void ReadHeadersFrame(IChannelHandlerContext ctx, IByteBuffer payload, int payloadEndIndex, IHttp2FrameListener listener)
{
int headersStreamId = _streamId;
Http2Flags headersFlags = _flags;
int padding = ReadPadding(payload);
VerifyPadding(padding);
// The callback that is invoked is different depending on whether priority information
// is present in the headers frame.
if (headersFlags.PriorityPresent())
{
long word1 = payload.ReadUnsignedInt();
bool exclusive = (word1 & 0x80000000L) != 0;
int streamDependency = (int)(uint)(word1 & 0x7FFFFFFFL);
if (streamDependency == headersStreamId)
{
ThrowHelper.ThrowStreamError_AStreamCannotDependOnItself(headersStreamId);
}
short weight = (short)(payload.ReadByte() + 1);
int lenToRead = LengthWithoutTrailingPadding(payloadEndIndex - payload.ReaderIndex, padding);
// Create a handler that invokes the listener when the header block is complete.
_headersContinuation = new PriorityHeadersFrameHeadersContinuation(this,
ctx, headersStreamId, padding, streamDependency, weight, exclusive, headersFlags);
// Process the initial fragment, invoking the listener's callback if end of headers.
_headersContinuation.ProcessFragment(headersFlags.EndOfHeaders(), payload, lenToRead, listener);
ResetHeadersContinuationIfEnd(headersFlags.EndOfHeaders());
return;
}
// The priority fields are not present in the frame. Prepare a continuation that invokes
// the listener callback without priority information.
_headersContinuation = new HeadersFrameHeadersContinuation(this,
ctx, headersStreamId, padding, headersFlags);
// Process the initial fragment, invoking the listener's callback if end of headers.
int dataLength = LengthWithoutTrailingPadding(payloadEndIndex - payload.ReaderIndex, padding);
_headersContinuation.ProcessFragment(headersFlags.EndOfHeaders(), payload, dataLength, listener);
ResetHeadersContinuationIfEnd(headersFlags.EndOfHeaders());
}