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124 lines
3.9 KiB
124 lines
3.9 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) 2021 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(__P25_UTILS_H__)
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#define __P25_UTILS_H__
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#include "Defines.h"
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namespace p25
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{
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// ---------------------------------------------------------------------------
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// Class Declaration
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// This class implements various helper functions for validating and
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// for interleaving P25 data.
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// ---------------------------------------------------------------------------
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class HOST_SW_API P25Utils {
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public:
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/// <summary>Helper to test and clamp a P25 NAC.</summary>
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static uint32_t nac(uint32_t nac)
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{
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if (nac < 0U) { // clamp to $000
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nac = 0U;
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}
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if (nac > 0xF7DU) { // clamp to $F7D
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nac = 0xF7DU;
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}
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return nac;
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}
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/// <summary>Helper to test and clamp a P25 site ID.</summary>
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static uint8_t siteId(uint8_t id)
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{
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if (id == 0U) { // clamp to 1
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id = 1U;
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}
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if (id > 0xFEU) { // clamp to $FE
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id = 0xFEU;
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}
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return id;
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}
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/// <summary>Helper to test and clamp a P25 network ID.</summary>
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static uint32_t netId(uint32_t id)
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{
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if (id == 0U) { // clamp to 1
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id = 1U;
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}
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if (id > 0xFFFFEU) { // clamp to $FFFFE
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id = 0xFFFFEU;
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}
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return id;
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}
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/// <summary>Helper to test and clamp a P25 system ID.</summary>
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static uint32_t sysId(uint32_t id)
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{
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if (id == 0U) { // clamp to 1
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id = 1U;
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}
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if (id > 0xFFEU) { // clamp to $FFE
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id = 0xFFEU;
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}
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return id;
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}
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/// <summary>Helper to test and clamp a P25 RFSS ID.</summary>
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static uint8_t rfssId(uint8_t id)
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{
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if (id == 0U) { // clamp to 1
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id = 1U;
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}
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if (id > 0xFEU) { // clamp to $FE
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id = 0xFEU;
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}
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return id;
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}
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/// <summary>Decode bit interleaving.</summary>
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static uint32_t decode(const uint8_t* in, uint8_t* out, uint32_t start, uint32_t stop);
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/// <summary>Encode bit interleaving.</summary>
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static uint32_t encode(const uint8_t* in, uint8_t* out, uint32_t start, uint32_t stop);
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/// <summary>Encode bit interleaving for a given length.</summary>
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static uint32_t encode(const uint8_t* in, uint8_t* out, uint32_t length);
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/// <summary>Compare two datasets for the given length.</summary>
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static uint32_t compare(const uint8_t* data1, const uint8_t* data2, uint32_t length);
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};
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} // namespace p25
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#endif // __P25_UTILS_H__
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