public static void WritePacketLength(this CircularBufferWriter writer)
{
var length = writer.Position;
writer.Seek(1, SeekOrigin.Begin);
writer.Write((ushort)length);
writer.Seek(length, SeekOrigin.Begin);
}
public static void SendContainerContent(this NetState ns, Mobile beholder, Item beheld)
{
if (ns == null || !ns.GetSendBuffer(out var buffer))
{
return;
}
var items = beheld.Items;
var count = items.Count;
var writer = new CircularBufferWriter(buffer);
writer.Write((byte)0x3C); // Packet ID
writer.Seek(4, SeekOrigin.Current); // Length & writter count
var written = 0;
for (var i = 0; i < count; ++i)
{
var child = items[i];
if (!child.Deleted && beholder.CanSee(child))
{
var loc = child.Location;
writer.Write(child.Serial);
writer.Write((ushort)child.ItemID);
writer.Write((byte)0); // signed, itemID offset
writer.Write((ushort)Math.Min(child.Amount, ushort.MaxValue));
writer.Write((short)loc.X);
writer.Write((short)loc.Y);
if (ns.ContainerGridLines)
{
writer.Write((byte)0); // Grid Location?
}
writer.Write(beheld.Serial);
writer.Write((ushort)(child.QuestItem ? Item.QuestItemHue : child.Hue));
++written;
}
}
var length = writer.Position;
writer.Seek(1, SeekOrigin.Begin);
writer.Write((ushort)length);
writer.Write((ushort)written);
ns.Send(ref buffer, length);
}
/**
* Packet: 0xA8
* Length: up to 240 bytes
*
* Sends login acknowledge with server listing
*/
public static void SendAccountLoginAck(this NetState ns)
{
if (ns == null || !ns.GetSendBuffer(out var buffer))
{
return;
}
var writer = new CircularBufferWriter(buffer);
writer.Write((byte)0xA8); // Packet ID
writer.Seek(2, SeekOrigin.Current); // Length
writer.Write((byte)0x5D);
var info = ns.ServerInfo;
writer.Write((ushort)info.Length);
for (var i = 0; i < info.Length; ++i)
{
var si = info[i];
writer.Write((ushort)i);
writer.WriteAscii(si.Name, 32);
writer.Write((byte)si.FullPercent);
writer.Write((sbyte)si.TimeZone);
writer.Write(Utility.GetAddressValue(si.Address.Address));
}
writer.WritePacketLength();
ns.Send(ref buffer, writer.Position);
}
public static void SendVendorBuyList(this NetState ns, Mobile vendor, List <BuyItemState> list)
{
if (ns == null || !ns.GetSendBuffer(out var buffer))
{
return;
}
var writer = new CircularBufferWriter(buffer);
writer.Write((byte)0x74); // Packet ID
writer.Seek(2, SeekOrigin.Current);
writer.Write((vendor.FindItemOnLayer(Layer.ShopBuy) as Container)?.Serial ?? Serial.MinusOne);
writer.Write((byte)list.Count);
for (var i = 0; i < list.Count; ++i)
{
var bis = list[i];
writer.Write(bis.Price);
var desc = bis.Description ?? "";
writer.Write((byte)desc.Length);
writer.WriteAscii(desc); // Doesn't look like it is used anymore
}
writer.WritePacketLength();
ns.Send(ref buffer, writer.Position);
}
public static void SendVendorBuyContent(this NetState ns, List <BuyItemState> list)
{
if (ns == null || !ns.GetSendBuffer(out var buffer))
{
return;
}
var writer = new CircularBufferWriter(buffer);
writer.Write((byte)0x3C); // Packet ID
writer.Seek(2, SeekOrigin.Current);
writer.Write((short)list.Count);
for (var i = list.Count - 1; i >= 0; --i)
{
var bis = list[i];
writer.Write(bis.MySerial);
writer.Write((ushort)bis.ItemID);
writer.Write((byte)0); // itemID offset
writer.Write((ushort)bis.Amount);
writer.Write((short)(i + 1)); // x
writer.Write((short)1); // y
if (ns.ContainerGridLines)
{
writer.Write((byte)0); // Grid Location?
}
writer.Write(bis.ContainerSerial);
writer.Write((ushort)bis.Hue);
}
writer.WritePacketLength();
ns.Send(ref buffer, writer.Position);
}
public static void SendDisplayItemListMenu(this NetState ns, ItemListMenu menu)
{
if (ns == null || menu == null || !ns.GetSendBuffer(out var buffer))
{
return;
}
var writer = new CircularBufferWriter(buffer);
writer.Write((byte)0x7C); // Packet ID
writer.Seek(2, SeekOrigin.Current); // Length
writer.Write(menu.Serial);
writer.Write((ushort)0);
var question = menu.Question?.Trim();
if (question == null)
{
writer.Write((byte)0);
}
else
{
var questionLength = question.Length;
writer.Write((byte)questionLength);
writer.WriteAscii(question);
}
var entries = menu.Entries;
int entriesLength = (byte)entries.Length;
writer.Write((byte)entriesLength);
for (var i = 0; i < entriesLength; ++i)
{
var e = entries[i];
writer.Write((ushort)e.ItemID);
writer.Write((short)e.Hue);
var name = e.Name?.Trim();
if (name == null)
{
writer.Write((byte)0);
}
else
{
var nameLength = name.Length;
writer.Write((byte)nameLength);
writer.WriteAscii(name);
}
}
writer.WritePacketLength();
ns.Send(ref buffer, writer.Position);
}
public static void SendOldSpellbookContent(this NetState ns, Serial book, int offset, ulong content)
{
if (ns == null || !ns.GetSendBuffer(out var buffer))
{
return;
}
var writer = new CircularBufferWriter(buffer);
writer.Write((byte)0x3C); // Packet ID
writer.Seek(4, SeekOrigin.Current); // Length & written count
var written = 0;
ulong mask = 1;
for (var i = 0; i < 64; ++i, mask <<= 1)
{
if ((content & mask) != 0)
{
writer.Write(0x7FFFFFFF - i);
writer.Write((ushort)0); // child ItemID
writer.Write((byte)0); // ItemID offset
writer.Write((ushort)(i + offset)); // Amount
writer.Write(0); // X, Y
if (ns.ContainerGridLines)
{
writer.Write((byte)0); // Grid Location
}
writer.Write(book);
writer.Write((short)0); // Quest Hue
++written;
}
}
var length = writer.Position;
writer.Seek(1, SeekOrigin.Begin);
writer.Write((ushort)length);
writer.Write((ushort)written);
ns.Send(ref buffer, length);
}
public static void SendDisplayQuestionMenu(this NetState ns, QuestionMenu menu)
{
if (ns == null || menu == null || !ns.GetSendBuffer(out var buffer))
{
return;
}
var writer = new CircularBufferWriter(buffer);
writer.Write((byte)0x7C); // Packet ID
writer.Seek(2, SeekOrigin.Current); // Length
writer.Write(menu.Serial);
writer.Write((ushort)0);
var question = menu.Question?.Trim();
if (question == null)
{
writer.Write((byte)0);
}
else
{
var questionLength = question.Length;
writer.Write((byte)questionLength);
writer.WriteAscii(question);
}
var answers = menu.Answers;
int answersLength = (byte)answers.Length;
writer.Write((byte)answersLength);
for (var i = 0; i < answersLength; ++i)
{
writer.Write(0);
var answer = answers[i]?.Trim();
if (answer == null)
{
writer.Write((byte)0);
}
else
{
var nameLength = answer.Length;
writer.Write((byte)nameLength);
writer.WriteAscii(answer);
}
}
writer.WritePacketLength();
ns.Send(ref buffer, writer.Position);
}
/**
* Packet: 0x81
* Length: Up to 425 bytes
*
* Displays the list of characters during the login process.
* Note: Currently Unused
*/
public static void SendChangeCharacter(this NetState ns, IAccount a)
{
if (ns == null || a == null || !ns.GetSendBuffer(out var buffer))
{
return;
}
var length = 5 + a.Length * 60;
var writer = new CircularBufferWriter(buffer);
writer.Write((byte)0x81); // Packet ID
writer.Write((ushort)length);
writer.Write((ushort)0); // Count & Placeholder
int count = 0;
for (var i = 0; i < a.Length; ++i)
{
var m = a[i];
if (m == null)
{
writer.Clear(60);
}
else
{
var name = (m.RawName?.Trim()).DefaultIfNullOrEmpty("-no name-");
count++;
writer.WriteAscii(name, 30);
writer.Clear(30); // Password (empty)
}
}
var position = writer.Position;
writer.Seek(3, SeekOrigin.Begin);
writer.Write((byte)count);
writer.Seek(position, SeekOrigin.Begin);
ns.Send(ref buffer, writer.Position);
}
/**
* Packet: 0x86
* Length: Up to 424 bytes
*
* Sends updated character list
*/
public static void SendCharacterListUpdate(this NetState ns, IAccount a)
{
if (ns == null || a == null || !ns.GetSendBuffer(out var buffer))
{
return;
}
var writer = new CircularBufferWriter(buffer);
writer.Write((byte)0x86); // Packet ID
writer.Seek(2, SeekOrigin.Current); // Length
var highSlot = -1;
for (var i = a.Length - 1; i >= 0; i--)
{
if (a[i] != null)
{
highSlot = i;
break;
}
}
var count = Math.Max(Math.Max(highSlot + 1, a.Limit), 5);
writer.Write((byte)count);
for (int i = 0; i < count; i++)
{
var m = a[i];
if (m == null)
{
writer.Clear(60);
}
else
{
var name = (m.RawName?.Trim()).DefaultIfNullOrEmpty("-no name-");
writer.WriteAscii(name, 30);
writer.Clear(30); // password
}
}
writer.WritePacketLength();
ns.Send(ref buffer, writer.Position);
}
// First only, beginning
// Second only
// Split
// First only, beginning, fixed length smaller
// Second only, fixed length smaller
// Split, fixed length smaller
// First only, beginning, fixed length bigger
// Second only, fixed length bigger
// Split, fixed length bigger
public void TestWriteString(
string value,
string encodingStr,
int fixedLength,
int firstSize,
int secondSize,
int offset
)
{
Span <byte> buffer = stackalloc byte[firstSize + secondSize];
buffer.Clear();
var encoding = EncodingHelpers.GetEncoding(encodingStr);
var strLength = fixedLength > -1 ? Math.Min(value.Length, fixedLength) : value.Length;
var chars = value.AsSpan(0, strLength);
var writer = new CircularBufferWriter(buffer.Slice(0, firstSize), buffer.Slice(firstSize));
writer.Seek(offset, SeekOrigin.Begin);
writer.WriteString(chars, encoding);
if (offset > 0)
{
Span <byte> testEmpty = stackalloc byte[offset];
testEmpty.Clear();
AssertThat.Equal(buffer.Slice(0, offset), testEmpty);
}
Span <byte> expectedStr = stackalloc byte[encoding.GetByteCount(chars)];
encoding.GetBytes(chars, expectedStr.Slice(0));
AssertThat.Equal(buffer.Slice(offset, expectedStr.Length), expectedStr);
offset += expectedStr.Length;
if (offset < buffer.Length)
{
Span <byte> testEmpty = stackalloc byte[buffer.Length - offset];
testEmpty.Clear();
AssertThat.Equal(buffer.Slice(offset), testEmpty);
}
}
/**
* Packet: 0xA9
* Length: 1410 or more bytes
*
* Sends list of characters and starting cities.
*/
public static void SendCharacterList(this NetState ns)
{
var acct = ns?.Account;
if (acct == null || !ns.GetSendBuffer(out var buffer))
{
return;
}
var client70130 = ns.NewCharacterList;
var textLength = client70130 ? 32 : 31;
var cityInfo = ns.CityInfo;
var writer = new CircularBufferWriter(buffer);
writer.Write((byte)0xA9); // Packet ID
writer.Seek(2, SeekOrigin.Current); // Length
var highSlot = -1;
for (var i = acct.Length - 1; i >= 0; i--)
{
if (acct[i] != null)
{
highSlot = i;
break;
}
}
var count = Math.Max(Math.Max(highSlot + 1, acct.Limit), 5);
writer.Write((byte)count);
for (int i = 0; i < count; i++)
{
var m = acct[i];
if (m == null)
{
writer.Clear(60);
}
else
{
var name = (m.RawName?.Trim()).DefaultIfNullOrEmpty("-no name-");
writer.WriteAscii(name, 30);
writer.Clear(30); // password
}
}
writer.Write((byte)cityInfo.Length);
for (int i = 0; i < cityInfo.Length; ++i)
{
var ci = cityInfo[i];
writer.Write((byte)i);
writer.WriteAscii(ci.City, textLength);
writer.WriteAscii(ci.Building, textLength);
if (client70130)
{
writer.Write(ci.X);
writer.Write(ci.Y);
writer.Write(ci.Z);
writer.Write(ci.Map?.MapID ?? 0);
writer.Write(ci.Description);
writer.Write(0);
}
}
var flags = ExpansionInfo.CoreExpansion.CharacterListFlags;
if (count > 6)
{
flags |= CharacterListFlags.SeventhCharacterSlot |
CharacterListFlags.SixthCharacterSlot; // 7th Character Slot - TODO: Is SixthCharacterSlot Required?
}
else if (count == 6)
{
flags |= CharacterListFlags.SixthCharacterSlot; // 6th Character Slot
}
else if (acct.Limit == 1)
{
flags |= CharacterListFlags.SlotLimit &
CharacterListFlags.OneCharacterSlot; // Limit Characters & One Character
}
writer.Write((int)flags);
if (client70130)
{
writer.Write((short)-1);
}
writer.WritePacketLength();
ns.Send(ref buffer, writer.Position);
}
public static void SendDisplayContextMenu(this NetState ns, ContextMenu menu)
{
if (ns == null || menu == null || !ns.GetSendBuffer(out var buffer))
{
return;
}
var newCommand = ns.NewHaven && menu.RequiresNewPacket;
var entries = menu.Entries;
var entriesLength = (byte)entries.Length;
var writer = new CircularBufferWriter(buffer);
writer.Write((byte)0xBF); // Packet ID
writer.Seek(2, SeekOrigin.Current); // Length
writer.Write((short)0x14); // Subpacket
writer.Write((short)(newCommand ? 0x02 : 0x01)); // Command
var target = menu.Target;
writer.Write(target.Serial);
writer.Write(entriesLength);
var p = target switch
{
Mobile _ => target.Location,
Item item => item.GetWorldLocation(),
_ => Point3D.Zero
};
for (var i = 0; i < entriesLength; ++i)
{
var e = entries[i];
var range = e.Range;
if (range == -1)
{
range = Core.GlobalUpdateRange;
}
var flags = e.Flags;
if (!(e.Enabled && menu.From.InRange(p, range)))
{
flags |= CMEFlags.Disabled;
}
if (newCommand)
{
writer.Write(e.Number);
writer.Write((short)i);
writer.Write((short)flags);
}
else
{
writer.Write((short)i);
writer.Write((ushort)(e.Number - 3000000));
var color = e.Color & 0xFFFF;
if (color != 0xFFFF)
{
flags |= CMEFlags.Colored;
}
writer.Write((short)flags);
if ((flags & CMEFlags.Colored) != 0)
{
writer.Write((short)color);
}
}
}
writer.WritePacketLength();
ns.Send(ref buffer, writer.Position);
}
}