/*************************************************************************
* ModernUO *
* Copyright (C) 2019-2021 - ModernUO Development Team *
* Email: hi@modernuo.com *
* File: HousePackets.cs *
* *
* This program is free software: you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation, either version 3 of the License, or *
* (at your option) any later version. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program. If not, see . *
*************************************************************************/
using System;
using System.Buffers;
using System.IO;
using System.IO.Compression;
using System.Runtime.CompilerServices;
using Server.Logging;
using Server.Network;
namespace Server.Multis
{
public static class HousePackets
{
private static readonly ILogger logger = LogFactory.GetLogger(typeof(HousePackets));
public static void SendBeginHouseCustomization(this NetState ns, Serial house)
{
if (ns == null)
{
return;
}
var writer = new SpanWriter(stackalloc byte[17]);
writer.Write((byte)0xBF); // Packet Id
writer.Write((ushort)17);
writer.Write((short)0x20); // Sub-packet
writer.Write(house);
writer.Write((byte)0x04); // command
writer.Write((ushort)0x0000);
writer.Write((ushort)0xFFFF);
writer.Write((ushort)0xFFFF);
writer.Write((byte)0xFF);
ns.Send(writer.Span);
}
public static void SendEndHouseCustomization(this NetState ns, Serial house)
{
if (ns == null)
{
return;
}
var writer = new SpanWriter(stackalloc byte[17]);
writer.Write((byte)0xBF); // Packet Id
writer.Write((ushort)17);
writer.Write((short)0x20); // Sub-packet
writer.Write(house);
writer.Write((byte)0x05); // command
writer.Write((ushort)0x0000);
writer.Write((ushort)0xFFFF);
writer.Write((ushort)0xFFFF);
writer.Write((byte)0xFF);
ns.Send(writer.Span);
}
public static void SendDesignStateGeneral(this NetState ns, Serial house, int revision)
{
if (ns == null)
{
return;
}
var writer = new SpanWriter(stackalloc byte[13]);
writer.Write((byte)0xBF); // Packet Id
writer.Write((ushort)13);
writer.Write((short)0x1D); // Sub-packet
writer.Write(house);
writer.Write(revision);
ns.Send(writer.Span);
}
private const int planeCount = 9;
private const int planeLength = 0x400; // ItemID (max 1024 items per plane within the design grid)
private const int stairsCount = 6;
private const int stairsLength = 5; // ItemID, X, Y, Z (max 4500 items)
private const int stairsPerBuffer = 750;
// Maximum size of the packed packet (31988 bytes)
private static readonly int maxPacketLength =
18 +
(Zlib.MaxPackSize(planeLength) + 4) * planeCount + // 9369
(Zlib.MaxPackSize(stairsPerBuffer * stairsLength) + 4) * stairsCount; // 22602
public static byte[] CreateHouseDesignStateDetailed(uint serial, int revision, MultiComponentList components)
{
var xMin = components.Min.X;
var yMin = components.Min.Y;
var xMax = components.Max.X;
var yMax = components.Max.Y;
var tiles = components.List;
const int totalPlaneLength = planeLength * planeCount;
const int stairsBufferLength = stairsPerBuffer * stairsLength;
const int maxUnpackedSize = totalPlaneLength + stairsBufferLength * stairsCount;
using var inflatedWriter = new SpanWriter(maxUnpackedSize);
Span planesUsed = stackalloc bool[9];
var index = 0;
var stairsIndex = totalPlaneLength;
var totalStairsUsed = 0;
var width = xMax - xMin + 1;
var height = yMax - yMin + 1;
for (var i = 0; i < tiles.Length; ++i)
{
var mte = tiles[i];
var x = mte.OffsetX - xMin;
var y = mte.OffsetY - yMin;
int z = mte.OffsetZ;
var floor = TileData.ItemTable[mte.ItemId & TileData.MaxItemValue].Height <= 0;
int plane = z switch
{
0 => 0,
7 => 1,
27 => 2,
47 => 3,
67 => 4,
_ => -1
};
if (plane > -1)
{
int size;
if (plane == 0)
{
size = height;
}
else if (floor)
{
size = height - 2;
x -= 1;
y -= 1;
}
else
{
size = height - 1;
plane += 4;
}
index = (x * size + y) * 2;
if (x >= 0 && y >= 0 && y < size && index + 1 < 0x400)
{
var planeUsed = planesUsed[plane];
if (!planeUsed)
{
inflatedWriter.Seek(plane * planeLength, SeekOrigin.Begin);
inflatedWriter.Clear(planeLength);
planesUsed[plane] = true;
}
inflatedWriter.Seek(index, SeekOrigin.Begin);
inflatedWriter.Write(mte.ItemId);
continue;
}
}
inflatedWriter.Seek(stairsIndex, SeekOrigin.Begin);
inflatedWriter.Write(mte.ItemId);
inflatedWriter.Write((byte)mte.OffsetX);
inflatedWriter.Write((byte)mte.OffsetY);
inflatedWriter.Write((byte)mte.OffsetZ);
stairsIndex = inflatedWriter.Position;
totalStairsUsed++;
}
var buffer = GC.AllocateUninitializedArray(maxPacketLength);
var writer = new SpanWriter(buffer);
writer.Write((byte)0xD8); // Packet ID
writer.Seek(2, SeekOrigin.Current); // Length
writer.Write((byte)0x03); // Compression Type
writer.Write((byte)0x00); // Unknown
writer.Write(serial);
writer.Write(revision);
writer.Write((short)tiles.Length);
writer.Seek(3, SeekOrigin.Current); // Buffer Length, Plane Count
var totalPlanes = 0;
var totalLength = 1; // includes plane count
for (var i = 0; i < planeCount; i++)
{
if (!planesUsed[i])
{
inflatedWriter.Seek(planeCount, SeekOrigin.Current);
continue;
}
int size = i switch
{
0 => width * height * 2,
< 5 => (width - 1) * (height - 2) * 2,
_ => width * (height - 1) * 2
};
var source = inflatedWriter.RawBuffer.Slice(i * planeLength, size);
writer.Write((byte)(0x20 | i));
WritePacked(source, ref writer, out int destLength);
totalLength += 4 + destLength;
totalPlanes++;
}
index = 0;
while (totalStairsUsed > 0)
{
var count = Math.Min(stairsPerBuffer, totalStairsUsed);
totalStairsUsed -= count;
var start = totalPlaneLength + index * stairsLength;
var size = count * 5;
var source = inflatedWriter.RawBuffer.Slice(start, size);
writer.Write((byte)(9 + index++));
WritePacked(source, ref writer, out int destLength);
totalLength += 4 + destLength;
totalPlanes++;
}
writer.Seek(15, SeekOrigin.Begin);
writer.Write((short)totalLength);
writer.Write((byte)totalPlanes);
writer.WritePacketLength();
// TODO: Avoid this somehow.
Array.Resize(ref buffer, writer.BytesWritten);
return buffer;
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private static void WritePacked(ReadOnlySpan source, ref SpanWriter writer, out int length)
{
var size = source.Length;
var dest = writer.RawBuffer[(writer.Position + 3)..];
length = dest.Length;
var ce = Zlib.Pack(dest, ref length, source, ZlibQuality.Default);
if (ce != ZlibError.Okay)
{
logger.Warning("ZLib error: {0} (#{1})", ce, (int)ce);
length = 0;
size = 0;
}
writer.Write((byte)size);
writer.Write((byte)length);
writer.Write((byte)(((size >> 4) & 0xF0) | ((length >> 8) & 0xF)));
writer.Seek(length, SeekOrigin.Current);
}
}
}