static RawVariantLength RawLengthFromByte(byte length)
{
Contract.Requires(length > 0 && length <= 4);
RawVariantLength l = (RawVariantLength)(--length);
return(l);
}
static void SetLength(RawVariantLength length, ref uint data)
{
uint l = (uint)length;
l <<= kInfoLengthBitIndex;
l &= kInfoLengthBitMask;
data |= l;
}
static byte RawLengthToByte(RawVariantLength length)
{
const byte k_rebase = 1;
byte l = (byte)length;
l += k_rebase;
return(l);
}
static void Decompose(XmbVariant v,
out RawVariantType t, out RawVariantLength l, out RawVariantFlags f, out uint data)
{
t = RawVariantType.Null;
l = (RawVariantLength)byte.MinValue;
f = (RawVariantFlags)byte.MinValue;
data = 0;
bool is_indirect = v.IsIndirect;
bool is_unsigned = v.Type == XmbVariantType.Int && v.IsUnsigned;
switch (v.Type)
{
case XmbVariantType.Single:
DecomposeSingle(v, out t, out data);
break;
case XmbVariantType.Int:
DecomposeInt(v, out t, ref f, out data);
break;
case XmbVariantType.Double: // double is always indirect
t = RawVariantType.Double;
break;
case XmbVariantType.Bool:
t = RawVariantType.Bool;
data = v.Bool ? 1U : 0U;
break;
case XmbVariantType.String:
t = v.IsUnicode ? RawVariantType.StringUnicode : RawVariantType.StringAnsi;
StringFromVariant(v, ref data);
break;
case XmbVariantType.Vector: // Vector is always indirect
t = RawVariantType.Vector;
l = RawLengthFromByte(v.VectorLength);
break;
}
if (is_indirect)
{
data = v.Offset & kValueBitMask;
}
}
static void Compose(out XmbVariant v, uint data)
{
v = XmbVariant.Empty;
RawVariantType type = GetType(data);
RawVariantLength length = GetLength(data);
RawVariantFlags flags = GetFlags(data);
// Get the actual data value
data &= kValueBitMask;
switch (type)
{
#region Single
case RawVariantType.Single24:
v.Type = XmbVariantType.Single;
v.Single = Bitwise.Single24.ToSingle(data);
break;
case RawVariantType.Single:
v.Type = XmbVariantType.Single;
v.IsIndirect = (flags & RawVariantFlags.Offset) != 0; // should always be true
v.Offset = data;
break;
case RawVariantType.FixedPoint:
v.Type = XmbVariantType.Single;
v.Single = SingleFixedPoint.ToSingle(data);
break;
#endregion
#region Int
case RawVariantType.Int24:
Int24ToVariant(ref v, flags, data);
break;
case RawVariantType.Int:
v.Type = XmbVariantType.Int;
v.IsUnsigned = (flags & RawVariantFlags.Unsigned) != 0;
v.IsIndirect = (flags & RawVariantFlags.Offset) != 0; // should always be true
v.Offset = data;
break;
#endregion
#region Double
case RawVariantType.Double:
v.Type = XmbVariantType.Double;
v.IsIndirect = (flags & RawVariantFlags.Offset) != 0; // should always be true
v.Offset = data;
break;
#endregion
#region Bool
case RawVariantType.Bool:
v.Type = XmbVariantType.Bool;
v.Bool = data != 0;
break;
#endregion
#region String
case RawVariantType.StringAnsi:
v.Type = XmbVariantType.String;
v.IsIndirect = (flags & RawVariantFlags.Offset) != 0;
v.IsUnicode = false;
break;
case RawVariantType.StringUnicode:
v.Type = XmbVariantType.String;
v.IsIndirect = (flags & RawVariantFlags.Offset) != 0;
v.IsUnicode = true;
break;
#endregion
#region Vector
case RawVariantType.Vector:
v.Type = XmbVariantType.Vector;
v.VectorLength = RawLengthToByte(length);
v.IsIndirect = (flags & RawVariantFlags.Offset) != 0; // should always be true
v.Offset = data;
break;
#endregion
}
if (v.Type == XmbVariantType.String)
{
StringToVariant(ref v, data);
}
}
