private UpdateFlag ReadHeader(ref uint id, Bitstream stream)
{
var value = stream.ReadBits(6);
if ((value & 0x30) > 0)
{
var a = (value >> 4) & 3;
var b = (uint) ((a == 3) ? 16 : 0);
value = (stream.ReadBits((byte) (4*a + b)) << 4) | (value & 0xF);
}
id = unchecked(id + value + 1);
var flags = UpdateFlag.None;
if (!stream.ReadBool())
{
if (stream.ReadBool())
{
flags |= UpdateFlag.EnterPvs;
}
}
else
{
flags |= UpdateFlag.LeavePvs;
if (stream.ReadBool())
{
flags |= UpdateFlag.Delete;
}
}
return flags;
}
private void ReadChunkHeader(Bitstream stream)
{
header = new ChunkedHeader();
header.IsFile = stream.ReadBool();
if (header.IsFile)
{
var filenameLength = stream.ReadUInt32();
var filename = new byte[filenameLength + 1]; // semantically wrong. should be
// 0x104
stream.Read(filename, 0, (int) filenameLength); // and then read to end of string
filename[filenameLength] = 0; // whatever
header.Filename = Encoding.UTF8.GetString(filename);
throw new NotImplementedException();
}
header.IsCompressed = stream.ReadBool();
if (header.IsCompressed)
{
header.DecompressedLength = stream.ReadBits(26);
}
header.ByteLength = stream.ReadBits(26);
header.ChunkCount =
(header.ByteLength + DotaGameConnection.BYTES_PER_CHUNK - 1)/
DotaGameConnection.BYTES_PER_CHUNK;
Receiving = true;
dataIn = new byte[header.ByteLength];
dataReceived = new bool[header.ChunkCount];
countReceived = 0;
}
private string ReadKeyIfIncluded(Bitstream stream, List<string> keyHistory)
{
var has_key = stream.ReadBool();
if (!has_key)
{
return null;
}
var is_substring = stream.ReadBool();
string key;
if (!is_substring)
{
key = stream.ReadString();
}
else
{
var fromIndex = (int) stream.ReadBits(5);
var fromLength = (int) stream.ReadBits(5);
key = keyHistory[fromIndex].Substring(0, fromLength);
key += stream.ReadString();
}
if (keyHistory.Count == KEY_HISTORY_SIZE)
{
keyHistory.RemoveAt(0);
}
keyHistory.Add(key);
return key;
}
private Message? ReadChunk(Bitstream stream)
{
var offset = stream.ReadBits(18);
var count = stream.ReadBits(3);
if (offset == 0)
{
ReadChunkHeader(stream);
}
var byteOffset = offset*DotaGameConnection.BYTES_PER_CHUNK;
uint byteCount;
if (offset + count < header.ChunkCount)
{
byteCount = count*DotaGameConnection.BYTES_PER_CHUNK;
}
else
{
byteCount = header.ByteLength - byteOffset;
}
stream.Read(dataIn, (int) byteOffset, (int) byteCount);
for (var i = offset;
i < offset + count;
++i)
{
if (!dataReceived[i])
{
dataReceived[i] = true;
++countReceived;
}
}
if (countReceived == header.ChunkCount)
{
Receiving = false;
return new Message
{
IsCompressed = header.IsCompressed,
DecompressedLength = header.DecompressedLength,
Data = dataIn
};
}
return null;
}
public void Update(Bitstream stream, uint baseline, bool updateBaseline, uint updated, bool isDelta)
{
var id = uint.MaxValue;
uint found = 0;
while (found < updated)
{
var flags = ReadHeader(ref id, stream);
if (flags.HasFlag(UpdateFlag.EnterPvs))
{
ReadEnterPvs(id, baseline, updateBaseline, stream);
}
else if (flags.HasFlag(UpdateFlag.LeavePvs))
{
if (flags.HasFlag(UpdateFlag.Delete))
{
Delete(id);
}
}
else
{
ReadUpdate(id, stream);
}
++found;
}
if (isDelta)
{
while (stream.ReadBool())
{
id = stream.ReadBits(11);
Delete(id);
}
}
}
public uint UnpackInt(PropertyInfo info, Bitstream stream)
{
var flags = info.Flags;
if (flags.HasFlag(PropertyInfo.MultiFlag.EncodedAgainstTickcount))
{
if (flags.HasFlag(PropertyInfo.MultiFlag.Unsigned))
{
return stream.ReadVarUInt();
}
var value = stream.ReadVarUInt();
return unchecked((uint) ((-(value & 1)) ^ (value >> 1)));
}
var numBits = info.NumBits;
var isUnsigned = Convert.ToUInt32(flags.HasFlag(PropertyInfo.MultiFlag.Unsigned));
var signer = (0x80000000 >> (32 - numBits)) & unchecked((isUnsigned - 1));
{
var value = stream.ReadBits(numBits) ^ signer;
return value - signer;
}
}
public float UnpackFloat(PropertyInfo info, Bitstream stream)
{
var flags = info.Flags;
if (flags.HasFlag(PropertyInfo.MultiFlag.Coord))
{
return UnpackFloatCoord(stream);
}
if (flags.HasFlag(PropertyInfo.MultiFlag.CoordMp))
{
return UnpackFloatCoordMp(stream, FloatType.None);
}
if (flags.HasFlag(PropertyInfo.MultiFlag.CoordMpLowPrecision))
{
return UnpackFloatCoordMp(stream, FloatType.LowPrecision);
}
if (flags.HasFlag(PropertyInfo.MultiFlag.CoordMpIntegral))
{
return UnpackFloatCoordMp(stream, FloatType.Integral);
}
if (flags.HasFlag(PropertyInfo.MultiFlag.NoScale))
{
return UnpackFloatNoScale(stream);
}
if (flags.HasFlag(PropertyInfo.MultiFlag.Normal))
{
return UnpackFloatNormal(stream);
}
if (flags.HasFlag(PropertyInfo.MultiFlag.CellCoord))
{
return UnpackFloatCellCoord(info, stream, FloatType.None);
}
if (flags.HasFlag(PropertyInfo.MultiFlag.CellCoordLowPrecision))
{
return UnpackFloatCellCoord(info, stream, FloatType.LowPrecision);
}
if (flags.HasFlag(PropertyInfo.MultiFlag.CellCoordIntegral))
{
return UnpackFloatCellCoord(info, stream, FloatType.Integral);
}
var dividend = stream.ReadBits(info.NumBits);
var divisor = (uint) (1 << info.NumBits) - 1;
var f = ((float) dividend)/divisor;
var range = info.HighValue - info.LowValue;
return f*range + info.LowValue;
}
public ulong UnpackInt64(PropertyInfo info, Bitstream stream)
{
if (info.Flags.HasFlag(PropertyInfo.MultiFlag.EncodedAgainstTickcount))
{
return stream.ReadVarUInt();
}
var negate = false;
var secondBits = (byte) (info.NumBits - 32);
if (!info.Flags.HasFlag(PropertyInfo.MultiFlag.Unsigned))
{
--secondBits;
if (stream.ReadBool())
{
negate = true;
}
}
ulong a = stream.ReadBits(32);
ulong b = stream.ReadBits(secondBits);
var value = (b << 32) | a;
if (negate)
{
value = unchecked((ulong) ((long) value*-1));
}
return value;
}
public void UnpackArray(uint tick, List<Property> elements, PropertyInfo info, Bitstream stream)
{
var countBits = MiscMath.Log2(info.NumElements + 1);
var count = stream.ReadBits(countBits);
if (elements.Count > count)
{
elements.RemoveRange(0, elements.Count - (int) count);
}
else
{
while (elements.Count < count)
{
elements.Add(Property.For(info.ArrayProp));
}
}
foreach (var element in elements)
{
element.Update(tick, this, stream);
}
}
public string UnpackString(PropertyInfo info, Bitstream stream)
{
var length = stream.ReadBits(9);
var buffer = new byte[length];
stream.Read(buffer, 0, (int) length);
return new string((from byte b in buffer select (char) b).ToArray<char>());
}
private float UnpackFloatCellCoord(PropertyInfo info, Bitstream stream, FloatType type)
{
var value = stream.ReadBits(info.NumBits);
float f = value;
if ((value >> 31) > 0)
{
f *= -1;
}
if (type == FloatType.None)
{
var fraction = stream.ReadBits(5);
return f + 0.03125f*fraction;
}
if (type == FloatType.LowPrecision)
{
var fraction = stream.ReadBits(3);
return f + 0.125f*fraction;
}
if (type == FloatType.Integral)
{
return f;
}
throw new InvalidOperationException("Unknown float type");
}
private float UnpackFloatNormal(Bitstream stream)
{
var sign = stream.ReadBool();
var value = stream.ReadBits(NORMAL_FRACTIONAL_BITS);
var f = (float) (value*NORMAL_RESOLUTION);
if (sign)
{
f *= -1;
}
return f;
}
private float UnpackFloatCoord(Bitstream stream)
{
var hasInteger = stream.ReadBool();
var hasFraction = stream.ReadBool();
if (hasInteger || hasFraction)
{
var sign = stream.ReadBool();
uint integer = 0;
if (hasInteger)
{
integer = stream.ReadBits(COORD_INTEGER_BITS) + 1;
}
uint fraction = 0;
if (hasFraction)
{
fraction = stream.ReadBits(COORD_FRACTIONAL_BITS);
}
var f = (float) (integer + fraction*COORD_RESOLUTION);
if (sign)
{
f *= -1;
}
return f;
}
return 0;
}
private Message ReadSingle(Bitstream stream)
{
var isCompressed = stream.ReadBool();
if (isCompressed)
{
var uncompressed_length = stream.ReadBits(26);
var length = stream.ReadBits(18);
var data = new byte[length];
stream.Read(data, 0, (int) length);
return new Message
{
IsCompressed = false,
Data = new SnappyDecompressor().Decompress(data, 0, data.Length)
};
}
else
{
var length = stream.ReadBits(18);
var data = new byte[length];
stream.Read(data, 0, (int) length);
return new Message
{
IsCompressed = false,
Data = data
};
}
}
private void ReadEnterPvs(uint id, uint baseline, bool update_baseline, Bitstream stream)
{
var clazz = state.Classes[(int) stream.ReadBits(ClassBitLength)];
var serial = stream.ReadBits(10);
Create(id, clazz, baseline);
ReadAndUnpackFields(state.Slots[id].Entity, stream);
if (update_baseline)
{
state.Slots[id].Baselines[1 - baseline] = state.Slots[id].Entity.Copy();
}
}
private byte[] ReadValueIfIncluded(Bitstream stream, bool userDataFixedSize,
uint userDataSizeBits)
{
var has_value = stream.ReadBool();
if (!has_value)
{
return null;
}
uint length;
uint bitLength;
if (userDataFixedSize)
{
length = (userDataSizeBits + 7)/8;
bitLength = userDataSizeBits;
}
else
{
length = stream.ReadBits(14);
bitLength = 8*length;
}
return stream.ReadManyBits(bitLength);
}