10a69bf754
## Breaking Changes
Incoming packet registration signature has changed to:
```cs
delegate* void OnReceiveCallback(NetState state, SpanReader reader, int packetLength);
IncomingPackets.Register(int packetID, int length, bool ingame, OnReceiveCallback onReceive);
```
For example, an incoming packet handler signature would now look like this:
```cs
public static void SomeIncomingPacket(NetState state, SpanReader reader, int packetLength)
{
// Parse the data
}
```
## Summary
Updates the network Pipe class to use a mirrored memory technique. This technique involves mapping the same physical memory to two contiguous virtual memory spaces so the byte buffer appears duplicated. This allows writing to a double-sized array to wrap around without the need for the `CircularBuffer` classes.
In practice this allows us to use `Span<byte>` as if the buffer was a regular array.
### Bug Fixes
- [X] Fixes bad fixed length string parsing
294 lines
10 KiB
C#
294 lines
10 KiB
C#
/*************************************************************************
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* ModernUO *
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* Copyright 2019-2023 - ModernUO Development Team *
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* Email: hi@modernuo.com *
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* File: BulletinBoardPackets.cs *
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* *
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* This program is free software: you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation, either version 3 of the License, or *
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* (at your option) any later version. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program. If not, see <http://www.gnu.org/licenses/>. *
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*************************************************************************/
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using System;
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using System.Buffers;
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using System.IO;
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using System.Runtime.CompilerServices;
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using Server.Items;
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using Server.Text;
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namespace Server.Network
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{
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public static class BulletinBoardPackets
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{
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public static unsafe void Configure()
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{
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IncomingPackets.Register(0x71, 0, true, &BBClientRequest);
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}
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public static string FormatTS(TimeSpan ts)
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{
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var totalSeconds = (int)ts.TotalSeconds;
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var seconds = totalSeconds % 60;
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var minutes = totalSeconds / 60;
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if (minutes != 0 && seconds != 0)
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{
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return $"{minutes} minute{(minutes == 1 ? "" : "s")} and {seconds} second{(seconds == 1 ? "" : "s")}";
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}
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if (minutes != 0)
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{
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return $"{minutes} minute{(minutes == 1 ? "" : "s")}";
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}
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return $"{seconds} second{(seconds == 1 ? "" : "s")}";
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}
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public static void BBClientRequest(NetState state, SpanReader reader, int packetLength)
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{
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var from = state.Mobile;
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int packetID = reader.ReadByte();
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if (World.FindItem((Serial)reader.ReadUInt32()) is not BaseBulletinBoard board || !board.CheckRange(from))
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{
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return;
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}
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switch (packetID)
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{
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case 3:
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BBRequestContent(from, board, reader);
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break;
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case 4:
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BBRequestHeader(from, board, reader);
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break;
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case 5:
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BBPostMessage(from, board, reader);
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break;
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case 6:
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BBRemoveMessage(from, board, reader);
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break;
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}
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}
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public static void BBRequestContent(Mobile from, BaseBulletinBoard board, SpanReader reader)
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{
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if (World.FindItem((Serial)reader.ReadUInt32()) is not BulletinMessage msg || msg.Parent != board)
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{
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return;
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}
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from.NetState.SendBBMessage(board, msg, true);
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}
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public static void BBRequestHeader(Mobile from, BaseBulletinBoard board, SpanReader reader)
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{
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if (World.FindItem((Serial)reader.ReadUInt32()) is not BulletinMessage msg || msg.Parent != board)
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{
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return;
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}
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from.NetState.SendBBMessage(board, msg);
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}
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public static void BBPostMessage(Mobile from, BaseBulletinBoard board, SpanReader reader)
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{
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var thread = World.FindItem((Serial)reader.ReadUInt32()) as BulletinMessage;
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if (thread != null && thread.Parent != board)
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{
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thread = null;
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}
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var breakout = 0;
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while (thread?.Thread != null && breakout++ < 10)
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{
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thread = thread.Thread;
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}
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if (board.GetLastPostTime(from, thread == null, out var lastPostTime))
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{
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if (thread == null)
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{
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if (!BulletinBoardSystem.CheckCreateTime(lastPostTime))
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{
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from.SendMessage($"You must wait {FormatTS(BulletinBoardSystem.ThreadCreateTime)} before creating a new thread.");
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return;
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}
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}
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else if (!BulletinBoardSystem.CheckReplyTime(lastPostTime))
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{
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from.SendMessage($"You must wait {FormatTS(BulletinBoardSystem.ThreadReplyTime)} before replying to another thread.");
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return;
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}
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}
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var subject = reader.ReadUTF8Safe(reader.ReadByte());
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if (subject.Length == 0)
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{
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return;
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}
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var lines = new string[reader.ReadByte()];
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if (lines.Length == 0)
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{
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return;
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}
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for (var i = 0; i < lines.Length; ++i)
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{
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lines[i] = reader.ReadUTF8Safe(reader.ReadByte());
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}
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board.PostMessage(from, thread, subject, lines);
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}
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public static void BBRemoveMessage(Mobile from, BaseBulletinBoard board, SpanReader reader)
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{
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if (World.FindItem((Serial)reader.ReadUInt32()) is not BulletinMessage msg || msg.Parent != board)
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{
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return;
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}
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if (from.AccessLevel < AccessLevel.GameMaster && msg.Poster != from)
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{
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return;
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}
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msg.Delete();
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}
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public static void SendBBDisplayBoard(this NetState ns, BaseBulletinBoard board)
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{
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if (ns.CannotSendPackets())
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{
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return;
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}
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var writer = new SpanWriter(stackalloc byte[38]);
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writer.Write((byte)0x71); // Packet ID
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writer.Write((ushort)38);
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writer.Write((byte)0x00); // Command
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writer.Write(board.Serial);
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var text = board.BoardName ?? "";
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var textChars = text.AsSpan(0, Math.Min(text.Length, 30));
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Span<byte> textBuffer = stackalloc byte[TextEncoding.UTF8.GetMaxByteCount(textChars.Length)]; // Max 30 * 3 (90 bytes)
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// We are ok with the string being cut-off mid character. The alternative is very slow.
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var byteLength = Math.Min(29, TextEncoding.UTF8.GetBytes(textChars, textBuffer));
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writer.Write(textBuffer[..byteLength]);
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writer.Clear(30 - byteLength); // terminator
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ns.Send(writer.Span);
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private static void UpdateLengthCounters(this string text, ref int maxLength, ref int longestTextLine, bool pad = false)
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{
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var line = Math.Min(255, text.Length);
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var byteCount = TextEncoding.UTF8.GetMaxByteCount(line) + (pad ? 3 : 2); // 1 + length + terminator
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maxLength += byteCount;
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longestTextLine = Math.Max(byteCount, longestTextLine);
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}
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public static void SendBBMessage(this NetState ns, BaseBulletinBoard board, BulletinMessage msg, bool content = false)
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{
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if (ns.CannotSendPackets())
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{
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return;
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}
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var longestTextLine = 0;
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var maxLength = 22;
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var poster = msg.PostedName ?? "";
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poster.UpdateLengthCounters(ref maxLength, ref longestTextLine);
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var subject = msg.Subject ?? "";
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subject.UpdateLengthCounters(ref maxLength, ref longestTextLine);
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var time = msg.GetTimeAsString() ?? "";
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time.UpdateLengthCounters(ref maxLength, ref longestTextLine);
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var equipLength = Math.Min(255, msg.PostedEquip.Length);
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var linesLength = Math.Min(255, msg.Lines.Length);
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if (content)
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{
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maxLength += 2 + equipLength * 4; // We have an extra 4 from the thread serial
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for (int i = 0; i < linesLength; i++)
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{
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msg.Lines[i].UpdateLengthCounters(ref maxLength, ref longestTextLine, true);
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}
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}
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Span<byte> textBuffer = stackalloc byte[TextEncoding.UTF8.GetMaxByteCount(longestTextLine)];
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var writer = maxLength > 81920 ? new SpanWriter(maxLength) : new SpanWriter(stackalloc byte[maxLength]);
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writer.Write((byte)0x71); // Packet ID
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writer.Seek(2, SeekOrigin.Current);
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writer.Write((byte)(content ? 0x02 : 0x01)); // Command
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writer.Write(board.Serial);
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writer.Write(msg.Serial);
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if (!content)
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{
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writer.Write(msg.Thread?.Serial ?? Serial.Zero);
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}
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writer.WriteString(poster, textBuffer);
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writer.WriteString(subject, textBuffer);
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writer.WriteString(time, textBuffer);
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if (content)
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{
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writer.Write((short)msg.PostedBody);
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writer.Write((short)msg.PostedHue);
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writer.Write((byte)equipLength);
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for (var i = 0; i < equipLength; i++)
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{
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var eq = msg.PostedEquip[i];
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writer.Write((short)eq._itemID);
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writer.Write((short)eq._hue);
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}
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writer.Write((byte)linesLength);
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for (var i = 0; i < linesLength; i++)
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{
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writer.WriteString(msg.Lines[i], textBuffer, true);
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}
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}
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writer.WritePacketLength();
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ns.Send(writer.Span);
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writer.Dispose();
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}
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private static void WriteString(this ref SpanWriter writer, string text, Span<byte> buffer, bool pad = false)
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{
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var tail = pad ? 2 : 1;
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var length = Math.Min(pad ? 253 : 254, text.GetBytesUtf8(buffer));
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writer.Write((byte)(length + tail));
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writer.Write(buffer[..length]);
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if (pad)
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{
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writer.Write((ushort)0); // Compensating for an old client bug
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}
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else
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{
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writer.Write((byte)0); // Terminator
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}
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}
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}
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}
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