/// <summary>
/// Reads the specified number of bits,
/// between one and <paramref name="maxBitCount"/>,
/// without advancing the read position.
/// </summary>
/// <param name="destination">The destination span.</param>
/// <param name="bitCount">The number of bits to read.</param>
/// <param name="maxBitCount">The maximum amount of bits to read.</param>
public static void PeekBits(this IBitBuffer buffer, Span <byte> destination, int bitCount, int maxBitCount)
{
Debug.Assert(bitCount >= 1);
Debug.Assert(bitCount <= maxBitCount);
buffer.TryPeekBits(destination, bitCount);
}
/// <summary>
/// Reads the specified number of bits without advancing the read position.
/// </summary>
/// <param name="destination">The destination span.</param>
/// <param name="bitCount">The number of bits to read.</param>
public static void Peek(this IBitBuffer buffer, Span <byte> destination, int bitCount)
{
if (!buffer.TryPeekBits(destination, bitCount))
{
throw new EndOfMessageException();
}
}
/// <summary>
/// Tries to read the specified number of bytes without advancing the read position.
/// </summary>
/// <param name="destination">The destination span.</param>
public static bool TryPeek(this IBitBuffer buffer, Span <byte> destination)
{
if (!buffer.IsByteAligned())
{
return(buffer.TryPeekBits(destination, destination.Length * 8));
}
if (!buffer.HasEnoughBits(destination.Length))
{
return(false);
}
buffer.GetBuffer().AsSpan(buffer.BytePosition, destination.Length).CopyTo(destination);
return(true);
}