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145 lines
4.0 KiB
145 lines
4.0 KiB
/**
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* Digital Voice Modem - Fixed Network Equipment
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* AGPLv3 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 / Fixed Network Equipment
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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) 2022 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 Affero General Public License as published by
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* the Free Software Foundation, either version 3 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 Affero General Public License for more details.
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*/
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using System;
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namespace fnecore.DMR
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{
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/// <summary>
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/// Represents DMR privacy indicator link control data.
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/// </summary>
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public class PrivacyLC
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{
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private byte[] mi;
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/// <summary>
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/// Feature ID.
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/// </summary>
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public byte FID;
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/// <summary>
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/// Destination ID.
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/// </summary>
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public uint DstId;
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/** Service Options */
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/// <summary>
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/// Flag indicating a group/talkgroup operation.
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/// </summary>
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public bool Group;
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/** Encryption Data */
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/// <summary>
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/// Encryption algorithm ID.
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/// </summary>
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public byte AlgId;
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/// <summary>
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/// Encryption key ID.
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/// </summary>
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public uint KId;
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/*
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** Methods
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*/
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/// <summary>
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/// Initializes a new instance of the <see cref="PrivacyLC"/> class.
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/// </summary>
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public PrivacyLC()
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{
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mi = new byte[4];
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FID = 0;
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DstId = 0;
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Group = false;
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AlgId = 0;
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KId = 0;
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}
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/// <summary>
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/// Initializes a new instance of the <see cref="PrivacyLC"/> class.
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/// </summary>
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/// <param name="bytes"></param>
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public PrivacyLC(byte[] bytes)
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{
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mi = new byte[4];
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Group = (bytes[0U] & 0x20U) == 0x20U;
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AlgId = (byte)(bytes[0U] & 7); // Algorithm ID
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FID = bytes[1U];
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KId = bytes[2U];
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mi[0U] = bytes[3U];
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mi[1U] = bytes[4U];
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mi[2U] = bytes[5U];
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mi[3U] = bytes[6U];
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DstId = (uint)(bytes[7U] << 16 | bytes[8U] << 8 | bytes[9U]); // Destination Address
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}
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/// <summary>
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/// Gets LC data as bytes.
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/// </summary>
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/// <returns></returns>
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public byte[] GetBytes()
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{
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byte[] lcData = new byte[12];
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GetData(ref lcData);
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return lcData;
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}
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/// <summary>
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/// Gets LC data as bytes.
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/// </summary>
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/// <param name="bytes"></param>
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public void GetData(ref byte[] bytes)
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{
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if (bytes == null)
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throw new NullReferenceException("bytes");
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bytes[0U] = (byte)((Group ? 0x20U : 0x00U) +
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(AlgId & 0x07U)); // Algorithm ID
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bytes[1U] = FID;
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bytes[2U] = (byte)KId;
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bytes[3U] = mi[0U];
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bytes[4U] = mi[1U];
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bytes[5U] = mi[2U];
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bytes[6U] = mi[3U];
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bytes[7U] = (byte)(DstId >> 16); // Destination Address
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bytes[8U] = (byte)(DstId >> 8); // ..
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bytes[9U] = (byte)(DstId >> 0); // ..
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}
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} // public class PrivacyLC
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} // namespace fnecore.DMR
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