/// <summary>
/// Converts the members of the bit field to an integer value.
/// </summary>
/// <param name="obj">An instance of a struct that implements the interface IBitField.</param>
/// <returns>An integer representation of the bit field.</returns>
public static ulong ToUInt64(this IBitField obj)
{
ulong result = 0;
// Loop through all the properties
foreach (PropertyInfo pi in obj.GetType().GetProperties())
{
// Check if the property has an attribute of type BitFieldLengthAttribute
BitFieldInfoAttribute bitField = (pi.GetCustomAttribute(typeof(BitFieldInfoAttribute)) as BitFieldInfoAttribute);
if (bitField != null)
{
// Calculate a bitmask using the length of the bit field
ulong mask = 0;
for (byte i = 0; i < bitField.Length; i++)
{
mask |= 1UL << i;
}
// This conversion makes it possible to use different types in the bit field
ulong value = Convert.ToUInt64(pi.GetValue(obj));
result |= (value & mask) << bitField.Offset;
}
}
return(result);
}
/// <summary>
/// Creates a new instance of the provided struct.
/// </summary>
/// <typeparam name="T">The type of the struct that is to be created.</typeparam>
/// <param name="value">The initial value of the struct.</param>
/// <returns>The instance of the new struct.</returns>
public static T CreateBitField <T>(ulong value) where T : struct
{
// The created struct has to be boxed, otherwise PropertyInfo.SetValue
// will work on a copy instead of the actual object
object boxedValue = new T();
// Loop through the properties and set a value to each one
foreach (PropertyInfo pi in boxedValue.GetType().GetProperties())
{
BitFieldInfoAttribute bitField = (pi.GetCustomAttribute(typeof(BitFieldInfoAttribute)) as BitFieldInfoAttribute);
if (bitField != null)
{
ulong mask = (ulong)Math.Pow(2, bitField.Length) - 1;
object setVal = Convert.ChangeType((value >> bitField.Offset) & mask, pi.PropertyType);
pi.SetValue(boxedValue, setVal);
}
}
// Unboxing the object
return((T)boxedValue);
}
