public static void ChangeDemoDir(SourceDemo demo, Stream s, string newDir)
{
void Write(byte[] buf) => s.Write(buf, 0, buf.Length);
string old = demo.Header.GameDirectory;
if (old == newDir)
{
// no difference
Write(demo.Reader.Data);
return;
}
int lenDiff = newDir.Length - old.Length;
BitStreamReader bsr = demo.Reader;
byte[] dirBytes = Encoding.ASCII.GetBytes(newDir);
Write(bsr.ReadBytes(796));
Write(dirBytes); // header doesn't matter but I change it anyway
Write(new byte[260 - newDir.Length]);
bsr.SkipBytes(260);
Write(bsr.ReadBytes(12));
byte[] tmp = BitConverter.GetBytes((uint)(bsr.ReadUInt() + lenDiff));
if (!BitConverter.IsLittleEndian)
{
tmp = tmp.Reverse().ToArray();
}
Write(tmp);
foreach (SignOn signOn in demo.FilterForPacket <SignOn>().Where(signOn => signOn.FilterForMessage <SvcServerInfo>().Any()))
{
// catch up to signOn packet
int byteCount = (signOn.Reader.AbsoluteBitIndex - bsr.AbsoluteBitIndex) / 8;
Write(bsr.ReadBytes(byteCount));
bsr.SkipBits(signOn.Reader.BitLength);
BitStreamWriter bsw = new BitStreamWriter();
BitStreamReader signOnReader = signOn.Reader;
bsw.WriteBits(signOnReader.ReadRemainingBits());
signOnReader = signOnReader.FromBeginning();
int bytesToMessageStreamSize = demo.DemoInfo.MaxSplitscreenPlayers * 76 + 8;
signOnReader.SkipBytes(bytesToMessageStreamSize);
// edit the message stream length - read uint, and edit at index before the reading of said uint
bsw.EditIntAtIndex((int)(signOnReader.ReadUInt() + lenDiff), signOnReader.CurrentBitIndex - 32, 32);
// actually change the game dir
SvcServerInfo serverInfo = signOn.FilterForMessage <SvcServerInfo>().Single();
int editIndex = serverInfo.GameDirBitIndex - signOn.Reader.AbsoluteBitIndex;
bsw.RemoveBitsAtIndex(editIndex, old.Length * 8);
bsw.InsertBitsAtIndex(dirBytes, editIndex, newDir.Length * 8);
Write(bsw.AsArray);
}
Write(bsr.ReadRemainingBits().bytes);
}
// src_main/common/netmessages.cpp SVC_ServerInfo::WriteToBuffer
protected override void Parse(ref BitStreamReader bsr)
{
NetworkProtocol = bsr.ReadUShort();
ServerCount = bsr.ReadUInt();
IsHltv = bsr.ReadBool();
IsDedicated = bsr.ReadBool();
if (DemoInfo.IsLeft4Dead() && DemoInfo.Game >= SourceGame.L4D2_2147)
{
UnknownBit = bsr.ReadBool();
}
ClientCrc = bsr.ReadSInt();
if (DemoInfo.NewDemoProtocol) // unknown field, could be before ClientCrc
{
Unknown = bsr.ReadUInt();
}
MaxServerClasses = bsr.ReadUShort();
if (NetworkProtocol == 24)
{
MapMD5 = bsr.ReadBytes(16);
}
else
{
MapCrc = bsr.ReadUInt(); // network protocol < 18 according to p2 leak, but doesn't add up for l4d2 and p2
}
PlayerCount = bsr.ReadByte();
MaxClients = bsr.ReadByte();
TickInterval = bsr.ReadFloat();
Platform = (char)bsr.ReadByte();
GameDirBitIndex = bsr.AbsoluteBitIndex;
GameDir = bsr.ReadNullTerminatedString();
MapName = bsr.ReadNullTerminatedString();
SkyName = bsr.ReadNullTerminatedString();
HostName = bsr.ReadNullTerminatedString();
if (DemoInfo.IsLeft4Dead() && DemoInfo.Game >= SourceGame.L4D2_2147)
{
MissionName = bsr.ReadNullTerminatedString();
MutationName = bsr.ReadNullTerminatedString();
}
if (NetworkProtocol == 24)
{
HasReplay = bsr.ReadBool(); // protocol version >= 16
}
// there's a good change that the first SvcServerInfo parsed is parsed correctly
// prevent the interval from being overwritten by subsequent, incorrectly detected, SvcServerInfo messages
// TODO: check if changing tickrate mid game sends another SvcServerInfo
if (!DemoInfo.HasParsedTickInterval)
{
DemoInfo.TickInterval = TickInterval;
DemoInfo.HasParsedTickInterval = true;
}
// this packet always(?) appears before the creation of any tables
DemoRef.StringTablesManager.ClearCurrentTables();
// init baselines here
DemoRef.EntBaseLines = new EntityBaseLines(DemoRef, MaxServerClasses);
}
public void Test_ByteArray()
{
BitStreamWriter writer = new BitStreamWriter(stream);
BitStreamReader reader = new BitStreamReader(stream);
byte[] array = new byte[] { 255, 254, 251, 250 };
writer.Write(array);
byte[] result = reader.ReadBytes(_fixture.index, array.Length);
_fixture.index += array.Length * 8;
Assert.Equal(array, result);
}
protected override void Parse(ref BitStreamReader bsr)
{
SignOnState = (SignOnState)bsr.ReadByte();
SpawnCount = bsr.ReadSInt();
if (DemoInfo.NewDemoProtocol)
{
NumServerPlayers = bsr.ReadUInt();
int length = (int)bsr.ReadUInt();
if (length > 0)
{
PlayerNetworkIds = bsr.ReadBytes(length);
}
length = (int)bsr.ReadUInt();
if (length > 0) // the string still seams to be null terminated (sometimes?)
{
MapName = bsr.ReadStringOfLength(length).Split(new char[] { '\0' }, 2)[0];
}
}
if (SignOnState == SignOnState.PreSpawn)
{
DemoRef.ClientSoundSequence = 1; // reset sound sequence number after receiving SignOn sounds
}
}
protected override void Parse(ref BitStreamReader bsr)
{
Arr = bsr.ReadBytes((int)bsr.ReadUInt());
}
