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76 lines
2.4 KiB
76 lines
2.4 KiB
// SPDX-License-Identifier: AGPL-3.0-only
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/**
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* Digital Voice Modem - Fixed Network Equipment Core Library
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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 Core Library
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* @license AGPLv3 License (https://opensource.org/licenses/AGPL-3.0)
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*
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* Copyright (C) 2025 Caleb, K4PHP
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*
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*/
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using System;
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namespace fnecore.P25.KMM
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{
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/// <summary>
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/// KMM Frame base class
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/// </summary>
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public class KmmFrame
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{
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public byte MessageId { get; set; }
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public ushort MessageLength { get; set; }
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public byte RespKind { get; private set; } = 0;
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public bool Complete { get; private set; } = true;
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public ushort DstLlId { get; private set; }
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public ushort SrcLlId { get; private set; }
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/// <summary>
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/// Creates an instance of <see cref="KmmFrame"/>
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/// </summary>
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public KmmFrame() { /* sub */ }
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/// <summary>
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/// KMM Frame length
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/// </summary>
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public virtual ushort Length => P25Defines.KMM_FRAME_LENGTH;
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/// <summary>
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/// Encode KMM Frame Header
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/// </summary>
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/// <param name="data"></param>
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/// <exception cref="ArgumentException"></exception>
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protected void EncodeHeader(byte[] data)
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{
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if (data.Length < 8)
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throw new ArgumentException("Data buffer too small");
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data[0] = MessageId;
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FneUtils.WriteBytes(Length, ref data, 1);
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data[3] = (byte)((RespKind << 6) | (Complete ? 0x00 : 0x01));
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FneUtils.WriteBytes(DstLlId, ref data, 4);
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FneUtils.WriteBytes(SrcLlId, ref data, 6);
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}
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/// <summary>
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/// Decode KMM Frame Header
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/// </summary>
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/// <param name="data"></param>
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/// <exception cref="ArgumentException"></exception>
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protected void DecodeHeader(byte[] data)
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{
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if (data.Length < 8)
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throw new ArgumentException("Data buffer too small");
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MessageId = data[0];
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MessageLength = FneUtils.ToUInt16(data, 1);
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RespKind = (byte)((data[3] >> 6) & 0x03);
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Complete = (data[3] & 0x01) == 0;
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DstLlId = FneUtils.ToUInt16(data, 4);
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SrcLlId = FneUtils.ToUInt16(data, 6);
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}
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} // public class KmmFrame
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} // namespace fnecore.P25.kmm |