87 lines
2.2 KiB
C#
87 lines
2.2 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Text;
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namespace XWorld.Framework.Protocol
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{
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// 手写小端二进制写入器：varint(LEB128) + zigzag，无反射，AOT/WASM 友好
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public sealed class PacketWriter
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{
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private readonly List<byte> _buf;
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public PacketWriter(int capacity = 64)
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{
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_buf = new List<byte>(capacity);
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}
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public void WriteByte(byte v) => _buf.Add(v);
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public void WriteBool(bool v) => _buf.Add(v ? (byte)1 : (byte)0);
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public void WriteUInt16(ushort v)
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{
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_buf.Add((byte)(v & 0xFF));
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_buf.Add((byte)((v >> 8) & 0xFF));
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}
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public void WriteVarUInt(uint v)
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{
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while (v >= 0x80)
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{
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_buf.Add((byte)(v | 0x80));
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v >>= 7;
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}
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_buf.Add((byte)v);
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}
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public void WriteVarInt(int v)
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{
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uint zig = (uint)((v << 1) ^ (v >> 31)); // zigzag
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WriteVarUInt(zig);
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}
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public void WriteVarLong(long v)
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{
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ulong zig = (ulong)((v << 1) ^ (v >> 63));
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while (zig >= 0x80)
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{
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_buf.Add((byte)(zig | 0x80));
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zig >>= 7;
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}
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_buf.Add((byte)zig);
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}
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public void WriteSingle(float v)
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{
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byte[] b = BitConverter.GetBytes(v);
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if (!BitConverter.IsLittleEndian) Array.Reverse(b);
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_buf.Add(b[0]); _buf.Add(b[1]); _buf.Add(b[2]); _buf.Add(b[3]);
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}
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public void WriteBytes(byte[] data)
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{
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if (data == null || data.Length == 0)
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{
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WriteVarUInt(0);
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return;
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}
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WriteVarUInt((uint)data.Length);
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_buf.AddRange(data);
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}
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public void WriteString(string s)
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{
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if (string.IsNullOrEmpty(s))
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{
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WriteVarUInt(0);
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return;
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}
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byte[] b = Encoding.UTF8.GetBytes(s);
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WriteVarUInt((uint)b.Length);
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_buf.AddRange(b);
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}
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public byte[] ToArray() => _buf.ToArray();
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}
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}
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