private void Deflate()
{
Debug.Assert(m_current.Position > 0);
if (m_completedLast == null)
{
m_completedLast = new BufferSequenceSegment(WebSocketBase.Memory.Rent(WebSocketBase.DefaultSegmentSize), WebSocketBase.MaxHeaderSize);
m_completedFirst = m_completedLast;
}
var compressableBytes = m_current.WrittenMemory.Span;
while (compressableBytes.Length > 0)
{
if (m_completedLast.Available == 0)
{
m_completedLast = m_completedLast.Append(WebSocketBase.Memory.Rent(WebSocketBase.DefaultSegmentSize), 0);
}
m_deflater.Deflate(compressableBytes, m_completedLast.AvailableMemory.Span, out var consumed, out var written);
m_completedLast.Advance(written);
compressableBytes = compressableBytes.Slice(consumed);
}
// Move the current buffer to the start position
m_current.Advance(-m_current.Position);
}
private void Inflate()
{
if (m_inflater == null)
{
throw new WebSocketException("Message compression is not enabled.");
}
Debug.Assert(m_current.Position > 0);
if (m_completed == null)
{
m_completed = new BufferSequenceSegment(WebSocketBase.Memory.Rent(WebSocketBase.DefaultSegmentSize), 0);
}
var inflatableBytes = m_current.WrittenMemory.Span;
while (inflatableBytes.Length > 0)
{
if (m_completed.Available == 0)
{
m_completed = m_completed.Append(WebSocketBase.Memory.Rent(WebSocketBase.DefaultSegmentSize), 0);
}
m_inflater.Inflate(inflatableBytes, m_completed.AvailableMemory.Span, out var consumed, out var written);
Length += written;
m_completed.Advance(written);
inflatableBytes = inflatableBytes.Slice(consumed);
}
// Reset the current buffer to the beginning. All bytes have been consumed (inflated).
m_current.Advance(-m_current.Position);
}
internal WebSocketMessage ToMessage(WebSocketMessageType messageType, WebSocketBase socket)
{
if (m_current.Position > 0)
{
if (m_deflater != null)
{
Deflate();
m_current.Reset();
}
else
{
// No compression, just append the block for sending
m_current.AppendTo(ref m_completedLast);
if (m_completedFirst == null)
{
m_completedFirst = m_completedLast;
}
}
}
if (m_deflater != null && m_completedLast != null)
{
FinishDeflater();
}
var offset = 0;
var compressed = m_completedLast != null && m_deflater != null;
if (socket.Native)
{
if (m_completedLast == null)
{
// The send procedure requires at least the message header
m_completedLast = new BufferSequenceSegment(WebSocketBase.Memory.Rent(WebSocketBase.MaxHeaderSize), WebSocketBase.MaxHeaderSize);
m_completedFirst = m_completedLast;
}
offset = WriteHeader(messageType, compressed, socket.IsServer());
if (!socket.IsServer())
{
ApplyMask();
}
}
var message = m_completedFirst == null ? (WebSocketMessage) new WebSocketControlMessage(messageType, Array.Empty <Byte>()) :
new WebSocketDataMessage(messageType, m_completedFirst, offset, compressed);
m_completedFirst = null;
m_completedLast = null;
return(message);
}
public WebSocketDataMessage(WebSocketMessageType type, BufferSequenceSegment start, Int32 startIndex, Boolean compressed)
{
Debug.Assert(start != null);
m_next = start;
m_nextStartIndex = startIndex;
Type = type;
Length = (Int32)Buffer.Length;
Compressed = compressed;
}
public Segment Add(BufferSequenceSegment buffer)
{
var segment = new Segment(buffer, 0)
{
RunningIndex = RunningIndex + Memory.Length
};
Next = segment;
if (buffer.Next == null)
{
return(segment);
}
return(segment.Add(buffer.Next));
}
public Segment(BufferSequenceSegment start, Int32 startIndex)
{
Memory = start.WrittenMemory.Slice(startIndex);
}