public override object InternalExecute(Program program, object[] arguments)
{
IDataValue tempValue = arguments[0] as IDataValue;
if (tempValue == null)
{
tempValue = DataValue.FromNative(program.ValueManager, arguments[0]);
}
if (tempValue.IsPhysicalStreaming)
{
using (Stream stream = tempValue.OpenStream())
{
return((int)CRC32Utility.GetCRC32(stream));
}
}
else
{
byte[] physical = new byte[tempValue.GetPhysicalSize(true)];
tempValue.WriteToPhysical(physical, 0, true);
return((int)CRC32Utility.GetCRC32(physical));
}
}
private IDataValue _writeValue; // saves the row instantiated to write the compound value if this is a compound scalar
public override int GetPhysicalSize(bool expandStreams)
{
int size = 1; // Scalar header
if (!IsNil)
{
if (IsNative)
{
if (DataType.IsCompound)
{
_writeValue = DataValue.FromNative(Manager, DataType.CompoundRowType, Value);
return(size + _writeValue.GetPhysicalSize(expandStreams));
}
else
{
Streams.IConveyor conveyor = Manager.GetConveyor(DataType);
if (conveyor.IsStreaming)
{
_writeStream = new MemoryStream(64);
conveyor.Write(Value, _writeStream);
return(size + (int)_writeStream.Length);
}
return(size + conveyor.GetSize(Value));
}
}
if (expandStreams)
{
_writeStream = Manager.StreamManager.Open(StreamID, LockMode.Exclusive);
return(size + (int)_writeStream.Length);
}
return(size + StreamID.CSizeOf);
}
return(size);
}