/// <summary>
/// If padding is present in the payload, reads the next byte as padding. The padding also includes the one byte
/// width of the pad length field. Otherwise, returns zero.
/// </summary>
/// <param name="payload"></param>
/// <returns></returns>
int ReadPadding(IByteBuffer payload)
{
if (!_flags.PaddingPresent())
{
return(0);
}
return(payload.ReadByte() + 1);
}
public virtual Task WriteDataAsync(IChannelHandlerContext ctx, int streamId, IByteBuffer data, int padding, bool endOfStream, IPromise promise)
{
SimplePromiseAggregator promiseAggregator = new SimplePromiseAggregator(promise);
IByteBuffer frameHeader = null;
try
{
if ((uint)(streamId - 1) > SharedConstants.TooBigOrNegative)
{
ThrowHelper.ThrowArgumentException_Positive(ExceptionArgument.StreamID);
}
Http2CodecUtil.VerifyPadding(padding);
int remainingData = data.ReadableBytes;
Http2Flags flags = new Http2Flags();
_ = flags.EndOfStream(false);
_ = flags.PaddingPresent(false);
// Fast path to write frames of payload size maxFrameSize first.
if (remainingData > _maxFrameSize)
{
frameHeader = ctx.Allocator.Buffer(Http2CodecUtil.FrameHeaderLength);
Http2CodecUtil.WriteFrameHeaderInternal(frameHeader, _maxFrameSize, Http2FrameTypes.Data, flags, streamId);
do
{
// Write the header.
_ = ctx.WriteAsync(frameHeader.RetainedSlice(), promiseAggregator.NewPromise());
// Write the payload.
_ = ctx.WriteAsync(data.ReadRetainedSlice(_maxFrameSize), promiseAggregator.NewPromise());
remainingData -= _maxFrameSize;
// Stop iterating if remainingData == _maxFrameSize so we can take care of reference counts below.
}while (remainingData > _maxFrameSize);
}
if (0u >= (uint)padding)
{
// Write the header.
if (frameHeader is object)
{
_ = frameHeader.Release();
frameHeader = null;
}
IByteBuffer frameHeader2 = ctx.Allocator.Buffer(Http2CodecUtil.FrameHeaderLength);
_ = flags.EndOfStream(endOfStream);
Http2CodecUtil.WriteFrameHeaderInternal(frameHeader2, remainingData, Http2FrameTypes.Data, flags, streamId);
_ = ctx.WriteAsync(frameHeader2, promiseAggregator.NewPromise());
// Write the payload.
IByteBuffer lastFrame = data.ReadSlice(remainingData);
data = null;
_ = ctx.WriteAsync(lastFrame, promiseAggregator.NewPromise());
}
else
{
if (remainingData != _maxFrameSize)
{
if (frameHeader is object)
{
_ = frameHeader.Release();
frameHeader = null;
}
}
else
{
remainingData -= _maxFrameSize;
// Write the header.
IByteBuffer lastFrame;
if (frameHeader is null)
{
lastFrame = ctx.Allocator.Buffer(Http2CodecUtil.FrameHeaderLength);
Http2CodecUtil.WriteFrameHeaderInternal(lastFrame, _maxFrameSize, Http2FrameTypes.Data, flags, streamId);
}
else
{
lastFrame = frameHeader.Slice();
frameHeader = null;
}
_ = ctx.WriteAsync(lastFrame, promiseAggregator.NewPromise());
// Write the payload.
lastFrame = data.ReadableBytes != _maxFrameSize?data.ReadSlice(_maxFrameSize) : data;
data = null;
_ = ctx.WriteAsync(lastFrame, promiseAggregator.NewPromise());
}
do
{
int frameDataBytes = Math.Min(remainingData, _maxFrameSize);
int framePaddingBytes = Math.Min(padding, Math.Max(0, (_maxFrameSize - 1) - frameDataBytes));
// Decrement the remaining counters.
padding -= framePaddingBytes;
remainingData -= frameDataBytes;
// Write the header.
IByteBuffer frameHeader2 = ctx.Allocator.Buffer(Http2CodecUtil.DataFrameHeaderLength);
_ = flags.EndOfStream(endOfStream && 0u >= (uint)remainingData && 0u >= (uint)padding);
_ = flags.PaddingPresent(framePaddingBytes > 0);
Http2CodecUtil.WriteFrameHeaderInternal(frameHeader2, framePaddingBytes + frameDataBytes, Http2FrameTypes.Data, flags, streamId);
WritePaddingLength(frameHeader2, framePaddingBytes);
_ = ctx.WriteAsync(frameHeader2, promiseAggregator.NewPromise());
// Write the payload.
if (frameDataBytes != 0)
{
if (0u >= (uint)remainingData)
{
IByteBuffer lastFrame = data.ReadSlice(frameDataBytes);
data = null;
_ = ctx.WriteAsync(lastFrame, promiseAggregator.NewPromise());
}
else
{
_ = ctx.WriteAsync(data.ReadRetainedSlice(frameDataBytes), promiseAggregator.NewPromise());
}
}
// Write the frame padding.
if (PaddingBytes(framePaddingBytes) > 0)
{
_ = ctx.WriteAsync(
ZeroBuffer.Slice(0, PaddingBytes(framePaddingBytes)),
promiseAggregator.NewPromise());
}
}while (remainingData != 0 || padding != 0);
}
}
catch (Exception cause)
{
if (frameHeader is object)
{
_ = frameHeader.Release();
}
// Use a try/finally here in case the data has been released before calling this method. This is not
// necessary above because we internally allocate frameHeader.
try
{
if (data is object)
{
_ = data.Release();
}
}
finally
{
promiseAggregator.SetException(cause);
_ = promiseAggregator.DoneAllocatingPromises();
}
return(promiseAggregator.Task);
}
_ = promiseAggregator.DoneAllocatingPromises();
return(promiseAggregator.Task);
}