
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GprsCodingScheme::HeaderType GprsCodingScheme::headerTypeData() const
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{
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return mcs_info[m_scheme].data_hdr;
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}
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