/// <summary>
/// Reads a 1-bit <see cref="bool"/> without advancing the read position.
/// </summary>
public static bool PeekBool(this IBitBuffer buffer)
{
if (!buffer.HasEnoughBits(1))
{
throw new EndOfMessageException();
}
return(NetBitWriter.ReadByte(buffer.GetBuffer(), buffer.BitPosition, 1) > 0);
}
/// <summary>
/// Reads the specified number of bits into a <see cref="byte"/> without advancing the read position.
/// </summary>
public static byte PeekByte(this IBitBuffer buffer, int bitCount)
{
if (!buffer.HasEnoughBits(bitCount))
{
throw new EndOfMessageException();
}
return(NetBitWriter.ReadByte(buffer.GetBuffer(), buffer.BitPosition, bitCount));
}
public static sbyte PeekSByte(this IBitBuffer buffer)
{
if (!buffer.HasEnoughBits(8))
{
throw new EndOfMessageException();
}
return((sbyte)NetBitWriter.ReadByte(buffer.GetBuffer(), buffer.BitPosition, 8));
}
/// <summary>
/// Tries to read 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 bool TryPeekBits(this IBitBuffer buffer, Span <byte> destination, int bitCount)
{
if (!buffer.HasEnoughBits(bitCount))
{
return(false);
}
NetBitWriter.CopyBits(buffer.GetBuffer(), buffer.BitPosition, bitCount, destination, 0);
return(true);
}
/// <summary>
/// Writes a certain amount of bits from a span.
/// </summary>
/// <param name="bitOffset">The offset in bits into <paramref name="source"/>.</param>
/// <param name="bitCount">The amount of bits to copy from <paramref name="source"/>.</param>
public static void Write(this IBitBuffer buffer, ReadOnlySpan <byte> source, int bitOffset, int bitCount)
{
if (source.IsEmpty)
{
return;
}
buffer.EnsureEnoughBitCapacity(bitCount);
NetBitWriter.CopyBits(source, bitOffset, bitCount, buffer.GetBuffer(), buffer.BitPosition);
buffer.IncrementBitPosition(bitCount);
}
/// <summary>
/// Writes bytes from a span.
/// </summary>
public static void Write(this IBitBuffer buffer, ReadOnlySpan <byte> source)
{
if (!buffer.IsByteAligned())
{
buffer.Write(source, 0, source.Length * 8);
return;
}
buffer.EnsureEnoughBitCapacity(source.Length * 8);
source.CopyTo(buffer.GetBuffer().AsSpan(buffer.BytePosition));
buffer.IncrementBitPosition(source.Length * 8);
}
/// <summary>
/// Reads 1 to 8 bits into a <see cref="byte"/>.
/// </summary>
public static bool ReadByte(this IBitBuffer buffer, int bitCount, out byte result)
{
if (!buffer.HasEnoughBits(bitCount))
{
result = default;
return(false);
}
result = NetBitWriter.ReadByte(buffer.GetBuffer(), buffer.BitPosition, bitCount);
buffer.BitPosition += bitCount;
return(true);
}
/// <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);
}
/// <summary>
/// Write a <see cref="byte"/>.
/// </summary>
public static void Write(this IBitBuffer buffer, byte value)
{
buffer.EnsureEnoughBitCapacity(8);
NetBitWriter.WriteByte(value, 8, buffer.GetBuffer(), buffer.BitPosition);
buffer.IncrementBitPosition(8);
}
/// <summary>
/// Writes a <see cref="bool"/> value using 1 bit.
/// </summary>
public static void WriteBit(this IBitBuffer buffer, bool value)
{
buffer.EnsureEnoughBitCapacity(1);
NetBitWriter.WriteByte(value ? (byte)1 : (byte)0, 1, buffer.GetBuffer(), buffer.BitPosition);
buffer.IncrementBitPosition(1);
}
/// <summary>
/// Append bits from a <see cref="IBitBuffer"/> to this buffer.
/// The position and length of the source buffer are considered.
/// </summary>
public static void Write(this IBitBuffer buffer, IBitBuffer sourceBuffer)
{
int bitPosition = sourceBuffer.BitPosition;
buffer.Write(sourceBuffer.GetBuffer(), bitPosition, sourceBuffer.BitLength - bitPosition);
}
/// <summary>
/// Writes a <see cref="byte"/> using 1 to 8 bits.
/// </summary>
public static void Write(this IBitBuffer buffer, byte source, int bitCount)
{
buffer.EnsureEnoughBitCapacity(bitCount, maxBitCount: 8);
NetBitWriter.WriteByte(source, bitCount, buffer.GetBuffer(), buffer.BitPosition);
buffer.IncrementBitPosition(bitCount);
}
