/// <summary>
/// Masks bits from the source based on the given count and <see cref="CurrentByteOffset"/> and adds them to the container.
/// </summary>
/// <param name="container">The container to move bits into.</param>
/// <param name="source">The source byte containing the bits to copy.</param>
/// <param name="bitCount">The number of bits to copy.</param>
protected virtual void MaskAndCopyBits(ref TBitContainer container, byte source, int bitCount)
{
var mask = BitHelpers.GetLeftMaskByte(bitCount) >> CurrentByteOffset;
var bits = (byte)((source & mask) >> (BitsInByte - bitCount - CurrentByteOffset));
Enumerable.AddToContainer(ref container, bits, bitCount);
}