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350 lines
10 KiB
350 lines
10 KiB
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Digital Voice Modem - Common Library
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* GPLv2 Open Source. Use is subject to license terms.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* Copyright (C) 2012 Ian Wraith
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* Copyright (C) 2015 Jonathan Naylor, G4KLX
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*
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*/
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#include "Defines.h"
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#include "edac/BPTC19696.h"
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#include "edac/Hamming.h"
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#include "Utils.h"
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using namespace edac;
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#include <cassert>
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// ---------------------------------------------------------------------------
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// Public Class Members
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// ---------------------------------------------------------------------------
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/* Initializes a new instance of the BPTC19696 class. */
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BPTC19696::BPTC19696() :
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m_rawData(nullptr),
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m_deInterData(nullptr)
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{
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m_rawData = new bool[196];
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m_deInterData = new bool[196];
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}
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/* Finalizes a instance of the BPTC19696 class. */
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BPTC19696::~BPTC19696()
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{
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delete[] m_rawData;
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delete[] m_deInterData;
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}
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/* Decode BPTC (196,96) FEC. */
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void BPTC19696::decode(const uint8_t* in, uint8_t* out)
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{
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assert(in != nullptr);
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assert(out != nullptr);
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// get the raw binary
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decodeExtractBinary(in);
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// deinterleave
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decodeDeInterleave();
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// error check
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decodeErrorCheck();
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// extract Data
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decodeExtractData(out);
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}
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/* Encode BPTC (196,96) FEC. */
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void BPTC19696::encode(const uint8_t* in, uint8_t* out)
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{
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assert(in != nullptr);
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assert(out != nullptr);
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// extract Data
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encodeExtractData(in);
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// error check
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encodeErrorCheck();
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// interleave
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encodeInterleave();
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// get the raw binary
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encodeExtractBinary(out);
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}
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// ---------------------------------------------------------------------------
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// Private Class Members
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// ---------------------------------------------------------------------------
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/* */
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void BPTC19696::decodeExtractBinary(const uint8_t* in)
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{
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// first block
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Utils::byteToBitsBE(in[0U], m_rawData + 0U);
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Utils::byteToBitsBE(in[1U], m_rawData + 8U);
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Utils::byteToBitsBE(in[2U], m_rawData + 16U);
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Utils::byteToBitsBE(in[3U], m_rawData + 24U);
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Utils::byteToBitsBE(in[4U], m_rawData + 32U);
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Utils::byteToBitsBE(in[5U], m_rawData + 40U);
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Utils::byteToBitsBE(in[6U], m_rawData + 48U);
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Utils::byteToBitsBE(in[7U], m_rawData + 56U);
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Utils::byteToBitsBE(in[8U], m_rawData + 64U);
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Utils::byteToBitsBE(in[9U], m_rawData + 72U);
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Utils::byteToBitsBE(in[10U], m_rawData + 80U);
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Utils::byteToBitsBE(in[11U], m_rawData + 88U);
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Utils::byteToBitsBE(in[12U], m_rawData + 96U);
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// handle the two bits
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bool bits[8U];
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Utils::byteToBitsBE(in[20U], bits);
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m_rawData[98U] = bits[6U];
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m_rawData[99U] = bits[7U];
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// second block
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Utils::byteToBitsBE(in[21U], m_rawData + 100U);
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Utils::byteToBitsBE(in[22U], m_rawData + 108U);
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Utils::byteToBitsBE(in[23U], m_rawData + 116U);
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Utils::byteToBitsBE(in[24U], m_rawData + 124U);
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Utils::byteToBitsBE(in[25U], m_rawData + 132U);
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Utils::byteToBitsBE(in[26U], m_rawData + 140U);
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Utils::byteToBitsBE(in[27U], m_rawData + 148U);
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Utils::byteToBitsBE(in[28U], m_rawData + 156U);
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Utils::byteToBitsBE(in[29U], m_rawData + 164U);
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Utils::byteToBitsBE(in[30U], m_rawData + 172U);
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Utils::byteToBitsBE(in[31U], m_rawData + 180U);
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Utils::byteToBitsBE(in[32U], m_rawData + 188U);
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}
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/* */
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void BPTC19696::decodeDeInterleave()
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{
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for (uint32_t i = 0U; i < 196U; i++)
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m_deInterData[i] = false;
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// the first bit is R(3) which is not used so can be ignored
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for (uint32_t a = 0U; a < 196U; a++) {
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// calculate the interleave sequence
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uint32_t interleaveSequence = (a * 181U) % 196U;
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// shuffle the data
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m_deInterData[a] = m_rawData[interleaveSequence];
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}
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}
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/* */
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void BPTC19696::decodeErrorCheck()
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{
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bool fixing;
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uint32_t count = 0U;
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do {
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fixing = false;
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// run through each of the 15 columns
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bool col[13U];
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for (uint32_t c = 0U; c < 15U; c++) {
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uint32_t pos = c + 1U;
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for (uint32_t a = 0U; a < 13U; a++) {
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col[a] = m_deInterData[pos];
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pos = pos + 15U;
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}
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if (Hamming::decode1393(col)) {
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uint32_t pos = c + 1U;
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for (uint32_t a = 0U; a < 13U; a++) {
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m_deInterData[pos] = col[a];
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pos = pos + 15U;
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}
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fixing = true;
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}
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}
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// run through each of the 9 rows containing data
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for (uint32_t r = 0U; r < 9U; r++) {
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uint32_t pos = (r * 15U) + 1U;
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if (Hamming::decode15113_2(m_deInterData + pos))
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fixing = true;
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}
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count++;
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} while (fixing && count < 5U);
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}
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/* */
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void BPTC19696::decodeExtractData(uint8_t* data) const
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{
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bool bData[96U];
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uint32_t pos = 0U;
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for (uint32_t a = 4U; a <= 11U; a++, pos++)
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bData[pos] = m_deInterData[a];
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for (uint32_t a = 16U; a <= 26U; a++, pos++)
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bData[pos] = m_deInterData[a];
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for (uint32_t a = 31U; a <= 41U; a++, pos++)
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bData[pos] = m_deInterData[a];
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for (uint32_t a = 46U; a <= 56U; a++, pos++)
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bData[pos] = m_deInterData[a];
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for (uint32_t a = 61U; a <= 71U; a++, pos++)
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bData[pos] = m_deInterData[a];
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for (uint32_t a = 76U; a <= 86U; a++, pos++)
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bData[pos] = m_deInterData[a];
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for (uint32_t a = 91U; a <= 101U; a++, pos++)
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bData[pos] = m_deInterData[a];
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for (uint32_t a = 106U; a <= 116U; a++, pos++)
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bData[pos] = m_deInterData[a];
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for (uint32_t a = 121U; a <= 131U; a++, pos++)
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bData[pos] = m_deInterData[a];
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Utils::bitsToByteBE(bData + 0U, data[0U]);
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Utils::bitsToByteBE(bData + 8U, data[1U]);
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Utils::bitsToByteBE(bData + 16U, data[2U]);
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Utils::bitsToByteBE(bData + 24U, data[3U]);
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Utils::bitsToByteBE(bData + 32U, data[4U]);
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Utils::bitsToByteBE(bData + 40U, data[5U]);
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Utils::bitsToByteBE(bData + 48U, data[6U]);
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Utils::bitsToByteBE(bData + 56U, data[7U]);
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Utils::bitsToByteBE(bData + 64U, data[8U]);
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Utils::bitsToByteBE(bData + 72U, data[9U]);
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Utils::bitsToByteBE(bData + 80U, data[10U]);
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Utils::bitsToByteBE(bData + 88U, data[11U]);
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}
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/* */
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void BPTC19696::encodeExtractData(const uint8_t* in) const
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{
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bool bData[96U];
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Utils::byteToBitsBE(in[0U], bData + 0U);
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Utils::byteToBitsBE(in[1U], bData + 8U);
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Utils::byteToBitsBE(in[2U], bData + 16U);
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Utils::byteToBitsBE(in[3U], bData + 24U);
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Utils::byteToBitsBE(in[4U], bData + 32U);
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Utils::byteToBitsBE(in[5U], bData + 40U);
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Utils::byteToBitsBE(in[6U], bData + 48U);
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Utils::byteToBitsBE(in[7U], bData + 56U);
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Utils::byteToBitsBE(in[8U], bData + 64U);
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Utils::byteToBitsBE(in[9U], bData + 72U);
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Utils::byteToBitsBE(in[10U], bData + 80U);
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Utils::byteToBitsBE(in[11U], bData + 88U);
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for (uint32_t i = 0U; i < 196U; i++)
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m_deInterData[i] = false;
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uint32_t pos = 0U;
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for (uint32_t a = 4U; a <= 11U; a++, pos++)
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m_deInterData[a] = bData[pos];
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for (uint32_t a = 16U; a <= 26U; a++, pos++)
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m_deInterData[a] = bData[pos];
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for (uint32_t a = 31U; a <= 41U; a++, pos++)
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m_deInterData[a] = bData[pos];
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for (uint32_t a = 46U; a <= 56U; a++, pos++)
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m_deInterData[a] = bData[pos];
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for (uint32_t a = 61U; a <= 71U; a++, pos++)
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m_deInterData[a] = bData[pos];
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for (uint32_t a = 76U; a <= 86U; a++, pos++)
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m_deInterData[a] = bData[pos];
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for (uint32_t a = 91U; a <= 101U; a++, pos++)
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m_deInterData[a] = bData[pos];
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for (uint32_t a = 106U; a <= 116U; a++, pos++)
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m_deInterData[a] = bData[pos];
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for (uint32_t a = 121U; a <= 131U; a++, pos++)
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m_deInterData[a] = bData[pos];
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}
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/* */
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void BPTC19696::encodeErrorCheck()
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{
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// run through each of the 9 rows containing data
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for (uint32_t r = 0U; r < 9U; r++) {
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uint32_t pos = (r * 15U) + 1U;
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Hamming::encode15113_2(m_deInterData + pos);
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}
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// run through each of the 15 columns
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bool col[13U];
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for (uint32_t c = 0U; c < 15U; c++) {
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uint32_t pos = c + 1U;
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for (uint32_t a = 0U; a < 13U; a++) {
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col[a] = m_deInterData[pos];
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pos = pos + 15U;
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}
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Hamming::encode1393(col);
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pos = c + 1U;
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for (uint32_t a = 0U; a < 13U; a++) {
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m_deInterData[pos] = col[a];
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pos = pos + 15U;
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}
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}
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}
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/* */
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void BPTC19696::encodeInterleave()
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{
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for (uint32_t i = 0U; i < 196U; i++)
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m_rawData[i] = false;
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// the first bit is R(3) which is not used so can be ignored
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for (uint32_t a = 0U; a < 196U; a++) {
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// calculate the interleave sequence
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uint32_t interleaveSequence = (a * 181U) % 196U;
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// unshuffle the data
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m_rawData[interleaveSequence] = m_deInterData[a];
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}
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}
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/* */
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void BPTC19696::encodeExtractBinary(uint8_t* data)
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{
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// first block
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Utils::bitsToByteBE(m_rawData + 0U, data[0U]);
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Utils::bitsToByteBE(m_rawData + 8U, data[1U]);
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Utils::bitsToByteBE(m_rawData + 16U, data[2U]);
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Utils::bitsToByteBE(m_rawData + 24U, data[3U]);
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Utils::bitsToByteBE(m_rawData + 32U, data[4U]);
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Utils::bitsToByteBE(m_rawData + 40U, data[5U]);
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Utils::bitsToByteBE(m_rawData + 48U, data[6U]);
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Utils::bitsToByteBE(m_rawData + 56U, data[7U]);
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Utils::bitsToByteBE(m_rawData + 64U, data[8U]);
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Utils::bitsToByteBE(m_rawData + 72U, data[9U]);
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Utils::bitsToByteBE(m_rawData + 80U, data[10U]);
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Utils::bitsToByteBE(m_rawData + 88U, data[11U]);
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// handle the two bits
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uint8_t byte;
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Utils::bitsToByteBE(m_rawData + 96U, byte);
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data[12U] = (data[12U] & 0x3FU) | ((byte >> 0) & 0xC0U);
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data[20U] = (data[20U] & 0xFCU) | ((byte >> 4) & 0x03U);
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// second block
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Utils::bitsToByteBE(m_rawData + 100U, data[21U]);
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Utils::bitsToByteBE(m_rawData + 108U, data[22U]);
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Utils::bitsToByteBE(m_rawData + 116U, data[23U]);
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Utils::bitsToByteBE(m_rawData + 124U, data[24U]);
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Utils::bitsToByteBE(m_rawData + 132U, data[25U]);
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Utils::bitsToByteBE(m_rawData + 140U, data[26U]);
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Utils::bitsToByteBE(m_rawData + 148U, data[27U]);
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Utils::bitsToByteBE(m_rawData + 156U, data[28U]);
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Utils::bitsToByteBE(m_rawData + 164U, data[29U]);
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Utils::bitsToByteBE(m_rawData + 172U, data[30U]);
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Utils::bitsToByteBE(m_rawData + 180U, data[31U]);
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Utils::bitsToByteBE(m_rawData + 188U, data[32U]);
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}
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