public static byte[] GetSmallestBytes(this PrimPar type, int value)
{
byte[] bytes;
if (value < 32 && value >= -32)
{
bytes = new byte[1];
bytes[0] = type.BitwiseOr(PrimPar.Short.BitwiseOr(PrimPar.Value.BitwiseAnd((byte)value)));
}
else if (value < sbyte.MaxValue && value > sbyte.MinValue)
{
bytes = new byte[2];
bytes[0] = type.BitwiseOr(PrimPar.Long).BitwiseOr(PrimPar.OneByte).AsByte();
bytes[1] = (byte)(value & 0xFF);
}
else if (value < short.MaxValue && value > short.MinValue)
{
bytes = new byte[3];
bytes[0] = type.BitwiseOr(PrimPar.Long).BitwiseOr(PrimPar.TwoBytes).AsByte();
bytes[1] = (byte)(value & 0xFF);
bytes[2] = (byte)((value >> 8) & 0xFF);
}
else
{
bytes = new byte[5];
bytes[0] = type.BitwiseOr(PrimPar.Long).BitwiseOr(PrimPar.FourBytes).AsByte();
bytes[1] = (byte)(value & 0xFF);
bytes[2] = (byte)((value >> 8) & 0xFF);
bytes[3] = (byte)((value >> 16) & 0xFF);
bytes[4] = (byte)((value >> 24) & 0xFF);
}
return(bytes);
}
internal Variable(PrimPar primParVariableType, int size, ref int offset)
{
if (primParVariableType != PrimPar.Local && primParVariableType != PrimPar.Global)
{
throw new ArgumentOutOfRangeException("Must be local or global", nameof(primParVariableType));
}
if (size < 0)
{
throw new ArgumentOutOfRangeException("Cannot be < 0", nameof(size));
}
// We can check the size of value types. If T is not a value type, assume it is variable sized.
if (typeof(T).GetTypeInfo().IsValueType)
{
var expectedSize = Marshal.SizeOf <T>();
if (size != expectedSize)
{
throw new ArgumentOutOfRangeException($"Must be exactly {expectedSize}", nameof(size));
}
}
this.primParVariableType = primParVariableType;
this.size = size;
offset = AlignIfNeeded(size, offset);
this.offset = offset;
bytes = PrimPar.Variable.BitwiseOr(primParVariableType).GetSmallestBytes(offset);
offset += size;
}
public static byte AsByte(this PrimPar primPar)
{
return((byte)primPar);
}
public static PrimPar BitwiseOr(this PrimPar primPar, PrimPar value)
{
return((PrimPar)(primPar.AsByte() | (byte)value));
}
public static byte BitwiseAnd(this PrimPar primPar, byte value)
{
return((byte)(primPar.AsByte() & value));
}
