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Compress large packets

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This commit is contained in:
Kei-Luna
2026-05-13 19:09:41 +09:00
parent 9e518edb8e
commit 6c5d546026
5 changed files with 23 additions and 9 deletions
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23
TcpSharp/PacketCodec.cs
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@@ -2,6 +2,7 @@
using MikuSB.Enums.Packet;
using MikuSB.Util;
using System.Buffers.Binary;
using System.IO.Compression;
using System.Net.Sockets;
namespace MikuSB.TcpSharp
@@ -63,11 +64,11 @@ namespace MikuSB.TcpSharp
}
}
public byte[] Encode(ushort packetId, byte[] payload, PacketFraming framing = PacketFraming.FourByteLittleEndianLength)
public byte[] Encode(ushort packetId, byte[] payload, PacketFraming framing = PacketFraming.FourByteLittleEndianLength, int uncompressedSize = 0)
{
return framing switch
{
PacketFraming.TwoByteBigEndianLength => EncodeTwoByteFrame(packetId, payload),
PacketFraming.TwoByteBigEndianLength => EncodeTwoByteFrame(packetId, payload, uncompressedSize),
PacketFraming.FourByteLittleEndianLength => EncodeFourByteFrame(packetId, payload),
_ => EncodeFourByteFrame(packetId, payload)
};
@@ -220,8 +221,20 @@ namespace MikuSB.TcpSharp
return payload;
}
private byte[] EncodeTwoByteFrame(ushort packetId, byte[] payload)
private const int CompressionThreshold = 60000;
private static byte[] ZlibCompress(byte[] data)
{
using var ms = new MemoryStream();
using (var zlib = new ZLibStream(ms, CompressionLevel.Optimal, leaveOpen: true))
zlib.Write(data, 0, data.Length);
return ms.ToArray();
}
private byte[] EncodeTwoByteFrame(ushort packetId, byte[] payload, int uncompressedSize = 0)
{
if (payload.Length > CompressionThreshold)
payload = ZlibCompress(payload);
var wrappedPayload = WrapPayload(payload);
var buffer = new byte[HeaderSize4Byte + wrappedPayload.Length];
@@ -246,7 +259,9 @@ namespace MikuSB.TcpSharp
const int wrapperHeaderSize = 35;
var wrapped = new byte[wrapperHeaderSize + payload.Length];
BinaryPrimitives.WriteUInt16LittleEndian(wrapped.AsSpan(6, 2), (ushort)payload.Length);
wrapped[11] = 1;
if (payload.Length >= 2 && payload[0] == 0x78 &&
(payload[1] == 0x01 || payload[1] == 0x5E || payload[1] == 0x9C || payload[1] == 0xDA))
wrapped[10] = 2;
payload.CopyTo(wrapped.AsSpan(wrapperHeaderSize));
return wrapped;