Jacob Erlbeck | 409f980 | 2015-11-30 18:06:50 +0100 | [diff] [blame] | 1 | /* gprs_coding_scheme.cpp |
| 2 | * |
| 3 | * Copyright (C) 2015 by Sysmocom s.f.m.c. GmbH |
| 4 | * Author: Jacob Erlbeck <jerlbeck@sysmocom.de> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License |
| 8 | * as published by the Free Software Foundation; either version 2 |
| 9 | * of the License, or (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 19 | */ |
| 20 | |
| 21 | |
| 22 | #include "gprs_coding_scheme.h" |
| 23 | |
| 24 | static struct { |
| 25 | struct { |
Jacob Erlbeck | 392a545 | 2015-12-14 10:38:29 +0100 | [diff] [blame] | 26 | unsigned int bytes; |
| 27 | unsigned int ext_bits; |
Jacob Erlbeck | 409f980 | 2015-11-30 18:06:50 +0100 | [diff] [blame] | 28 | } uplink, downlink; |
Jacob Erlbeck | 392a545 | 2015-12-14 10:38:29 +0100 | [diff] [blame] | 29 | unsigned int data_bytes; |
| 30 | unsigned int num_blocks; |
Jacob Erlbeck | 409f980 | 2015-11-30 18:06:50 +0100 | [diff] [blame] | 31 | const char *name; |
Jacob Erlbeck | 6c3dc61 | 2015-12-14 10:21:26 +0100 | [diff] [blame] | 32 | GprsCodingScheme::HeaderType data_hdr; |
Jacob Erlbeck | 409f980 | 2015-11-30 18:06:50 +0100 | [diff] [blame] | 33 | } mcs_info[GprsCodingScheme::NUM_SCHEMES] = { |
Jacob Erlbeck | 392a545 | 2015-12-14 10:38:29 +0100 | [diff] [blame] | 34 | {{0, 0}, {0, 0}, 0, 0, "UNKNOWN", GprsCodingScheme::HEADER_INVALID}, |
| 35 | {{23, 0}, {23, 0}, 20, 1, "CS-1", GprsCodingScheme::HEADER_GPRS_DATA}, |
| 36 | {{33, 7}, {33, 7}, 30, 1, "CS-2", GprsCodingScheme::HEADER_GPRS_DATA}, |
| 37 | {{39, 3}, {39, 3}, 36, 1, "CS-3", GprsCodingScheme::HEADER_GPRS_DATA}, |
| 38 | {{53, 7}, {53, 7}, 50, 1, "CS-4", GprsCodingScheme::HEADER_GPRS_DATA}, |
Jacob Erlbeck | 409f980 | 2015-11-30 18:06:50 +0100 | [diff] [blame] | 39 | |
Jacob Erlbeck | 392a545 | 2015-12-14 10:38:29 +0100 | [diff] [blame] | 40 | {{26, 1}, {26, 1}, 22, 1, "MCS-1", GprsCodingScheme::HEADER_EGPRS_DATA_TYPE_3}, |
| 41 | {{32, 1}, {32, 1}, 28, 1, "MCS-2", GprsCodingScheme::HEADER_EGPRS_DATA_TYPE_3}, |
| 42 | {{41, 1}, {41, 1}, 37, 1, "MCS-3", GprsCodingScheme::HEADER_EGPRS_DATA_TYPE_3}, |
| 43 | {{48, 1}, {48, 1}, 44, 1, "MCS-4", GprsCodingScheme::HEADER_EGPRS_DATA_TYPE_3}, |
Jacob Erlbeck | 409f980 | 2015-11-30 18:06:50 +0100 | [diff] [blame] | 44 | |
Jacob Erlbeck | 392a545 | 2015-12-14 10:38:29 +0100 | [diff] [blame] | 45 | {{60, 7}, {59, 6}, 56, 1, "MCS-5", GprsCodingScheme::HEADER_EGPRS_DATA_TYPE_2}, |
| 46 | {{78, 7}, {77, 6}, 74, 1, "MCS-6", GprsCodingScheme::HEADER_EGPRS_DATA_TYPE_2}, |
| 47 | {{118, 2}, {117, 4}, 56, 2, "MCS-7", GprsCodingScheme::HEADER_EGPRS_DATA_TYPE_1}, |
| 48 | {{142, 2}, {141, 4}, 68, 2, "MCS-8", GprsCodingScheme::HEADER_EGPRS_DATA_TYPE_1}, |
| 49 | {{154, 2}, {153, 4}, 74, 2, "MCS-9", GprsCodingScheme::HEADER_EGPRS_DATA_TYPE_1}, |
Jacob Erlbeck | 409f980 | 2015-11-30 18:06:50 +0100 | [diff] [blame] | 50 | }; |
| 51 | |
| 52 | |
| 53 | GprsCodingScheme GprsCodingScheme::getBySizeUL(unsigned size) |
| 54 | { |
| 55 | switch (size) { |
| 56 | case 23: return GprsCodingScheme(CS1); |
| 57 | case 27: return GprsCodingScheme(MCS1); |
| 58 | case 33: return GprsCodingScheme(MCS2); |
| 59 | case 34: return GprsCodingScheme(CS2); |
| 60 | case 40: return GprsCodingScheme(CS3); |
| 61 | case 42: return GprsCodingScheme(MCS3); |
| 62 | case 49: return GprsCodingScheme(MCS4); |
| 63 | case 54: return GprsCodingScheme(CS4); |
| 64 | case 61: return GprsCodingScheme(MCS5); |
| 65 | case 79: return GprsCodingScheme(MCS6); |
| 66 | case 119: return GprsCodingScheme(MCS7); |
| 67 | case 143: return GprsCodingScheme(MCS8); |
| 68 | case 155: return GprsCodingScheme(MCS9); |
| 69 | } |
| 70 | |
| 71 | return GprsCodingScheme(UNKNOWN); |
| 72 | } |
| 73 | |
| 74 | unsigned int GprsCodingScheme::sizeUL() const |
| 75 | { |
| 76 | return maxBytesUL() + (spareBitsUL() ? 1 : 0); |
| 77 | } |
| 78 | |
| 79 | unsigned int GprsCodingScheme::maxBytesUL() const |
| 80 | { |
| 81 | return mcs_info[m_scheme].uplink.bytes; |
| 82 | } |
| 83 | |
| 84 | unsigned int GprsCodingScheme::spareBitsUL() const |
| 85 | { |
| 86 | return mcs_info[m_scheme].uplink.ext_bits; |
| 87 | } |
| 88 | |
| 89 | unsigned int GprsCodingScheme::sizeDL() const |
| 90 | { |
| 91 | return maxBytesDL() + (spareBitsDL() ? 1 : 0); |
| 92 | } |
| 93 | |
| 94 | unsigned int GprsCodingScheme::maxBytesDL() const |
| 95 | { |
| 96 | return mcs_info[m_scheme].downlink.bytes; |
| 97 | } |
| 98 | |
| 99 | unsigned int GprsCodingScheme::spareBitsDL() const |
| 100 | { |
| 101 | return mcs_info[m_scheme].downlink.ext_bits; |
| 102 | } |
| 103 | |
Jacob Erlbeck | 392a545 | 2015-12-14 10:38:29 +0100 | [diff] [blame] | 104 | unsigned int GprsCodingScheme::maxDataBlockBytes() const |
| 105 | { |
| 106 | return mcs_info[m_scheme].data_bytes; |
| 107 | } |
| 108 | |
| 109 | unsigned int GprsCodingScheme::numDataBlocks() const |
| 110 | { |
| 111 | return mcs_info[m_scheme].num_blocks; |
| 112 | } |
| 113 | |
Jacob Erlbeck | 409f980 | 2015-11-30 18:06:50 +0100 | [diff] [blame] | 114 | const char *GprsCodingScheme::name() const |
| 115 | { |
| 116 | return mcs_info[m_scheme].name; |
| 117 | } |
Jacob Erlbeck | 6c3dc61 | 2015-12-14 10:21:26 +0100 | [diff] [blame] | 118 | |
| 119 | GprsCodingScheme::HeaderType GprsCodingScheme::headerTypeData() const |
| 120 | { |
| 121 | return mcs_info[m_scheme].data_hdr; |
| 122 | } |
Jacob Erlbeck | 4c9e549 | 2016-01-04 16:00:05 +0100 | [diff] [blame^] | 123 | |
| 124 | void GprsCodingScheme::inc(Mode mode) |
| 125 | { |
| 126 | if (!isCompatible(mode)) |
| 127 | /* This should not happen. TODO: Use assert? */ |
| 128 | return; |
| 129 | |
| 130 | Scheme new_cs(Scheme(m_scheme + 1)); |
| 131 | if (!GprsCodingScheme(new_cs).isCompatible(mode)) |
| 132 | /* Clipping, do not change the value */ |
| 133 | return; |
| 134 | |
| 135 | m_scheme = new_cs; |
| 136 | } |
| 137 | |
| 138 | void GprsCodingScheme::dec(Mode mode) |
| 139 | { |
| 140 | if (!isCompatible(mode)) |
| 141 | /* This should not happen. TODO: Use assert? */ |
| 142 | return; |
| 143 | |
| 144 | Scheme new_cs(Scheme(m_scheme - 1)); |
| 145 | if (!GprsCodingScheme(new_cs).isCompatible(mode)) |
| 146 | /* Clipping, do not change the value */ |
| 147 | return; |
| 148 | |
| 149 | m_scheme = new_cs; |
| 150 | } |
| 151 | |
| 152 | void GprsCodingScheme::inc() |
| 153 | { |
| 154 | if (isGprs() && m_scheme == CS4) |
| 155 | return; |
| 156 | |
| 157 | if (isEgprs() && m_scheme == MCS9) |
| 158 | return; |
| 159 | |
| 160 | if (!isValid()) |
| 161 | return; |
| 162 | |
| 163 | m_scheme = Scheme(m_scheme + 1); |
| 164 | } |
| 165 | |
| 166 | void GprsCodingScheme::dec() |
| 167 | { |
| 168 | if (isGprs() && m_scheme == CS1) |
| 169 | return; |
| 170 | |
| 171 | if (isEgprs() && m_scheme == MCS1) |
| 172 | return; |
| 173 | |
| 174 | if (!isValid()) |
| 175 | return; |
| 176 | |
| 177 | m_scheme = Scheme(m_scheme - 1); |
| 178 | } |