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273 lines
7.3 KiB
273 lines
7.3 KiB
9 years ago
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/*
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* Copyright (C) 2016 Jonathan Naylor, G4KLX
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* Copyright (C) 2016 Mathias Weyland, HB9FRV
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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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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#include "YSFConvolution.h"
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#include "YSFPayload.h"
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#include "YSFDefines.h"
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#include "Utils.h"
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#include "CRC.h"
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#include "Log.h"
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#include <cstdio>
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#include <cassert>
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#include <cstring>
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#include <cstdint>
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const unsigned int INTERLEAVE_TABLE_9_20[] = {
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0U, 40U, 80U, 120U, 160U, 200U, 240U, 280U, 320U,
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2U, 42U, 82U, 122U, 162U, 202U, 242U, 282U, 322U,
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4U, 44U, 84U, 124U, 164U, 204U, 244U, 284U, 324U,
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6U, 46U, 86U, 126U, 166U, 206U, 246U, 286U, 326U,
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8U, 48U, 88U, 128U, 168U, 208U, 248U, 288U, 328U,
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10U, 50U, 90U, 130U, 170U, 210U, 250U, 290U, 330U,
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12U, 52U, 92U, 132U, 172U, 212U, 252U, 292U, 332U,
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14U, 54U, 94U, 134U, 174U, 214U, 254U, 294U, 334U,
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16U, 56U, 96U, 136U, 176U, 216U, 256U, 296U, 336U,
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18U, 58U, 98U, 138U, 178U, 218U, 258U, 298U, 338U,
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20U, 60U, 100U, 140U, 180U, 220U, 260U, 300U, 340U,
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22U, 62U, 102U, 142U, 182U, 222U, 262U, 302U, 342U,
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24U, 64U, 104U, 144U, 184U, 224U, 264U, 304U, 344U,
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26U, 66U, 106U, 146U, 186U, 226U, 266U, 306U, 346U,
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28U, 68U, 108U, 148U, 188U, 228U, 268U, 308U, 348U,
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30U, 70U, 110U, 150U, 190U, 230U, 270U, 310U, 350U,
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32U, 72U, 112U, 152U, 192U, 232U, 272U, 312U, 352U,
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34U, 74U, 114U, 154U, 194U, 234U, 274U, 314U, 354U,
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36U, 76U, 116U, 156U, 196U, 236U, 276U, 316U, 356U,
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38U, 78U, 118U, 158U, 198U, 238U, 278U, 318U, 358U};
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const unsigned int INTERLEAVE_TABLE_5_20[] = {
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0U, 40U, 80U, 120U, 160U,
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2U, 42U, 82U, 122U, 162U,
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4U, 44U, 84U, 124U, 164U,
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6U, 46U, 86U, 126U, 166U,
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8U, 48U, 88U, 128U, 168U,
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10U, 50U, 90U, 130U, 170U,
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12U, 52U, 92U, 132U, 172U,
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14U, 54U, 94U, 134U, 174U,
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16U, 56U, 96U, 136U, 176U,
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18U, 58U, 98U, 138U, 178U,
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20U, 60U, 100U, 140U, 180U,
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22U, 62U, 102U, 142U, 182U,
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24U, 64U, 104U, 144U, 184U,
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26U, 66U, 106U, 146U, 186U,
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28U, 68U, 108U, 148U, 188U,
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30U, 70U, 110U, 150U, 190U,
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32U, 72U, 112U, 152U, 192U,
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34U, 74U, 114U, 154U, 194U,
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36U, 76U, 116U, 156U, 196U,
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38U, 78U, 118U, 158U, 198U};
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// This one differs from the others in that it interleaves bits and not dibits
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const unsigned int INTERLEAVE_TABLE_26_4[] = {
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0U, 4U, 8U, 12U, 16U, 20U, 24U, 28U, 32U, 36U, 40U, 44U, 48U, 52U, 56U, 60U, 64U, 68U, 72U, 76U, 80U, 84U, 88U, 92U, 96U, 100U,
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1U, 5U, 9U, 13U, 17U, 21U, 25U, 29U, 33U, 37U, 41U, 45U, 49U, 53U, 57U, 61U, 65U, 69U, 73U, 77U, 81U, 85U, 89U, 93U, 97U, 101U,
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2U, 6U, 10U, 14U, 18U, 22U, 26U, 30U, 34U, 38U, 42U, 46U, 50U, 54U, 58U, 62U, 66U, 70U, 74U, 78U, 82U, 86U, 90U, 94U, 98U, 102U,
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3U, 7U, 11U, 15U, 19U, 23U, 27U, 31U, 35U, 39U, 43U, 47U, 51U, 55U, 59U, 63U, 67U, 71U, 75U, 79U, 83U, 87U, 91U, 95U, 99U, 103U};
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const unsigned char WHITENING_DATA[] = {0x93U, 0xD7U, 0x51U, 0x21U, 0x9CU, 0x2FU, 0x6CU, 0xD0U, 0xEFU, 0x0FU,
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0xF8U, 0x3DU, 0xF1U, 0x73U, 0x20U, 0x94U, 0xEDU, 0x1EU, 0x7CU, 0xD8U};
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const unsigned char BIT_MASK_TABLE[] = {0x80U, 0x40U, 0x20U, 0x10U, 0x08U, 0x04U, 0x02U, 0x01U};
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#define WRITE_BIT1(p,i,b) p[(i)>>3] = (b) ? (p[(i)>>3] | BIT_MASK_TABLE[(i)&7]) : (p[(i)>>3] & ~BIT_MASK_TABLE[(i)&7])
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#define READ_BIT1(p,i) (p[(i)>>3] & BIT_MASK_TABLE[(i)&7])
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CYSFPayload::CYSFPayload()
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{
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}
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CYSFPayload::~CYSFPayload()
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{
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}
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bool CYSFPayload::readVDMode1Data(const unsigned char* data, unsigned char* dt)
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{
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assert(data != NULL);
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assert(dt != NULL);
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data += YSF_SYNC_LENGTH_BYTES + YSF_FICH_LENGTH_BYTES;
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unsigned char dch[45U];
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const unsigned char* p1 = data;
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unsigned char* p2 = dch;
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for (unsigned int i = 0U; i < 5U; i++) {
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::memcpy(p2, p1, 9U);
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p1 += 18U; p2 += 9U;
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}
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CYSFConvolution conv;
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conv.start();
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for (unsigned int i = 0U; i < 180U; i++) {
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unsigned int n = INTERLEAVE_TABLE_9_20[i];
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uint8_t s0 = READ_BIT1(dch, n) ? 1U : 0U;
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n++;
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uint8_t s1 = READ_BIT1(dch, n) ? 1U : 0U;
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conv.decode(s0, s1);
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}
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unsigned char output[23U];
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conv.chainback(output, 176U);
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bool ret = CCRC::checkCCITT162(output, 22U);
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if (ret) {
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for (unsigned int i = 0U; i < 20U; i++)
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output[i] ^= WHITENING_DATA[i];
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CUtils::dump(1U, "V/D Mode 1 Data", output, 20U);
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::memcpy(dt, output, 20U);
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}
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return ret;
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}
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bool CYSFPayload::readVDMode2Data(const unsigned char* data, unsigned char* dt)
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{
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assert(data != NULL);
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assert(dt != NULL);
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data += YSF_SYNC_LENGTH_BYTES + YSF_FICH_LENGTH_BYTES;
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unsigned char dch[25U];
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const unsigned char* p1 = data;
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unsigned char* p2 = dch;
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for (unsigned int i = 0U; i < 5U; i++) {
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::memcpy(p2, p1, 5U);
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p1 += 18U; p2 += 5U;
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}
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CYSFConvolution conv;
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conv.start();
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for (unsigned int i = 0U; i < 100U; i++) {
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unsigned int n = INTERLEAVE_TABLE_5_20[i];
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uint8_t s0 = READ_BIT1(dch, n) ? 1U : 0U;
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n++;
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uint8_t s1 = READ_BIT1(dch, n) ? 1U : 0U;
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conv.decode(s0, s1);
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}
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unsigned char output[13U];
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conv.chainback(output, 96U);
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bool ret = CCRC::checkCCITT162(output, 12U);
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if (ret) {
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for (unsigned int i = 0U; i < 10U; i++)
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output[i] ^= WHITENING_DATA[i];
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CUtils::dump(1U, "V/D Mode 2 Data", output, YSF_CALLSIGN_LENGTH);
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::memcpy(dt, output, YSF_CALLSIGN_LENGTH);
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}
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return ret;
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}
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bool CYSFPayload::readDataFRModeData1(const unsigned char* data, unsigned char* dt)
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{
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assert(data != NULL);
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assert(dt != NULL);
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data += YSF_SYNC_LENGTH_BYTES + YSF_FICH_LENGTH_BYTES;
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unsigned char dch[45U];
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const unsigned char* p1 = data;
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unsigned char* p2 = dch;
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for (unsigned int i = 0U; i < 5U; i++) {
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::memcpy(p2, p1, 9U);
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p1 += 18U; p2 += 9U;
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}
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CYSFConvolution conv;
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conv.start();
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for (unsigned int i = 0U; i < 180U; i++) {
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unsigned int n = INTERLEAVE_TABLE_9_20[i];
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uint8_t s0 = READ_BIT1(dch, n) ? 1U : 0U;
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n++;
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uint8_t s1 = READ_BIT1(dch, n) ? 1U : 0U;
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conv.decode(s0, s1);
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}
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unsigned char output[23U];
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conv.chainback(output, 176U);
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bool ret = CCRC::checkCCITT162(output, 22U);
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if (ret) {
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for (unsigned int i = 0U; i < 20U; i++)
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output[i] ^= WHITENING_DATA[i];
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CUtils::dump(1U, "FR Mode Data 1", output, 20U);
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::memcpy(dt, output, 20U);
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}
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return ret;
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}
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bool CYSFPayload::readDataFRModeData2(const unsigned char* data, unsigned char* dt)
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{
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assert(data != NULL);
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assert(dt != NULL);
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data += YSF_SYNC_LENGTH_BYTES + YSF_FICH_LENGTH_BYTES;
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unsigned char dch[45U];
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const unsigned char* p1 = data + 9U;
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unsigned char* p2 = dch;
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for (unsigned int i = 0U; i < 5U; i++) {
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::memcpy(p2, p1, 9U);
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p1 += 18U; p2 += 9U;
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}
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CYSFConvolution conv;
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conv.start();
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for (unsigned int i = 0U; i < 180U; i++) {
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unsigned int n = INTERLEAVE_TABLE_9_20[i];
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uint8_t s0 = READ_BIT1(dch, n) ? 1U : 0U;
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n++;
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uint8_t s1 = READ_BIT1(dch, n) ? 1U : 0U;
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conv.decode(s0, s1);
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}
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unsigned char output[23U];
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conv.chainback(output, 176U);
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bool ret = CCRC::checkCCITT162(output, 22U);
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if (ret) {
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for (unsigned int i = 0U; i < 20U; i++)
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output[i] ^= WHITENING_DATA[i];
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CUtils::dump(1U, "FR Mode Data 2", output, 20U);
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::memcpy(dt, output, 20U);
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}
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return ret;
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}
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