/// <summary>Decode the next token from a packed tuple</summary>
/// <param name="reader">Parser from wich to read the next token</param>
/// <returns>Token decoded, or Slice.Nil if there was no more data in the buffer</returns>
public static Slice ParseNext(ref SliceReader reader)
{
int type = reader.PeekByte();
switch (type)
{
case -1:
{ // End of Stream
return(Slice.Nil);
}
case FdbTupleTypes.Nil:
{ // <00> => null
reader.Skip(1);
return(Slice.Empty);
}
case FdbTupleTypes.Bytes:
{ // <01>(bytes)<00>
return(reader.ReadByteString());
}
case FdbTupleTypes.Utf8:
{ // <02>(utf8 bytes)<00>
return(reader.ReadByteString());
}
case FdbTupleTypes.Single:
{ // <20>(4 bytes)
return(reader.ReadBytes(5));
}
case FdbTupleTypes.Double:
{ // <21>(8 bytes)
return(reader.ReadBytes(9));
}
case FdbTupleTypes.Uuid128:
{ // <30>(16 bytes)
return(reader.ReadBytes(17));
}
case FdbTupleTypes.Uuid64:
{ // <31>(8 bytes)
return(reader.ReadBytes(9));
}
case FdbTupleTypes.AliasDirectory:
case FdbTupleTypes.AliasSystem:
{ // <FE> or <FF>
return(reader.ReadBytes(1));
}
}
if (type <= FdbTupleTypes.IntPos8 && type >= FdbTupleTypes.IntNeg8)
{
int bytes = type - FdbTupleTypes.IntZero;
if (bytes < 0)
{
bytes = -bytes;
}
return(reader.ReadBytes(1 + bytes));
}
throw new FormatException(String.Format("Invalid tuple type byte {0} at index {1}/{2}", type, reader.Position, reader.Buffer.Count));
}