Function parseDataFrame

internal/http2/frame.go:655–687

(fc *frameCache, fh FrameHeader, countError func(string), payload []byte)

}

func parseDataFrame(fc *frameCache, fh FrameHeader, countError func(string), payload []byte) (Frame, error) {
	if fh.StreamID == 0 {
		// DATA frames MUST be associated with a stream. If a
		// DATA frame is received whose stream identifier
		// field is 0x0, the recipient MUST respond with a
		// connection error (Section 5.4.1) of type
		// PROTOCOL_ERROR.
		countError("frame_data_stream_0")
		return nil, connError{ErrCodeProtocol, "DATA frame with stream ID 0"}
	}
	f := fc.getDataFrame()
	f.FrameHeader = fh

	var padSize byte
	if fh.Flags.Has(FlagDataPadded) {
		var err error
		payload, padSize, err = readByte(payload)
		if err != nil {
			countError("frame_data_pad_byte_short")
			return nil, err
		}
	}
	if int(padSize) > len(payload) {
		// If the length of the padding is greater than the
		// length of the frame payload, the recipient MUST
		// treat this as a connection error.
		// Filed: https://github.com/http2/http2-spec/issues/610
		countError("frame_data_pad_too_big")
		return nil, connError{ErrCodeProtocol, "pad size larger than data payload"}
	}
	f.data = payload[:len(payload)-int(padSize)]
	return f, nil
}

var (
	errStreamID    = errors.New("invalid stream ID")