Method write_count

src/common/MemoryStreams.hpp:157–159

	size_t read_count() const { return write_pos < impl.size() ? write_pos - read_pos : impl.size() - read_pos; }
	const unsigned char *read_ptr() const { return impl.data() + read_pos; }
	size_t write_count() const {
		return write_pos < impl.size() ? impl.size() - write_pos : read_pos - (write_pos - impl.size());
	}
	unsigned char *write_ptr() {
		return write_pos < impl.size() ? impl.data() + write_pos : impl.data() + write_pos - impl.size();
	}