67 lines
2.2 KiB
C#
67 lines
2.2 KiB
C#
using System.Buffers.Binary;
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using FurinaImpact.Protocol;
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using Google.Protobuf;
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namespace FurinaImpact.Gameserver.Network;
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internal class NetPacket
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{
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private const ushort HeadMagic = 0x4567;
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private const ushort TailMagic = 0x89AB;
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public CmdType CmdType { get; set; }
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public Memory<byte> Head { get; set; }
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public Memory<byte> Body { get; set; }
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public TBody DecodeBody<TBody>() where TBody : IMessage<TBody>, new()
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{
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return new MessageParser<TBody>(() => new()).ParseFrom(Body.Span);
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}
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public int EncodeTo(Memory<byte> buffer)
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{
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Span<byte> span = buffer.Span;
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BinaryPrimitives.WriteUInt16BigEndian(span[0..2], HeadMagic);
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BinaryPrimitives.WriteUInt16BigEndian(span[2..4], (ushort)CmdType);
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BinaryPrimitives.WriteUInt16BigEndian(span[4..6], (ushort)Head.Length);
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BinaryPrimitives.WriteInt32BigEndian(span[6..10], Body.Length);
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Head.CopyTo(buffer[10..]);
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Body.CopyTo(buffer[(10 + Head.Length)..]);
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BinaryPrimitives.WriteUInt16BigEndian(span[(10 + Head.Length + Body.Length)..], TailMagic);
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return 12 + Head.Length + Body.Length;
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}
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public static (NetPacket?, int) DecodeFrom(Memory<byte> data)
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{
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ReadOnlySpan<byte> span = data.Span;
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ushort headMagic = BinaryPrimitives.ReadUInt16BigEndian(span[0..2]);
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if (headMagic != HeadMagic)
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return (null, 0);
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ushort cmdType = BinaryPrimitives.ReadUInt16BigEndian(span[2..4]);
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int headLength = BinaryPrimitives.ReadUInt16BigEndian(span[4..6]);
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int bodyLength = BinaryPrimitives.ReadInt32BigEndian(span[6..10]);
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if (data.Length < 12 + headLength + bodyLength)
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return (null, 0);
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Memory<byte> head = data.Slice(10, headLength);
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Memory<byte> body = data.Slice(10 + headLength, bodyLength);
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ushort tailMagic = BinaryPrimitives.ReadUInt16BigEndian(span[(10 + headLength + bodyLength)..]);
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if (tailMagic != TailMagic)
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return (null, 0);
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NetPacket netPacket = new()
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{
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CmdType = (CmdType)cmdType,
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Head = head,
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Body = body
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};
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return (netPacket, 12 + headLength + bodyLength);
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}
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}
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