OpenSSL::Buffering#consume_rbuff

# File tmp/rubies/ruby-4.0.0/ext/openssl/lib/openssl/buffering.rb, line 87
def consume_rbuff(size=nil)
  if @rbuffer.empty?
    nil
  else
    size = @rbuffer.size unless size
    @rbuffer.slice!(0, size)
  end
end