private void WriteHeader(ref HeaderEncodingState state, string name, string value)
{
// TODO: ISSUE 31307: Use static table for known headers
int bytesWritten;
while (!HPackEncoder.EncodeHeader(name, value, _requestBuffer.AvailableSpan, out bytesWritten))
{
GrowWriteBuffer();
}
_requestBuffer.Commit(bytesWritten);
while (_requestBuffer.ActiveSpan.Slice(state.CurrentFrameOffset).Length > FrameHeader.Size + FrameHeader.MaxLength)
{
// We've exceeded the frame size limit.
// Fill in the current frame header.
WriteCurrentFrameHeader(ref state, FrameHeader.MaxLength, false);
state.IsFirstFrame = false;
state.CurrentFrameOffset += FrameHeader.Size + FrameHeader.MaxLength;
// Reserve space for new frame header
_requestBuffer.Commit(FrameHeader.Size);
Span <byte> currentFrameSpan = _requestBuffer.ActiveSpan.Slice(state.CurrentFrameOffset);
// Shift the remainder down to make room for the new frame header.
// We'll fill this in when the frame is complete.
currentFrameSpan.Slice(0, currentFrameSpan.Length - FrameHeader.Size).CopyTo(currentFrameSpan.Slice(FrameHeader.Size));
}
}
private static bool EncodeStatusHeader(int statusCode, HPackEncoder hpackEncoder, Span <byte> buffer, out int length)
{
switch (statusCode)
{
case 200:
case 204:
case 206:
case 304:
case 400:
case 404:
case 500:
// Status codes which exist in the HTTP/2 StaticTable.
return(HPackEncoder.EncodeIndexedHeaderField(H2StaticTable.GetStatusIndex(statusCode), buffer, out length));
default:
const string name = ":status";
var value = StatusCodes.ToStatusString(statusCode);
return(hpackEncoder.EncodeHeader(buffer, H2StaticTable.Status200, HeaderEncodingHint.Index, name, value, out length));
}
}
private static bool EncodeHeadersCore(HPackEncoder hpackEncoder, Http2HeadersEnumerator headersEnumerator, Span <byte> buffer, bool throwIfNoneEncoded, out int length)
{
var currentLength = 0;
do
{
var staticTableId = headersEnumerator.HPackStaticTableId;
var name = headersEnumerator.Current.Key;
var value = headersEnumerator.Current.Value;
var hint = ResolveHeaderEncodingHint(staticTableId, name);
if (!hpackEncoder.EncodeHeader(
buffer.Slice(currentLength),
staticTableId,
hint,
name,
value,
out var headerLength))
{
// If the header wasn't written, and no headers have been written, then the header is too large.
// Throw an error to avoid an infinite loop of attempting to write large header.
if (currentLength == 0 && throwIfNoneEncoded)
{
throw new HPackEncodingException(SR.net_http_hpack_encode_failure);
}
length = currentLength;
return(false);
}
currentLength += headerLength;
}while (headersEnumerator.MoveNext());
length = currentLength;
return(true);
}