if d.saveBuf.Len() == 0 {
		d.buf = p
	} else {
		d.saveBuf.Write(p)
		d.buf = d.saveBuf.Bytes()
		d.saveBuf.Reset()
	}

	for len(d.buf) > 0 {
		err = d.parseHeaderFieldRepr()
		if err == errNeedMore {
			// Extra paranoia, making sure saveBuf won't
			// get too large. All the varint and string
			// reading code earlier should already catch