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81 lines
2.9 KiB
81 lines
2.9 KiB
/**
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* Digital Voice Modem - Host Software
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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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* @package DVM / Host Software
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*
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*/
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//
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// Based on code from the MMDVMHost project. (https://github.com/g4klx/MMDVMHost)
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// Licensed under the GPLv2 License (https://opensource.org/licenses/GPL-2.0)
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//
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/*
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* Copyright (C) 2016 by Jonathan Naylor G4KLX
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* Copyright (C) 2017 by Bryan Biedenkapp N2PLL
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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; either version 2 of the License, or
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* (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., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#if !defined(__RS634717_H__)
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#define __RS634717_H__
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#include "Defines.h"
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namespace edac
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{
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// ---------------------------------------------------------------------------
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// Class Declaration
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// Implements Reed-Solomon (63,47,17). Which is also used to implement
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// Reed-Solomon (24,12,13), (24,16,9) and (36,20,17) forward
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// error correction.
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// ---------------------------------------------------------------------------
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class HOST_SW_API RS634717 {
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public:
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/// <summary>Initializes a new instance of the RS634717 class.</summary>
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RS634717();
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/// <summary>Finalizes a instance of the RS634717 class.</summary>
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~RS634717();
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/// <summary>Decode RS (24,12,13) FEC.</summary>
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bool decode241213(uint8_t* data);
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/// <summary>Encode RS (24,12,13) FEC.</summary>
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void encode241213(uint8_t* data);
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/// <summary>Decode RS (24,16,9) FEC.</summary>
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bool decode24169(uint8_t* data);
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/// <summary>Encode RS (24,16,9) FEC.</summary>
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void encode24169(uint8_t* data);
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/// <summary>Decode RS (36,20,17) FEC.</summary>
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bool decode362017(uint8_t* data);
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/// <summary>Encode RS (36,20,17) FEC.</summary>
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void encode362017(uint8_t* data);
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private:
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/// <summary></summary>
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static uint8_t bin2Hex(const uint8_t* input, uint32_t offset);
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/// <summary></summary>
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static void hex2Bin(uint8_t input, uint8_t* output, uint32_t offset);
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/// <summary></summary>
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uint8_t gf6Mult(uint8_t a, uint8_t b) const;
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/// <summary>Decode variable length Reed-Solomon FEC.</summary>
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bool decode(uint8_t* data, const uint32_t bitLength, const int firstData, const int roots);
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};
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} // namespace edac
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#endif // __RS634717_H__
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