71 lines
2.0 KiB
C#
71 lines
2.0 KiB
C#
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using System;
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using MECF.Framework.Common.Communications.Tcp.Socket.Framing.Base;
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namespace MECF.Framework.Common.Communications.Tcp.Socket.Framing
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{
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public sealed class LengthFieldBasedFrameEncoder : IFrameEncoder
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{
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public LengthField LengthField { get; private set; }
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public LengthFieldBasedFrameEncoder(LengthField lengthField)
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{
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LengthField = lengthField;
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}
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public void EncodeFrame(byte[] payload, int offset, int count, out byte[] frameBuffer, out int frameBufferOffset, out int frameBufferLength)
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{
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byte[] array = null;
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switch (LengthField)
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{
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case LengthField.OneByte:
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if (count > 255)
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{
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throw new ArgumentOutOfRangeException("count");
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}
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array = new byte[1 + count];
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array[0] = (byte)count;
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Array.Copy(payload, offset, array, 1, count);
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break;
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case LengthField.TwoBytes:
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if (count > 32767)
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{
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throw new ArgumentOutOfRangeException("count");
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}
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array = new byte[2 + count];
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array[0] = (byte)((ushort)count >> 8);
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array[1] = (byte)count;
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Array.Copy(payload, offset, array, 2, count);
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break;
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case LengthField.FourBytes:
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array = new byte[4 + count];
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array[0] = (byte)((uint)count >> 24);
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array[1] = (byte)((uint)count >> 16);
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array[2] = (byte)((uint)count >> 8);
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array[3] = (byte)count;
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Array.Copy(payload, offset, array, 4, count);
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break;
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case LengthField.EigthBytes:
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{
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array = new byte[8 + count];
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ulong num = (ulong)count;
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array[0] = (byte)(num >> 56);
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array[1] = (byte)(num >> 48);
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array[2] = (byte)(num >> 40);
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array[3] = (byte)(num >> 32);
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array[4] = (byte)(num >> 24);
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array[5] = (byte)(num >> 16);
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array[6] = (byte)(num >> 8);
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array[7] = (byte)num;
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Array.Copy(payload, offset, array, 8, count);
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break;
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}
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default:
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throw new NotSupportedException("Specified length field is not supported.");
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}
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frameBuffer = array;
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frameBufferOffset = 0;
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frameBufferLength = array.Length;
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}
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}
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}
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