public static bool ReadFrame(ReadOnlyBuffer <byte> readableBuffer, Http2Frame frame, out SequencePosition consumed, out SequencePosition examined)
{
consumed = readableBuffer.Start;
examined = readableBuffer.End;
if (readableBuffer.Length < Http2Frame.HeaderLength)
{
return(false);
}
var headerSlice = readableBuffer.Slice(0, Http2Frame.HeaderLength);
headerSlice.CopyTo(frame.Raw);
if (readableBuffer.Length < Http2Frame.HeaderLength + frame.Length)
{
return(false);
}
readableBuffer.Slice(Http2Frame.HeaderLength, frame.Length).CopyTo(frame.Payload);
consumed = examined = readableBuffer.GetPosition(readableBuffer.Start, Http2Frame.HeaderLength + frame.Length);
return(true);
}
public void ParseFrame(Http2Frame frame)
{
var settingsCount = frame.Length / 6;
for (var i = 0; i < settingsCount; i++)
{
var offset = i * 6;
var id = (Http2SettingsParameter)((frame.Payload[offset] << 8) | frame.Payload[offset + 1]);
var value = (uint)((frame.Payload[offset + 2] << 24)
| (frame.Payload[offset + 3] << 16)
| (frame.Payload[offset + 4] << 8)
| frame.Payload[offset + 5]);
switch (id)
{
case Http2SettingsParameter.SETTINGS_HEADER_TABLE_SIZE:
HeaderTableSize = value;
break;
case Http2SettingsParameter.SETTINGS_ENABLE_PUSH:
if (value != 0 && value != 1)
{
throw new Http2SettingsParameterOutOfRangeException(Http2SettingsParameter.SETTINGS_ENABLE_PUSH,
lowerBound: 0,
upperBound: 1);
}
EnablePush = value == 1;
break;
case Http2SettingsParameter.SETTINGS_MAX_CONCURRENT_STREAMS:
MaxConcurrentStreams = value;
break;
case Http2SettingsParameter.SETTINGS_INITIAL_WINDOW_SIZE:
if (value > int.MaxValue)
{
throw new Http2SettingsParameterOutOfRangeException(Http2SettingsParameter.SETTINGS_INITIAL_WINDOW_SIZE,
lowerBound: 0,
upperBound: int.MaxValue);
}
InitialWindowSize = value;
break;
case Http2SettingsParameter.SETTINGS_MAX_FRAME_SIZE:
if (value < Http2Frame.MinAllowedMaxFrameSize || value > Http2Frame.MaxAllowedMaxFrameSize)
{
throw new Http2SettingsParameterOutOfRangeException(Http2SettingsParameter.SETTINGS_MAX_FRAME_SIZE,
lowerBound: Http2Frame.MinAllowedMaxFrameSize,
upperBound: Http2Frame.MaxAllowedMaxFrameSize);
}
MaxFrameSize = value;
break;
case Http2SettingsParameter.SETTINGS_MAX_HEADER_LIST_SIZE:
MaxHeaderListSize = value;
break;
default:
// http://httpwg.org/specs/rfc7540.html#rfc.section.6.5.2
//
// An endpoint that receives a SETTINGS frame with any unknown or unsupported identifier MUST ignore that setting.
break;
}
}
}