initial commit

2026-08-27 11:22:54 -06:00
commit 3d81b11e14
2281 changed files with 54227 additions and 0 deletions
@@ -0,0 +1,53 @@
+using System;
+
+namespace Crysome.Common.Network;
+
+public static class UdpTransport
+{
+	public const int HeaderSize = 13;
+
+	public const int MaxFragmentSize = 60000;
+
+	public static byte[] BuildFragment(uint sessionToken, byte packetTypeId, uint frameSeq, ushort fragIdx, ushort fragCount, byte[] payloadData, int payloadOffset, int payloadLength)
+	{
+		byte[] array = new byte[13 + payloadLength];
+		int num = 0;
+		Buffer.BlockCopy(BitConverter.GetBytes(sessionToken), 0, array, num, 4);
+		num += 4;
+		array[num++] = packetTypeId;
+		Buffer.BlockCopy(BitConverter.GetBytes(frameSeq), 0, array, num, 4);
+		num += 4;
+		Buffer.BlockCopy(BitConverter.GetBytes(fragIdx), 0, array, num, 2);
+		num += 2;
+		Buffer.BlockCopy(BitConverter.GetBytes(fragCount), 0, array, num, 2);
+		num += 2;
+		Buffer.BlockCopy(payloadData, payloadOffset, array, num, payloadLength);
+		return array;
+	}
+
+	public static bool ParseHeader(byte[] datagram, int length, out uint sessionToken, out byte packetTypeId, out uint frameSeq, out ushort fragIdx, out ushort fragCount, out int payloadOffset, out int payloadLength)
+	{
+		sessionToken = 0u;
+		packetTypeId = 0;
+		frameSeq = 0u;
+		fragIdx = 0;
+		fragCount = 0;
+		payloadOffset = 0;
+		payloadLength = 0;
+		if (length < 13)
+		{
+			return false;
+		}
+		int num = 0;
+		sessionToken = BitConverter.ToUInt32(datagram, num);
+		num += 4;
+		packetTypeId = datagram[num++];
+		frameSeq = BitConverter.ToUInt32(datagram, num);
+		num += 4;
+		fragIdx = BitConverter.ToUInt16(datagram, num);
+		num += 2;
+		fragCount = BitConverter.ToUInt16(datagram, num);
+		payloadLength = length - (payloadOffset = num + 2);
+		return true;
+	}
+}