public float UnpackFloat(PropertyInfo info, Bitstream stream) {
var flags = info.Flags;
if (flags.HasFlag(PropertyInfo.MultiFlag.Coord)) {
return UnpackFloatCoord(stream);
} else if (flags.HasFlag(PropertyInfo.MultiFlag.CoordMp)) {
return UnpackFloatCoordMp(stream, FloatType.None);
} else if (flags.HasFlag(PropertyInfo.MultiFlag.CoordMpLowPrecision)) {
return UnpackFloatCoordMp(stream, FloatType.LowPrecision);
} else if (flags.HasFlag(PropertyInfo.MultiFlag.CoordMpIntegral)) {
return UnpackFloatCoordMp(stream, FloatType.Integral);
} else if (flags.HasFlag(PropertyInfo.MultiFlag.NoScale)) {
return UnpackFloatNoScale(stream);
} else if (flags.HasFlag(PropertyInfo.MultiFlag.Normal)) {
return UnpackFloatNormal(stream);
} else if (flags.HasFlag(PropertyInfo.MultiFlag.CellCoord)) {
return UnpackFloatCellCoord(info, stream, FloatType.None);
} else if (flags.HasFlag(PropertyInfo.MultiFlag.CellCoordLowPrecision)) {
return UnpackFloatCellCoord(info, stream, FloatType.LowPrecision);
} else if (flags.HasFlag(PropertyInfo.MultiFlag.CellCoordIntegral)) {
return UnpackFloatCellCoord(info, stream, FloatType.Integral);
} else {
uint dividend = stream.ReadBits(info.NumBits);
uint divisor = (uint) (1 << info.NumBits) - 1;
float f = ((float) dividend) / divisor;
float range = info.HighValue - info.LowValue;
return f * range + info.LowValue;
}
}
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();
} else {
uint value = stream.ReadVarUInt();
return unchecked((uint) ((-(value & 1)) ^ (value >> 1)));
}
} else {
byte numBits = info.NumBits;
uint isUnsigned = Convert.ToUInt32(flags.HasFlag(PropertyInfo.MultiFlag.Unsigned));
uint signer = (0x80000000 >> (32 - numBits)) & unchecked((uint) (isUnsigned - 1));
uint value = stream.ReadBits(numBits) ^ signer;
return value - signer;
}
}
public void UnpackArray(uint tick, List<Property> elements, PropertyInfo info, Bitstream stream) {
byte countBits = (byte) (Util.Log2(info.NumElements + 1));
uint 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 ulong UnpackInt64(PropertyInfo info, Bitstream stream) {
if (info.Flags.HasFlag(PropertyInfo.MultiFlag.EncodedAgainstTickcount)) {
log.DebugFormat(
"{0}.{1} is encoded against tick count",
info.DtName, info.VarName);
return stream.ReadVarUInt();
} else {
bool negate = false;
byte secondBits = (byte) (info.NumBits - 32);
if (!info.Flags.HasFlag(PropertyInfo.MultiFlag.Unsigned)) {
--secondBits;
if (stream.ReadBool()) {
negate = true;
}
}
Preconditions.CheckArgument(info.NumBits >= secondBits);
ulong a = stream.ReadBits(32);
ulong b = stream.ReadBits(secondBits);
ulong value = (b << 32) | a;
if (negate) {
value = unchecked((ulong) ((long) value * -1));
}
return value;
}
}
public string UnpackString(PropertyInfo info, Bitstream stream) {
uint length = stream.ReadBits(9);
Preconditions.CheckArgument(length <= MAX_STRING_LENGTH);
byte[] buffer = new byte[length];
stream.Read(buffer, 0, (int) length);
return new String((from byte b in buffer select (char) b).ToArray<char>());
}
public VectorXy UnpackVectorXy(PropertyInfo info, Bitstream stream) {
var x = UnpackFloat(info, stream);
var y = UnpackFloat(info, stream);
return new VectorXy(x, y);
}
public Vector UnpackVector(PropertyInfo info, Bitstream stream) {
float x = UnpackFloat(info, stream);
float y = UnpackFloat(info, stream);
float z;
if (info.Flags.HasFlag(PropertyInfo.MultiFlag.Normal)) {
bool sign = stream.ReadBool();
float f = x * x + y * y;
if (1 >= f) {
z = 0;
} else {
z = (float) Math.Sqrt(1 - f);
}
if (sign) {
z *= -1;
}
} else {
z = UnpackFloat(info, stream);
}
return new Vector(x, y, z);
}
private float UnpackFloatCellCoord(PropertyInfo info, Bitstream stream, FloatType type) {
uint value = stream.ReadBits(info.NumBits);
float f = value;
if ((value >> 31) > 0) {
f *= -1;
}
if (type == FloatType.None) {
uint fraction = stream.ReadBits(5);
return f + 0.03125f * fraction;
} else if (type == FloatType.LowPrecision) {
uint fraction = stream.ReadBits(3);
return f + 0.125f * fraction;
} else if (type == FloatType.Integral) {
return f;
} else {
throw new InvalidOperationException("Unknown float type");
}
}
private string QualifyProperty(string table, PropertyInfo property) {
return String.Format("{0}.{1}", table, property.VarName);
}